forked from mirror/ledisdb
1211 lines
29 KiB
Go
1211 lines
29 KiB
Go
// Copyright (c) 2012-2015 Ugorji Nwoke. All rights reserved.
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// Use of this source code is governed by a MIT license found in the LICENSE file.
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package codec
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// By default, this json support uses base64 encoding for bytes, because you cannot
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// store and read any arbitrary string in json (only unicode).
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// However, the user can configre how to encode/decode bytes.
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//
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// This library specifically supports UTF-8 for encoding and decoding only.
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//
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// Note that the library will happily encode/decode things which are not valid
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// json e.g. a map[int64]string. We do it for consistency. With valid json,
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// we will encode and decode appropriately.
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// Users can specify their map type if necessary to force it.
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//
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// Note:
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// - we cannot use strconv.Quote and strconv.Unquote because json quotes/unquotes differently.
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// We implement it here.
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// - Also, strconv.ParseXXX for floats and integers
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// - only works on strings resulting in unnecessary allocation and []byte-string conversion.
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// - it does a lot of redundant checks, because json numbers are simpler that what it supports.
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// - We parse numbers (floats and integers) directly here.
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// We only delegate parsing floats if it is a hairy float which could cause a loss of precision.
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// In that case, we delegate to strconv.ParseFloat.
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//
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// Note:
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// - encode does not beautify. There is no whitespace when encoding.
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// - rpc calls which take single integer arguments or write single numeric arguments will need care.
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// Top-level methods of json(End|Dec)Driver (which are implementations of (en|de)cDriver
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// MUST not call one-another.
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import (
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"bytes"
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"encoding/base64"
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"reflect"
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"strconv"
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"time"
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"unicode"
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"unicode/utf16"
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"unicode/utf8"
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)
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//--------------------------------
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var jsonLiterals = [...]byte{
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'"',
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't', 'r', 'u', 'e',
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'"',
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'"',
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'f', 'a', 'l', 's', 'e',
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'"',
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'"',
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'n', 'u', 'l', 'l',
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'"',
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}
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const (
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jsonLitTrueQ = 0
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jsonLitTrue = 1
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jsonLitFalseQ = 6
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jsonLitFalse = 7
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jsonLitNullQ = 13
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jsonLitNull = 14
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)
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var (
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// jsonFloat64Pow10 = [...]float64{
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// 1e0, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9,
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// 1e10, 1e11, 1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19,
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// 1e20, 1e21, 1e22,
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// }
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// jsonUint64Pow10 = [...]uint64{
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// 1e0, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9,
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// 1e10, 1e11, 1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19,
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// }
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// jsonTabs and jsonSpaces are used as caches for indents
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jsonTabs, jsonSpaces string
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jsonCharHtmlSafeSet bitset128
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jsonCharSafeSet bitset128
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jsonCharWhitespaceSet bitset256
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jsonNumSet bitset256
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// jsonIsFloatSet bitset256
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jsonU4Set [256]byte
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)
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const (
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// If !jsonValidateSymbols, decoding will be faster, by skipping some checks:
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// - If we see first character of null, false or true,
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// do not validate subsequent characters.
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// - e.g. if we see a n, assume null and skip next 3 characters,
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// and do not validate they are ull.
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// P.S. Do not expect a significant decoding boost from this.
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jsonValidateSymbols = true
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jsonSpacesOrTabsLen = 128
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jsonU4SetErrVal = 128
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jsonAlwaysReturnInternString = false
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)
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func init() {
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var bs [jsonSpacesOrTabsLen]byte
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for i := 0; i < jsonSpacesOrTabsLen; i++ {
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bs[i] = ' '
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}
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jsonSpaces = string(bs[:])
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for i := 0; i < jsonSpacesOrTabsLen; i++ {
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bs[i] = '\t'
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}
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jsonTabs = string(bs[:])
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// populate the safe values as true: note: ASCII control characters are (0-31)
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// jsonCharSafeSet: all true except (0-31) " \
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// jsonCharHtmlSafeSet: all true except (0-31) " \ < > &
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var i byte
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for i = 32; i < utf8.RuneSelf; i++ {
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switch i {
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case '"', '\\':
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case '<', '>', '&':
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jsonCharSafeSet.set(i) // = true
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default:
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jsonCharSafeSet.set(i)
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jsonCharHtmlSafeSet.set(i)
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}
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}
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for i = 0; i <= utf8.RuneSelf; i++ {
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switch i {
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case ' ', '\t', '\r', '\n':
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jsonCharWhitespaceSet.set(i)
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case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'e', 'E', '.', '+', '-':
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jsonNumSet.set(i)
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}
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}
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for j := range jsonU4Set {
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switch i = byte(j); i {
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case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
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jsonU4Set[i] = i - '0'
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case 'a', 'b', 'c', 'd', 'e', 'f':
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jsonU4Set[i] = i - 'a' + 10
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case 'A', 'B', 'C', 'D', 'E', 'F':
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jsonU4Set[i] = i - 'A' + 10
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default:
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jsonU4Set[i] = jsonU4SetErrVal
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}
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// switch i = byte(j); i {
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// case 'e', 'E', '.':
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// jsonIsFloatSet.set(i)
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// }
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}
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// jsonU4Set[255] = jsonU4SetErrVal
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}
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type jsonEncDriver struct {
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e *Encoder
