C is gone. All tests pass.

api.c

@@ -1,1392 +0,0 @@
-
-#include "yaml_private.h"
-
-/*
- * Get the library version.
- */
-
-YAML_DECLARE(const char *)
-yaml_get_version_string(void)
-{
-    return YAML_VERSION_STRING;
-}
-
-/*
- * Get the library version numbers.
- */
-
-YAML_DECLARE(void)
-yaml_get_version(int *major, int *minor, int *patch)
-{
-    *major = YAML_VERSION_MAJOR;
-    *minor = YAML_VERSION_MINOR;
-    *patch = YAML_VERSION_PATCH;
-}
-
-/*
- * Allocate a dynamic memory block.
- */
-
-YAML_DECLARE(void *)
-yaml_malloc(size_t size)
-{
-    return malloc(size ? size : 1);
-}
-
-/*
- * Reallocate a dynamic memory block.
- */
-
-YAML_DECLARE(void *)
-yaml_realloc(void *ptr, size_t size)
-{
-    return ptr ? realloc(ptr, size ? size : 1) : malloc(size ? size : 1);
-}
-
-/*
- * Free a dynamic memory block.
- */
-
-YAML_DECLARE(void)
-yaml_free(void *ptr)
-{
-    if (ptr) free(ptr);
-}
-
-/*
- * Duplicate a string.
- */
-
-YAML_DECLARE(yaml_char_t *)
-yaml_strdup(const yaml_char_t *str)
-{
-    if (!str)
-        return NULL;
-
-    return (yaml_char_t *)strdup((char *)str);
-}
-
-/*
- * Extend a string.
- */
-
-YAML_DECLARE(int)
-yaml_string_extend(yaml_char_t **start,
-        yaml_char_t **pointer, yaml_char_t **end)
-{
-    yaml_char_t *new_start = yaml_realloc(*start, (*end - *start)*2);
-
-    if (!new_start) return 0;
-
-    memset(new_start + (*end - *start), 0, *end - *start);
-
-    *pointer = new_start + (*pointer - *start);
-    *end = new_start + (*end - *start)*2;
-    *start = new_start;
-
-    return 1;
-}
-
-/*
- * Append a string B to a string A.
- */
-
-YAML_DECLARE(int)
-yaml_string_join(
-        yaml_char_t **a_start, yaml_char_t **a_pointer, yaml_char_t **a_end,
-        yaml_char_t **b_start, yaml_char_t **b_pointer, yaml_char_t **b_end)
-{
-    if (*b_start == *b_pointer)
-        return 1;
-
-    while (*a_end - *a_pointer <= *b_pointer - *b_start) {
-        if (!yaml_string_extend(a_start, a_pointer, a_end))
-            return 0;
-    }
-
-    memcpy(*a_pointer, *b_start, *b_pointer - *b_start);
-    *a_pointer += *b_pointer - *b_start;
-
-    return 1;
-}
-
-/*
- * Extend a stack.
- */
-
-YAML_DECLARE(int)
-yaml_stack_extend(void **start, void **top, void **end)
-{
-    void *new_start = yaml_realloc(*start, ((char *)*end - (char *)*start)*2);
-
-    if (!new_start) return 0;
-
-    *top = (char *)new_start + ((char *)*top - (char *)*start);
-    *end = (char *)new_start + ((char *)*end - (char *)*start)*2;
-    *start = new_start;
-
-    return 1;
-}
-
-/*
- * Extend or move a queue.
- */
-
-YAML_DECLARE(int)
-yaml_queue_extend(void **start, void **head, void **tail, void **end)
-{
-    /* Check if we need to resize the queue. */
-
-    if (*start == *head && *tail == *end) {
-        void *new_start = yaml_realloc(*start,
-                ((char *)*end - (char *)*start)*2);
-
-        if (!new_start) return 0;
-
-        *head = (char *)new_start + ((char *)*head - (char *)*start);
-        *tail = (char *)new_start + ((char *)*tail - (char *)*start);
-        *end = (char *)new_start + ((char *)*end - (char *)*start)*2;
-        *start = new_start;
-    }
-
-    /* Check if we need to move the queue at the beginning of the buffer. */
-
-    if (*tail == *end) {
-        if (*head != *tail) {
-            memmove(*start, *head, (char *)*tail - (char *)*head);
-        }
-        *tail = (char *)*tail - (char *)*head + (char *)*start;
-        *head = *start;
-    }
-
-    return 1;
-}
-
-
-/*
- * Create a new parser object.
- */
-
-YAML_DECLARE(int)
-yaml_parser_initialize(yaml_parser_t *parser)
-{
-    assert(parser);     /* Non-NULL parser object expected. */
-
-    memset(parser, 0, sizeof(yaml_parser_t));
-    if (!BUFFER_INIT(parser, parser->raw_buffer, INPUT_RAW_BUFFER_SIZE))
-        goto error;
-    if (!BUFFER_INIT(parser, parser->buffer, INPUT_BUFFER_SIZE))
-        goto error;
-    if (!QUEUE_INIT(parser, parser->tokens, INITIAL_QUEUE_SIZE))
-        goto error;
-    if (!STACK_INIT(parser, parser->indents, INITIAL_STACK_SIZE))
-        goto error;
-    if (!STACK_INIT(parser, parser->simple_keys, INITIAL_STACK_SIZE))
-        goto error;
-    if (!STACK_INIT(parser, parser->states, INITIAL_STACK_SIZE))
-        goto error;
-    if (!STACK_INIT(parser, parser->marks, INITIAL_STACK_SIZE))
-        goto error;
-    if (!STACK_INIT(parser, parser->tag_directives, INITIAL_STACK_SIZE))
-        goto error;
-
-    return 1;
-
-error:
-
-    BUFFER_DEL(parser, parser->raw_buffer);
-    BUFFER_DEL(parser, parser->buffer);
-    QUEUE_DEL(parser, parser->tokens);
-    STACK_DEL(parser, parser->indents);
-    STACK_DEL(parser, parser->simple_keys);
-    STACK_DEL(parser, parser->states);
-    STACK_DEL(parser, parser->marks);
-    STACK_DEL(parser, parser->tag_directives);
-
-    return 0;
-}
-
-/*
- * Destroy a parser object.
- */
-
-YAML_DECLARE(void)
-yaml_parser_delete(yaml_parser_t *parser)
-{
-    assert(parser); /* Non-NULL parser object expected. */
-
-    BUFFER_DEL(parser, parser->raw_buffer);
-    BUFFER_DEL(parser, parser->buffer);
-    while (!QUEUE_EMPTY(parser, parser->tokens)) {
-        yaml_token_delete(&DEQUEUE(parser, parser->tokens));
-    }
-    QUEUE_DEL(parser, parser->tokens);
-    STACK_DEL(parser, parser->indents);
-    STACK_DEL(parser, parser->simple_keys);
-    STACK_DEL(parser, parser->states);
-    STACK_DEL(parser, parser->marks);
-    while (!STACK_EMPTY(parser, parser->tag_directives)) {
-        yaml_tag_directive_t tag_directive = POP(parser, parser->tag_directives);
-        yaml_free(tag_directive.handle);
-        yaml_free(tag_directive.prefix);
-    }
-    STACK_DEL(parser, parser->tag_directives);
-
-    memset(parser, 0, sizeof(yaml_parser_t));
-}
-
-/*
- * String read handler.
- */
-
-static int
-yaml_string_read_handler(void *data, unsigned char *buffer, size_t size,
-        size_t *size_read)
-{
-    yaml_parser_t *parser = data;
-
-    if (parser->input.string.current == parser->input.string.end) {
-        *size_read = 0;
-        return 1;
-    }
-
-    if (size > (size_t)(parser->input.string.end
-                - parser->input.string.current)) {
-        size = parser->input.string.end - parser->input.string.current;
-    }
-
-    memcpy(buffer, parser->input.string.current, size);
-    parser->input.string.current += size;
-    *size_read = size;
-    return 1;
-}
-
-/*
- * File read handler.
- */
-
-static int
-yaml_file_read_handler(void *data, unsigned char *buffer, size_t size,
-        size_t *size_read)
-{
-    yaml_parser_t *parser = data;
-
-    *size_read = fread(buffer, 1, size, parser->input.file);
-    return !ferror(parser->input.file);
-}
-
-/*
- * Set a string input.
- */
-
-YAML_DECLARE(void)
-yaml_parser_set_input_string(yaml_parser_t *parser,
-        const unsigned char *input, size_t size)
-{
-    assert(parser); /* Non-NULL parser object expected. */
-    assert(!parser->read_handler);  /* You can set the source only once. */
-    assert(input);  /* Non-NULL input string expected. */
-
-    parser->read_handler = yaml_string_read_handler;
-    parser->read_handler_data = parser;
-
-    parser->input.string.start = input;
-    parser->input.string.current = input;
-    parser->input.string.end = input+size;
-}
-
-/*
- * Set a file input.
- */
-
-YAML_DECLARE(void)
-yaml_parser_set_input_file(yaml_parser_t *parser, FILE *file)
-{
-    assert(parser); /* Non-NULL parser object expected. */
-    assert(!parser->read_handler);  /* You can set the source only once. */
-    assert(file);   /* Non-NULL file object expected. */
-
-    parser->read_handler = yaml_file_read_handler;
-    parser->read_handler_data = parser;
-
-    parser->input.file = file;
-}
-
-/*
- * Set a generic input.
- */
-
-YAML_DECLARE(void)
-yaml_parser_set_input(yaml_parser_t *parser,
-        yaml_read_handler_t *handler, void *data)
-{
-    assert(parser); /* Non-NULL parser object expected. */
-    assert(!parser->read_handler);  /* You can set the source only once. */
-    assert(handler);    /* Non-NULL read handler expected. */
-
-    parser->read_handler = handler;
-    parser->read_handler_data = data;
-}
-
-/*
- * Set the source encoding.
- */
-
-YAML_DECLARE(void)
-yaml_parser_set_encoding(yaml_parser_t *parser, yaml_encoding_t encoding)
-{
-    assert(parser); /* Non-NULL parser object expected. */
-    assert(!parser->encoding); /* Encoding is already set or detected. */
-
-    parser->encoding = encoding;
-}
-
-/*
- * Create a new emitter object.
- */
-
-YAML_DECLARE(int)
-yaml_emitter_initialize(yaml_emitter_t *emitter)
-{
-    assert(emitter);    /* Non-NULL emitter object expected. */
-
-    memset(emitter, 0, sizeof(yaml_emitter_t));
-    if (!BUFFER_INIT(emitter, emitter->buffer, OUTPUT_BUFFER_SIZE))
-        goto error;
-    if (!BUFFER_INIT(emitter, emitter->raw_buffer, OUTPUT_RAW_BUFFER_SIZE))
-        goto error;
-    if (!STACK_INIT(emitter, emitter->states, INITIAL_STACK_SIZE))
-        goto error;
-    if (!QUEUE_INIT(emitter, emitter->events, INITIAL_QUEUE_SIZE))
-        goto error;
-    if (!STACK_INIT(emitter, emitter->indents, INITIAL_STACK_SIZE))
-        goto error;
-    if (!STACK_INIT(emitter, emitter->tag_directives, INITIAL_STACK_SIZE))
-        goto error;
-
-    return 1;
-
-error:
-
-    BUFFER_DEL(emitter, emitter->buffer);
-    BUFFER_DEL(emitter, emitter->raw_buffer);
-    STACK_DEL(emitter, emitter->states);
-    QUEUE_DEL(emitter, emitter->events);
-    STACK_DEL(emitter, emitter->indents);
-    STACK_DEL(emitter, emitter->tag_directives);
-
-    return 0;
-}
-
-/*
- * Destroy an emitter object.
- */
-
-YAML_DECLARE(void)
-yaml_emitter_delete(yaml_emitter_t *emitter)
-{
-    assert(emitter);    /* Non-NULL emitter object expected. */
-
-    BUFFER_DEL(emitter, emitter->buffer);
-    BUFFER_DEL(emitter, emitter->raw_buffer);
-    STACK_DEL(emitter, emitter->states);
-    while (!QUEUE_EMPTY(emitter, emitter->events)) {
-        yaml_event_delete(&DEQUEUE(emitter, emitter->events));
-    }
-    QUEUE_DEL(emitter, emitter->events);
-    STACK_DEL(emitter, emitter->indents);
-    while (!STACK_EMPTY(empty, emitter->tag_directives)) {
-        yaml_tag_directive_t tag_directive = POP(emitter, emitter->tag_directives);
-        yaml_free(tag_directive.handle);
-        yaml_free(tag_directive.prefix);
-    }
-    STACK_DEL(emitter, emitter->tag_directives);
-    yaml_free(emitter->anchors);
-
-    memset(emitter, 0, sizeof(yaml_emitter_t));
-}
-
-/*
- * String write handler.
- */
-
-static int
-yaml_string_write_handler(void *data, unsigned char *buffer, size_t size)
-{
-    yaml_emitter_t *emitter = data;
-
-    if (emitter->output.string.size + *emitter->output.string.size_written
-            < size) {
-        memcpy(emitter->output.string.buffer
-                + *emitter->output.string.size_written,
-                buffer,
-                emitter->output.string.size
-                - *emitter->output.string.size_written);
-        *emitter->output.string.size_written = emitter->output.string.size;
-        return 0;
-    }
-
-    memcpy(emitter->output.string.buffer
-            + *emitter->output.string.size_written, buffer, size);
-    *emitter->output.string.size_written += size;
-    return 1;
-}
-
-/*
- * File write handler.
- */
-
-static int
-yaml_file_write_handler(void *data, unsigned char *buffer, size_t size)
-{
-    yaml_emitter_t *emitter = data;
-
-    return (fwrite(buffer, 1, size, emitter->output.file) == size);
-}
-/*
- * Set a string output.
- */
-
-YAML_DECLARE(void)
-yaml_emitter_set_output_string(yaml_emitter_t *emitter,
-        unsigned char *output, size_t size, size_t *size_written)
-{
-    assert(emitter);    /* Non-NULL emitter object expected. */
-    assert(!emitter->write_handler);    /* You can set the output only once. */
-    assert(output);     /* Non-NULL output string expected. */
-
-    emitter->write_handler = yaml_string_write_handler;
-    emitter->write_handler_data = emitter;
-
-    emitter->output.string.buffer = output;
-    emitter->output.string.size = size;
-    emitter->output.string.size_written = size_written;
-    *size_written = 0;
-}
-
-/*
- * Set a file output.
- */
-
-YAML_DECLARE(void)
-yaml_emitter_set_output_file(yaml_emitter_t *emitter, FILE *file)
-{
-    assert(emitter);    /* Non-NULL emitter object expected. */
-    assert(!emitter->write_handler);    /* You can set the output only once. */
-    assert(file);       /* Non-NULL file object expected. */
-
-    emitter->write_handler = yaml_file_write_handler;
-    emitter->write_handler_data = emitter;
-
-    emitter->output.file = file;
-}
-
-/*
- * Set a generic output handler.
- */
-
-YAML_DECLARE(void)
-yaml_emitter_set_output(yaml_emitter_t *emitter,
-        yaml_write_handler_t *handler, void *data)
-{
-    assert(emitter);    /* Non-NULL emitter object expected. */
-    assert(!emitter->write_handler);    /* You can set the output only once. */
-    assert(handler);    /* Non-NULL handler object expected. */
-
-    emitter->write_handler = handler;
-    emitter->write_handler_data = data;
-}
-
-/*
- * Set the output encoding.
- */
-
-YAML_DECLARE(void)
-yaml_emitter_set_encoding(yaml_emitter_t *emitter, yaml_encoding_t encoding)
-{
-    assert(emitter);    /* Non-NULL emitter object expected. */
-    assert(!emitter->encoding);     /* You can set encoding only once. */
-
-    emitter->encoding = encoding;
-}
-
-/*
- * Set the canonical output style.
- */
-
-YAML_DECLARE(void)
-yaml_emitter_set_canonical(yaml_emitter_t *emitter, int canonical)
-{
-    assert(emitter);    /* Non-NULL emitter object expected. */
-
-    emitter->canonical = (canonical != 0);
-}
-
-/*
- * Set the indentation increment.
- */
-
-YAML_DECLARE(void)
-yaml_emitter_set_indent(yaml_emitter_t *emitter, int indent)
-{
-    assert(emitter);    /* Non-NULL emitter object expected. */
-
-    emitter->best_indent = (1 < indent && indent < 10) ? indent : 2;
-}
-
-/*
- * Set the preferred line width.
- */
-
-YAML_DECLARE(void)
-yaml_emitter_set_width(yaml_emitter_t *emitter, int width)
-{
-    assert(emitter);    /* Non-NULL emitter object expected. */
-
-    emitter->best_width = (width >= 0) ? width : -1;
-}
-
-/*
- * Set if unescaped non-ASCII characters are allowed.
- */
-
-YAML_DECLARE(void)
-yaml_emitter_set_unicode(yaml_emitter_t *emitter, int unicode)
-{
-    assert(emitter);    /* Non-NULL emitter object expected. */
-
-    emitter->unicode = (unicode != 0);
-}
-
-/*
- * Set the preferred line break character.
- */
-
-YAML_DECLARE(void)
-yaml_emitter_set_break(yaml_emitter_t *emitter, yaml_break_t line_break)
-{
-    assert(emitter);    /* Non-NULL emitter object expected. */
-
-    emitter->line_break = line_break;
-}
-
-/*
- * Destroy a token object.
- */
-
-YAML_DECLARE(void)
-yaml_token_delete(yaml_token_t *token)
-{
-    assert(token);  /* Non-NULL token object expected. */
-
-    switch (token->type)
-    {
-        case YAML_TAG_DIRECTIVE_TOKEN:
-            yaml_free(token->data.tag_directive.handle);
-            yaml_free(token->data.tag_directive.prefix);
-            break;
-
-        case YAML_ALIAS_TOKEN:
-            yaml_free(token->data.alias.value);
-            break;
-
-        case YAML_ANCHOR_TOKEN:
-            yaml_free(token->data.anchor.value);
-            break;
-
-        case YAML_TAG_TOKEN:
-            yaml_free(token->data.tag.handle);
-            yaml_free(token->data.tag.suffix);
-            break;
-
-        case YAML_SCALAR_TOKEN:
-            yaml_free(token->data.scalar.value);
-            break;
-
-        default:
-            break;
-    }
-
-    memset(token, 0, sizeof(yaml_token_t));
-}
-
-/*
- * Check if a string is a valid UTF-8 sequence.
- *
- * Check 'reader.c' for more details on UTF-8 encoding.
- */
-
-static int
-yaml_check_utf8(yaml_char_t *start, size_t length)
-{
-    yaml_char_t *end = start+length;
-    yaml_char_t *pointer = start;
-
-    while (pointer < end) {
-        unsigned char octet;
-        unsigned int width;
-        unsigned int value;
-        size_t k;
-
-        octet = pointer[0];
-        width = (octet & 0x80) == 0x00 ? 1 :
-                (octet & 0xE0) == 0xC0 ? 2 :
-                (octet & 0xF0) == 0xE0 ? 3 :
-                (octet & 0xF8) == 0xF0 ? 4 : 0;
-        value = (octet & 0x80) == 0x00 ? octet & 0x7F :
-                (octet & 0xE0) == 0xC0 ? octet & 0x1F :
-                (octet & 0xF0) == 0xE0 ? octet & 0x0F :
-                (octet & 0xF8) == 0xF0 ? octet & 0x07 : 0;
-        if (!width) return 0;
-        if (pointer+width > end) return 0;
-        for (k = 1; k < width; k ++) {
-            octet = pointer[k];
-            if ((octet & 0xC0) != 0x80) return 0;
-            value = (value << 6) + (octet & 0x3F);
-        }
-        if (!((width == 1) ||
-            (width == 2 && value >= 0x80) ||
-            (width == 3 && value >= 0x800) ||
-            (width == 4 && value >= 0x10000))) return 0;
-
-        pointer += width;
-    }
-
-    return 1;
-}
-
-/*
- * Create STREAM-START.
- */
-
-YAML_DECLARE(int)
-yaml_stream_start_event_initialize(yaml_event_t *event,
-        yaml_encoding_t encoding)
-{
-    yaml_mark_t mark = { 0, 0, 0 };
-
-    assert(event);  /* Non-NULL event object is expected. */
-
-    STREAM_START_EVENT_INIT(*event, encoding, mark, mark);
-
-    return 1;
-}
-
-/*
- * Create STREAM-END.
- */
-
-YAML_DECLARE(int)
-yaml_stream_end_event_initialize(yaml_event_t *event)
-{
-    yaml_mark_t mark = { 0, 0, 0 };
-
-    assert(event);  /* Non-NULL event object is expected. */
-
-    STREAM_END_EVENT_INIT(*event, mark, mark);
-
-    return 1;
-}
-
-/*
- * Create DOCUMENT-START.
- */
-
-YAML_DECLARE(int)
-yaml_document_start_event_initialize(yaml_event_t *event,
-        yaml_version_directive_t *version_directive,
-        yaml_tag_directive_t *tag_directives_start,
-        yaml_tag_directive_t *tag_directives_end,
-        int implicit)
-{
-    struct {
-        yaml_error_type_t error;
-    } context;
-    yaml_mark_t mark = { 0, 0, 0 };
-    yaml_version_directive_t *version_directive_copy = NULL;
-    struct {
-        yaml_tag_directive_t *start;
-        yaml_tag_directive_t *end;
-        yaml_tag_directive_t *top;
-    } tag_directives_copy = { NULL, NULL, NULL };
-    yaml_tag_directive_t value = { NULL, NULL };
-
-    assert(event);          /* Non-NULL event object is expected. */
-    assert((tag_directives_start && tag_directives_end) ||
-            (tag_directives_start == tag_directives_end));
-                            /* Valid tag directives are expected. */
-
-    if (version_directive) {
-        version_directive_copy = yaml_malloc(sizeof(yaml_version_directive_t));
-        if (!version_directive_copy) goto error;
-        version_directive_copy->major = version_directive->major;
-        version_directive_copy->minor = version_directive->minor;
-    }
-
-    if (tag_directives_start != tag_directives_end) {
-        yaml_tag_directive_t *tag_directive;
-        if (!STACK_INIT(&context, tag_directives_copy, INITIAL_STACK_SIZE))
-            goto error;
-        for (tag_directive = tag_directives_start;
-                tag_directive != tag_directives_end; tag_directive ++) {
-            assert(tag_directive->handle);
-            assert(tag_directive->prefix);
-            if (!yaml_check_utf8(tag_directive->handle,
-                        strlen((char *)tag_directive->handle)))
-                goto error;
-            if (!yaml_check_utf8(tag_directive->prefix,
-                        strlen((char *)tag_directive->prefix)))
-                goto error;
-            value.handle = yaml_strdup(tag_directive->handle);
-            value.prefix = yaml_strdup(tag_directive->prefix);
-            if (!value.handle || !value.prefix) goto error;
-            if (!PUSH(&context, tag_directives_copy, value))
-                goto error;
-            value.handle = NULL;
-            value.prefix = NULL;
-        }
-    }
-
-    DOCUMENT_START_EVENT_INIT(*event, version_directive_copy,
-            tag_directives_copy.start, tag_directives_copy.top,
-            implicit, mark, mark);
-
-    return 1;
-
-error:
-    yaml_free(version_directive_copy);
-    while (!STACK_EMPTY(context, tag_directives_copy)) {
-        yaml_tag_directive_t value = POP(context, tag_directives_copy);
-        yaml_free(value.handle);
-        yaml_free(value.prefix);
-    }
-    STACK_DEL(context, tag_directives_copy);
-    yaml_free(value.handle);
-    yaml_free(value.prefix);
-
-    return 0;
-}
-
-/*
- * Create DOCUMENT-END.
- */
-
-YAML_DECLARE(int)
-yaml_document_end_event_initialize(yaml_event_t *event, int implicit)
-{
-    yaml_mark_t mark = { 0, 0, 0 };
-
-    assert(event);      /* Non-NULL emitter object is expected. */
-
-    DOCUMENT_END_EVENT_INIT(*event, implicit, mark, mark);
-
-    return 1;
-}
-
-/*
- * Create ALIAS.
- */
-
-YAML_DECLARE(int)
-yaml_alias_event_initialize(yaml_event_t *event, yaml_char_t *anchor)
-{
-    yaml_mark_t mark = { 0, 0, 0 };
-    yaml_char_t *anchor_copy = NULL;
-
-    assert(event);      /* Non-NULL event object is expected. */
-    assert(anchor);     /* Non-NULL anchor is expected. */
-
-    if (!yaml_check_utf8(anchor, strlen((char *)anchor))) return 0;
-
-    anchor_copy = yaml_strdup(anchor);
-    if (!anchor_copy)
-        return 0;
-
-    ALIAS_EVENT_INIT(*event, anchor_copy, mark, mark);
-
-    return 1;
-}
-
-/*
- * Create SCALAR.
- */
-
-YAML_DECLARE(int)
-yaml_scalar_event_initialize(yaml_event_t *event,
-        yaml_char_t *anchor, yaml_char_t *tag,
-        yaml_char_t *value, int length,
-        int plain_implicit, int quoted_implicit,
-        yaml_scalar_style_t style)
-{
-    yaml_mark_t mark = { 0, 0, 0 };
-    yaml_char_t *anchor_copy = NULL;
-    yaml_char_t *tag_copy = NULL;
-    yaml_char_t *value_copy = NULL;
-
-    assert(event);      /* Non-NULL event object is expected. */
-    assert(value);      /* Non-NULL anchor is expected. */
-
-    if (anchor) {
-        if (!yaml_check_utf8(anchor, strlen((char *)anchor))) goto error;
-        anchor_copy = yaml_strdup(anchor);
-        if (!anchor_copy) goto error;
-    }
-
-    if (tag) {
-        if (!yaml_check_utf8(tag, strlen((char *)tag))) goto error;
-        tag_copy = yaml_strdup(tag);
-        if (!tag_copy) goto error;
-    }
-
-    if (length < 0) {
-        length = strlen((char *)value);
-    }
-
-    if (!yaml_check_utf8(value, length)) goto error;
-    value_copy = yaml_malloc(length+1);
-    if (!value_copy) goto error;
-    memcpy(value_copy, value, length);
-    value_copy[length] = '\0';
-
-    SCALAR_EVENT_INIT(*event, anchor_copy, tag_copy, value_copy, length,
-            plain_implicit, quoted_implicit, style, mark, mark);
-
-    return 1;
-
-error:
-    yaml_free(anchor_copy);
-    yaml_free(tag_copy);
-    yaml_free(value_copy);
-
-    return 0;
-}
-
-/*
- * Create SEQUENCE-START.
- */
-
-YAML_DECLARE(int)
-yaml_sequence_start_event_initialize(yaml_event_t *event,
-        yaml_char_t *anchor, yaml_char_t *tag, int implicit,
-        yaml_sequence_style_t style)
-{
-    yaml_mark_t mark = { 0, 0, 0 };
-    yaml_char_t *anchor_copy = NULL;
-    yaml_char_t *tag_copy = NULL;
-
-    assert(event);      /* Non-NULL event object is expected. */
-
-    if (anchor) {
-        if (!yaml_check_utf8(anchor, strlen((char *)anchor))) goto error;
-        anchor_copy = yaml_strdup(anchor);
-        if (!anchor_copy) goto error;
-    }
-
-    if (tag) {
-        if (!yaml_check_utf8(tag, strlen((char *)tag))) goto error;
-        tag_copy = yaml_strdup(tag);
-        if (!tag_copy) goto error;
-    }
-
-    SEQUENCE_START_EVENT_INIT(*event, anchor_copy, tag_copy,
-            implicit, style, mark, mark);
-
-    return 1;
-
-error:
-    yaml_free(anchor_copy);
-    yaml_free(tag_copy);
-
-    return 0;
-}
-
-/*
- * Create SEQUENCE-END.
- */
-
-YAML_DECLARE(int)
-yaml_sequence_end_event_initialize(yaml_event_t *event)
-{
-    yaml_mark_t mark = { 0, 0, 0 };
-
-    assert(event);      /* Non-NULL event object is expected. */
-
-    SEQUENCE_END_EVENT_INIT(*event, mark, mark);
-
-    return 1;
-}
-
-/*
- * Create MAPPING-START.
- */
-
-YAML_DECLARE(int)
-yaml_mapping_start_event_initialize(yaml_event_t *event,
-        yaml_char_t *anchor, yaml_char_t *tag, int implicit,
-        yaml_mapping_style_t style)
-{
-    yaml_mark_t mark = { 0, 0, 0 };
-    yaml_char_t *anchor_copy = NULL;
-    yaml_char_t *tag_copy = NULL;
-
-    assert(event);      /* Non-NULL event object is expected. */
-
-    if (anchor) {
-        if (!yaml_check_utf8(anchor, strlen((char *)anchor))) goto error;
-        anchor_copy = yaml_strdup(anchor);
-        if (!anchor_copy) goto error;
-    }
-
-    if (tag) {
-        if (!yaml_check_utf8(tag, strlen((char *)tag))) goto error;
-        tag_copy = yaml_strdup(tag);
-        if (!tag_copy) goto error;
-    }
-
-    MAPPING_START_EVENT_INIT(*event, anchor_copy, tag_copy,
-            implicit, style, mark, mark);
-
-    return 1;
-
-error:
-    yaml_free(anchor_copy);
-    yaml_free(tag_copy);
-
-    return 0;
-}
-
-/*
- * Create MAPPING-END.
- */
-
-YAML_DECLARE(int)
-yaml_mapping_end_event_initialize(yaml_event_t *event)
-{
-    yaml_mark_t mark = { 0, 0, 0 };
-
-    assert(event);      /* Non-NULL event object is expected. */
-
-    MAPPING_END_EVENT_INIT(*event, mark, mark);
-
-    return 1;
-}
-
-/*
- * Destroy an event object.
- */
-
-YAML_DECLARE(void)
-yaml_event_delete(yaml_event_t *event)
-{
-    yaml_tag_directive_t *tag_directive;
-
-    assert(event);  /* Non-NULL event object expected. */
-
-    switch (event->type)
-    {
-        case YAML_DOCUMENT_START_EVENT:
-            yaml_free(event->data.document_start.version_directive);
-            for (tag_directive = event->data.document_start.tag_directives.start;
-                    tag_directive != event->data.document_start.tag_directives.end;
-                    tag_directive++) {
-                yaml_free(tag_directive->handle);
-                yaml_free(tag_directive->prefix);
-            }
-            yaml_free(event->data.document_start.tag_directives.start);
-            break;
-
-        case YAML_ALIAS_EVENT:
-            yaml_free(event->data.alias.anchor);
-            break;
-
-        case YAML_SCALAR_EVENT:
-            yaml_free(event->data.scalar.anchor);
-            yaml_free(event->data.scalar.tag);
-            yaml_free(event->data.scalar.value);
-            break;
-
-        case YAML_SEQUENCE_START_EVENT:
-            yaml_free(event->data.sequence_start.anchor);
-            yaml_free(event->data.sequence_start.tag);
-            break;
-
-        case YAML_MAPPING_START_EVENT:
-            yaml_free(event->data.mapping_start.anchor);
-            yaml_free(event->data.mapping_start.tag);
-            break;
-
-        default:
-            break;
-    }
-
-    memset(event, 0, sizeof(yaml_event_t));
-}
-
-/*
- * Create a document object.
- */
-
-YAML_DECLARE(int)
-yaml_document_initialize(yaml_document_t *document,
-        yaml_version_directive_t *version_directive,
-        yaml_tag_directive_t *tag_directives_start,
-        yaml_tag_directive_t *tag_directives_end,
-        int start_implicit, int end_implicit)
-{
-    struct {
-        yaml_error_type_t error;
-    } context;
-    struct {
-        yaml_node_t *start;
-        yaml_node_t *end;
-        yaml_node_t *top;
-    } nodes = { NULL, NULL, NULL };
-    yaml_version_directive_t *version_directive_copy = NULL;
-    struct {
-        yaml_tag_directive_t *start;
-        yaml_tag_directive_t *end;
-        yaml_tag_directive_t *top;
-    } tag_directives_copy = { NULL, NULL, NULL };
-    yaml_tag_directive_t value = { NULL, NULL };
-    yaml_mark_t mark = { 0, 0, 0 };
-
-    assert(document);       /* Non-NULL document object is expected. */
-    assert((tag_directives_start && tag_directives_end) ||
-            (tag_directives_start == tag_directives_end));
-                            /* Valid tag directives are expected. */
-
-    if (!STACK_INIT(&context, nodes, INITIAL_STACK_SIZE)) goto error;
-
-    if (version_directive) {
-        version_directive_copy = yaml_malloc(sizeof(yaml_version_directive_t));
-        if (!version_directive_copy) goto error;
-        version_directive_copy->major = version_directive->major;
-        version_directive_copy->minor = version_directive->minor;
-    }
-
-    if (tag_directives_start != tag_directives_end) {
-        yaml_tag_directive_t *tag_directive;
-        if (!STACK_INIT(&context, tag_directives_copy, INITIAL_STACK_SIZE))
-            goto error;
-        for (tag_directive = tag_directives_start;
-                tag_directive != tag_directives_end; tag_directive ++) {
-            assert(tag_directive->handle);
-            assert(tag_directive->prefix);
-            if (!yaml_check_utf8(tag_directive->handle,
-                        strlen((char *)tag_directive->handle)))
-                goto error;
-            if (!yaml_check_utf8(tag_directive->prefix,
-                        strlen((char *)tag_directive->prefix)))
-                goto error;
-            value.handle = yaml_strdup(tag_directive->handle);
-            value.prefix = yaml_strdup(tag_directive->prefix);
-            if (!value.handle || !value.prefix) goto error;
-            if (!PUSH(&context, tag_directives_copy, value))
-                goto error;
-            value.handle = NULL;
-            value.prefix = NULL;
-        }
-    }
-
-    DOCUMENT_INIT(*document, nodes.start, nodes.end, version_directive_copy,
-            tag_directives_copy.start, tag_directives_copy.top,
-            start_implicit, end_implicit, mark, mark);
-
-    return 1;
-
-error:
-    STACK_DEL(&context, nodes);
-    yaml_free(version_directive_copy);
-    while (!STACK_EMPTY(&context, tag_directives_copy)) {
-        yaml_tag_directive_t value = POP(&context, tag_directives_copy);
-        yaml_free(value.handle);
-        yaml_free(value.prefix);
-    }
-    STACK_DEL(&context, tag_directives_copy);
-    yaml_free(value.handle);
-    yaml_free(value.prefix);
-
-    return 0;
-}
-
-/*
- * Destroy a document object.
- */
-
-YAML_DECLARE(void)
-yaml_document_delete(yaml_document_t *document)
-{
-    struct {
-        yaml_error_type_t error;
-    } context;
-    yaml_tag_directive_t *tag_directive;
-
-    context.error = YAML_NO_ERROR;  /* Eliminate a compliler warning. */
-
-    assert(document);   /* Non-NULL document object is expected. */
-
-    while (!STACK_EMPTY(&context, document->nodes)) {
-        yaml_node_t node = POP(&context, document->nodes);
-        yaml_free(node.tag);
-        switch (node.type) {
-            case YAML_SCALAR_NODE:
-                yaml_free(node.data.scalar.value);
-                break;
-            case YAML_SEQUENCE_NODE:
-                STACK_DEL(&context, node.data.sequence.items);
-                break;
-            case YAML_MAPPING_NODE:
-                STACK_DEL(&context, node.data.mapping.pairs);
-                break;
-            default:
-                assert(0);  /* Should not happen. */
-        }
-    }
-    STACK_DEL(&context, document->nodes);
-
-    yaml_free(document->version_directive);
-    for (tag_directive = document->tag_directives.start;
-            tag_directive != document->tag_directives.end;
-            tag_directive++) {
-        yaml_free(tag_directive->handle);
-        yaml_free(tag_directive->prefix);
-    }
-    yaml_free(document->tag_directives.start);
-
-    memset(document, 0, sizeof(yaml_document_t));
-}
-
-/**
- * Get a document node.
- */
-
-YAML_DECLARE(yaml_node_t *)
-yaml_document_get_node(yaml_document_t *document, int index)
-{
-    assert(document);   /* Non-NULL document object is expected. */
-
-    if (index > 0 && document->nodes.start + index <= document->nodes.top) {
-        return document->nodes.start + index - 1;
-    }
-    return NULL;
-}
-
-/**
- * Get the root object.
- */
-
-YAML_DECLARE(yaml_node_t *)
-yaml_document_get_root_node(yaml_document_t *document)
-{
-    assert(document);   /* Non-NULL document object is expected. */
-
-    if (document->nodes.top != document->nodes.start) {
-        return document->nodes.start;
-    }
-    return NULL;
-}
-
-/*
- * Add a scalar node to a document.
- */
-
-YAML_DECLARE(int)
-yaml_document_add_scalar(yaml_document_t *document,
-        yaml_char_t *tag, yaml_char_t *value, int length,
-        yaml_scalar_style_t style)
-{
-    struct {
-        yaml_error_type_t error;
-    } context;
-    yaml_mark_t mark = { 0, 0, 0 };
-    yaml_char_t *tag_copy = NULL;
-    yaml_char_t *value_copy = NULL;
-    yaml_node_t node;
-
-    assert(document);   /* Non-NULL document object is expected. */
-    assert(value);      /* Non-NULL value is expected. */
-
-    if (!tag) {
-        tag = (yaml_char_t *)YAML_DEFAULT_SCALAR_TAG;
-    }
-
-    if (!yaml_check_utf8(tag, strlen((char *)tag))) goto error;
-    tag_copy = yaml_strdup(tag);
-    if (!tag_copy) goto error;
-
-    if (length < 0) {
-        length = strlen((char *)value);
-    }
-
-    if (!yaml_check_utf8(value, length)) goto error;
-    value_copy = yaml_malloc(length+1);
-    if (!value_copy) goto error;
-    memcpy(value_copy, value, length);
-    value_copy[length] = '\0';
-
-    SCALAR_NODE_INIT(node, tag_copy, value_copy, length, style, mark, mark);
-    if (!PUSH(&context, document->nodes, node)) goto error;
-
-    return document->nodes.top - document->nodes.start;
-
-error:
-    yaml_free(tag_copy);
-    yaml_free(value_copy);
-
-    return 0;
-}
-
-/*
- * Add a sequence node to a document.
- */
-
-YAML_DECLARE(int)
-yaml_document_add_sequence(yaml_document_t *document,
-        yaml_char_t *tag, yaml_sequence_style_t style)
-{
-    struct {
-        yaml_error_type_t error;
-    } context;
-    yaml_mark_t mark = { 0, 0, 0 };
-    yaml_char_t *tag_copy = NULL;
-    struct {
-        yaml_node_item_t *start;
-        yaml_node_item_t *end;
-        yaml_node_item_t *top;
-    } items = { NULL, NULL, NULL };
-    yaml_node_t node;
-
-    assert(document);   /* Non-NULL document object is expected. */
-
-    if (!tag) {
-        tag = (yaml_char_t *)YAML_DEFAULT_SEQUENCE_TAG;
-    }
-
-    if (!yaml_check_utf8(tag, strlen((char *)tag))) goto error;
-    tag_copy = yaml_strdup(tag);
-    if (!tag_copy) goto error;
-
-    if (!STACK_INIT(&context, items, INITIAL_STACK_SIZE)) goto error;
-
-    SEQUENCE_NODE_INIT(node, tag_copy, items.start, items.end,
-            style, mark, mark);
-    if (!PUSH(&context, document->nodes, node)) goto error;
-
-    return document->nodes.top - document->nodes.start;
-
-error:
-    STACK_DEL(&context, items);
-    yaml_free(tag_copy);
-
-    return 0;
-}
-
-/*
- * Add a mapping node to a document.
- */
-
-YAML_DECLARE(int)
-yaml_document_add_mapping(yaml_document_t *document,
-        yaml_char_t *tag, yaml_mapping_style_t style)
-{
-    struct {
-        yaml_error_type_t error;
-    } context;
-    yaml_mark_t mark = { 0, 0, 0 };
-    yaml_char_t *tag_copy = NULL;
-    struct {
-        yaml_node_pair_t *start;
-        yaml_node_pair_t *end;
-        yaml_node_pair_t *top;
-    } pairs = { NULL, NULL, NULL };
-    yaml_node_t node;
-
-    assert(document);   /* Non-NULL document object is expected. */
-
-    if (!tag) {
-        tag = (yaml_char_t *)YAML_DEFAULT_MAPPING_TAG;
-    }
-
-    if (!yaml_check_utf8(tag, strlen((char *)tag))) goto error;
-    tag_copy = yaml_strdup(tag);
-    if (!tag_copy) goto error;
-
-    if (!STACK_INIT(&context, pairs, INITIAL_STACK_SIZE)) goto error;
-
-    MAPPING_NODE_INIT(node, tag_copy, pairs.start, pairs.end,
-            style, mark, mark);
-    if (!PUSH(&context, document->nodes, node)) goto error;
-
-    return document->nodes.top - document->nodes.start;
-
-error:
-    STACK_DEL(&context, pairs);
-    yaml_free(tag_copy);
-
-    return 0;
-}
-
-/*
- * Append an item to a sequence node.
- */
-
-YAML_DECLARE(int)
-yaml_document_append_sequence_item(yaml_document_t *document,
-        int sequence, int item)
-{
-    struct {
-        yaml_error_type_t error;
-    } context;
-
-    assert(document);       /* Non-NULL document is required. */
-    assert(sequence > 0
-            && document->nodes.start + sequence <= document->nodes.top);
-                            /* Valid sequence id is required. */
-    assert(document->nodes.start[sequence-1].type == YAML_SEQUENCE_NODE);
-                            /* A sequence node is required. */
-    assert(item > 0 && document->nodes.start + item <= document->nodes.top);
-                            /* Valid item id is required. */
-
-    if (!PUSH(&context,
-                document->nodes.start[sequence-1].data.sequence.items, item))
-        return 0;
-
-    return 1;
-}
-
-/*
- * Append a pair of a key and a value to a mapping node.
- */
-
-YAML_DECLARE(int)
-yaml_document_append_mapping_pair(yaml_document_t *document,
-        int mapping, int key, int value)
-{
-    struct {
-        yaml_error_type_t error;
-    } context;
-
-    yaml_node_pair_t pair;
-
-    assert(document);       /* Non-NULL document is required. */
-    assert(mapping > 0
-            && document->nodes.start + mapping <= document->nodes.top);
-                            /* Valid mapping id is required. */
-    assert(document->nodes.start[mapping-1].type == YAML_MAPPING_NODE);
-                            /* A mapping node is required. */
-    assert(key > 0 && document->nodes.start + key <= document->nodes.top);
-                            /* Valid key id is required. */
-    assert(value > 0 && document->nodes.start + value <= document->nodes.top);
-                            /* Valid value id is required. */
-
-    pair.key = key;
-    pair.value = value;
-
-    if (!PUSH(&context,
-                document->nodes.start[mapping-1].data.mapping.pairs, pair))
-        return 0;
-
-    return 1;
-}
-
-

api_c.go

@@ -91,7 +91,7 @@ func yaml_parser_set_encoding(parser *yaml_parser_t, encoding yaml_encoding_t) {
 func yaml_emitter_initialize(emitter *yaml_emitter_t) bool {
 	// [Go] These should be initialized lazily instead.
 	*emitter = yaml_emitter_t{
-		buffer:         make([]byte, 0, output_buffer_size),
+		buffer:         make([]byte, output_buffer_size),
 		raw_buffer:     make([]byte, 0, output_raw_buffer_size),
 		states:         make([]yaml_emitter_state_t, 0, initial_stack_size),
 		events:         make([]yaml_event_t, 0, initial_queue_size),

config.h

@@ -1,4 +0,0 @@
-#define YAML_VERSION_STRING "0.1.3"
-#define YAML_VERSION_MAJOR 0
-#define YAML_VERSION_MINOR 1
-#define YAML_VERSION_PATCH 3

