merge

api_tests/config_test.go

@@ -2,9 +2,10 @@ package test
 
 import (
 	"encoding/json"
+	"testing"
+
 	"github.com/json-iterator/go"
 	"github.com/stretchr/testify/require"
-	"testing"
 )
 
 func Test_use_number_for_unmarshal(t *testing.T) {
@@ -45,3 +46,129 @@ func Test_read_large_number_as_interface(t *testing.T) {
 	should.Nil(err)
 	should.Equal(`123456789123456789123456789`, output)
 }
+
+type caseSensitiveStruct struct {
+	A string `json:"a"`
+	B string `json:"b,omitempty"`
+	C *C     `json:"C,omitempty"`
+}
+
+type C struct {
+	D int64 `json:"D,omitempty"`
+	E *E    `json:"e,omitempty"`
+}
+
+type E struct {
+	F string `json:"F,omitempty"`
+}
+
+func Test_CaseSensitive(t *testing.T) {
+	should := require.New(t)
+
+	testCases := []struct {
+		input          string
+		expectedOutput string
+		caseSensitive  bool
+	}{
+		{
+			input:          `{"A":"foo","B":"bar"}`,
+			expectedOutput: `{"a":"foo","b":"bar"}`,
+			caseSensitive:  false,
+		},
+		{
+			input:          `{"a":"foo","b":"bar"}`,
+			expectedOutput: `{"a":"foo","b":"bar"}`,
+			caseSensitive:  true,
+		},
+		{
+			input:          `{"a":"foo","b":"bar","C":{"D":10}}`,
+			expectedOutput: `{"a":"foo","b":"bar","C":{"D":10}}`,
+			caseSensitive:  true,
+		},
+		{
+			input:          `{"a":"foo","B":"bar","c":{"d":10}}`,
+			expectedOutput: `{"a":"foo"}`,
+			caseSensitive:  true,
+		},
+		{
+			input:          `{"a":"foo","C":{"d":10}}`,
+			expectedOutput: `{"a":"foo","C":{}}`,
+			caseSensitive:  true,
+		},
+		{
+			input:          `{"a":"foo","C":{"D":10,"e":{"f":"baz"}}}`,
+			expectedOutput: `{"a":"foo","C":{"D":10,"e":{}}}`,
+			caseSensitive:  true,
+		},
+		{
+			input:          `{"a":"foo","C":{"D":10,"e":{"F":"baz"}}}`,
+			expectedOutput: `{"a":"foo","C":{"D":10,"e":{"F":"baz"}}}`,
+			caseSensitive:  true,
+		},
+		{
+			input:          `{"A":"foo","c":{"d":10,"E":{"f":"baz"}}}`,
+			expectedOutput: `{"a":"foo","C":{"D":10,"e":{"F":"baz"}}}`,
+			caseSensitive:  false,
+		},
+	}
+
+	for _, tc := range testCases {
+		val := caseSensitiveStruct{}
+		err := jsoniter.Config{CaseSensitive: tc.caseSensitive}.Froze().UnmarshalFromString(tc.input, &val)
+		should.Nil(err)
+
+		output, err := jsoniter.MarshalToString(val)
+		should.Nil(err)
+		should.Equal(tc.expectedOutput, output)
+	}
+}
+
+type structWithElevenFields struct {
+	A string `json:"A,omitempty"`
+	B string `json:"B,omitempty"`
+	C string `json:"C,omitempty"`
+	D string `json:"d,omitempty"`
+	E string `json:"e,omitempty"`
+	F string `json:"f,omitempty"`
+	G string `json:"g,omitempty"`
+	H string `json:"h,omitempty"`
+	I string `json:"i,omitempty"`
+	J string `json:"j,omitempty"`
+	K string `json:"k,omitempty"`
+}
+
+func Test_CaseSensitive_MoreThanTenFields(t *testing.T) {
+	should := require.New(t)
+
+	testCases := []struct {
+		input          string
+		expectedOutput string
+		caseSensitive  bool
+	}{
+		{
+			input:          `{"A":"1","B":"2","C":"3","d":"4","e":"5","f":"6","g":"7","h":"8","i":"9","j":"10","k":"11"}`,
+			expectedOutput: `{"A":"1","B":"2","C":"3","d":"4","e":"5","f":"6","g":"7","h":"8","i":"9","j":"10","k":"11"}`,
+			caseSensitive:  true,
+		},
+		{
+			input:          `{"a":"1","b":"2","c":"3","D":"4","E":"5","F":"6"}`,
+			expectedOutput: `{"A":"1","B":"2","C":"3","d":"4","e":"5","f":"6"}`,
+			caseSensitive:  false,
+		},
+		{
+			input:          `{"A":"1","b":"2","d":"4","E":"5"}`,
+			expectedOutput: `{"A":"1","d":"4"}`,
+			caseSensitive:  true,
+		},
+	}
+
+	for _, tc := range testCases {
+		val := structWithElevenFields{}
+		err := jsoniter.Config{CaseSensitive: tc.caseSensitive}.Froze().UnmarshalFromString(tc.input, &val)
+		should.Nil(err)
+
+		output, err := jsoniter.MarshalToString(val)
+		should.Nil(err)
+		should.Equal(tc.expectedOutput, output)
+	}
+}