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w encWriter
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h *JsonHandle
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b [64]byte // scratch
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bs []byte // scratch
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se setExtWrapper
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ds string // indent string
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dl uint16 // indent level
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dt bool // indent using tabs
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d bool // indent
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c containerState
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noBuiltInTypes
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}
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// indent is done as below:
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// - newline and indent are added before each mapKey or arrayElem
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// - newline and indent are added before each ending,
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// except there was no entry (so we can have {} or [])
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func (e *jsonEncDriver) WriteArrayStart(length int) {
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if e.d {
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e.dl++
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}
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e.w.writen1('[')
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e.c = containerArrayStart
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}
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func (e *jsonEncDriver) WriteArrayElem() {
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if e.c != containerArrayStart {
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e.w.writen1(',')
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}
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if e.d {
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e.writeIndent()
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}
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e.c = containerArrayElem
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}
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func (e *jsonEncDriver) WriteArrayEnd() {
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if e.d {
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e.dl--
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if e.c != containerArrayStart {
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e.writeIndent()
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}
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}
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e.w.writen1(']')
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e.c = containerArrayEnd
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}
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func (e *jsonEncDriver) WriteMapStart(length int) {
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if e.d {
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e.dl++
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}
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e.w.writen1('{')
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e.c = containerMapStart
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}
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func (e *jsonEncDriver) WriteMapElemKey() {
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if e.c != containerMapStart {
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e.w.writen1(',')
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}
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if e.d {
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e.writeIndent()
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}
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e.c = containerMapKey
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}
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func (e *jsonEncDriver) WriteMapElemValue() {
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if e.d {
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e.w.writen2(':', ' ')
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} else {
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e.w.writen1(':')
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}
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e.c = containerMapValue
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}
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func (e *jsonEncDriver) WriteMapEnd() {
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if e.d {
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e.dl--
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if e.c != containerMapStart {
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e.writeIndent()
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}
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}
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e.w.writen1('}')
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e.c = containerMapEnd
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}
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func (e *jsonEncDriver) writeIndent() {
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e.w.writen1('\n')
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if x := len(e.ds) * int(e.dl); x <= jsonSpacesOrTabsLen {
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if e.dt {
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e.w.writestr(jsonTabs[:x])
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} else {
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e.w.writestr(jsonSpaces[:x])
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}
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} else {
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for i := uint16(0); i < e.dl; i++ {
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e.w.writestr(e.ds)
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}
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}
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}
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func (e *jsonEncDriver) EncodeNil() {
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// We always encode nil as just null (never in quotes)
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// This allows us to easily decode if a nil in the json stream
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// ie if initial token is n.
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e.w.writeb(jsonLiterals[jsonLitNull : jsonLitNull+4])
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// if e.h.MapKeyAsString && e.c == containerMapKey {
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// e.w.writeb(jsonLiterals[jsonLitNullQ : jsonLitNullQ+6])
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// } else {
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// e.w.writeb(jsonLiterals[jsonLitNull : jsonLitNull+4])
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// }
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}
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func (e *jsonEncDriver) EncodeTime(t time.Time) {
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// Do NOT use MarshalJSON, as it allocates internally.
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// instead, we call AppendFormat directly, using our scratch buffer (e.b)
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if t.IsZero() {
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e.EncodeNil()
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} else {
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e.b[0] = '"'
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b := t.AppendFormat(e.b[1:1], time.RFC3339Nano)
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e.b[len(b)+1] = '"'
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e.w.writeb(e.b[:len(b)+2])
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}
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// fmt.Printf(">>>> time as a string: '%s'\n", e.b[:len(b)+2])
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// v, err := t.MarshalJSON(); if err != nil { e.e.error(err) } e.w.writeb(v)
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}
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func (e *jsonEncDriver) EncodeBool(b bool) {
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if e.h.MapKeyAsString && e.c == containerMapKey {
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if b {
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e.w.writeb(jsonLiterals[jsonLitTrueQ : jsonLitTrueQ+6])
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} else {
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e.w.writeb(jsonLiterals[jsonLitFalseQ : jsonLitFalseQ+7])
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}
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} else {
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if b {
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e.w.writeb(jsonLiterals[jsonLitTrue : jsonLitTrue+4])
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} else {
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e.w.writeb(jsonLiterals[jsonLitFalse : jsonLitFalse+5])
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}
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}
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}
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func (e *jsonEncDriver) EncodeFloat32(f float32) {
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e.encodeFloat(float64(f), 32)
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}
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func (e *jsonEncDriver) EncodeFloat64(f float64) {
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e.encodeFloat(f, 64)
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}
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func (e *jsonEncDriver) encodeFloat(f float64, numbits int) {
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var blen int
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var x []byte
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if e.h.MapKeyAsString && e.c == containerMapKey {
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e.b[0] = '"'
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x = strconv.AppendFloat(e.b[1:1], f, 'G', -1, numbits)
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blen = 1 + len(x)
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if jsonIsFloatBytesB2(x) {
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e.b[blen] = '"'
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blen += 1
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} else {
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e.b[blen] = '.'
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e.b[blen+1] = '0'
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e.b[blen+2] = '"'
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blen += 3
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}
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} else {
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x = strconv.AppendFloat(e.b[:0], f, 'G', -1, numbits)
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blen = len(x)
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if !jsonIsFloatBytesB2(x) {
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e.b[blen] = '.'