emitter.c

@@ -1,2329 +0,0 @@
-
-#include "yaml_private.h"
-
-/*
- * Flush the buffer if needed.
- */
-
-#define FLUSH(emitter)                                                          \
-    ((emitter->buffer.pointer+5 < emitter->buffer.end)                          \
-     || yaml_emitter_flush(emitter))
-
-/*
- * Put a character to the output buffer.
- */
-
-#define PUT(emitter,value)                                                      \
-    (FLUSH(emitter)                                                             \
-     && (*(emitter->buffer.pointer++) = (yaml_char_t)(value),                   \
-         emitter->column ++,                                                    \
-         1))
-
-/*
- * Put a line break to the output buffer.
- */
-
-#define PUT_BREAK(emitter)                                                      \
-    (FLUSH(emitter)                                                             \
-     && ((emitter->line_break == YAML_CR_BREAK ?                                \
-             (*(emitter->buffer.pointer++) = (yaml_char_t) '\r') :              \
-          emitter->line_break == YAML_LN_BREAK ?                                \
-             (*(emitter->buffer.pointer++) = (yaml_char_t) '\n') :              \
-          emitter->line_break == YAML_CRLN_BREAK ?                              \
-             (*(emitter->buffer.pointer++) = (yaml_char_t) '\r',                \
-              *(emitter->buffer.pointer++) = (yaml_char_t) '\n') : 0),          \
-         emitter->column = 0,                                                   \
-         emitter->line ++,                                                      \
-         1))
-
-/*
- * Copy a character from a string into buffer.
- */
-
-#define WRITE(emitter,string)                                                   \
-    (FLUSH(emitter)                                                             \
-     && (COPY(emitter->buffer,string),                                          \
-         emitter->column ++,                                                    \
-         1))
-
-/*
- * Copy a line break character from a string into buffer.
- */
-
-#define WRITE_BREAK(emitter,string)                                             \
-    (FLUSH(emitter)                                                             \
-     && (CHECK(string,'\n') ?                                                   \
-         (PUT_BREAK(emitter),                                                   \
-          string.pointer ++,                                                    \
-          1) :                                                                  \
-         (COPY(emitter->buffer,string),                                         \
-          emitter->column = 0,                                                  \
-          emitter->line ++,                                                     \
-          1)))
-
-/*
- * API functions.
- */
-
-YAML_DECLARE(int)
-yaml_emitter_emit(yaml_emitter_t *emitter, yaml_event_t *event);
-
-/*
- * Utility functions.
- */
-
-static int
-yaml_emitter_set_emitter_error(yaml_emitter_t *emitter, const char *problem);
-
-static int
-yaml_emitter_need_more_events(yaml_emitter_t *emitter);
-
-static int
-yaml_emitter_append_tag_directive(yaml_emitter_t *emitter,
-        yaml_tag_directive_t value, int allow_duplicates);
-
-static int
-yaml_emitter_increase_indent(yaml_emitter_t *emitter,
-        int flow, int indentless);
-
-/*
- * State functions.
- */
-
-static int
-yaml_emitter_state_machine(yaml_emitter_t *emitter, yaml_event_t *event);
-
-static int
-yaml_emitter_emit_stream_start(yaml_emitter_t *emitter,
-        yaml_event_t *event);
-
-static int
-yaml_emitter_emit_document_start(yaml_emitter_t *emitter,
-        yaml_event_t *event, int first);
-
-static int
-yaml_emitter_emit_document_content(yaml_emitter_t *emitter,
-        yaml_event_t *event);
-
-static int
-yaml_emitter_emit_document_end(yaml_emitter_t *emitter,
-        yaml_event_t *event);
-
-static int
-yaml_emitter_emit_flow_sequence_item(yaml_emitter_t *emitter,
-        yaml_event_t *event, int first);
-
-static int
-yaml_emitter_emit_flow_mapping_key(yaml_emitter_t *emitter,
-        yaml_event_t *event, int first);
-
-static int
-yaml_emitter_emit_flow_mapping_value(yaml_emitter_t *emitter,
-        yaml_event_t *event, int simple);
-
-static int
-yaml_emitter_emit_block_sequence_item(yaml_emitter_t *emitter,
-        yaml_event_t *event, int first);
-
-static int
-yaml_emitter_emit_block_mapping_key(yaml_emitter_t *emitter,
-        yaml_event_t *event, int first);
-
-static int
-yaml_emitter_emit_block_mapping_value(yaml_emitter_t *emitter,
-        yaml_event_t *event, int simple);
-
-static int
-yaml_emitter_emit_node(yaml_emitter_t *emitter, yaml_event_t *event,
-        int root, int sequence, int mapping, int simple_key);
-
-static int
-yaml_emitter_emit_alias(yaml_emitter_t *emitter, yaml_event_t *event);
-
-static int
-yaml_emitter_emit_scalar(yaml_emitter_t *emitter, yaml_event_t *event);
-
-static int
-yaml_emitter_emit_sequence_start(yaml_emitter_t *emitter, yaml_event_t *event);
-
-static int
-yaml_emitter_emit_mapping_start(yaml_emitter_t *emitter, yaml_event_t *event);
-
-/*
- * Checkers.
- */
-
-static int
-yaml_emitter_check_empty_document(yaml_emitter_t *emitter);
-
-static int
-yaml_emitter_check_empty_sequence(yaml_emitter_t *emitter);
-
-static int
-yaml_emitter_check_empty_mapping(yaml_emitter_t *emitter);
-
-static int
-yaml_emitter_check_simple_key(yaml_emitter_t *emitter);
-
-static int
-yaml_emitter_select_scalar_style(yaml_emitter_t *emitter, yaml_event_t *event);
-
-/*
- * Processors.
- */
-
-static int
-yaml_emitter_process_anchor(yaml_emitter_t *emitter);
-
-static int
-yaml_emitter_process_tag(yaml_emitter_t *emitter);
-
-static int
-yaml_emitter_process_scalar(yaml_emitter_t *emitter);
-
-/*
- * Analyzers.
- */
-
-static int
-yaml_emitter_analyze_version_directive(yaml_emitter_t *emitter,
-        yaml_version_directive_t version_directive);
-
-static int
-yaml_emitter_analyze_tag_directive(yaml_emitter_t *emitter,
-        yaml_tag_directive_t tag_directive);
-
-static int
-yaml_emitter_analyze_anchor(yaml_emitter_t *emitter,
-        yaml_char_t *anchor, int alias);
-
-static int
-yaml_emitter_analyze_tag(yaml_emitter_t *emitter,
-        yaml_char_t *tag);
-
-static int
-yaml_emitter_analyze_scalar(yaml_emitter_t *emitter,
-        yaml_char_t *value, size_t length);
-
-static int
-yaml_emitter_analyze_event(yaml_emitter_t *emitter,
-        yaml_event_t *event);
-
-/*
- * Writers.
- */
-
-static int
-yaml_emitter_write_bom(yaml_emitter_t *emitter);
-
-static int
-yaml_emitter_write_indent(yaml_emitter_t *emitter);
-
-static int
-yaml_emitter_write_indicator(yaml_emitter_t *emitter,
-        char *indicator, int need_whitespace,
-        int is_whitespace, int is_indention);
-
-static int
-yaml_emitter_write_anchor(yaml_emitter_t *emitter,
-        yaml_char_t *value, size_t length);
-
-static int
-yaml_emitter_write_tag_handle(yaml_emitter_t *emitter,
-        yaml_char_t *value, size_t length);
-
-static int
-yaml_emitter_write_tag_content(yaml_emitter_t *emitter,
-        yaml_char_t *value, size_t length, int need_whitespace);
-
-static int
-yaml_emitter_write_plain_scalar(yaml_emitter_t *emitter,
-        yaml_char_t *value, size_t length, int allow_breaks);
-
-static int
-yaml_emitter_write_single_quoted_scalar(yaml_emitter_t *emitter,
-        yaml_char_t *value, size_t length, int allow_breaks);
-
-static int
-yaml_emitter_write_double_quoted_scalar(yaml_emitter_t *emitter,
-        yaml_char_t *value, size_t length, int allow_breaks);
-
-static int
-yaml_emitter_write_block_scalar_hints(yaml_emitter_t *emitter,
-        yaml_string_t string);
-
-static int
-yaml_emitter_write_literal_scalar(yaml_emitter_t *emitter,
-        yaml_char_t *value, size_t length);
-
-static int
-yaml_emitter_write_folded_scalar(yaml_emitter_t *emitter,
-        yaml_char_t *value, size_t length);
-
-/*
- * Set an emitter error and return 0.
- */
-
-static int
-yaml_emitter_set_emitter_error(yaml_emitter_t *emitter, const char *problem)
-{
-    emitter->error = YAML_EMITTER_ERROR;
-    emitter->problem = problem;
-
-    return 0;
-}
-
-/*
- * Emit an event.
- */
-
-YAML_DECLARE(int)
-yaml_emitter_emit(yaml_emitter_t *emitter, yaml_event_t *event)
-{
-    if (!ENQUEUE(emitter, emitter->events, *event)) {
-        yaml_event_delete(event);
-        return 0;
-    }
-
-    while (!yaml_emitter_need_more_events(emitter)) {
-        if (!yaml_emitter_analyze_event(emitter, emitter->events.head))
-            return 0;
-        if (!yaml_emitter_state_machine(emitter, emitter->events.head))
-            return 0;
-        yaml_event_delete(&DEQUEUE(emitter, emitter->events));
-    }
-
-    return 1;
-}
-
-/*
- * Check if we need to accumulate more events before emitting.
- *
- * We accumulate extra
- *  - 1 event for DOCUMENT-START
- *  - 2 events for SEQUENCE-START
- *  - 3 events for MAPPING-START
- */
-
-static int
-yaml_emitter_need_more_events(yaml_emitter_t *emitter)
-{
-    int level = 0;
-    int accumulate = 0;
-    yaml_event_t *event;
-
-    if (QUEUE_EMPTY(emitter, emitter->events))
-        return 1;
-
-    switch (emitter->events.head->type) {
-        case YAML_DOCUMENT_START_EVENT:
-            accumulate = 1;
-            break;
-        case YAML_SEQUENCE_START_EVENT:
-            accumulate = 2;
-            break;
-        case YAML_MAPPING_START_EVENT:
-            accumulate = 3;
-            break;
-        default:
-            return 0;
-    }
-
-    if (emitter->events.tail - emitter->events.head > accumulate)
-        return 0;
-
-    for (event = emitter->events.head; event != emitter->events.tail; event ++) {
-        switch (event->type) {
-            case YAML_STREAM_START_EVENT:
-            case YAML_DOCUMENT_START_EVENT:
-            case YAML_SEQUENCE_START_EVENT:
-            case YAML_MAPPING_START_EVENT:
-                level += 1;
-                break;
-            case YAML_STREAM_END_EVENT:
-            case YAML_DOCUMENT_END_EVENT:
-            case YAML_SEQUENCE_END_EVENT:
-            case YAML_MAPPING_END_EVENT:
-                level -= 1;
-                break;
-            default:
-                break;
-        }
-        if (!level)
-            return 0;
-    }
-
-    return 1;
-}
-
-/*
- * Append a directive to the directives stack.
- */
-
-static int
-yaml_emitter_append_tag_directive(yaml_emitter_t *emitter,
-        yaml_tag_directive_t value, int allow_duplicates)
-{
-    yaml_tag_directive_t *tag_directive;
-    yaml_tag_directive_t copy = { NULL, NULL };
-
-    for (tag_directive = emitter->tag_directives.start;
-            tag_directive != emitter->tag_directives.top; tag_directive ++) {
-        if (strcmp((char *)value.handle, (char *)tag_directive->handle) == 0) {
-            if (allow_duplicates)
-                return 1;
-            return yaml_emitter_set_emitter_error(emitter,
-                    "duplicate %TAG directive");
-        }
-    }
-
-    copy.handle = yaml_strdup(value.handle);
-    copy.prefix = yaml_strdup(value.prefix);
-    if (!copy.handle || !copy.prefix) {
-        emitter->error = YAML_MEMORY_ERROR;
-        goto error;
-    }
-
-    if (!PUSH(emitter, emitter->tag_directives, copy))
-        goto error;
-
-    return 1;
-
-error:
-    yaml_free(copy.handle);
-    yaml_free(copy.prefix);
-    return 0;
-}
-
-/*
- * Increase the indentation level.
- */
-
-static int
-yaml_emitter_increase_indent(yaml_emitter_t *emitter,
-        int flow, int indentless)
-{
-    if (!PUSH(emitter, emitter->indents, emitter->indent))
-        return 0;
-
-    if (emitter->indent < 0) {
-        emitter->indent = flow ? emitter->best_indent : 0;
-    }
-    else if (!indentless) {
-        emitter->indent += emitter->best_indent;
-    }
-
-    return 1;
-}
-
-/*
- * State dispatcher.
- */
-
-static int
-yaml_emitter_state_machine(yaml_emitter_t *emitter, yaml_event_t *event)
-{
-    switch (emitter->state)
-    {
-        case YAML_EMIT_STREAM_START_STATE:
-            return yaml_emitter_emit_stream_start(emitter, event);
-
-        case YAML_EMIT_FIRST_DOCUMENT_START_STATE:
-            return yaml_emitter_emit_document_start(emitter, event, 1);
-
-        case YAML_EMIT_DOCUMENT_START_STATE:
-            return yaml_emitter_emit_document_start(emitter, event, 0);
-
-        case YAML_EMIT_DOCUMENT_CONTENT_STATE:
-            return yaml_emitter_emit_document_content(emitter, event);
-
-        case YAML_EMIT_DOCUMENT_END_STATE:
-            return yaml_emitter_emit_document_end(emitter, event);
-
-        case YAML_EMIT_FLOW_SEQUENCE_FIRST_ITEM_STATE:
-            return yaml_emitter_emit_flow_sequence_item(emitter, event, 1);
-
-        case YAML_EMIT_FLOW_SEQUENCE_ITEM_STATE:
-            return yaml_emitter_emit_flow_sequence_item(emitter, event, 0);
-
-        case YAML_EMIT_FLOW_MAPPING_FIRST_KEY_STATE:
-            return yaml_emitter_emit_flow_mapping_key(emitter, event, 1);
-
-        case YAML_EMIT_FLOW_MAPPING_KEY_STATE:
-            return yaml_emitter_emit_flow_mapping_key(emitter, event, 0);
-
-        case YAML_EMIT_FLOW_MAPPING_SIMPLE_VALUE_STATE:
-            return yaml_emitter_emit_flow_mapping_value(emitter, event, 1);
-
-        case YAML_EMIT_FLOW_MAPPING_VALUE_STATE:
-            return yaml_emitter_emit_flow_mapping_value(emitter, event, 0);
-
-        case YAML_EMIT_BLOCK_SEQUENCE_FIRST_ITEM_STATE:
-            return yaml_emitter_emit_block_sequence_item(emitter, event, 1);
-
-        case YAML_EMIT_BLOCK_SEQUENCE_ITEM_STATE:
-            return yaml_emitter_emit_block_sequence_item(emitter, event, 0);
-
-        case YAML_EMIT_BLOCK_MAPPING_FIRST_KEY_STATE:
-            return yaml_emitter_emit_block_mapping_key(emitter, event, 1);
-
-        case YAML_EMIT_BLOCK_MAPPING_KEY_STATE:
-            return yaml_emitter_emit_block_mapping_key(emitter, event, 0);
-
-        case YAML_EMIT_BLOCK_MAPPING_SIMPLE_VALUE_STATE:
-            return yaml_emitter_emit_block_mapping_value(emitter, event, 1);
-
-        case YAML_EMIT_BLOCK_MAPPING_VALUE_STATE:
-            return yaml_emitter_emit_block_mapping_value(emitter, event, 0);
-
-        case YAML_EMIT_END_STATE:
-            return yaml_emitter_set_emitter_error(emitter,
-                    "expected nothing after STREAM-END");
-
-        default:
-            assert(1);      /* Invalid state. */
-    }
-
-    return 0;
-}
-
-/*
- * Expect STREAM-START.
- */
-
-static int
-yaml_emitter_emit_stream_start(yaml_emitter_t *emitter,
-        yaml_event_t *event)
-{
-    if (event->type == YAML_STREAM_START_EVENT)
-    {
-        if (!emitter->encoding) {
-            emitter->encoding = event->data.stream_start.encoding;
-        }
-
-        if (!emitter->encoding) {
-            emitter->encoding = YAML_UTF8_ENCODING;
-        }
-
-        if (emitter->best_indent < 2 || emitter->best_indent > 9) {
-            emitter->best_indent  = 2;
-        }
-
-        if (emitter->best_width >= 0
-                && emitter->best_width <= emitter->best_indent*2) {
-            emitter->best_width = 80;
-        }
-
-        if (emitter->best_width < 0) {
-            emitter->best_width = INT_MAX;
-        }
-        
-        if (!emitter->line_break) {
-            emitter->line_break = YAML_LN_BREAK;
-        }
-
-        emitter->indent = -1;
-
-        emitter->line = 0;
-        emitter->column = 0;
-        emitter->whitespace = 1;
-        emitter->indention = 1;
-
-        if (emitter->encoding != YAML_UTF8_ENCODING) {
-            if (!yaml_emitter_write_bom(emitter))
-                return 0;
-        }
-
-        emitter->state = YAML_EMIT_FIRST_DOCUMENT_START_STATE;
-
-        return 1;
-    }
-
-    return yaml_emitter_set_emitter_error(emitter,
-            "expected STREAM-START");
-}
-
-/*
- * Expect DOCUMENT-START or STREAM-END.
- */
-
-static int
-yaml_emitter_emit_document_start(yaml_emitter_t *emitter,
-        yaml_event_t *event, int first)
-{
-    if (event->type == YAML_DOCUMENT_START_EVENT)
-    {
-        yaml_tag_directive_t default_tag_directives[] = {
-            {(yaml_char_t *)"!", (yaml_char_t *)"!"},
-            {(yaml_char_t *)"!!", (yaml_char_t *)"tag:yaml.org,2002:"},
-            {NULL, NULL}
-        };
-        yaml_tag_directive_t *tag_directive;
-        int implicit;
-
-        if (event->data.document_start.version_directive) {
-            if (!yaml_emitter_analyze_version_directive(emitter,
-                        *event->data.document_start.version_directive))
-                return 0;
-        }
-
-        for (tag_directive = event->data.document_start.tag_directives.start;
-                tag_directive != event->data.document_start.tag_directives.end;
-                tag_directive ++) {
-            if (!yaml_emitter_analyze_tag_directive(emitter, *tag_directive))
-                return 0;
-            if (!yaml_emitter_append_tag_directive(emitter, *tag_directive, 0))
-                return 0;
-        }
-
-        for (tag_directive = default_tag_directives;
-                tag_directive->handle; tag_directive ++) {
-            if (!yaml_emitter_append_tag_directive(emitter, *tag_directive, 1))
-                return 0;
-        }
-
-        implicit = event->data.document_start.implicit;
-        if (!first || emitter->canonical) {
-            implicit = 0;
-        }
-
-        if ((event->data.document_start.version_directive ||
-                    (event->data.document_start.tag_directives.start
-                     != event->data.document_start.tag_directives.end)) &&
-                emitter->open_ended)
-        {
-            if (!yaml_emitter_write_indicator(emitter, "...", 1, 0, 0))
-                return 0;
-            if (!yaml_emitter_write_indent(emitter))
-                return 0;
-        }
-
-        if (event->data.document_start.version_directive) {
-            implicit = 0;
-            if (!yaml_emitter_write_indicator(emitter, "%YAML", 1, 0, 0))
-                return 0;
-            if (!yaml_emitter_write_indicator(emitter, "1.1", 1, 0, 0))
-                return 0;
-            if (!yaml_emitter_write_indent(emitter))
-                return 0;
-        }
-        
-        if (event->data.document_start.tag_directives.start
-                != event->data.document_start.tag_directives.end) {
-            implicit = 0;
-            for (tag_directive = event->data.document_start.tag_directives.start;
-                    tag_directive != event->data.document_start.tag_directives.end;
-                    tag_directive ++) {
-                if (!yaml_emitter_write_indicator(emitter, "%TAG", 1, 0, 0))
-                    return 0;
-                if (!yaml_emitter_write_tag_handle(emitter, tag_directive->handle,
-                            strlen((char *)tag_directive->handle)))
-                    return 0;
-                if (!yaml_emitter_write_tag_content(emitter, tag_directive->prefix,
-                            strlen((char *)tag_directive->prefix), 1))
-                    return 0;
-                if (!yaml_emitter_write_indent(emitter))
-                    return 0;
-            }
-        }
-
-        if (yaml_emitter_check_empty_document(emitter)) {
-            implicit = 0;
-        }
-
-        if (!implicit) {
-            if (!yaml_emitter_write_indent(emitter))
-                return 0;
-            if (!yaml_emitter_write_indicator(emitter, "---", 1, 0, 0))
-                return 0;
-            if (emitter->canonical) {
-                if (!yaml_emitter_write_indent(emitter))
-                    return 0;
-            }
-        }
-
-        emitter->state = YAML_EMIT_DOCUMENT_CONTENT_STATE;
-
-        return 1;
-    }
-
-    else if (event->type == YAML_STREAM_END_EVENT)
-    {
-        if (emitter->open_ended)
-        {
-            if (!yaml_emitter_write_indicator(emitter, "...", 1, 0, 0))
-                return 0;
-            if (!yaml_emitter_write_indent(emitter))
-                return 0;
-        }
-
-        if (!yaml_emitter_flush(emitter))
-            return 0;
-
-        emitter->state = YAML_EMIT_END_STATE;
-
-        return 1;
-    }
-
-    return yaml_emitter_set_emitter_error(emitter,
-            "expected DOCUMENT-START or STREAM-END");
-}
-
-/*
- * Expect the root node.
- */
-
-static int
-yaml_emitter_emit_document_content(yaml_emitter_t *emitter,
-        yaml_event_t *event)
-{
-    if (!PUSH(emitter, emitter->states, YAML_EMIT_DOCUMENT_END_STATE))
-        return 0;
-
-    return yaml_emitter_emit_node(emitter, event, 1, 0, 0, 0);
-}
-
-/*
- * Expect DOCUMENT-END.
- */
-
-static int
-yaml_emitter_emit_document_end(yaml_emitter_t *emitter,
-        yaml_event_t *event)
-{
-    if (event->type == YAML_DOCUMENT_END_EVENT)
-    {
-        if (!yaml_emitter_write_indent(emitter))
-            return 0;
-        if (!event->data.document_end.implicit) {
-            if (!yaml_emitter_write_indicator(emitter, "...", 1, 0, 0))
-                return 0;
-            if (!yaml_emitter_write_indent(emitter))
-                return 0;
-        }
-        if (!yaml_emitter_flush(emitter))
-            return 0;
-
-        emitter->state = YAML_EMIT_DOCUMENT_START_STATE;
-
-        while (!STACK_EMPTY(emitter, emitter->tag_directives)) {
-            yaml_tag_directive_t tag_directive = POP(emitter,
-                    emitter->tag_directives);
-            yaml_free(tag_directive.handle);
-            yaml_free(tag_directive.prefix);
-        }
-
-        return 1;
-    }
-
-    return yaml_emitter_set_emitter_error(emitter,
-            "expected DOCUMENT-END");
-}
-
-/*
- * 
- * Expect a flow item node.
- */
-
-static int
-yaml_emitter_emit_flow_sequence_item(yaml_emitter_t *emitter,
-        yaml_event_t *event, int first)
-{
-    if (first)
-    {
-        if (!yaml_emitter_write_indicator(emitter, "[", 1, 1, 0))
-            return 0;
-        if (!yaml_emitter_increase_indent(emitter, 1, 0))
-            return 0;
-        emitter->flow_level ++;
-    }
-
-    if (event->type == YAML_SEQUENCE_END_EVENT)
-    {
-        emitter->flow_level --;
-        emitter->indent = POP(emitter, emitter->indents);
-        if (emitter->canonical && !first) {
-            if (!yaml_emitter_write_indicator(emitter, ",", 0, 0, 0))
-                return 0;
-            if (!yaml_emitter_write_indent(emitter))
-                return 0;
-        }
-        if (!yaml_emitter_write_indicator(emitter, "]", 0, 0, 0))
-            return 0;
-        emitter->state = POP(emitter, emitter->states);
-
-        return 1;
-    }
-
-    if (!first) {
-        if (!yaml_emitter_write_indicator(emitter, ",", 0, 0, 0))
-            return 0;
-    }
-
-    if (emitter->canonical || emitter->column > emitter->best_width) {
-        if (!yaml_emitter_write_indent(emitter))
-            return 0;
-    }
-    if (!PUSH(emitter, emitter->states, YAML_EMIT_FLOW_SEQUENCE_ITEM_STATE))
-        return 0;
-
-    return yaml_emitter_emit_node(emitter, event, 0, 1, 0, 0);
-}
-
-/*
- * Expect a flow key node.
- */
-
-static int
-yaml_emitter_emit_flow_mapping_key(yaml_emitter_t *emitter,
-        yaml_event_t *event, int first)
-{
-    if (first)
-    {
-        if (!yaml_emitter_write_indicator(emitter, "{", 1, 1, 0))
-            return 0;
-        if (!yaml_emitter_increase_indent(emitter, 1, 0))
-            return 0;
-        emitter->flow_level ++;
-    }
-
-    if (event->type == YAML_MAPPING_END_EVENT)
-    {
-        emitter->flow_level --;
-        emitter->indent = POP(emitter, emitter->indents);
-        if (emitter->canonical && !first) {
-            if (!yaml_emitter_write_indicator(emitter, ",", 0, 0, 0))
-                return 0;
-            if (!yaml_emitter_write_indent(emitter))
-                return 0;
-        }
-        if (!yaml_emitter_write_indicator(emitter, "}", 0, 0, 0))
-            return 0;
-        emitter->state = POP(emitter, emitter->states);
-
-        return 1;
-    }
-
-    if (!first) {
-        if (!yaml_emitter_write_indicator(emitter, ",", 0, 0, 0))
-            return 0;
-    }
-    if (emitter->canonical || emitter->column > emitter->best_width) {
-        if (!yaml_emitter_write_indent(emitter))
-            return 0;
-    }
-
-    if (!emitter->canonical && yaml_emitter_check_simple_key(emitter))
-    {
-        if (!PUSH(emitter, emitter->states,
-                    YAML_EMIT_FLOW_MAPPING_SIMPLE_VALUE_STATE))
-            return 0;
-
-        return yaml_emitter_emit_node(emitter, event, 0, 0, 1, 1);
-    }
-    else
-    {
-        if (!yaml_emitter_write_indicator(emitter, "?", 1, 0, 0))
-            return 0;
-        if (!PUSH(emitter, emitter->states,
-                    YAML_EMIT_FLOW_MAPPING_VALUE_STATE))
-            return 0;
-
-        return yaml_emitter_emit_node(emitter, event, 0, 0, 1, 0);
-    }
-}
-
-/*
- * Expect a flow value node.
- */
-
-static int
-yaml_emitter_emit_flow_mapping_value(yaml_emitter_t *emitter,
-        yaml_event_t *event, int simple)
-{
-    if (simple) {
-        if (!yaml_emitter_write_indicator(emitter, ":", 0, 0, 0))
-            return 0;
-    }
-    else {
-        if (emitter->canonical || emitter->column > emitter->best_width) {
-            if (!yaml_emitter_write_indent(emitter))
-                return 0;
-        }
-        if (!yaml_emitter_write_indicator(emitter, ":", 1, 0, 0))
-            return 0;
-    }
-    if (!PUSH(emitter, emitter->states, YAML_EMIT_FLOW_MAPPING_KEY_STATE))
-        return 0;
-    return yaml_emitter_emit_node(emitter, event, 0, 0, 1, 0);
-}
-
-/*
- * Expect a block item node.
- */
-
-static int
-yaml_emitter_emit_block_sequence_item(yaml_emitter_t *emitter,
-        yaml_event_t *event, int first)
-{
-    if (first)
-    {
-        if (!yaml_emitter_increase_indent(emitter, 0,
-                    (emitter->mapping_context && !emitter->indention)))
-            return 0;
-    }
-
-    if (event->type == YAML_SEQUENCE_END_EVENT)
-    {
-        emitter->indent = POP(emitter, emitter->indents);
-        emitter->state = POP(emitter, emitter->states);
-
-        return 1;
-    }
-
-    if (!yaml_emitter_write_indent(emitter))
-        return 0;
-    if (!yaml_emitter_write_indicator(emitter, "-", 1, 0, 1))
-        return 0;
-    if (!PUSH(emitter, emitter->states,
-                YAML_EMIT_BLOCK_SEQUENCE_ITEM_STATE))
-        return 0;
-
-    return yaml_emitter_emit_node(emitter, event, 0, 1, 0, 0);
-}
-
-/*
- * Expect a block key node.
- */
-
-static int
-yaml_emitter_emit_block_mapping_key(yaml_emitter_t *emitter,
-        yaml_event_t *event, int first)
-{
-    if (first)
-    {
-        if (!yaml_emitter_increase_indent(emitter, 0, 0))
-            return 0;
-    }
-
-    if (event->type == YAML_MAPPING_END_EVENT)
-    {
-        emitter->indent = POP(emitter, emitter->indents);
-        emitter->state = POP(emitter, emitter->states);
-
-        return 1;
-    }
-
-    if (!yaml_emitter_write_indent(emitter))
-        return 0;
-
-    if (yaml_emitter_check_simple_key(emitter))
-    {
-        if (!PUSH(emitter, emitter->states,
-                    YAML_EMIT_BLOCK_MAPPING_SIMPLE_VALUE_STATE))
-            return 0;
-
-        return yaml_emitter_emit_node(emitter, event, 0, 0, 1, 1);
-    }
-    else
-    {
-        if (!yaml_emitter_write_indicator(emitter, "?", 1, 0, 1))
-            return 0;
-        if (!PUSH(emitter, emitter->states,
-                    YAML_EMIT_BLOCK_MAPPING_VALUE_STATE))
-            return 0;
-
-        return yaml_emitter_emit_node(emitter, event, 0, 0, 1, 0);
-    }
-}
-
-/*
- * Expect a block value node.
- */
-
-static int
-yaml_emitter_emit_block_mapping_value(yaml_emitter_t *emitter,
-        yaml_event_t *event, int simple)
-{
-    if (simple) {
-        if (!yaml_emitter_write_indicator(emitter, ":", 0, 0, 0))
-            return 0;
-    }
-    else {
-        if (!yaml_emitter_write_indent(emitter))
-            return 0;
-        if (!yaml_emitter_write_indicator(emitter, ":", 1, 0, 1))
-            return 0;
-    }
-    if (!PUSH(emitter, emitter->states,
-                YAML_EMIT_BLOCK_MAPPING_KEY_STATE))
-        return 0;
-
-    return yaml_emitter_emit_node(emitter, event, 0, 0, 1, 0);
-}
-
-/*
- * Expect a node.
- */
-
-static int
-yaml_emitter_emit_node(yaml_emitter_t *emitter, yaml_event_t *event,
-        int root, int sequence, int mapping, int simple_key)
-{
-    emitter->root_context = root;
-    emitter->sequence_context = sequence;
-    emitter->mapping_context = mapping;
-    emitter->simple_key_context = simple_key;
-
-    switch (event->type)
-    {
-        case YAML_ALIAS_EVENT:
-            return yaml_emitter_emit_alias(emitter, event);
-
-        case YAML_SCALAR_EVENT:
-            return yaml_emitter_emit_scalar(emitter, event);
-
-        case YAML_SEQUENCE_START_EVENT:
-            return yaml_emitter_emit_sequence_start(emitter, event);
-
-        case YAML_MAPPING_START_EVENT:
-            return yaml_emitter_emit_mapping_start(emitter, event);
-
-        default:
-            return yaml_emitter_set_emitter_error(emitter,
-                    "expected SCALAR, SEQUENCE-START, MAPPING-START, or ALIAS");
-    }
-
-    return 0;
-}
-
-/*
- * Expect ALIAS.
- */
-
-static int
-yaml_emitter_emit_alias(yaml_emitter_t *emitter, yaml_event_t *event)
-{
-    if (!yaml_emitter_process_anchor(emitter))
-        return 0;
-    emitter->state = POP(emitter, emitter->states);
-
-    return 1;
-}
-
-/*
- * Expect SCALAR.
- */
-
-static int
-yaml_emitter_emit_scalar(yaml_emitter_t *emitter, yaml_event_t *event)
-{
-    if (!yaml_emitter_select_scalar_style(emitter, event))
-        return 0;
-    if (!yaml_emitter_process_anchor(emitter))
-        return 0;
-    if (!yaml_emitter_process_tag(emitter))
-        return 0;
-    if (!yaml_emitter_increase_indent(emitter, 1, 0))
-        return 0;
-    if (!yaml_emitter_process_scalar(emitter))
-        return 0;
-    emitter->indent = POP(emitter, emitter->indents);
-    emitter->state = POP(emitter, emitter->states);
-
-    return 1;
-}
-
-/*
- * Expect SEQUENCE-START.
- */
-
-static int
-yaml_emitter_emit_sequence_start(yaml_emitter_t *emitter, yaml_event_t *event)
-{
-    if (!yaml_emitter_process_anchor(emitter))
-        return 0;
-    if (!yaml_emitter_process_tag(emitter))
-        return 0;
-
-    if (emitter->flow_level || emitter->canonical
-            || event->data.sequence_start.style == YAML_FLOW_SEQUENCE_STYLE
-            || yaml_emitter_check_empty_sequence(emitter)) {
-        emitter->state = YAML_EMIT_FLOW_SEQUENCE_FIRST_ITEM_STATE;
-    }
-    else {
-        emitter->state = YAML_EMIT_BLOCK_SEQUENCE_FIRST_ITEM_STATE;
-    }
-
-    return 1;
-}
-
-/*
- * Expect MAPPING-START.
- */
-
-static int
-yaml_emitter_emit_mapping_start(yaml_emitter_t *emitter, yaml_event_t *event)
-{
-    if (!yaml_emitter_process_anchor(emitter))
-        return 0;
-    if (!yaml_emitter_process_tag(emitter))
-        return 0;
-
-    if (emitter->flow_level || emitter->canonical
-            || event->data.mapping_start.style == YAML_FLOW_MAPPING_STYLE
-            || yaml_emitter_check_empty_mapping(emitter)) {
-        emitter->state = YAML_EMIT_FLOW_MAPPING_FIRST_KEY_STATE;
-    }
-    else {
-        emitter->state = YAML_EMIT_BLOCK_MAPPING_FIRST_KEY_STATE;
-    }
-
-    return 1;
-}
-
-/*
- * Check if the document content is an empty scalar.
- */
-
-static int
-yaml_emitter_check_empty_document(yaml_emitter_t *emitter)
-{
-    return 0;
-}
-
-/*
- * Check if the next events represent an empty sequence.
- */
-
-static int
-yaml_emitter_check_empty_sequence(yaml_emitter_t *emitter)
-{
-    if (emitter->events.tail - emitter->events.head < 2)
-        return 0;
-
-    return (emitter->events.head[0].type == YAML_SEQUENCE_START_EVENT
-            && emitter->events.head[1].type == YAML_SEQUENCE_END_EVENT);
-}
-
-/*
- * Check if the next events represent an empty mapping.
- */
-
-static int
-yaml_emitter_check_empty_mapping(yaml_emitter_t *emitter)
-{
-    if (emitter->events.tail - emitter->events.head < 2)
-        return 0;
-
-    return (emitter->events.head[0].type == YAML_MAPPING_START_EVENT
-            && emitter->events.head[1].type == YAML_MAPPING_END_EVENT);
-}
-
-/*
- * Check if the next node can be expressed as a simple key.
- */
-
-static int
-yaml_emitter_check_simple_key(yaml_emitter_t *emitter)
-{
-    yaml_event_t *event = emitter->events.head;
-    size_t length = 0;
-
-    switch (event->type)
-    {
-        case YAML_ALIAS_EVENT:
-            length += emitter->anchor_data.anchor_length;
-            break;
-
-        case YAML_SCALAR_EVENT:
-            if (emitter->scalar_data.multiline)
-                return 0;
-            length += emitter->anchor_data.anchor_length
-                + emitter->tag_data.handle_length
-                + emitter->tag_data.suffix_length
-                + emitter->scalar_data.length;
-            break;
-
-        case YAML_SEQUENCE_START_EVENT:
-            if (!yaml_emitter_check_empty_sequence(emitter))
-                return 0;
-            length += emitter->anchor_data.anchor_length
-                + emitter->tag_data.handle_length
-                + emitter->tag_data.suffix_length;
-            break;
-
-        case YAML_MAPPING_START_EVENT:
-            if (!yaml_emitter_check_empty_mapping(emitter))
-                return 0;
-            length += emitter->anchor_data.anchor_length
-                + emitter->tag_data.handle_length
-                + emitter->tag_data.suffix_length;
-            break;
-
-        default:
-            return 0;
-    }
-
-    if (length > 128)
-        return 0;
-
-    return 1;
-}
-
-/*
- * Determine an acceptable scalar style.
- */
-
-static int
-yaml_emitter_select_scalar_style(yaml_emitter_t *emitter, yaml_event_t *event)
-{
-    yaml_scalar_style_t style = event->data.scalar.style;
-    int no_tag = (!emitter->tag_data.handle && !emitter->tag_data.suffix);
-
-    if (no_tag && !event->data.scalar.plain_implicit
-            && !event->data.scalar.quoted_implicit) {
-        return yaml_emitter_set_emitter_error(emitter,
-                "neither tag nor implicit flags are specified");
-    }
-
-    if (style == YAML_ANY_SCALAR_STYLE)
-        style = YAML_PLAIN_SCALAR_STYLE;
-
-    if (emitter->canonical)
-        style = YAML_DOUBLE_QUOTED_SCALAR_STYLE;
-
-    if (emitter->simple_key_context && emitter->scalar_data.multiline)
-        style = YAML_DOUBLE_QUOTED_SCALAR_STYLE;
-
-    if (style == YAML_PLAIN_SCALAR_STYLE)
-    {
-        if ((emitter->flow_level && !emitter->scalar_data.flow_plain_allowed)
-                || (!emitter->flow_level && !emitter->scalar_data.block_plain_allowed))
-            style = YAML_SINGLE_QUOTED_SCALAR_STYLE;
-        if (!emitter->scalar_data.length
-                && (emitter->flow_level || emitter->simple_key_context))
-            style = YAML_SINGLE_QUOTED_SCALAR_STYLE;
-        if (no_tag && !event->data.scalar.plain_implicit)
-            style = YAML_SINGLE_QUOTED_SCALAR_STYLE;
-    }
-
-    if (style == YAML_SINGLE_QUOTED_SCALAR_STYLE)
-    {
-        if (!emitter->scalar_data.single_quoted_allowed)
-            style = YAML_DOUBLE_QUOTED_SCALAR_STYLE;
-    }
-
-    if (style == YAML_LITERAL_SCALAR_STYLE || style == YAML_FOLDED_SCALAR_STYLE)
-    {
-        if (!emitter->scalar_data.block_allowed
-                || emitter->flow_level || emitter->simple_key_context)
-            style = YAML_DOUBLE_QUOTED_SCALAR_STYLE;
-    }
-
-    if (no_tag && !event->data.scalar.quoted_implicit
-            && style != YAML_PLAIN_SCALAR_STYLE)
-    {
-        emitter->tag_data.handle = (yaml_char_t *)"!";
-        emitter->tag_data.handle_length = 1;
-    }
-
-    emitter->scalar_data.style = style;
-
-    return 1;
-}
-
-/*
- * Write an achor.
- */
-
-static int
-yaml_emitter_process_anchor(yaml_emitter_t *emitter)
-{
-    if (!emitter->anchor_data.anchor)
-        return 1;
-
-    if (!yaml_emitter_write_indicator(emitter,
-                (emitter->anchor_data.alias ? "*" : "&"), 1, 0, 0))
-        return 0;
-
-    return yaml_emitter_write_anchor(emitter,
-            emitter->anchor_data.anchor, emitter->anchor_data.anchor_length);
-}
-
-/*
- * Write a tag.
- */
-
-static int
-yaml_emitter_process_tag(yaml_emitter_t *emitter)
-{
-    if (!emitter->tag_data.handle && !emitter->tag_data.suffix)
-        return 1;
-
-    if (emitter->tag_data.handle)
-    {
-        if (!yaml_emitter_write_tag_handle(emitter, emitter->tag_data.handle,
-                    emitter->tag_data.handle_length))
-            return 0;
-        if (emitter->tag_data.suffix) {
-            if (!yaml_emitter_write_tag_content(emitter, emitter->tag_data.suffix,
-                        emitter->tag_data.suffix_length, 0))
-                return 0;
-        }
-    }
-    else
-    {
-        if (!yaml_emitter_write_indicator(emitter, "!<", 1, 0, 0))
-            return 0;
-        if (!yaml_emitter_write_tag_content(emitter, emitter->tag_data.suffix,
-                    emitter->tag_data.suffix_length, 0))
-            return 0;
-        if (!yaml_emitter_write_indicator(emitter, ">", 0, 0, 0))
-            return 0;
-    }
-
-    return 1;
-}
-
-/*
- * Write a scalar.
- */
-
-static int
-yaml_emitter_process_scalar(yaml_emitter_t *emitter)
-{
-    switch (emitter->scalar_data.style)
-    {
-        case YAML_PLAIN_SCALAR_STYLE:
-            return yaml_emitter_write_plain_scalar(emitter,
-                    emitter->scalar_data.value, emitter->scalar_data.length,
-                    !emitter->simple_key_context);
-
-        case YAML_SINGLE_QUOTED_SCALAR_STYLE:
-            return yaml_emitter_write_single_quoted_scalar(emitter,
-                    emitter->scalar_data.value, emitter->scalar_data.length,
-                    !emitter->simple_key_context);
-
-        case YAML_DOUBLE_QUOTED_SCALAR_STYLE:
-            return yaml_emitter_write_double_quoted_scalar(emitter,
-                    emitter->scalar_data.value, emitter->scalar_data.length,
-                    !emitter->simple_key_context);
-
-        case YAML_LITERAL_SCALAR_STYLE:
-            return yaml_emitter_write_literal_scalar(emitter,
-                    emitter->scalar_data.value, emitter->scalar_data.length);
-
-        case YAML_FOLDED_SCALAR_STYLE:
-            return yaml_emitter_write_folded_scalar(emitter,
-                    emitter->scalar_data.value, emitter->scalar_data.length);
-
-        default:
-            assert(1);      /* Impossible. */
-    }
-
-    return 0;
-}
-
-/*
- * Check if a %YAML directive is valid.
- */
-
-static int
-yaml_emitter_analyze_version_directive(yaml_emitter_t *emitter,
-        yaml_version_directive_t version_directive)
-{
-    if (version_directive.major != 1 || version_directive.minor != 1) {
-        return yaml_emitter_set_emitter_error(emitter,
-                "incompatible %YAML directive");
-    }
-
-    return 1;
-}
-
-/*
- * Check if a %TAG directive is valid.
- */
-
-static int
-yaml_emitter_analyze_tag_directive(yaml_emitter_t *emitter,
-        yaml_tag_directive_t tag_directive)
-{
-    yaml_string_t handle;
-    yaml_string_t prefix;
-    size_t handle_length;
-    size_t prefix_length;
-
-    handle_length = strlen((char *)tag_directive.handle);
-    prefix_length = strlen((char *)tag_directive.prefix);
-    STRING_ASSIGN(handle, tag_directive.handle, handle_length);
-    STRING_ASSIGN(prefix, tag_directive.prefix, prefix_length);
-
-    if (handle.start == handle.end) {
-        return yaml_emitter_set_emitter_error(emitter,
-                "tag handle must not be empty");
-    }
-
-    if (handle.start[0] != '!') {
-        return yaml_emitter_set_emitter_error(emitter,
-                "tag handle must start with '!'");
-    }
-
-    if (handle.end[-1] != '!') {
-        return yaml_emitter_set_emitter_error(emitter,
-                "tag handle must end with '!'");
-    }
-
-    handle.pointer ++;
-
-    while (handle.pointer < handle.end-1) {
-        if (!IS_ALPHA(handle)) {
-            return yaml_emitter_set_emitter_error(emitter,
-                    "tag handle must contain alphanumerical characters only");
-        }
-        MOVE(handle);
-    }
-
-    if (prefix.start == prefix.end) {
-        return yaml_emitter_set_emitter_error(emitter,
-                "tag prefix must not be empty");
-    }
-
-    return 1;
-}
-
-/*
- * Check if an anchor is valid.
- */
-
-static int
-yaml_emitter_analyze_anchor(yaml_emitter_t *emitter,
-        yaml_char_t *anchor, int alias)
-{
-    size_t anchor_length;
-    yaml_string_t string;
-    
-    anchor_length = strlen((char *)anchor);
-    STRING_ASSIGN(string, anchor, anchor_length);
-
-    if (string.start == string.end) {
-        return yaml_emitter_set_emitter_error(emitter, alias ?
-                "alias value must not be empty" :
-                "anchor value must not be empty");
-    }
-
-    while (string.pointer != string.end) {
-        if (!IS_ALPHA(string)) {
-            return yaml_emitter_set_emitter_error(emitter, alias ?
-                    "alias value must contain alphanumerical characters only" :
-                    "anchor value must contain alphanumerical characters only");
-        }
-        MOVE(string);
-    }
-
-    emitter->anchor_data.anchor = string.start;
-    emitter->anchor_data.anchor_length = string.end - string.start;
-    emitter->anchor_data.alias = alias;
-
-    return 1;
-}
-
-/*
- * Check if a tag is valid.
- */
-
-static int
-yaml_emitter_analyze_tag(yaml_emitter_t *emitter,
-        yaml_char_t *tag)
-{
-    size_t tag_length;
-    yaml_string_t string;
-    yaml_tag_directive_t *tag_directive;
-
-    tag_length = strlen((char *)tag);
-    STRING_ASSIGN(string, tag, tag_length);
-
-    if (string.start == string.end) {
-        return yaml_emitter_set_emitter_error(emitter,
-                "tag value must not be empty");
-    }
-
-    for (tag_directive = emitter->tag_directives.start;
-            tag_directive != emitter->tag_directives.top; tag_directive ++) {
-        size_t prefix_length = strlen((char *)tag_directive->prefix);
-        if (prefix_length < (size_t)(string.end - string.start)
-                && strncmp((char *)tag_directive->prefix, (char *)string.start,
-                    prefix_length) == 0)
-        {
-            emitter->tag_data.handle = tag_directive->handle;
-            emitter->tag_data.handle_length =
-                strlen((char *)tag_directive->handle);
-            emitter->tag_data.suffix = string.start + prefix_length;
-            emitter->tag_data.suffix_length =
-                (string.end - string.start) - prefix_length;
-            return 1;
-        }
-    }
-
-    emitter->tag_data.suffix = string.start;
-    emitter->tag_data.suffix_length = string.end - string.start;
-
-    return 1;
-}
-
-/*
- * Check if a scalar is valid.
- */
-
-static int
-yaml_emitter_analyze_scalar(yaml_emitter_t *emitter,
-        yaml_char_t *value, size_t length)
-{
-    yaml_string_t string;
-
-    int block_indicators = 0;
-    int flow_indicators = 0;
-    int line_breaks = 0;
-    int special_characters = 0;
-
-    int leading_space = 0;
-    int leading_break = 0;
-    int trailing_space = 0;
-    int trailing_break = 0;
-    int break_space = 0;
-    int space_break = 0;
-
-    int preceeded_by_whitespace = 0;
-    int followed_by_whitespace = 0;
-    int previous_space = 0;
-    int previous_break = 0;
-
-    STRING_ASSIGN(string, value, length);
-
-    emitter->scalar_data.value = value;
-    emitter->scalar_data.length = length;
-
-    if (string.start == string.end)
-    {
-        emitter->scalar_data.multiline = 0;
-        emitter->scalar_data.flow_plain_allowed = 0;
-        emitter->scalar_data.block_plain_allowed = 1;
-        emitter->scalar_data.single_quoted_allowed = 1;
-        emitter->scalar_data.block_allowed = 0;
-
-        return 1;
-    }
-
-    if ((CHECK_AT(string, '-', 0)
-                && CHECK_AT(string, '-', 1)
-                && CHECK_AT(string, '-', 2))
-            || (CHECK_AT(string, '.', 0)
-                && CHECK_AT(string, '.', 1)
-                && CHECK_AT(string, '.', 2))) {
-        block_indicators = 1;
-        flow_indicators = 1;
-    }
-
-    preceeded_by_whitespace = 1;
-    followed_by_whitespace = IS_BLANKZ_AT(string, WIDTH(string));
-
-    while (string.pointer != string.end)
-    {
-        if (string.start == string.pointer)
-        {
-            if (CHECK(string, '#') || CHECK(string, ',')
-                    || CHECK(string, '[') || CHECK(string, ']')
-                    || CHECK(string, '{') || CHECK(string, '}')
-                    || CHECK(string, '&') || CHECK(string, '*')
-                    || CHECK(string, '!') || CHECK(string, '|')
-                    || CHECK(string, '>') || CHECK(string, '\'')
-                    || CHECK(string, '"') || CHECK(string, '%')
-                    || CHECK(string, '@') || CHECK(string, '`')) {
-                flow_indicators = 1;
-                block_indicators = 1;
-            }
-
-            if (CHECK(string, '?') || CHECK(string, ':')) {
-                flow_indicators = 1;
-                if (followed_by_whitespace) {
-                    block_indicators = 1;
-                }
-            }
-
-            if (CHECK(string, '-') && followed_by_whitespace) {
-                flow_indicators = 1;
-                block_indicators = 1;
-            }
-        }
-        else
-        {
-            if (CHECK(string, ',') || CHECK(string, '?')
-                    || CHECK(string, '[') || CHECK(string, ']')
-                    || CHECK(string, '{') || CHECK(string, '}')) {
-                flow_indicators = 1;
-            }
-
-            if (CHECK(string, ':')) {
-                flow_indicators = 1;
-                if (followed_by_whitespace) {
-                    block_indicators = 1;
-                }
-            }
-
-            if (CHECK(string, '#') && preceeded_by_whitespace) {
-                flow_indicators = 1;
-                block_indicators = 1;
-            }
-        }
-
-        if (!IS_PRINTABLE(string)
-                || (!IS_ASCII(string) && !emitter->unicode)) {
-            special_characters = 1;
-        }
-
-        if (IS_BREAK(string)) {
-            line_breaks = 1;
-        }
-
-        if (IS_SPACE(string))
-        {
-            if (string.start == string.pointer) {
-                leading_space = 1;
-            }
-            if (string.pointer+WIDTH(string) == string.end) {
-                trailing_space = 1;
-            }
-            if (previous_break) {
-                break_space = 1;
-            }
-            previous_space = 1;
-            previous_break = 0;
-        }
-        else if (IS_BREAK(string))
-        {
-            if (string.start == string.pointer) {
-                leading_break = 1;
-            }
-            if (string.pointer+WIDTH(string) == string.end) {
-                trailing_break = 1;
-            }
-            if (previous_space) {
-                space_break = 1;
-            }
-            previous_space = 0;
-            previous_break = 1;
-        }
-        else
-        {
-            previous_space = 0;
-            previous_break = 0;
-        }
-
-        preceeded_by_whitespace = IS_BLANKZ(string);
-        MOVE(string);
-        if (string.pointer != string.end) {
-            followed_by_whitespace = IS_BLANKZ_AT(string, WIDTH(string));
-        }
-    }
-
-    emitter->scalar_data.multiline = line_breaks;
-
-    emitter->scalar_data.flow_plain_allowed = 1;
-    emitter->scalar_data.block_plain_allowed = 1;
-    emitter->scalar_data.single_quoted_allowed = 1;
-    emitter->scalar_data.block_allowed = 1;
-
-    if (leading_space || leading_break || trailing_space || trailing_break) {
-        emitter->scalar_data.flow_plain_allowed = 0;
-        emitter->scalar_data.block_plain_allowed = 0;
-    }
-
-    if (trailing_space) {
-        emitter->scalar_data.block_allowed = 0;
-    }
-
-    if (break_space) {
-        emitter->scalar_data.flow_plain_allowed = 0;
-        emitter->scalar_data.block_plain_allowed = 0;
-        emitter->scalar_data.single_quoted_allowed = 0;
-    }
-
-    if (space_break || special_characters) {
-        emitter->scalar_data.flow_plain_allowed = 0;
-        emitter->scalar_data.block_plain_allowed = 0;
-        emitter->scalar_data.single_quoted_allowed = 0;
-        emitter->scalar_data.block_allowed = 0;
-    }
-
-    if (line_breaks) {
-        emitter->scalar_data.flow_plain_allowed = 0;
-        emitter->scalar_data.block_plain_allowed = 0;
-    }
-
-    if (flow_indicators) {
-        emitter->scalar_data.flow_plain_allowed = 0;
-    }
-
-    if (block_indicators) {
-        emitter->scalar_data.block_plain_allowed = 0;
-    }
-
-    return 1;
-}
-
-/*
- * Check if the event data is valid.
- */
-
-static int
-yaml_emitter_analyze_event(yaml_emitter_t *emitter,
-        yaml_event_t *event)
-{
-    emitter->anchor_data.anchor = NULL;
-    emitter->anchor_data.anchor_length = 0;
-    emitter->tag_data.handle = NULL;
-    emitter->tag_data.handle_length = 0;
-    emitter->tag_data.suffix = NULL;
-    emitter->tag_data.suffix_length = 0;
-    emitter->scalar_data.value = NULL;
-    emitter->scalar_data.length = 0;
-
-    switch (event->type)
-    {
-        case YAML_ALIAS_EVENT:
-            if (!yaml_emitter_analyze_anchor(emitter,
-                        event->data.alias.anchor, 1))
-                return 0;
-            return 1;
-
-        case YAML_SCALAR_EVENT:
-            if (event->data.scalar.anchor) {
-                if (!yaml_emitter_analyze_anchor(emitter,
-                            event->data.scalar.anchor, 0))
-                    return 0;
-            }
-            if (event->data.scalar.tag && (emitter->canonical ||
-                        (!event->data.scalar.plain_implicit
-                         && !event->data.scalar.quoted_implicit))) {
-                if (!yaml_emitter_analyze_tag(emitter, event->data.scalar.tag))
-                    return 0;
-            }
-            if (!yaml_emitter_analyze_scalar(emitter,
-                        event->data.scalar.value, event->data.scalar.length))
-                return 0;
-            return 1;
-
-        case YAML_SEQUENCE_START_EVENT:
-            if (event->data.sequence_start.anchor) {
-                if (!yaml_emitter_analyze_anchor(emitter,
-                            event->data.sequence_start.anchor, 0))
-                    return 0;
-            }
-            if (event->data.sequence_start.tag && (emitter->canonical ||
-                        !event->data.sequence_start.implicit)) {
-                if (!yaml_emitter_analyze_tag(emitter,
-                            event->data.sequence_start.tag))
-                    return 0;
-            }
-            return 1;
-
-        case YAML_MAPPING_START_EVENT:
-            if (event->data.mapping_start.anchor) {
-                if (!yaml_emitter_analyze_anchor(emitter,
-                            event->data.mapping_start.anchor, 0))
-                    return 0;
-            }
-            if (event->data.mapping_start.tag && (emitter->canonical ||
-                        !event->data.mapping_start.implicit)) {
-                if (!yaml_emitter_analyze_tag(emitter,
-                            event->data.mapping_start.tag))
-                    return 0;
-            }
-            return 1;
-
-        default:
-            return 1;
-    }
-}
-
-/*
- * Write the BOM character.
- */
-
-static int
-yaml_emitter_write_bom(yaml_emitter_t *emitter)
-{
-    if (!FLUSH(emitter)) return 0;
-
-    *(emitter->buffer.pointer++) = (yaml_char_t) '\xEF';
-    *(emitter->buffer.pointer++) = (yaml_char_t) '\xBB';
-    *(emitter->buffer.pointer++) = (yaml_char_t) '\xBF';
-
-    return 1;
-}
-
-static int
-yaml_emitter_write_indent(yaml_emitter_t *emitter)
-{
-    int indent = (emitter->indent >= 0) ? emitter->indent : 0;
-
-    if (!emitter->indention || emitter->column > indent
-            || (emitter->column == indent && !emitter->whitespace)) {
-        if (!PUT_BREAK(emitter)) return 0;
-    }
-
-    while (emitter->column < indent) {
-        if (!PUT(emitter, ' ')) return 0;
-    }
-
-    emitter->whitespace = 1;
-    emitter->indention = 1;
-
-    return 1;
-}
-
-static int
-yaml_emitter_write_indicator(yaml_emitter_t *emitter,
-        char *indicator, int need_whitespace,
-        int is_whitespace, int is_indention)
-{
-    size_t indicator_length;
-    yaml_string_t string;
-
-    indicator_length = strlen(indicator);
-    STRING_ASSIGN(string, (yaml_char_t *)indicator, indicator_length);
-
-    if (need_whitespace && !emitter->whitespace) {
-        if (!PUT(emitter, ' ')) return 0;
-    }
-
-    while (string.pointer != string.end) {
-        if (!WRITE(emitter, string)) return 0;
-    }
-
-    emitter->whitespace = is_whitespace;
-    emitter->indention = (emitter->indention && is_indention);
-    emitter->open_ended = 0;
-
-    return 1;
-}
-
-static int
-yaml_emitter_write_anchor(yaml_emitter_t *emitter,
-        yaml_char_t *value, size_t length)
-{
-    yaml_string_t string;
-    STRING_ASSIGN(string, value, length);
-
-    while (string.pointer != string.end) {
-        if (!WRITE(emitter, string)) return 0;
-    }
-
-    emitter->whitespace = 0;
-    emitter->indention = 0;
-
-    return 1;
-}
-
-static int
-yaml_emitter_write_tag_handle(yaml_emitter_t *emitter,
-        yaml_char_t *value, size_t length)
-{
-    yaml_string_t string;
-    STRING_ASSIGN(string, value, length);
-
-    if (!emitter->whitespace) {
-        if (!PUT(emitter, ' ')) return 0;
-    }
-
-    while (string.pointer != string.end) {
-        if (!WRITE(emitter, string)) return 0;
-    }
-
-    emitter->whitespace = 0;
-    emitter->indention = 0;
-
-    return 1;
-}
-
-static int
-yaml_emitter_write_tag_content(yaml_emitter_t *emitter,
-        yaml_char_t *value, size_t length,
-        int need_whitespace)
-{
-    yaml_string_t string;
-    STRING_ASSIGN(string, value, length);
-
-    if (need_whitespace && !emitter->whitespace) {
-        if (!PUT(emitter, ' ')) return 0;
-    }
-
-    while (string.pointer != string.end) {
-        if (IS_ALPHA(string)
-                || CHECK(string, ';') || CHECK(string, '/')
-                || CHECK(string, '?') || CHECK(string, ':')
-                || CHECK(string, '@') || CHECK(string, '&')
-                || CHECK(string, '=') || CHECK(string, '+')
-                || CHECK(string, '$') || CHECK(string, ',')
-                || CHECK(string, '_') || CHECK(string, '.')
-                || CHECK(string, '~') || CHECK(string, '*')
-                || CHECK(string, '\'') || CHECK(string, '(')
-                || CHECK(string, ')') || CHECK(string, '[')
-                || CHECK(string, ']')) {
-            if (!WRITE(emitter, string)) return 0;
-        }
-        else {
-            int width = WIDTH(string);
-            unsigned int value;
-            while (width --) {
-                value = *(string.pointer++);
-                if (!PUT(emitter, '%')) return 0;
-                if (!PUT(emitter, (value >> 4)
-                            + ((value >> 4) < 10 ? '0' : 'A' - 10)))
-                    return 0;
-                if (!PUT(emitter, (value & 0x0F)
-                            + ((value & 0x0F) < 10 ? '0' : 'A' - 10)))
-                    return 0;
-            }
-        }
-    }
-
-    emitter->whitespace = 0;
-    emitter->indention = 0;
-
-    return 1;
-}
-
-static int
-yaml_emitter_write_plain_scalar(yaml_emitter_t *emitter,
-        yaml_char_t *value, size_t length, int allow_breaks)
-{
-    yaml_string_t string;
-    int spaces = 0;
-    int breaks = 0;
-
-    STRING_ASSIGN(string, value, length);
-
-    if (!emitter->whitespace) {
-        if (!PUT(emitter, ' ')) return 0;
-    }
-
-    while (string.pointer != string.end)
-    {
-        if (IS_SPACE(string))
-        {
-            if (allow_breaks && !spaces
-                    && emitter->column > emitter->best_width
-                    && !IS_SPACE_AT(string, 1)) {
-                if (!yaml_emitter_write_indent(emitter)) return 0;
-                MOVE(string);
-            }
-            else {
-                if (!WRITE(emitter, string)) return 0;
-            }
-            spaces = 1;
-        }
-        else if (IS_BREAK(string))
-        {
-            if (!breaks && CHECK(string, '\n')) {
-                if (!PUT_BREAK(emitter)) return 0;
-            }
-            if (!WRITE_BREAK(emitter, string)) return 0;
-            emitter->indention = 1;
-            breaks = 1;
-        }
-        else
-        {
-            if (breaks) {
-                if (!yaml_emitter_write_indent(emitter)) return 0;
-            }
-            if (!WRITE(emitter, string)) return 0;
-            emitter->indention = 0;
-            spaces = 0;
-            breaks = 0;
-        }
-    }
-
-    emitter->whitespace = 0;
-    emitter->indention = 0;
-    if (emitter->root_context)
-    {
-        emitter->open_ended = 1;
-    }
-
-    return 1;
-}
-
-static int
-yaml_emitter_write_single_quoted_scalar(yaml_emitter_t *emitter,
-        yaml_char_t *value, size_t length, int allow_breaks)
-{
-    yaml_string_t string;
-    int spaces = 0;
-    int breaks = 0;
-
-    STRING_ASSIGN(string, value, length);
-
-    if (!yaml_emitter_write_indicator(emitter, "'", 1, 0, 0))
-        return 0;
-
-    while (string.pointer != string.end)
-    {
-        if (IS_SPACE(string))
-        {
-            if (allow_breaks && !spaces
-                    && emitter->column > emitter->best_width
-                    && string.pointer != string.start
-                    && string.pointer != string.end - 1
-                    && !IS_SPACE_AT(string, 1)) {
-                if (!yaml_emitter_write_indent(emitter)) return 0;
-                MOVE(string);
-            }
-            else {
-                if (!WRITE(emitter, string)) return 0;
-            }
-            spaces = 1;
-        }
-        else if (IS_BREAK(string))
-        {
-            if (!breaks && CHECK(string, '\n')) {
-                if (!PUT_BREAK(emitter)) return 0;
-            }
-            if (!WRITE_BREAK(emitter, string)) return 0;
-            emitter->indention = 1;
-            breaks = 1;
-        }
-        else
-        {
-            if (breaks) {
-                if (!yaml_emitter_write_indent(emitter)) return 0;
-            }
-            if (CHECK(string, '\'')) {
-                if (!PUT(emitter, '\'')) return 0;
-            }
-            if (!WRITE(emitter, string)) return 0;
-            emitter->indention = 0;
-            spaces = 0;
-            breaks = 0;
-        }
-    }
-
-    if (!yaml_emitter_write_indicator(emitter, "'", 0, 0, 0))
-        return 0;
-
-    emitter->whitespace = 0;
-    emitter->indention = 0;
-
-    return 1;
-}
-
-static int
-yaml_emitter_write_double_quoted_scalar(yaml_emitter_t *emitter,
-        yaml_char_t *value, size_t length, int allow_breaks)
-{
-    yaml_string_t string;
-    int spaces = 0;
-
-    STRING_ASSIGN(string, value, length);
-
-    if (!yaml_emitter_write_indicator(emitter, "\"", 1, 0, 0))
-        return 0;
-
-    while (string.pointer != string.end)
-    {
-        if (!IS_PRINTABLE(string) || (!emitter->unicode && !IS_ASCII(string))
-                || IS_BOM(string) || IS_BREAK(string)
-                || CHECK(string, '"') || CHECK(string, '\\'))
-        {
-            unsigned char octet;
-            unsigned int width;
-            unsigned int value;
-            int k;
-
-            octet = string.pointer[0];
-            width = (octet & 0x80) == 0x00 ? 1 :
-                    (octet & 0xE0) == 0xC0 ? 2 :
-                    (octet & 0xF0) == 0xE0 ? 3 :
-                    (octet & 0xF8) == 0xF0 ? 4 : 0;
-            value = (octet & 0x80) == 0x00 ? octet & 0x7F :
-                    (octet & 0xE0) == 0xC0 ? octet & 0x1F :
-                    (octet & 0xF0) == 0xE0 ? octet & 0x0F :
-                    (octet & 0xF8) == 0xF0 ? octet & 0x07 : 0;
-            for (k = 1; k < (int)width; k ++) {
-                octet = string.pointer[k];
-                value = (value << 6) + (octet & 0x3F);
-            }
-            string.pointer += width;
-
-            if (!PUT(emitter, '\\')) return 0;
-
-            switch (value)
-            {
-                case 0x00:
-                    if (!PUT(emitter, '0')) return 0;
-                    break;
-
-                case 0x07:
-                    if (!PUT(emitter, 'a')) return 0;
-                    break;
-
-                case 0x08:
-                    if (!PUT(emitter, 'b')) return 0;
-                    break;
-
-                case 0x09:
-                    if (!PUT(emitter, 't')) return 0;
-                    break;
-
-                case 0x0A:
-                    if (!PUT(emitter, 'n')) return 0;
-                    break;
-
-                case 0x0B:
-                    if (!PUT(emitter, 'v')) return 0;
-                    break;
-
-                case 0x0C:
-                    if (!PUT(emitter, 'f')) return 0;
-                    break;
-
-                case 0x0D:
-                    if (!PUT(emitter, 'r')) return 0;
-                    break;
-
-                case 0x1B:
-                    if (!PUT(emitter, 'e')) return 0;
-                    break;
-
-                case 0x22:
-                    if (!PUT(emitter, '\"')) return 0;
-                    break;
-
-                case 0x5C:
-                    if (!PUT(emitter, '\\')) return 0;
-                    break;
-
-                case 0x85:
-                    if (!PUT(emitter, 'N')) return 0;
-                    break;
-
-                case 0xA0:
-                    if (!PUT(emitter, '_')) return 0;
-                    break;
-
-                case 0x2028:
-                    if (!PUT(emitter, 'L')) return 0;
-                    break;
-
-                case 0x2029:
-                    if (!PUT(emitter, 'P')) return 0;
-                    break;
-
-                default:
-                    if (value <= 0xFF) {
-                        if (!PUT(emitter, 'x')) return 0;
-                        width = 2;
-                    }
-                    else if (value <= 0xFFFF) {
-                        if (!PUT(emitter, 'u')) return 0;
-                        width = 4;
-                    }
-                    else {
-                        if (!PUT(emitter, 'U')) return 0;
-                        width = 8;
-                    }
-                    for (k = (width-1)*4; k >= 0; k -= 4) {
-                        int digit = (value >> k) & 0x0F;
-                        if (!PUT(emitter, digit + (digit < 10 ? '0' : 'A'-10)))
-                            return 0;
-                    }
-            }
-            spaces = 0;
-        }
-        else if (IS_SPACE(string))
-        {
-            if (allow_breaks && !spaces
-                    && emitter->column > emitter->best_width
-                    && string.pointer != string.start
-                    && string.pointer != string.end - 1) {
-                if (!yaml_emitter_write_indent(emitter)) return 0;
-                if (IS_SPACE_AT(string, 1)) {
-                    if (!PUT(emitter, '\\')) return 0;
-                }
-                MOVE(string);
-            }
-            else {
-                if (!WRITE(emitter, string)) return 0;
-            }
-            spaces = 1;
-        }
-        else
-        {
-            if (!WRITE(emitter, string)) return 0;
-            spaces = 0;
-        }
-    }
-
-    if (!yaml_emitter_write_indicator(emitter, "\"", 0, 0, 0))
-        return 0;
-
-    emitter->whitespace = 0;
-    emitter->indention = 0;
-
-    return 1;
-}
-
-static int
-yaml_emitter_write_block_scalar_hints(yaml_emitter_t *emitter,
-        yaml_string_t string)
-{
-    char indent_hint[2];
-    char *chomp_hint = NULL;
-
-    if (IS_SPACE(string) || IS_BREAK(string))
-    {
-        indent_hint[0] = '0' + (char)emitter->best_indent;
-        indent_hint[1] = '\0';
-        if (!yaml_emitter_write_indicator(emitter, indent_hint, 0, 0, 0))
-            return 0;
-    }
-
-    emitter->open_ended = 0;
-
-    string.pointer = string.end;
-    if (string.start == string.pointer)
-    {
-        chomp_hint = "-";
-    }
-    else
-    {
-        do {
-            string.pointer --;
-        } while ((*string.pointer & 0xC0) == 0x80);
-        if (!IS_BREAK(string))
-        {
-            chomp_hint = "-";
-        }
-        else if (string.start == string.pointer)
-        {
-            chomp_hint = "+";
-            emitter->open_ended = 1;
-        }
-        else
-        {
-            do {
-                string.pointer --;
-            } while ((*string.pointer & 0xC0) == 0x80);
-            if (IS_BREAK(string))
-            {
-                chomp_hint = "+";
-                emitter->open_ended = 1;
-            }
-        }
-    }
-
-    if (chomp_hint)
-    {
-        if (!yaml_emitter_write_indicator(emitter, chomp_hint, 0, 0, 0))
-            return 0;
-    }
-
-    return 1;
-}
-
-static int
-yaml_emitter_write_literal_scalar(yaml_emitter_t *emitter,
-        yaml_char_t *value, size_t length)
-{
-    yaml_string_t string;
-    int breaks = 1;
-
-    STRING_ASSIGN(string, value, length);
-
-    if (!yaml_emitter_write_indicator(emitter, "|", 1, 0, 0))
-        return 0;
-    if (!yaml_emitter_write_block_scalar_hints(emitter, string))
-        return 0;
-    if (!PUT_BREAK(emitter)) return 0;
-    emitter->indention = 1;
-    emitter->whitespace = 1;
-
-    while (string.pointer != string.end)
-    {
-        if (IS_BREAK(string))
-        {
-            if (!WRITE_BREAK(emitter, string)) return 0;
-            emitter->indention = 1;
-            breaks = 1;
-        }
-        else
-        {
-            if (breaks) {
-                if (!yaml_emitter_write_indent(emitter)) return 0;
-            }
-            if (!WRITE(emitter, string)) return 0;
-            emitter->indention = 0;
-            breaks = 0;
-        }
-    }
-
-    return 1;
-}
-
-static int
-yaml_emitter_write_folded_scalar(yaml_emitter_t *emitter,
-        yaml_char_t *value, size_t length)
-{
-    yaml_string_t string;
-    int breaks = 1;
-    int leading_spaces = 1;
-
-    STRING_ASSIGN(string, value, length);
-
-    if (!yaml_emitter_write_indicator(emitter, ">", 1, 0, 0))
-        return 0;
-    if (!yaml_emitter_write_block_scalar_hints(emitter, string))
-        return 0;
-    if (!PUT_BREAK(emitter)) return 0;
-    emitter->indention = 1;
-    emitter->whitespace = 1;
-
-    while (string.pointer != string.end)
-    {
-        if (IS_BREAK(string))
-        {
-            if (!breaks && !leading_spaces && CHECK(string, '\n')) {
-                int k = 0;
-                while (IS_BREAK_AT(string, k)) {
-                    k += WIDTH_AT(string, k);
-                }
-                if (!IS_BLANKZ_AT(string, k)) {
-                    if (!PUT_BREAK(emitter)) return 0;
-                }
-            }
-            if (!WRITE_BREAK(emitter, string)) return 0;
-            emitter->indention = 1;
-            breaks = 1;
-        }
-        else
-        {
-            if (breaks) {
-                if (!yaml_emitter_write_indent(emitter)) return 0;
-                leading_spaces = IS_BLANK(string);
-            }
-            if (!breaks && IS_SPACE(string) && !IS_SPACE_AT(string, 1)
-                    && emitter->column > emitter->best_width) {
-                if (!yaml_emitter_write_indent(emitter)) return 0;
-                MOVE(string);
-            }
-            else {
-                if (!WRITE(emitter, string)) return 0;
-            }
-            emitter->indention = 0;
-            breaks = 0;
-        }
-    }
-
-    return 1;
-}
-