config.go

@@ -2,12 +2,13 @@ package jsoniter
 
 import (
 	"encoding/json"
-	"github.com/modern-go/concurrent"
-	"github.com/modern-go/reflect2"
 	"io"
 	"reflect"
 	"sync"
 	"unsafe"
+
+	"github.com/modern-go/concurrent"
+	"github.com/modern-go/reflect2"
 )
 
 // Config customize how the API should behave.
@@ -23,6 +24,7 @@ type Config struct {
 	OnlyTaggedField               bool
 	ValidateJsonRawMessage        bool
 	ObjectFieldMustBeSimpleString bool
+	CaseSensitive                 bool
 }
 
 // API the public interface of this package.
@@ -75,6 +77,7 @@ type frozenConfig struct {
 	extensions                    []Extension
 	streamPool                    *sync.Pool
 	iteratorPool                  *sync.Pool
+	caseSensitive                 bool
 }
 
 func (cfg *frozenConfig) initCache() {
@@ -128,6 +131,7 @@ func (cfg Config) Froze() API {
 		objectFieldMustBeSimpleString: cfg.ObjectFieldMustBeSimpleString,
 		onlyTaggedField:               cfg.OnlyTaggedField,
 		disallowUnknownFields:         cfg.DisallowUnknownFields,
+		caseSensitive:                 cfg.CaseSensitive,
 	}
 	api.streamPool = &sync.Pool{
 		New: func() interface{} {

iter_object.go

@@ -60,7 +60,7 @@ func (iter *Iterator) readFieldHash() int64 {
 			if b == '\\' {
 				iter.head = i
 				for _, b := range iter.readStringSlowPath() {
-					if 'A' <= b && b <= 'Z' {
+					if 'A' <= b && b <= 'Z' && !iter.cfg.caseSensitive {
 						b += 'a' - 'A'
 					}
 					hash ^= int64(b)
@@ -82,7 +82,7 @@ func (iter *Iterator) readFieldHash() int64 {
 				}
 				return hash
 			}
-			if 'A' <= b && b <= 'Z' {
+			if 'A' <= b && b <= 'Z' && !iter.cfg.caseSensitive {
 				b += 'a' - 'A'
 			}
 			hash ^= int64(b)
@@ -95,10 +95,14 @@ func (iter *Iterator) readFieldHash() int64 {
 	}
 }
 
-func calcHash(str string) int64 {
+func calcHash(str string, caseSensitive bool) int64 {
 	hash := int64(0x811c9dc5)
 	for _, b := range str {
-		hash ^= int64(unicode.ToLower(b))
+		if caseSensitive {
+			hash ^= int64(b)
+		} else {
+			hash ^= int64(unicode.ToLower(b))
+		}
 		hash *= 0x1000193
 	}
 	return int64(hash)

reflect.go

@@ -2,9 +2,10 @@ package jsoniter
 
 import (
 	"fmt"
-	"github.com/modern-go/reflect2"
 	"reflect"
 	"unsafe"
+
+	"github.com/modern-go/reflect2"
 )
 
