#185 add jsoniter.Valid

feature_adapter.go

@@ -125,3 +125,8 @@ func (adapter *Encoder) SetEscapeHTML(escapeHTML bool) {
 	config.EscapeHTML = escapeHTML
 	adapter.stream.cfg = config.Froze().(*frozenConfig)
 }
+
+// Valid reports whether data is a valid JSON encoding.
+func Valid(data []byte) bool {
+	return ConfigDefault.Valid(data)
+}

feature_config.go

@@ -45,6 +45,7 @@ type API interface {
 	Get(data []byte, path ...interface{}) Any
 	NewEncoder(writer io.Writer) *Encoder
 	NewDecoder(reader io.Reader) *Decoder
+	Valid(data []byte) bool
 }
 
 // ConfigDefault the default API
@@ -333,3 +334,10 @@ func (cfg *frozenConfig) NewDecoder(reader io.Reader) *Decoder {
 	iter := Parse(cfg, reader, 512)
 	return &Decoder{iter}
 }
+
+func (cfg *frozenConfig) Valid(data []byte) bool {
+	iter := cfg.BorrowIterator(data)
+	defer cfg.ReturnIterator(iter)
+	iter.Skip()
+	return iter.Error == nil
+}

feature_iter.go

@@ -215,7 +215,7 @@ func (iter *Iterator) ReportError(operation string, msg string) {
 	}
 	context := string(iter.buf[contextStart:contextEnd])
 	iter.Error = fmt.Errorf("%s: %s, error found in #%v byte of ...|%s|..., bigger context ...|%s|...",
-		operation, msg, iter.head - peekStart, parsing, context)
+		operation, msg, iter.head-peekStart, parsing, context)
 }
 
 // CurrentBuffer gets current buffer as string for debugging purpose

feature_iter_array.go

@@ -42,7 +42,7 @@ func (iter *Iterator) ReadArrayCB(callback func(*Iterator) bool) (ret bool) {
 				c = iter.nextToken()
 			}
 			if c != ']' {
-				iter.ReportError("ReadArrayCB", "expect ] in the end, but found " + string([]byte{c}))
+				iter.ReportError("ReadArrayCB", "expect ] in the end, but found "+string([]byte{c}))
 				return false
 			}
 			return true

feature_iter_object.go

@@ -24,7 +24,7 @@ func (iter *Iterator) ReadObject() (ret string) {
 		if c == '}' {
 			return "" // end of object
 		}
-		iter.ReportError("ReadObject", `expect " after {, but found ` + string([]byte{c}))
+		iter.ReportError("ReadObject", `expect " after {, but found `+string([]byte{c}))
 		return
 	case ',':
 		return string(iter.readObjectFieldAsBytes())
@@ -105,14 +105,14 @@ func (iter *Iterator) ReadObjectCB(callback func(*Iterator, string) bool) bool {
 		if c == '}' {
 			return true
 		}
-		iter.ReportError("ReadObjectCB", `expect " after }, but found ` + string([]byte{c}))
+		iter.ReportError("ReadObjectCB", `expect " after }, but found `+string([]byte{c}))
 		return false
 	}
 	if c == 'n' {
 		iter.skipThreeBytes('u', 'l', 'l')
 		return true // null
 	}
-	iter.ReportError("ReadObjectCB", `expect { or n, but found ` + string([]byte{c}))
+	iter.ReportError("ReadObjectCB", `expect { or n, but found `+string([]byte{c}))
 	return false
 }
 
@@ -125,7 +125,7 @@ func (iter *Iterator) ReadMapCB(callback func(*Iterator, string) bool) bool {
 			iter.unreadByte()
 			field := iter.ReadString()
 			if iter.nextToken() != ':' {
-				iter.ReportError("ReadMapCB", "expect : after object field, but found " + string([]byte{c}))
+				iter.ReportError("ReadMapCB", "expect : after object field, but found "+string([]byte{c}))
 				return false
 			}
 			if !callback(iter, field) {
@@ -135,7 +135,7 @@ func (iter *Iterator) ReadMapCB(callback func(*Iterator, string) bool) bool {
 			for c == ',' {
 				field = iter.ReadString()
 				if iter.nextToken() != ':' {
-					iter.ReportError("ReadMapCB", "expect : after object field, but found " + string([]byte{c}))
+					iter.ReportError("ReadMapCB", "expect : after object field, but found "+string([]byte{c}))
 					return false
 				}
 				if !callback(iter, field) {
@@ -152,14 +152,14 @@ func (iter *Iterator) ReadMapCB(callback func(*Iterator, string) bool) bool {
 		if c == '}' {
 			return true
 		}
-		iter.ReportError("ReadMapCB", `expect " after }, but found ` + string([]byte{c}))
+		iter.ReportError("ReadMapCB", `expect " after }, but found `+string([]byte{c}))
 		return false
 	}
 	if c == 'n' {
 		iter.skipThreeBytes('u', 'l', 'l')
 		return true // null
 	}
-	iter.ReportError("ReadMapCB", `expect { or n, but found ` + string([]byte{c}))
+	iter.ReportError("ReadMapCB", `expect { or n, but found `+string([]byte{c}))
 	return false
 }
 