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e.b[blen+1] = '0'
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blen += 2
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}
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}
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e.w.writeb(e.b[:blen])
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}
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func (e *jsonEncDriver) EncodeInt(v int64) {
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x := e.h.IntegerAsString
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if x == 'A' || x == 'L' && (v > 1<<53 || v < -(1<<53)) || (e.h.MapKeyAsString && e.c == containerMapKey) {
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blen := 2 + len(strconv.AppendInt(e.b[1:1], v, 10))
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e.b[0] = '"'
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e.b[blen-1] = '"'
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e.w.writeb(e.b[:blen])
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return
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}
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e.w.writeb(strconv.AppendInt(e.b[:0], v, 10))
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}
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func (e *jsonEncDriver) EncodeUint(v uint64) {
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x := e.h.IntegerAsString
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if x == 'A' || x == 'L' && v > 1<<53 || (e.h.MapKeyAsString && e.c == containerMapKey) {
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blen := 2 + len(strconv.AppendUint(e.b[1:1], v, 10))
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e.b[0] = '"'
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e.b[blen-1] = '"'
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e.w.writeb(e.b[:blen])
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return
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}
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e.w.writeb(strconv.AppendUint(e.b[:0], v, 10))
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}
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func (e *jsonEncDriver) EncodeExt(rv interface{}, xtag uint64, ext Ext, en *Encoder) {
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if v := ext.ConvertExt(rv); v == nil {
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e.EncodeNil()
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} else {
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en.encode(v)
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}
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}
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func (e *jsonEncDriver) EncodeRawExt(re *RawExt, en *Encoder) {
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// only encodes re.Value (never re.Data)
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if re.Value == nil {
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e.EncodeNil()
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} else {
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en.encode(re.Value)
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}
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}
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func (e *jsonEncDriver) EncodeString(c charEncoding, v string) {
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e.quoteStr(v)
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}
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func (e *jsonEncDriver) EncodeSymbol(v string) {
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e.quoteStr(v)
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}
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func (e *jsonEncDriver) EncodeStringBytes(c charEncoding, v []byte) {
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// if encoding raw bytes and RawBytesExt is configured, use it to encode
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if v == nil {
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e.EncodeNil()
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return
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}
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if c == cRAW {
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if e.se.i != nil {
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e.EncodeExt(v, 0, &e.se, e.e)
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return
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}
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slen := base64.StdEncoding.EncodedLen(len(v))
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if cap(e.bs) >= slen {
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e.bs = e.bs[:slen]
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} else {
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e.bs = make([]byte, slen)
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}
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base64.StdEncoding.Encode(e.bs, v)
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e.w.writen1('"')
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e.w.writeb(e.bs)
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e.w.writen1('"')
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} else {
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e.quoteStr(stringView(v))
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}
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}
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func (e *jsonEncDriver) EncodeAsis(v []byte) {
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e.w.writeb(v)
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}
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func (e *jsonEncDriver) quoteStr(s string) {
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// adapted from std pkg encoding/json
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const hex = "0123456789abcdef"
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w := e.w
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w.writen1('"')
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var start int
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for i, slen := 0, len(s); i < slen; {
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// encode all bytes < 0x20 (except \r, \n).
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// also encode < > & to prevent security holes when served to some browsers.
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if b := s[i]; b < utf8.RuneSelf {
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// if 0x20 <= b && b != '\\' && b != '"' && b != '<' && b != '>' && b != '&' {
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if jsonCharHtmlSafeSet.isset(b) || (e.h.HTMLCharsAsIs && jsonCharSafeSet.isset(b)) {
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i++
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continue
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}
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if start < i {
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w.writestr(s[start:i])
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}
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switch b {
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case '\\', '"':
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w.writen2('\\', b)
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case '\n':
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w.writen2('\\', 'n')
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case '\r':
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w.writen2('\\', 'r')
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case '\b':
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w.writen2('\\', 'b')
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case '\f':
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w.writen2('\\', 'f')
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case '\t':
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w.writen2('\\', 't')
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default:
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w.writestr(`\u00`)
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w.writen2(hex[b>>4], hex[b&0xF])
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}
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i++
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start = i
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continue
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}
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c, size := utf8.DecodeRuneInString(s[i:])
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if c == utf8.RuneError && size == 1 {
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if start < i {
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w.writestr(s[start:i])
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}
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w.writestr(`\ufffd`)
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i += size
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start = i
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continue
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}
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// U+2028 is LINE SEPARATOR. U+2029 is PARAGRAPH SEPARATOR.
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// Both technically valid JSON, but bomb on JSONP, so fix here unconditionally.
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if c == '\u2028' || c == '\u2029' {
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if start < i {
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w.writestr(s[start:i])
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}
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w.writestr(`\u202`)
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w.writen1(hex[c&0xF])
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i += size
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start = i
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continue
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}
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i += size
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}
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if start < len(s) {
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w.writestr(s[start:])
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}
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w.writen1('"')
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}
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func (e *jsonEncDriver) atEndOfEncode() {
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if e.h.TermWhitespace {
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if e.d {
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e.w.writen1('\n')
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} else {
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e.w.writen1(' ')
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}
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}
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}
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|
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type jsonDecDriver struct {
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noBuiltInTypes
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d *Decoder
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h *JsonHandle
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r decReader
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|
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c containerState
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// tok is used to store the token read right after skipWhiteSpace.
