mirror of https://github.com/goccy/go-json.git
Add internal/vm package
This commit is contained in:
Masaaki Goshima
parent
2385cfcdbf
commit
c45f1e8b2c
4
Makefile
4
Makefile
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@ -26,3 +26,7 @@ golangci-lint: | $(BIN_DIR)
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GOBIN=$(BIN_DIR) go get github.com/golangci/golangci-lint/cmd/golangci-lint@v1.36.0; \
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rm -rf $$GOLANGCI_LINT_TMP_DIR; \
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}
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.PHONY: generate
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generate:
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go generate ./internal/...
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@ -12,6 +12,8 @@ import (
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"strings"
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"sync"
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"unsafe"
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_ "github.com/goccy/go-json/internal/encoder/vm"
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)
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// An Encoder writes JSON values to an output stream.
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@ -66,18 +66,18 @@ func createOpType(op, code string) opType {
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}
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func _main() error {
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tmpl, err := template.New("").Parse(`// Code generated by cmd/generator. DO NOT EDIT!
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package json
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tmpl, err := template.New("").Parse(`// Code generated by internal/cmd/generator. DO NOT EDIT!
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package encoder
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import (
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"strings"
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)
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type codeType int
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type CodeType int
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const (
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{{- range $index, $type := .CodeTypes }}
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code{{ $type }} codeType = {{ $index }}
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Code{{ $type }} CodeType = {{ $index }}
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{{- end }}
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)
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@ -87,92 +87,86 @@ var opTypeStrings = [{{ .OpLen }}]string{
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{{- end }}
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}
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type opType int
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type OpType int
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const (
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{{- range $index, $type := .OpTypes }}
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op{{ $type.Op }} opType = {{ $index }}
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Op{{ $type.Op }} OpType = {{ $index }}
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{{- end }}
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)
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func (t opType) String() string {
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func (t OpType) String() string {
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if int(t) >= {{ .OpLen }} {
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return ""
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}
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return opTypeStrings[int(t)]
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}
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func (t opType) codeType() codeType {
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func (t OpType) CodeType() CodeType {
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if strings.Contains(t.String(), "Struct") {
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if strings.Contains(t.String(), "End") {
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return codeStructEnd
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return CodeStructEnd
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}
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return codeStructField
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return CodeStructField
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}
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if t.String() == "Array" || t.String() == "ArrayPtr" {
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return codeArrayHead
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}
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if strings.Contains(t.String(), "ArrayElem") {
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return codeArrayElem
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}
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if t.String() == "Slice" || t.String() == "SlicePtr" {
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return codeSliceHead
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}
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if strings.Contains(t.String(), "SliceElem") {
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return codeSliceElem
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}
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if t.String() == "Map" || t.String() == "MapPtr" {
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return codeMapHead
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}
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if strings.Contains(t.String(), "MapKey") {
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return codeMapKey
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}
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if strings.Contains(t.String(), "MapValue") {
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return codeMapValue
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}
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if strings.Contains(t.String(), "MapEnd") {
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return codeMapEnd
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switch t {
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case OpArray, OpArrayPtr:
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return CodeArrayHead
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case OpArrayElem:
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return CodeArrayElem
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case OpSlice, OpSlicePtr:
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return CodeSliceHead
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case OpSliceElem:
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return CodeSliceElem
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case OpMap, OpMapPtr:
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return CodeMapHead
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case OpMapKey:
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return CodeMapKey
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case OpMapValue:
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return CodeMapValue
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case OpMapEnd:
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return CodeMapEnd
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}
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return codeOp
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return CodeOp
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}
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func (t opType) headToPtrHead() opType {
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func (t OpType) HeadToPtrHead() OpType {
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if strings.Index(t.String(), "PtrHead") > 0 {
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return t
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}
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idx := strings.Index(t.String(), "Field")
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idx := strings.Index(t.String(), "Head")
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if idx == -1 {
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return t
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}
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suffix := "Ptr"+t.String()[idx+len("Field"):]
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suffix := "Ptr"+t.String()[idx+len("Head"):]
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const toPtrOffset = 3
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if strings.Contains(opType(int(t) + toPtrOffset).String(), suffix) {
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return opType(int(t) + toPtrOffset)
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if strings.Contains(OpType(int(t) + toPtrOffset).String(), suffix) {
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return OpType(int(t) + toPtrOffset)
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}
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return t
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}
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func (t opType) headToOmitEmptyHead() opType {
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func (t OpType) HeadToOmitEmptyHead() OpType {
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const toOmitEmptyOffset = 1
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if strings.Contains(opType(int(t) + toOmitEmptyOffset).String(), "OmitEmpty") {
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return opType(int(t) + toOmitEmptyOffset)
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if strings.Contains(OpType(int(t) + toOmitEmptyOffset).String(), "OmitEmpty") {
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return OpType(int(t) + toOmitEmptyOffset)
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}
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return t
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}
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func (t opType) headToStringTagHead() opType {
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func (t OpType) HeadToStringTagHead() OpType {
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const toStringTagOffset = 2
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if strings.Contains(opType(int(t) + toStringTagOffset).String(), "StringTag") {
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return opType(int(t) + toStringTagOffset)
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if strings.Contains(OpType(int(t) + toStringTagOffset).String(), "StringTag") {
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return OpType(int(t) + toStringTagOffset)
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}
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return t
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}
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func (t opType) ptrHeadToHead() opType {
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func (t OpType) PtrHeadToHead() OpType {
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idx := strings.Index(t.String(), "Ptr")
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if idx == -1 {
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return t
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@ -180,36 +174,37 @@ func (t opType) ptrHeadToHead() opType {
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suffix := t.String()[idx+len("Ptr"):]
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const toPtrOffset = 3