emitter_c.go

@@ -1,2330 +1,1686 @@
 package goyaml
 
-//#include "yaml_private.h"
-//
-///*
-// * Flush the buffer if needed.
-// */
-//
-//#define FLUSH(emitter)                                                          \
-//    ((emitter->buffer.pointer+5 < emitter->buffer.end)                          \
-//     || yaml_emitter_flush(emitter))
-//
-///*
-// * Put a character to the output buffer.
-// */
-//
-//#define PUT(emitter,value)                                                      \
-//    (FLUSH(emitter)                                                             \
-//     && (*(emitter->buffer.pointer++) = (yaml_char_t)(value),                   \
-//         emitter->column ++,                                                    \
-//         1))
-//
-///*
-// * Put a line break to the output buffer.
-// */
-//
-//#define PUT_BREAK(emitter)                                                      \
-//    (FLUSH(emitter)                                                             \
-//     && ((emitter->line_break == YAML_CR_BREAK ?                                \
-//             (*(emitter->buffer.pointer++) = (yaml_char_t) '\r') :              \
-//          emitter->line_break == YAML_LN_BREAK ?                                \
-//             (*(emitter->buffer.pointer++) = (yaml_char_t) '\n') :              \
-//          emitter->line_break == YAML_CRLN_BREAK ?                              \
-//             (*(emitter->buffer.pointer++) = (yaml_char_t) '\r',                \
-//              *(emitter->buffer.pointer++) = (yaml_char_t) '\n') : 0),          \
-//         emitter->column = 0,                                                   \
-//         emitter->line ++,                                                      \
-//         1))
-//
-///*
-// * Copy a character from a string into buffer.
-// */
-//
-//#define WRITE(emitter,string)                                                   \
-//    (FLUSH(emitter)                                                             \
-//     && (COPY(emitter->buffer,string),                                          \
-//         emitter->column ++,                                                    \
-//         1))
-//
-///*
-// * Copy a line break character from a string into buffer.
-// */
-//
-//#define WRITE_BREAK(emitter,string)                                             \
-//    (FLUSH(emitter)                                                             \
-//     && (CHECK(string,'\n') ?                                                   \
-//         (PUT_BREAK(emitter),                                                   \
-//          string.pointer ++,                                                    \
-//          1) :                                                                  \
-//         (COPY(emitter->buffer,string),                                         \
-//          emitter->column = 0,                                                  \
-//          emitter->line ++,                                                     \
-//          1)))
-//
-///*
-// * API functions.
-// */
-//
-//YAML_DECLARE(int)
-//yaml_emitter_emit(yaml_emitter_t *emitter, yaml_event_t *event);
-//
-///*
-// * Utility functions.
-// */
-//
-//static int
-//yaml_emitter_set_emitter_error(yaml_emitter_t *emitter, const char *problem);
-//
-//static int
-//yaml_emitter_need_more_events(yaml_emitter_t *emitter);
-//
-//static int
-//yaml_emitter_append_tag_directive(yaml_emitter_t *emitter,
-//        yaml_tag_directive_t value, int allow_duplicates);
-//
-//static int
-//yaml_emitter_increase_indent(yaml_emitter_t *emitter,
-//        int flow, int indentless);
-//
-///*
-// * State functions.
-// */
-//
-//static int
-//yaml_emitter_state_machine(yaml_emitter_t *emitter, yaml_event_t *event);
-//
-//static int
-//yaml_emitter_emit_stream_start(yaml_emitter_t *emitter,
-//        yaml_event_t *event);
-//
-//static int
-//yaml_emitter_emit_document_start(yaml_emitter_t *emitter,
-//        yaml_event_t *event, int first);
-//
-//static int
-//yaml_emitter_emit_document_content(yaml_emitter_t *emitter,
-//        yaml_event_t *event);
-//
-//static int
-//yaml_emitter_emit_document_end(yaml_emitter_t *emitter,
-//        yaml_event_t *event);
-//
-//static int
-//yaml_emitter_emit_flow_sequence_item(yaml_emitter_t *emitter,
-//        yaml_event_t *event, int first);
-//
-//static int
-//yaml_emitter_emit_flow_mapping_key(yaml_emitter_t *emitter,
-//        yaml_event_t *event, int first);
-//
-//static int
-//yaml_emitter_emit_flow_mapping_value(yaml_emitter_t *emitter,
-//        yaml_event_t *event, int simple);
-//
-//static int
-//yaml_emitter_emit_block_sequence_item(yaml_emitter_t *emitter,
-//        yaml_event_t *event, int first);
-//
-//static int
-//yaml_emitter_emit_block_mapping_key(yaml_emitter_t *emitter,
-//        yaml_event_t *event, int first);
-//
-//static int
-//yaml_emitter_emit_block_mapping_value(yaml_emitter_t *emitter,
-//        yaml_event_t *event, int simple);
-//
-//static int
-//yaml_emitter_emit_node(yaml_emitter_t *emitter, yaml_event_t *event,
-//        int root, int sequence, int mapping, int simple_key);
-//
-//static int
-//yaml_emitter_emit_alias(yaml_emitter_t *emitter, yaml_event_t *event);
-//
-//static int
-//yaml_emitter_emit_scalar(yaml_emitter_t *emitter, yaml_event_t *event);
-//
-//static int
-//yaml_emitter_emit_sequence_start(yaml_emitter_t *emitter, yaml_event_t *event);
-//
-//static int
-//yaml_emitter_emit_mapping_start(yaml_emitter_t *emitter, yaml_event_t *event);
-//
-///*
-// * Checkers.
-// */
-//
-//static int
-//yaml_emitter_check_empty_document(yaml_emitter_t *emitter);
-//
-//static int
-//yaml_emitter_check_empty_sequence(yaml_emitter_t *emitter);
-//
-//static int
-//yaml_emitter_check_empty_mapping(yaml_emitter_t *emitter);
-//
-//static int
-//yaml_emitter_check_simple_key(yaml_emitter_t *emitter);
-//
-//static int
-//yaml_emitter_select_scalar_style(yaml_emitter_t *emitter, yaml_event_t *event);
-//
-///*
-// * Processors.
-// */
-//
-//static int
-//yaml_emitter_process_anchor(yaml_emitter_t *emitter);
-//
-//static int
-//yaml_emitter_process_tag(yaml_emitter_t *emitter);
-//
-//static int
-//yaml_emitter_process_scalar(yaml_emitter_t *emitter);
-//
-///*
-// * Analyzers.
-// */
-//
-//static int
-//yaml_emitter_analyze_version_directive(yaml_emitter_t *emitter,
-//        yaml_version_directive_t version_directive);
-//
-//static int
-//yaml_emitter_analyze_tag_directive(yaml_emitter_t *emitter,
-//        yaml_tag_directive_t tag_directive);
-//
-//static int
-//yaml_emitter_analyze_anchor(yaml_emitter_t *emitter,
-//        yaml_char_t *anchor, int alias);
-//
-//static int
-//yaml_emitter_analyze_tag(yaml_emitter_t *emitter,
-//        yaml_char_t *tag);
-//
-//static int
-//yaml_emitter_analyze_scalar(yaml_emitter_t *emitter,
-//        yaml_char_t *value, size_t length);
-//
-//static int
-//yaml_emitter_analyze_event(yaml_emitter_t *emitter,
-//        yaml_event_t *event);
-//
-///*
-// * Writers.
-// */
-//
-//static int
-//yaml_emitter_write_bom(yaml_emitter_t *emitter);
-//
-//static int
-//yaml_emitter_write_indent(yaml_emitter_t *emitter);
-//
-//static int
-//yaml_emitter_write_indicator(yaml_emitter_t *emitter,
-//        char *indicator, int need_whitespace,
-//        int is_whitespace, int is_indention);
-//
-//static int
-//yaml_emitter_write_anchor(yaml_emitter_t *emitter,
-//        yaml_char_t *value, size_t length);
-//
-//static int
-//yaml_emitter_write_tag_handle(yaml_emitter_t *emitter,
-//        yaml_char_t *value, size_t length);
-//
-//static int
-//yaml_emitter_write_tag_content(yaml_emitter_t *emitter,
-//        yaml_char_t *value, size_t length, int need_whitespace);
-//
-//static int
-//yaml_emitter_write_plain_scalar(yaml_emitter_t *emitter,
-//        yaml_char_t *value, size_t length, int allow_breaks);
-//
-//static int
-//yaml_emitter_write_single_quoted_scalar(yaml_emitter_t *emitter,
-//        yaml_char_t *value, size_t length, int allow_breaks);
-//
-//static int
-//yaml_emitter_write_double_quoted_scalar(yaml_emitter_t *emitter,
-//        yaml_char_t *value, size_t length, int allow_breaks);
-//
-//static int
-//yaml_emitter_write_block_scalar_hints(yaml_emitter_t *emitter,
-//        yaml_string_t string);
-//
-//static int
-//yaml_emitter_write_literal_scalar(yaml_emitter_t *emitter,
-//        yaml_char_t *value, size_t length);
-//
-//static int
-//yaml_emitter_write_folded_scalar(yaml_emitter_t *emitter,
-//        yaml_char_t *value, size_t length);
-//
-///*
-// * Set an emitter error and return 0.
-// */
-//
-//static int
-//yaml_emitter_set_emitter_error(yaml_emitter_t *emitter, const char *problem)
-//{
-//    emitter->error = YAML_EMITTER_ERROR;
-//    emitter->problem = problem;
-//
-//    return 0;
-//}
-//
-///*
-// * Emit an event.
-// */
-//
-//YAML_DECLARE(int)
-//yaml_emitter_emit(yaml_emitter_t *emitter, yaml_event_t *event)
-//{
-//    if (!ENQUEUE(emitter, emitter->events, *event)) {
-//        yaml_event_delete(event);
-//        return 0;
-//    }
-//
-//    while (!yaml_emitter_need_more_events(emitter)) {
-//        if (!yaml_emitter_analyze_event(emitter, emitter->events.head))
-//            return 0;
-//        if (!yaml_emitter_state_machine(emitter, emitter->events.head))
-//            return 0;
-//        yaml_event_delete(&DEQUEUE(emitter, emitter->events));
-//    }
-//
-//    return 1;
-//}
-//
-///*
-// * Check if we need to accumulate more events before emitting.
-// *
-// * We accumulate extra
-// *  - 1 event for DOCUMENT-START
-// *  - 2 events for SEQUENCE-START
-// *  - 3 events for MAPPING-START
-// */
-//
-//static int
-//yaml_emitter_need_more_events(yaml_emitter_t *emitter)
-//{
-//    int level = 0;
-//    int accumulate = 0;
-//    yaml_event_t *event;
-//
-//    if (QUEUE_EMPTY(emitter, emitter->events))
-//        return 1;
-//
-//    switch (emitter->events.head->type) {
-//        case YAML_DOCUMENT_START_EVENT:
-//            accumulate = 1;
-//            break;
-//        case YAML_SEQUENCE_START_EVENT:
-//            accumulate = 2;
-//            break;
-//        case YAML_MAPPING_START_EVENT:
-//            accumulate = 3;
-//            break;
-//        default:
-//            return 0;
-//    }
-//
-//    if (emitter->events.tail - emitter->events.head > accumulate)
-//        return 0;
-//
-//    for (event = emitter->events.head; event != emitter->events.tail; event ++) {
-//        switch (event->type) {
-//            case YAML_STREAM_START_EVENT:
-//            case YAML_DOCUMENT_START_EVENT:
-//            case YAML_SEQUENCE_START_EVENT:
-//            case YAML_MAPPING_START_EVENT:
-//                level += 1;
-//                break;
-//            case YAML_STREAM_END_EVENT:
-//            case YAML_DOCUMENT_END_EVENT:
-//            case YAML_SEQUENCE_END_EVENT:
-//            case YAML_MAPPING_END_EVENT:
-//                level -= 1;
-//                break;
-//            default:
-//                break;
-//        }
-//        if (!level)
-//            return 0;
-//    }
-//
-//    return 1;
-//}
-//
-///*
-// * Append a directive to the directives stack.
-// */
-//
-//static int
-//yaml_emitter_append_tag_directive(yaml_emitter_t *emitter,
-//        yaml_tag_directive_t value, int allow_duplicates)
-//{
-//    yaml_tag_directive_t *tag_directive;
-//    yaml_tag_directive_t copy = { NULL, NULL };
-//
-//    for (tag_directive = emitter->tag_directives.start;
-//            tag_directive != emitter->tag_directives.top; tag_directive ++) {
-//        if (strcmp((char *)value.handle, (char *)tag_directive->handle) == 0) {
-//            if (allow_duplicates)
-//                return 1;
-//            return yaml_emitter_set_emitter_error(emitter,
-//                    "duplicate %TAG directive");
-//        }
-//    }
-//
-//    copy.handle = yaml_strdup(value.handle);
-//    copy.prefix = yaml_strdup(value.prefix);
-//    if (!copy.handle || !copy.prefix) {
-//        emitter->error = YAML_MEMORY_ERROR;
-//        goto error;
-//    }
-//
-//    if (!PUSH(emitter, emitter->tag_directives, copy))
-//        goto error;
-//
-//    return 1;
-//
-//error:
-//    yaml_free(copy.handle);
-//    yaml_free(copy.prefix);
-//    return 0;
-//}
-//
-///*
-// * Increase the indentation level.
-// */
-//
-//static int
-//yaml_emitter_increase_indent(yaml_emitter_t *emitter,
-//        int flow, int indentless)
-//{
-//    if (!PUSH(emitter, emitter->indents, emitter->indent))
-//        return 0;
-//
-//    if (emitter->indent < 0) {
-//        emitter->indent = flow ? emitter->best_indent : 0;
-//    }
-//    else if (!indentless) {
-//        emitter->indent += emitter->best_indent;
-//    }
-//
-//    return 1;
-//}
-//
-///*
-// * State dispatcher.
-// */
-//
-//static int
-//yaml_emitter_state_machine(yaml_emitter_t *emitter, yaml_event_t *event)
-//{
-//    switch (emitter->state)
-//    {
-//        case YAML_EMIT_STREAM_START_STATE:
-//            return yaml_emitter_emit_stream_start(emitter, event);
-//
-//        case YAML_EMIT_FIRST_DOCUMENT_START_STATE:
-//            return yaml_emitter_emit_document_start(emitter, event, 1);
-//
-//        case YAML_EMIT_DOCUMENT_START_STATE:
-//            return yaml_emitter_emit_document_start(emitter, event, 0);
-//
-//        case YAML_EMIT_DOCUMENT_CONTENT_STATE:
-//            return yaml_emitter_emit_document_content(emitter, event);
-//
-//        case YAML_EMIT_DOCUMENT_END_STATE:
-//            return yaml_emitter_emit_document_end(emitter, event);
-//
-//        case YAML_EMIT_FLOW_SEQUENCE_FIRST_ITEM_STATE:
-//            return yaml_emitter_emit_flow_sequence_item(emitter, event, 1);
-//
-//        case YAML_EMIT_FLOW_SEQUENCE_ITEM_STATE:
-//            return yaml_emitter_emit_flow_sequence_item(emitter, event, 0);
-//
-//        case YAML_EMIT_FLOW_MAPPING_FIRST_KEY_STATE:
-//            return yaml_emitter_emit_flow_mapping_key(emitter, event, 1);
-//
-//        case YAML_EMIT_FLOW_MAPPING_KEY_STATE:
-//            return yaml_emitter_emit_flow_mapping_key(emitter, event, 0);
-//
-//        case YAML_EMIT_FLOW_MAPPING_SIMPLE_VALUE_STATE:
-//            return yaml_emitter_emit_flow_mapping_value(emitter, event, 1);
-//
-//        case YAML_EMIT_FLOW_MAPPING_VALUE_STATE:
-//            return yaml_emitter_emit_flow_mapping_value(emitter, event, 0);
-//
-//        case YAML_EMIT_BLOCK_SEQUENCE_FIRST_ITEM_STATE:
-//            return yaml_emitter_emit_block_sequence_item(emitter, event, 1);
-//
-//        case YAML_EMIT_BLOCK_SEQUENCE_ITEM_STATE:
-//            return yaml_emitter_emit_block_sequence_item(emitter, event, 0);
-//
-//        case YAML_EMIT_BLOCK_MAPPING_FIRST_KEY_STATE:
-//            return yaml_emitter_emit_block_mapping_key(emitter, event, 1);
-//
-//        case YAML_EMIT_BLOCK_MAPPING_KEY_STATE:
-//            return yaml_emitter_emit_block_mapping_key(emitter, event, 0);
-//
-//        case YAML_EMIT_BLOCK_MAPPING_SIMPLE_VALUE_STATE:
-//            return yaml_emitter_emit_block_mapping_value(emitter, event, 1);
-//
-//        case YAML_EMIT_BLOCK_MAPPING_VALUE_STATE:
-//            return yaml_emitter_emit_block_mapping_value(emitter, event, 0);
-//
-//        case YAML_EMIT_END_STATE:
-//            return yaml_emitter_set_emitter_error(emitter,
-//                    "expected nothing after STREAM-END");
-//
-//        default:
-//            assert(1);      /* Invalid state. */
-//    }
-//
-//    return 0;
-//}
-//
-///*
-// * Expect STREAM-START.
-// */
-//
-//static int
-//yaml_emitter_emit_stream_start(yaml_emitter_t *emitter,
-//        yaml_event_t *event)
-//{
-//    if (event->type == YAML_STREAM_START_EVENT)
-//    {
-//        if (!emitter->encoding) {
-//            emitter->encoding = event->data.stream_start.encoding;
-//        }
-//
-//        if (!emitter->encoding) {
-//            emitter->encoding = YAML_UTF8_ENCODING;
-//        }
-//
-//        if (emitter->best_indent < 2 || emitter->best_indent > 9) {
-//            emitter->best_indent  = 2;
-//        }
-//
-//        if (emitter->best_width >= 0
-//                && emitter->best_width <= emitter->best_indent*2) {
-//            emitter->best_width = 80;
-//        }
-//
-//        if (emitter->best_width < 0) {
-//            emitter->best_width = INT_MAX;
-//        }
-//        
-//        if (!emitter->line_break) {
-//            emitter->line_break = YAML_LN_BREAK;
-//        }
-//
-//        emitter->indent = -1;
-//
-//        emitter->line = 0;
-//        emitter->column = 0;
-//        emitter->whitespace = 1;
-//        emitter->indention = 1;
-//
-//        if (emitter->encoding != YAML_UTF8_ENCODING) {
-//            if (!yaml_emitter_write_bom(emitter))
-//                return 0;
-//        }
-//
-//        emitter->state = YAML_EMIT_FIRST_DOCUMENT_START_STATE;
-//
-//        return 1;
-//    }
-//
-//    return yaml_emitter_set_emitter_error(emitter,
-//            "expected STREAM-START");
-//}
-//
-///*
-// * Expect DOCUMENT-START or STREAM-END.
-// */
-//
-//static int
-//yaml_emitter_emit_document_start(yaml_emitter_t *emitter,
-//        yaml_event_t *event, int first)
-//{
-//    if (event->type == YAML_DOCUMENT_START_EVENT)
-//    {
-//        yaml_tag_directive_t default_tag_directives[] = {
-//            {(yaml_char_t *)"!", (yaml_char_t *)"!"},
-//            {(yaml_char_t *)"!!", (yaml_char_t *)"tag:yaml.org,2002:"},
-//            {NULL, NULL}
-//        };
-//        yaml_tag_directive_t *tag_directive;
-//        int implicit;
-//
-//        if (event->data.document_start.version_directive) {
-//            if (!yaml_emitter_analyze_version_directive(emitter,
-//                        *event->data.document_start.version_directive))
-//                return 0;
-//        }
-//
-//        for (tag_directive = event->data.document_start.tag_directives.start;
-//                tag_directive != event->data.document_start.tag_directives.end;
-//                tag_directive ++) {
-//            if (!yaml_emitter_analyze_tag_directive(emitter, *tag_directive))
-//                return 0;
-//            if (!yaml_emitter_append_tag_directive(emitter, *tag_directive, 0))
-//                return 0;
-//        }
-//
-//        for (tag_directive = default_tag_directives;
-//                tag_directive->handle; tag_directive ++) {
-//            if (!yaml_emitter_append_tag_directive(emitter, *tag_directive, 1))
-//                return 0;
-//        }
-//
-//        implicit = event->data.document_start.implicit;
-//        if (!first || emitter->canonical) {
-//            implicit = 0;
-//        }
-//
-//        if ((event->data.document_start.version_directive ||
-//                    (event->data.document_start.tag_directives.start
-//                     != event->data.document_start.tag_directives.end)) &&
-//                emitter->open_ended)
-//        {
-//            if (!yaml_emitter_write_indicator(emitter, "...", 1, 0, 0))
-//                return 0;
-//            if (!yaml_emitter_write_indent(emitter))
-//                return 0;
-//        }
-//
-//        if (event->data.document_start.version_directive) {
-//            implicit = 0;
-//            if (!yaml_emitter_write_indicator(emitter, "%YAML", 1, 0, 0))
-//                return 0;
-//            if (!yaml_emitter_write_indicator(emitter, "1.1", 1, 0, 0))
-//                return 0;
-//            if (!yaml_emitter_write_indent(emitter))
-//                return 0;
-//        }
-//        
-//        if (event->data.document_start.tag_directives.start
-//                != event->data.document_start.tag_directives.end) {
-//            implicit = 0;
-//            for (tag_directive = event->data.document_start.tag_directives.start;
-//                    tag_directive != event->data.document_start.tag_directives.end;
-//                    tag_directive ++) {
-//                if (!yaml_emitter_write_indicator(emitter, "%TAG", 1, 0, 0))
-//                    return 0;
-//                if (!yaml_emitter_write_tag_handle(emitter, tag_directive->handle,
-//                            strlen((char *)tag_directive->handle)))
-//                    return 0;
-//                if (!yaml_emitter_write_tag_content(emitter, tag_directive->prefix,
-//                            strlen((char *)tag_directive->prefix), 1))
-//                    return 0;
-//                if (!yaml_emitter_write_indent(emitter))
-//                    return 0;
-//            }
-//        }
-//
-//        if (yaml_emitter_check_empty_document(emitter)) {
-//            implicit = 0;
-//        }
-//
-//        if (!implicit) {
-//            if (!yaml_emitter_write_indent(emitter))
-//                return 0;
-//            if (!yaml_emitter_write_indicator(emitter, "---", 1, 0, 0))
-//                return 0;
-//            if (emitter->canonical) {
-//                if (!yaml_emitter_write_indent(emitter))
-//                    return 0;
-//            }
-//        }
-//
-//        emitter->state = YAML_EMIT_DOCUMENT_CONTENT_STATE;
-//
-//        return 1;
-//    }
-//
-//    else if (event->type == YAML_STREAM_END_EVENT)
-//    {
-//        if (emitter->open_ended)
-//        {
-//            if (!yaml_emitter_write_indicator(emitter, "...", 1, 0, 0))
-//                return 0;
-//            if (!yaml_emitter_write_indent(emitter))
-//                return 0;
-//        }
-//
-//        if (!yaml_emitter_flush(emitter))
-//            return 0;
-//
-//        emitter->state = YAML_EMIT_END_STATE;
-//
-//        return 1;
-//    }
-//
-//    return yaml_emitter_set_emitter_error(emitter,
-//            "expected DOCUMENT-START or STREAM-END");
-//}
-//
-///*
-// * Expect the root node.
-// */
-//
-//static int
-//yaml_emitter_emit_document_content(yaml_emitter_t *emitter,
-//        yaml_event_t *event)
-//{
-//    if (!PUSH(emitter, emitter->states, YAML_EMIT_DOCUMENT_END_STATE))
-//        return 0;
-//
-//    return yaml_emitter_emit_node(emitter, event, 1, 0, 0, 0);
-//}
-//
-///*
-// * Expect DOCUMENT-END.
-// */
-//
-//static int
-//yaml_emitter_emit_document_end(yaml_emitter_t *emitter,
-//        yaml_event_t *event)
-//{
-//    if (event->type == YAML_DOCUMENT_END_EVENT)
-//    {
-//        if (!yaml_emitter_write_indent(emitter))
-//            return 0;
-//        if (!event->data.document_end.implicit) {
-//            if (!yaml_emitter_write_indicator(emitter, "...", 1, 0, 0))
-//                return 0;
-//            if (!yaml_emitter_write_indent(emitter))
-//                return 0;
-//        }
-//        if (!yaml_emitter_flush(emitter))
-//            return 0;
-//
-//        emitter->state = YAML_EMIT_DOCUMENT_START_STATE;
-//
-//        while (!STACK_EMPTY(emitter, emitter->tag_directives)) {
-//            yaml_tag_directive_t tag_directive = POP(emitter,
-//                    emitter->tag_directives);
-//            yaml_free(tag_directive.handle);
-//            yaml_free(tag_directive.prefix);
-//        }
-//
-//        return 1;
-//    }
-//
-//    return yaml_emitter_set_emitter_error(emitter,
-//            "expected DOCUMENT-END");
-//}
-//
-///*
-// * 
-// * Expect a flow item node.
-// */
-//
-//static int
-//yaml_emitter_emit_flow_sequence_item(yaml_emitter_t *emitter,
-//        yaml_event_t *event, int first)
-//{
-//    if (first)
-//    {
-//        if (!yaml_emitter_write_indicator(emitter, "[", 1, 1, 0))
-//            return 0;
-//        if (!yaml_emitter_increase_indent(emitter, 1, 0))
-//            return 0;
-//        emitter->flow_level ++;
-//    }
-//
-//    if (event->type == YAML_SEQUENCE_END_EVENT)
-//    {
-//        emitter->flow_level --;
-//        emitter->indent = POP(emitter, emitter->indents);
-//        if (emitter->canonical && !first) {
-//            if (!yaml_emitter_write_indicator(emitter, ",", 0, 0, 0))
-//                return 0;
-//            if (!yaml_emitter_write_indent(emitter))
-//                return 0;
-//        }
-//        if (!yaml_emitter_write_indicator(emitter, "]", 0, 0, 0))
-//            return 0;
-//        emitter->state = POP(emitter, emitter->states);
-//
-//        return 1;
-//    }
-//
-//    if (!first) {
-//        if (!yaml_emitter_write_indicator(emitter, ",", 0, 0, 0))
-//            return 0;
-//    }
-//
-//    if (emitter->canonical || emitter->column > emitter->best_width) {
-//        if (!yaml_emitter_write_indent(emitter))
-//            return 0;
-//    }
-//    if (!PUSH(emitter, emitter->states, YAML_EMIT_FLOW_SEQUENCE_ITEM_STATE))
-//        return 0;
-//
-//    return yaml_emitter_emit_node(emitter, event, 0, 1, 0, 0);
-//}
-//
-///*
-// * Expect a flow key node.
-// */
-//
-//static int
-//yaml_emitter_emit_flow_mapping_key(yaml_emitter_t *emitter,
-//        yaml_event_t *event, int first)
-//{
-//    if (first)
-//    {
-//        if (!yaml_emitter_write_indicator(emitter, "{", 1, 1, 0))
-//            return 0;
-//        if (!yaml_emitter_increase_indent(emitter, 1, 0))
-//            return 0;
-//        emitter->flow_level ++;
-//    }
-//
-//    if (event->type == YAML_MAPPING_END_EVENT)
-//    {
-//        emitter->flow_level --;
-//        emitter->indent = POP(emitter, emitter->indents);
-//        if (emitter->canonical && !first) {
-//            if (!yaml_emitter_write_indicator(emitter, ",", 0, 0, 0))
-//                return 0;
-//            if (!yaml_emitter_write_indent(emitter))
-//                return 0;
-//        }
-//        if (!yaml_emitter_write_indicator(emitter, "}", 0, 0, 0))
-//            return 0;
-//        emitter->state = POP(emitter, emitter->states);
-//
-//        return 1;
-//    }
-//
-//    if (!first) {
-//        if (!yaml_emitter_write_indicator(emitter, ",", 0, 0, 0))
-//            return 0;
-//    }
-//    if (emitter->canonical || emitter->column > emitter->best_width) {
-//        if (!yaml_emitter_write_indent(emitter))
-//            return 0;
-//    }
-//
-//    if (!emitter->canonical && yaml_emitter_check_simple_key(emitter))
-//    {
-//        if (!PUSH(emitter, emitter->states,
-//                    YAML_EMIT_FLOW_MAPPING_SIMPLE_VALUE_STATE))
-//            return 0;
-//
-//        return yaml_emitter_emit_node(emitter, event, 0, 0, 1, 1);
-//    }
-//    else
-//    {
-//        if (!yaml_emitter_write_indicator(emitter, "?", 1, 0, 0))
-//            return 0;
-//        if (!PUSH(emitter, emitter->states,
-//                    YAML_EMIT_FLOW_MAPPING_VALUE_STATE))
-//            return 0;
-//
-//        return yaml_emitter_emit_node(emitter, event, 0, 0, 1, 0);
-//    }
-//}
-//
-///*
-// * Expect a flow value node.
-// */
-//
-//static int
-//yaml_emitter_emit_flow_mapping_value(yaml_emitter_t *emitter,
-//        yaml_event_t *event, int simple)
-//{
-//    if (simple) {
-//        if (!yaml_emitter_write_indicator(emitter, ":", 0, 0, 0))
-//            return 0;
-//    }
-//    else {
-//        if (emitter->canonical || emitter->column > emitter->best_width) {
-//            if (!yaml_emitter_write_indent(emitter))
-//                return 0;
-//        }
-//        if (!yaml_emitter_write_indicator(emitter, ":", 1, 0, 0))
-//            return 0;
-//    }
-//    if (!PUSH(emitter, emitter->states, YAML_EMIT_FLOW_MAPPING_KEY_STATE))
-//        return 0;
-//    return yaml_emitter_emit_node(emitter, event, 0, 0, 1, 0);
-//}
-//
-///*
-// * Expect a block item node.
-// */
-//
-//static int
-//yaml_emitter_emit_block_sequence_item(yaml_emitter_t *emitter,
-//        yaml_event_t *event, int first)
-//{
-//    if (first)
-//    {
-//        if (!yaml_emitter_increase_indent(emitter, 0,
-//                    (emitter->mapping_context && !emitter->indention)))
-//            return 0;
-//    }
-//
-//    if (event->type == YAML_SEQUENCE_END_EVENT)
-//    {
-//        emitter->indent = POP(emitter, emitter->indents);
-//        emitter->state = POP(emitter, emitter->states);
-//
-//        return 1;
-//    }
-//
-//    if (!yaml_emitter_write_indent(emitter))
-//        return 0;
-//    if (!yaml_emitter_write_indicator(emitter, "-", 1, 0, 1))
-//        return 0;
-//    if (!PUSH(emitter, emitter->states,
-//                YAML_EMIT_BLOCK_SEQUENCE_ITEM_STATE))
-//        return 0;
-//
-//    return yaml_emitter_emit_node(emitter, event, 0, 1, 0, 0);
-//}
-//
-///*
-// * Expect a block key node.
-// */
-//
-//static int
-//yaml_emitter_emit_block_mapping_key(yaml_emitter_t *emitter,
-//        yaml_event_t *event, int first)
-//{
-//    if (first)
-//    {
-//        if (!yaml_emitter_increase_indent(emitter, 0, 0))
-//            return 0;
-//    }
-//
-//    if (event->type == YAML_MAPPING_END_EVENT)
-//    {
-//        emitter->indent = POP(emitter, emitter->indents);
-//        emitter->state = POP(emitter, emitter->states);
-//
-//        return 1;
-//    }
-//
-//    if (!yaml_emitter_write_indent(emitter))
-//        return 0;
-//
-//    if (yaml_emitter_check_simple_key(emitter))
-//    {
-//        if (!PUSH(emitter, emitter->states,
-//                    YAML_EMIT_BLOCK_MAPPING_SIMPLE_VALUE_STATE))
-//            return 0;
-//
-//        return yaml_emitter_emit_node(emitter, event, 0, 0, 1, 1);
-//    }
-//    else
-//    {
-//        if (!yaml_emitter_write_indicator(emitter, "?", 1, 0, 1))
-//            return 0;
-//        if (!PUSH(emitter, emitter->states,
-//                    YAML_EMIT_BLOCK_MAPPING_VALUE_STATE))
-//            return 0;
-//
-//        return yaml_emitter_emit_node(emitter, event, 0, 0, 1, 0);
-//    }
-//}
-//
-///*
-// * Expect a block value node.
-// */
-//
-//static int
-//yaml_emitter_emit_block_mapping_value(yaml_emitter_t *emitter,
-//        yaml_event_t *event, int simple)
-//{
-//    if (simple) {
-//        if (!yaml_emitter_write_indicator(emitter, ":", 0, 0, 0))
-//            return 0;
-//    }
-//    else {
-//        if (!yaml_emitter_write_indent(emitter))
-//            return 0;
-//        if (!yaml_emitter_write_indicator(emitter, ":", 1, 0, 1))
-//            return 0;
-//    }
-//    if (!PUSH(emitter, emitter->states,
-//                YAML_EMIT_BLOCK_MAPPING_KEY_STATE))
-//        return 0;
-//
-//    return yaml_emitter_emit_node(emitter, event, 0, 0, 1, 0);
-//}
-//
-///*
-// * Expect a node.
-// */
-//
-//static int
-//yaml_emitter_emit_node(yaml_emitter_t *emitter, yaml_event_t *event,
-//        int root, int sequence, int mapping, int simple_key)
-//{
-//    emitter->root_context = root;
-//    emitter->sequence_context = sequence;
-//    emitter->mapping_context = mapping;
-//    emitter->simple_key_context = simple_key;
-//
-//    switch (event->type)
-//    {
-//        case YAML_ALIAS_EVENT:
-//            return yaml_emitter_emit_alias(emitter, event);
-//
-//        case YAML_SCALAR_EVENT:
-//            return yaml_emitter_emit_scalar(emitter, event);
-//
-//        case YAML_SEQUENCE_START_EVENT:
-//            return yaml_emitter_emit_sequence_start(emitter, event);
-//
-//        case YAML_MAPPING_START_EVENT:
-//            return yaml_emitter_emit_mapping_start(emitter, event);
-//
-//        default:
-//            return yaml_emitter_set_emitter_error(emitter,
-//                    "expected SCALAR, SEQUENCE-START, MAPPING-START, or ALIAS");
-//    }
-//
-//    return 0;
-//}
-//
-///*
-// * Expect ALIAS.
-// */
-//
-//static int
-//yaml_emitter_emit_alias(yaml_emitter_t *emitter, yaml_event_t *event)
-//{
-//    if (!yaml_emitter_process_anchor(emitter))
-//        return 0;
-//    emitter->state = POP(emitter, emitter->states);
-//
-//    return 1;
-//}
-//
-///*
-// * Expect SCALAR.
-// */
-//
-//static int
-//yaml_emitter_emit_scalar(yaml_emitter_t *emitter, yaml_event_t *event)
-//{
-//    if (!yaml_emitter_select_scalar_style(emitter, event))
-//        return 0;
-//    if (!yaml_emitter_process_anchor(emitter))
-//        return 0;
-//    if (!yaml_emitter_process_tag(emitter))
-//        return 0;
-//    if (!yaml_emitter_increase_indent(emitter, 1, 0))
-//        return 0;
-//    if (!yaml_emitter_process_scalar(emitter))
-//        return 0;
-//    emitter->indent = POP(emitter, emitter->indents);
-//    emitter->state = POP(emitter, emitter->states);
-//
-//    return 1;
-//}
-//
-///*
-// * Expect SEQUENCE-START.
-// */
-//
-//static int
-//yaml_emitter_emit_sequence_start(yaml_emitter_t *emitter, yaml_event_t *event)
-//{
-//    if (!yaml_emitter_process_anchor(emitter))
-//        return 0;
-//    if (!yaml_emitter_process_tag(emitter))
-//        return 0;
-//
-//    if (emitter->flow_level || emitter->canonical
-//            || event->data.sequence_start.style == YAML_FLOW_SEQUENCE_STYLE
-//            || yaml_emitter_check_empty_sequence(emitter)) {
-//        emitter->state = YAML_EMIT_FLOW_SEQUENCE_FIRST_ITEM_STATE;
-//    }
-//    else {
-//        emitter->state = YAML_EMIT_BLOCK_SEQUENCE_FIRST_ITEM_STATE;
-//    }
-//
-//    return 1;
-//}
-//
-///*
-// * Expect MAPPING-START.
-// */
-//
-//static int
-//yaml_emitter_emit_mapping_start(yaml_emitter_t *emitter, yaml_event_t *event)
-//{
-//    if (!yaml_emitter_process_anchor(emitter))
-//        return 0;
-//    if (!yaml_emitter_process_tag(emitter))
-//        return 0;
-//
-//    if (emitter->flow_level || emitter->canonical
-//            || event->data.mapping_start.style == YAML_FLOW_MAPPING_STYLE
-//            || yaml_emitter_check_empty_mapping(emitter)) {
-//        emitter->state = YAML_EMIT_FLOW_MAPPING_FIRST_KEY_STATE;
-//    }
-//    else {
-//        emitter->state = YAML_EMIT_BLOCK_MAPPING_FIRST_KEY_STATE;
-//    }
-//
-//    return 1;
-//}
-//
-///*
-// * Check if the document content is an empty scalar.
-// */
-//
-//static int
-//yaml_emitter_check_empty_document(yaml_emitter_t *emitter)
-//{
-//    return 0;
-//}
-//
-///*
-// * Check if the next events represent an empty sequence.
-// */
-//
-//static int
-//yaml_emitter_check_empty_sequence(yaml_emitter_t *emitter)
-//{
-//    if (emitter->events.tail - emitter->events.head < 2)
-//        return 0;
-//
-//    return (emitter->events.head[0].type == YAML_SEQUENCE_START_EVENT
-//            && emitter->events.head[1].type == YAML_SEQUENCE_END_EVENT);
-//}
-//
-///*
-// * Check if the next events represent an empty mapping.
-// */
-//
-//static int
-//yaml_emitter_check_empty_mapping(yaml_emitter_t *emitter)
-//{
-//    if (emitter->events.tail - emitter->events.head < 2)
-//        return 0;
-//
-//    return (emitter->events.head[0].type == YAML_MAPPING_START_EVENT
-//            && emitter->events.head[1].type == YAML_MAPPING_END_EVENT);
-//}
-//
-///*
-// * Check if the next node can be expressed as a simple key.
-// */
-//
-//static int
-//yaml_emitter_check_simple_key(yaml_emitter_t *emitter)
-//{
-//    yaml_event_t *event = emitter->events.head;
-//    size_t length = 0;
-//
-//    switch (event->type)
-//    {
-//        case YAML_ALIAS_EVENT:
-//            length += emitter->anchor_data.anchor_length;
-//            break;
-//
-//        case YAML_SCALAR_EVENT:
-//            if (emitter->scalar_data.multiline)
-//                return 0;
-//            length += emitter->anchor_data.anchor_length
-//                + emitter->tag_data.handle_length
-//                + emitter->tag_data.suffix_length
-//                + emitter->scalar_data.length;
-//            break;
-//
-//        case YAML_SEQUENCE_START_EVENT:
-//            if (!yaml_emitter_check_empty_sequence(emitter))
-//                return 0;
-//            length += emitter->anchor_data.anchor_length
-//                + emitter->tag_data.handle_length
-//                + emitter->tag_data.suffix_length;
-//            break;
-//
-//        case YAML_MAPPING_START_EVENT:
-//            if (!yaml_emitter_check_empty_mapping(emitter))
-//                return 0;
-//            length += emitter->anchor_data.anchor_length
-//                + emitter->tag_data.handle_length
-//                + emitter->tag_data.suffix_length;
-//            break;
-//
-//        default:
-//            return 0;
-//    }
-//
-//    if (length > 128)
-//        return 0;
-//
-//    return 1;
-//}
-//
-///*
-// * Determine an acceptable scalar style.
-// */
-//
-//static int
-//yaml_emitter_select_scalar_style(yaml_emitter_t *emitter, yaml_event_t *event)
-//{
-//    yaml_scalar_style_t style = event->data.scalar.style;
-//    int no_tag = (!emitter->tag_data.handle && !emitter->tag_data.suffix);
-//
-//    if (no_tag && !event->data.scalar.plain_implicit
-//            && !event->data.scalar.quoted_implicit) {
-//        return yaml_emitter_set_emitter_error(emitter,
-//                "neither tag nor implicit flags are specified");
-//    }
-//
-//    if (style == YAML_ANY_SCALAR_STYLE)
-//        style = YAML_PLAIN_SCALAR_STYLE;
-//
-//    if (emitter->canonical)
-//        style = YAML_DOUBLE_QUOTED_SCALAR_STYLE;
-//
-//    if (emitter->simple_key_context && emitter->scalar_data.multiline)
-//        style = YAML_DOUBLE_QUOTED_SCALAR_STYLE;
-//
-//    if (style == YAML_PLAIN_SCALAR_STYLE)
-//    {
-//        if ((emitter->flow_level && !emitter->scalar_data.flow_plain_allowed)
-//                || (!emitter->flow_level && !emitter->scalar_data.block_plain_allowed))
-//            style = YAML_SINGLE_QUOTED_SCALAR_STYLE;
-//        if (!emitter->scalar_data.length
-//                && (emitter->flow_level || emitter->simple_key_context))
-//            style = YAML_SINGLE_QUOTED_SCALAR_STYLE;
-//        if (no_tag && !event->data.scalar.plain_implicit)
-//            style = YAML_SINGLE_QUOTED_SCALAR_STYLE;
-//    }
-//
-//    if (style == YAML_SINGLE_QUOTED_SCALAR_STYLE)
-//    {
-//        if (!emitter->scalar_data.single_quoted_allowed)
-//            style = YAML_DOUBLE_QUOTED_SCALAR_STYLE;
-//    }
-//
-//    if (style == YAML_LITERAL_SCALAR_STYLE || style == YAML_FOLDED_SCALAR_STYLE)
-//    {
-//        if (!emitter->scalar_data.block_allowed
-//                || emitter->flow_level || emitter->simple_key_context)
-//            style = YAML_DOUBLE_QUOTED_SCALAR_STYLE;
-//    }
-//
-//    if (no_tag && !event->data.scalar.quoted_implicit
-//            && style != YAML_PLAIN_SCALAR_STYLE)
-//    {
-//        emitter->tag_data.handle = (yaml_char_t *)"!";
-//        emitter->tag_data.handle_length = 1;
-//    }
-//
-//    emitter->scalar_data.style = style;
-//
-//    return 1;
-//}
-//
-///*
-// * Write an achor.
-// */
-//
-//static int
-//yaml_emitter_process_anchor(yaml_emitter_t *emitter)
-//{
-//    if (!emitter->anchor_data.anchor)
-//        return 1;
-//
-//    if (!yaml_emitter_write_indicator(emitter,
-//                (emitter->anchor_data.alias ? "*" : "&"), 1, 0, 0))
-//        return 0;
-//
-//    return yaml_emitter_write_anchor(emitter,
-//            emitter->anchor_data.anchor, emitter->anchor_data.anchor_length);
-//}
-//
-///*
-// * Write a tag.
-// */
-//
-//static int
-//yaml_emitter_process_tag(yaml_emitter_t *emitter)
-//{
-//    if (!emitter->tag_data.handle && !emitter->tag_data.suffix)
-//        return 1;
-//
-//    if (emitter->tag_data.handle)
-//    {
-//        if (!yaml_emitter_write_tag_handle(emitter, emitter->tag_data.handle,
-//                    emitter->tag_data.handle_length))
-//            return 0;
-//        if (emitter->tag_data.suffix) {
-//            if (!yaml_emitter_write_tag_content(emitter, emitter->tag_data.suffix,
-//                        emitter->tag_data.suffix_length, 0))
-//                return 0;
-//        }
-//    }
-//    else
-//    {
-//        if (!yaml_emitter_write_indicator(emitter, "!<", 1, 0, 0))
-//            return 0;
-//        if (!yaml_emitter_write_tag_content(emitter, emitter->tag_data.suffix,
-//                    emitter->tag_data.suffix_length, 0))
-//            return 0;
-//        if (!yaml_emitter_write_indicator(emitter, ">", 0, 0, 0))
-//            return 0;
-//    }
-//
-//    return 1;
-//}
-//
-///*
-// * Write a scalar.
-// */
-//
-//static int
-//yaml_emitter_process_scalar(yaml_emitter_t *emitter)