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tok uint8
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|
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fnull bool // found null from appendStringAsBytes
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|
|
|
bstr [8]byte // scratch used for string \UXXX parsing
|
|
b [64]byte // scratch, used for parsing strings or numbers or time.Time
|
|
b2 [64]byte // scratch, used only for decodeBytes (after base64)
|
|
bs []byte // scratch. Initialized from b. Used for parsing strings or numbers.
|
|
|
|
se setExtWrapper
|
|
|
|
// n jsonNum
|
|
}
|
|
|
|
func jsonIsWS(b byte) bool {
|
|
// return b == ' ' || b == '\t' || b == '\r' || b == '\n'
|
|
return jsonCharWhitespaceSet.isset(b)
|
|
}
|
|
|
|
func (d *jsonDecDriver) uncacheRead() {
|
|
if d.tok != 0 {
|
|
d.r.unreadn1()
|
|
d.tok = 0
|
|
}
|
|
}
|
|
|
|
func (d *jsonDecDriver) ReadMapStart() int {
|
|
if d.tok == 0 {
|
|
d.tok = d.r.skip(&jsonCharWhitespaceSet)
|
|
}
|
|
if d.tok != '{' {
|
|
d.d.errorf("json: expect char '%c' but got char '%c'", '{', d.tok)
|
|
}
|
|
d.tok = 0
|
|
d.c = containerMapStart
|
|
return -1
|
|
}
|
|
|
|
func (d *jsonDecDriver) ReadArrayStart() int {
|
|
if d.tok == 0 {
|
|
d.tok = d.r.skip(&jsonCharWhitespaceSet)
|
|
}
|
|
if d.tok != '[' {
|
|
d.d.errorf("json: expect char '%c' but got char '%c'", '[', d.tok)
|
|
}
|
|
d.tok = 0
|
|
d.c = containerArrayStart
|
|
return -1
|
|
}
|
|
|
|
func (d *jsonDecDriver) CheckBreak() bool {
|
|
if d.tok == 0 {
|
|
d.tok = d.r.skip(&jsonCharWhitespaceSet)
|
|
}
|
|
return d.tok == '}' || d.tok == ']'
|
|
}
|
|
|
|
func (d *jsonDecDriver) ReadArrayElem() {
|
|
if d.tok == 0 {
|
|
d.tok = d.r.skip(&jsonCharWhitespaceSet)
|
|
}
|
|
if d.c != containerArrayStart {
|
|
const xc uint8 = ','
|
|
if d.tok != xc {
|
|
d.d.errorf("json: expect char '%c' but got char '%c'", xc, d.tok)
|
|
}
|
|
d.tok = 0
|
|
}
|
|
d.c = containerArrayElem
|
|
}
|
|
|
|
func (d *jsonDecDriver) ReadArrayEnd() {
|
|
if d.tok == 0 {
|
|
d.tok = d.r.skip(&jsonCharWhitespaceSet)
|
|
}
|
|
const xc uint8 = ']'
|
|
if d.tok != xc {
|
|
d.d.errorf("json: expect char '%c' but got char '%c'", xc, d.tok)
|
|
}
|
|
d.tok = 0
|
|
d.c = containerArrayEnd
|
|
}
|
|
|
|
func (d *jsonDecDriver) ReadMapElemKey() {
|
|
if d.tok == 0 {
|
|
d.tok = d.r.skip(&jsonCharWhitespaceSet)
|
|
}
|
|
if d.c != containerMapStart {
|
|
const xc uint8 = ','
|
|
if d.tok != xc {
|
|
d.d.errorf("json: expect char '%c' but got char '%c'", xc, d.tok)
|
|
}
|
|
d.tok = 0
|
|
}
|
|
d.c = containerMapKey
|
|
}
|
|
|
|
func (d *jsonDecDriver) ReadMapElemValue() {
|
|
if d.tok == 0 {
|
|
d.tok = d.r.skip(&jsonCharWhitespaceSet)
|
|
}
|
|
const xc uint8 = ':'
|
|
if d.tok != xc {
|
|
d.d.errorf("json: expect char '%c' but got char '%c'", xc, d.tok)
|
|
}
|
|
d.tok = 0
|
|
d.c = containerMapValue
|
|
}
|
|
|
|
func (d *jsonDecDriver) ReadMapEnd() {
|
|
if d.tok == 0 {
|
|
d.tok = d.r.skip(&jsonCharWhitespaceSet)
|
|
}
|
|
const xc uint8 = '}'
|
|
if d.tok != xc {
|
|
d.d.errorf("json: expect char '%c' but got char '%c'", xc, d.tok)
|
|
}
|
|
d.tok = 0
|
|
d.c = containerMapEnd
|
|
}
|
|
|
|
// func (d *jsonDecDriver) readContainerState(c containerState, xc uint8, check bool) {
|
|
// if d.tok == 0 {
|
|
// d.tok = d.r.skip(&jsonCharWhitespaceSet)
|
|
// }
|
|
// if check {
|
|
// if d.tok != xc {
|
|
// d.d.errorf("json: expect char '%c' but got char '%c'", xc, d.tok)
|
|
// }
|
|
// d.tok = 0
|
|
// }
|
|
// d.c = c
|
|
// }
|
|
|
|
func (d *jsonDecDriver) readLit(length, fromIdx uint8) {
|
|
bs := d.r.readx(int(length))
|
|
d.tok = 0
|
|
if jsonValidateSymbols && !bytes.Equal(bs, jsonLiterals[fromIdx:fromIdx+length]) {
|
|
d.d.errorf("json: expecting %s: got %s", jsonLiterals[fromIdx:fromIdx+length], bs)
|
|
return
|
|
}
|
|
}
|
|
|
|
func (d *jsonDecDriver) TryDecodeAsNil() bool {
|
|
if d.tok == 0 {
|
|
d.tok = d.r.skip(&jsonCharWhitespaceSet)
|
|
}
|
|
// TODO: we shouldn't try to see if "null" was here, right?