 // ValDecoder is an internal type registered to cache as needed.
@@ -40,6 +41,14 @@ type ctx struct {
 	decoders map[reflect2.Type]ValDecoder
 }
 
+func (b *ctx) caseSensitive() bool {
+	if b.frozenConfig == nil {
+		// default is case-insensitive
+		return false
+	}
+	return b.frozenConfig.caseSensitive
+}
+
 func (b *ctx) append(prefix string) *ctx {
 	return &ctx{
 		frozenConfig: b.frozenConfig,

reflect_struct_decoder.go

@@ -2,10 +2,11 @@ package jsoniter
 
 import (
 	"fmt"
-	"github.com/modern-go/reflect2"
 	"io"
 	"strings"
 	"unsafe"
+
+	"github.com/modern-go/reflect2"
 )
 
 func decoderOfStruct(ctx *ctx, typ reflect2.Type) ValDecoder {
@@ -31,11 +32,15 @@ func decoderOfStruct(ctx *ctx, typ reflect2.Type) ValDecoder {
 	for k, binding := range bindings {
 		fields[k] = binding.Decoder.(*structFieldDecoder)
 	}
-	for k, binding := range bindings {
-		if _, found := fields[strings.ToLower(k)]; !found {
-			fields[strings.ToLower(k)] = binding.Decoder.(*structFieldDecoder)
+
+	if !ctx.caseSensitive() {
+		for k, binding := range bindings {
+			if _, found := fields[strings.ToLower(k)]; !found {
+				fields[strings.ToLower(k)] = binding.Decoder.(*structFieldDecoder)
+			}
 		}
 	}
+
 	return createStructDecoder(ctx, typ, fields)
 }
 