-//{
-//    switch (emitter->scalar_data.style)
-//    {
-//        case YAML_PLAIN_SCALAR_STYLE:
-//            return yaml_emitter_write_plain_scalar(emitter,
-//                    emitter->scalar_data.value, emitter->scalar_data.length,
-//                    !emitter->simple_key_context);
-//
-//        case YAML_SINGLE_QUOTED_SCALAR_STYLE:
-//            return yaml_emitter_write_single_quoted_scalar(emitter,
-//                    emitter->scalar_data.value, emitter->scalar_data.length,
-//                    !emitter->simple_key_context);
-//
-//        case YAML_DOUBLE_QUOTED_SCALAR_STYLE:
-//            return yaml_emitter_write_double_quoted_scalar(emitter,
-//                    emitter->scalar_data.value, emitter->scalar_data.length,
-//                    !emitter->simple_key_context);
-//
-//        case YAML_LITERAL_SCALAR_STYLE:
-//            return yaml_emitter_write_literal_scalar(emitter,
-//                    emitter->scalar_data.value, emitter->scalar_data.length);
-//
-//        case YAML_FOLDED_SCALAR_STYLE:
-//            return yaml_emitter_write_folded_scalar(emitter,
-//                    emitter->scalar_data.value, emitter->scalar_data.length);
-//
-//        default:
-//            assert(1);      /* Impossible. */
-//    }
-//
-//    return 0;
-//}
-//
-///*
-// * Check if a %YAML directive is valid.
-// */
-//
-//static int
-//yaml_emitter_analyze_version_directive(yaml_emitter_t *emitter,
-//        yaml_version_directive_t version_directive)
-//{
-//    if (version_directive.major != 1 || version_directive.minor != 1) {
-//        return yaml_emitter_set_emitter_error(emitter,
-//                "incompatible %YAML directive");
-//    }
-//
-//    return 1;
-//}
-//
-///*
-// * Check if a %TAG directive is valid.
-// */
-//
-//static int
-//yaml_emitter_analyze_tag_directive(yaml_emitter_t *emitter,
-//        yaml_tag_directive_t tag_directive)
-//{
-//    yaml_string_t handle;
-//    yaml_string_t prefix;
-//    size_t handle_length;
-//    size_t prefix_length;
-//
-//    handle_length = strlen((char *)tag_directive.handle);
-//    prefix_length = strlen((char *)tag_directive.prefix);
-//    STRING_ASSIGN(handle, tag_directive.handle, handle_length);
-//    STRING_ASSIGN(prefix, tag_directive.prefix, prefix_length);
-//
-//    if (handle.start == handle.end) {
-//        return yaml_emitter_set_emitter_error(emitter,
-//                "tag handle must not be empty");
-//    }
-//
-//    if (handle.start[0] != '!') {
-//        return yaml_emitter_set_emitter_error(emitter,
-//                "tag handle must start with '!'");
-//    }
-//
-//    if (handle.end[-1] != '!') {
-//        return yaml_emitter_set_emitter_error(emitter,
-//                "tag handle must end with '!'");
-//    }
-//
-//    handle.pointer ++;
-//
-//    while (handle.pointer < handle.end-1) {
-//        if (!IS_ALPHA(handle)) {
-//            return yaml_emitter_set_emitter_error(emitter,
-//                    "tag handle must contain alphanumerical characters only");
-//        }
-//        MOVE(handle);
-//    }
-//
-//    if (prefix.start == prefix.end) {
-//        return yaml_emitter_set_emitter_error(emitter,
-//                "tag prefix must not be empty");
-//    }
-//
-//    return 1;
-//}
-//
-///*
-// * Check if an anchor is valid.
-// */
-//
-//static int
-//yaml_emitter_analyze_anchor(yaml_emitter_t *emitter,
-//        yaml_char_t *anchor, int alias)
-//{
-//    size_t anchor_length;
-//    yaml_string_t string;
-//    
-//    anchor_length = strlen((char *)anchor);
-//    STRING_ASSIGN(string, anchor, anchor_length);
-//
-//    if (string.start == string.end) {
-//        return yaml_emitter_set_emitter_error(emitter, alias ?
-//                "alias value must not be empty" :
-//                "anchor value must not be empty");
-//    }
-//
-//    while (string.pointer != string.end) {
-//        if (!IS_ALPHA(string)) {
-//            return yaml_emitter_set_emitter_error(emitter, alias ?
-//                    "alias value must contain alphanumerical characters only" :
-//                    "anchor value must contain alphanumerical characters only");
-//        }
-//        MOVE(string);
-//    }
-//
-//    emitter->anchor_data.anchor = string.start;
-//    emitter->anchor_data.anchor_length = string.end - string.start;
-//    emitter->anchor_data.alias = alias;
-//
-//    return 1;
-//}
-//
-///*
-// * Check if a tag is valid.
-// */
-//
-//static int
-//yaml_emitter_analyze_tag(yaml_emitter_t *emitter,
-//        yaml_char_t *tag)
-//{
-//    size_t tag_length;
-//    yaml_string_t string;
-//    yaml_tag_directive_t *tag_directive;
-//
-//    tag_length = strlen((char *)tag);
-//    STRING_ASSIGN(string, tag, tag_length);
-//
-//    if (string.start == string.end) {
-//        return yaml_emitter_set_emitter_error(emitter,
-//                "tag value must not be empty");
-//    }
-//
-//    for (tag_directive = emitter->tag_directives.start;
-//            tag_directive != emitter->tag_directives.top; tag_directive ++) {
-//        size_t prefix_length = strlen((char *)tag_directive->prefix);
-//        if (prefix_length < (size_t)(string.end - string.start)
-//                && strncmp((char *)tag_directive->prefix, (char *)string.start,
-//                    prefix_length) == 0)
-//        {
-//            emitter->tag_data.handle = tag_directive->handle;
-//            emitter->tag_data.handle_length =
-//                strlen((char *)tag_directive->handle);
-//            emitter->tag_data.suffix = string.start + prefix_length;
-//            emitter->tag_data.suffix_length =
-//                (string.end - string.start) - prefix_length;
-//            return 1;
-//        }
-//    }
-//
-//    emitter->tag_data.suffix = string.start;
-//    emitter->tag_data.suffix_length = string.end - string.start;
-//
-//    return 1;
-//}
-//
-///*
-// * Check if a scalar is valid.
-// */
-//
-//static int
-//yaml_emitter_analyze_scalar(yaml_emitter_t *emitter,
-//        yaml_char_t *value, size_t length)
-//{
-//    yaml_string_t string;
-//
-//    int block_indicators = 0;
-//    int flow_indicators = 0;
-//    int line_breaks = 0;
-//    int special_characters = 0;
-//
-//    int leading_space = 0;
-//    int leading_break = 0;
-//    int trailing_space = 0;
-//    int trailing_break = 0;
-//    int break_space = 0;
-//    int space_break = 0;
-//
-//    int preceeded_by_whitespace = 0;
-//    int followed_by_whitespace = 0;
-//    int previous_space = 0;
-//    int previous_break = 0;
-//
-//    STRING_ASSIGN(string, value, length);
-//
-//    emitter->scalar_data.value = value;
-//    emitter->scalar_data.length = length;
-//
-//    if (string.start == string.end)
-//    {
-//        emitter->scalar_data.multiline = 0;
-//        emitter->scalar_data.flow_plain_allowed = 0;
-//        emitter->scalar_data.block_plain_allowed = 1;
-//        emitter->scalar_data.single_quoted_allowed = 1;
-//        emitter->scalar_data.block_allowed = 0;
-//
-//        return 1;
-//    }
-//
-//    if ((CHECK_AT(string, '-', 0)
-//                && CHECK_AT(string, '-', 1)
-//                && CHECK_AT(string, '-', 2))
-//            || (CHECK_AT(string, '.', 0)
-//                && CHECK_AT(string, '.', 1)
-//                && CHECK_AT(string, '.', 2))) {
-//        block_indicators = 1;
-//        flow_indicators = 1;
-//    }
-//
-//    preceeded_by_whitespace = 1;
-//    followed_by_whitespace = IS_BLANKZ_AT(string, WIDTH(string));
-//
-//    while (string.pointer != string.end)
-//    {
-//        if (string.start == string.pointer)
-//        {
-//            if (CHECK(string, '#') || CHECK(string, ',')
-//                    || CHECK(string, '[') || CHECK(string, ']')
-//                    || CHECK(string, '{') || CHECK(string, '}')
-//                    || CHECK(string, '&') || CHECK(string, '*')
-//                    || CHECK(string, '!') || CHECK(string, '|')
-//                    || CHECK(string, '>') || CHECK(string, '\'')
-//                    || CHECK(string, '"') || CHECK(string, '%')
-//                    || CHECK(string, '@') || CHECK(string, '`')) {
-//                flow_indicators = 1;
-//                block_indicators = 1;
-//            }
-//
-//            if (CHECK(string, '?') || CHECK(string, ':')) {
-//                flow_indicators = 1;
-//                if (followed_by_whitespace) {
-//                    block_indicators = 1;
-//                }
-//            }
-//
-//            if (CHECK(string, '-') && followed_by_whitespace) {
-//                flow_indicators = 1;
-//                block_indicators = 1;
-//            }
-//        }
-//        else
-//        {
-//            if (CHECK(string, ',') || CHECK(string, '?')
-//                    || CHECK(string, '[') || CHECK(string, ']')
-//                    || CHECK(string, '{') || CHECK(string, '}')) {
-//                flow_indicators = 1;
-//            }
-//
-//            if (CHECK(string, ':')) {
-//                flow_indicators = 1;
-//                if (followed_by_whitespace) {
-//                    block_indicators = 1;
-//                }
-//            }
-//
-//            if (CHECK(string, '#') && preceeded_by_whitespace) {
-//                flow_indicators = 1;
-//                block_indicators = 1;
-//            }
-//        }
-//
-//        if (!IS_PRINTABLE(string)
-//                || (!IS_ASCII(string) && !emitter->unicode)) {
-//            special_characters = 1;
-//        }
-//
-//        if (IS_BREAK(string)) {
-//            line_breaks = 1;
-//        }
-//
-//        if (IS_SPACE(string))
-//        {
-//            if (string.start == string.pointer) {
-//                leading_space = 1;
-//            }
-//            if (string.pointer+WIDTH(string) == string.end) {
-//                trailing_space = 1;
-//            }
-//            if (previous_break) {
-//                break_space = 1;
-//            }
-//            previous_space = 1;
-//            previous_break = 0;
-//        }
-//        else if (IS_BREAK(string))
-//        {
-//            if (string.start == string.pointer) {
-//                leading_break = 1;
-//            }
-//            if (string.pointer+WIDTH(string) == string.end) {
-//                trailing_break = 1;
-//            }
-//            if (previous_space) {
-//                space_break = 1;
-//            }
-//            previous_space = 0;
-//            previous_break = 1;
-//        }
-//        else
-//        {
-//            previous_space = 0;
-//            previous_break = 0;
-//        }
-//
-//        preceeded_by_whitespace = IS_BLANKZ(string);
-//        MOVE(string);
-//        if (string.pointer != string.end) {
-//            followed_by_whitespace = IS_BLANKZ_AT(string, WIDTH(string));
-//        }
-//    }
-//
-//    emitter->scalar_data.multiline = line_breaks;
-//
-//    emitter->scalar_data.flow_plain_allowed = 1;
-//    emitter->scalar_data.block_plain_allowed = 1;
-//    emitter->scalar_data.single_quoted_allowed = 1;
-//    emitter->scalar_data.block_allowed = 1;
-//
-//    if (leading_space || leading_break || trailing_space || trailing_break) {
-//        emitter->scalar_data.flow_plain_allowed = 0;
-//        emitter->scalar_data.block_plain_allowed = 0;
-//    }
-//
-//    if (trailing_space) {
-//        emitter->scalar_data.block_allowed = 0;
-//    }
-//
-//    if (break_space) {
-//        emitter->scalar_data.flow_plain_allowed = 0;
-//        emitter->scalar_data.block_plain_allowed = 0;
-//        emitter->scalar_data.single_quoted_allowed = 0;
-//    }
-//
-//    if (space_break || special_characters) {
-//        emitter->scalar_data.flow_plain_allowed = 0;
-//        emitter->scalar_data.block_plain_allowed = 0;
-//        emitter->scalar_data.single_quoted_allowed = 0;
-//        emitter->scalar_data.block_allowed = 0;
-//    }
-//
-//    if (line_breaks) {
-//        emitter->scalar_data.flow_plain_allowed = 0;
-//        emitter->scalar_data.block_plain_allowed = 0;
-//    }
-//
-//    if (flow_indicators) {
-//        emitter->scalar_data.flow_plain_allowed = 0;
-//    }
-//
-//    if (block_indicators) {
-//        emitter->scalar_data.block_plain_allowed = 0;
-//    }
-//
-//    return 1;
-//}
-//
-///*
-// * Check if the event data is valid.
-// */
-//
-//static int
-//yaml_emitter_analyze_event(yaml_emitter_t *emitter,
-//        yaml_event_t *event)
-//{
-//    emitter->anchor_data.anchor = NULL;
-//    emitter->anchor_data.anchor_length = 0;
-//    emitter->tag_data.handle = NULL;
-//    emitter->tag_data.handle_length = 0;
-//    emitter->tag_data.suffix = NULL;
-//    emitter->tag_data.suffix_length = 0;
-//    emitter->scalar_data.value = NULL;
-//    emitter->scalar_data.length = 0;
-//
-//    switch (event->type)
-//    {
-//        case YAML_ALIAS_EVENT:
-//            if (!yaml_emitter_analyze_anchor(emitter,
-//                        event->data.alias.anchor, 1))
-//                return 0;
-//            return 1;
-//
-//        case YAML_SCALAR_EVENT:
-//            if (event->data.scalar.anchor) {
-//                if (!yaml_emitter_analyze_anchor(emitter,
-//                            event->data.scalar.anchor, 0))
-//                    return 0;
-//            }
-//            if (event->data.scalar.tag && (emitter->canonical ||
-//                        (!event->data.scalar.plain_implicit
-//                         && !event->data.scalar.quoted_implicit))) {
-//                if (!yaml_emitter_analyze_tag(emitter, event->data.scalar.tag))
-//                    return 0;
-//            }
-//            if (!yaml_emitter_analyze_scalar(emitter,
-//                        event->data.scalar.value, event->data.scalar.length))
-//                return 0;
-//            return 1;
-//
-//        case YAML_SEQUENCE_START_EVENT:
-//            if (event->data.sequence_start.anchor) {
-//                if (!yaml_emitter_analyze_anchor(emitter,
-//                            event->data.sequence_start.anchor, 0))
-//                    return 0;
-//            }
-//            if (event->data.sequence_start.tag && (emitter->canonical ||
-//                        !event->data.sequence_start.implicit)) {
-//                if (!yaml_emitter_analyze_tag(emitter,
-//                            event->data.sequence_start.tag))
-//                    return 0;
-//            }
-//            return 1;
-//
-//        case YAML_MAPPING_START_EVENT:
-//            if (event->data.mapping_start.anchor) {
-//                if (!yaml_emitter_analyze_anchor(emitter,
-//                            event->data.mapping_start.anchor, 0))
-//                    return 0;
-//            }
-//            if (event->data.mapping_start.tag && (emitter->canonical ||
-//                        !event->data.mapping_start.implicit)) {
-//                if (!yaml_emitter_analyze_tag(emitter,
-//                            event->data.mapping_start.tag))
-//                    return 0;
-//            }
-//            return 1;
-//
-//        default:
-//            return 1;
-//    }
-//}
-//
-///*
-// * Write the BOM character.
-// */
-//
-//static int
-//yaml_emitter_write_bom(yaml_emitter_t *emitter)
-//{
-//    if (!FLUSH(emitter)) return 0;
-//
-//    *(emitter->buffer.pointer++) = (yaml_char_t) '\xEF';
-//    *(emitter->buffer.pointer++) = (yaml_char_t) '\xBB';
-//    *(emitter->buffer.pointer++) = (yaml_char_t) '\xBF';
-//
-//    return 1;
-//}
-//
-//static int
-//yaml_emitter_write_indent(yaml_emitter_t *emitter)
-//{
-//    int indent = (emitter->indent >= 0) ? emitter->indent : 0;
-//
-//    if (!emitter->indention || emitter->column > indent
-//            || (emitter->column == indent && !emitter->whitespace)) {
-//        if (!PUT_BREAK(emitter)) return 0;
-//    }
-//
-//    while (emitter->column < indent) {
-//        if (!PUT(emitter, ' ')) return 0;
-//    }
-//
-//    emitter->whitespace = 1;
-//    emitter->indention = 1;
-//
-//    return 1;
-//}
-//
-//static int
-//yaml_emitter_write_indicator(yaml_emitter_t *emitter,
-//        char *indicator, int need_whitespace,
-//        int is_whitespace, int is_indention)
-//{
-//    size_t indicator_length;
-//    yaml_string_t string;
-//
-//    indicator_length = strlen(indicator);
-//    STRING_ASSIGN(string, (yaml_char_t *)indicator, indicator_length);
-//
-//    if (need_whitespace && !emitter->whitespace) {
-//        if (!PUT(emitter, ' ')) return 0;
-//    }
-//
-//    while (string.pointer != string.end) {
-//        if (!WRITE(emitter, string)) return 0;
-//    }
-//
-//    emitter->whitespace = is_whitespace;
-//    emitter->indention = (emitter->indention && is_indention);
-//    emitter->open_ended = 0;
-//
-//    return 1;
-//}
-//
-//static int
-//yaml_emitter_write_anchor(yaml_emitter_t *emitter,
-//        yaml_char_t *value, size_t length)
-//{
-//    yaml_string_t string;
-//    STRING_ASSIGN(string, value, length);
-//
-//    while (string.pointer != string.end) {
-//        if (!WRITE(emitter, string)) return 0;
-//    }
-//
-//    emitter->whitespace = 0;
-//    emitter->indention = 0;
-//
-//    return 1;
-//}
-//
-//static int
-//yaml_emitter_write_tag_handle(yaml_emitter_t *emitter,
-//        yaml_char_t *value, size_t length)
-//{
-//    yaml_string_t string;
-//    STRING_ASSIGN(string, value, length);
-//
-//    if (!emitter->whitespace) {
-//        if (!PUT(emitter, ' ')) return 0;
-//    }
-//
-//    while (string.pointer != string.end) {
-//        if (!WRITE(emitter, string)) return 0;
-//    }
-//
-//    emitter->whitespace = 0;
-//    emitter->indention = 0;
-//
-//    return 1;
-//}
-//
-//static int
-//yaml_emitter_write_tag_content(yaml_emitter_t *emitter,
-//        yaml_char_t *value, size_t length,
-//        int need_whitespace)
-//{
-//    yaml_string_t string;
-//    STRING_ASSIGN(string, value, length);
-//
-//    if (need_whitespace && !emitter->whitespace) {
-//        if (!PUT(emitter, ' ')) return 0;
-//    }
-//
-//    while (string.pointer != string.end) {
-//        if (IS_ALPHA(string)
-//                || CHECK(string, ';') || CHECK(string, '/')
-//                || CHECK(string, '?') || CHECK(string, ':')
-//                || CHECK(string, '@') || CHECK(string, '&')
-//                || CHECK(string, '=') || CHECK(string, '+')
-//                || CHECK(string, '$') || CHECK(string, ',')
-//                || CHECK(string, '_') || CHECK(string, '.')
-//                || CHECK(string, '~') || CHECK(string, '*')
-//                || CHECK(string, '\'') || CHECK(string, '(')
-//                || CHECK(string, ')') || CHECK(string, '[')
-//                || CHECK(string, ']')) {
-//            if (!WRITE(emitter, string)) return 0;
-//        }
-//        else {
-//            int width = WIDTH(string);
-//            unsigned int value;
-//            while (width --) {
-//                value = *(string.pointer++);
-//                if (!PUT(emitter, '%')) return 0;
-//                if (!PUT(emitter, (value >> 4)
-//                            + ((value >> 4) < 10 ? '0' : 'A' - 10)))
-//                    return 0;
-//                if (!PUT(emitter, (value & 0x0F)
-//                            + ((value & 0x0F) < 10 ? '0' : 'A' - 10)))
-//                    return 0;
-//            }
-//        }
-//    }
-//
-//    emitter->whitespace = 0;
-//    emitter->indention = 0;
-//
-//    return 1;
-//}
-//
-//static int
-//yaml_emitter_write_plain_scalar(yaml_emitter_t *emitter,
-//        yaml_char_t *value, size_t length, int allow_breaks)
-//{
-//    yaml_string_t string;
-//    int spaces = 0;
-//    int breaks = 0;
-//
-//    STRING_ASSIGN(string, value, length);
-//
-//    if (!emitter->whitespace) {
-//        if (!PUT(emitter, ' ')) return 0;
-//    }
-//
-//    while (string.pointer != string.end)
-//    {
-//        if (IS_SPACE(string))
-//        {
-//            if (allow_breaks && !spaces
-//                    && emitter->column > emitter->best_width
-//                    && !IS_SPACE_AT(string, 1)) {
-//                if (!yaml_emitter_write_indent(emitter)) return 0;
-//                MOVE(string);
-//            }
-//            else {
-//                if (!WRITE(emitter, string)) return 0;
-//            }
-//            spaces = 1;
-//        }
-//        else if (IS_BREAK(string))
-//        {
-//            if (!breaks && CHECK(string, '\n')) {
-//                if (!PUT_BREAK(emitter)) return 0;
-//            }
-//            if (!WRITE_BREAK(emitter, string)) return 0;
-//            emitter->indention = 1;
-//            breaks = 1;
-//        }
-//        else
-//        {
-//            if (breaks) {
-//                if (!yaml_emitter_write_indent(emitter)) return 0;
-//            }
-//            if (!WRITE(emitter, string)) return 0;
-//            emitter->indention = 0;
-//            spaces = 0;
-//            breaks = 0;
-//        }
-//    }
-//
-//    emitter->whitespace = 0;
-//    emitter->indention = 0;
-//    if (emitter->root_context)
-//    {
-//        emitter->open_ended = 1;
-//    }
-//
-//    return 1;
-//}
-//
-//static int
-//yaml_emitter_write_single_quoted_scalar(yaml_emitter_t *emitter,
-//        yaml_char_t *value, size_t length, int allow_breaks)
-//{
-//    yaml_string_t string;
-//    int spaces = 0;
-//    int breaks = 0;
-//
-//    STRING_ASSIGN(string, value, length);
-//
-//    if (!yaml_emitter_write_indicator(emitter, "'", 1, 0, 0))
-//        return 0;
-//
-//    while (string.pointer != string.end)
-//    {
-//        if (IS_SPACE(string))
-//        {
-//            if (allow_breaks && !spaces
-//                    && emitter->column > emitter->best_width
-//                    && string.pointer != string.start
-//                    && string.pointer != string.end - 1
-//                    && !IS_SPACE_AT(string, 1)) {
-//                if (!yaml_emitter_write_indent(emitter)) return 0;
-//                MOVE(string);
-//            }
-//            else {
-//                if (!WRITE(emitter, string)) return 0;
-//            }
-//            spaces = 1;
-//        }
-//        else if (IS_BREAK(string))
-//        {
-//            if (!breaks && CHECK(string, '\n')) {
-//                if (!PUT_BREAK(emitter)) return 0;
-//            }
-//            if (!WRITE_BREAK(emitter, string)) return 0;
-//            emitter->indention = 1;
-//            breaks = 1;
-//        }
-//        else
-//        {
-//            if (breaks) {
-//                if (!yaml_emitter_write_indent(emitter)) return 0;
-//            }
-//            if (CHECK(string, '\'')) {
-//                if (!PUT(emitter, '\'')) return 0;
-//            }
-//            if (!WRITE(emitter, string)) return 0;
-//            emitter->indention = 0;
-//            spaces = 0;
-//            breaks = 0;
-//        }
-//    }
-//
-//    if (!yaml_emitter_write_indicator(emitter, "'", 0, 0, 0))
-//        return 0;
-//
-//    emitter->whitespace = 0;
-//    emitter->indention = 0;
-//
-//    return 1;
-//}
-//
-//static int
-//yaml_emitter_write_double_quoted_scalar(yaml_emitter_t *emitter,
-//        yaml_char_t *value, size_t length, int allow_breaks)
-//{
-//    yaml_string_t string;
-//    int spaces = 0;
-//
-//    STRING_ASSIGN(string, value, length);
-//
-//    if (!yaml_emitter_write_indicator(emitter, "\"", 1, 0, 0))
-//        return 0;
-//
-//    while (string.pointer != string.end)
-//    {
-//        if (!IS_PRINTABLE(string) || (!emitter->unicode && !IS_ASCII(string))
-//                || IS_BOM(string) || IS_BREAK(string)
-//                || CHECK(string, '"') || CHECK(string, '\\'))
-//        {
-//            unsigned char octet;
-//            unsigned int width;
-//            unsigned int value;
-//            int k;
-//
-//            octet = string.pointer[0];
-//            width = (octet & 0x80) == 0x00 ? 1 :
-//                    (octet & 0xE0) == 0xC0 ? 2 :
-//                    (octet & 0xF0) == 0xE0 ? 3 :
-//                    (octet & 0xF8) == 0xF0 ? 4 : 0;
-//            value = (octet & 0x80) == 0x00 ? octet & 0x7F :
-//                    (octet & 0xE0) == 0xC0 ? octet & 0x1F :
-//                    (octet & 0xF0) == 0xE0 ? octet & 0x0F :
-//                    (octet & 0xF8) == 0xF0 ? octet & 0x07 : 0;
-//            for (k = 1; k < (int)width; k ++) {
-//                octet = string.pointer[k];
-//                value = (value << 6) + (octet & 0x3F);
-//            }
-//            string.pointer += width;
-//
-//            if (!PUT(emitter, '\\')) return 0;
-//
-//            switch (value)
-//            {
-//                case 0x00:
-//                    if (!PUT(emitter, '0')) return 0;
-//                    break;
-//
-//                case 0x07:
-//                    if (!PUT(emitter, 'a')) return 0;
-//                    break;
-//
-//                case 0x08:
-//                    if (!PUT(emitter, 'b')) return 0;
-//                    break;
-//
-//                case 0x09:
-//                    if (!PUT(emitter, 't')) return 0;
-//                    break;
-//
-//                case 0x0A:
-//                    if (!PUT(emitter, 'n')) return 0;
-//                    break;
-//
-//                case 0x0B:
-//                    if (!PUT(emitter, 'v')) return 0;
-//                    break;
-//
-//                case 0x0C:
-//                    if (!PUT(emitter, 'f')) return 0;
-//                    break;
-//
-//                case 0x0D:
-//                    if (!PUT(emitter, 'r')) return 0;
-//                    break;
-//
-//                case 0x1B:
-//                    if (!PUT(emitter, 'e')) return 0;
-//                    break;
-//
-//                case 0x22:
-//                    if (!PUT(emitter, '\"')) return 0;
-//                    break;
-//
-//                case 0x5C:
-//                    if (!PUT(emitter, '\\')) return 0;
-//                    break;
-//
-//                case 0x85:
-//                    if (!PUT(emitter, 'N')) return 0;
-//                    break;
-//
-//                case 0xA0:
-//                    if (!PUT(emitter, '_')) return 0;
-//                    break;
-//
-//                case 0x2028:
-//                    if (!PUT(emitter, 'L')) return 0;
-//                    break;
-//
-//                case 0x2029:
-//                    if (!PUT(emitter, 'P')) return 0;
-//                    break;
-//
-//                default:
-//                    if (value <= 0xFF) {
-//                        if (!PUT(emitter, 'x')) return 0;
-//                        width = 2;
-//                    }
-//                    else if (value <= 0xFFFF) {
-//                        if (!PUT(emitter, 'u')) return 0;
-//                        width = 4;
-//                    }
-//                    else {
-//                        if (!PUT(emitter, 'U')) return 0;
-//                        width = 8;
-//                    }
-//                    for (k = (width-1)*4; k >= 0; k -= 4) {
-//                        int digit = (value >> k) & 0x0F;
-//                        if (!PUT(emitter, digit + (digit < 10 ? '0' : 'A'-10)))
-//                            return 0;
-//                    }
-//            }
-//            spaces = 0;
-//        }
-//        else if (IS_SPACE(string))
-//        {
-//            if (allow_breaks && !spaces
-//                    && emitter->column > emitter->best_width
-//                    && string.pointer != string.start
-//                    && string.pointer != string.end - 1) {
-//                if (!yaml_emitter_write_indent(emitter)) return 0;
-//                if (IS_SPACE_AT(string, 1)) {
-//                    if (!PUT(emitter, '\\')) return 0;
-//                }
-//                MOVE(string);
-//            }
-//            else {
-//                if (!WRITE(emitter, string)) return 0;
-//            }
-//            spaces = 1;
-//        }
-//        else
-//        {
-//            if (!WRITE(emitter, string)) return 0;
-//            spaces = 0;
-//        }
-//    }
-//
-//    if (!yaml_emitter_write_indicator(emitter, "\"", 0, 0, 0))
-//        return 0;
-//
-//    emitter->whitespace = 0;
-//    emitter->indention = 0;
-//
-//    return 1;
-//}
-//
-//static int
-//yaml_emitter_write_block_scalar_hints(yaml_emitter_t *emitter,
-//        yaml_string_t string)
-//{
-//    char indent_hint[2];
-//    char *chomp_hint = NULL;
-//
-//    if (IS_SPACE(string) || IS_BREAK(string))
-//    {
-//        indent_hint[0] = '0' + (char)emitter->best_indent;
-//        indent_hint[1] = '\0';
-//        if (!yaml_emitter_write_indicator(emitter, indent_hint, 0, 0, 0))
-//            return 0;
-//    }
-//
-//    emitter->open_ended = 0;
-//
-//    string.pointer = string.end;
-//    if (string.start == string.pointer)
-//    {
-//        chomp_hint = "-";
-//    }
-//    else
-//    {
-//        do {
-//            string.pointer --;
-//        } while ((*string.pointer & 0xC0) == 0x80);
-//        if (!IS_BREAK(string))
-//        {
-//            chomp_hint = "-";
-//        }
-//        else if (string.start == string.pointer)
-//        {
-//            chomp_hint = "+";
-//            emitter->open_ended = 1;
-//        }
-//        else
-//        {
-//            do {
-//                string.pointer --;
-//            } while ((*string.pointer & 0xC0) == 0x80);
-//            if (IS_BREAK(string))
-//            {
-//                chomp_hint = "+";
-//                emitter->open_ended = 1;
-//            }
-//        }
-//    }
-//
-//    if (chomp_hint)
-//    {
-//        if (!yaml_emitter_write_indicator(emitter, chomp_hint, 0, 0, 0))
-//            return 0;
-//    }
-//
-//    return 1;
-//}
-//
-//static int
-//yaml_emitter_write_literal_scalar(yaml_emitter_t *emitter,
-//        yaml_char_t *value, size_t length)
-//{
-//    yaml_string_t string;
-//    int breaks = 1;
-//
-//    STRING_ASSIGN(string, value, length);
-//
-//    if (!yaml_emitter_write_indicator(emitter, "|", 1, 0, 0))
-//        return 0;
-//    if (!yaml_emitter_write_block_scalar_hints(emitter, string))
-//        return 0;
-//    if (!PUT_BREAK(emitter)) return 0;
-//    emitter->indention = 1;
-//    emitter->whitespace = 1;
-//
-//    while (string.pointer != string.end)
-//    {
-//        if (IS_BREAK(string))
-//        {
-//            if (!WRITE_BREAK(emitter, string)) return 0;
-//            emitter->indention = 1;
-//            breaks = 1;
-//        }
-//        else
-//        {
-//            if (breaks) {
-//                if (!yaml_emitter_write_indent(emitter)) return 0;
-//            }
-//            if (!WRITE(emitter, string)) return 0;
-//            emitter->indention = 0;
-//            breaks = 0;
-//        }
-//    }
-//
-//    return 1;
-//}
-//
-//static int
-//yaml_emitter_write_folded_scalar(yaml_emitter_t *emitter,
-//        yaml_char_t *value, size_t length)
-//{
-//    yaml_string_t string;
-//    int breaks = 1;
-//    int leading_spaces = 1;
-//
-//    STRING_ASSIGN(string, value, length);
-//
-//    if (!yaml_emitter_write_indicator(emitter, ">", 1, 0, 0))
-//        return 0;
-//    if (!yaml_emitter_write_block_scalar_hints(emitter, string))
-//        return 0;
-//    if (!PUT_BREAK(emitter)) return 0;
-//    emitter->indention = 1;
-//    emitter->whitespace = 1;
-//
-//    while (string.pointer != string.end)
-//    {
-//        if (IS_BREAK(string))
-//        {
-//            if (!breaks && !leading_spaces && CHECK(string, '\n')) {
-//                int k = 0;
-//                while (IS_BREAK_AT(string, k)) {
-//                    k += WIDTH_AT(string, k);
-//                }
-//                if (!IS_BLANKZ_AT(string, k)) {
-//                    if (!PUT_BREAK(emitter)) return 0;
-//                }
-//            }
-//            if (!WRITE_BREAK(emitter, string)) return 0;
-//            emitter->indention = 1;
-//            breaks = 1;
-//        }
-//        else
-//        {
-//            if (breaks) {
-//                if (!yaml_emitter_write_indent(emitter)) return 0;
-//                leading_spaces = IS_BLANK(string);
-//            }
-//            if (!breaks && IS_SPACE(string) && !IS_SPACE_AT(string, 1)
-//                    && emitter->column > emitter->best_width) {
-//                if (!yaml_emitter_write_indent(emitter)) return 0;
-//                MOVE(string);
-//            }
-//            else {
-//                if (!WRITE(emitter, string)) return 0;
-//            }
-//            emitter->indention = 0;
-//            breaks = 0;
-//        }
-//    }
-//
-//    return 1;
-//}
-//
+import (
+	"bytes"
+)
+
+// Flush the buffer if needed.
+func flush(emitter *yaml_emitter_t) bool {
+	if emitter.buffer_pos+5 >= len(emitter.buffer) {
+		return yaml_emitter_flush(emitter)
+	}
+	return true
+}
+
+// Put a character to the output buffer.
+func put(emitter *yaml_emitter_t, value byte) bool {
+	if emitter.buffer_pos+5 >= len(emitter.buffer) && !yaml_emitter_flush(emitter) {
+		return false
+	}
+	emitter.buffer[emitter.buffer_pos] = value
+	emitter.buffer_pos++
+	emitter.column++
+	return true
+}
+
+// Put a line break to the output buffer.
+func put_break(emitter *yaml_emitter_t) bool {
+	if emitter.buffer_pos+5 >= len(emitter.buffer) && !yaml_emitter_flush(emitter) {
+		return false
+	}
+	switch emitter.line_break {
+	case yaml_CR_BREAK:
+		emitter.buffer[emitter.buffer_pos] = '\r'
+		emitter.buffer_pos += 1
+	case yaml_LN_BREAK:
+		emitter.buffer[emitter.buffer_pos] = '\n'
+		emitter.buffer_pos += 1
+	case yaml_CRLN_BREAK:
+		emitter.buffer[emitter.buffer_pos+0] = '\r'
+		emitter.buffer[emitter.buffer_pos+1] = '\n'
+		emitter.buffer_pos += 2
+	default:
+		panic("unknown line break setting")
+	}
+	emitter.column = 0
+	emitter.line++
+	return true
+}
+
+// Copy a character from a string into buffer.
+func write(emitter *yaml_emitter_t, s []byte, i *int) bool {
+	if emitter.buffer_pos+5 >= len(emitter.buffer) && !yaml_emitter_flush(emitter) {
+		return false
+	}
+	p := emitter.buffer_pos
+	w := width(s[*i])
+	switch w {
+	case 4:
+		emitter.buffer[p+3] = s[*i+3]
+		fallthrough
+	case 3:
+		emitter.buffer[p+2] = s[*i+2]
+		fallthrough
+	case 2:
+		emitter.buffer[p+1] = s[*i+1]
+		fallthrough
+	case 1:
+		emitter.buffer[p+0] = s[*i+0]
+	default:
+		panic("unknown character width")
+	}
+	emitter.column++
+	emitter.buffer_pos += w
+	*i += w
+	return true
+}
+
+// Write a whole string into buffer.
+func write_all(emitter *yaml_emitter_t, s []byte) bool {
+	for i := 0; i < len(s); {
+		if !write(emitter, s, &i) {
+			return false
+		}
+	}
+	return true
+}
+
+// Copy a line break character from a string into buffer.
+func write_break(emitter *yaml_emitter_t, s []byte, i *int) bool {
+	if s[*i] == '\n' {
+		if !put_break(emitter) {
+			return false
+		}
+		*i++
+	} else {
+		if !write(emitter, s, i) {
+			return false
+		}
+		emitter.column = 0
+		emitter.line++
+	}
+	return true
+}
+
+// Set an emitter error and return false.
+func yaml_emitter_set_emitter_error(emitter *yaml_emitter_t, problem string) bool {
+	emitter.error = yaml_EMITTER_ERROR
+	emitter.problem = problem
+	return false
+}
+
+// Emit an event.
+func yaml_emitter_emit(emitter *yaml_emitter_t, event *yaml_event_t) bool {
+	emitter.events = append(emitter.events, *event)
+	for !yaml_emitter_need_more_events(emitter) {
+		event := &emitter.events[emitter.events_head]
+		if !yaml_emitter_analyze_event(emitter, event) {
+			return false
+		}
+		if !yaml_emitter_state_machine(emitter, event) {
+			return false
+		}
+		yaml_event_delete(event)
+		emitter.events_head++
+	}
+	return true
+}
+
+// Check if we need to accumulate more events before emitting.
+//
+// We accumulate extra
+//  - 1 event for DOCUMENT-START
+//  - 2 events for SEQUENCE-START
+//  - 3 events for MAPPING-START
+//
+func yaml_emitter_need_more_events(emitter *yaml_emitter_t) bool {
+	if emitter.events_head == len(emitter.events) {
+		return true
+	}
+	var accumulate int
+	switch emitter.events[emitter.events_head].typ {
+	case yaml_DOCUMENT_START_EVENT:
+		accumulate = 1
+		break
+	case yaml_SEQUENCE_START_EVENT:
+		accumulate = 2
+		break
+	case yaml_MAPPING_START_EVENT:
+		accumulate = 3
+		break
+	default:
+		return false
+	}
+	if len(emitter.events)-emitter.events_head > accumulate {
+		return false
+	}
+	var level int
+	for i := emitter.events_head; i < len(emitter.events); i++ {
+		switch emitter.events[i].typ {
+		case yaml_STREAM_START_EVENT, yaml_DOCUMENT_START_EVENT, yaml_SEQUENCE_START_EVENT, yaml_MAPPING_START_EVENT:
+			level++
+		case yaml_STREAM_END_EVENT, yaml_DOCUMENT_END_EVENT, yaml_SEQUENCE_END_EVENT, yaml_MAPPING_END_EVENT:
+			level--
+		}
+		if level == 0 {
+			return false
+		}
+	}
+	return true
+}
+
+// Append a directive to the directives stack.
+func yaml_emitter_append_tag_directive(emitter *yaml_emitter_t, value *yaml_tag_directive_t, allow_duplicates bool) bool {
+	for i := 0; i < len(emitter.tag_directives); i++ {
+		if bytes.Equal(value.handle, emitter.tag_directives[i].handle) {
+			if allow_duplicates {
+				return true
+			}
+			return yaml_emitter_set_emitter_error(emitter, "duplicate %TAG directive")
+		}
+	}
+
+	// [Go] Do we actually need to copy this given garbage collection
+	// and the lack of deallocating destructors?
+	tag_copy := yaml_tag_directive_t{
+		handle: make([]byte, len(value.handle)),
+		prefix: make([]byte, len(value.prefix)),
+	}
+	copy(tag_copy.handle, value.handle)
+	copy(tag_copy.prefix, value.prefix)
+	emitter.tag_directives = append(emitter.tag_directives, tag_copy)
+	return true
+}
+
+// Increase the indentation level.
+func yaml_emitter_increase_indent(emitter *yaml_emitter_t, flow, indentless bool) bool {
+	emitter.indents = append(emitter.indents, emitter.indent)
+	if emitter.indent < 0 {
+		if flow {
+			emitter.indent = emitter.best_indent
+		} else {
+			emitter.indent = 0
+		}
+	} else if !indentless {
+		emitter.indent += emitter.best_indent
+	}
+	return true
+}
+
+// State dispatcher.
+func yaml_emitter_state_machine(emitter *yaml_emitter_t, event *yaml_event_t) bool {
+	switch emitter.state {
+	default:
+	case yaml_EMIT_STREAM_START_STATE:
+		return yaml_emitter_emit_stream_start(emitter, event)
+
+	case yaml_EMIT_FIRST_DOCUMENT_START_STATE:
+		return yaml_emitter_emit_document_start(emitter, event, true)
+
+	case yaml_EMIT_DOCUMENT_START_STATE:
+		return yaml_emitter_emit_document_start(emitter, event, false)
+
+	case yaml_EMIT_DOCUMENT_CONTENT_STATE:
+		return yaml_emitter_emit_document_content(emitter, event)
+
+	case yaml_EMIT_DOCUMENT_END_STATE:
+		return yaml_emitter_emit_document_end(emitter, event)
+
+	case yaml_EMIT_FLOW_SEQUENCE_FIRST_ITEM_STATE:
+		return yaml_emitter_emit_flow_sequence_item(emitter, event, true)
+
+	case yaml_EMIT_FLOW_SEQUENCE_ITEM_STATE:
+		return yaml_emitter_emit_flow_sequence_item(emitter, event, false)
+
+	case yaml_EMIT_FLOW_MAPPING_FIRST_KEY_STATE:
+		return yaml_emitter_emit_flow_mapping_key(emitter, event, true)
+
+	case yaml_EMIT_FLOW_MAPPING_KEY_STATE:
+		return yaml_emitter_emit_flow_mapping_key(emitter, event, false)
+
+	case yaml_EMIT_FLOW_MAPPING_SIMPLE_VALUE_STATE:
+		return yaml_emitter_emit_flow_mapping_value(emitter, event, true)
+
+	case yaml_EMIT_FLOW_MAPPING_VALUE_STATE:
+		return yaml_emitter_emit_flow_mapping_value(emitter, event, false)
+
+	case yaml_EMIT_BLOCK_SEQUENCE_FIRST_ITEM_STATE:
+		return yaml_emitter_emit_block_sequence_item(emitter, event, true)
+
+	case yaml_EMIT_BLOCK_SEQUENCE_ITEM_STATE:
+		return yaml_emitter_emit_block_sequence_item(emitter, event, false)
+
+	case yaml_EMIT_BLOCK_MAPPING_FIRST_KEY_STATE:
+		return yaml_emitter_emit_block_mapping_key(emitter, event, true)
+
+	case yaml_EMIT_BLOCK_MAPPING_KEY_STATE:
+		return yaml_emitter_emit_block_mapping_key(emitter, event, false)
+
+	case yaml_EMIT_BLOCK_MAPPING_SIMPLE_VALUE_STATE:
+		return yaml_emitter_emit_block_mapping_value(emitter, event, true)
+