|
|
// only "null" denotes a nil
|
|
if d.tok == 'n' {
|
|
d.readLit(3, jsonLitNull+1) // (n)ull
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
func (d *jsonDecDriver) DecodeBool() (v bool) {
|
|
if d.tok == 0 {
|
|
d.tok = d.r.skip(&jsonCharWhitespaceSet)
|
|
}
|
|
fquot := d.c == containerMapKey && d.tok == '"'
|
|
if fquot {
|
|
d.tok = d.r.readn1()
|
|
}
|
|
switch d.tok {
|
|
case 'f':
|
|
d.readLit(4, jsonLitFalse+1) // (f)alse
|
|
// v = false
|
|
case 't':
|
|
d.readLit(3, jsonLitTrue+1) // (t)rue
|
|
v = true
|
|
default:
|
|
d.d.errorf("json: decode bool: got first char %c", d.tok)
|
|
// v = false // "unreachable"
|
|
}
|
|
if fquot {
|
|
d.r.readn1()
|
|
}
|
|
return
|
|
}
|
|
|
|
func (d *jsonDecDriver) DecodeTime() (t time.Time) {
|
|
// read string, and pass the string into json.unmarshal
|
|
d.appendStringAsBytes()
|
|
if d.fnull {
|
|
return
|
|
}
|
|
t, err := time.Parse(time.RFC3339, stringView(d.bs))
|
|
if err != nil {
|
|
d.d.error(err)
|
|
}
|
|
return
|
|
}
|
|
|
|
func (d *jsonDecDriver) ContainerType() (vt valueType) {
|
|
// check container type by checking the first char
|
|
if d.tok == 0 {
|
|
d.tok = d.r.skip(&jsonCharWhitespaceSet)
|
|
}
|
|
if b := d.tok; b == '{' {
|
|
return valueTypeMap
|
|
} else if b == '[' {
|
|
return valueTypeArray
|
|
} else if b == 'n' {
|
|
return valueTypeNil
|
|
} else if b == '"' {
|
|
return valueTypeString
|
|
}
|
|
return valueTypeUnset
|
|
// d.d.errorf("isContainerType: unsupported parameter: %v", vt)
|
|
// return false // "unreachable"
|
|
}
|
|
|
|
func (d *jsonDecDriver) decNumBytes() (bs []byte) {
|
|
// stores num bytes in d.bs
|
|
if d.tok == 0 {
|
|
d.tok = d.r.skip(&jsonCharWhitespaceSet)
|
|
}
|
|
if d.tok == '"' {
|
|
bs = d.r.readUntil(d.b2[:0], '"')
|
|
bs = bs[:len(bs)-1]
|
|
} else {
|
|
d.r.unreadn1()
|
|
bs = d.r.readTo(d.bs[:0], &jsonNumSet)
|
|
}
|
|
d.tok = 0
|
|
return bs
|
|
}
|
|
|
|
func (d *jsonDecDriver) DecodeUint(bitsize uint8) (u uint64) {
|
|
bs := d.decNumBytes()
|
|
u, err := strconv.ParseUint(stringView(bs), 10, int(bitsize))
|
|
if err != nil {
|
|
d.d.errorf("json: decode uint from %s: %v", bs, err)
|
|
return
|
|
}
|
|
return
|
|
}
|
|
|
|
func (d *jsonDecDriver) DecodeInt(bitsize uint8) (i int64) {
|
|
bs := d.decNumBytes()
|
|
i, err := strconv.ParseInt(stringView(bs), 10, int(bitsize))
|
|
if err != nil {
|
|
d.d.errorf("json: decode int from %s: %v", bs, err)
|
|
return
|
|
}
|
|
return
|
|
}
|
|
|
|
func (d *jsonDecDriver) DecodeFloat(chkOverflow32 bool) (f float64) {
|
|
bs := d.decNumBytes()
|
|
bitsize := 64
|
|
if chkOverflow32 {
|
|
bitsize = 32
|
|
}
|
|
f, err := strconv.ParseFloat(stringView(bs), bitsize)
|
|
if err != nil {
|
|
d.d.errorf("json: decode float from %s: %v", bs, err)
|
|
return
|
|
}
|
|
return
|
|
}
|
|
|
|
func (d *jsonDecDriver) DecodeExt(rv interface{}, xtag uint64, ext Ext) (realxtag uint64) {
|
|
if ext == nil {
|
|
re := rv.(*RawExt)
|
|
re.Tag = xtag
|
|
d.d.decode(&re.Value)
|
|
} else {
|
|
var v interface{}
|
|
d.d.decode(&v)
|
|
ext.UpdateExt(rv, v)
|
|
}
|
|
return
|
|
}
|
|
|
|
func (d *jsonDecDriver) DecodeBytes(bs []byte, zerocopy bool) (bsOut []byte) {
|
|
// if decoding into raw bytes, and the RawBytesExt is configured, use it to decode.
|
|
if d.se.i != nil {
|
|
bsOut = bs
|
|
d.DecodeExt(&bsOut, 0, &d.se)
|
|
return
|
|
}
|
|
if d.tok == 0 {
|
|
d.tok = d.r.skip(&jsonCharWhitespaceSet)
|
|
}
|
|
// check if an "array" of uint8's (see ContainerType for how to infer if an array)
|
|
if d.tok == '[' {
|
|
bsOut, _ = fastpathTV.DecSliceUint8V(bs, true, d.d)
|
|
return
|
|
}
|
|
d.appendStringAsBytes()
|
|
// base64 encodes []byte{} as "", and we encode nil []byte as null.
|
|
// Consequently, base64 should decode null as a nil []byte, and "" as an empty []byte{}.
|
|
// appendStringAsBytes returns a zero-len slice for both, so as not to reset d.bs.
|
|
// However, it sets a fnull field to true, so we can check if a null was found.
