mirror of
https://github.com/json-iterator/go.git
synced 2024-11-27 08:30:57 +02:00
894 lines
17 KiB
Go
894 lines
17 KiB
Go
package jsoniter
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import (
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"io"
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"fmt"
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"unicode/utf16"
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"strconv"
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"unsafe"
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"encoding/base64"
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)
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type ValueType int
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const (
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Invalid ValueType = iota
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String
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Number
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Null
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Bool
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Array
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Object
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)
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var digits []byte
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var valueTypes []ValueType
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func init() {
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digits = make([]byte, 256)
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for i := 0; i < len(digits); i++ {
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digits[i] = 255
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}
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for i := '0'; i <= '9'; i++ {
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digits[i] = byte(i - '0');
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}
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for i := 'a'; i <= 'f'; i++ {
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digits[i] = byte((i - 'a') + 10);
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}
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for i := 'A'; i <= 'F'; i++ {
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digits[i] = byte((i - 'A') + 10);
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}
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valueTypes = make([]ValueType, 256)
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for i := 0; i < len(valueTypes); i++ {
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valueTypes[i] = Invalid
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}
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valueTypes['"'] = String;
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valueTypes['-'] = Number;
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valueTypes['0'] = Number;
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valueTypes['1'] = Number;
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valueTypes['2'] = Number;
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valueTypes['3'] = Number;
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valueTypes['4'] = Number;
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valueTypes['5'] = Number;
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valueTypes['6'] = Number;
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valueTypes['7'] = Number;
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valueTypes['8'] = Number;
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valueTypes['9'] = Number;
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valueTypes['t'] = Bool;
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valueTypes['f'] = Bool;
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valueTypes['n'] = Null;
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valueTypes['['] = Array;
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valueTypes['{'] = Object;
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}
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type Iterator struct {
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reader io.Reader
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buf []byte
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head int
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tail int
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Error error
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}
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func Parse(reader io.Reader, bufSize int) *Iterator {
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iter := &Iterator{
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reader: reader,
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buf: make([]byte, bufSize),
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head: 0,
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tail: 0,
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}
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return iter
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}
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func ParseBytes(input []byte) *Iterator {
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iter := &Iterator{
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reader: nil,
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buf: input,
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head: 0,
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tail: len(input),
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}
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return iter
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}
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func ParseString(input string) *Iterator {
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return ParseBytes([]byte(input))
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}
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func (iter *Iterator) Reset(reader io.Reader) *Iterator {
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iter.reader = reader
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iter.head = 0
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iter.tail = 0
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return iter
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}
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func (iter *Iterator) ResetBytes(input []byte) *Iterator {
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// only for benchmarking
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iter.reader = nil
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iter.Error = nil
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iter.buf = input
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iter.head = 0
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iter.tail = len(input)
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return iter
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}
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func (iter *Iterator) WhatIsNext() ValueType {
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valueType := valueTypes[iter.readByte()];
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iter.unreadByte();
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return valueType;
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}
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func (iter *Iterator) skipWhitespacesWithoutLoadMore() bool {
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for i := iter.head; i < iter.tail; i++ {
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c := iter.buf[i]
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switch c {
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case ' ', '\n', '\t', '\r':
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continue
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}
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iter.head = i
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return false
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}
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return true
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}
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func (iter *Iterator) nextToken() byte {
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// a variation of skip whitespaces, returning the next non-whitespace token
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for {
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for i := iter.head; i < iter.tail; i++ {
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c := iter.buf[i]
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switch c {
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case ' ', '\n', '\t', '\r':
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continue
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}
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iter.head = i+1
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return c
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}
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if !iter.loadMore() {
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return 0
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}
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}
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}
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func (iter *Iterator) ReportError(operation string, msg string) {
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if iter.Error != nil {
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return
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}
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peekStart := iter.head - 10
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if peekStart < 0 {
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peekStart = 0
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}
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iter.Error = fmt.Errorf("%s: %s, parsing %v ...%s... at %s", operation, msg, iter.head,
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string(iter.buf[peekStart: iter.head]), string(iter.buf[0:iter.tail]))
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}
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func (iter *Iterator) CurrentBuffer() string {
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peekStart := iter.head - 10
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if peekStart < 0 {
