656 lines
16 KiB
Go
656 lines
16 KiB
Go
/*
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* Copyright 2021 ByteDance Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package ast
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import (
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`fmt`
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`github.com/bytedance/sonic/internal/native/types`
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`github.com/bytedance/sonic/internal/rt`
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)
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const (
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_DEFAULT_NODE_CAP int = 8
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_APPEND_GROW_SHIFT = 1
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)
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const (
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_ERR_NOT_FOUND types.ParsingError = 33
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_ERR_UNSUPPORT_TYPE types.ParsingError = 34
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)
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var (
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// ErrNotExist means both key and value doesn't exist
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ErrNotExist error = newError(_ERR_NOT_FOUND, "value not exists")
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// ErrUnsupportType means API on the node is unsupported
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ErrUnsupportType error = newError(_ERR_UNSUPPORT_TYPE, "unsupported type")
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)
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type Parser struct {
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p int
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s string
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noLazy bool
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skipValue bool
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dbuf *byte
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}
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/** Parser Private Methods **/
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func (self *Parser) delim() types.ParsingError {
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n := len(self.s)
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p := self.lspace(self.p)
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/* check for EOF */
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if p >= n {
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return types.ERR_EOF
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}
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/* check for the delimtier */
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if self.s[p] != ':' {
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return types.ERR_INVALID_CHAR
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}
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/* update the read pointer */
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self.p = p + 1
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return 0
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}
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func (self *Parser) object() types.ParsingError {
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n := len(self.s)
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p := self.lspace(self.p)
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/* check for EOF */
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if p >= n {
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return types.ERR_EOF
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}
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/* check for the delimtier */
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if self.s[p] != '{' {
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return types.ERR_INVALID_CHAR
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}
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/* update the read pointer */
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self.p = p + 1
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return 0
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}
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func (self *Parser) array() types.ParsingError {
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n := len(self.s)
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p := self.lspace(self.p)
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/* check for EOF */
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if p >= n {
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return types.ERR_EOF
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}
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/* check for the delimtier */
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if self.s[p] != '[' {
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return types.ERR_INVALID_CHAR
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}
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/* update the read pointer */
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self.p = p + 1
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return 0
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}
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func (self *Parser) lspace(sp int) int {
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ns := len(self.s)
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for ; sp<ns && isSpace(self.s[sp]); sp+=1 {}
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return sp
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}
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func (self *Parser) decodeArray(ret *linkedNodes) (Node, types.ParsingError) {
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sp := self.p
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ns := len(self.s)
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/* check for EOF */
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if self.p = self.lspace(sp); self.p >= ns {
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return Node{}, types.ERR_EOF
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}
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/* check for empty array */
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if self.s[self.p] == ']' {
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self.p++
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return Node{t: types.V_ARRAY}, 0
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}
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/* allocate array space and parse every element */
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for {
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var val Node
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var err types.ParsingError
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if self.skipValue {
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/* skip the value */
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var start int
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if start, err = self.skipFast(); err != 0 {
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return Node{}, err
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}
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if self.p > ns {
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return Node{}, types.ERR_EOF
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}
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t := switchRawType(self.s[start])
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if t == _V_NONE {
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return Node{}, types.ERR_INVALID_CHAR
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}
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val = newRawNode(self.s[start:self.p], t)
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}else{
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/* decode the value */
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if val, err = self.Parse(); err != 0 {
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return Node{}, err
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}
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}
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/* add the value to result */
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ret.Push(val)
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self.p = self.lspace(self.p)
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/* check for EOF */
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if self.p >= ns {
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return Node{}, types.ERR_EOF
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}
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/* check for the next character */
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switch self.s[self.p] {
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case ',' : self.p++
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case ']' : self.p++; return newArray(ret), 0
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default:
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// if val.isLazy() {
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// return newLazyArray(self, ret), 0
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// }
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return Node{}, types.ERR_INVALID_CHAR
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}
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}
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}
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func (self *Parser) decodeObject(ret *linkedPairs) (Node, types.ParsingError) {
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sp := self.p
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ns := len(self.s)
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/* check for EOF */
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if self.p = self.lspace(sp); self.p >= ns {
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return Node{}, types.ERR_EOF
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}
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/* check for empty object */
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if self.s[self.p] == '}' {
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self.p++
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return Node{t: types.V_OBJECT}, 0
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}
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/* decode each pair */
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for {
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var val Node
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var njs types.JsonState
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var err types.ParsingError
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/* decode the key */
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if njs = self.decodeValue(); njs.Vt != types.V_STRING {
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return Node{}, types.ERR_INVALID_CHAR
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}
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/* extract the key */
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idx := self.p - 1
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key := self.s[njs.Iv:idx]
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/* check for escape sequence */
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if njs.Ep != -1 {
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if key, err = unquote(key); err != 0 {
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return Node{}, err
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}
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}
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/* expect a ':' delimiter */
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if err = self.delim(); err != 0 {
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return Node{}, err
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}
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if self.skipValue {
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/* skip the value */
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var start int
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if start, err = self.skipFast(); err != 0 {
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return Node{}, err
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}
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if self.p > ns {
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return Node{}, types.ERR_EOF
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}
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t := switchRawType(self.s[start])
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if t == _V_NONE {
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return Node{}, types.ERR_INVALID_CHAR
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}
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val = newRawNode(self.s[start:self.p], t)
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} else {
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/* decode the value */
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if val, err = self.Parse(); err != 0 {
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return Node{}, err
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}
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}
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/* add the value to result */
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// FIXME: ret's address may change here, thus previous referred node in ret may be invalid !!
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ret.Push(Pair{Key: key, Value: val})
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self.p = self.lspace(self.p)
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/* check for EOF */
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if self.p >= ns {
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return Node{}, types.ERR_EOF
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}
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/* check for the next character */
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switch self.s[self.p] {
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case ',' : self.p++
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case '}' : self.p++; return newObject(ret), 0
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default:
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// if val.isLazy() {
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// return newLazyObject(self, ret), 0
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// }
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return Node{}, types.ERR_INVALID_CHAR
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}
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}
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}
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func (self *Parser) decodeString(iv int64, ep int) (Node, types.ParsingError) {
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p := self.p - 1
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s := self.s[iv:p]
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/* fast path: no escape sequence */
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if ep == -1 {
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return NewString(s), 0
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}
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/* unquote the string */
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out, err := unquote(s)
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/* check for errors */
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if err != 0 {
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return Node{}, err
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} else {
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return newBytes(rt.Str2Mem(out)), 0
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}
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}
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/** Parser Interface **/
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func (self *Parser) Pos() int {
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return self.p
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}
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func (self *Parser) Parse() (Node, types.ParsingError) {
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switch val := self.decodeValue(); val.Vt {
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case types.V_EOF : return Node{}, types.ERR_EOF
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case types.V_NULL : return nullNode, 0
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case types.V_TRUE : return trueNode, 0
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case types.V_FALSE : return falseNode, 0
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case types.V_STRING : return self.decodeString(val.Iv, val.Ep)
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case types.V_ARRAY:
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if p := skipBlank(self.s, self.p); p >= self.p && self.s[p] == ']' {
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self.p = p + 1
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return Node{t: types.V_ARRAY}, 0
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}
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if self.noLazy {
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return self.decodeArray(new(linkedNodes))
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}
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return newLazyArray(self), 0
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case types.V_OBJECT:
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if p := skipBlank(self.s, self.p); p >= self.p && self.s[p] == '}' {
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self.p = p + 1
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return Node{t: types.V_OBJECT}, 0
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}
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if self.noLazy {
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return self.decodeObject(new(linkedPairs))
