820 lines
19 KiB
Go
820 lines
19 KiB
Go
package decoder
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import (
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"fmt"
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"math"
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"math/bits"
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"sort"
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"strings"
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"unicode"
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"unicode/utf16"
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"unsafe"
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"github.com/goccy/go-json/internal/errors"
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)
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type structFieldSet struct {
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dec Decoder
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offset uintptr
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isTaggedKey bool
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fieldIdx int
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key string
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keyLen int64
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err error
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}
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type structDecoder struct {
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fieldMap map[string]*structFieldSet
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fieldUniqueNameNum int
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stringDecoder *stringDecoder
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structName string
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fieldName string
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isTriedOptimize bool
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keyBitmapUint8 [][256]uint8
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keyBitmapUint16 [][256]uint16
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sortedFieldSets []*structFieldSet
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keyDecoder func(*structDecoder, []byte, int64) (int64, *structFieldSet, error)
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keyStreamDecoder func(*structDecoder, *Stream) (*structFieldSet, string, error)
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}
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var (
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largeToSmallTable [256]byte
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)
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func init() {
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for i := 0; i < 256; i++ {
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c := i
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if 'A' <= c && c <= 'Z' {
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c += 'a' - 'A'
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}
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largeToSmallTable[i] = byte(c)
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}
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}
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func newStructDecoder(structName, fieldName string, fieldMap map[string]*structFieldSet) *structDecoder {
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return &structDecoder{
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fieldMap: fieldMap,
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stringDecoder: newStringDecoder(structName, fieldName),
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structName: structName,
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fieldName: fieldName,
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keyDecoder: decodeKey,
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keyStreamDecoder: decodeKeyStream,
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}
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}
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const (
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allowOptimizeMaxKeyLen = 64
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allowOptimizeMaxFieldLen = 16
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)
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func (d *structDecoder) tryOptimize() {
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fieldUniqueNameMap := map[string]int{}
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fieldIdx := -1
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for k, v := range d.fieldMap {
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lower := strings.ToLower(k)
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idx, exists := fieldUniqueNameMap[lower]
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if exists {
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v.fieldIdx = idx
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} else {
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fieldIdx++
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v.fieldIdx = fieldIdx
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}
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fieldUniqueNameMap[lower] = fieldIdx
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}
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d.fieldUniqueNameNum = len(fieldUniqueNameMap)
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if d.isTriedOptimize {
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return
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}
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fieldMap := map[string]*structFieldSet{}
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conflicted := map[string]struct{}{}
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for k, v := range d.fieldMap {
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key := strings.ToLower(k)
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if key != k {
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// already exists same key (e.g. Hello and HELLO has same lower case key
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if _, exists := conflicted[key]; exists {
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d.isTriedOptimize = true
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return
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}
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conflicted[key] = struct{}{}
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}
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if field, exists := fieldMap[key]; exists {
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if field != v {
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d.isTriedOptimize = true
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return
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}
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}
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fieldMap[key] = v
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}
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if len(fieldMap) > allowOptimizeMaxFieldLen {
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d.isTriedOptimize = true
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return
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}
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var maxKeyLen int
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sortedKeys := []string{}
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for key := range fieldMap {
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keyLen := len(key)
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if keyLen > allowOptimizeMaxKeyLen {
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d.isTriedOptimize = true
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return
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}
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if maxKeyLen < keyLen {
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maxKeyLen = keyLen
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}
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sortedKeys = append(sortedKeys, key)
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}
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sort.Strings(sortedKeys)
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// By allocating one extra capacity than `maxKeyLen`,
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// it is possible to avoid the process of comparing the index of the key with the length of the bitmap each time.