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if strings.Contains(opType(int(t) - toPtrOffset).String(), suffix) {
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return opType(int(t) - toPtrOffset)
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if strings.Contains(OpType(int(t) - toPtrOffset).String(), suffix) {
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return OpType(int(t) - toPtrOffset)
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}
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return t
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}
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func (t opType) fieldToEnd() opType {
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switch t {
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{{- range $type := .OpTypes }}
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{{- if $type.IsFieldToEnd }}
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case op{{ $type.Op }}:
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return op{{ call $type.FieldToEnd }}
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{{- end }}
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{{- end }}
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func (t OpType) FieldToEnd() OpType {
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idx := strings.Index(t.String(), "Field")
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if idx == -1 {
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return t
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}
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suffix := t.String()[idx+len("Field"):]
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const toEndOffset = 3
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if strings.Contains(OpType(int(t) + toEndOffset).String(), "End"+suffix) {
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return OpType(int(t) + toEndOffset)
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}
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return t
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}
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func (t opType) fieldToOmitEmptyField() opType {
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func (t OpType) FieldToOmitEmptyField() OpType {
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const toOmitEmptyOffset = 1
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if strings.Contains(opType(int(t) + toOmitEmptyOffset).String(), "OmitEmpty") {
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return opType(int(t) + toOmitEmptyOffset)
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if strings.Contains(OpType(int(t) + toOmitEmptyOffset).String(), "OmitEmpty") {
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return OpType(int(t) + toOmitEmptyOffset)
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}
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return t
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}
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func (t opType) fieldToStringTagField() opType {
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func (t OpType) FieldToStringTagField() OpType {
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const toStringTagOffset = 2
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if strings.Contains(opType(int(t) + toStringTagOffset).String(), "StringTag") {
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return opType(int(t) + toStringTagOffset)
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if strings.Contains(OpType(int(t) + toStringTagOffset).String(), "StringTag") {
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return OpType(int(t) + toStringTagOffset)
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}
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return t
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}
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@ -269,7 +264,7 @@ func (t opType) fieldToStringTagField() opType {
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typ := typ
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op := fmt.Sprintf(
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"StructField%sHead%s%s",
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"Struct%sHead%s%s",
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ptrOrNot,
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opt,
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typ,
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@ -279,28 +274,28 @@ func (t opType) fieldToStringTagField() opType {
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Code: "StructField",
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HeadToPtrHead: func() string {
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return fmt.Sprintf(
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"StructFieldPtrHead%s%s",
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"StructPtrHead%s%s",
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opt,
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typ,
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)
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},
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HeadToOmitEmptyHead: func() string {
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return fmt.Sprintf(
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"StructField%sHeadOmitEmpty%s",
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"Struct%sHeadOmitEmpty%s",
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ptrOrNot,
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typ,
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)
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},
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HeadToStringTagHead: func() string {
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return fmt.Sprintf(
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"StructField%sHeadStringTag%s",
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"Struct%sHeadStringTag%s",
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ptrOrNot,
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typ,
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)
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},
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PtrHeadToHead: func() string {
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return fmt.Sprintf(
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"StructFieldHead%s%s",
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"StructHead%s%s",
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opt,
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typ,
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)
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@ -354,8 +349,6 @@ func (t opType) fieldToStringTagField() opType {
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},
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})
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}
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}
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for _, typ := range append(primitiveTypesUpper, "") {
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for _, opt := range []string{"", "OmitEmpty", "StringTag"} {
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opt := opt
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typ := typ
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@ -390,7 +383,7 @@ func (t opType) fieldToStringTagField() opType {
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}); err != nil {
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return err
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}
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path := filepath.Join(repoRoot(), "encode_optype.go")
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path := filepath.Join(repoRoot(), "internal", "encoder", "optype.go")
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buf, err := format.Source(b.Bytes())
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if err != nil {
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return err
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@ -400,10 +393,11 @@ func (t opType) fieldToStringTagField() opType {
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func repoRoot() string {
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_, file, _, _ := runtime.Caller(0)
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relativePathFromRepoRoot := filepath.Join("cmd", "generator")
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relativePathFromRepoRoot := filepath.Join("internal", "cmd", "generator")
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return strings.TrimSuffix(filepath.Dir(file), relativePathFromRepoRoot)
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}
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//go:generate go run main.go
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func main() {
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if err := _main(); err != nil {
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panic(err)
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@ -0,0 +1 @@
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package compiler
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@ -0,0 +1,11 @@
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// +build !race
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package compiler
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import (
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"github.com/goccy/go-json/internal/encoder"
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)
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func CompileToGetCodeSet(typeptr uintptr) (*encoder.OpcodeSet, error) {
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return nil, nil
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}
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@ -0,0 +1,407 @@
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package encoder
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import (
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"bytes"
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"encoding"
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"encoding/base64"
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"encoding/json"
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"fmt"
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"math"
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"reflect"
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"strconv"
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"sync"
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"unsafe"
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"github.com/goccy/go-json/internal/errors"
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"github.com/goccy/go-json/internal/runtime"
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)
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type Option int
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const (
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HTMLEscapeOption Option = 1 << iota
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IndentOption
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UnorderedMapOption
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)
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type Opcode struct {
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Op OpType // operation type
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Type *runtime.Type // go type
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DisplayIdx int // opcode index
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Key []byte // struct field key
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EscapedKey []byte // struct field key ( HTML escaped )
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PtrNum int // pointer number: e.g. double pointer is 2.