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peekStart = 0
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}
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return fmt.Sprintf("parsing %v ...|%s|... at %s", iter.head,
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string(iter.buf[peekStart: iter.head]), string(iter.buf[0:iter.tail]))
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}
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func (iter *Iterator) readByte() (ret byte) {
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if iter.head == iter.tail {
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if iter.loadMore() {
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ret = iter.buf[iter.head]
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iter.head++
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return ret
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} else {
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return 0
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}
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}
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ret = iter.buf[iter.head]
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iter.head++
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return ret
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}
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func (iter *Iterator) loadMore() bool {
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if iter.reader == nil {
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iter.Error = io.EOF
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return false
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}
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for {
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n, err := iter.reader.Read(iter.buf)
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if n == 0 {
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if err != nil {
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iter.Error = err
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return false
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} else {
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// n == 0, err == nil is not EOF
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continue
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}
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} else {
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iter.head = 0
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iter.tail = n
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return true
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}
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}
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}
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func (iter *Iterator) unreadByte() {
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if iter.head == 0 {
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iter.ReportError("unreadByte", "unread too many bytes")
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return
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}
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iter.head -= 1
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return
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}
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const maxUint64 = (1 << 64 - 1)
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const cutoffUint64 = maxUint64 / 10 + 1
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const maxUint32 = (1 << 32 - 1)
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const cutoffUint32 = maxUint32 / 10 + 1
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func (iter *Iterator) ReadUint() (ret uint) {
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val := iter.ReadUint64()
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converted := uint(val)
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if uint64(converted) != val {
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iter.ReportError("ReadUint", "int overflow")
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return
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}
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return converted
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}
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func (iter *Iterator) ReadUint8() (ret uint8) {
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val := iter.ReadUint64()
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converted := uint8(val)
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if uint64(converted) != val {
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iter.ReportError("ReadUint8", "int overflow")
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return
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}
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return converted
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}
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func (iter *Iterator) ReadUint16() (ret uint16) {
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val := iter.ReadUint64()
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converted := uint16(val)
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if uint64(converted) != val {
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iter.ReportError("ReadUint16", "int overflow")
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return
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}
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return converted
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}
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func (iter *Iterator) ReadUint32() (ret uint32) {
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val := iter.ReadUint64()
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converted := uint32(val)
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if uint64(converted) != val {
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iter.ReportError("ReadUint32", "int overflow")
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return
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}
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return converted
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}
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func (iter *Iterator) ReadUint64() (ret uint64) {
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c := iter.readByte()
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v := digits[c]
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if v == 0 {
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return 0 // single zero
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}
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if v == 255 {
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iter.ReportError("ReadUint64", "unexpected character")
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return
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}
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for {
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if ret >= cutoffUint64 {
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iter.ReportError("ReadUint64", "overflow")
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return
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}
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ret = ret * 10 + uint64(v)
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c = iter.readByte()
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v = digits[c]
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if v == 255 {
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iter.unreadByte()
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break
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}
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}
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return ret
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}
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func (iter *Iterator) ReadInt() (ret int) {
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val := iter.ReadInt64()
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converted := int(val)
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if int64(converted) != val {
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iter.ReportError("ReadInt", "int overflow")
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return
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}
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return converted
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}
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func (iter *Iterator) ReadInt8() (ret int8) {
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val := iter.ReadInt64()
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converted := int8(val)
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if int64(converted) != val {
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iter.ReportError("ReadInt8", "int overflow")
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return
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}
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return converted
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}
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func (iter *Iterator) ReadInt16() (ret int16) {
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val := iter.ReadInt64()
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converted := int16(val)
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if int64(converted) != val {
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iter.ReportError("ReadInt16", "int overflow")
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return
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}
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return converted
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}
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func (iter *Iterator) ReadInt32() (ret int32) {
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val := iter.ReadInt64()
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converted := int32(val)
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if int64(converted) != val {
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iter.ReportError("ReadInt32", "int overflow")
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return
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}