|
|
if len(d.bs) == 0 {
|
|
if d.fnull {
|
|
return nil
|
|
}
|
|
return []byte{}
|
|
}
|
|
bs0 := d.bs
|
|
slen := base64.StdEncoding.DecodedLen(len(bs0))
|
|
if slen <= cap(bs) {
|
|
bsOut = bs[:slen]
|
|
} else if zerocopy && slen <= cap(d.b2) {
|
|
bsOut = d.b2[:slen]
|
|
} else {
|
|
bsOut = make([]byte, slen)
|
|
}
|
|
slen2, err := base64.StdEncoding.Decode(bsOut, bs0)
|
|
if err != nil {
|
|
d.d.errorf("json: error decoding base64 binary '%s': %v", bs0, err)
|
|
return nil
|
|
}
|
|
if slen != slen2 {
|
|
bsOut = bsOut[:slen2]
|
|
}
|
|
return
|
|
}
|
|
|
|
func (d *jsonDecDriver) DecodeString() (s string) {
|
|
d.appendStringAsBytes()
|
|
return d.bsToString()
|
|
}
|
|
|
|
func (d *jsonDecDriver) DecodeStringAsBytes() (s []byte) {
|
|
d.appendStringAsBytes()
|
|
return d.bs
|
|
}
|
|
|
|
func (d *jsonDecDriver) appendStringAsBytes() {
|
|
if d.tok == 0 {
|
|
d.tok = d.r.skip(&jsonCharWhitespaceSet)
|
|
}
|
|
|
|
d.fnull = false
|
|
if d.tok != '"' {
|
|
// d.d.errorf("json: expect char '%c' but got char '%c'", '"', d.tok)
|
|
// handle non-string scalar: null, true, false or a number
|
|
switch d.tok {
|
|
case 'n':
|
|
d.readLit(3, jsonLitNull+1) // (n)ull
|
|
d.bs = d.bs[:0]
|
|
d.fnull = true
|
|
case 'f':
|
|
d.readLit(4, jsonLitFalse+1) // (f)alse
|
|
d.bs = d.bs[:5]
|
|
copy(d.bs, "false")
|
|
case 't':
|
|
d.readLit(3, jsonLitTrue+1) // (t)rue
|
|
d.bs = d.bs[:4]
|
|
copy(d.bs, "true")
|
|
default:
|
|
// try to parse a valid number
|
|
bs := d.decNumBytes()
|
|
d.bs = d.bs[:len(bs)]
|
|
copy(d.bs, bs)
|
|
}
|
|
return
|
|
}
|
|
|
|
d.tok = 0
|
|
r := d.r
|
|
var cs = r.readUntil(d.b2[:0], '"')
|
|
var cslen = len(cs)
|
|
var c uint8
|
|
v := d.bs[:0]
|
|
// append on each byte seen can be expensive, so we just
|
|
// keep track of where we last read a contiguous set of
|
|
// non-special bytes (using cursor variable),
|
|
// and when we see a special byte
|
|
// e.g. end-of-slice, " or \,
|
|
// we will append the full range into the v slice before proceeding
|
|
for i, cursor := 0, 0; ; {
|
|
if i == cslen {
|
|
v = append(v, cs[cursor:]...)
|
|
cs = r.readUntil(d.b2[:0], '"')
|
|
cslen = len(cs)
|
|
i, cursor = 0, 0
|
|
}
|
|
c = cs[i]
|
|
if c == '"' {
|
|
v = append(v, cs[cursor:i]...)
|
|
break
|
|
}
|
|
if c != '\\' {
|
|
i++
|
|
continue
|
|
}
|
|
v = append(v, cs[cursor:i]...)
|
|
i++
|
|
c = cs[i]
|
|
switch c {
|
|
case '"', '\\', '/', '\'':
|
|
v = append(v, c)
|
|
case 'b':
|
|
v = append(v, '\b')
|
|
case 'f':
|
|
v = append(v, '\f')
|
|
case 'n':
|
|
v = append(v, '\n')
|
|
case 'r':
|
|
v = append(v, '\r')
|
|
case 't':
|
|
v = append(v, '\t')
|
|
case 'u':
|
|
var r rune
|
|
var rr uint32
|
|
if len(cs) < i+4 { // may help reduce bounds-checking
|
|
d.d.errorf(`json: need at least 4 more bytes for unicode sequence`)
|
|
}
|
|
// c = cs[i+4] // may help reduce bounds-checking
|
|
for j := 1; j < 5; j++ {
|
|
c = jsonU4Set[cs[i+j]]
|
|
if c == jsonU4SetErrVal {
|
|
// d.d.errorf(`json: unquoteStr: invalid hex char in \u unicode sequence: %q`, c)
|
|
r = unicode.ReplacementChar
|
|
i += 4
|
|
goto encode_rune
|
|
}
|
|
rr = rr*16 + uint32(c)
|
|
}
|
|
r = rune(rr)
|
|
i += 4
|
|
if utf16.IsSurrogate(r) {
|
|
if len(cs) >= i+6 && cs[i+2] == 'u' && cs[i+1] == '\\' {
|
|
i += 2
|
|
// c = cs[i+4] // may help reduce bounds-checking
|
|
var rr1 uint32
|
|
for j := 1; j < 5; j++ {
|
|
c = jsonU4Set[cs[i+j]]
|
|
if c == jsonU4SetErrVal {
|
|
// d.d.errorf(`json: unquoteStr: invalid hex char in \u unicode sequence: %q`, c)
|
|
r = unicode.ReplacementChar
|
|
i += 4
|
|
goto encode_rune
|
|
}
|
|
rr1 = rr1*16 + uint32(c)
|
|
}
|
|
r = utf16.DecodeRune(r, rune(rr1))
|
|
i += 4
|
|
} else {
|
|
r = unicode.ReplacementChar
|
|
goto encode_rune
|
|
}
|
|
}
|
|
encode_rune:
|
|
w2 := utf8.EncodeRune(d.bstr[:], r)
|
|
v = append(v, d.bstr[:w2]...)
