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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Marshalling and unmarshalling of
// JSON data into Go structs using reflection.
package json
import (
"reflect";
"strings";
)
type _StructBuilder struct {
val reflect.Value
}
var nobuilder *_StructBuilder
func isfloat(v reflect.Value) bool {
switch v := v.(type) {
case *reflect.FloatValue:
return true;
case *reflect.Float32Value:
return true;
case *reflect.Float64Value:
return true;
}
return false;
}
func setfloat(v reflect.Value, f float64) {
switch v := v.(type) {
case *reflect.FloatValue:
v.Set(float(f));
case *reflect.Float32Value:
v.Set(float32(f));
case *reflect.Float64Value:
v.Set(float64(f));
}
}
func setint(v reflect.Value, i int64) {
switch v := v.(type) {
case *reflect.IntValue:
v.Set(int(i));
case *reflect.Int8Value:
v.Set(int8(i));
case *reflect.Int16Value:
v.Set(int16(i));
case *reflect.Int32Value:
v.Set(int32(i));
case *reflect.Int64Value:
v.Set(int64(i));
case *reflect.UintValue:
v.Set(uint(i));
case *reflect.Uint8Value:
v.Set(uint8(i));
case *reflect.Uint16Value:
v.Set(uint16(i));
case *reflect.Uint32Value:
v.Set(uint32(i));
case *reflect.Uint64Value:
v.Set(uint64(i));
}
}
func (b *_StructBuilder) Int64(i int64) {
if b == nil {
return
}
v := b.val;
if isfloat(v) {
setfloat(v, float64(i));
} else {
setint(v, i);
}
}
func (b *_StructBuilder) Uint64(i uint64) {
if b == nil {
return
}
v := b.val;
if isfloat(v) {
setfloat(v, float64(i));
} else {
setint(v, int64(i));
}
}
func (b *_StructBuilder) Float64(f float64) {
if b == nil {
return
}
v := b.val;
if isfloat(v) {
setfloat(v, f);
} else {
setint(v, int64(f));
}
}
func (b *_StructBuilder) Null() {
}
func (b *_StructBuilder) String(s string) {
if b == nil {
return
}
if v, ok := b.val.(*reflect.StringValue); ok {
v.Set(s);
}
}
func (b *_StructBuilder) Bool(tf bool) {
if b == nil {
return
}
if v, ok := b.val.(*reflect.BoolValue); ok {
v.Set(tf);
}
}
func (b *_StructBuilder) Array() {
if b == nil {
return
}
if v, ok := b.val.(*reflect.SliceValue); ok {
if v.IsNil() {
v.Set(reflect.MakeSlice(v.Type().(*reflect.SliceType), 0, 8));
}
}
}
func (b *_StructBuilder) Elem(i int) Builder {
if b == nil || i < 0 {
return nobuilder
}
switch v := b.val.(type) {
case *reflect.ArrayValue:
if i < v.Len() {
return &_StructBuilder{ v.Elem(i) }
}
case *reflect.SliceValue:
if i > v.Cap() {
n := v.Cap();
if n < 8 {
n = 8
}
for n <= i {
n *= 2
}
nv := reflect.MakeSlice(v.Type().(*reflect.SliceType), v.Len(), n);
reflect.ArrayCopy(nv, v);
v.Set(nv);
}
if v.Len() <= i && i < v.Cap() {
v.SetLen(i+1);
}
if i < v.Len() {
return &_StructBuilder{ v.Elem(i) }
}
}
return nobuilder;
}
func (b *_StructBuilder) Map() {
if b == nil {
return
}
if v, ok := b.val.(*reflect.PtrValue); ok {
if v.IsNil() {
v.PointTo(reflect.MakeZero(v.Type().(*reflect.PtrType).Elem()))
}
}
}
func (b *_StructBuilder) Key(k string) Builder {
if b == nil {
return nobuilder
}
if v, ok := reflect.Indirect(b.val).(*reflect.StructValue); ok {
t := v.Type().(*reflect.StructType);
if field, ok := t.FieldByName(k); ok {
return &_StructBuilder{ v.FieldByIndex(field.Index) }
}
// Again, case-insensitive.
for i := 0; i < t.NumField(); i++ {
if strings.LowerASCII(t.Field(i).Name) == k {
return &_StructBuilder{ v.Field(i) }
}
}
}
return nobuilder
}
// Unmarshal parses the JSON syntax string s and fills in
// an arbitrary struct or array pointed at by val.
// It uses the reflection library to assign to fields
// and arrays embedded in val. Well-formed data that does not fit
// into the struct is discarded.
//
// For example, given the following definitions:
//
// type Email struct {
// where string;
// addr string;
// }
//
// type Result struct {
// name string;
// phone string;
// emails []Email
// }
//
// var r = Result{ "name", "phone", nil }
//
// unmarshalling the JSON syntax string
//
// {
// "email": [
// {
// "where": "home",
// "addr": "gre@example.com"
// },
// {
// "where": "work",
// "addr": "gre@work.com"
// }
// ],
// "name": "Grace R. Emlin",
// "address": "123 Main Street"
// }
//
// via Unmarshal(s, &r) is equivalent to assigning
//
// r = Result{
// "Grace R. Emlin", // name
// "phone", // no phone given
// []Email{
// Email{ "home", "gre@example.com" },
// Email{ "work", "gre@work.com" }
// }
// }
//
// Note that the field r.phone has not been modified and
// that the JSON field "address" was discarded.
//
// On success, Unmarshal returns with ok set to true.
// On a syntax error, it returns with ok set to false and errtok
// set to the offending token.
func Unmarshal(s string, val interface{}) (ok bool, errtok string) {
var errindx int;
var val1 interface{};
b := &_StructBuilder{ reflect.NewValue(val) };
ok, errindx, errtok = Parse(s, b);
if !ok {
return false, errtok
}
return true, ""
}
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