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return converted
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}
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func (iter *Iterator) ReadInt64() (ret int64) {
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c := iter.readByte()
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if iter.Error != nil {
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return
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}
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/* optional leading minus */
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if c == '-' {
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n := iter.ReadUint64()
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return -int64(n)
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} else {
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iter.unreadByte()
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n := iter.ReadUint64()
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return int64(n)
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}
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}
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func (iter *Iterator) ReadString() (ret string) {
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return string(iter.readStringAsBytes())
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}
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func (iter *Iterator) readStringAsBytes() (ret []byte) {
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c := iter.nextToken()
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if c == 'n' {
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iter.skipUntilBreak()
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return
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}
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if c != '"' {
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iter.ReportError("ReadString", `expects " or n`)
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return
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}
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end := iter.findStringEndWithoutEscape()
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if end != -1 {
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// fast path: reuse the underlying buffer
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ret = iter.buf[iter.head:end-1]
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iter.head = end
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return ret
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}
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str := make([]byte, 0, 8)
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for iter.Error == nil {
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c = iter.readByte()
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if c == '"' {
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return str
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}
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if c == '\\' {
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c = iter.readByte()
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if iter.Error != nil {
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return
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}
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switch c {
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case 'u':
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r := iter.readU4()
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if iter.Error != nil {
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return
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}
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if utf16.IsSurrogate(r) {
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c = iter.readByte()
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if iter.Error != nil {
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return
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}
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if c != '\\' {
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iter.ReportError("ReadString",
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`expects \u after utf16 surrogate, but \ not found`)
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return
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}
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c = iter.readByte()
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if iter.Error != nil {
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return
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}
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if c != 'u' {
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iter.ReportError("ReadString",
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`expects \u after utf16 surrogate, but \u not found`)
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return
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}
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r2 := iter.readU4()
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if iter.Error != nil {
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return
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}
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combined := utf16.DecodeRune(r, r2)
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str = appendRune(str, combined)
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} else {
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str = appendRune(str, r)
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}
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case '"':
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str = append(str, '"')
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case '\\':
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str = append(str, '\\')
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case '/':
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str = append(str, '/')
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case 'b':
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str = append(str, '\b')
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case 'f':
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str = append(str, '\f')
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case 'n':
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str = append(str, '\n')
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case 'r':
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str = append(str, '\r')
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case 't':
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str = append(str, '\t')
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default:
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iter.ReportError("ReadString",
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`invalid escape char after \`)
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return
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}
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} else {
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str = append(str, c)
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}
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}
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return
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}
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func (iter *Iterator) readU4() (ret rune) {
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for i := 0; i < 4; i++ {
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c := iter.readByte()
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if iter.Error != nil {
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return
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}
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if (c >= '0' && c <= '9') {
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if ret >= cutoffUint32 {
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iter.ReportError("readU4", "overflow")
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return
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}
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ret = ret * 16 + rune(c - '0')
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} else if ((c >= 'a' && c <= 'f') ) {
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if ret >= cutoffUint32 {
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iter.ReportError("readU4", "overflow")
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return
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}
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ret = ret * 16 + rune(c - 'a' + 10)
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} else {
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iter.ReportError("readU4", "expects 0~9 or a~f")
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return
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}
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}
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return ret
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}
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const (
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t1 = 0x00 // 0000 0000
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tx = 0x80 // 1000 0000
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t2 = 0xC0 // 1100 0000
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t3 = 0xE0 // 1110 0000
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t4 = 0xF0 // 1111 0000
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t5 = 0xF8 // 1111 1000
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maskx = 0x3F // 0011 1111
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mask2 = 0x1F // 0001 1111
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mask3 = 0x0F // 0000 1111
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mask4 = 0x07 // 0000 0111
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rune1Max = 1 << 7 - 1
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rune2Max = 1 << 11 - 1
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rune3Max = 1 << 16 - 1
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surrogateMin = 0xD800
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surrogateMax = 0xDFFF
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MaxRune = '\U0010FFFF' // Maximum valid Unicode code point.