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bitmapLen := maxKeyLen + 1
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if len(sortedKeys) <= 8 {
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keyBitmap := make([][256]uint8, bitmapLen)
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for i, key := range sortedKeys {
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for j := 0; j < len(key); j++ {
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c := key[j]
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keyBitmap[j][c] |= (1 << uint(i))
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}
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d.sortedFieldSets = append(d.sortedFieldSets, fieldMap[key])
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}
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d.keyBitmapUint8 = keyBitmap
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d.keyDecoder = decodeKeyByBitmapUint8
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d.keyStreamDecoder = decodeKeyByBitmapUint8Stream
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} else {
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keyBitmap := make([][256]uint16, bitmapLen)
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for i, key := range sortedKeys {
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for j := 0; j < len(key); j++ {
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c := key[j]
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keyBitmap[j][c] |= (1 << uint(i))
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}
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d.sortedFieldSets = append(d.sortedFieldSets, fieldMap[key])
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}
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d.keyBitmapUint16 = keyBitmap
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d.keyDecoder = decodeKeyByBitmapUint16
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d.keyStreamDecoder = decodeKeyByBitmapUint16Stream
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}
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}
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// decode from '\uXXXX'
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func decodeKeyCharByUnicodeRune(buf []byte, cursor int64) ([]byte, int64) {
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const defaultOffset = 4
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const surrogateOffset = 6
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r := unicodeToRune(buf[cursor : cursor+defaultOffset])
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if utf16.IsSurrogate(r) {
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cursor += defaultOffset
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if cursor+surrogateOffset >= int64(len(buf)) || buf[cursor] != '\\' || buf[cursor+1] != 'u' {
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return []byte(string(unicode.ReplacementChar)), cursor + defaultOffset - 1
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}
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cursor += 2
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r2 := unicodeToRune(buf[cursor : cursor+defaultOffset])
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if r := utf16.DecodeRune(r, r2); r != unicode.ReplacementChar {
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return []byte(string(r)), cursor + defaultOffset - 1
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}
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}
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return []byte(string(r)), cursor + defaultOffset - 1
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}
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func decodeKeyCharByEscapedChar(buf []byte, cursor int64) ([]byte, int64) {
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c := buf[cursor]
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cursor++
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switch c {
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case '"':
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return []byte{'"'}, cursor
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case '\\':
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return []byte{'\\'}, cursor
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case '/':
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return []byte{'/'}, cursor
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case 'b':
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return []byte{'\b'}, cursor
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case 'f':
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return []byte{'\f'}, cursor
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case 'n':
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return []byte{'\n'}, cursor
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case 'r':
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return []byte{'\r'}, cursor
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case 't':
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return []byte{'\t'}, cursor
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case 'u':
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return decodeKeyCharByUnicodeRune(buf, cursor)
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}
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return nil, cursor
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}
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func decodeKeyByBitmapUint8(d *structDecoder, buf []byte, cursor int64) (int64, *structFieldSet, error) {
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var (
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curBit uint8 = math.MaxUint8
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)
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b := (*sliceHeader)(unsafe.Pointer(&buf)).data
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for {
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switch char(b, cursor) {
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case ' ', '\n', '\t', '\r':
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cursor++
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case '"':
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cursor++
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c := char(b, cursor)
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switch c {
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case '"':
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cursor++
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return cursor, nil, nil
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case nul:
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return 0, nil, errors.ErrUnexpectedEndOfJSON("string", cursor)
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}
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keyIdx := 0
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bitmap := d.keyBitmapUint8
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start := cursor
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for {
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c := char(b, cursor)
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switch c {
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case '"':
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fieldSetIndex := bits.TrailingZeros8(curBit)
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field := d.sortedFieldSets[fieldSetIndex]