@@ -46,12 +51,13 @@ func createStructDecoder(ctx *ctx, typ reflect2.Type, fields map[string]*structF
 	knownHash := map[int64]struct{}{
 		0: {},
 	}
+
 	switch len(fields) {
 	case 0:
 		return &skipObjectDecoder{typ}
 	case 1:
 		for fieldName, fieldDecoder := range fields {
-			fieldHash := calcHash(fieldName)
+			fieldHash := calcHash(fieldName, ctx.caseSensitive())
 			_, known := knownHash[fieldHash]
 			if known {
 				return &generalStructDecoder{typ, fields, false}
@@ -65,7 +71,7 @@ func createStructDecoder(ctx *ctx, typ reflect2.Type, fields map[string]*structF
 		var fieldDecoder1 *structFieldDecoder
 		var fieldDecoder2 *structFieldDecoder
 		for fieldName, fieldDecoder := range fields {
-			fieldHash := calcHash(fieldName)
+			fieldHash := calcHash(fieldName, ctx.caseSensitive())
 			_, known := knownHash[fieldHash]
 			if known {
 				return &generalStructDecoder{typ, fields, false}
@@ -88,7 +94,7 @@ func createStructDecoder(ctx *ctx, typ reflect2.Type, fields map[string]*structF
 		var fieldDecoder2 *structFieldDecoder
 		var fieldDecoder3 *structFieldDecoder
 		for fieldName, fieldDecoder := range fields {
-			fieldHash := calcHash(fieldName)
+			fieldHash := calcHash(fieldName, ctx.caseSensitive())
 			_, known := knownHash[fieldHash]
 			if known {
 				return &generalStructDecoder{typ, fields, false}
@@ -119,7 +125,7 @@ func createStructDecoder(ctx *ctx, typ reflect2.Type, fields map[string]*structF
 		var fieldDecoder3 *structFieldDecoder
 		var fieldDecoder4 *structFieldDecoder
 		for fieldName, fieldDecoder := range fields {
-			fieldHash := calcHash(fieldName)
+			fieldHash := calcHash(fieldName, ctx.caseSensitive())
 			_, known := knownHash[fieldHash]
 			if known {
 				return &generalStructDecoder{typ, fields, false}
@@ -156,7 +162,7 @@ func createStructDecoder(ctx *ctx, typ reflect2.Type, fields map[string]*structF
 		var fieldDecoder4 *structFieldDecoder
 		var fieldDecoder5 *structFieldDecoder
 		for fieldName, fieldDecoder := range fields {
-			fieldHash := calcHash(fieldName)
+			fieldHash := calcHash(fieldName, ctx.caseSensitive())
 			_, known := knownHash[fieldHash]
 			if known {
 				return &generalStructDecoder{typ, fields, false}
@@ -199,7 +205,7 @@ func createStructDecoder(ctx *ctx, typ reflect2.Type, fields map[string]*structF
 		var fieldDecoder5 *structFieldDecoder
 		var fieldDecoder6 *structFieldDecoder
 		for fieldName, fieldDecoder := range fields {
-			fieldHash := calcHash(fieldName)
+			fieldHash := calcHash(fieldName, ctx.caseSensitive())
 			_, known := knownHash[fieldHash]
 			if known {
 				return &generalStructDecoder{typ, fields, false}
@@ -248,7 +254,7 @@ func createStructDecoder(ctx *ctx, typ reflect2.Type, fields map[string]*structF
 		var fieldDecoder6 *structFieldDecoder
 		var fieldDecoder7 *structFieldDecoder
 		for fieldName, fieldDecoder := range fields {
-			fieldHash := calcHash(fieldName)
+			fieldHash := calcHash(fieldName, ctx.caseSensitive())
 			_, known := knownHash[fieldHash]
 			if known {
 				return &generalStructDecoder{typ, fields, false}
@@ -303,7 +309,7 @@ func createStructDecoder(ctx *ctx, typ reflect2.Type, fields map[string]*structF
 		var fieldDecoder7 *structFieldDecoder
 		var fieldDecoder8 *structFieldDecoder
 		for fieldName, fieldDecoder := range fields {
-			fieldHash := calcHash(fieldName)
+			fieldHash := calcHash(fieldName, ctx.caseSensitive())
 			_, known := knownHash[fieldHash]
 			if known {
 				return &generalStructDecoder{typ, fields, false}
@@ -364,7 +370,7 @@ func createStructDecoder(ctx *ctx, typ reflect2.Type, fields map[string]*structF
 		var fieldDecoder8 *structFieldDecoder
 		var fieldDecoder9 *structFieldDecoder
 		for fieldName, fieldDecoder := range fields {
-			fieldHash := calcHash(fieldName)
+			fieldHash := calcHash(fieldName, ctx.caseSensitive())
 			_, known := knownHash[fieldHash]
 			if known {
 				return &generalStructDecoder{typ, fields, false}
@@ -431,7 +437,7 @@ func createStructDecoder(ctx *ctx, typ reflect2.Type, fields map[string]*structF
 		var fieldDecoder9 *structFieldDecoder
 		var fieldDecoder10 *structFieldDecoder
 		for fieldName, fieldDecoder := range fields {
-			fieldHash := calcHash(fieldName)
+			fieldHash := calcHash(fieldName, ctx.caseSensitive())
 			_, known := knownHash[fieldHash]
 			if known {
 				return &generalStructDecoder{typ, fields, false}
@@ -513,13 +519,13 @@ func (decoder *generalStructDecoder) decodeOneField(ptr unsafe.Pointer, iter *It
 		fieldBytes := iter.ReadStringAsSlice()
 		field = *(*string)(unsafe.Pointer(&fieldBytes))
 		fieldDecoder = decoder.fields[field]
-		if fieldDecoder == nil {
+		if fieldDecoder == nil && !iter.cfg.caseSensitive {
 			fieldDecoder = decoder.fields[strings.ToLower(field)]
 		}
 	} else {
 		field = iter.ReadString()
 		fieldDecoder = decoder.fields[field]
-		if fieldDecoder == nil {
+		if fieldDecoder == nil && !iter.cfg.caseSensitive {
 			fieldDecoder = decoder.fields[strings.ToLower(field)]
 		}
 	}