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RuneError = '\uFFFD' // the "error" Rune or "Unicode replacement character"
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)
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func appendRune(p []byte, r rune) []byte {
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// Negative values are erroneous. Making it unsigned addresses the problem.
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switch i := uint32(r); {
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case i <= rune1Max:
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p = append(p, byte(r))
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return p
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case i <= rune2Max:
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p = append(p, t2 | byte(r >> 6))
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p = append(p, tx | byte(r) & maskx)
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return p
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case i > MaxRune, surrogateMin <= i && i <= surrogateMax:
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r = RuneError
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fallthrough
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case i <= rune3Max:
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p = append(p, t3 | byte(r >> 12))
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p = append(p, tx | byte(r >> 6) & maskx)
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p = append(p, tx | byte(r) & maskx)
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return p
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default:
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p = append(p, t4 | byte(r >> 18))
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p = append(p, tx | byte(r >> 12) & maskx)
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p = append(p, tx | byte(r >> 6) & maskx)
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p = append(p, tx | byte(r) & maskx)
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return p
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}
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}
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func (iter *Iterator) ReadArray() (ret bool) {
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c := iter.nextToken()
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if iter.Error != nil {
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return
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}
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switch c {
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case 'n': {
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iter.skipUntilBreak()
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return false // null
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}
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case '[': {
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c = iter.nextToken()
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if iter.Error != nil {
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return
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}
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if c == ']' {
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return false
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} else {
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iter.unreadByte()
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return true
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}
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}
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case ']': return false
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case ',':
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return true
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default:
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iter.ReportError("ReadArray", "expect [ or , or ] or n")
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return
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}
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}
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func (iter *Iterator) ReadObject() (ret string) {
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c := iter.nextToken()
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if iter.Error != nil {
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return
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}
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switch c {
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case 'n': {
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iter.skipUntilBreak()
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if iter.Error != nil {
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return
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}
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return "" // null
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}
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case '{': {
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c = iter.nextToken()
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if iter.Error != nil {
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return
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}
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switch c {
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case '}':
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return "" // end of object
