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|
package decoder
import (
"sync"
"unsafe"
"github.com/goccy/go-json/internal/errors"
)
type RuntimeContext struct {
Buf []byte
Option *Option
}
var (
runtimeContextPool = sync.Pool{
New: func() interface{} {
return &RuntimeContext{
Option: &Option{},
}
},
}
)
func TakeRuntimeContext() *RuntimeContext {
return runtimeContextPool.Get().(*RuntimeContext)
}
func ReleaseRuntimeContext(ctx *RuntimeContext) {
runtimeContextPool.Put(ctx)
}
var (
isWhiteSpace = [256]bool{}
)
func init() {
isWhiteSpace[' '] = true
isWhiteSpace['\n'] = true
isWhiteSpace['\t'] = true
isWhiteSpace['\r'] = true
}
func char(ptr unsafe.Pointer, offset int64) byte {
return *(*byte)(unsafe.Pointer(uintptr(ptr) + uintptr(offset)))
}
func skipWhiteSpace(buf []byte, cursor int64) int64 {
for isWhiteSpace[buf[cursor]] {
cursor++
}
return cursor
}
func skipObject(buf []byte, cursor, depth int64) (int64, error) {
braceCount := 1
for {
switch buf[cursor] {
case '{':
braceCount++
depth++
if depth > maxDecodeNestingDepth {
return 0, errors.ErrExceededMaxDepth(buf[cursor], cursor)
}
case '}':
depth--
braceCount--
if braceCount == 0 {
return cursor + 1, nil
}
case '[':
depth++
if depth > maxDecodeNestingDepth {
return 0, errors.ErrExceededMaxDepth(buf[cursor], cursor)
}
case ']':
depth--
case '"':
for {
cursor++
switch buf[cursor] {
case '\\':
cursor++
if buf[cursor] == nul {
return 0, errors.ErrUnexpectedEndOfJSON("string of object", cursor)
}
case '"':
goto SWITCH_OUT
case nul:
return 0, errors.ErrUnexpectedEndOfJSON("string of object", cursor)
}
}
case nul:
return 0, errors.ErrUnexpectedEndOfJSON("object of object", cursor)
}
SWITCH_OUT:
cursor++
}
}
func skipArray(buf []byte, cursor, depth int64) (int64, error) {
bracketCount := 1
for {
switch buf[cursor] {
case '[':
bracketCount++
depth++
if depth > maxDecodeNestingDepth {
return 0, errors.ErrExceededMaxDepth(buf[cursor], cursor)
}
case ']':
bracketCount--
depth--
if bracketCount == 0 {
return cursor + 1, nil
}
case '{':
depth++
if depth > maxDecodeNestingDepth {
return 0, errors.ErrExceededMaxDepth(buf[cursor], cursor)
}
case '}':
depth--
case '"':
for {
cursor++
switch buf[cursor] {
case '\\':
cursor++
if buf[cursor] == nul {
return 0, errors.ErrUnexpectedEndOfJSON("string of object", cursor)
}
case '"':
goto SWITCH_OUT
case nul:
return 0, errors.ErrUnexpectedEndOfJSON("string of object", cursor)
}
}
case nul:
return 0, errors.ErrUnexpectedEndOfJSON("array of object", cursor)
}
SWITCH_OUT:
cursor++
}
}
func skipValue(buf []byte, cursor, depth int64) (int64, error) {
for {
switch buf[cursor] {
case ' ', '\t', '\n', '\r':
cursor++
continue
case '{':
return skipObject(buf, cursor+1, depth+1)
case '[':
return skipArray(buf, cursor+1, depth+1)
case '"':
for {
cursor++
switch buf[cursor] {
case '\\':
cursor++
if buf[cursor] == nul {
return 0, errors.ErrUnexpectedEndOfJSON("string of object", cursor)
}
case '"':
return cursor + 1, nil
case nul:
return 0, errors.ErrUnexpectedEndOfJSON("string of object", cursor)
}
}
case '-', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
for {
cursor++
if floatTable[buf[cursor]] {
continue
}
break
}
return cursor, nil
case 't':
if err := validateTrue(buf, cursor); err != nil {
return 0, err
}
cursor += 4
return cursor, nil
case 'f':
if err := validateFalse(buf, cursor); err != nil {
return 0, err
}
cursor += 5
return cursor, nil
case 'n':
if err := validateNull(buf, cursor); err != nil {
return 0, err
}
cursor += 4
return cursor, nil
default:
return cursor, errors.ErrUnexpectedEndOfJSON("null", cursor)
}
}
}
func validateTrue(buf []byte, cursor int64) error {
if cursor+3 >= int64(len(buf)) {
return errors.ErrUnexpectedEndOfJSON("true", cursor)
}
if buf[cursor+1] != 'r' {
return errors.ErrInvalidCharacter(buf[cursor+1], "true", cursor)
}
if buf[cursor+2] != 'u' {
return errors.ErrInvalidCharacter(buf[cursor+2], "true", cursor)
}
if buf[cursor+3] != 'e' {
return errors.ErrInvalidCharacter(buf[cursor+3], "true", cursor)
}
return nil
}
func validateFalse(buf []byte, cursor int64) error {
if cursor+4 >= int64(len(buf)) {
return errors.ErrUnexpectedEndOfJSON("false", cursor)
}
if buf[cursor+1] != 'a' {
return errors.ErrInvalidCharacter(buf[cursor+1], "false", cursor)
}
if buf[cursor+2] != 'l' {
return errors.ErrInvalidCharacter(buf[cursor+2], "false", cursor)
}
if buf[cursor+3] != 's' {
return errors.ErrInvalidCharacter(buf[cursor+3], "false", cursor)
}
if buf[cursor+4] != 'e' {
return errors.ErrInvalidCharacter(buf[cursor+4], "false", cursor)
}
return nil
}
func validateNull(buf []byte, cursor int64) error {
if cursor+3 >= int64(len(buf)) {
return errors.ErrUnexpectedEndOfJSON("null", cursor)
}
if buf[cursor+1] != 'u' {
return errors.ErrInvalidCharacter(buf[cursor+1], "null", cursor)
}
if buf[cursor+2] != 'l' {
return errors.ErrInvalidCharacter(buf[cursor+2], "null", cursor)
}
if buf[cursor+3] != 'l' {
return errors.ErrInvalidCharacter(buf[cursor+3], "null", cursor)
}
return nil
}
|
