/
jsonwriter.go
96 lines (83 loc) · 1.84 KB
/
jsonwriter.go
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package main
import (
"bytes"
"encoding/json"
"strconv"
"strings"
)
type JsonWritable interface {
ToJson() []byte
}
type JsonWriter struct {
buffer bytes.Buffer
needSeparator []bool
}
func (w *JsonWriter) writeIdent(name string) *JsonWriter {
w.buffer.WriteByte('"')
w.buffer.WriteString(name)
w.buffer.WriteString("\":")
return w
}
func (w *JsonWriter) checkSeperator() {
if len(w.needSeparator) > 0 {
if w.needSeparator[len(w.needSeparator)-1] {
w.buffer.WriteByte(',')
} else {
w.needSeparator[len(w.needSeparator)-1] = true
}
}
}
func (w *JsonWriter) StartObj(name string) *JsonWriter {
w.checkSeperator()
if name != "" {
w.writeIdent(name)
}
w.buffer.WriteByte('{')
w.needSeparator = append(w.needSeparator, false)
return w
}
func (w *JsonWriter) StartArray(name string) *JsonWriter {
w.checkSeperator()
if name != "" {
w.writeIdent(name)
}
w.buffer.WriteByte('[')
w.needSeparator = append(w.needSeparator, false)
return w
}
func (w *JsonWriter) WriteStr(name, val string) *JsonWriter {
w.checkSeperator()
val = strings.Replace(val, "\"", "\\\"", -1)
w.writeIdent(name)
w.buffer.WriteByte('"')
json.HTMLEscape(&w.buffer, []byte(val))
w.buffer.WriteByte('"')
return w
}
func (w *JsonWriter) WriteInt(name string, val int) *JsonWriter {
w.checkSeperator()
w.writeIdent(name)
w.buffer.WriteString(strconv.Itoa(val))
return w
}
func (w *JsonWriter) EndArray() *JsonWriter {
w.buffer.WriteByte(']')
w.needSeparator = w.needSeparator[1:]
return w
}
func (w *JsonWriter) EndObj() *JsonWriter {
w.buffer.WriteByte('}')
w.needSeparator = w.needSeparator[1:]
return w
}
func (w *JsonWriter) Write(name string, obj JsonWritable) *JsonWriter {
w.checkSeperator()
if name != "" {
w.writeIdent(name)
}
w.buffer.Write(obj.ToJson())
return w
}
func (w *JsonWriter) Flush() []byte {
return w.buffer.Bytes()
}