+	case yaml_EMIT_BLOCK_MAPPING_VALUE_STATE:
+		return yaml_emitter_emit_block_mapping_value(emitter, event, false)
+
+	case yaml_EMIT_END_STATE:
+		return yaml_emitter_set_emitter_error(emitter, "expected nothing after STREAM-END")
+	}
+	panic("invalid emitter state")
+}
+
+// Expect STREAM-START.
+func yaml_emitter_emit_stream_start(emitter *yaml_emitter_t, event *yaml_event_t) bool {
+	if event.typ != yaml_STREAM_START_EVENT {
+		return yaml_emitter_set_emitter_error(emitter, "expected STREAM-START")
+	}
+	if emitter.encoding == yaml_ANY_ENCODING {
+		emitter.encoding = event.stream_start.encoding
+		if emitter.encoding == yaml_ANY_ENCODING {
+			emitter.encoding = yaml_UTF8_ENCODING
+		}
+	}
+	if emitter.best_indent < 2 || emitter.best_indent > 9 {
+		emitter.best_indent = 2
+	}
+	if emitter.best_width >= 0 && emitter.best_width <= emitter.best_indent*2 {
+		emitter.best_width = 80
+	}
+	if emitter.best_width < 0 {
+		emitter.best_width = 1<<31 - 1
+	}
+	if emitter.line_break == yaml_ANY_BREAK {
+		emitter.line_break = yaml_LN_BREAK
+	}
+
+	emitter.indent = -1
+	emitter.line = 0
+	emitter.column = 0
+	emitter.whitespace = true
+	emitter.indention = true
+
+	if emitter.encoding != yaml_UTF8_ENCODING {
+		if !yaml_emitter_write_bom(emitter) {
+			return false
+		}
+	}
+	emitter.state = yaml_EMIT_FIRST_DOCUMENT_START_STATE
+	return true
+}
+
+// Expect DOCUMENT-START or STREAM-END.
+func yaml_emitter_emit_document_start(emitter *yaml_emitter_t, event *yaml_event_t, first bool) bool {
+
+	if event.typ == yaml_DOCUMENT_START_EVENT {
+
+		if event.document_start.version_directive != nil {
+			if !yaml_emitter_analyze_version_directive(emitter, event.document_start.version_directive) {
+				return false
+			}
+		}
+
+		for i := 0; i < len(event.document_start.tag_directives); i++ {
+			tag_directive := &event.document_start.tag_directives[i]
+			if !yaml_emitter_analyze_tag_directive(emitter, tag_directive) {
+				return false
+			}
+			if !yaml_emitter_append_tag_directive(emitter, tag_directive, false) {
+				return false
+			}
+		}
+
+		for i := 0; i < len(default_tag_directives); i++ {
+			tag_directive := &default_tag_directives[i]
+			if !yaml_emitter_append_tag_directive(emitter, tag_directive, true) {
+				return false
+			}
+		}
+
+		implicit := event.document_start.implicit
+		if !first || emitter.canonical {
+			implicit = false
+		}
+
+		if emitter.open_ended && (event.document_start.version_directive != nil || len(event.document_start.tag_directives) > 0) {
+			if !yaml_emitter_write_indicator(emitter, []byte("..."), true, false, false) {
+				return false
+			}
+			if !yaml_emitter_write_indent(emitter) {
+				return false
+			}
+		}
+
+		if event.document_start.version_directive != nil {
+			implicit = false
+			if !yaml_emitter_write_indicator(emitter, []byte("%YAML"), true, false, false) {
+				return false
+			}
+			if !yaml_emitter_write_indicator(emitter, []byte("1.1"), true, false, false) {
+				return false
+			}
+			if !yaml_emitter_write_indent(emitter) {
+				return false
+			}
+		}
+
+		if len(event.document_start.tag_directives) > 0 {
+			implicit = false
+			for i := 0; i < len(event.document_start.tag_directives); i++ {
+				tag_directive := &event.document_start.tag_directives[i]
+				if !yaml_emitter_write_indicator(emitter, []byte("%TAG"), true, false, false) {
+					return false
+				}
+				if !yaml_emitter_write_tag_handle(emitter, tag_directive.handle) {
+					return false
+				}
+				if !yaml_emitter_write_tag_content(emitter, tag_directive.prefix, true) {
+					return false
+				}
+				if !yaml_emitter_write_indent(emitter) {
+					return false
+				}
+			}
+		}
+
+		if yaml_emitter_check_empty_document(emitter) {
+			implicit = false
+		}
+		if !implicit {
+			if !yaml_emitter_write_indent(emitter) {
+				return false
+			}
+			if !yaml_emitter_write_indicator(emitter, []byte("---"), true, false, false) {
+				return false
+			}
+			if emitter.canonical {
+				if !yaml_emitter_write_indent(emitter) {
+					return false
+				}
+			}
+		}
+
+		emitter.state = yaml_EMIT_DOCUMENT_CONTENT_STATE
+		return true
+	}
+
+	if event.typ == yaml_STREAM_END_EVENT {
+		if emitter.open_ended {
+			if !yaml_emitter_write_indicator(emitter, []byte("..."), true, false, false) {
+				return false
+			}
+			if !yaml_emitter_write_indent(emitter) {
+				return false
+			}
+		}
+		if !yaml_emitter_flush(emitter) {
+			return false
+		}
+		emitter.state = yaml_EMIT_END_STATE
+		return true
+	}
+
+	return yaml_emitter_set_emitter_error(emitter, "expected DOCUMENT-START or STREAM-END")
+}
+
+// Expect the root node.
+func yaml_emitter_emit_document_content(emitter *yaml_emitter_t, event *yaml_event_t) bool {
+	emitter.states = append(emitter.states, yaml_EMIT_DOCUMENT_END_STATE)
+	return yaml_emitter_emit_node(emitter, event, true, false, false, false)
+}
+
+// Expect DOCUMENT-END.
+func yaml_emitter_emit_document_end(emitter *yaml_emitter_t, event *yaml_event_t) bool {
+	if event.typ != yaml_DOCUMENT_END_EVENT {
+		return yaml_emitter_set_emitter_error(emitter, "expected DOCUMENT-END")
+	}
+	if !yaml_emitter_write_indent(emitter) {
+		return false
+	}
+	if !event.document_end.implicit {
+		// [Go] Allocate the slice elsewhere.
+		if !yaml_emitter_write_indicator(emitter, []byte("..."), true, false, false) {
+			return false
+		}
+		if !yaml_emitter_write_indent(emitter) {
+			return false
+		}
+	}
+	if !yaml_emitter_flush(emitter) {
+		return false
+	}
+	emitter.state = yaml_EMIT_DOCUMENT_START_STATE
+	emitter.tag_directives = emitter.tag_directives[:0]
+	return true
+}
+
+// Expect a flow item node.
+func yaml_emitter_emit_flow_sequence_item(emitter *yaml_emitter_t, event *yaml_event_t, first bool) bool {
+	if first {
+		if !yaml_emitter_write_indicator(emitter, []byte{'['}, true, true, false) {
+			return false
+		}
+		if !yaml_emitter_increase_indent(emitter, true, false) {
+			return false
+		}
+		emitter.flow_level++
+	}
+
+	if event.typ == yaml_SEQUENCE_END_EVENT {
+		emitter.flow_level--
+		emitter.indent = emitter.indents[len(emitter.indents)-1]
+		emitter.indents = emitter.indents[:len(emitter.indents)-1]
+		if emitter.canonical && !first {
+			if !yaml_emitter_write_indicator(emitter, []byte{','}, false, false, false) {
+				return false
+			}
+			if !yaml_emitter_write_indent(emitter) {
+				return false
+			}
+		}
+		if !yaml_emitter_write_indicator(emitter, []byte{']'}, false, false, false) {
+			return false
+		}
+		emitter.state = emitter.states[len(emitter.states)-1]
+		emitter.states = emitter.states[:len(emitter.states)-1]
+
+		return true
+	}
+
+	if !first {
+		if !yaml_emitter_write_indicator(emitter, []byte{','}, false, false, false) {
+			return false
+		}
+	}
+
+	if emitter.canonical || emitter.column > emitter.best_width {
+		if !yaml_emitter_write_indent(emitter) {
+			return false
+		}
+	}
+	emitter.states = append(emitter.states, yaml_EMIT_FLOW_SEQUENCE_ITEM_STATE)
+	return yaml_emitter_emit_node(emitter, event, false, true, false, false)
+}
+
+// Expect a flow key node.
+func yaml_emitter_emit_flow_mapping_key(emitter *yaml_emitter_t, event *yaml_event_t, first bool) bool {
+	if first {
+		if !yaml_emitter_write_indicator(emitter, []byte{'{'}, true, true, false) {
+			return false
+		}
+		if !yaml_emitter_increase_indent(emitter, true, false) {
+			return false
+		}
+		emitter.flow_level++
+	}
+
+	if event.typ == yaml_MAPPING_END_EVENT {
+		emitter.flow_level--
+		emitter.indent = emitter.indents[len(emitter.indents)-1]
+		emitter.indents = emitter.indents[:len(emitter.indents)-1]
+		if emitter.canonical && !first {
+			if !yaml_emitter_write_indicator(emitter, []byte{','}, false, false, false) {
+				return false
+			}
+			if !yaml_emitter_write_indent(emitter) {
+				return false
+			}
+		}
+		if !yaml_emitter_write_indicator(emitter, []byte{'}'}, false, false, false) {
+			return false
+		}
+		emitter.state = emitter.states[len(emitter.states)-1]
+		emitter.states = emitter.states[:len(emitter.states)-1]
+		return true
+	}
+
+	if !first {
+		if !yaml_emitter_write_indicator(emitter, []byte{','}, false, false, false) {
+			return false
+		}
+	}
+	if emitter.canonical || emitter.column > emitter.best_width {
+		if !yaml_emitter_write_indent(emitter) {
+			return false
+		}
+	}
+
+	if !emitter.canonical && yaml_emitter_check_simple_key(emitter) {
+		emitter.states = append(emitter.states, yaml_EMIT_FLOW_MAPPING_SIMPLE_VALUE_STATE)
+		return yaml_emitter_emit_node(emitter, event, false, false, true, true)
+	} else {
+		if !yaml_emitter_write_indicator(emitter, []byte{'?'}, true, false, false) {
+			return false
+		}
+		emitter.states = append(emitter.states, yaml_EMIT_FLOW_MAPPING_VALUE_STATE)
+		return yaml_emitter_emit_node(emitter, event, false, false, true, false)
+	}
+}
+
+// Expect a flow value node.
+func yaml_emitter_emit_flow_mapping_value(emitter *yaml_emitter_t, event *yaml_event_t, simple bool) bool {
+	if simple {
+		if !yaml_emitter_write_indicator(emitter, []byte{':'}, false, false, false) {
+			return false
+		}
+	} else {
+		if emitter.canonical || emitter.column > emitter.best_width {
+			if !yaml_emitter_write_indent(emitter) {
+				return false
+			}
+		}
+		if !yaml_emitter_write_indicator(emitter, []byte{':'}, true, false, false) {
+			return false
+		}
+	}
+	emitter.states = append(emitter.states, yaml_EMIT_FLOW_MAPPING_KEY_STATE)
+	return yaml_emitter_emit_node(emitter, event, false, false, true, false)
+}
+
+// Expect a block item node.
+func yaml_emitter_emit_block_sequence_item(emitter *yaml_emitter_t, event *yaml_event_t, first bool) bool {
+	if first {
+		if !yaml_emitter_increase_indent(emitter, false, emitter.mapping_context && !emitter.indention) {
+			return false
+		}
+	}
+	if event.typ == yaml_SEQUENCE_END_EVENT {
+		emitter.indent = emitter.indents[len(emitter.indents)-1]
+		emitter.indents = emitter.indents[:len(emitter.indents)-1]
+		emitter.state = emitter.states[len(emitter.states)-1]
+		emitter.states = emitter.states[:len(emitter.states)-1]
+		return true
+	}
+	if !yaml_emitter_write_indent(emitter) {
+		return false
+	}
+	if !yaml_emitter_write_indicator(emitter, []byte{'-'}, true, false, true) {
+		return false
+	}
+	emitter.states = append(emitter.states, yaml_EMIT_BLOCK_SEQUENCE_ITEM_STATE)
+	return yaml_emitter_emit_node(emitter, event, false, true, false, false)
+}
+
+// Expect a block key node.
+func yaml_emitter_emit_block_mapping_key(emitter *yaml_emitter_t, event *yaml_event_t, first bool) bool {
+	if first {
+		if !yaml_emitter_increase_indent(emitter, false, false) {
+			return false
+		}
+	}
+	if event.typ == yaml_MAPPING_END_EVENT {
+		emitter.indent = emitter.indents[len(emitter.indents)-1]
+		emitter.indents = emitter.indents[:len(emitter.indents)-1]
+		emitter.state = emitter.states[len(emitter.states)-1]
+		emitter.states = emitter.states[:len(emitter.states)-1]
+		return true
+	}
+	if !yaml_emitter_write_indent(emitter) {
+		return false
+	}
+	if yaml_emitter_check_simple_key(emitter) {
+		emitter.states = append(emitter.states, yaml_EMIT_BLOCK_MAPPING_SIMPLE_VALUE_STATE)
+		return yaml_emitter_emit_node(emitter, event, false, false, true, true)
+	} else {
+		if !yaml_emitter_write_indicator(emitter, []byte{'?'}, true, false, true) {
+			return false
+		}
+		emitter.states = append(emitter.states, yaml_EMIT_BLOCK_MAPPING_VALUE_STATE)
+		return yaml_emitter_emit_node(emitter, event, false, false, true, false)
+	}
+}
+
+// Expect a block value node.
+func yaml_emitter_emit_block_mapping_value(emitter *yaml_emitter_t, event *yaml_event_t, simple bool) bool {
+	if simple {
+		if !yaml_emitter_write_indicator(emitter, []byte{':'}, false, false, false) {
+			return false
+		}
+	} else {
+		if !yaml_emitter_write_indent(emitter) {
+			return false
+		}
+		if !yaml_emitter_write_indicator(emitter, []byte{':'}, true, false, true) {
+			return false
+		}
+	}
+	emitter.states = append(emitter.states, yaml_EMIT_BLOCK_MAPPING_KEY_STATE)
+	return yaml_emitter_emit_node(emitter, event, false, false, true, false)
+}
+
+// Expect a node.
+func yaml_emitter_emit_node(emitter *yaml_emitter_t, event *yaml_event_t,
+	root bool, sequence bool, mapping bool, simple_key bool) bool {
+
+	emitter.root_context = root
+	emitter.sequence_context = sequence
+	emitter.mapping_context = mapping
+	emitter.simple_key_context = simple_key
+
+	switch event.typ {
+	case yaml_ALIAS_EVENT:
+		return yaml_emitter_emit_alias(emitter, event)
+	case yaml_SCALAR_EVENT:
+		return yaml_emitter_emit_scalar(emitter, event)
+	case yaml_SEQUENCE_START_EVENT:
+		return yaml_emitter_emit_sequence_start(emitter, event)
+	case yaml_MAPPING_START_EVENT:
+		return yaml_emitter_emit_mapping_start(emitter, event)
+	default:
+		return yaml_emitter_set_emitter_error(emitter,
+			"expected SCALAR, SEQUENCE-START, MAPPING-START, or ALIAS")
+	}
+	return false
+}
+
+// Expect ALIAS.
+func yaml_emitter_emit_alias(emitter *yaml_emitter_t, event *yaml_event_t) bool {
+	if !yaml_emitter_process_anchor(emitter) {
+		return false
+	}
+	emitter.state = emitter.states[len(emitter.states)-1]
+	emitter.states = emitter.states[:len(emitter.states)-1]
+	return true
+}
+
+// Expect SCALAR.
+func yaml_emitter_emit_scalar(emitter *yaml_emitter_t, event *yaml_event_t) bool {
+	if !yaml_emitter_select_scalar_style(emitter, event) {
+		return false
+	}
+	if !yaml_emitter_process_anchor(emitter) {
+		return false
+	}
+	if !yaml_emitter_process_tag(emitter) {
+		return false
+	}
+	if !yaml_emitter_increase_indent(emitter, true, false) {
+		return false
+	}
+	if !yaml_emitter_process_scalar(emitter) {
+		return false
+	}
+	emitter.indent = emitter.indents[len(emitter.indents)-1]
+	emitter.indents = emitter.indents[:len(emitter.indents)-1]
+	emitter.state = emitter.states[len(emitter.states)-1]
+	emitter.states = emitter.states[:len(emitter.states)-1]
+	return true
+}
+
+// Expect SEQUENCE-START.
+func yaml_emitter_emit_sequence_start(emitter *yaml_emitter_t, event *yaml_event_t) bool {
+	if !yaml_emitter_process_anchor(emitter) {
+		return false
+	}
+	if !yaml_emitter_process_tag(emitter) {
+		return false
+	}
+	if emitter.flow_level > 0 || emitter.canonical ||
+		event.sequence_start.style == yaml_FLOW_SEQUENCE_STYLE ||
+		yaml_emitter_check_empty_sequence(emitter) {
+		emitter.state = yaml_EMIT_FLOW_SEQUENCE_FIRST_ITEM_STATE
+	} else {
+		emitter.state = yaml_EMIT_BLOCK_SEQUENCE_FIRST_ITEM_STATE
+	}
+	return true
+}
+
+// Expect MAPPING-START.
+func yaml_emitter_emit_mapping_start(emitter *yaml_emitter_t, event *yaml_event_t) bool {
+	if !yaml_emitter_process_anchor(emitter) {
+		return false
+	}
+	if !yaml_emitter_process_tag(emitter) {
+		return false
+	}
+	if emitter.flow_level > 0 || emitter.canonical ||
+		event.mapping_start.style == yaml_FLOW_MAPPING_STYLE ||
+		yaml_emitter_check_empty_mapping(emitter) {
+		emitter.state = yaml_EMIT_FLOW_MAPPING_FIRST_KEY_STATE
+	} else {
+		emitter.state = yaml_EMIT_BLOCK_MAPPING_FIRST_KEY_STATE
+	}
+	return true
+}
+
+// Check if the document content is an empty scalar.
+func yaml_emitter_check_empty_document(emitter *yaml_emitter_t) bool {
+	return false // [Go] Huh?
+}
+
+// Check if the next events represent an empty sequence.
+func yaml_emitter_check_empty_sequence(emitter *yaml_emitter_t) bool {
+	if len(emitter.events)-emitter.events_head < 2 {
+		return false
+	}
+	return emitter.events[emitter.events_head].typ == yaml_SEQUENCE_START_EVENT &&
+		emitter.events[emitter.events_head+1].typ == yaml_SEQUENCE_END_EVENT
+}
+
+// Check if the next events represent an empty mapping.
+func yaml_emitter_check_empty_mapping(emitter *yaml_emitter_t) bool {
+	if len(emitter.events)-emitter.events_head < 2 {
+		return false
+	}
+	return emitter.events[emitter.events_head].typ == yaml_MAPPING_START_EVENT &&
+		emitter.events[emitter.events_head+1].typ == yaml_MAPPING_END_EVENT
+}
+
+// Check if the next node can be expressed as a simple key.
+func yaml_emitter_check_simple_key(emitter *yaml_emitter_t) bool {
+	length := 0
+	switch emitter.events[emitter.events_head].typ {
+	case yaml_ALIAS_EVENT:
+		length += len(emitter.anchor_data.anchor)
+	case yaml_SCALAR_EVENT:
+		if emitter.scalar_data.multiline {
+			return false
+		}
+		length += len(emitter.anchor_data.anchor) +
+			len(emitter.tag_data.handle) +
+			len(emitter.tag_data.suffix) +
+			len(emitter.scalar_data.value)
+	case yaml_SEQUENCE_START_EVENT:
+		if !yaml_emitter_check_empty_sequence(emitter) {
+			return false
+		}
+		length += len(emitter.anchor_data.anchor) +
+			len(emitter.tag_data.handle) +
+			len(emitter.tag_data.suffix)
+	case yaml_MAPPING_START_EVENT:
+		if !yaml_emitter_check_empty_mapping(emitter) {
+			return false
+		}
+		length += len(emitter.anchor_data.anchor) +
+			len(emitter.tag_data.handle) +
+			len(emitter.tag_data.suffix)
+	default:
+		return false
+	}
+	return length <= 128
+}
+
+// Determine an acceptable scalar style.
+func yaml_emitter_select_scalar_style(emitter *yaml_emitter_t, event *yaml_event_t) bool {
+
+	no_tag := len(emitter.tag_data.handle) == 0 && len(emitter.tag_data.suffix) == 0
+	if no_tag && !event.scalar.plain_implicit && !event.scalar.quoted_implicit {
+		return yaml_emitter_set_emitter_error(emitter, "neither tag nor implicit flags are specified")
+	}
+
+	style := event.scalar.style
+	if style == yaml_ANY_SCALAR_STYLE {
+		style = yaml_PLAIN_SCALAR_STYLE
+	}
+	if emitter.canonical {
+		style = yaml_DOUBLE_QUOTED_SCALAR_STYLE
+	}
+	if emitter.simple_key_context && emitter.scalar_data.multiline {
+		style = yaml_DOUBLE_QUOTED_SCALAR_STYLE
+	}
+
+	if style == yaml_PLAIN_SCALAR_STYLE {
+		if emitter.flow_level > 0 && !emitter.scalar_data.flow_plain_allowed ||
+			emitter.flow_level == 0 && !emitter.scalar_data.block_plain_allowed {
+			style = yaml_SINGLE_QUOTED_SCALAR_STYLE
+		}
+		if len(emitter.scalar_data.value) == 0 && (emitter.flow_level > 0 || emitter.simple_key_context) {
+			style = yaml_SINGLE_QUOTED_SCALAR_STYLE
+		}
+		if no_tag && !event.scalar.plain_implicit {
+			style = yaml_SINGLE_QUOTED_SCALAR_STYLE
+		}
+	}
+	if style == yaml_SINGLE_QUOTED_SCALAR_STYLE {
+		if !emitter.scalar_data.single_quoted_allowed {
+			style = yaml_DOUBLE_QUOTED_SCALAR_STYLE
+		}
+	}
+	if style == yaml_LITERAL_SCALAR_STYLE || style == yaml_FOLDED_SCALAR_STYLE {
+		if !emitter.scalar_data.block_allowed || emitter.flow_level > 0 || emitter.simple_key_context {
+			style = yaml_DOUBLE_QUOTED_SCALAR_STYLE
+		}
+	}
+
+	if no_tag && !event.scalar.quoted_implicit && style != yaml_PLAIN_SCALAR_STYLE {
+		emitter.tag_data.handle = []byte{'!'}
+	}
+	emitter.scalar_data.style = style
+	return true
+}
+
+// Write an achor.
+func yaml_emitter_process_anchor(emitter *yaml_emitter_t) bool {
+	if emitter.anchor_data.anchor == nil {
+		return true
+	}
+	c := []byte{'&'}
+	if emitter.anchor_data.alias {
+		c[0] = '*'
+	}
+	if !yaml_emitter_write_indicator(emitter, c, true, false, false) {
+		return false
+	}
+	return yaml_emitter_write_anchor(emitter, emitter.anchor_data.anchor)
+}
+
+// Write a tag.
+func yaml_emitter_process_tag(emitter *yaml_emitter_t) bool {
+	if len(emitter.tag_data.handle) == 0 && len(emitter.tag_data.suffix) == 0 {
+		return true
+	}
+	if len(emitter.tag_data.handle) > 0 {
+		if !yaml_emitter_write_tag_handle(emitter, emitter.tag_data.handle) {
+			return false
+		}
+		if len(emitter.tag_data.suffix) > 0 {
+			if !yaml_emitter_write_tag_content(emitter, emitter.tag_data.suffix, false) {
+				return false
+			}
+		}
+	} else {
+		// [Go] Allocate these slices elsewhere.
+		if !yaml_emitter_write_indicator(emitter, []byte("!<"), true, false, false) {
+			return false
+		}
+		if !yaml_emitter_write_tag_content(emitter, emitter.tag_data.suffix, false) {
+			return false
+		}
+		if !yaml_emitter_write_indicator(emitter, []byte{'>'}, false, false, false) {
+			return false
+		}
+	}
+	return true
+}
+
+// Write a scalar.
+func yaml_emitter_process_scalar(emitter *yaml_emitter_t) bool {
+	switch emitter.scalar_data.style {
+	case yaml_PLAIN_SCALAR_STYLE:
+		return yaml_emitter_write_plain_scalar(emitter, emitter.scalar_data.value, !emitter.simple_key_context)
+
+	case yaml_SINGLE_QUOTED_SCALAR_STYLE:
+		return yaml_emitter_write_single_quoted_scalar(emitter, emitter.scalar_data.value, !emitter.simple_key_context)
+
+	case yaml_DOUBLE_QUOTED_SCALAR_STYLE:
+		return yaml_emitter_write_double_quoted_scalar(emitter, emitter.scalar_data.value, !emitter.simple_key_context)
+
+	case yaml_LITERAL_SCALAR_STYLE:
+		return yaml_emitter_write_literal_scalar(emitter, emitter.scalar_data.value)
+
+	case yaml_FOLDED_SCALAR_STYLE:
+		return yaml_emitter_write_folded_scalar(emitter, emitter.scalar_data.value)
+	}
+	panic("unknown scalar style")
+}
+
+// Check if a %YAML directive is valid.
+func yaml_emitter_analyze_version_directive(emitter *yaml_emitter_t, version_directive *yaml_version_directive_t) bool {
+	if version_directive.major != 1 || version_directive.minor != 1 {
+		return yaml_emitter_set_emitter_error(emitter, "incompatible %YAML directive")
+	}
+	return true
+}
+
+// Check if a %TAG directive is valid.
+func yaml_emitter_analyze_tag_directive(emitter *yaml_emitter_t, tag_directive *yaml_tag_directive_t) bool {
+	handle := tag_directive.handle
+	prefix := tag_directive.prefix
+	if len(handle) == 0 {
+		return yaml_emitter_set_emitter_error(emitter, "tag handle must not be empty")
+	}
+	if handle[0] != '!' {
+		return yaml_emitter_set_emitter_error(emitter, "tag handle must start with '!'")
+	}
+	if handle[len(handle)-1] != '!' {
+		return yaml_emitter_set_emitter_error(emitter, "tag handle must end with '!'")
+	}
+	for i := 1; i < len(handle)-1; i += width(handle[i]) {
+		if !is_alpha(handle, i) {
+			return yaml_emitter_set_emitter_error(emitter, "tag handle must contain alphanumerical characters only")
+		}
+	}
+	if len(prefix) == 0 {
+		return yaml_emitter_set_emitter_error(emitter, "tag prefix must not be empty")
+	}
+	return true
+}
+
+// Check if an anchor is valid.
+func yaml_emitter_analyze_anchor(emitter *yaml_emitter_t, anchor []byte, alias bool) bool {
+	if len(anchor) == 0 {
+		problem := "anchor value must not be empty"
+		if alias {
+			problem = "alias value must not be empty"
+		}
+		return yaml_emitter_set_emitter_error(emitter, problem)
+	}
+	for i := 0; i < len(anchor); i += width(anchor[i]) {
+		if !is_alpha(anchor, i) {
+			problem := "anchor value must contain alphanumerical characters only"
+			if alias {
+				problem = "alias value must contain alphanumerical characters only"
+			}
+			return yaml_emitter_set_emitter_error(emitter, problem)
+		}
+	}
+	emitter.anchor_data.anchor = anchor
+	emitter.anchor_data.alias = alias
+	return true
+}
+
+// Check if a tag is valid.
+func yaml_emitter_analyze_tag(emitter *yaml_emitter_t, tag []byte) bool {
+	if len(tag) == 0 {
+		return yaml_emitter_set_emitter_error(emitter, "tag value must not be empty")
+	}
+	for i := 0; i < len(emitter.tag_directives); i++ {
+		tag_directive := &emitter.tag_directives[i]
+		if bytes.HasPrefix(tag, tag_directive.prefix) {
+			emitter.tag_data.handle = tag_directive.handle
+			emitter.tag_data.suffix = tag[len(tag_directive.prefix):]
+		}
+		return true
+	}
+	emitter.tag_data.suffix = tag
+	return true
+}
+
+// Check if a scalar is valid.
+func yaml_emitter_analyze_scalar(emitter *yaml_emitter_t, value []byte) bool {
+	var (
+		block_indicators   = false
+		flow_indicators    = false
+		line_breaks        = false
+		special_characters = false
+
+		leading_space  = false
+		leading_break  = false
+		trailing_space = false
+		trailing_break = false
+		break_space    = false
+		space_break    = false
+
+		preceeded_by_whitespace = false
+		followed_by_whitespace  = false
+		previous_space          = false
+		previous_break          = false
+	)
+
+	emitter.scalar_data.value = value
+
+	if len(value) == 0 {
+		emitter.scalar_data.multiline = false
+		emitter.scalar_data.flow_plain_allowed = false
+		emitter.scalar_data.block_plain_allowed = true
+		emitter.scalar_data.single_quoted_allowed = true
+		emitter.scalar_data.block_allowed = false
+		return true
+	}
+
+	if (value[0] == '-' && value[1] == '-' && value[2] == '-') || (value[0] == '.' && value[1] == '.' && value[2] == '.') {
+		block_indicators = true
+		flow_indicators = true
+	}
+
+	preceeded_by_whitespace = true
+	for i, w := 0, 0; i < len(value); i += w {
+		w = width(value[0])
+		followed_by_whitespace = i+w >= len(value) || is_blank(value, i+w)
+
+		if i == 0 {
+			switch value[i] {
+			case '#', ',', '[', ']', '{', '}', '&', '*', '!', '|', '>', '\'', '"', '%', '@', '`':
+				flow_indicators = true
+				block_indicators = true
+			case '?', ':':
+				flow_indicators = true
+				if followed_by_whitespace {
+					block_indicators = true
+				}
+			case '-':
+				if followed_by_whitespace {
+					flow_indicators = true
+					block_indicators = true
+				}
+			}
+		} else {
+			switch value[i] {
+			case ',', '?', '[', ']', '{', '}':
+				flow_indicators = true
+			case ':':
+				flow_indicators = true
+				if followed_by_whitespace {
+					block_indicators = true
+				}
+			case '#':
+				if preceeded_by_whitespace {
+					flow_indicators = true
+					block_indicators = true
+				}
+			}
+		}
+
+		if !is_printable(value, i) || !is_ascii(value, i) && !emitter.unicode {
+			special_characters = true
+		}
+		if is_space(value, i) {
+			if i == 0 {
+				leading_space = true
+			}
+			if i+width(value[i]) == len(value) {
+				trailing_space = true
+			}
+			if previous_break {
+				break_space = true
+			}
+			previous_space = true
+			previous_break = false
+		} else if is_break(value, i) {
+			line_breaks = true
+			if i == 0 {
+				leading_break = true
+			}
+			if i+width(value[i]) == len(value) {
+				trailing_break = true
+			}
+			if previous_space {
+				space_break = true
+			}
+			previous_space = false
+			previous_break = true
+		} else {
+			previous_space = false
+			previous_break = false
+		}
+
+		// [Go]: Why 'z'? Couldn't be the end of the string as that's the loop condition.
+		preceeded_by_whitespace = is_blankz(value, i)
+	}
+
+	emitter.scalar_data.multiline = line_breaks
+	emitter.scalar_data.flow_plain_allowed = true
+	emitter.scalar_data.block_plain_allowed = true
+	emitter.scalar_data.single_quoted_allowed = true
+	emitter.scalar_data.block_allowed = true
+
+	if leading_space || leading_break || trailing_space || trailing_break {
+		emitter.scalar_data.flow_plain_allowed = false
+		emitter.scalar_data.block_plain_allowed = false
+	}
+	if trailing_space {
+		emitter.scalar_data.block_allowed = false
+	}
+	if break_space {
+		emitter.scalar_data.flow_plain_allowed = false
+		emitter.scalar_data.block_plain_allowed = false
+		emitter.scalar_data.single_quoted_allowed = false
+	}
+	if space_break || special_characters {
+		emitter.scalar_data.flow_plain_allowed = false
+		emitter.scalar_data.block_plain_allowed = false
+		emitter.scalar_data.single_quoted_allowed = false
+		emitter.scalar_data.block_allowed = false
+	}
+	if line_breaks {
+		emitter.scalar_data.flow_plain_allowed = false
+		emitter.scalar_data.block_plain_allowed = false
+	}
+	if flow_indicators {
+		emitter.scalar_data.flow_plain_allowed = false
+	}
+	if block_indicators {
+		emitter.scalar_data.block_plain_allowed = false
+	}
+	return true
+}
+
+// Check if the event data is valid.
+func yaml_emitter_analyze_event(emitter *yaml_emitter_t, event *yaml_event_t) bool {
+
+	emitter.anchor_data.anchor = nil
+	emitter.tag_data.handle = nil
+	emitter.tag_data.suffix = nil
+	emitter.scalar_data.value = nil
+
+	switch event.typ {
+	case yaml_ALIAS_EVENT:
+		if !yaml_emitter_analyze_anchor(emitter, event.alias.anchor, true) {
+			return false
+		}
+
+	case yaml_SCALAR_EVENT:
+		if len(event.scalar.anchor) > 0 {
+			if !yaml_emitter_analyze_anchor(emitter, event.scalar.anchor, false) {
+				return false
+			}
+		}
+		if len(event.scalar.tag) > 0 && (emitter.canonical || (!event.scalar.plain_implicit && !event.scalar.quoted_implicit)) {
+			if !yaml_emitter_analyze_tag(emitter, event.scalar.tag) {
+				return false
+			}
+		}
+		if !yaml_emitter_analyze_scalar(emitter, event.scalar.value) {
+			return false
+		}
+
+	case yaml_SEQUENCE_START_EVENT:
+		if len(event.sequence_start.anchor) > 0 {
+			if !yaml_emitter_analyze_anchor(emitter, event.sequence_start.anchor, false) {
+				return false
+			}
+		}
+		if len(event.sequence_start.tag) > 0 && (emitter.canonical || !event.sequence_start.implicit) {
+			if !yaml_emitter_analyze_tag(emitter, event.sequence_start.tag) {
+				return false
+			}
+		}
+
+	case yaml_MAPPING_START_EVENT:
+		if len(event.mapping_start.anchor) > 0 {
+			if !yaml_emitter_analyze_anchor(emitter, event.mapping_start.anchor, false) {
+				return false
+			}
+		}
+		if len(event.mapping_start.tag) > 0 && (emitter.canonical || !event.mapping_start.implicit) {
+			if !yaml_emitter_analyze_tag(emitter, event.mapping_start.tag) {
+				return false
+			}
+		}
+	}
+	return true
+}
+
+// Write the BOM character.
+func yaml_emitter_write_bom(emitter *yaml_emitter_t) bool {
+	if !flush(emitter) {
+		return false
+	}
+	pos := emitter.buffer_pos
+	emitter.buffer[pos+0] = '\xEF'
+	emitter.buffer[pos+1] = '\xBB'
+	emitter.buffer[pos+2] = '\xBF'
+	emitter.buffer_pos += 3
+	return true
+}
+
+func yaml_emitter_write_indent(emitter *yaml_emitter_t) bool {
+	indent := emitter.indent
+	if indent < 0 {
+		indent = 0
+	}
+	if !emitter.indention || emitter.column > indent || (emitter.column == indent && !emitter.whitespace) {
+		if !put_break(emitter) {
+			return false
+		}
+	}
+	for emitter.column < indent {
+		if !put(emitter, ' ') {
+			return false
+		}
+	}
+	emitter.whitespace = true
+	emitter.indention = true
+	return true
+}
+
+func yaml_emitter_write_indicator(emitter *yaml_emitter_t, indicator []byte, need_whitespace, is_whitespace, is_indention bool) bool {
+	if need_whitespace && !emitter.whitespace {
+		if !put(emitter, ' ') {
+			return false
+		}
+	}
+	if !write_all(emitter, indicator) {
+		return false
+	}
+	emitter.whitespace = is_whitespace
+	emitter.indention = (emitter.indention && is_indention)
+	emitter.open_ended = false
+	return true
+}
+
+func yaml_emitter_write_anchor(emitter *yaml_emitter_t, value []byte) bool {
+	if !write_all(emitter, value) {
+		return false
+	}
+	emitter.whitespace = false
+	emitter.indention = false
+	return true
+}
+
+func yaml_emitter_write_tag_handle(emitter *yaml_emitter_t, value []byte) bool {
+	if !emitter.whitespace {
+		if !put(emitter, ' ') {
+			return false
+		}
+	}
+	if !write_all(emitter, value) {
+		return false
+	}
+	emitter.whitespace = false
+	emitter.indention = false
+	return true
+}
+
+func yaml_emitter_write_tag_content(emitter *yaml_emitter_t, value []byte, need_whitespace bool) bool {
+	if need_whitespace && !emitter.whitespace {
+		if !put(emitter, ' ') {
+			return false
+		}
+	}
+	for i := 0; i < len(value); {
+		var must_write bool
+		switch value[i] {
+		case ';', '/', '?', ':', '@', '&', '=', '+', '$', ',', '_', '.', '~', '*', '\'', '(', ')', '[', ']':
+			must_write = true
+		default:
+			must_write = is_alpha(value, i)
+		}
+		if must_write {
+			if !write(emitter, value, &i) {
+				return false
+			}
+		} else {
+			w := width(value[i])
+			for k := 0; k < w; k++ {
+				octet := value[i]
+				i++
+
+				c := octet >> 4
+				if c < 10 {
+					c += '0'
+				} else {
+					c += 'A' - 10
+				}
+				if !put(emitter, c) {
+					return false
+				}
+
+				c = octet & 0x0f
+				if c < 10 {
+					c += '0'
+				} else {
+					c += 'A' - 10
+				}
+				if !put(emitter, c) {
+					return false
+				}
+			}
+		}
+	}
+	emitter.whitespace = false
+	emitter.indention = false
+	return true
+}
+
+func yaml_emitter_write_plain_scalar(emitter *yaml_emitter_t, value []byte, allow_breaks bool) bool {
+	if !emitter.whitespace {
+		if !put(emitter, ' ') {
+			return false
+		}
+	}
+
+	spaces := false
+	breaks := false
+	for i := 0; i < len(value); {
+		if is_space(value, i) {
+			if allow_breaks && !spaces && emitter.column > emitter.best_width && !is_space(value, i+1) {
+				if !yaml_emitter_write_indent(emitter) {
+					return false
+				}
+				i += width(value[i])
+			} else {
+				if !write(emitter, value, &i) {
+					return false
+				}
+			}
+			spaces = true
+		} else if is_break(value, i) {
+			if !breaks && value[i] == '\n' {
+				if !put_break(emitter) {
+					return false
+				}
+			}
+			if !write_break(emitter, value, &i) {
+				return false
+			}
+			emitter.indention = true
+			breaks = true
+		} else {
+			if breaks {
+				if !yaml_emitter_write_indent(emitter) {
+					return false
+				}
+			}
+			if !write(emitter, value, &i) {
+				return false
+			}
+			emitter.indention = false
+			spaces = false
+			breaks = false
+		}
+	}
+
+	emitter.whitespace = false
+	emitter.indention = false
+	if emitter.root_context {
+		emitter.open_ended = true
+	}
+
+	return true
+}
+
+func yaml_emitter_write_single_quoted_scalar(emitter *yaml_emitter_t, value []byte, allow_breaks bool) bool {
+
+	if !yaml_emitter_write_indicator(emitter, []byte{'\''}, true, false, false) {
+		return false
+	}
+
+	spaces := false
+	breaks := false
+	for i := 0; i < len(value); {
+		if is_space(value, i) {
+			if allow_breaks && !spaces && emitter.column > emitter.best_width && i > 0 && i < len(value)-1 && !is_space(value, i+1) {
+				if !yaml_emitter_write_indent(emitter) {
+					return false
+				}
+				i += width(value[i])
+			} else {
+				if !write(emitter, value, &i) {
+					return false
+				}
+			}
+			spaces = true
+		} else if is_break(value, i) {
+			if !breaks && value[i] == '\n' {
+				if !put_break(emitter) {
+					return false
+				}
+			}
+			if !write_break(emitter, value, &i) {
+				return false
+			}
+			emitter.indention = true
+			breaks = true
+		} else {
+			if breaks {
+				if !yaml_emitter_write_indent(emitter) {
+					return false
+				}
+			}
+			if value[i] == '\'' {
+				if !put(emitter, '\'') {
+					return false
+				}
+			}
+			if !write(emitter, value, &i) {
+				return false
+			}
+			emitter.indention = false
+			spaces = false
+			breaks = false
+		}
+	}
+	if !yaml_emitter_write_indicator(emitter, []byte{'\''}, false, false, false) {
+		return false
+	}
+	emitter.whitespace = false
+	emitter.indention = false
+	return true
+}
+
+func yaml_emitter_write_double_quoted_scalar(emitter *yaml_emitter_t, value []byte, allow_breaks bool) bool {
+	spaces := false
+	if !yaml_emitter_write_indicator(emitter, []byte{'"'}, true, false, false) {
+		return false
+	}
+
+	for i := 0; i < len(value); {
+		if !is_printable(value, i) || (!emitter.unicode && !is_ascii(value, i)) ||
+			is_bom(value, i) || is_break(value, i) ||
+			value[i] == '"' || value[i] == '\\' {
+
+			octet := value[i]
+
+			var w int
+			var v rune
+			switch {
+			case octet&0x80 == 0x00:
+				w, v = 1, rune(octet&0x7F)
+			case octet&0xE0 == 0xC0:
+				w, v = 2, rune(octet&0x1F)
+			case octet&0xF0 == 0xE0:
+				w, v = 3, rune(octet&0x0F)
+			case octet&0xF8 == 0xF0:
+				w, v = 4, rune(octet&0x07)
+			}
+			for k := 1; k < w; k++ {
+				octet = value[i+k]
+				v = (v << 6) + (rune(octet) & 0x3F)
+			}
+			i += w
+
+			if !put(emitter, '\\') {
+				return false
+			}
+
+			var ok bool
+			switch v {
+			case 0x00:
+				ok = put(emitter, '0')
+			case 0x07:
+				ok = put(emitter, 'a')
+			case 0x08:
+				ok = put(emitter, 'b')
+			case 0x09:
+				ok = put(emitter, 't')
+			case 0x0A:
+				ok = put(emitter, 'n')
+			case 0x0b:
+				ok = put(emitter, 'v')
+			case 0x0c:
+				ok = put(emitter, 'f')
+			case 0x0d:
+				ok = put(emitter, 'r')
+			case 0x1b:
+				ok = put(emitter, 'e')
+			case 0x22:
+				ok = put(emitter, '"')
+			case 0x5c:
+				ok = put(emitter, '\\')
+			case 0x85:
+				ok = put(emitter, 'N')
+			case 0xA0:
+				ok = put(emitter, '_')
+			case 0x2028:
+				ok = put(emitter, 'L')
+			case 0x2029:
+				ok = put(emitter, 'P')
+			default:
+				if v <= 0xFF {
+					ok = put(emitter, 'x')
+					w= 2
+				} else if v <= 0xFFFF {
+					ok = put(emitter, 'u')
+					w= 4
+				} else {
+					ok = put(emitter, 'U')
+					w= 8
+				}
+				for k := (w - 1) * 4; ok && k >= 0; k -= 4 {
+					digit := byte((v >> uint(k)) & 0x0F)
+					if digit < 10 {
+						ok = put(emitter, digit+'0')
+					} else {
+						ok = put(emitter, digit+'A'-10)
+					}
+				}
+			}
+			if !ok {
+				return false
+			}
+			spaces = false
+		} else if is_space(value, i) {
+			if allow_breaks && !spaces && emitter.column > emitter.best_width && i > 0 && i < len(value)-1 {
+				if !yaml_emitter_write_indent(emitter) {
+					return false
+				}
+				if is_space(value, i+1) {
+					if !put(emitter, '\\') {
+						return false
+					}
+				}
+				i += width(value[i])
+			} else if !write(emitter, value, &i) {
+				return false
+			}
+			spaces = true
+		} else {
+			if !write(emitter, value, &i) {
+				return false
+			}
+			spaces = false
+		}
+	}
+	if !yaml_emitter_write_indicator(emitter, []byte{'"'}, false, false, false) {
+		return false
+	}
+	emitter.whitespace = false
+	emitter.indention = false
+	return true
+}
+
+func yaml_emitter_write_block_scalar_hints(emitter *yaml_emitter_t, value []byte) bool {
+	if is_space(value, 0) || is_break(value, 0) {
+		indent_hint := []byte{'0' + byte(emitter.best_indent)}
+		if !yaml_emitter_write_indicator(emitter, indent_hint, false, false, false) {
+			return false
+		}
+	}
+
+	emitter.open_ended = false
+
+	var chomp_hint [1]byte
+	if len(value) == 0 {
+		chomp_hint[0] = '-'
+	} else {
+		i := len(value) - 1
+		for value[i]&0xC0 == 0x80 {
+			i--
+		}
+		if !is_break(value, i) {
+			chomp_hint[0] = '-'
+		} else if i == 0 {
+			chomp_hint[0] = '+'
+			emitter.open_ended = true
+		} else {
+			i--
+			for value[i]&0xC0 == 0x80 {
+				i--
+			}
+			if is_break(value, i) {
+				chomp_hint[0] = '+'
+				emitter.open_ended = true
+			}
+		}
+	}
+	if chomp_hint[0] != 0 {
+		if !yaml_emitter_write_indicator(emitter, chomp_hint[:], false, false, false) {
+			return false
+		}
+	}
+	return true
+}
+
+func yaml_emitter_write_literal_scalar(emitter *yaml_emitter_t, value []byte) bool {
+	if !yaml_emitter_write_indicator(emitter, []byte{'|'}, true, false, false) {
+		return false
+	}
+	if !yaml_emitter_write_block_scalar_hints(emitter, value) {
+		return false
+	}
+	if !put_break(emitter) {
+		return false
+	}
+	emitter.indention = true
+	emitter.whitespace = true
+	breaks := true
+	for i := 0; i < len(value); {
+		if is_break(value, i) {
+			if !write_break(emitter, value, &i) {
+				return false
+			}
+			emitter.indention = true
+			breaks = true
+		} else {
+			if breaks {
+				if !yaml_emitter_write_indent(emitter) {
+					return false
+				}
+			}
+			if !write(emitter, value, &i) {
+				return false
+			}
+			emitter.indention = false
+			breaks = false
+		}
+	}
+
+	return true
+}
+
+func yaml_emitter_write_folded_scalar(emitter *yaml_emitter_t, value []byte) bool {
+	if !yaml_emitter_write_indicator(emitter, []byte{'>'}, true, false, false) {
+		return false
+	}
+	if !yaml_emitter_write_block_scalar_hints(emitter, value) {
+		return false
+	}
+
+	if !put_break(emitter) {
+		return false
+	}
+	emitter.indention = true
+	emitter.whitespace = true
+
+	breaks := true
+	leading_spaces := true
+	for i := 0; i < len(value); {
+		if is_break(value, i) {
+			if !breaks && !leading_spaces && value[i] == '\n' {
+				k := 0
+				for is_break(value, k) {
+					k += width(value[k])
+				}
+				if !is_blankz(value, k) {
+					if !put_break(emitter) {
+						return false
+					}
+				}
+			}
+			if !write_break(emitter, value, &i) {
+				return false
+			}
+			emitter.indention = true
+			breaks = true
+		} else {
+			if breaks {
+				if !yaml_emitter_write_indent(emitter) {
+					return false
+				}
+				leading_spaces = is_blank(value, i)
+			}
+			if !breaks && is_space(value, i) && !is_space(value, i+1) && emitter.column > emitter.best_width {
+				if !yaml_emitter_write_indent(emitter) {
+					return false
+				}
+				i += width(value[i])
+			} else {
+				if !write(emitter, value, &i) {
+					return false
+				}
+			}
+			emitter.indention = false
+			breaks = false
+		}
+	}
+	return true
+}