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case '"':
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iter.unreadByte()
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return iter.readObjectField()
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default:
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iter.ReportError("ReadObject", `expect " after {`)
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return
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}
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}
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case ',':
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return iter.readObjectField()
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case '}':
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return "" // end of object
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default:
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iter.ReportError("ReadObject", `expect { or , or } or n`)
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return
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}
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}
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func (iter *Iterator) readObjectField() (ret string) {
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str := iter.readStringAsBytes()
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if iter.skipWhitespacesWithoutLoadMore() {
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if ret == "" {
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ret = string(str);
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}
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if !iter.loadMore() {
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return
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}
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}
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if iter.buf[iter.head] != ':' {
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iter.ReportError("ReadObject", "expect : after object field")
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return
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}
|
|
iter.head++
|
|
if iter.skipWhitespacesWithoutLoadMore() {
|
|
if ret == "" {
|
|
ret = string(str);
|
|
}
|
|
if !iter.loadMore() {
|
|
return
|
|
}
|
|
}
|
|
if ret == "" {
|
|
return *(*string)(unsafe.Pointer(&str))
|
|
}
|
|
return ret
|
|
}
|
|
|
|
func (iter *Iterator) ReadFloat32() (ret float32) {
|
|
strBuf := [8]byte{}
|
|
str := strBuf[0:0]
|
|
hasMore := true
|
|
for(hasMore) {
|
|
for i := iter.head; i < iter.tail; i++ {
|
|
c := iter.buf[i]
|
|
switch c {
|
|
case '-', '+', '.', 'e', 'E', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
|
|
str = append(str, c)
|
|
continue
|
|
default:
|
|
hasMore = false
|
|
break
|
|
}
|
|
}
|
|
if hasMore {
|
|
if !iter.loadMore() {
|
|
break
|
|
}
|
|
}
|
|
}
|
|
if iter.Error != nil && iter.Error != io.EOF {
|
|
return
|
|
}
|
|
val, err := strconv.ParseFloat(*(*string)(unsafe.Pointer(&str)), 32)
|
|
if err != nil {
|
|
iter.Error = err
|
|
return
|
|
}
|
|
return float32(val)
|
|
}
|
|
|
|
func (iter *Iterator) ReadFloat64() (ret float64) {
|
|
strBuf := [8]byte{}
|
|
str := strBuf[0:0]
|
|
hasMore := true
|
|
for(hasMore) {
|
|
for i := iter.head; i < iter.tail; i++ {
|
|
c := iter.buf[i]
|
|
switch c {
|
|
case '-', '+', '.', 'e', 'E', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
|
|
str = append(str, c)
|
|
continue
|
|
default:
|
|
hasMore = false
|
|
break
|
|
}
|
|
}
|
|
if hasMore {
|
|
if !iter.loadMore() {
|
|
break
|
|
}
|
|
}
|
|
}
|
|
if iter.Error != nil && iter.Error != io.EOF {
|
|
return
|
|
}
|
|
val, err := strconv.ParseFloat(*(*string)(unsafe.Pointer(&str)), 64)
|
|
if err != nil {
|
|
iter.Error = err
|
|
return
|
|
}
|
|
return val
|
|
}
|
|
|
|
func (iter *Iterator) ReadBool() (ret bool) {
|
|
c := iter.readByte()
|
|
if iter.Error != nil {
|
|
return
|
|
}
|
|
switch c {
|
|
case 't':
|
|
iter.skipUntilBreak()
|
|
return true
|
|
case 'f':
|
|
iter.skipUntilBreak()
|
|
return false
|
|
default:
|
|
iter.ReportError("ReadBool", "expect t or f")
|
|
return
|
|
}
|
|
}
|
|
|
|
func (iter *Iterator) ReadBase64() (ret []byte) {
|
|
src := iter.readStringAsBytes()
|
|
if iter.Error != nil {
|
|
return
|
|
}
|
|
b64 := base64.StdEncoding
|
|
ret = make([]byte, b64.DecodedLen(len(src)))
|
|
n, err := b64.Decode(ret, src)
|
|
if err != nil {
|
|
iter.Error = err
|
|
return
|
|
}
|
|
return ret[:n]
|
|
}
|
|
|
|
func (iter *Iterator) ReadNull() (ret bool) {
|
|
c := iter.readByte()
|
|
if c == 'n' {
|
|
iter.skipUntilBreak()
|
|
return true
|
|
}
|
|
iter.unreadByte()
|
|
return false
|
|
}
|
|
|
|
func (iter *Iterator) Skip() {
|
|
c := iter.readByte()
|
|
switch c {
|
|
case '"':
|
|
iter.skipString()
|
|
case '-', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 't', 'f', 'n':
|
|
iter.skipUntilBreak()
|
|
case '[':
|
|
iter.skipArray()
|
|
case '{':
|
|
iter.skipObject()
|
|
default:
|
|
iter.ReportError("Skip", fmt.Sprintf("do not know how to skip: %v", c))
|
|
return
|
|
}
|
|
}
|
|
|
|
func (iter *Iterator) skipString() {
|
|
for {
|
|
end, escaped := iter.findStringEnd()
|
|
if end == -1 {
|
|
if !iter.loadMore() {
|
|
return
|
|
}
|
|
if escaped {
|
|
iter.head = 1 // skip the first char as last char read is \
|
|
}
|
|
} else {
|
|
iter.head = end
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
// adapted from: https://github.com/buger/jsonparser/blob/master/parser.go
|
|
// Tries to find the end of string
|
|
// Support if string contains escaped quote symbols.
