mirror of
https://github.com/golang/go
synced 2024-11-22 02:04:40 -07:00
json: delete obsolete code
R=r CC=golang-dev https://golang.org/cl/943047
This commit is contained in:
Russ Cox
parent
dcff89057b
commit
dc644b8f43
@ -8,9 +8,7 @@ TARG=json
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GOFILES=\
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decode.go\
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encode.go\
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error.go\
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indent.go\
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parse.go\
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scanner.go\
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stream.go\
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@ -1,19 +0,0 @@
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package json
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import "fmt"
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// ParseError aggregates information about a JSON parse error. It is
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// compatible with the os.Error interface.
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type ParseError struct {
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Index int // A byte index in JSON string where the error occurred
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Token string // An offending token
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}
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// Produce a string representation of this ParseError.
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func (pe *ParseError) String() string {
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return fmt.Sprintf("Unexpected JSON token at position %d: %q.", pe.Index, pe.Token)
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}
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@ -1,431 +0,0 @@
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// JSON (JavaScript Object Notation) parser.
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// See http://www.json.org/
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// The json package implements a simple parser and
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// representation for JSON (JavaScript Object Notation),
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// as defined at http://www.json.org/.
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package json
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import (
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"bytes"
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"strconv"
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"utf8"
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)
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// Strings
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//
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// Double quoted with escapes: \" \\ \/ \b \f \n \r \t \uXXXX.
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// No literal control characters, supposedly.
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// Have also seen \' and embedded newlines.
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func _UnHex(p string, r, l int) (v int, ok bool) {
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v = 0
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for i := r; i < l; i++ {
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if i >= len(p) {
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return 0, false
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}
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v *= 16
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switch {
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case '0' <= p[i] && p[i] <= '9':
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v += int(p[i] - '0')
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case 'a' <= p[i] && p[i] <= 'f':
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v += int(p[i] - 'a' + 10)
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case 'A' <= p[i] && p[i] <= 'F':
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v += int(p[i] - 'A' + 10)
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default:
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return 0, false
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}
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}
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return v, true
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}
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func _ToHex(b []byte, rune int) {
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const hexDigits = "0123456789abcdef"
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b[0] = hexDigits[rune>>12&0xf]
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b[1] = hexDigits[rune>>8&0xf]
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b[2] = hexDigits[rune>>4&0xf]
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b[3] = hexDigits[rune&0xf]
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}
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// Unquote unquotes the JSON-quoted string s,
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// returning a raw string t. If s is not a valid
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// JSON-quoted string, Unquote returns with ok set to false.
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func Unquote(s string) (t string, ok bool) {
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if len(s) < 2 || s[0] != '"' || s[len(s)-1] != '"' {
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return
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}
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b := make([]byte, len(s))
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w := 0
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for r := 1; r < len(s)-1; {
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switch {
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case s[r] == '\\':
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r++
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if r >= len(s)-1 {
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return
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}
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switch s[r] {
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default:
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return
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case '"', '\\', '/', '\'':
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b[w] = s[r]
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r++
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w++
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case 'b':
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b[w] = '\b'
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r++
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w++
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case 'f':
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b[w] = '\f'
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r++
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w++
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case 'n':
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b[w] = '\n'
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r++
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w++
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case 'r':
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b[w] = '\r'
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r++
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w++
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case 't':
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b[w] = '\t'
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r++
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w++
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case 'u':
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r++
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rune, ok := _UnHex(s, r, r+4)
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if !ok {
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return
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}
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r += 4
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w += utf8.EncodeRune(rune, b[w:])
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}
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// Control characters are invalid, but we've seen raw \n.
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case s[r] < ' ' && s[r] != '\n':
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if s[r] == '\n' {
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b[w] = '\n'
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r++
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w++
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break
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}
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return
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// ASCII
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case s[r] < utf8.RuneSelf:
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b[w] = s[r]
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r++
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w++
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// Coerce to well-formed UTF-8.
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default:
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rune, size := utf8.DecodeRuneInString(s[r:])
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r += size
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w += utf8.EncodeRune(rune, b[w:])
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}
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}
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return string(b[0:w]), true
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}
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// Quote quotes the raw string s using JSON syntax,
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// so that Unquote(Quote(s)) = s, true.