encode.go

@@ -1,88 +1,56 @@
 package goyaml
 
-// #cgo LDFLAGS: -lm -lpthread
-// #cgo windows CFLAGS: -DYAML_DECLARE_STATIC=1 -Dstrdup=_strdup
-// #cgo CFLAGS: -I. -DHAVE_CONFIG_H=1
-//
-// #include "helpers.h"
-import "C"
-
 import (
 	"reflect"
 	"sort"
 	"strconv"
-	"unsafe"
 )
 
 type encoder struct {
-	emitter C.yaml_emitter_t
-	event   C.yaml_event_t
+	emitter yaml_emitter_t
+	event   yaml_event_t
 	out     []byte
-	tmp     []byte
-	tmph    *reflect.SliceHeader
 	flow    bool
 }
 
-//export outputHandler
-func outputHandler(data unsafe.Pointer, buffer *C.uchar, size C.size_t) C.int {
-	e := (*encoder)(data)
-	e.tmph.Data = uintptr(unsafe.Pointer(buffer))
-	e.tmph.Len = int(size)
-	e.tmph.Cap = int(size)
-	e.out = append(e.out, e.tmp...)
-	return 1
-}
-
 func newEncoder() (e *encoder) {
 	e = &encoder{}
-	e.tmph = (*reflect.SliceHeader)(unsafe.Pointer(&e.tmp))
-	if C.yaml_emitter_initialize(&e.emitter) == 0 {
-		panic("Failed to initialize YAML emitter")
-	}
-	C.set_output_handler(&e.emitter)
-	C.yaml_stream_start_event_initialize(&e.event, C.YAML_UTF8_ENCODING)
+	e.must(yaml_emitter_initialize(&e.emitter))
+	yaml_emitter_set_output_string(&e.emitter, &e.out)
+	e.must(yaml_stream_start_event_initialize(&e.event, yaml_UTF8_ENCODING))
 	e.emit()
-	C.yaml_document_start_event_initialize(&e.event, nil, nil, nil, 1)
+	e.must(yaml_document_start_event_initialize(&e.event, nil, nil, true))
 	e.emit()
 	return e
 }
 
 func (e *encoder) finish() {
-	C.yaml_document_end_event_initialize(&e.event, 1)
+	e.must(yaml_document_end_event_initialize(&e.event, true))
 	e.emit()
-	e.emitter.open_ended = 0
-	C.yaml_stream_end_event_initialize(&e.event)
+	e.emitter.open_ended = false
+	e.must(yaml_stream_end_event_initialize(&e.event))
 	e.emit()
 }
 
 func (e *encoder) destroy() {
-	C.yaml_emitter_delete(&e.emitter)
+	yaml_emitter_delete(&e.emitter)
 }
 
 func (e *encoder) emit() {
 	// This will internally delete the e.event value.
-	if C.yaml_emitter_emit(&e.emitter, &e.event) == 0 &&
-		e.event._type != C.YAML_DOCUMENT_END_EVENT &&
-		e.event._type != C.YAML_STREAM_END_EVENT {
-		if e.emitter.error == C.YAML_EMITTER_ERROR {
-			// XXX TESTME
-			panic("YAML emitter error: " + C.GoString(e.emitter.problem))
-		} else {
-			// XXX TESTME
-			panic("Unknown YAML emitter error")
-		}
+	if !yaml_emitter_emit(&e.emitter, &e.event) && e.event.typ != yaml_DOCUMENT_END_EVENT && e.event.typ != yaml_STREAM_END_EVENT {
+		e.must(false)
 	}
 }
 
-func (e *encoder) fail(msg string) {
-	if msg == "" {
-		if e.emitter.problem != nil {
-			msg = C.GoString(e.emitter.problem)
-		} else {
+func (e *encoder) must(ok bool) {
+	if !ok {
+		msg := e.emitter.problem
+		if msg == "" {
 			msg = "Unknown problem generating YAML content"
 		}
+		panic(msg)
 	}
-	panic(msg)
 }
 
 func (e *encoder) marshal(tag string, in reflect.Value) {
@@ -159,62 +127,43 @@ func (e *encoder) structv(tag string, in reflect.Value) {
 }
 
 func (e *encoder) mappingv(tag string, f func()) {
-	var ctag *C.yaml_char_t
-	var free func()
-	cimplicit := C.int(1)
-	if tag != "" {
-		ctag, free = ystr(tag)
-		defer free()
-		cimplicit = 0
-	}
-	cstyle := C.yaml_mapping_style_t(C.YAML_BLOCK_MAPPING_STYLE)
+	implicit := tag == ""
+	style := yaml_BLOCK_MAPPING_STYLE
 	if e.flow {
 		e.flow = false
-		cstyle = C.YAML_FLOW_MAPPING_STYLE
+		style = yaml_FLOW_MAPPING_STYLE
 	}
-	C.yaml_mapping_start_event_initialize(&e.event, nil, ctag, cimplicit,
-		cstyle)
+	e.must(yaml_mapping_start_event_initialize(&e.event, nil, []byte(tag), implicit, style))
 	e.emit()
 	f()
-	C.yaml_mapping_end_event_initialize(&e.event)
+	e.must(yaml_mapping_end_event_initialize(&e.event))
 	e.emit()
 }
 
 func (e *encoder) slicev(tag string, in reflect.Value) {
-	var ctag *C.yaml_char_t
-	var free func()
-	var cimplicit C.int
-	if tag != "" {
-		ctag, free = ystr(tag)
-		defer free()
-		cimplicit = 0
-	} else {
-		cimplicit = 1
-	}
-
-	cstyle := C.yaml_sequence_style_t(C.YAML_BLOCK_SEQUENCE_STYLE)
+	implicit := tag == ""
+	style := yaml_BLOCK_SEQUENCE_STYLE
 	if e.flow {
 		e.flow = false
-		cstyle = C.YAML_FLOW_SEQUENCE_STYLE
+		style = yaml_FLOW_SEQUENCE_STYLE
 	}
-	C.yaml_sequence_start_event_initialize(&e.event, nil, ctag, cimplicit,
-		cstyle)
+	e.must(yaml_sequence_start_event_initialize(&e.event, nil, []byte(tag), implicit, style))
 	e.emit()
 	n := in.Len()
 	for i := 0; i < n; i++ {
 		e.marshal("", in.Index(i))
 	}
-	C.yaml_sequence_end_event_initialize(&e.event)
+	e.must(yaml_sequence_end_event_initialize(&e.event))
 	e.emit()
 }
 
 func (e *encoder) stringv(tag string, in reflect.Value) {
-	var style C.yaml_scalar_style_t
+	var style yaml_scalar_style_t
 	s := in.String()
 	if rtag, _ := resolve("", s); rtag != "!!str" {
-		style = C.YAML_DOUBLE_QUOTED_SCALAR_STYLE
+		style = yaml_DOUBLE_QUOTED_SCALAR_STYLE
 	} else {
-		style = C.YAML_PLAIN_SCALAR_STYLE
+		style = yaml_PLAIN_SCALAR_STYLE
 	}
 	e.emitScalar(s, "", tag, style)
 }
@@ -226,17 +175,17 @@ func (e *encoder) boolv(tag string, in reflect.Value) {
 	} else {
 		s = "false"
 	}
-	e.emitScalar(s, "", tag, C.YAML_PLAIN_SCALAR_STYLE)
+	e.emitScalar(s, "", tag, yaml_PLAIN_SCALAR_STYLE)
 }
 
 func (e *encoder) intv(tag string, in reflect.Value) {
 	s := strconv.FormatInt(in.Int(), 10)
-	e.emitScalar(s, "", tag, C.YAML_PLAIN_SCALAR_STYLE)
+	e.emitScalar(s, "", tag, yaml_PLAIN_SCALAR_STYLE)
 }
 
 func (e *encoder) uintv(tag string, in reflect.Value) {
 	s := strconv.FormatUint(in.Uint(), 10)
-	e.emitScalar(s, "", tag, C.YAML_PLAIN_SCALAR_STYLE)
+	e.emitScalar(s, "", tag, yaml_PLAIN_SCALAR_STYLE)
 }
 
 func (e *encoder) floatv(tag string, in reflect.Value) {
@@ -250,42 +199,18 @@ func (e *encoder) floatv(tag string, in reflect.Value) {
 	case "NaN":
 		s = ".nan"
 	}
-	e.emitScalar(s, "", tag, C.YAML_PLAIN_SCALAR_STYLE)
+	e.emitScalar(s, "", tag, yaml_PLAIN_SCALAR_STYLE)
 }
 
 func (e *encoder) nilv() {
-	e.emitScalar("null", "", "", C.YAML_PLAIN_SCALAR_STYLE)
+	e.emitScalar("null", "", "", yaml_PLAIN_SCALAR_STYLE)
 }
 
-func (e *encoder) emitScalar(value, anchor, tag string, style C.yaml_scalar_style_t) {
-	var canchor, ctag, cvalue *C.yaml_char_t
-	var cimplicit C.int
-	var free func()
-	if anchor != "" {
-		canchor, free = ystr(anchor)
-		defer free()
-	}
-	if tag != "" {
-		ctag, free = ystr(tag)
-		defer free()
-		cimplicit = 0
-		style = C.YAML_PLAIN_SCALAR_STYLE
-	} else {
-		cimplicit = 1
-	}
-	cvalue, free = ystr(value)
-	defer free()
-	size := C.int(len(value))
-	if C.yaml_scalar_event_initialize(&e.event, canchor, ctag, cvalue, size,
-		cimplicit, cimplicit, style) == 0 {
-		e.fail("")
+func (e *encoder) emitScalar(value, anchor, tag string, style yaml_scalar_style_t) {
+	implicit := tag == ""
+	if !implicit {
+		style = yaml_PLAIN_SCALAR_STYLE
 	}
+	e.must(yaml_scalar_event_initialize(&e.event, []byte(anchor), []byte(tag), []byte(value), implicit, implicit, style))
 	e.emit()
 }
-
-func ystr(s string) (ys *C.yaml_char_t, free func()) {
-	up := unsafe.Pointer(C.CString(s))
-	ys = (*C.yaml_char_t)(up)
-	free = func() { C.free(up) }
-	return ys, free
-}

helpers.c

@@ -1,18 +0,0 @@
-#include "_cgo_export.h"
-#include "helpers.h"
-
-#define DEFINE_YUNION_FUNC(name) \
-    __typeof__(((yaml_event_t *)0)->data.name) * \
-    event_##name(yaml_event_t *event) { \
-        return &event->data.name; \
-    }
-
-DEFINE_YUNION_FUNC(scalar)
-DEFINE_YUNION_FUNC(alias)
-DEFINE_YUNION_FUNC(mapping_start)
-DEFINE_YUNION_FUNC(sequence_start)
-
-void set_output_handler(yaml_emitter_t *e)
-{
-    yaml_emitter_set_output(e, (yaml_write_handler_t*)outputHandler, (void *)e);
-}

helpers.h

@@ -1,20 +0,0 @@
-#ifndef helpers_h
-#define helpers_h
-
-#define CGO_LDFLAGS "-lm -lpthread"
-#define CGO_CFLAGS "-I. -DHAVE_CONFIG_H=1"
-
-#include <yaml.h>
-
-#define DECLARE_YUNION_FUNC(name) \
-    __typeof__(((yaml_event_t *)0)->data.name) *\
-    event_##name(yaml_event_t *event);
-
-DECLARE_YUNION_FUNC(scalar)
-DECLARE_YUNION_FUNC(alias)
-DECLARE_YUNION_FUNC(mapping_start)
-DECLARE_YUNION_FUNC(sequence_start)
-
-void set_output_handler(yaml_emitter_t *e);
-
-#endif

scanner_c.go

@@ -512,10 +512,8 @@ func skip_line(parser *yaml_parser_t) {
 
 // Copy a character to a string buffer and advance pointers.
 func read(parser *yaml_parser_t, s *[]byte) bool {
-	buf := parser.buffer
-	pos := parser.buffer_pos
-	w := width(buf[0])
-	*s = append(*s, buf[pos:pos+w]...)
+	w := width(parser.buffer[0])
+	*s = append(*s, parser.buffer[parser.buffer_pos:parser.buffer_pos+w]...)
 	parser.buffer_pos += w
 	parser.mark.index++
 	parser.mark.column++

writer.c

@@ -1,141 +0,0 @@
-
-#include "yaml_private.h"
-
-/*
- * Declarations.
- */
-
-static int
-yaml_emitter_set_writer_error(yaml_emitter_t *emitter, const char *problem);
-
-YAML_DECLARE(int)
-yaml_emitter_flush(yaml_emitter_t *emitter);
-
-/*
- * Set the writer error and return 0.
- */
-
-static int
-yaml_emitter_set_writer_error(yaml_emitter_t *emitter, const char *problem)
-{
-    emitter->error = YAML_WRITER_ERROR;
-    emitter->problem = problem;
-
-    return 0;
-}
-
-/*
- * Flush the output buffer.
- */
-
-YAML_DECLARE(int)
-yaml_emitter_flush(yaml_emitter_t *emitter)
-{
-    int low, high;
-
-    assert(emitter);    /* Non-NULL emitter object is expected. */
-    assert(emitter->write_handler); /* Write handler must be set. */
-    assert(emitter->encoding);  /* Output encoding must be set. */
-
-    emitter->buffer.last = emitter->buffer.pointer;
-    emitter->buffer.pointer = emitter->buffer.start;
-
-    /* Check if the buffer is empty. */
-
-    if (emitter->buffer.start == emitter->buffer.last) {
-        return 1;
-    }
-
-    /* If the output encoding is UTF-8, we don't need to recode the buffer. */
-
-    if (emitter->encoding == YAML_UTF8_ENCODING)
-    {
-        if (emitter->write_handler(emitter->write_handler_data,
-                    emitter->buffer.start,
-                    emitter->buffer.last - emitter->buffer.start)) {
-            emitter->buffer.last = emitter->buffer.start;
-            emitter->buffer.pointer = emitter->buffer.start;
-            return 1;
-        }
-        else {
-            return yaml_emitter_set_writer_error(emitter, "write error");
-        }
-    }
-
-    /* Recode the buffer into the raw buffer. */
-
-    low = (emitter->encoding == YAML_UTF16LE_ENCODING ? 0 : 1);
-    high = (emitter->encoding == YAML_UTF16LE_ENCODING ? 1 : 0);
-
-    while (emitter->buffer.pointer != emitter->buffer.last)
-    {
-        unsigned char octet;
-        unsigned int width;
-        unsigned int value;
-        size_t k;
-
-        /* 
-         * See the "reader.c" code for more details on UTF-8 encoding.  Note
-         * that we assume that the buffer contains a valid UTF-8 sequence.
-         */
-
-        /* Read the next UTF-8 character. */
-
-        octet = emitter->buffer.pointer[0];
-
-        width = (octet & 0x80) == 0x00 ? 1 :
-                (octet & 0xE0) == 0xC0 ? 2 :
-                (octet & 0xF0) == 0xE0 ? 3 :
-                (octet & 0xF8) == 0xF0 ? 4 : 0;
-
-        value = (octet & 0x80) == 0x00 ? octet & 0x7F :
-                (octet & 0xE0) == 0xC0 ? octet & 0x1F :
-                (octet & 0xF0) == 0xE0 ? octet & 0x0F :
-                (octet & 0xF8) == 0xF0 ? octet & 0x07 : 0;
-
-        for (k = 1; k < width; k ++) {
-            octet = emitter->buffer.pointer[k];
-            value = (value << 6) + (octet & 0x3F);
-        }
-
-        emitter->buffer.pointer += width;
-
-        /* Write the character. */
-
-        if (value < 0x10000)
-        {
-            emitter->raw_buffer.last[high] = value >> 8;
-            emitter->raw_buffer.last[low] = value & 0xFF;
-
-            emitter->raw_buffer.last += 2;
-        }
-        else
-        {
-            /* Write the character using a surrogate pair (check "reader.c"). */
-
-            value -= 0x10000;
-            emitter->raw_buffer.last[high] = 0xD8 + (value >> 18);
-            emitter->raw_buffer.last[low] = (value >> 10) & 0xFF;
-            emitter->raw_buffer.last[high+2] = 0xDC + ((value >> 8) & 0xFF);
-            emitter->raw_buffer.last[low+2] = value & 0xFF;
-
-            emitter->raw_buffer.last += 4;
-        }
-    }
-
-    /* Write the raw buffer. */
-
-    if (emitter->write_handler(emitter->write_handler_data,
-                emitter->raw_buffer.start,
-                emitter->raw_buffer.last - emitter->raw_buffer.start)) {
-        emitter->buffer.last = emitter->buffer.start;
-        emitter->buffer.pointer = emitter->buffer.start;
-        emitter->raw_buffer.last = emitter->raw_buffer.start;
-        emitter->raw_buffer.pointer = emitter->raw_buffer.start;
-        return 1;
-    }
-    else {
-        return yaml_emitter_set_writer_error(emitter, "write error");
-    }
-}
-

writer_c.go

@@ -14,16 +14,16 @@ func yaml_emitter_flush(emitter *yaml_emitter_t) bool {
 	}
 
 	// Check if the buffer is empty.
-	if len(emitter.buffer) == 0 {
+	if emitter.buffer_pos == 0 {
 		return true
 	}
 
 	// If the output encoding is UTF-8, we don't need to recode the buffer.
 	if emitter.encoding == yaml_UTF8_ENCODING {
-		if err := emitter.write_handler(emitter, emitter.buffer); err != nil {
+		if err := emitter.write_handler(emitter, emitter.buffer[:emitter.buffer_pos]); err != nil {
 			return yaml_emitter_set_writer_error(emitter, "write error: "+err.Error())
 		}
-		emitter.buffer = emitter.buffer[:0]
+		emitter.buffer_pos = 0
 		return true
 	}
 
@@ -36,7 +36,7 @@ func yaml_emitter_flush(emitter *yaml_emitter_t) bool {
 	}
 
 	pos := 0
-	for pos < len(emitter.buffer) {
+	for pos < emitter.buffer_pos {
 		// See the "reader.c" code for more details on UTF-8 encoding.  Note
 		// that we assume that the buffer contains a valid UTF-8 sequence.
 
