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// Copyright 2012 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.
// Package plist implements parsing of Apple plist files.
package plist
import (
"bytes"
"fmt"
"reflect"
"strconv"
)
func next(data []byte) (skip, tag, rest []byte) {
i := bytes.IndexByte(data, '<')
if i < 0 {
return data, nil, nil
}
j := bytes.IndexByte(data[i:], '>')
if j < 0 {
return data, nil, nil
}
j += i + 1
return data[:i], data[i:j], data[j:]
}
func Unmarshal(data []byte, v interface{}) error {
_, tag, data := next(data)
if !bytes.HasPrefix(tag, []byte("<plist")) {
return fmt.Errorf("not a plist")
}
data, err := unmarshalValue(data, reflect.ValueOf(v))
if err != nil {
return err
}
_, tag, data = next(data)
if !bytes.Equal(tag, []byte("</plist>")) {
return fmt.Errorf("junk on end of plist")
}
return nil
}
func unmarshalValue(data []byte, v reflect.Value) (rest []byte, err error) {
_, tag, data := next(data)
if tag == nil {
return nil, fmt.Errorf("unexpected end of data")
}
if v.Kind() == reflect.Ptr {
if v.IsNil() {
v.Set(reflect.New(v.Type().Elem()))
}
v = v.Elem()
}
switch string(tag) {
case "<dict>":
t := v.Type()
if v.Kind() != reflect.Struct {
return nil, fmt.Errorf("cannot unmarshal <dict> into non-struct %s", v.Type())
}
Dict:
for {
_, tag, data = next(data)
if len(tag) == 0 {
return nil, fmt.Errorf("eof inside <dict>")
}
if string(tag) == "</dict>" {
break
}
if string(tag) != "<key>" {
return nil, fmt.Errorf("unexpected tag %s inside <dict>", tag)
}
var body []byte
body, tag, data = next(data)
if len(tag) == 0 {
return nil, fmt.Errorf("eof inside <dict>")
}
if string(tag) != "</key>" {
return nil, fmt.Errorf("unexpected tag %s inside <dict>", tag)
}
name := string(body)
var i int
for i = 0; i < t.NumField(); i++ {
f := t.Field(i)
if f.Name == name || f.Tag.Get("plist") == name {
data, err = unmarshalValue(data, v.Field(i))
continue Dict
}
}
data, err = skipValue(data)
if err != nil {
return nil, err
}
}
return data, nil
case "<array>":
t := v.Type()
if v.Kind() != reflect.Slice {
return nil, fmt.Errorf("cannot unmarshal <array> into non-slice %s", v.Type())
}
for {
_, tag, rest := next(data)
if len(tag) == 0 {
return nil, fmt.Errorf("eof inside <array>")
}
if string(tag) == "</array>" {
data = rest
break
}
elem := reflect.New(t.Elem()).Elem()
data, err = unmarshalValue(data, elem)
if err != nil {
return nil, err
}
v.Set(reflect.Append(v, elem))
}
return data, nil
case "<string>":
if v.Kind() != reflect.String {
return nil, fmt.Errorf("cannot unmarshal <string> into non-string %s", v.Type())
}
body, etag, data := next(data)
if len(etag) == 0 {
return nil, fmt.Errorf("eof inside <string>")
}
if string(etag) != "</string>" {
return nil, fmt.Errorf("expected </string> but got %s", etag)
}
v.SetString(string(body)) // TODO: unescape
return data, nil
case "<integer>":
if v.Kind() != reflect.Int {
return nil, fmt.Errorf("cannot unmarshal <integer> into non-int %s", v.Type())
}
body, etag, data := next(data)
if len(etag) == 0 {
return nil, fmt.Errorf("eof inside <integer>")
}
if string(etag) != "</integer>" {
return nil, fmt.Errorf("expected </integer> but got %s", etag)
}
i, err := strconv.Atoi(string(body))
if err != nil {
return nil, fmt.Errorf("non-integer in <integer> tag: %s", body)
}
v.SetInt(int64(i))
return data, nil
}
return nil, fmt.Errorf("unexpected tag %s", tag)
}
func skipValue(data []byte) (rest []byte, err error) {
n := 0
for {
var tag []byte
_, tag, data = next(data)
if len(tag) == 0 {
return nil, fmt.Errorf("unexpected eof")
}
if tag[1] == '/' {
if n == 0 {
return nil, fmt.Errorf("unexpected closing tag")
}
n--
if n == 0 {
break
}
} else {
n++
}
}
return data, nil
}
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