@@ -176,7 +176,7 @@ func (iter *Iterator) readObjectStart() bool {
 		iter.skipThreeBytes('u', 'l', 'l')
 		return false
 	}
-	iter.ReportError("readObjectStart", "expect { or n, but found " + string([]byte{c}))
+	iter.ReportError("readObjectStart", "expect { or n, but found "+string([]byte{c}))
 	return false
 }
 
@@ -192,7 +192,7 @@ func (iter *Iterator) readObjectFieldAsBytes() (ret []byte) {
 		}
 	}
 	if iter.buf[iter.head] != ':' {
-		iter.ReportError("readObjectFieldAsBytes", "expect : after object field, but found " + string([]byte{iter.buf[iter.head]}))
+		iter.ReportError("readObjectFieldAsBytes", "expect : after object field, but found "+string([]byte{iter.buf[iter.head]}))
 		return
 	}
 	iter.head++

feature_iter_skip.go

@@ -25,7 +25,7 @@ func (iter *Iterator) ReadBool() (ret bool) {
 		iter.skipFourBytes('a', 'l', 's', 'e')
 		return false
 	}
-	iter.ReportError("ReadBool", "expect t or f, but found " + string([]byte{c}))
+	iter.ReportError("ReadBool", "expect t or f, but found "+string([]byte{c}))
 	return
 }
 

feature_iter_string.go

@@ -28,7 +28,7 @@ func (iter *Iterator) ReadString() (ret string) {
 		iter.skipThreeBytes('u', 'l', 'l')
 		return ""
 	}
-	iter.ReportError("ReadString", `expects " or n, but found ` + string([]byte{c}))
+	iter.ReportError("ReadString", `expects " or n, but found `+string([]byte{c}))
 	return
 }
 
@@ -139,7 +139,7 @@ func (iter *Iterator) ReadStringAsSlice() (ret []byte) {
 		}
 		return copied
 	}
-	iter.ReportError("ReadStringAsSlice", `expects " or n, but found ` + string([]byte{c}))
+	iter.ReportError("ReadStringAsSlice", `expects " or n, but found `+string([]byte{c}))
 	return
 }
 
@@ -156,7 +156,7 @@ func (iter *Iterator) readU4() (ret rune) {
 		} else if c >= 'A' && c <= 'F' {
 			ret = ret*16 + rune(c-'A'+10)
 		} else {
-			iter.ReportError("readU4", "expects 0~9 or a~f, but found " + string([]byte{c}))
+			iter.ReportError("readU4", "expects 0~9 or a~f, but found "+string([]byte{c}))
 			return
 		}
 	}

feature_reflect_native.go

@@ -608,7 +608,7 @@ type stringModeNumberDecoder struct {
 func (decoder *stringModeNumberDecoder) Decode(ptr unsafe.Pointer, iter *Iterator) {
 	c := iter.nextToken()
 	if c != '"' {
-		iter.ReportError("stringModeNumberDecoder", `expect ", but found ` + string([]byte{c}))
+		iter.ReportError("stringModeNumberDecoder", `expect ", but found `+string([]byte{c}))
 		return
 	}
 	decoder.elemDecoder.Decode(ptr, iter)
@@ -617,7 +617,7 @@ func (decoder *stringModeNumberDecoder) Decode(ptr unsafe.Pointer, iter *Iterato
 	}
 	c = iter.readByte()
 	if c != '"' {
-		iter.ReportError("stringModeNumberDecoder", `expect ", but found ` + string([]byte{c}))
+		iter.ReportError("stringModeNumberDecoder", `expect ", but found `+string([]byte{c}))
 		return
 	}
 }

jsoniter_invalid_test.go

@@ -130,3 +130,9 @@ func Test_invalid_number(t *testing.T) {
 	should.Nil(err)
 	should.Equal(string(result2), string(result))
 }
+
+func Test_valid(t *testing.T) {
+	should := require.New(t)
+	should.True(Valid([]byte(`{}`)))
+	should.False(Valid([]byte(`{`)))
+}