@@ -83,7 +83,7 @@ func yaml_emitter_flush(emitter *yaml_emitter_t) bool {
 	if err := emitter.write_handler(emitter, emitter.raw_buffer); err != nil {
 		return yaml_emitter_set_writer_error(emitter, "write error: "+err.Error())
 	}
-	emitter.buffer = emitter.buffer[:0]
+	emitter.buffer_pos = 0
 	emitter.raw_buffer = emitter.raw_buffer[:0]
 	return true
 }

yaml.h

@@ -1,1971 +0,0 @@
-/**
- * @file yaml.h
- * @brief Public interface for libyaml.
- * 
- * Include the header file with the code:
- * @code
- * #include <yaml.h>
- * @endcode
- */
-
-#ifndef YAML_H
-#define YAML_H
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-
-/**
- * @defgroup export Export Definitions
- * @{
- */
-
-/** The public API declaration. */
-
-#ifdef WIN32
-#   if defined(YAML_DECLARE_STATIC)
-#       define  YAML_DECLARE(type)  type
-#   elif defined(YAML_DECLARE_EXPORT)
-#       define  YAML_DECLARE(type)  __declspec(dllexport) type
-#   else
-#       define  YAML_DECLARE(type)  __declspec(dllimport) type
-#   endif
-#else
-#   define  YAML_DECLARE(type)  type
-#endif
-
-/** @} */
-
-/**
- * @defgroup version Version Information
- * @{
- */
-
-/**
- * Get the library version as a string.
- *
- * @returns The function returns the pointer to a static string of the form
- * @c "X.Y.Z", where @c X is the major version number, @c Y is a minor version
- * number, and @c Z is the patch version number.
- */
-
-YAML_DECLARE(const char *)
-yaml_get_version_string(void);
-
-/**
- * Get the library version numbers.
- *
- * @param[out]      major   Major version number.
- * @param[out]      minor   Minor version number.
- * @param[out]      patch   Patch version number.
- */
-
-YAML_DECLARE(void)
-yaml_get_version(int *major, int *minor, int *patch);
-
-/** @} */
-
-/**
- * @defgroup basic Basic Types
- * @{
- */
-
-/** The character type (UTF-8 octet). */
-typedef unsigned char yaml_char_t;
-
-/** The version directive data. */
-typedef struct yaml_version_directive_s {
-    /** The major version number. */
-    int major;
-    /** The minor version number. */
-    int minor;
-} yaml_version_directive_t;
-
-/** The tag directive data. */
-typedef struct yaml_tag_directive_s {
-    /** The tag handle. */
-    yaml_char_t *handle;
-    /** The tag prefix. */
-    yaml_char_t *prefix;
-} yaml_tag_directive_t;
-
-/** The stream encoding. */
-typedef enum yaml_encoding_e {
-    /** Let the parser choose the encoding. */
-    YAML_ANY_ENCODING,
-    /** The default UTF-8 encoding. */
-    YAML_UTF8_ENCODING,
-    /** The UTF-16-LE encoding with BOM. */
-    YAML_UTF16LE_ENCODING,
-    /** The UTF-16-BE encoding with BOM. */
-    YAML_UTF16BE_ENCODING
-} yaml_encoding_t;
-
-/** Line break types. */
-
-typedef enum yaml_break_e {
-    /** Let the parser choose the break type. */
-    YAML_ANY_BREAK,
-    /** Use CR for line breaks (Mac style). */
-    YAML_CR_BREAK,
-    /** Use LN for line breaks (Unix style). */
-    YAML_LN_BREAK,
-    /** Use CR LN for line breaks (DOS style). */
-    YAML_CRLN_BREAK
-} yaml_break_t;
-
-/** Many bad things could happen with the parser and emitter. */
-typedef enum yaml_error_type_e {
-    /** No error is produced. */
-    YAML_NO_ERROR,
-
-    /** Cannot allocate or reallocate a block of memory. */
-    YAML_MEMORY_ERROR,
-
-    /** Cannot read or decode the input stream. */
-    YAML_READER_ERROR,
-    /** Cannot scan the input stream. */
-    YAML_SCANNER_ERROR,
-    /** Cannot parse the input stream. */
-    YAML_PARSER_ERROR,
-    /** Cannot compose a YAML document. */
-    YAML_COMPOSER_ERROR,
-
-    /** Cannot write to the output stream. */
-    YAML_WRITER_ERROR,
-    /** Cannot emit a YAML stream. */
-    YAML_EMITTER_ERROR
-} yaml_error_type_t;
-
-/** The pointer position. */
-typedef struct yaml_mark_s {
-    /** The position index. */
-    size_t index;
-
-    /** The position line. */
-    size_t line;
-
-    /** The position column. */
-    size_t column;
-} yaml_mark_t;
-
-/** @} */
-
-/**
- * @defgroup styles Node Styles
- * @{
- */
-
-/** Scalar styles. */
-typedef enum yaml_scalar_style_e {
-    /** Let the emitter choose the style. */
-    YAML_ANY_SCALAR_STYLE,
-
-    /** The plain scalar style. */
-    YAML_PLAIN_SCALAR_STYLE,
-
-    /** The single-quoted scalar style. */
-    YAML_SINGLE_QUOTED_SCALAR_STYLE,
-    /** The double-quoted scalar style. */
-    YAML_DOUBLE_QUOTED_SCALAR_STYLE,
-
-    /** The literal scalar style. */
-    YAML_LITERAL_SCALAR_STYLE,
-    /** The folded scalar style. */
-    YAML_FOLDED_SCALAR_STYLE
-} yaml_scalar_style_t;
-
-/** Sequence styles. */
-typedef enum yaml_sequence_style_e {
-    /** Let the emitter choose the style. */
-    YAML_ANY_SEQUENCE_STYLE,
-
-    /** The block sequence style. */
-    YAML_BLOCK_SEQUENCE_STYLE,
-    /** The flow sequence style. */
-    YAML_FLOW_SEQUENCE_STYLE
-} yaml_sequence_style_t;
-
-/** Mapping styles. */
-typedef enum yaml_mapping_style_e {
-    /** Let the emitter choose the style. */
-    YAML_ANY_MAPPING_STYLE,
-
-    /** The block mapping style. */
-    YAML_BLOCK_MAPPING_STYLE,
-    /** The flow mapping style. */
-    YAML_FLOW_MAPPING_STYLE
-/*    YAML_FLOW_SET_MAPPING_STYLE   */
-} yaml_mapping_style_t;
-
-/** @} */
-
-/**
- * @defgroup tokens Tokens
- * @{
- */
-
-/** Token types. */
-typedef enum yaml_token_type_e {
-    /** An empty token. */
-    YAML_NO_TOKEN,
-
-    /** A STREAM-START token. */
-    YAML_STREAM_START_TOKEN,
-    /** A STREAM-END token. */
-    YAML_STREAM_END_TOKEN,
-
-    /** A VERSION-DIRECTIVE token. */
-    YAML_VERSION_DIRECTIVE_TOKEN,
-    /** A TAG-DIRECTIVE token. */
-    YAML_TAG_DIRECTIVE_TOKEN,
-    /** A DOCUMENT-START token. */
-    YAML_DOCUMENT_START_TOKEN,
-    /** A DOCUMENT-END token. */
-    YAML_DOCUMENT_END_TOKEN,
-
-    /** A BLOCK-SEQUENCE-START token. */
-    YAML_BLOCK_SEQUENCE_START_TOKEN,
-    /** A BLOCK-SEQUENCE-END token. */
-    YAML_BLOCK_MAPPING_START_TOKEN,
-    /** A BLOCK-END token. */
-    YAML_BLOCK_END_TOKEN,
-
-    /** A FLOW-SEQUENCE-START token. */
-    YAML_FLOW_SEQUENCE_START_TOKEN,
-    /** A FLOW-SEQUENCE-END token. */
-    YAML_FLOW_SEQUENCE_END_TOKEN,
-    /** A FLOW-MAPPING-START token. */
-    YAML_FLOW_MAPPING_START_TOKEN,
-    /** A FLOW-MAPPING-END token. */
-    YAML_FLOW_MAPPING_END_TOKEN,
-
-    /** A BLOCK-ENTRY token. */
-    YAML_BLOCK_ENTRY_TOKEN,
-    /** A FLOW-ENTRY token. */
-    YAML_FLOW_ENTRY_TOKEN,
-    /** A KEY token. */
-    YAML_KEY_TOKEN,
-    /** A VALUE token. */
-    YAML_VALUE_TOKEN,
-
-    /** An ALIAS token. */
-    YAML_ALIAS_TOKEN,
-    /** An ANCHOR token. */
-    YAML_ANCHOR_TOKEN,
-    /** A TAG token. */
-    YAML_TAG_TOKEN,
-    /** A SCALAR token. */
-    YAML_SCALAR_TOKEN
-} yaml_token_type_t;
-
-/** The token structure. */
-typedef struct yaml_token_s {
-
-    /** The token type. */
-    yaml_token_type_t type;
-
-    /** The token data. */
-    union {
-
-        /** The stream start (for @c YAML_STREAM_START_TOKEN). */
-        struct {
-            /** The stream encoding. */
-            yaml_encoding_t encoding;
-        } stream_start;
-
-        /** The alias (for @c YAML_ALIAS_TOKEN). */
-        struct {
-            /** The alias value. */
-            yaml_char_t *value;
-        } alias;
-
-        /** The anchor (for @c YAML_ANCHOR_TOKEN). */
-        struct {
-            /** The anchor value. */
-            yaml_char_t *value;
-        } anchor;
-
-        /** The tag (for @c YAML_TAG_TOKEN). */
-        struct {
-            /** The tag handle. */
-            yaml_char_t *handle;
-            /** The tag suffix. */
-            yaml_char_t *suffix;
-        } tag;
-
-        /** The scalar value (for @c YAML_SCALAR_TOKEN). */
-        struct {
-            /** The scalar value. */
-            yaml_char_t *value;
-            /** The length of the scalar value. */
-            size_t length;
-            /** The scalar style. */
-            yaml_scalar_style_t style;
-        } scalar;
-
-        /** The version directive (for @c YAML_VERSION_DIRECTIVE_TOKEN). */
-        struct {
-            /** The major version number. */
-            int major;
-            /** The minor version number. */
-            int minor;
-        } version_directive;
-
-        /** The tag directive (for @c YAML_TAG_DIRECTIVE_TOKEN). */
-        struct {
-            /** The tag handle. */
-            yaml_char_t *handle;
-            /** The tag prefix. */
-            yaml_char_t *prefix;
-        } tag_directive;
-
-    } data;
-
-    /** The beginning of the token. */
-    yaml_mark_t start_mark;
-    /** The end of the token. */
-    yaml_mark_t end_mark;
-
-} yaml_token_t;
-
-/**
- * Free any memory allocated for a token object.
- *
- * @param[in,out]   token   A token object.
- */
-
-YAML_DECLARE(void)
-yaml_token_delete(yaml_token_t *token);
-
-/** @} */
-
-/**
- * @defgroup events Events
- * @{
- */
-
-/** Event types. */
-typedef enum yaml_event_type_e {
-    /** An empty event. */
-    YAML_NO_EVENT,
-
-    /** A STREAM-START event. */
-    YAML_STREAM_START_EVENT,
-    /** A STREAM-END event. */
-    YAML_STREAM_END_EVENT,
-
-    /** A DOCUMENT-START event. */
-    YAML_DOCUMENT_START_EVENT,
-    /** A DOCUMENT-END event. */
-    YAML_DOCUMENT_END_EVENT,
-
-    /** An ALIAS event. */
-    YAML_ALIAS_EVENT,
-    /** A SCALAR event. */
-    YAML_SCALAR_EVENT,
-
-    /** A SEQUENCE-START event. */
-    YAML_SEQUENCE_START_EVENT,
-    /** A SEQUENCE-END event. */
-    YAML_SEQUENCE_END_EVENT,
-
-    /** A MAPPING-START event. */
-    YAML_MAPPING_START_EVENT,
-    /** A MAPPING-END event. */
-    YAML_MAPPING_END_EVENT
-} yaml_event_type_t;
-
-/** The event structure. */
-typedef struct yaml_event_s {
-
-    /** The event type. */
-    yaml_event_type_t type;
-
-    /** The event data. */
-    union {
-        
-        /** The stream parameters (for @c YAML_STREAM_START_EVENT). */
-        struct {
-            /** The document encoding. */
-            yaml_encoding_t encoding;
-        } stream_start;
-
-        /** The document parameters (for @c YAML_DOCUMENT_START_EVENT). */
-        struct {
-            /** The version directive. */
-            yaml_version_directive_t *version_directive;
-
-            /** The list of tag directives. */
-            struct {
-                /** The beginning of the tag directives list. */
-                yaml_tag_directive_t *start;
-                /** The end of the tag directives list. */
-                yaml_tag_directive_t *end;
-            } tag_directives;
-
-            /** Is the document indicator implicit? */
-            int implicit;
-        } document_start;
-
-        /** The document end parameters (for @c YAML_DOCUMENT_END_EVENT). */
-        struct {
-            /** Is the document end indicator implicit? */
-            int implicit;
-        } document_end;
-
-        /** The alias parameters (for @c YAML_ALIAS_EVENT). */
-        struct {
-            /** The anchor. */
-            yaml_char_t *anchor;
-        } alias;
-
-        /** The scalar parameters (for @c YAML_SCALAR_EVENT). */
-        struct {
-            /** The anchor. */
-            yaml_char_t *anchor;
-            /** The tag. */
-            yaml_char_t *tag;
-            /** The scalar value. */
-            yaml_char_t *value;
-            /** The length of the scalar value. */
-            size_t length;
-            /** Is the tag optional for the plain style? */
-            int plain_implicit;
-            /** Is the tag optional for any non-plain style? */
-            int quoted_implicit;
-            /** The scalar style. */
-            yaml_scalar_style_t style;
-        } scalar;
-
-        /** The sequence parameters (for @c YAML_SEQUENCE_START_EVENT). */
-        struct {
-            /** The anchor. */
-            yaml_char_t *anchor;
-            /** The tag. */
-            yaml_char_t *tag;
-            /** Is the tag optional? */
-            int implicit;
-            /** The sequence style. */
-            yaml_sequence_style_t style;
-        } sequence_start;
-
-        /** The mapping parameters (for @c YAML_MAPPING_START_EVENT). */
-        struct {
-            /** The anchor. */
-            yaml_char_t *anchor;
-            /** The tag. */
-            yaml_char_t *tag;
-            /** Is the tag optional? */
-            int implicit;
-            /** The mapping style. */
-            yaml_mapping_style_t style;
-        } mapping_start;
-
-    } data;
-
-    /** The beginning of the event. */
-    yaml_mark_t start_mark;
-    /** The end of the event. */
-    yaml_mark_t end_mark;
-
-} yaml_event_t;
-
-/**
- * Create the STREAM-START event.
- *
- * @param[out]      event       An empty event object.
- * @param[in]       encoding    The stream encoding.
- *
- * @returns @c 1 if the function succeeded, @c 0 on error.
- */
-
-YAML_DECLARE(int)
-yaml_stream_start_event_initialize(yaml_event_t *event,
-        yaml_encoding_t encoding);
-
-/**
- * Create the STREAM-END event.
- *
- * @param[out]      event       An empty event object.
- *
- * @returns @c 1 if the function succeeded, @c 0 on error.
- */
-
-YAML_DECLARE(int)
-yaml_stream_end_event_initialize(yaml_event_t *event);
-
-/**
- * Create the DOCUMENT-START event.
- *
- * The @a implicit argument is considered as a stylistic parameter and may be
- * ignored by the emitter.
- *
- * @param[out]      event                   An empty event object.
- * @param[in]       version_directive       The %YAML directive value or
- *                                          @c NULL.
- * @param[in]       tag_directives_start    The beginning of the %TAG
- *                                          directives list.
- * @param[in]       tag_directives_end      The end of the %TAG directives
- *                                          list.
- * @param[in]       implicit                If the document start indicator is
- *                                          implicit.
- *
- * @returns @c 1 if the function succeeded, @c 0 on error.
- */
-
-YAML_DECLARE(int)
-yaml_document_start_event_initialize(yaml_event_t *event,
-        yaml_version_directive_t *version_directive,
-        yaml_tag_directive_t *tag_directives_start,
-        yaml_tag_directive_t *tag_directives_end,
-        int implicit);
-
-/**
- * Create the DOCUMENT-END event.
- *
- * The @a implicit argument is considered as a stylistic parameter and may be
- * ignored by the emitter.
- *
- * @param[out]      event       An empty event object.
- * @param[in]       implicit    If the document end indicator is implicit.
- *
- * @returns @c 1 if the function succeeded, @c 0 on error.
- */
-
-YAML_DECLARE(int)
-yaml_document_end_event_initialize(yaml_event_t *event, int implicit);
-
-/**
- * Create an ALIAS event.
- *
- * @param[out]      event       An empty event object.
- * @param[in]       anchor      The anchor value.
- *
- * @returns @c 1 if the function succeeded, @c 0 on error.
- */
-
-YAML_DECLARE(int)
-yaml_alias_event_initialize(yaml_event_t *event, yaml_char_t *anchor);
-
-/**
- * Create a SCALAR event.
- *
- * The @a style argument may be ignored by the emitter.
- *
- * Either the @a tag attribute or one of the @a plain_implicit and
- * @a quoted_implicit flags must be set.
- *
- * @param[out]      event           An empty event object.
- * @param[in]       anchor          The scalar anchor or @c NULL.
- * @param[in]       tag             The scalar tag or @c NULL.
- * @param[in]       value           The scalar value.
- * @param[in]       length          The length of the scalar value.
- * @param[in]       plain_implicit  If the tag may be omitted for the plain
- *                                  style.
- * @param[in]       quoted_implicit If the tag may be omitted for any
- *                                  non-plain style.
- * @param[in]       style           The scalar style.
- *
- * @returns @c 1 if the function succeeded, @c 0 on error.
- */
-
-YAML_DECLARE(int)
-yaml_scalar_event_initialize(yaml_event_t *event,
-        yaml_char_t *anchor, yaml_char_t *tag,
-        yaml_char_t *value, int length,
-        int plain_implicit, int quoted_implicit,
-        yaml_scalar_style_t style);
-
-/**
- * Create a SEQUENCE-START event.
- *
- * The @a style argument may be ignored by the emitter.
- *
- * Either the @a tag attribute or the @a implicit flag must be set.
- *
- * @param[out]      event       An empty event object.
- * @param[in]       anchor      The sequence anchor or @c NULL.
- * @param[in]       tag         The sequence tag or @c NULL.
- * @param[in]       implicit    If the tag may be omitted.
- * @param[in]       style       The sequence style.
- *
- * @returns @c 1 if the function succeeded, @c 0 on error.
- */
-
-YAML_DECLARE(int)
-yaml_sequence_start_event_initialize(yaml_event_t *event,
-        yaml_char_t *anchor, yaml_char_t *tag, int implicit,
-        yaml_sequence_style_t style);
-
-/**
- * Create a SEQUENCE-END event.
- *
- * @param[out]      event       An empty event object.
- *
- * @returns @c 1 if the function succeeded, @c 0 on error.
- */
-
-YAML_DECLARE(int)
-yaml_sequence_end_event_initialize(yaml_event_t *event);
-
-/**
- * Create a MAPPING-START event.
- *
- * The @a style argument may be ignored by the emitter.
- *
- * Either the @a tag attribute or the @a implicit flag must be set.
- *
- * @param[out]      event       An empty event object.
- * @param[in]       anchor      The mapping anchor or @c NULL.
- * @param[in]       tag         The mapping tag or @c NULL.
- * @param[in]       implicit    If the tag may be omitted.
- * @param[in]       style       The mapping style.
- *
- * @returns @c 1 if the function succeeded, @c 0 on error.
- */
-
-YAML_DECLARE(int)
-yaml_mapping_start_event_initialize(yaml_event_t *event,
-        yaml_char_t *anchor, yaml_char_t *tag, int implicit,
-        yaml_mapping_style_t style);
-
-/**
- * Create a MAPPING-END event.
- *
- * @param[out]      event       An empty event object.
- *
- * @returns @c 1 if the function succeeded, @c 0 on error.
- */
-
-YAML_DECLARE(int)
-yaml_mapping_end_event_initialize(yaml_event_t *event);
-
-/**
- * Free any memory allocated for an event object.
- *
- * @param[in,out]   event   An event object.
- */
-
-YAML_DECLARE(void)
-yaml_event_delete(yaml_event_t *event);
-
-/** @} */
-
-/**
- * @defgroup nodes Nodes
- * @{
- */
-
-/** The tag @c !!null with the only possible value: @c null. */
-#define YAML_NULL_TAG       "tag:yaml.org,2002:null"
-/** The tag @c !!bool with the values: @c true and @c falce. */
-#define YAML_BOOL_TAG       "tag:yaml.org,2002:bool"
-/** The tag @c !!str for string values. */
-#define YAML_STR_TAG        "tag:yaml.org,2002:str"
-/** The tag @c !!int for integer values. */
-#define YAML_INT_TAG        "tag:yaml.org,2002:int"
-/** The tag @c !!float for float values. */
-#define YAML_FLOAT_TAG      "tag:yaml.org,2002:float"
-/** The tag @c !!timestamp for date and time values. */
-#define YAML_TIMESTAMP_TAG  "tag:yaml.org,2002:timestamp"
-
-/** The tag @c !!seq is used to denote sequences. */
-#define YAML_SEQ_TAG        "tag:yaml.org,2002:seq"
-/** The tag @c !!map is used to denote mapping. */
-#define YAML_MAP_TAG        "tag:yaml.org,2002:map"
-
-/** The default scalar tag is @c !!str. */
-#define YAML_DEFAULT_SCALAR_TAG     YAML_STR_TAG
-/** The default sequence tag is @c !!seq. */
-#define YAML_DEFAULT_SEQUENCE_TAG   YAML_SEQ_TAG
-/** The default mapping tag is @c !!map. */
-#define YAML_DEFAULT_MAPPING_TAG    YAML_MAP_TAG
-
-/** Node types. */
-typedef enum yaml_node_type_e {
-    /** An empty node. */
-    YAML_NO_NODE,
-
-    /** A scalar node. */
-    YAML_SCALAR_NODE,
-    /** A sequence node. */
-    YAML_SEQUENCE_NODE,
-    /** A mapping node. */
-    YAML_MAPPING_NODE
-} yaml_node_type_t;
-
-/** The forward definition of a document node structure. */
-typedef struct yaml_node_s yaml_node_t;
-
-/** An element of a sequence node. */
-typedef int yaml_node_item_t;
-
-/** An element of a mapping node. */
-typedef struct yaml_node_pair_s {
-    /** The key of the element. */
-    int key;
-    /** The value of the element. */
-    int value;
-} yaml_node_pair_t;
-
-/** The node structure. */
-struct yaml_node_s {
-
-    /** The node type. */
-    yaml_node_type_t type;
-
-    /** The node tag. */
-    yaml_char_t *tag;
-
-    /** The node data. */
-    union {
-        
-        /** The scalar parameters (for @c YAML_SCALAR_NODE). */
-        struct {
-            /** The scalar value. */
-            yaml_char_t *value;
-            /** The length of the scalar value. */
-            size_t length;
-            /** The scalar style. */
-            yaml_scalar_style_t style;
-        } scalar;
-
-        /** The sequence parameters (for @c YAML_SEQUENCE_NODE). */
-        struct {
-            /** The stack of sequence items. */
-            struct {
-                /** The beginning of the stack. */
-                yaml_node_item_t *start;
-                /** The end of the stack. */
-                yaml_node_item_t *end;
-                /** The top of the stack. */
-                yaml_node_item_t *top;
-            } items;
-            /** The sequence style. */
-            yaml_sequence_style_t style;
-        } sequence;
-
-        /** The mapping parameters (for @c YAML_MAPPING_NODE). */
-        struct {
-            /** The stack of mapping pairs (key, value). */
-            struct {
-                /** The beginning of the stack. */
-                yaml_node_pair_t *start;
-                /** The end of the stack. */
-                yaml_node_pair_t *end;
-                /** The top of the stack. */
-                yaml_node_pair_t *top;
-            } pairs;
-            /** The mapping style. */
-            yaml_mapping_style_t style;
-        } mapping;
-
-    } data;
-
-    /** The beginning of the node. */
-    yaml_mark_t start_mark;
-    /** The end of the node. */
-    yaml_mark_t end_mark;
-
-};
-
-/** The document structure. */
-typedef struct yaml_document_s {
-
-    /** The document nodes. */
-    struct {
-        /** The beginning of the stack. */
-        yaml_node_t *start;
-        /** The end of the stack. */
-        yaml_node_t *end;
-        /** The top of the stack. */
-        yaml_node_t *top;
-    } nodes;
-
-    /** The version directive. */
-    yaml_version_directive_t *version_directive;
-
-    /** The list of tag directives. */
-    struct {
-        /** The beginning of the tag directives list. */
-        yaml_tag_directive_t *start;
-        /** The end of the tag directives list. */
-        yaml_tag_directive_t *end;
-    } tag_directives;
-
-    /** Is the document start indicator implicit? */
-    int start_implicit;
-    /** Is the document end indicator implicit? */
-    int end_implicit;
-
-    /** The beginning of the document. */
-    yaml_mark_t start_mark;
-    /** The end of the document. */
-    yaml_mark_t end_mark;
-
-} yaml_document_t;
-
-/**
- * Create a YAML document.
- *
- * @param[out]      document                An empty document object.
- * @param[in]       version_directive       The %YAML directive value or
- *                                          @c NULL.
- * @param[in]       tag_directives_start    The beginning of the %TAG
- *                                          directives list.
- * @param[in]       tag_directives_end      The end of the %TAG directives
- *                                          list.
- * @param[in]       start_implicit          If the document start indicator is
- *                                          implicit.
- * @param[in]       end_implicit            If the document end indicator is
- *                                          implicit.
- *
- * @returns @c 1 if the function succeeded, @c 0 on error.
- */
-
-YAML_DECLARE(int)
-yaml_document_initialize(yaml_document_t *document,
-        yaml_version_directive_t *version_directive,
-        yaml_tag_directive_t *tag_directives_start,
-        yaml_tag_directive_t *tag_directives_end,
-        int start_implicit, int end_implicit);
-
-/**
- * Delete a YAML document and all its nodes.
- *
- * @param[in,out]   document        A document object.
- */
-
-YAML_DECLARE(void)
-yaml_document_delete(yaml_document_t *document);
-
-/**
- * Get a node of a YAML document.
- *
- * The pointer returned by this function is valid until any of the functions
- * modifying the documents are called.
- *
- * @param[in]       document        A document object.
- * @param[in]       index           The node id.
- *
- * @returns the node objct or @c NULL if @c node_id is out of range.
- */
-
-YAML_DECLARE(yaml_node_t *)
-yaml_document_get_node(yaml_document_t *document, int index);
-
-/**
- * Get the root of a YAML document node.
- *
- * The root object is the first object added to the document.
- *
- * The pointer returned by this function is valid until any of the functions
- * modifying the documents are called.
- *
- * An empty document produced by the parser signifies the end of a YAML
- * stream.
- *
- * @param[in]       document        A document object.
- *
- * @returns the node object or @c NULL if the document is empty.
- */
-
-YAML_DECLARE(yaml_node_t *)
-yaml_document_get_root_node(yaml_document_t *document);
-
-/**
- * Create a SCALAR node and attach it to the document.
- *
- * The @a style argument may be ignored by the emitter.
- *
- * @param[in,out]   document        A document object.
- * @param[in]       tag             The scalar tag.
- * @param[in]       value           The scalar value.
- * @param[in]       length          The length of the scalar value.
- * @param[in]       style           The scalar style.
- *
- * @returns the node id or @c 0 on error.
- */
-
-YAML_DECLARE(int)
-yaml_document_add_scalar(yaml_document_t *document,
-        yaml_char_t *tag, yaml_char_t *value, int length,
-        yaml_scalar_style_t style);
-
-/**
- * Create a SEQUENCE node and attach it to the document.
- *
- * The @a style argument may be ignored by the emitter.
- *
- * @param[in,out]   document    A document object.
- * @param[in]       tag         The sequence tag.
- * @param[in]       style       The sequence style.
- *
- * @returns the node id or @c 0 on error.
- */
-
-YAML_DECLARE(int)
-yaml_document_add_sequence(yaml_document_t *document,
-        yaml_char_t *tag, yaml_sequence_style_t style);
-
-/**
- * Create a MAPPING node and attach it to the document.
- *
- * The @a style argument may be ignored by the emitter.
- *
- * @param[in,out]   document    A document object.
- * @param[in]       tag         The sequence tag.
- * @param[in]       style       The sequence style.
- *
- * @returns the node id or @c 0 on error.
- */
-
-YAML_DECLARE(int)
-yaml_document_add_mapping(yaml_document_t *document,
-        yaml_char_t *tag, yaml_mapping_style_t style);
-
-/**
- * Add an item to a SEQUENCE node.
- *
- * @param[in,out]   document    A document object.
- * @param[in]       sequence    The sequence node id.
- * @param[in]       item        The item node id.
-*
- * @returns @c 1 if the function succeeded, @c 0 on error.
- */
-
-YAML_DECLARE(int)
-yaml_document_append_sequence_item(yaml_document_t *document,
-        int sequence, int item);
-
-/**
- * Add a pair of a key and a value to a MAPPING node.
- *
- * @param[in,out]   document    A document object.
- * @param[in]       mapping     The mapping node id.
- * @param[in]       key         The key node id.
- * @param[in]       value       The value node id.
-*
- * @returns @c 1 if the function succeeded, @c 0 on error.
- */
-
-YAML_DECLARE(int)
-yaml_document_append_mapping_pair(yaml_document_t *document,
-        int mapping, int key, int value);
-
-/** @} */
-
-/**
- * @defgroup parser Parser Definitions
- * @{
- */
-
-/**
- * The prototype of a read handler.
- *
- * The read handler is called when the parser needs to read more bytes from the
- * source.  The handler should write not more than @a size bytes to the @a
- * buffer.  The number of written bytes should be set to the @a length variable.
- *
- * @param[in,out]   data        A pointer to an application data specified by
- *                              yaml_parser_set_input().
- * @param[out]      buffer      The buffer to write the data from the source.
- * @param[in]       size        The size of the buffer.
- * @param[out]      size_read   The actual number of bytes read from the source.
- *
- * @returns On success, the handler should return @c 1.  If the handler failed,
- * the returned value should be @c 0.  On EOF, the handler should set the
- * @a size_read to @c 0 and return @c 1.
- */
-
-typedef int yaml_read_handler_t(void *data, unsigned char *buffer, size_t size,
-        size_t *size_read);
-
-/**
- * This structure holds information about a potential simple key.
- */
-
-typedef struct yaml_simple_key_s {
-    /** Is a simple key possible? */
-    int possible;
-
-    /** Is a simple key required? */
-    int required;
-
-    /** The number of the token. */
-    size_t token_number;
-
-    /** The position mark. */
-    yaml_mark_t mark;
-} yaml_simple_key_t;
-
-/**
- * The states of the parser.
- */
-typedef enum yaml_parser_state_e {
-    /** Expect STREAM-START. */
-    YAML_PARSE_STREAM_START_STATE,
-    /** Expect the beginning of an implicit document. */
-    YAML_PARSE_IMPLICIT_DOCUMENT_START_STATE,
-    /** Expect DOCUMENT-START. */
-    YAML_PARSE_DOCUMENT_START_STATE,
-    /** Expect the content of a document. */
-    YAML_PARSE_DOCUMENT_CONTENT_STATE,
-    /** Expect DOCUMENT-END. */
-    YAML_PARSE_DOCUMENT_END_STATE,
-    /** Expect a block node. */
-    YAML_PARSE_BLOCK_NODE_STATE,
-    /** Expect a block node or indentless sequence. */
-    YAML_PARSE_BLOCK_NODE_OR_INDENTLESS_SEQUENCE_STATE,
-    /** Expect a flow node. */
-    YAML_PARSE_FLOW_NODE_STATE,
-    /** Expect the first entry of a block sequence. */
-    YAML_PARSE_BLOCK_SEQUENCE_FIRST_ENTRY_STATE,
-    /** Expect an entry of a block sequence. */
-    YAML_PARSE_BLOCK_SEQUENCE_ENTRY_STATE,
-    /** Expect an entry of an indentless sequence. */
-    YAML_PARSE_INDENTLESS_SEQUENCE_ENTRY_STATE,
-    /** Expect the first key of a block mapping. */
-    YAML_PARSE_BLOCK_MAPPING_FIRST_KEY_STATE,
-    /** Expect a block mapping key. */
-    YAML_PARSE_BLOCK_MAPPING_KEY_STATE,
-    /** Expect a block mapping value. */
-    YAML_PARSE_BLOCK_MAPPING_VALUE_STATE,
-    /** Expect the first entry of a flow sequence. */
-    YAML_PARSE_FLOW_SEQUENCE_FIRST_ENTRY_STATE,
-    /** Expect an entry of a flow sequence. */
-    YAML_PARSE_FLOW_SEQUENCE_ENTRY_STATE,
-    /** Expect a key of an ordered mapping. */
-    YAML_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_KEY_STATE,
-    /** Expect a value of an ordered mapping. */
-    YAML_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_VALUE_STATE,
-    /** Expect the and of an ordered mapping entry. */
-    YAML_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_END_STATE,
-    /** Expect the first key of a flow mapping. */
-    YAML_PARSE_FLOW_MAPPING_FIRST_KEY_STATE,
-    /** Expect a key of a flow mapping. */
-    YAML_PARSE_FLOW_MAPPING_KEY_STATE,
-    /** Expect a value of a flow mapping. */
-    YAML_PARSE_FLOW_MAPPING_VALUE_STATE,
-    /** Expect an empty value of a flow mapping. */
-    YAML_PARSE_FLOW_MAPPING_EMPTY_VALUE_STATE,
-    /** Expect nothing. */
-    YAML_PARSE_END_STATE
-} yaml_parser_state_t;
-
-/**
- * This structure holds aliases data.
- */
-
-typedef struct yaml_alias_data_s {
-    /** The anchor. */
-    yaml_char_t *anchor;
-    /** The node id. */
-    int index;
-    /** The anchor mark. */
-    yaml_mark_t mark;
-} yaml_alias_data_t;
-
-/**
- * The parser structure.
- *
- * All members are internal.  Manage the structure using the @c yaml_parser_
- * family of functions.
- */
-
-typedef struct yaml_parser_s {
-
-    /**
-     * @name Error handling
-     * @{
-     */
-
-    /** Error type. */
-    yaml_error_type_t error;
-    /** Error description. */
-    const char *problem;
-    /** The byte about which the problem occured. */
-    size_t problem_offset;
-    /** The problematic value (@c -1 is none). */
-    int problem_value;
-    /** The problem position. */
-    yaml_mark_t problem_mark;
-    /** The error context. */
-    const char *context;
-    /** The context position. */
-    yaml_mark_t context_mark;
-
-    /**
-     * @}
-     */
-
-    /**
-     * @name Reader stuff
-     * @{
-     */
-
-    /** Read handler. */
-    yaml_read_handler_t *read_handler;
-
-    /** A pointer for passing to the read handler. */
-    void *read_handler_data;
-
-    /** Standard (string or file) input data. */
-    union {
-        /** String input data. */
-        struct {
-            /** The string start pointer. */
-            const unsigned char *start;
-            /** The string end pointer. */
-            const unsigned char *end;
-            /** The string current position. */
-            const unsigned char *current;
-        } string;
-
-        /** File input data. */
-        FILE *file;
-    } input;
-
-    /** EOF flag */
-    int eof;
-
-    /** The working buffer. */
-    struct {
-        /** The beginning of the buffer. */
-        yaml_char_t *start;
-        /** The end of the buffer. */
-        yaml_char_t *end;
-        /** The current position of the buffer. */
-        yaml_char_t *pointer;
-        /** The last filled position of the buffer. */
-        yaml_char_t *last;
-    } buffer;
-
-    /* The number of unread characters in the buffer. */
-    size_t unread;
-
-    /** The raw buffer. */
-    struct {
-        /** The beginning of the buffer. */
-        unsigned char *start;
-        /** The end of the buffer. */
-        unsigned char *end;
-        /** The current position of the buffer. */
-        unsigned char *pointer;
-        /** The last filled position of the buffer. */
-        unsigned char *last;
-    } raw_buffer;
-
-    /** The input encoding. */
-    yaml_encoding_t encoding;
-
-    /** The offset of the current position (in bytes). */
-    size_t offset;
-
-    /** The mark of the current position. */
-    yaml_mark_t mark;
-
-    /**
-     * @}
-     */
-
-    /**
-     * @name Scanner stuff
-     * @{
-     */
-
-    /** Have we started to scan the input stream? */
-    int stream_start_produced;
-
-    /** Have we reached the end of the input stream? */
-    int stream_end_produced;
-
-    /** The number of unclosed '[' and '{' indicators. */
-    int flow_level;
-
-    /** The tokens queue. */
-    struct {
-        /** The beginning of the tokens queue. */
-        yaml_token_t *start;
-        /** The end of the tokens queue. */
-        yaml_token_t *end;
-        /** The head of the tokens queue. */
-        yaml_token_t *head;
-        /** The tail of the tokens queue. */
-        yaml_token_t *tail;
-    } tokens;
-
-    /** The number of tokens fetched from the queue. */
-    size_t tokens_parsed;
-
-    /* Does the tokens queue contain a token ready for dequeueing. */
-    int token_available;
-
-    /** The indentation levels stack. */
-    struct {
-        /** The beginning of the stack. */
-        int *start;
-        /** The end of the stack. */
-        int *end;
-        /** The top of the stack. */
-        int *top;
-    } indents;
-
-    /** The current indentation level. */
-    int indent;
-
-    /** May a simple key occur at the current position? */
-    int simple_key_allowed;
-
-    /** The stack of simple keys. */
-    struct {
-        /** The beginning of the stack. */
-        yaml_simple_key_t *start;
-        /** The end of the stack. */
-        yaml_simple_key_t *end;
-        /** The top of the stack. */
-        yaml_simple_key_t *top;
-    } simple_keys;
-
-    /**
-     * @}
-     */
-
-    /**
-     * @name Parser stuff
-     * @{
-     */
-
-    /** The parser states stack. */
-    struct {
-        /** The beginning of the stack. */
-        yaml_parser_state_t *start;
-        /** The end of the stack. */
-        yaml_parser_state_t *end;
-        /** The top of the stack. */
-        yaml_parser_state_t *top;
-    } states;
-
-    /** The current parser state. */
-    yaml_parser_state_t state;
-
-    /** The stack of marks. */
-    struct {
-        /** The beginning of the stack. */
-        yaml_mark_t *start;
-        /** The end of the stack. */
-        yaml_mark_t *end;
-        /** The top of the stack. */
-        yaml_mark_t *top;
-    } marks;
-
-    /** The list of TAG directives. */
-    struct {
-        /** The beginning of the list. */
-        yaml_tag_directive_t *start;
-        /** The end of the list. */
-        yaml_tag_directive_t *end;
-        /** The top of the list. */
-        yaml_tag_directive_t *top;
-    } tag_directives;
-
-    /**
-     * @}
-     */
-
-    /**
-     * @name Dumper stuff
-     * @{
-     */
-
-    /** The alias data. */
-    struct {
-        /** The beginning of the list. */
-        yaml_alias_data_t *start;
-        /** The end of the list. */
-        yaml_alias_data_t *end;
-        /** The top of the list. */
-        yaml_alias_data_t *top;
-    } aliases;
-
-    /** The currently parsed document. */
-    yaml_document_t *document;
-
-    /**
-     * @}
-     */
-
-} yaml_parser_t;
-
-/**
- * Initialize a parser.
- *
- * This function creates a new parser object.  An application is responsible
- * for destroying the object using the yaml_parser_delete() function.
- *
- * @param[out]      parser  An empty parser object.
- *
- * @returns @c 1 if the function succeeded, @c 0 on error.
- */
-
-YAML_DECLARE(int)
-yaml_parser_initialize(yaml_parser_t *parser);
-
-/**
- * Destroy a parser.
- *
- * @param[in,out]   parser  A parser object.
- */
-
-YAML_DECLARE(void)
-yaml_parser_delete(yaml_parser_t *parser);
-
-/**
- * Set a string input.
- *
- * Note that the @a input pointer must be valid while the @a parser object
- * exists.  The application is responsible for destroing @a input after
- * destroying the @a parser.
- *
- * @param[in,out]   parser  A parser object.
- * @param[in]       input   A source data.
- * @param[in]       size    The length of the source data in bytes.
- */
-
-YAML_DECLARE(void)
-yaml_parser_set_input_string(yaml_parser_t *parser,
-        const unsigned char *input, size_t size);
-
-/**
- * Set a file input.
- *
- * @a file should be a file object open for reading.  The application is
- * responsible for closing the @a file.
- *
- * @param[in,out]   parser  A parser object.
- * @param[in]       file    An open file.
- */
-
-YAML_DECLARE(void)
-yaml_parser_set_input_file(yaml_parser_t *parser, FILE *file);
-
-/**
- * Set a generic input handler.
- *
- * @param[in,out]   parser  A parser object.
- * @param[in]       handler A read handler.
- * @param[in]       data    Any application data for passing to the read
- *                          handler.
- */
-
-YAML_DECLARE(void)
-yaml_parser_set_input(yaml_parser_t *parser,
-        yaml_read_handler_t *handler, void *data);
-
-/**
- * Set the source encoding.
- *
- * @param[in,out]   parser      A parser object.
- * @param[in]       encoding    The source encoding.
- */
-
-YAML_DECLARE(void)
-yaml_parser_set_encoding(yaml_parser_t *parser, yaml_encoding_t encoding);
-
-/**
- * Scan the input stream and produce the next token.
- *
- * Call the function subsequently to produce a sequence of tokens corresponding
- * to the input stream.  The initial token has the type
- * @c YAML_STREAM_START_TOKEN while the ending token has the type
- * @c YAML_STREAM_END_TOKEN.
- *
- * An application is responsible for freeing any buffers associated with the
- * produced token object using the @c yaml_token_delete function.
- *
- * An application must not alternate the calls of yaml_parser_scan() with the
- * calls of yaml_parser_parse() or yaml_parser_load(). Doing this will break
- * the parser.
- *
- * @param[in,out]   parser      A parser object.
- * @param[out]      token       An empty token object.
- *
- * @returns @c 1 if the function succeeded, @c 0 on error.
- */
-
-YAML_DECLARE(int)
-yaml_parser_scan(yaml_parser_t *parser, yaml_token_t *token);
-
-/**
- * Parse the input stream and produce the next parsing event.
- *
- * Call the function subsequently to produce a sequence of events corresponding
- * to the input stream.  The initial event has the type
- * @c YAML_STREAM_START_EVENT while the ending event has the type
- * @c YAML_STREAM_END_EVENT.
- *
- * An application is responsible for freeing any buffers associated with the
- * produced event object using the yaml_event_delete() function.
- *
- * An application must not alternate the calls of yaml_parser_parse() with the
- * calls of yaml_parser_scan() or yaml_parser_load(). Doing this will break the
- * parser.
- *
- * @param[in,out]   parser      A parser object.
- * @param[out]      event       An empty event object.
- *
- * @returns @c 1 if the function succeeded, @c 0 on error.
- */
-
-YAML_DECLARE(int)
-yaml_parser_parse(yaml_parser_t *parser, yaml_event_t *event);
-
-/**
- * Parse the input stream and produce the next YAML document.
- *
- * Call this function subsequently to produce a sequence of documents
- * constituting the input stream.
- *
- * If the produced document has no root node, it means that the document
- * end has been reached.
- *
- * An application is responsible for freeing any data associated with the
- * produced document object using the yaml_document_delete() function.
- *
- * An application must not alternate the calls of yaml_parser_load() with the
- * calls of yaml_parser_scan() or yaml_parser_parse(). Doing this will break
- * the parser.
- *
- * @param[in,out]   parser      A parser object.
- * @param[out]      document    An empty document object.
- *
- * @return @c 1 if the function succeeded, @c 0 on error.
- */
-
-YAML_DECLARE(int)
-yaml_parser_load(yaml_parser_t *parser, yaml_document_t *document);
-
-/** @} */
-
-/**
- * @defgroup emitter Emitter Definitions
- * @{
- */
-
-/**
- * The prototype of a write handler.
- *
- * The write handler is called when the emitter needs to flush the accumulated
- * characters to the output.  The handler should write @a size bytes of the
- * @a buffer to the output.
- *
- * @param[in,out]   data        A pointer to an application data specified by
- *                              yaml_emitter_set_output().
- * @param[in]       buffer      The buffer with bytes to be written.
- * @param[in]       size        The size of the buffer.
- *
- * @returns On success, the handler should return @c 1.  If the handler failed,
- * the returned value should be @c 0.
- */
-
-typedef int yaml_write_handler_t(void *data, unsigned char *buffer, size_t size);
-
-/** The emitter states. */
-typedef enum yaml_emitter_state_e {
-    /** Expect STREAM-START. */
-    YAML_EMIT_STREAM_START_STATE,
-    /** Expect the first DOCUMENT-START or STREAM-END. */
-    YAML_EMIT_FIRST_DOCUMENT_START_STATE,
-    /** Expect DOCUMENT-START or STREAM-END. */
-    YAML_EMIT_DOCUMENT_START_STATE,
-    /** Expect the content of a document. */
-    YAML_EMIT_DOCUMENT_CONTENT_STATE,
-    /** Expect DOCUMENT-END. */
-    YAML_EMIT_DOCUMENT_END_STATE,
-    /** Expect the first item of a flow sequence. */
-    YAML_EMIT_FLOW_SEQUENCE_FIRST_ITEM_STATE,
-    /** Expect an item of a flow sequence. */
-    YAML_EMIT_FLOW_SEQUENCE_ITEM_STATE,
-    /** Expect the first key of a flow mapping. */
-    YAML_EMIT_FLOW_MAPPING_FIRST_KEY_STATE,
-    /** Expect a key of a flow mapping. */
-    YAML_EMIT_FLOW_MAPPING_KEY_STATE,
-    /** Expect a value for a simple key of a flow mapping. */
-    YAML_EMIT_FLOW_MAPPING_SIMPLE_VALUE_STATE,
-    /** Expect a value of a flow mapping. */
-    YAML_EMIT_FLOW_MAPPING_VALUE_STATE,
-    /** Expect the first item of a block sequence. */
-    YAML_EMIT_BLOCK_SEQUENCE_FIRST_ITEM_STATE,
-    /** Expect an item of a block sequence. */
-    YAML_EMIT_BLOCK_SEQUENCE_ITEM_STATE,
-    /** Expect the first key of a block mapping. */
-    YAML_EMIT_BLOCK_MAPPING_FIRST_KEY_STATE,
-    /** Expect the key of a block mapping. */
-    YAML_EMIT_BLOCK_MAPPING_KEY_STATE,
-    /** Expect a value for a simple key of a block mapping. */
-    YAML_EMIT_BLOCK_MAPPING_SIMPLE_VALUE_STATE,
-    /** Expect a value of a block mapping. */
-    YAML_EMIT_BLOCK_MAPPING_VALUE_STATE,
-    /** Expect nothing. */
-    YAML_EMIT_END_STATE
-} yaml_emitter_state_t;
-
-/**
- * The emitter structure.
- *
- * All members are internal.  Manage the structure using the @c yaml_emitter_
- * family of functions.
- */
-
-typedef struct yaml_emitter_s {
-
-    /**
-     * @name Error handling
-     * @{
-     */
-
-    /** Error type. */
-    yaml_error_type_t error;
-    /** Error description. */
-    const char *problem;
-
-    /**
-     * @}
-     */
-
-    /**
-     * @name Writer stuff
-     * @{
-     */
-
-    /** Write handler. */
-    yaml_write_handler_t *write_handler;
-
-    /** A pointer for passing to the white handler. */
-    void *write_handler_data;
-
-    /** Standard (string or file) output data. */
-    union {
-        /** String output data. */
-        struct {
-            /** The buffer pointer. */
-            unsigned char *buffer;
-            /** The buffer size. */
-            size_t size;
-            /** The number of written bytes. */
-            size_t *size_written;
-        } string;
-
-        /** File output data. */
-        FILE *file;
-    } output;
-
-    /** The working buffer. */
-    struct {
-        /** The beginning of the buffer. */
-        yaml_char_t *start;
-        /** The end of the buffer. */
-        yaml_char_t *end;
-        /** The current position of the buffer. */
-        yaml_char_t *pointer;
-        /** The last filled position of the buffer. */
-        yaml_char_t *last;
-    } buffer;
-
-    /** The raw buffer. */
-    struct {
-        /** The beginning of the buffer. */
-        unsigned char *start;
-        /** The end of the buffer. */
-        unsigned char *end;
-        /** The current position of the buffer. */
-        unsigned char *pointer;
-        /** The last filled position of the buffer. */
-        unsigned char *last;
-    } raw_buffer;
-
-    /** The stream encoding. */
-    yaml_encoding_t encoding;
-
-    /**
-     * @}
-     */
-
-    /**
-     * @name Emitter stuff
-     * @{
-     */
-
-    /** If the output is in the canonical style? */
-    int canonical;
-    /** The number of indentation spaces. */
-    int best_indent;
-    /** The preferred width of the output lines. */
-    int best_width;
-    /** Allow unescaped non-ASCII characters? */
-    int unicode;
-    /** The preferred line break. */
-    yaml_break_t line_break;
-
-    /** The stack of states. */
-    struct {
-        /** The beginning of the stack. */
-        yaml_emitter_state_t *start;
-        /** The end of the stack. */
-        yaml_emitter_state_t *end;
-        /** The top of the stack. */
-        yaml_emitter_state_t *top;
-    } states;
-
-    /** The current emitter state. */
-    yaml_emitter_state_t state;
-
-    /** The event queue. */
-    struct {
-        /** The beginning of the event queue. */
-        yaml_event_t *start;
-        /** The end of the event queue. */
-        yaml_event_t *end;
-        /** The head of the event queue. */
-        yaml_event_t *head;
-        /** The tail of the event queue. */
-        yaml_event_t *tail;
-    } events;
-
-    /** The stack of indentation levels. */
-    struct {
-        /** The beginning of the stack. */
-        int *start;
-        /** The end of the stack. */
-        int *end;
-        /** The top of the stack. */
-        int *top;
-    } indents;
-
-    /** The list of tag directives. */
-    struct {
-        /** The beginning of the list. */
-        yaml_tag_directive_t *start;
-        /** The end of the list. */
-        yaml_tag_directive_t *end;
-        /** The top of the list. */
-        yaml_tag_directive_t *top;
-    } tag_directives;
-
-    /** The current indentation level. */
-    int indent;
-
-    /** The current flow level. */
-    int flow_level;
-
-    /** Is it the document root context? */
-    int root_context;
-    /** Is it a sequence context? */
-    int sequence_context;
-    /** Is it a mapping context? */
-    int mapping_context;
-    /** Is it a simple mapping key context? */
-    int simple_key_context;
-
-    /** The current line. */
-    int line;
-    /** The current column. */
-    int column;
-    /** If the last character was a whitespace? */
-    int whitespace;
-    /** If the last character was an indentation character (' ', '-', '?', ':')? */
-    int indention;
-    /** If an explicit document end is required? */
-    int open_ended;
-
-    /** Anchor analysis. */
-    struct {
-        /** The anchor value. */
-        yaml_char_t *anchor;
-        /** The anchor length. */
-        size_t anchor_length;
-        /** Is it an alias? */
-        int alias;
-    } anchor_data;
-
-    /** Tag analysis. */
-    struct {
-        /** The tag handle. */
-        yaml_char_t *handle;
-        /** The tag handle length. */
-        size_t handle_length;
-        /** The tag suffix. */
-        yaml_char_t *suffix;
-        /** The tag suffix length. */
-        size_t suffix_length;
-    } tag_data;
-
-    /** Scalar analysis. */
-    struct {
-        /** The scalar value. */
-        yaml_char_t *value;
-        /** The scalar length. */
-        size_t length;
-        /** Does the scalar contain line breaks? */
-        int multiline;
-        /** Can the scalar be expessed in the flow plain style? */
-        int flow_plain_allowed;
-        /** Can the scalar be expressed in the block plain style? */
-        int block_plain_allowed;
-        /** Can the scalar be expressed in the single quoted style? */
-        int single_quoted_allowed;
-        /** Can the scalar be expressed in the literal or folded styles? */
-        int block_allowed;
-        /** The output style. */
-        yaml_scalar_style_t style;
-    } scalar_data;
-
-    /**
-     * @}
-     */
-
-    /**
-     * @name Dumper stuff
-     * @{
-     */
-
-    /** If the stream was already opened? */
-    int opened;
-    /** If the stream was already closed? */
-    int closed;
-
-    /** The information associated with the document nodes. */
-    struct {
-        /** The number of references. */
-        int references;
-        /** The anchor id. */
-        int anchor;
-        /** If the node has been emitted? */
-        int serialized;
-    } *anchors;
-
-    /** The last assigned anchor id. */
-    int last_anchor_id;
-
-    /** The currently emitted document. */
-    yaml_document_t *document;
-
-    /**
-     * @}
-     */
-
-} yaml_emitter_t;
-
-/**
- * Initialize an emitter.
- *
- * This function creates a new emitter object.  An application is responsible
- * for destroying the object using the yaml_emitter_delete() function.
- *
- * @param[out]      emitter     An empty parser object.
- *
- * @returns @c 1 if the function succeeded, @c 0 on error.
- */
-
-YAML_DECLARE(int)
-yaml_emitter_initialize(yaml_emitter_t *emitter);
-
-/**
- * Destroy an emitter.
- *
- * @param[in,out]   emitter     An emitter object.
- */
-
-YAML_DECLARE(void)
-yaml_emitter_delete(yaml_emitter_t *emitter);
-
-/**
- * Set a string output.
- *
- * The emitter will write the output characters to the @a output buffer of the
- * size @a size.  The emitter will set @a size_written to the number of written
- * bytes.  If the buffer is smaller than required, the emitter produces the
- * YAML_WRITE_ERROR error.
- *
- * @param[in,out]   emitter         An emitter object.
- * @param[in]       output          An output buffer.
- * @param[in]       size            The buffer size.
- * @param[in]       size_written    The pointer to save the number of written
- *                                  bytes.
- */
-
-YAML_DECLARE(void)
-yaml_emitter_set_output_string(yaml_emitter_t *emitter,
-        unsigned char *output, size_t size, size_t *size_written);
-
-/**
- * Set a file output.
- *
- * @a file should be a file object open for writing.  The application is
- * responsible for closing the @a file.
- *
- * @param[in,out]   emitter     An emitter object.
- * @param[in]       file        An open file.
- */
-
-YAML_DECLARE(void)
-yaml_emitter_set_output_file(yaml_emitter_t *emitter, FILE *file);
-
-/**
- * Set a generic output handler.
- *
- * @param[in,out]   emitter     An emitter object.
- * @param[in]       handler     A write handler.
- * @param[in]       data        Any application data for passing to the write
- *                              handler.
- */
-
-YAML_DECLARE(void)
-yaml_emitter_set_output(yaml_emitter_t *emitter,
-        yaml_write_handler_t *handler, void *data);
-
-/**
- * Set the output encoding.
- *
- * @param[in,out]   emitter     An emitter object.
- * @param[in]       encoding    The output encoding.
- */
-
-YAML_DECLARE(void)
-yaml_emitter_set_encoding(yaml_emitter_t *emitter, yaml_encoding_t encoding);
-
-/**
- * Set if the output should be in the "canonical" format as in the YAML
- * specification.
- *
- * @param[in,out]   emitter     An emitter object.
- * @param[in]       canonical   If the output is canonical.
- */
-
-YAML_DECLARE(void)
-yaml_emitter_set_canonical(yaml_emitter_t *emitter, int canonical);
-
-/**
- * Set the intendation increment.
- *
- * @param[in,out]   emitter     An emitter object.
- * @param[in]       indent      The indentation increment (1 < . < 10).
- */
-
-YAML_DECLARE(void)
-yaml_emitter_set_indent(yaml_emitter_t *emitter, int indent);
-
-/**
- * Set the preferred line width. @c -1 means unlimited.
- *
- * @param[in,out]   emitter     An emitter object.
- * @param[in]       width       The preferred line width.
- */
-
-YAML_DECLARE(void)
-yaml_emitter_set_width(yaml_emitter_t *emitter, int width);
-
-/**
- * Set if unescaped non-ASCII characters are allowed.
- *
- * @param[in,out]   emitter     An emitter object.
- * @param[in]       unicode     If unescaped Unicode characters are allowed.
- */
-
-YAML_DECLARE(void)
-yaml_emitter_set_unicode(yaml_emitter_t *emitter, int unicode);
-
-/**
- * Set the preferred line break.
- *
- * @param[in,out]   emitter     An emitter object.
- * @param[in]       line_break  The preferred line break.
- */
-
-YAML_DECLARE(void)
-yaml_emitter_set_break(yaml_emitter_t *emitter, yaml_break_t line_break);
-
-/**
- * Emit an event.
- *
- * The event object may be generated using the yaml_parser_parse() function.
- * The emitter takes the responsibility for the event object and destroys its
- * content after it is emitted. The event object is destroyed even if the
- * function fails.
- *
- * @param[in,out]   emitter     An emitter object.
- * @param[in,out]   event       An event object.
- *
- * @returns @c 1 if the function succeeded, @c 0 on error.
- */
-
-YAML_DECLARE(int)
-yaml_emitter_emit(yaml_emitter_t *emitter, yaml_event_t *event);
-
-/**
- * Start a YAML stream.
- *
- * This function should be used before yaml_emitter_dump() is called.
- *
- * @param[in,out]   emitter     An emitter object.
- *
- * @returns @c 1 if the function succeeded, @c 0 on error.
- */
-
-YAML_DECLARE(int)
-yaml_emitter_open(yaml_emitter_t *emitter);
-
-/**
- * Finish a YAML stream.
- *
- * This function should be used after yaml_emitter_dump() is called.
- *
- * @param[in,out]   emitter     An emitter object.
- *
- * @returns @c 1 if the function succeeded, @c 0 on error.
- */
-
-YAML_DECLARE(int)
-yaml_emitter_close(yaml_emitter_t *emitter);
-
-/**
- * Emit a YAML document.
- *
- * The documen object may be generated using the yaml_parser_load() function
- * or the yaml_document_initialize() function.  The emitter takes the
- * responsibility for the document object and destoys its content after
- * it is emitted. The document object is destroyedeven if the function fails.
- *
- * @param[in,out]   emitter     An emitter object.
- * @param[in,out]   document    A document object.
- *
- * @returns @c 1 if the function succeeded, @c 0 on error.
- */
-
-YAML_DECLARE(int)
-yaml_emitter_dump(yaml_emitter_t *emitter, yaml_document_t *document);
-
-/**
- * Flush the accumulated characters to the output.
- *
- * @param[in,out]   emitter     An emitter object.
- *
- * @returns @c 1 if the function succeeded, @c 0 on error.
- */
-
-YAML_DECLARE(int)
-yaml_emitter_flush(yaml_emitter_t *emitter);
-
-/** @} */
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* #ifndef YAML_H */
-