|
|
func (iter *Iterator) findStringEnd() (int, bool) {
|
|
escaped := false
|
|
for i := iter.head; i < iter.tail; i++ {
|
|
c := iter.buf[i]
|
|
if c == '"' {
|
|
if !escaped {
|
|
return i + 1, false
|
|
} else {
|
|
j := i - 1
|
|
for {
|
|
if j < iter.head || iter.buf[j] != '\\' {
|
|
// even number of backslashes
|
|
// either end of buffer, or " found
|
|
return i + 1, true
|
|
}
|
|
j--
|
|
if j < iter.head || iter.buf[j] != '\\' {
|
|
// odd number of backslashes
|
|
// it is \" or \\\"
|
|
break
|
|
}
|
|
j--
|
|
}
|
|
}
|
|
} else if c == '\\' {
|
|
escaped = true
|
|
}
|
|
}
|
|
j := iter.tail - 1
|
|
for {
|
|
if j < iter.head || iter.buf[j] != '\\' {
|
|
// even number of backslashes
|
|
// either end of buffer, or " found
|
|
return -1, false // do not end with \
|
|
}
|
|
j--
|
|
if j < iter.head || iter.buf[j] != '\\' {
|
|
// odd number of backslashes
|
|
// it is \" or \\\"
|
|
break
|
|
}
|
|
j--
|
|
|
|
}
|
|
return -1, true // end with \
|
|
}
|
|
|
|
|
|
func (iter *Iterator) findStringEndWithoutEscape() int {
|
|
for i := iter.head; i < iter.tail; i++ {
|
|
c := iter.buf[i]
|
|
if c == '"' {
|
|
return i + 1
|
|
} else if c == '\\' {
|
|
return -1
|
|
}
|
|
}
|
|
return -1
|
|
}
|
|
|
|
func (iter *Iterator) skipArray() {
|
|
level := 1
|
|
for {
|
|
for i := iter.head; i < iter.tail; i++ {
|
|
switch iter.buf[i] {
|
|
case '"': // If inside string, skip it
|
|
iter.head = i + 1
|
|
iter.skipString()
|
|
i = iter.head - 1 // it will be i++ soon
|
|
case '[': // If open symbol, increase level
|
|
level++
|
|
case ']': // If close symbol, increase level
|
|
level--
|
|
|
|
// If we have returned to the original level, we're done
|
|
if level == 0 {
|
|
iter.head = i + 1
|
|
return
|
|
}
|
|
}
|
|
}
|
|
if (!iter.loadMore()) {
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
func (iter *Iterator) skipObject() {
|
|
level := 1
|
|
for {
|
|
for i := iter.head; i < iter.tail; i++ {
|
|
switch iter.buf[i] {
|
|
case '"': // If inside string, skip it
|
|
iter.head = i + 1
|
|
iter.skipString()
|
|
i = iter.head - 1 // it will be i++ soon
|
|
case '{': // If open symbol, increase level
|
|
level++
|
|
case '}': // If close symbol, increase level
|
|
level--
|
|
|
|
// If we have returned to the original level, we're done
|
|
if level == 0 {
|
|
iter.head = i + 1
|
|
return
|
|
}
|
|
}
|
|
}
|
|
if (!iter.loadMore()) {
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
func (iter *Iterator) skipUntilBreak() {
|
|
// true, false, null, number
|
|
for {
|
|
for i := iter.head; i < iter.tail; i++ {
|
|
c := iter.buf[i]
|
|
switch c {
|
|
case ' ', '\n', '\r', '\t', ',', '}', ']':
|
|
iter.head = i
|
|
return
|
|
}
|
|
}
|
|
if (!iter.loadMore()) {
|
|
return
|
|
}
|
|
}
|
|
}
|