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}
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return newLazyObject(self), 0
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case types.V_DOUBLE : return NewNumber(self.s[val.Ep:self.p]), 0
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case types.V_INTEGER : return NewNumber(self.s[val.Ep:self.p]), 0
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default : return Node{}, types.ParsingError(-val.Vt)
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}
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}
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func (self *Parser) searchKey(match string) types.ParsingError {
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ns := len(self.s)
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if err := self.object(); err != 0 {
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return err
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}
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/* check for EOF */
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if self.p = self.lspace(self.p); self.p >= ns {
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return types.ERR_EOF
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}
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/* check for empty object */
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if self.s[self.p] == '}' {
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self.p++
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return _ERR_NOT_FOUND
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}
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var njs types.JsonState
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var err types.ParsingError
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/* decode each pair */
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for {
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/* decode the key */
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if njs = self.decodeValue(); njs.Vt != types.V_STRING {
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return types.ERR_INVALID_CHAR
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}
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/* extract the key */
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idx := self.p - 1
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key := self.s[njs.Iv:idx]
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/* check for escape sequence */
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if njs.Ep != -1 {
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if key, err = unquote(key); err != 0 {
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return err
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}
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}
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/* expect a ':' delimiter */
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if err = self.delim(); err != 0 {
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return err
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}
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/* skip value */
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if key != match {
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if _, err = self.skipFast(); err != 0 {
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return err
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}
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} else {
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return 0
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}
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/* check for EOF */
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self.p = self.lspace(self.p)
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if self.p >= ns {
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return types.ERR_EOF
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}
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/* check for the next character */
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switch self.s[self.p] {
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case ',':
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self.p++
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case '}':
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self.p++
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return _ERR_NOT_FOUND
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default:
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return types.ERR_INVALID_CHAR
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}
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}
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}
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func (self *Parser) searchIndex(idx int) types.ParsingError {
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ns := len(self.s)
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if err := self.array(); err != 0 {
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return err
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}
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/* check for EOF */
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if self.p = self.lspace(self.p); self.p >= ns {
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return types.ERR_EOF
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}
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/* check for empty array */
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if self.s[self.p] == ']' {
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self.p++
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return _ERR_NOT_FOUND
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}
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var err types.ParsingError
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/* allocate array space and parse every element */
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for i := 0; i < idx; i++ {
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/* decode the value */
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if _, err = self.skipFast(); err != 0 {
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return err
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}
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/* check for EOF */
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self.p = self.lspace(self.p)
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if self.p >= ns {
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return types.ERR_EOF
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}
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/* check for the next character */
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switch self.s[self.p] {
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case ',':
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self.p++
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case ']':
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self.p++
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return _ERR_NOT_FOUND
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default:
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return types.ERR_INVALID_CHAR
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}
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}
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return 0
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}
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func (self *Node) skipNextNode() *Node {
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if !self.isLazy() {
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return nil
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}
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parser, stack := self.getParserAndArrayStack()
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ret := &stack.v
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sp := parser.p
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ns := len(parser.s)
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/* check for EOF */
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if parser.p = parser.lspace(sp); parser.p >= ns {
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return newSyntaxError(parser.syntaxError(types.ERR_EOF))
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}
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/* check for empty array */
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if parser.s[parser.p] == ']' {
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parser.p++
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self.setArray(ret)
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return nil
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}
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var val Node
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/* skip the value */
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if start, err := parser.skipFast(); err != 0 {
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return newSyntaxError(parser.syntaxError(err))
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} else {
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t := switchRawType(parser.s[start])