|
|
default:
|
|
d.d.errorf("json: unsupported escaped value: %c", c)
|
|
}
|
|
i++
|
|
cursor = i
|
|
}
|
|
d.bs = v
|
|
}
|
|
|
|
func (d *jsonDecDriver) nakedNum(z *decNaked, bs []byte) (err error) {
|
|
if d.h.PreferFloat || jsonIsFloatBytesB3(bs) { // bytes.IndexByte(bs, '.') != -1 ||...
|
|
// } else if d.h.PreferFloat || bytes.ContainsAny(bs, ".eE") {
|
|
z.v = valueTypeFloat
|
|
z.f, err = strconv.ParseFloat(stringView(bs), 64)
|
|
} else if d.h.SignedInteger || bs[0] == '-' {
|
|
z.v = valueTypeInt
|
|
z.i, err = strconv.ParseInt(stringView(bs), 10, 64)
|
|
} else {
|
|
z.v = valueTypeUint
|
|
z.u, err = strconv.ParseUint(stringView(bs), 10, 64)
|
|
}
|
|
if err != nil && z.v != valueTypeFloat {
|
|
if v, ok := err.(*strconv.NumError); ok && (v.Err == strconv.ErrRange || v.Err == strconv.ErrSyntax) {
|
|
z.v = valueTypeFloat
|
|
z.f, err = strconv.ParseFloat(stringView(bs), 64)
|
|
}
|
|
}
|
|
return
|
|
}
|
|
|
|
func (d *jsonDecDriver) bsToString() string {
|
|
// if x := d.s.sc; x != nil && x.so && x.st == '}' { // map key
|
|
if jsonAlwaysReturnInternString || d.c == containerMapKey {
|
|
return d.d.string(d.bs)
|
|
}
|
|
return string(d.bs)
|
|
}
|
|
|
|
func (d *jsonDecDriver) DecodeNaked() {
|
|
z := d.d.n
|
|
// var decodeFurther bool
|
|
|
|
if d.tok == 0 {
|
|
d.tok = d.r.skip(&jsonCharWhitespaceSet)
|
|
}
|
|
switch d.tok {
|
|
case 'n':
|
|
d.readLit(3, jsonLitNull+1) // (n)ull
|
|
z.v = valueTypeNil
|
|
case 'f':
|
|
d.readLit(4, jsonLitFalse+1) // (f)alse
|
|
z.v = valueTypeBool
|
|
z.b = false
|
|
case 't':
|
|
d.readLit(3, jsonLitTrue+1) // (t)rue
|
|
z.v = valueTypeBool
|
|
z.b = true
|
|
case '{':
|
|
z.v = valueTypeMap // don't consume. kInterfaceNaked will call ReadMapStart
|
|
case '[':
|
|
z.v = valueTypeArray // don't consume. kInterfaceNaked will call ReadArrayStart
|
|
case '"':
|
|
// if a string, and MapKeyAsString, then try to decode it as a nil, bool or number first
|
|
d.appendStringAsBytes()
|
|
if len(d.bs) > 0 && d.c == containerMapKey && d.h.MapKeyAsString {
|
|
switch stringView(d.bs) {
|
|
case "null":
|
|
z.v = valueTypeNil
|
|
case "true":
|
|
z.v = valueTypeBool
|
|
z.b = true
|
|
case "false":
|
|
z.v = valueTypeBool
|
|
z.b = false
|
|
default:
|
|
// check if a number: float, int or uint
|
|
if err := d.nakedNum(z, d.bs); err != nil {
|
|
z.v = valueTypeString
|
|
z.s = d.bsToString()
|
|
}
|
|
}
|
|
} else {
|
|
z.v = valueTypeString
|
|
z.s = d.bsToString()
|
|
}
|
|
default: // number
|
|
bs := d.decNumBytes()
|
|
if len(bs) == 0 {
|
|
d.d.errorf("json: decode number from empty string")
|
|
return
|
|
}
|
|
if err := d.nakedNum(z, bs); err != nil {
|
|
d.d.errorf("json: decode number from %s: %v", bs, err)
|
|
return
|
|
}
|
|
}
|
|
// if decodeFurther {
|
|
// d.s.sc.retryRead()
|
|
// }
|
|
return
|
|
}
|
|
|
|
//----------------------
|
|
|
|
// JsonHandle is a handle for JSON encoding format.
|
|
//
|
|
// Json is comprehensively supported:
|
|
// - decodes numbers into interface{} as int, uint or float64
|
|
// - configurable way to encode/decode []byte .
|
|
// by default, encodes and decodes []byte using base64 Std Encoding
|
|
// - UTF-8 support for encoding and decoding
|
|
//
|
|
// It has better performance than the json library in the standard library,
|
|
// by leveraging the performance improvements of the codec library and
|
|
// minimizing allocations.
|
|
//
|
|
// In addition, it doesn't read more bytes than necessary during a decode, which allows
|
|
// reading multiple values from a stream containing json and non-json content.
|
|
// For example, a user can read a json value, then a cbor value, then a msgpack value,
|
|
// all from the same stream in sequence.