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func Quote(s string) string {
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chr := make([]byte, 6)
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chr0 := chr[0:1]
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b := new(bytes.Buffer)
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chr[0] = '"'
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b.Write(chr0)
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for _, rune := range s {
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switch {
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case rune == '"' || rune == '\\':
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chr[0] = '\\'
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chr[1] = byte(rune)
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b.Write(chr[0:2])
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case rune == '\b':
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chr[0] = '\\'
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chr[1] = 'b'
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b.Write(chr[0:2])
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case rune == '\f':
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chr[0] = '\\'
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chr[1] = 'f'
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b.Write(chr[0:2])
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case rune == '\n':
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chr[0] = '\\'
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chr[1] = 'n'
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b.Write(chr[0:2])
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case rune == '\r':
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chr[0] = '\\'
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chr[1] = 'r'
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b.Write(chr[0:2])
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case rune == '\t':
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chr[0] = '\\'
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chr[1] = 't'
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b.Write(chr[0:2])
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case 0x20 <= rune && rune < utf8.RuneSelf:
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chr[0] = byte(rune)
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b.Write(chr0)
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default:
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chr[0] = '\\'
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chr[1] = 'u'
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_ToHex(chr[2:6], rune)
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b.Write(chr)
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}
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}
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chr[0] = '"'
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b.Write(chr0)
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return b.String()
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}
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// _Lexer
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type _Lexer struct {
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s string
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i int
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kind int
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token string
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}
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func punct(c byte) bool {
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return c == '"' || c == '[' || c == ']' || c == ':' || c == '{' || c == '}' || c == ','
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}
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func white(c byte) bool { return c == ' ' || c == '\t' || c == '\r' || c == '\n' || c == '\v' }
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func skipwhite(p string, i int) int {
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for i < len(p) && white(p[i]) {
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i++
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}
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return i
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}
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func skiptoken(p string, i int) int {
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for i < len(p) && !punct(p[i]) && !white(p[i]) {
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i++
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}
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return i
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}
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func skipstring(p string, i int) int {
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for i++; i < len(p) && p[i] != '"'; i++ {
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if p[i] == '\\' {
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i++
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}
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}
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if i >= len(p) {
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return i
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}
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return i + 1
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}
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func (t *_Lexer) Next() {
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i, s := t.i, t.s
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i = skipwhite(s, i)
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if i >= len(s) {
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t.kind = 0
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t.token = ""
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t.i = len(s)
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return
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}
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c := s[i]
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switch {
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case c == '-' || '0' <= c && c <= '9':
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j := skiptoken(s, i)
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t.kind = '1'
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t.token = s[i:j]
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i = j
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case 'a' <= c && c <= 'z' || 'A' <= c && c <= 'Z':
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j := skiptoken(s, i)
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t.kind = 'a'
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t.token = s[i:j]
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i = j
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case c == '"':
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j := skipstring(s, i)
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t.kind = '"'
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t.token = s[i:j]
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i = j
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case c == '[', c == ']', c == ':', c == '{', c == '}', c == ',':
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t.kind = int(c)
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t.token = s[i : i+1]
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i++
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default:
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t.kind = '?'
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t.token = s[i : i+1]
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}
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t.i = i
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}
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// Parser
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//
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// Implements parsing but not the actions. Those are
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// carried out by the implementation of the Builder interface.
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// A Builder represents the object being created.
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// Calling a method like Int64(i) sets that object to i.
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// Calling a method like Elem(i) or Key(s) creates a
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// new builder for a subpiece of the object (logically,
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// an array element or a map key).
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//
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// There are two Builders, in other files.
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// The JsonBuilder builds a generic Json structure
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// in which maps are maps.
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// The StructBuilder copies data into a possibly
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// nested data structure, using the "map keys"
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// as struct field names.
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type _Value interface{}
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// BUG(rsc): The json Builder interface needs to be
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// reconciled with the xml Builder interface.
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// A Builder is an interface implemented by clients and passed
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// to the JSON parser. It gives clients full control over the
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// eventual representation returned by the parser.
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type Builder interface {
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// Set value
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Int64(i int64)
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Uint64(i uint64)
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Float64(f float64)
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String(s string)
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Bool(b bool)
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Null()
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Array()
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Map()
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// Create sub-Builders
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Elem(i int) Builder
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Key(s string) Builder
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// Flush changes to parent Builder if necessary.
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Flush()
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}
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func parse(lex *_Lexer, build Builder) bool {
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ok := false
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Switch:
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switch lex.kind {
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case 0:
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break
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case '1':
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// If the number is exactly an integer, use that.
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if i, err := strconv.Atoi64(lex.token); err == nil {
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build.Int64(i)
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ok = true
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} else if i, err := strconv.Atoui64(lex.token); err == nil {
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build.Uint64(i)
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ok = true
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} else
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// Fall back to floating point.
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if f, err := strconv.Atof64(lex.token); err == nil {
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build.Float64(f)
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ok = true
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}
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case 'a':
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switch lex.token {
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case "true":
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build.Bool(true)
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ok = true
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case "false":
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build.Bool(false)
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ok = true
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case "null":
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build.Null()
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ok = true
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}
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case '"':
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if str, ok1 := Unquote(lex.token); ok1 {
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build.String(str)
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ok = true
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}
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case '[':
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// array
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build.Array()
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lex.Next()
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n := 0
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for lex.kind != ']' {
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if n > 0 {
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if lex.kind != ',' {
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break Switch
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}
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lex.Next()
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}
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if !parse(lex, build.Elem(n)) {
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break Switch
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}
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n++
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}
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ok = true
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case '{':
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// map
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lex.Next()
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build.Map()
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n := 0
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for lex.kind != '}' {
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if n > 0 {
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if lex.kind != ',' {
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break Switch
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}
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lex.Next()
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}
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if lex.kind != '"' {
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break Switch
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}
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key, ok := Unquote(lex.token)
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if !ok {
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break Switch
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}
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lex.Next()
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if lex.kind != ':' {
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break Switch
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}
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lex.Next()
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if !parse(lex, build.Key(key)) {
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break Switch
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}
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n++
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}
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ok = true
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}
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if ok {
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lex.Next()
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}
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build.Flush()
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return ok
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}
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// Parse parses the JSON syntax string s and makes calls to
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// the builder to construct a parsed representation.
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// On success, it returns with ok set to true.
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// On error, it returns with ok set to false, errindx set
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// to the byte index in s where a syntax error occurred,
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// and errtok set to the offending token.
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func Parse(s string, builder Builder) (ok bool, errindx int, errtok string) {
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lex := new(_Lexer)
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lex.s = s
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lex.Next()
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if parse(lex, builder) {
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if lex.kind == 0 { // EOF
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return true, 0, ""
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}
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}
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return false, lex.i, lex.token
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}
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Block a user