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if t == _V_NONE {
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return newSyntaxError(parser.syntaxError(types.ERR_INVALID_CHAR))
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}
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val = newRawNode(parser.s[start:parser.p], t)
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}
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/* add the value to result */
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ret.Push(val)
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self.l++
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parser.p = parser.lspace(parser.p)
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/* check for EOF */
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if parser.p >= ns {
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return newSyntaxError(parser.syntaxError(types.ERR_EOF))
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}
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/* check for the next character */
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switch parser.s[parser.p] {
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case ',':
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parser.p++
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return ret.At(ret.Len()-1)
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case ']':
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parser.p++
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self.setArray(ret)
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return ret.At(ret.Len()-1)
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default:
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return newSyntaxError(parser.syntaxError(types.ERR_INVALID_CHAR))
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}
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}
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func (self *Node) skipNextPair() (*Pair) {
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if !self.isLazy() {
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return nil
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}
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parser, stack := self.getParserAndObjectStack()
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ret := &stack.v
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sp := parser.p
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ns := len(parser.s)
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/* check for EOF */
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if parser.p = parser.lspace(sp); parser.p >= ns {
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return &Pair{"", *newSyntaxError(parser.syntaxError(types.ERR_EOF))}
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}
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/* check for empty object */
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if parser.s[parser.p] == '}' {
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parser.p++
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self.setObject(ret)
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return nil
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}
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/* decode one pair */
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var val Node
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var njs types.JsonState
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var err types.ParsingError
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/* decode the key */
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if njs = parser.decodeValue(); njs.Vt != types.V_STRING {
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return &Pair{"", *newSyntaxError(parser.syntaxError(types.ERR_INVALID_CHAR))}
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}
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/* extract the key */
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idx := parser.p - 1
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key := parser.s[njs.Iv:idx]
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/* check for escape sequence */
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if njs.Ep != -1 {
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if key, err = unquote(key); err != 0 {
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return &Pair{key, *newSyntaxError(parser.syntaxError(err))}
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}
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}
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/* expect a ':' delimiter */
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if err = parser.delim(); err != 0 {
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return &Pair{key, *newSyntaxError(parser.syntaxError(err))}
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}
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/* skip the value */
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if start, err := parser.skipFast(); err != 0 {
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return &Pair{key, *newSyntaxError(parser.syntaxError(err))}
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} else {
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t := switchRawType(parser.s[start])
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if t == _V_NONE {
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return &Pair{key, *newSyntaxError(parser.syntaxError(types.ERR_INVALID_CHAR))}
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}
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val = newRawNode(parser.s[start:parser.p], t)
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}
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/* add the value to result */
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ret.Push(Pair{Key: key, Value: val})
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self.l++
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parser.p = parser.lspace(parser.p)
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/* check for EOF */
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if parser.p >= ns {
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return &Pair{key, *newSyntaxError(parser.syntaxError(types.ERR_EOF))}
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}
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/* check for the next character */
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switch parser.s[parser.p] {
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case ',':
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parser.p++
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return ret.At(ret.Len()-1)
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case '}':
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parser.p++
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self.setObject(ret)
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return ret.At(ret.Len()-1)
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default:
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return &Pair{key, *newSyntaxError(parser.syntaxError(types.ERR_INVALID_CHAR))}
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}
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}
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/** Parser Factory **/
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// Loads parse all json into interface{}
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func Loads(src string) (int, interface{}, error) {
|
|
ps := &Parser{s: src}
|
|
np, err := ps.Parse()
|
|
|
|
/* check for errors */
|
|
if err != 0 {
|
|
return 0, nil, ps.ExportError(err)
|
|
} else {
|
|
x, err := np.Interface()
|
|
if err != nil {
|
|
return 0, nil, err
|
|
}
|
|
return ps.Pos(), x, nil
|
|
}
|
|
}
|
|
|
|
// LoadsUseNumber parse all json into interface{}, with numeric nodes casted to json.Number
|
|
func LoadsUseNumber(src string) (int, interface{}, error) {
|
|
ps := &Parser{s: src}
|
|
np, err := ps.Parse()
|
|
|
|
/* check for errors */
|
|
if err != 0 {
|
|
return 0, nil, err
|
|
} else {
|
|
x, err := np.InterfaceUseNumber()
|
|
if err != nil {
|
|
return 0, nil, err
|
|
}
|
|
return ps.Pos(), x, nil
|
|
}
|
|
}
|
|
|
|
// NewParser returns pointer of new allocated parser
|
|
func NewParser(src string) *Parser {
|
|
return &Parser{s: src}
|
|
}
|
|
|
|
// NewParser returns new allocated parser
|
|
func NewParserObj(src string) Parser {
|
|
return Parser{s: src}
|
|
}
|
|
|
|
// decodeNumber controls if parser decodes the number values instead of skip them
|
|
// WARN: once you set decodeNumber(true), please set decodeNumber(false) before you drop the parser
|
|
// otherwise the memory CANNOT be reused
|
|
func (self *Parser) decodeNumber(decode bool) {
|
|
if !decode && self.dbuf != nil {
|
|
types.FreeDbuf(self.dbuf)
|
|
self.dbuf = nil
|
|
return
|
|
}
|
|
if decode && self.dbuf == nil {
|
|
self.dbuf = types.NewDbuf()
|
|
}
|
|
}
|
|
|
|
// ExportError converts types.ParsingError to std Error
|
|
func (self *Parser) ExportError(err types.ParsingError) error {
|
|
if err == _ERR_NOT_FOUND {
|
|
return ErrNotExist
|
|
}
|
|
return fmt.Errorf("%q", SyntaxError{
|
|
Pos : self.p,
|
|
Src : self.s,
|
|
Code: err,
|
|
}.Description())
|
|
}
|