yaml_private.h

@@ -1,640 +0,0 @@
-
-#if HAVE_CONFIG_H
-#include <config.h>
-#endif
-
-#include <yaml.h>
-
-#include <assert.h>
-#include <limits.h>
-
-/*
- * Memory management.
- */
-
-YAML_DECLARE(void *)
-yaml_malloc(size_t size);
-
-YAML_DECLARE(void *)
-yaml_realloc(void *ptr, size_t size);
-
-YAML_DECLARE(void)
-yaml_free(void *ptr);
-
-YAML_DECLARE(yaml_char_t *)
-yaml_strdup(const yaml_char_t *);
-
-/*
- * Reader: Ensure that the buffer contains at least `length` characters.
- */
-
-YAML_DECLARE(int)
-yaml_parser_update_buffer(yaml_parser_t *parser, size_t length);
-
-/*
- * Scanner: Ensure that the token stack contains at least one token ready.
- */
-
-YAML_DECLARE(int)
-yaml_parser_fetch_more_tokens(yaml_parser_t *parser);
-
-/*
- * The size of the input raw buffer.
- */
-
-#define INPUT_RAW_BUFFER_SIZE   16384
-
-/*
- * The size of the input buffer.
- *
- * It should be possible to decode the whole raw buffer.
- */
-
-#define INPUT_BUFFER_SIZE       (INPUT_RAW_BUFFER_SIZE*3)
-
-/*
- * The size of the output buffer.
- */
-
-#define OUTPUT_BUFFER_SIZE      16384
-
-/*
- * The size of the output raw buffer.
- *
- * It should be possible to encode the whole output buffer.
- */
-
-#define OUTPUT_RAW_BUFFER_SIZE  (OUTPUT_BUFFER_SIZE*2+2)
-
-/*
- * The size of other stacks and queues.
- */
-
-#define INITIAL_STACK_SIZE  16
-#define INITIAL_QUEUE_SIZE  16
-#define INITIAL_STRING_SIZE 16
-
-/*
- * Buffer management.
- */
-
-#define BUFFER_INIT(context,buffer,size)                                        \
-    (((buffer).start = yaml_malloc(size)) ?                                     \
-        ((buffer).last = (buffer).pointer = (buffer).start,                     \
-         (buffer).end = (buffer).start+(size),                                  \
-         1) :                                                                   \
-        ((context)->error = YAML_MEMORY_ERROR,                                  \
-         0))
-
-#define BUFFER_DEL(context,buffer)                                              \
-    (yaml_free((buffer).start),                                                 \
-     (buffer).start = (buffer).pointer = (buffer).end = 0)
-
-/*
- * String management.
- */
-
-typedef struct {
-    yaml_char_t *start;
-    yaml_char_t *end;
-    yaml_char_t *pointer;
-} yaml_string_t;
-
-YAML_DECLARE(int)
-yaml_string_extend(yaml_char_t **start,
-        yaml_char_t **pointer, yaml_char_t **end);
-
-YAML_DECLARE(int)
-yaml_string_join(
-        yaml_char_t **a_start, yaml_char_t **a_pointer, yaml_char_t **a_end,
-        yaml_char_t **b_start, yaml_char_t **b_pointer, yaml_char_t **b_end);
-
-#define NULL_STRING { NULL, NULL, NULL }
-
-#define STRING(string,length)   { (string), (string)+(length), (string) }
-
-#define STRING_ASSIGN(value,string,length)                                      \
-    ((value).start = (string),                                                  \
-     (value).end = (string)+(length),                                           \
-     (value).pointer = (string))
-
-#define STRING_INIT(context,string,size)                                        \
-    (((string).start = yaml_malloc(size)) ?                                     \
-        ((string).pointer = (string).start,                                     \
-         (string).end = (string).start+(size),                                  \
-         memset((string).start, 0, (size)),                                     \
-         1) :                                                                   \
-        ((context)->error = YAML_MEMORY_ERROR,                                  \
-         0))
-
-#define STRING_DEL(context,string)                                              \
-    (yaml_free((string).start),                                                 \
-     (string).start = (string).pointer = (string).end = 0)
-
-#define STRING_EXTEND(context,string)                                           \
-    (((string).pointer+5 < (string).end)                                        \
-        || yaml_string_extend(&(string).start,                                  \
-            &(string).pointer, &(string).end))
-
-#define CLEAR(context,string)                                                   \
-    ((string).pointer = (string).start,                                         \
-     memset((string).start, 0, (string).end-(string).start))
-
-#define JOIN(context,string_a,string_b)                                         \
-    ((yaml_string_join(&(string_a).start, &(string_a).pointer,                  \
-                       &(string_a).end, &(string_b).start,                      \
-                       &(string_b).pointer, &(string_b).end)) ?                 \
-        ((string_b).pointer = (string_b).start,                                 \
-         1) :                                                                   \
-        ((context)->error = YAML_MEMORY_ERROR,                                  \
-         0))
-
-/*
- * String check operations.
- */
-
-/*
- * Check the octet at the specified position.
- */
-
-#define CHECK_AT(string,octet,offset)                                           \
-    ((string).pointer[offset] == (yaml_char_t)(octet))
-
-/*
- * Check the current octet in the buffer.
- */
-
-#define CHECK(string,octet) CHECK_AT((string),(octet),0)
-
-/*
- * Check if the character at the specified position is an alphabetical
- * character, a digit, '_', or '-'.
- */
-
-#define IS_ALPHA_AT(string,offset)                                              \
-     (((string).pointer[offset] >= (yaml_char_t) '0' &&                         \
-       (string).pointer[offset] <= (yaml_char_t) '9') ||                        \
-      ((string).pointer[offset] >= (yaml_char_t) 'A' &&                         \
-       (string).pointer[offset] <= (yaml_char_t) 'Z') ||                        \
-      ((string).pointer[offset] >= (yaml_char_t) 'a' &&                         \
-       (string).pointer[offset] <= (yaml_char_t) 'z') ||                        \
-      (string).pointer[offset] == '_' ||                                        \
-      (string).pointer[offset] == '-')
-
-#define IS_ALPHA(string)    IS_ALPHA_AT((string),0)
-
-/*
- * Check if the character at the specified position is a digit.
- */
-
-#define IS_DIGIT_AT(string,offset)                                              \
-     (((string).pointer[offset] >= (yaml_char_t) '0' &&                         \
-       (string).pointer[offset] <= (yaml_char_t) '9'))
-
-#define IS_DIGIT(string)    IS_DIGIT_AT((string),0)
-
-/*
- * Get the value of a digit.
- */
-
-#define AS_DIGIT_AT(string,offset)                                              \
-     ((string).pointer[offset] - (yaml_char_t) '0')
-
-#define AS_DIGIT(string)    AS_DIGIT_AT((string),0)
-
-/*
- * Check if the character at the specified position is a hex-digit.
- */
-
-#define IS_HEX_AT(string,offset)                                                \
-     (((string).pointer[offset] >= (yaml_char_t) '0' &&                         \
-       (string).pointer[offset] <= (yaml_char_t) '9') ||                        \
-      ((string).pointer[offset] >= (yaml_char_t) 'A' &&                         \
-       (string).pointer[offset] <= (yaml_char_t) 'F') ||                        \
-      ((string).pointer[offset] >= (yaml_char_t) 'a' &&                         \
-       (string).pointer[offset] <= (yaml_char_t) 'f'))
-
-#define IS_HEX(string)    IS_HEX_AT((string),0)
-
-/*
- * Get the value of a hex-digit.
- */
-
-#define AS_HEX_AT(string,offset)                                                \
-      (((string).pointer[offset] >= (yaml_char_t) 'A' &&                        \
-        (string).pointer[offset] <= (yaml_char_t) 'F') ?                        \
-       ((string).pointer[offset] - (yaml_char_t) 'A' + 10) :                    \
-       ((string).pointer[offset] >= (yaml_char_t) 'a' &&                        \
-        (string).pointer[offset] <= (yaml_char_t) 'f') ?                        \
-       ((string).pointer[offset] - (yaml_char_t) 'a' + 10) :                    \
-       ((string).pointer[offset] - (yaml_char_t) '0'))
- 
-#define AS_HEX(string)  AS_HEX_AT((string),0)
- 
-/*
- * Check if the character is ASCII.
- */
-
-#define IS_ASCII_AT(string,offset)                                              \
-    ((string).pointer[offset] <= (yaml_char_t) '\x7F')
-
-#define IS_ASCII(string)    IS_ASCII_AT((string),0)
-
-/*
- * Check if the character can be printed unescaped.
- */
-
-#define IS_PRINTABLE_AT(string,offset)                                          \
-    (((string).pointer[offset] == 0x0A)         /* . == #x0A */                 \
-     || ((string).pointer[offset] >= 0x20       /* #x20 <= . <= #x7E */         \
-         && (string).pointer[offset] <= 0x7E)                                   \
-     || ((string).pointer[offset] == 0xC2       /* #0xA0 <= . <= #xD7FF */      \
-         && (string).pointer[offset+1] >= 0xA0)                                 \
-     || ((string).pointer[offset] > 0xC2                                        \
-         && (string).pointer[offset] < 0xED)                                    \
-     || ((string).pointer[offset] == 0xED                                       \
-         && (string).pointer[offset+1] < 0xA0)                                  \
-     || ((string).pointer[offset] == 0xEE)                                      \
-     || ((string).pointer[offset] == 0xEF      /* #xE000 <= . <= #xFFFD */      \
-         && !((string).pointer[offset+1] == 0xBB        /* && . != #xFEFF */    \
-             && (string).pointer[offset+2] == 0xBF)                             \
-         && !((string).pointer[offset+1] == 0xBF                                \
-             && ((string).pointer[offset+2] == 0xBE                             \
-                 || (string).pointer[offset+2] == 0xBF))))
-
-#define IS_PRINTABLE(string)    IS_PRINTABLE_AT((string),0)
-
-/*
- * Check if the character at the specified position is NUL.
- */
-
-#define IS_Z_AT(string,offset)    CHECK_AT((string),'\0',(offset))
-
-#define IS_Z(string)    IS_Z_AT((string),0)
-
-/*
- * Check if the character at the specified position is BOM.
- */
-
-#define IS_BOM_AT(string,offset)                                                \
-     (CHECK_AT((string),'\xEF',(offset))                                        \
-      && CHECK_AT((string),'\xBB',(offset)+1)                                   \
-      && CHECK_AT((string),'\xBF',(offset)+2))  /* BOM (#xFEFF) */
-
-#define IS_BOM(string)  IS_BOM_AT(string,0)
-
-/*
- * Check if the character at the specified position is space.
- */
-
-#define IS_SPACE_AT(string,offset)  CHECK_AT((string),' ',(offset))
-
-#define IS_SPACE(string)    IS_SPACE_AT((string),0)
-
-/*
- * Check if the character at the specified position is tab.
- */
-
-#define IS_TAB_AT(string,offset)    CHECK_AT((string),'\t',(offset))
-
-#define IS_TAB(string)  IS_TAB_AT((string),0)
-
-/*
- * Check if the character at the specified position is blank (space or tab).
- */
-
-#define IS_BLANK_AT(string,offset)                                              \
-    (IS_SPACE_AT((string),(offset)) || IS_TAB_AT((string),(offset)))
-
-#define IS_BLANK(string)    IS_BLANK_AT((string),0)
-
-/*
- * Check if the character at the specified position is a line break.
- */
-
-#define IS_BREAK_AT(string,offset)                                              \
-    (CHECK_AT((string),'\r',(offset))               /* CR (#xD)*/               \
-     || CHECK_AT((string),'\n',(offset))            /* LF (#xA) */              \
-     || (CHECK_AT((string),'\xC2',(offset))                                     \
-         && CHECK_AT((string),'\x85',(offset)+1))   /* NEL (#x85) */            \
-     || (CHECK_AT((string),'\xE2',(offset))                                     \
-         && CHECK_AT((string),'\x80',(offset)+1)                                \
-         && CHECK_AT((string),'\xA8',(offset)+2))   /* LS (#x2028) */           \
-     || (CHECK_AT((string),'\xE2',(offset))                                     \
-         && CHECK_AT((string),'\x80',(offset)+1)                                \
-         && CHECK_AT((string),'\xA9',(offset)+2)))  /* PS (#x2029) */
-
-#define IS_BREAK(string)    IS_BREAK_AT((string),0)
-
-#define IS_CRLF_AT(string,offset)                                               \
-     (CHECK_AT((string),'\r',(offset)) && CHECK_AT((string),'\n',(offset)+1))
-
-#define IS_CRLF(string) IS_CRLF_AT((string),0)
-
-/*
- * Check if the character is a line break or NUL.
- */
-
-#define IS_BREAKZ_AT(string,offset)                                             \
-    (IS_BREAK_AT((string),(offset)) || IS_Z_AT((string),(offset)))
-
-#define IS_BREAKZ(string)   IS_BREAKZ_AT((string),0)
-
-/*
- * Check if the character is a line break, space, or NUL.
- */
-
-#define IS_SPACEZ_AT(string,offset)                                             \
-    (IS_SPACE_AT((string),(offset)) || IS_BREAKZ_AT((string),(offset)))
-
-#define IS_SPACEZ(string)   IS_SPACEZ_AT((string),0)
-
-/*
- * Check if the character is a line break, space, tab, or NUL.
- */
-
-#define IS_BLANKZ_AT(string,offset)                                             \
-    (IS_BLANK_AT((string),(offset)) || IS_BREAKZ_AT((string),(offset)))
-
-#define IS_BLANKZ(string)   IS_BLANKZ_AT((string),0)
-
-/*
- * Determine the width of the character.
- */
-
-#define WIDTH_AT(string,offset)                                                 \
-     (((string).pointer[offset] & 0x80) == 0x00 ? 1 :                           \
-      ((string).pointer[offset] & 0xE0) == 0xC0 ? 2 :                           \
-      ((string).pointer[offset] & 0xF0) == 0xE0 ? 3 :                           \
-      ((string).pointer[offset] & 0xF8) == 0xF0 ? 4 : 0)
-
-#define WIDTH(string)   WIDTH_AT((string),0)
-
-/*
- * Move the string pointer to the next character.
- */
-
-#define MOVE(string)    ((string).pointer += WIDTH((string)))
-
-/*
- * Copy a character and move the pointers of both strings.
- */
-
-#define COPY(string_a,string_b)                                                 \
-    ((*(string_b).pointer & 0x80) == 0x00 ?                                     \
-     (*((string_a).pointer++) = *((string_b).pointer++)) :                      \
-     (*(string_b).pointer & 0xE0) == 0xC0 ?                                     \
-     (*((string_a).pointer++) = *((string_b).pointer++),                        \
-      *((string_a).pointer++) = *((string_b).pointer++)) :                      \
-     (*(string_b).pointer & 0xF0) == 0xE0 ?                                     \
-     (*((string_a).pointer++) = *((string_b).pointer++),                        \
-      *((string_a).pointer++) = *((string_b).pointer++),                        \
-      *((string_a).pointer++) = *((string_b).pointer++)) :                      \
-     (*(string_b).pointer & 0xF8) == 0xF0 ?                                     \
-     (*((string_a).pointer++) = *((string_b).pointer++),                        \
-      *((string_a).pointer++) = *((string_b).pointer++),                        \
-      *((string_a).pointer++) = *((string_b).pointer++),                        \
-      *((string_a).pointer++) = *((string_b).pointer++)) : 0)
-
-/*
- * Stack and queue management.
- */
-
-YAML_DECLARE(int)
-yaml_stack_extend(void **start, void **top, void **end);
-
-YAML_DECLARE(int)
-yaml_queue_extend(void **start, void **head, void **tail, void **end);
-
-#define STACK_INIT(context,stack,size)                                          \
-    (((stack).start = yaml_malloc((size)*sizeof(*(stack).start))) ?             \
-        ((stack).top = (stack).start,                                           \
-         (stack).end = (stack).start+(size),                                    \
-         1) :                                                                   \
-        ((context)->error = YAML_MEMORY_ERROR,                                  \
-         0))
-
-#define STACK_DEL(context,stack)                                                \
-    (yaml_free((stack).start),                                                  \
-     (stack).start = (stack).top = (stack).end = 0)
-
-#define STACK_EMPTY(context,stack)                                              \
-    ((stack).start == (stack).top)
-
-#define PUSH(context,stack,value)                                               \
-    (((stack).top != (stack).end                                                \
-      || yaml_stack_extend((void **)&(stack).start,                             \
-              (void **)&(stack).top, (void **)&(stack).end)) ?                  \
-        (*((stack).top++) = value,                                              \
-         1) :                                                                   \
-        ((context)->error = YAML_MEMORY_ERROR,                                  \
-         0))
-
-#define POP(context,stack)                                                      \
-    (*(--(stack).top))
-
-#define QUEUE_INIT(context,queue,size)                                          \
-    (((queue).start = yaml_malloc((size)*sizeof(*(queue).start))) ?             \
-        ((queue).head = (queue).tail = (queue).start,                           \
-         (queue).end = (queue).start+(size),                                    \
-         1) :                                                                   \
-        ((context)->error = YAML_MEMORY_ERROR,                                  \
-         0))
-
-#define QUEUE_DEL(context,queue)                                                \
-    (yaml_free((queue).start),                                                  \
-     (queue).start = (queue).head = (queue).tail = (queue).end = 0)
-
-#define QUEUE_EMPTY(context,queue)                                              \
-    ((queue).head == (queue).tail)
-
-#define ENQUEUE(context,queue,value)                                            \
-    (((queue).tail != (queue).end                                               \
-      || yaml_queue_extend((void **)&(queue).start, (void **)&(queue).head,     \
-            (void **)&(queue).tail, (void **)&(queue).end)) ?                   \
-        (*((queue).tail++) = value,                                             \
-         1) :                                                                   \
-        ((context)->error = YAML_MEMORY_ERROR,                                  \
-         0))
-
-#define DEQUEUE(context,queue)                                                  \
-    (*((queue).head++))
-
-#define QUEUE_INSERT(context,queue,index,value)                                 \
-    (((queue).tail != (queue).end                                               \
-      || yaml_queue_extend((void **)&(queue).start, (void **)&(queue).head,     \
-            (void **)&(queue).tail, (void **)&(queue).end)) ?                   \
-        (memmove((queue).head+(index)+1,(queue).head+(index),                   \
-            ((queue).tail-(queue).head-(index))*sizeof(*(queue).start)),        \
-         *((queue).head+(index)) = value,                                       \
-         (queue).tail++,                                                        \
-         1) :                                                                   \
-        ((context)->error = YAML_MEMORY_ERROR,                                  \
-         0))
-
-/*
- * Token initializers.
- */
-
-#define TOKEN_INIT(token,token_type,token_start_mark,token_end_mark)            \
-    (memset(&(token), 0, sizeof(yaml_token_t)),                                 \
-     (token).type = (token_type),                                               \
-     (token).start_mark = (token_start_mark),                                   \
-     (token).end_mark = (token_end_mark))
-
-#define STREAM_START_TOKEN_INIT(token,token_encoding,start_mark,end_mark)       \
-    (TOKEN_INIT((token),YAML_STREAM_START_TOKEN,(start_mark),(end_mark)),       \
-     (token).data.stream_start.encoding = (token_encoding))
-
-#define STREAM_END_TOKEN_INIT(token,start_mark,end_mark)                        \
-    (TOKEN_INIT((token),YAML_STREAM_END_TOKEN,(start_mark),(end_mark)))
-
-#define ALIAS_TOKEN_INIT(token,token_value,start_mark,end_mark)                 \
-    (TOKEN_INIT((token),YAML_ALIAS_TOKEN,(start_mark),(end_mark)),              \
-     (token).data.alias.value = (token_value))
-
-#define ANCHOR_TOKEN_INIT(token,token_value,start_mark,end_mark)                \
-    (TOKEN_INIT((token),YAML_ANCHOR_TOKEN,(start_mark),(end_mark)),             \
-     (token).data.anchor.value = (token_value))
-
-#define TAG_TOKEN_INIT(token,token_handle,token_suffix,start_mark,end_mark)     \
-    (TOKEN_INIT((token),YAML_TAG_TOKEN,(start_mark),(end_mark)),                \
-     (token).data.tag.handle = (token_handle),                                  \
-     (token).data.tag.suffix = (token_suffix))
-
-#define SCALAR_TOKEN_INIT(token,token_value,token_length,token_style,start_mark,end_mark)   \
-    (TOKEN_INIT((token),YAML_SCALAR_TOKEN,(start_mark),(end_mark)),             \
-     (token).data.scalar.value = (token_value),                                 \
-     (token).data.scalar.length = (token_length),                               \
-     (token).data.scalar.style = (token_style))
-
-#define VERSION_DIRECTIVE_TOKEN_INIT(token,token_major,token_minor,start_mark,end_mark)     \
-    (TOKEN_INIT((token),YAML_VERSION_DIRECTIVE_TOKEN,(start_mark),(end_mark)),  \
-     (token).data.version_directive.major = (token_major),                      \
-     (token).data.version_directive.minor = (token_minor))
-
-#define TAG_DIRECTIVE_TOKEN_INIT(token,token_handle,token_prefix,start_mark,end_mark)       \
-    (TOKEN_INIT((token),YAML_TAG_DIRECTIVE_TOKEN,(start_mark),(end_mark)),      \
-     (token).data.tag_directive.handle = (token_handle),                        \
-     (token).data.tag_directive.prefix = (token_prefix))
-
-/*
- * Event initializers.
- */
-
-#define EVENT_INIT(event,event_type,event_start_mark,event_end_mark)            \
-    (memset(&(event), 0, sizeof(yaml_event_t)),                                 \
-     (event).type = (event_type),                                               \
-     (event).start_mark = (event_start_mark),                                   \
-     (event).end_mark = (event_end_mark))
-
-#define STREAM_START_EVENT_INIT(event,event_encoding,start_mark,end_mark)       \
-    (EVENT_INIT((event),YAML_STREAM_START_EVENT,(start_mark),(end_mark)),       \
-     (event).data.stream_start.encoding = (event_encoding))
-
-#define STREAM_END_EVENT_INIT(event,start_mark,end_mark)                        \
-    (EVENT_INIT((event),YAML_STREAM_END_EVENT,(start_mark),(end_mark)))
-
-#define DOCUMENT_START_EVENT_INIT(event,event_version_directive,                \
-        event_tag_directives_start,event_tag_directives_end,event_implicit,start_mark,end_mark) \
-    (EVENT_INIT((event),YAML_DOCUMENT_START_EVENT,(start_mark),(end_mark)),     \
-     (event).data.document_start.version_directive = (event_version_directive), \
-     (event).data.document_start.tag_directives.start = (event_tag_directives_start),   \
-     (event).data.document_start.tag_directives.end = (event_tag_directives_end),   \
-     (event).data.document_start.implicit = (event_implicit))
-
-#define DOCUMENT_END_EVENT_INIT(event,event_implicit,start_mark,end_mark)       \
-    (EVENT_INIT((event),YAML_DOCUMENT_END_EVENT,(start_mark),(end_mark)),       \
-     (event).data.document_end.implicit = (event_implicit))
-
-#define ALIAS_EVENT_INIT(event,event_anchor,start_mark,end_mark)                \
-    (EVENT_INIT((event),YAML_ALIAS_EVENT,(start_mark),(end_mark)),              \
-     (event).data.alias.anchor = (event_anchor))
-
-#define SCALAR_EVENT_INIT(event,event_anchor,event_tag,event_value,event_length,    \
-        event_plain_implicit, event_quoted_implicit,event_style,start_mark,end_mark)    \
-    (EVENT_INIT((event),YAML_SCALAR_EVENT,(start_mark),(end_mark)),             \
-     (event).data.scalar.anchor = (event_anchor),                               \
-     (event).data.scalar.tag = (event_tag),                                     \
-     (event).data.scalar.value = (event_value),                                 \
-     (event).data.scalar.length = (event_length),                               \
-     (event).data.scalar.plain_implicit = (event_plain_implicit),               \
-     (event).data.scalar.quoted_implicit = (event_quoted_implicit),             \
-     (event).data.scalar.style = (event_style))
-
-#define SEQUENCE_START_EVENT_INIT(event,event_anchor,event_tag,                 \
-        event_implicit,event_style,start_mark,end_mark)                         \
-    (EVENT_INIT((event),YAML_SEQUENCE_START_EVENT,(start_mark),(end_mark)),     \
-     (event).data.sequence_start.anchor = (event_anchor),                       \
-     (event).data.sequence_start.tag = (event_tag),                             \
-     (event).data.sequence_start.implicit = (event_implicit),                   \
-     (event).data.sequence_start.style = (event_style))
-
-#define SEQUENCE_END_EVENT_INIT(event,start_mark,end_mark)                      \
-    (EVENT_INIT((event),YAML_SEQUENCE_END_EVENT,(start_mark),(end_mark)))
-
-#define MAPPING_START_EVENT_INIT(event,event_anchor,event_tag,                  \
-        event_implicit,event_style,start_mark,end_mark)                         \
-    (EVENT_INIT((event),YAML_MAPPING_START_EVENT,(start_mark),(end_mark)),      \
-     (event).data.mapping_start.anchor = (event_anchor),                        \
-     (event).data.mapping_start.tag = (event_tag),                              \
-     (event).data.mapping_start.implicit = (event_implicit),                    \
-     (event).data.mapping_start.style = (event_style))
-
-#define MAPPING_END_EVENT_INIT(event,start_mark,end_mark)                       \
-    (EVENT_INIT((event),YAML_MAPPING_END_EVENT,(start_mark),(end_mark)))
-
-/*
- * Document initializer.
- */
-
-#define DOCUMENT_INIT(document,document_nodes_start,document_nodes_end,         \
-        document_version_directive,document_tag_directives_start,               \
-        document_tag_directives_end,document_start_implicit,                    \
-        document_end_implicit,document_start_mark,document_end_mark)            \
-    (memset(&(document), 0, sizeof(yaml_document_t)),                           \
-     (document).nodes.start = (document_nodes_start),                           \
-     (document).nodes.end = (document_nodes_end),                               \
-     (document).nodes.top = (document_nodes_start),                             \
-     (document).version_directive = (document_version_directive),               \
-     (document).tag_directives.start = (document_tag_directives_start),         \
-     (document).tag_directives.end = (document_tag_directives_end),             \
-     (document).start_implicit = (document_start_implicit),                     \
-     (document).end_implicit = (document_end_implicit),                         \
-     (document).start_mark = (document_start_mark),                             \
-     (document).end_mark = (document_end_mark))
-
-/*
- * Node initializers.
- */
-
-#define NODE_INIT(node,node_type,node_tag,node_start_mark,node_end_mark)        \
-    (memset(&(node), 0, sizeof(yaml_node_t)),                                   \
-     (node).type = (node_type),                                                 \
-     (node).tag = (node_tag),                                                   \
-     (node).start_mark = (node_start_mark),                                     \
-     (node).end_mark = (node_end_mark))
-
-#define SCALAR_NODE_INIT(node,node_tag,node_value,node_length,                  \
-        node_style,start_mark,end_mark)                                         \
-    (NODE_INIT((node),YAML_SCALAR_NODE,(node_tag),(start_mark),(end_mark)),     \
-     (node).data.scalar.value = (node_value),                                   \
-     (node).data.scalar.length = (node_length),                                 \
-     (node).data.scalar.style = (node_style))
-
-#define SEQUENCE_NODE_INIT(node,node_tag,node_items_start,node_items_end,       \
-        node_style,start_mark,end_mark)                                         \
-    (NODE_INIT((node),YAML_SEQUENCE_NODE,(node_tag),(start_mark),(end_mark)),   \
-     (node).data.sequence.items.start = (node_items_start),                     \
-     (node).data.sequence.items.end = (node_items_end),                         \
-     (node).data.sequence.items.top = (node_items_start),                       \
-     (node).data.sequence.style = (node_style))
-
-#define MAPPING_NODE_INIT(node,node_tag,node_pairs_start,node_pairs_end,        \
-        node_style,start_mark,end_mark)                                         \
-    (NODE_INIT((node),YAML_MAPPING_NODE,(node_tag),(start_mark),(end_mark)),    \
-     (node).data.mapping.pairs.start = (node_pairs_start),                      \
-     (node).data.mapping.pairs.end = (node_pairs_end),                          \
-     (node).data.mapping.pairs.top = (node_pairs_start),                        \
-     (node).data.mapping.style = (node_style))
-