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keyLen := cursor - start
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cursor++
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if keyLen < field.keyLen {
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// early match
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return cursor, nil, nil
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}
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return cursor, field, nil
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case nul:
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return 0, nil, errors.ErrUnexpectedEndOfJSON("string", cursor)
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case '\\':
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cursor++
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chars, nextCursor := decodeKeyCharByEscapedChar(buf, cursor)
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for _, c := range chars {
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curBit &= bitmap[keyIdx][largeToSmallTable[c]]
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if curBit == 0 {
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return decodeKeyNotFound(b, cursor)
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}
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keyIdx++
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}
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cursor = nextCursor
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default:
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curBit &= bitmap[keyIdx][largeToSmallTable[c]]
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if curBit == 0 {
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return decodeKeyNotFound(b, cursor)
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}
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keyIdx++
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}
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cursor++
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}
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default:
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return cursor, nil, errors.ErrInvalidBeginningOfValue(char(b, cursor), cursor)
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}
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}
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}
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func decodeKeyByBitmapUint16(d *structDecoder, buf []byte, cursor int64) (int64, *structFieldSet, error) {
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var (
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curBit uint16 = math.MaxUint16
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)
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b := (*sliceHeader)(unsafe.Pointer(&buf)).data
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for {
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switch char(b, cursor) {
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case ' ', '\n', '\t', '\r':
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cursor++
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case '"':
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cursor++
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c := char(b, cursor)
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switch c {
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case '"':
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cursor++
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return cursor, nil, nil
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case nul:
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return 0, nil, errors.ErrUnexpectedEndOfJSON("string", cursor)
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}
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keyIdx := 0
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bitmap := d.keyBitmapUint16
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start := cursor
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for {
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c := char(b, cursor)
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switch c {
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case '"':
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fieldSetIndex := bits.TrailingZeros16(curBit)
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field := d.sortedFieldSets[fieldSetIndex]
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keyLen := cursor - start
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cursor++
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if keyLen < field.keyLen {
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// early match
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return cursor, nil, nil
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}
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return cursor, field, nil
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case nul:
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return 0, nil, errors.ErrUnexpectedEndOfJSON("string", cursor)
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case '\\':
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cursor++
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chars, nextCursor := decodeKeyCharByEscapedChar(buf, cursor)
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for _, c := range chars {
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curBit &= bitmap[keyIdx][largeToSmallTable[c]]
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if curBit == 0 {
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return decodeKeyNotFound(b, cursor)
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}
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keyIdx++
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}
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cursor = nextCursor
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default:
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curBit &= bitmap[keyIdx][largeToSmallTable[c]]
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if curBit == 0 {
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return decodeKeyNotFound(b, cursor)
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}
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keyIdx++
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}
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cursor++
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}
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default:
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return cursor, nil, errors.ErrInvalidBeginningOfValue(char(b, cursor), cursor)
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}
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}
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}
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func decodeKeyNotFound(b unsafe.Pointer, cursor int64) (int64, *structFieldSet, error) {
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for {
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cursor++
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switch char(b, cursor) {
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case '"':
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cursor++
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return cursor, nil, nil
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case '\\':