|
|
//
|
|
// Note that, when decoding quoted strings, invalid UTF-8 or invalid UTF-16 surrogate pairs
|
|
// are not treated as an error.
|
|
// Instead, they are replaced by the Unicode replacement character U+FFFD.
|
|
type JsonHandle struct {
|
|
textEncodingType
|
|
BasicHandle
|
|
|
|
// RawBytesExt, if configured, is used to encode and decode raw bytes in a custom way.
|
|
// If not configured, raw bytes are encoded to/from base64 text.
|
|
RawBytesExt InterfaceExt
|
|
|
|
// Indent indicates how a value is encoded.
|
|
// - If positive, indent by that number of spaces.
|
|
// - If negative, indent by that number of tabs.
|
|
Indent int8
|
|
|
|
// IntegerAsString controls how integers (signed and unsigned) are encoded.
|
|
//
|
|
// Per the JSON Spec, JSON numbers are 64-bit floating point numbers.
|
|
// Consequently, integers > 2^53 cannot be represented as a JSON number without losing precision.
|
|
// This can be mitigated by configuring how to encode integers.
|
|
//
|
|
// IntegerAsString interpretes the following values:
|
|
// - if 'L', then encode integers > 2^53 as a json string.
|
|
// - if 'A', then encode all integers as a json string
|
|
// containing the exact integer representation as a decimal.
|
|
// - else encode all integers as a json number (default)
|
|
IntegerAsString uint8
|
|
|
|
// HTMLCharsAsIs controls how to encode some special characters to html: < > &
|
|
//
|
|
// By default, we encode them as \uXXX
|
|
// to prevent security holes when served from some browsers.
|
|
HTMLCharsAsIs bool
|
|
|
|
// PreferFloat says that we will default to decoding a number as a float.
|
|
// If not set, we will examine the characters of the number and decode as an
|
|
// integer type if it doesn't have any of the characters [.eE].
|
|
PreferFloat bool
|
|
|
|
// TermWhitespace says that we add a whitespace character
|
|
// at the end of an encoding.
|
|
//
|
|
// The whitespace is important, especially if using numbers in a context
|
|
// where multiple items are written to a stream.
|
|
TermWhitespace bool
|
|
|
|
// MapKeyAsString says to encode all map keys as strings.
|
|
//
|
|
// Use this to enforce strict json output.
|
|
// The only caveat is that nil value is ALWAYS written as null (never as "null")
|
|
MapKeyAsString bool
|
|
}
|
|
|
|
func (h *JsonHandle) hasElemSeparators() bool { return true }
|
|
|
|
// SetInterfaceExt sets an extension
|
|
func (h *JsonHandle) SetInterfaceExt(rt reflect.Type, tag uint64, ext InterfaceExt) (err error) {
|
|
return h.SetExt(rt, tag, &setExtWrapper{i: ext})
|
|
}
|
|
|
|
func (h *JsonHandle) newEncDriver(e *Encoder) encDriver {
|
|
hd := jsonEncDriver{e: e, h: h}
|
|
hd.bs = hd.b[:0]
|
|
|
|
hd.reset()
|
|
|
|
return &hd
|
|
}
|
|
|
|
func (h *JsonHandle) newDecDriver(d *Decoder) decDriver {
|
|
// d := jsonDecDriver{r: r.(*bytesDecReader), h: h}
|
|
hd := jsonDecDriver{d: d, h: h}
|
|
hd.bs = hd.b[:0]
|
|
hd.reset()
|
|
return &hd
|
|
}
|
|
|
|
func (e *jsonEncDriver) reset() {
|
|
e.w = e.e.w
|
|
e.se.i = e.h.RawBytesExt
|
|
if e.bs != nil {
|
|
e.bs = e.bs[:0]
|
|
}
|
|
e.d, e.dt, e.dl, e.ds = false, false, 0, ""
|
|
e.c = 0
|
|
if e.h.Indent > 0 {
|
|
e.d = true
|
|
e.ds = jsonSpaces[:e.h.Indent]
|
|
} else if e.h.Indent < 0 {
|
|
e.d = true
|
|
e.dt = true
|
|
e.ds = jsonTabs[:-(e.h.Indent)]
|
|
}
|
|
}
|
|
|
|
func (d *jsonDecDriver) reset() {
|
|
d.r = d.d.r
|
|
d.se.i = d.h.RawBytesExt
|
|
if d.bs != nil {
|
|
d.bs = d.bs[:0]
|
|
}
|
|
d.c, d.tok = 0, 0
|
|
// d.n.reset()
|
|
}
|
|
|
|
// func jsonIsFloatBytes(bs []byte) bool {
|
|
// for _, v := range bs {
|
|
// // if v == '.' || v == 'e' || v == 'E' {
|
|
// if jsonIsFloatSet.isset(v) {
|
|
// return true
|
|
// }
|
|
// }
|
|
// return false
|
|
// }
|
|
|
|
func jsonIsFloatBytesB2(bs []byte) bool {
|
|
return bytes.IndexByte(bs, '.') != -1 ||
|
|
bytes.IndexByte(bs, 'E') != -1
|
|
}
|
|
|
|
func jsonIsFloatBytesB3(bs []byte) bool {
|
|
return bytes.IndexByte(bs, '.') != -1 ||
|
|
bytes.IndexByte(bs, 'E') != -1 ||
|
|
bytes.IndexByte(bs, 'e') != -1
|
|
}
|
|
|
|
var _ decDriver = (*jsonDecDriver)(nil)
|
|
var _ encDriver = (*jsonEncDriver)(nil)
|