mirror of
https://github.com/golang/go
synced 2024-10-05 15:51:22 -06:00
106 lines
2.7 KiB
Go
106 lines
2.7 KiB
Go
// 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.
|
|
|
|
// Represents JSON data structure using native Go types: booleans, floats,
|
|
// strings, arrays, and maps.
|
|
|
|
package json
|
|
|
|
import (
|
|
"container/vector";
|
|
"os";
|
|
)
|
|
|
|
// Decode a JSON string
|
|
|
|
// Decode parses the string s as a JSON-syntax string and returns the
|
|
// generic JSON object representation. The object representation is a tree
|
|
// of Go data types. The data return value may be one of float64, string,
|
|
// bool, nil, []interface{} or map[string]interface{}. The array and map
|
|
// elements may in turn contain any of the types listed above and so on.
|
|
|
|
// If Decode encounters a syntax error, it returns with err set to an
|
|
// instance of ParseError. See ParseError documentation for details.
|
|
func Decode(s string) (data interface{}, err os.Error) {
|
|
jb := newDecoder(nil, nil);
|
|
ok, errPos, errTok := Parse(s, jb);
|
|
if ok {
|
|
data = jb.Data()
|
|
} else {
|
|
err = &ParseError{Index: errPos, Token: errTok}
|
|
}
|
|
return;
|
|
}
|
|
|
|
type decoder struct {
|
|
// A value being constructed.
|
|
value interface{};
|
|
// Container entity to flush into. Can be either vector.Vector or
|
|
// map[string]interface{}.
|
|
container interface{};
|
|
// The index into the container interface. Either int or string.
|
|
index interface{};
|
|
}
|
|
|
|
func newDecoder(container interface{}, key interface{}) *decoder {
|
|
return &decoder{container: container, index: key}
|
|
}
|
|
|
|
func (j *decoder) Int64(i int64) { j.value = float64(i) }
|
|
|
|
func (j *decoder) Uint64(i uint64) { j.value = float64(i) }
|
|
|
|
func (j *decoder) Float64(f float64) { j.value = float64(f) }
|
|
|
|
func (j *decoder) String(s string) { j.value = s }
|
|
|
|
func (j *decoder) Bool(b bool) { j.value = b }
|
|
|
|
func (j *decoder) Null() { j.value = nil }
|
|
|
|
func (j *decoder) Array() { j.value = new(vector.Vector) }
|
|
|
|
func (j *decoder) Map() { j.value = make(map[string]interface{}) }
|
|
|
|
func (j *decoder) Elem(i int) Builder {
|
|
v, ok := j.value.(*vector.Vector);
|
|
if !ok {
|
|
v = new(vector.Vector);
|
|
j.value = v;
|
|
}
|
|
if v.Len() <= i {
|
|
v.Resize(i+1, (i+1)*2)
|
|
}
|
|
return newDecoder(v, i);
|
|
}
|
|
|
|
func (j *decoder) Key(s string) Builder {
|
|
m, ok := j.value.(map[string]interface{});
|
|
if !ok {
|
|
m = make(map[string]interface{});
|
|
j.value = m;
|
|
}
|
|
return newDecoder(m, s);
|
|
}
|
|
|
|
func (j *decoder) Flush() {
|
|
switch c := j.container.(type) {
|
|
case *vector.Vector:
|
|
index := j.index.(int);
|
|
c.Set(index, j.Data());
|
|
case map[string]interface{}:
|
|
index := j.index.(string);
|
|
c[index] = j.Data();
|
|
}
|
|
}
|
|
|
|
// Get the value built by this builder.
|
|
func (j *decoder) Data() interface{} {
|
|
switch v := j.value.(type) {
|
|
case *vector.Vector:
|
|
return v.Data()
|
|
}
|
|
return j.value;
|
|
}
|