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cursor++
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if char(b, cursor) == nul {
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return 0, nil, errors.ErrUnexpectedEndOfJSON("string", cursor)
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}
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case nul:
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return 0, nil, errors.ErrUnexpectedEndOfJSON("string", cursor)
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}
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}
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}
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func decodeKey(d *structDecoder, buf []byte, cursor int64) (int64, *structFieldSet, error) {
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key, c, err := d.stringDecoder.decodeByte(buf, cursor)
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if err != nil {
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return 0, nil, err
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}
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cursor = c
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k := *(*string)(unsafe.Pointer(&key))
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field, exists := d.fieldMap[k]
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if !exists {
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return cursor, nil, nil
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}
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return cursor, field, nil
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}
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func decodeKeyByBitmapUint8Stream(d *structDecoder, s *Stream) (*structFieldSet, string, error) {
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var (
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curBit uint8 = math.MaxUint8
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)
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_, cursor, p := s.stat()
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for {
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switch char(p, cursor) {
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case ' ', '\n', '\t', '\r':
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cursor++
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case nul:
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s.cursor = cursor
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if s.read() {
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_, cursor, p = s.stat()
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continue
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}
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return nil, "", errors.ErrInvalidBeginningOfValue(char(p, cursor), s.totalOffset())
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case '"':
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cursor++
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FIRST_CHAR:
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start := cursor
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switch char(p, cursor) {
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case '"':
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cursor++
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s.cursor = cursor
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return nil, "", nil
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case nul:
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s.cursor = cursor
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if s.read() {
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_, cursor, p = s.stat()
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goto FIRST_CHAR
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}
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return nil, "", errors.ErrUnexpectedEndOfJSON("string", s.totalOffset())
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}
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keyIdx := 0
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bitmap := d.keyBitmapUint8
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for {
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c := char(p, cursor)
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switch c {
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case '"':
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fieldSetIndex := bits.TrailingZeros8(curBit)
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field := d.sortedFieldSets[fieldSetIndex]
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keyLen := cursor - start
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cursor++
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s.cursor = cursor
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if keyLen < field.keyLen {
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// early match
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return nil, field.key, nil
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}
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return field, field.key, nil
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case nul:
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s.cursor = cursor
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if s.read() {
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_, cursor, p = s.stat()
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continue
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}
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return nil, "", errors.ErrUnexpectedEndOfJSON("string", s.totalOffset())
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case '\\':
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s.cursor = cursor + 1 // skip '\' char
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chars, err := decodeKeyCharByEscapeCharStream(s)
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if err != nil {
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return nil, "", err
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}
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cursor = s.cursor
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for _, c := range chars {
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curBit &= bitmap[keyIdx][largeToSmallTable[c]]
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if curBit == 0 {
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s.cursor = cursor
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return decodeKeyNotFoundStream(s, start)
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}
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keyIdx++
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}
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default:
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curBit &= bitmap[keyIdx][largeToSmallTable[c]]
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if curBit == 0 {
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s.cursor = cursor
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return decodeKeyNotFoundStream(s, start)
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}
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keyIdx++
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}
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cursor++
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}
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default:
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return nil, "", errors.ErrInvalidBeginningOfValue(char(p, cursor), s.totalOffset())
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}
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}
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}
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func decodeKeyByBitmapUint16Stream(d *structDecoder, s *Stream) (*structFieldSet, string, error) {
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var (
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curBit uint16 = math.MaxUint16
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)
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_, cursor, p := s.stat()
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for {
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switch char(p, cursor) {
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case ' ', '\n', '\t', '\r':
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cursor++
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case nul:
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s.cursor = cursor
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if s.read() {
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_, cursor, p = s.stat()
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continue
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}
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return nil, "", errors.ErrInvalidBeginningOfValue(char(p, cursor), s.totalOffset())
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case '"':
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cursor++
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FIRST_CHAR:
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start := cursor
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switch char(p, cursor) {
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case '"':
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cursor++
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s.cursor = cursor
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return nil, "", nil
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case nul:
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s.cursor = cursor
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if s.read() {
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_, cursor, p = s.stat()
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goto FIRST_CHAR
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}
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return nil, "", errors.ErrUnexpectedEndOfJSON("string", s.totalOffset())
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}
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keyIdx := 0
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bitmap := d.keyBitmapUint16
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for {
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c := char(p, cursor)
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switch c {
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case '"':
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fieldSetIndex := bits.TrailingZeros16(curBit)
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field := d.sortedFieldSets[fieldSetIndex]
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keyLen := cursor - start
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cursor++
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s.cursor = cursor
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if keyLen < field.keyLen {
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// early match
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return nil, field.key, nil
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}
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return field, field.key, nil
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case nul:
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s.cursor = cursor
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if s.read() {
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_, cursor, p = s.stat()
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continue
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}
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return nil, "", errors.ErrUnexpectedEndOfJSON("string", s.totalOffset())
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case '\\':
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s.cursor = cursor + 1 // skip '\' char
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chars, err := decodeKeyCharByEscapeCharStream(s)
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if err != nil {
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return nil, "", err
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}
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cursor = s.cursor
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for _, c := range chars {
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curBit &= bitmap[keyIdx][largeToSmallTable[c]]
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if curBit == 0 {
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s.cursor = cursor
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return decodeKeyNotFoundStream(s, start)
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}
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keyIdx++
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}
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default:
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curBit &= bitmap[keyIdx][largeToSmallTable[c]]
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if curBit == 0 {
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s.cursor = cursor
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return decodeKeyNotFoundStream(s, start)
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}
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keyIdx++
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}
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cursor++
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}
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default:
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return nil, "", errors.ErrInvalidBeginningOfValue(char(p, cursor), s.totalOffset())
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}
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}
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}
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// decode from '\uXXXX'
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func decodeKeyCharByUnicodeRuneStream(s *Stream) ([]byte, error) {
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const defaultOffset = 4
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const surrogateOffset = 6
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if s.cursor+defaultOffset >= s.length {
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if !s.read() {
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return nil, errors.ErrInvalidCharacter(s.char(), "escaped unicode char", s.totalOffset())
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}
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}
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r := unicodeToRune(s.buf[s.cursor : s.cursor+defaultOffset])
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if utf16.IsSurrogate(r) {
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s.cursor += defaultOffset
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if s.cursor+surrogateOffset >= s.length {
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s.read()
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}
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if s.cursor+surrogateOffset >= s.length || s.buf[s.cursor] != '\\' || s.buf[s.cursor+1] != 'u' {
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s.cursor += defaultOffset - 1
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return []byte(string(unicode.ReplacementChar)), nil
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}
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r2 := unicodeToRune(s.buf[s.cursor+defaultOffset+2 : s.cursor+surrogateOffset])
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if r := utf16.DecodeRune(r, r2); r != unicode.ReplacementChar {
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s.cursor += defaultOffset - 1
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return []byte(string(r)), nil
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}
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}
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s.cursor += defaultOffset - 1
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return []byte(string(r)), nil
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}
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|
|
func decodeKeyCharByEscapeCharStream(s *Stream) ([]byte, error) {
|
|
c := s.buf[s.cursor]
|
|
s.cursor++
|
|
RETRY:
|
|
switch c {
|
|
case '"':
|
|
return []byte{'"'}, nil
|
|
case '\\':
|
|
return []byte{'\\'}, nil
|
|
case '/':
|
|
return []byte{'/'}, nil
|
|
case 'b':
|
|
return []byte{'\b'}, nil
|
|
case 'f':
|
|
return []byte{'\f'}, nil
|
|
case 'n':
|
|
return []byte{'\n'}, nil
|
|
case 'r':
|
|
return []byte{'\r'}, nil
|
|
case 't':
|
|
return []byte{'\t'}, nil
|
|
case 'u':
|
|
return decodeKeyCharByUnicodeRuneStream(s)
|
|
case nul:
|
|
if !s.read() {
|
|
return nil, errors.ErrInvalidCharacter(s.char(), "escaped char", s.totalOffset())
|
|
}
|
|
goto RETRY
|
|
default:
|
|
return nil, errors.ErrUnexpectedEndOfJSON("struct field", s.totalOffset())
|
|
}
|
|
}
|
|
|
|
func decodeKeyNotFoundStream(s *Stream, start int64) (*structFieldSet, string, error) {
|
|
buf, cursor, p := s.stat()
|
|
for {
|
|
cursor++
|
|
switch char(p, cursor) {
|
|
case '"':
|
|
b := buf[start:cursor]
|
|
key := *(*string)(unsafe.Pointer(&b))
|
|
cursor++
|
|
s.cursor = cursor
|
|
return nil, key, nil
|
|
case '\\':
|
|
cursor++
|
|
if char(p, cursor) == nul {
|
|
s.cursor = cursor
|
|
if !s.read() {
|
|
return nil, "", errors.ErrUnexpectedEndOfJSON("string", s.totalOffset())
|
|
}
|
|
buf, cursor, p = s.statForRetry()
|
|
}
|
|
case nul:
|
|
s.cursor = cursor
|
|
if !s.read() {
|
|
return nil, "", errors.ErrUnexpectedEndOfJSON("string", s.totalOffset())
|
|
}
|
|
buf, cursor, p = s.statForRetry()
|
|
}
|
|
}
|
|
}
|
|
|
|
func decodeKeyStream(d *structDecoder, s *Stream) (*structFieldSet, string, error) {
|
|
key, err := d.stringDecoder.decodeStreamByte(s)
|
|
if err != nil {
|
|
return nil, "", err
|
|
}
|
|
k := *(*string)(unsafe.Pointer(&key))
|
|
return d.fieldMap[k], k, nil
|
|
}
|
|
|
|
func (d *structDecoder) DecodeStream(s *Stream, depth int64, p unsafe.Pointer) error {
|
|
depth++
|
|
if depth > maxDecodeNestingDepth {
|
|
return errors.ErrExceededMaxDepth(s.char(), s.cursor)
|
|
}
|
|
|
|
c := s.skipWhiteSpace()
|
|
switch c {
|
|
case 'n':
|
|
if err := nullBytes(s); err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
default:
|
|
if s.char() != '{' {
|
|
return errors.ErrInvalidBeginningOfValue(s.char(), s.totalOffset())
|
|
}
|
|
}
|
|
s.cursor++
|
|
if s.skipWhiteSpace() == '}' {
|
|
s.cursor++
|
|
return nil
|
|
}
|
|
var (
|
|
seenFields map[int]struct{}
|
|
seenFieldNum int
|
|
)
|
|
firstWin := (s.Option.Flags & FirstWinOption) != 0
|
|
if firstWin {
|
|
seenFields = make(map[int]struct{}, d.fieldUniqueNameNum)
|
|
}
|
|
for {
|
|
s.reset()
|
|
field, key, err := d.keyStreamDecoder(d, s)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if s.skipWhiteSpace() != ':' {
|
|
return errors.ErrExpected("colon after object key", s.totalOffset())
|
|
}
|
|
s.cursor++
|
|
if field != nil {
|
|
if field.err != nil {
|
|
return field.err
|
|
}
|
|
if firstWin {
|
|
if _, exists := seenFields[field.fieldIdx]; exists {
|
|
if err := s.skipValue(depth); err != nil {
|
|
return err
|
|
}
|
|
} else {
|
|
if err := field.dec.DecodeStream(s, depth, unsafe.Pointer(uintptr(p)+field.offset)); err != nil {
|
|
return err
|
|
}
|
|
seenFieldNum++
|
|
if d.fieldUniqueNameNum <= seenFieldNum {
|
|
return s.skipObject(depth)
|
|
}
|
|
seenFields[field.fieldIdx] = struct{}{}
|
|
}
|
|
} else {
|
|
if err := field.dec.DecodeStream(s, depth, unsafe.Pointer(uintptr(p)+field.offset)); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
} else if s.DisallowUnknownFields {
|
|
return fmt.Errorf("json: unknown field %q", key)
|
|
} else {
|
|
if err := s.skipValue(depth); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
c := s.skipWhiteSpace()
|
|
if c == '}' {
|
|
s.cursor++
|
|
return nil
|
|
}
|
|
if c != ',' {
|
|
return errors.ErrExpected("comma after object element", s.totalOffset())
|
|
}
|
|
s.cursor++
|
|
}
|
|
}
|
|
|
|
func (d *structDecoder) Decode(ctx *RuntimeContext, cursor, depth int64, p unsafe.Pointer) (int64, error) {
|
|
buf := ctx.Buf
|
|
depth++
|
|
if depth > maxDecodeNestingDepth {
|
|
return 0, errors.ErrExceededMaxDepth(buf[cursor], cursor)
|
|
}
|
|
buflen := int64(len(buf))
|
|
cursor = skipWhiteSpace(buf, cursor)
|
|
b := (*sliceHeader)(unsafe.Pointer(&buf)).data
|
|
switch char(b, cursor) {
|
|
case 'n':
|
|
if err := validateNull(buf, cursor); err != nil {
|
|
return 0, err
|
|
}
|
|
cursor += 4
|
|
return cursor, nil
|
|
case '{':
|
|
default:
|
|
return 0, errors.ErrInvalidBeginningOfValue(char(b, cursor), cursor)
|
|
}
|
|
cursor++
|
|
cursor = skipWhiteSpace(buf, cursor)
|
|
if buf[cursor] == '}' {
|
|
cursor++
|
|
return cursor, nil
|
|
}
|
|
var (
|
|
seenFields map[int]struct{}
|
|
seenFieldNum int
|
|
)
|
|
firstWin := (ctx.Option.Flags & FirstWinOption) != 0
|
|
if firstWin {
|
|
seenFields = make(map[int]struct{}, d.fieldUniqueNameNum)
|
|
}
|
|
for {
|
|
c, field, err := d.keyDecoder(d, buf, cursor)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
cursor = skipWhiteSpace(buf, c)
|
|
if char(b, cursor) != ':' {
|
|
return 0, errors.ErrExpected("colon after object key", cursor)
|
|
}
|
|
cursor++
|
|
if cursor >= buflen {
|
|
return 0, errors.ErrExpected("object value after colon", cursor)
|
|
}
|
|
if field != nil {
|
|
if field.err != nil {
|
|
return 0, field.err
|
|
}
|
|
if firstWin {
|
|
if _, exists := seenFields[field.fieldIdx]; exists {
|
|
c, err := skipValue(buf, cursor, depth)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
cursor = c
|
|
} else {
|
|
c, err := field.dec.Decode(ctx, cursor, depth, unsafe.Pointer(uintptr(p)+field.offset))
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
cursor = c
|
|
seenFieldNum++
|
|
if d.fieldUniqueNameNum <= seenFieldNum {
|
|
return skipObject(buf, cursor, depth)
|
|
}
|
|
seenFields[field.fieldIdx] = struct{}{}
|
|
}
|
|
} else {
|
|
c, err := field.dec.Decode(ctx, cursor, depth, unsafe.Pointer(uintptr(p)+field.offset))
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
cursor = c
|
|
}
|
|
} else {
|
|
c, err := skipValue(buf, cursor, depth)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
cursor = c
|
|
}
|
|
cursor = skipWhiteSpace(buf, cursor)
|
|
if char(b, cursor) == '}' {
|
|
cursor++
|
|
return cursor, nil
|
|
}
|
|
if char(b, cursor) != ',' {
|
|
return 0, errors.ErrExpected("comma after object element", cursor)
|
|
}
|
|
cursor++
|
|
}
|
|
}
|