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DisplayKey string // key text to display
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IsTaggedKey bool // whether tagged key
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AnonymousKey bool // whether anonymous key
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AnonymousHead bool // whether anonymous head or not
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Indirect bool // whether indirect or not
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Nilcheck bool // whether needs to nilcheck or not
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AddrForMarshaler bool // whether needs to addr for marshaler or not
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RshiftNum uint8 // use to take bit for judging whether negative integer or not
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Mask uint64 // mask for number
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Indent int // indent number
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Idx uintptr // offset to access ptr
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HeadIdx uintptr // offset to access slice/struct head
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ElemIdx uintptr // offset to access array/slice/map elem
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Length uintptr // offset to access slice/map length or array length
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MapIter uintptr // offset to access map iterator
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MapPos uintptr // offset to access position list for sorted map
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Offset uintptr // offset size from struct header
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Size uintptr // array/slice elem size
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MapKey *Opcode // map key
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MapValue *Opcode // map value
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Elem *Opcode // array/slice elem
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End *Opcode // array/slice/struct/map end
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PrevField *Opcode // prev struct field
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NextField *Opcode // next struct field
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Next *Opcode // next opcode
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Jmp *CompiledCode // for recursive call
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}
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type OpcodeSet struct {
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Code *Opcode
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CodeLength int
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}
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type CompiledCode struct {
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Code *Opcode
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Linked bool // whether recursive code already have linked
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CurLen uintptr
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NextLen uintptr
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}
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const StartDetectingCyclesAfter = 1000
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func Load(base uintptr, idx uintptr) uintptr {
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addr := base + idx
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return **(**uintptr)(unsafe.Pointer(&addr))
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}
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func Store(base uintptr, idx uintptr, p uintptr) {
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addr := base + idx
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**(**uintptr)(unsafe.Pointer(&addr)) = p
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}
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func LoadAndStoreNPtr(base uintptr, idx uintptr, ptrNum int) {
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addr := base + idx
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p := **(**uintptr)(unsafe.Pointer(&addr))
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for i := 0; i < ptrNum; i++ {
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if p == 0 {
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**(**uintptr)(unsafe.Pointer(&addr)) = 0
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return
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}
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p = PtrToPtr(p)
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}
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**(**uintptr)(unsafe.Pointer(&addr)) = p
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}
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func PtrToUint64(p uintptr) uint64 { return **(**uint64)(unsafe.Pointer(&p)) }
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func PtrToFloat32(p uintptr) float32 { return **(**float32)(unsafe.Pointer(&p)) }
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func PtrToFloat64(p uintptr) float64 { return **(**float64)(unsafe.Pointer(&p)) }
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func PtrToBool(p uintptr) bool { return **(**bool)(unsafe.Pointer(&p)) }
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func PtrToBytes(p uintptr) []byte { return **(**[]byte)(unsafe.Pointer(&p)) }
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func PtrToNumber(p uintptr) json.Number { return **(**json.Number)(unsafe.Pointer(&p)) }
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func PtrToString(p uintptr) string { return **(**string)(unsafe.Pointer(&p)) }
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func PtrToSlice(p uintptr) *runtime.SliceHeader { return *(**runtime.SliceHeader)(unsafe.Pointer(&p)) }
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func PtrToPtr(p uintptr) uintptr {
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return uintptr(**(**unsafe.Pointer)(unsafe.Pointer(&p)))
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}
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func PtrToNPtr(p uintptr, ptrNum int) uintptr {
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for i := 0; i < ptrNum; i++ {
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if p == 0 {
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return 0
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}
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p = PtrToPtr(p)
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}
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return p
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}
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func PtrToUnsafePtr(p uintptr) unsafe.Pointer {
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return *(*unsafe.Pointer)(unsafe.Pointer(&p))
|
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}
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func PtrToInterface(code *Opcode, p uintptr) interface{} {
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return *(*interface{})(unsafe.Pointer(&emptyInterface{
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typ: code.Type,
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ptr: *(*unsafe.Pointer)(unsafe.Pointer(&p)),
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}))
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}
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func ErrUnsupportedValue(code *Opcode, ptr uintptr) *errors.UnsupportedValueError {
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v := *(*interface{})(unsafe.Pointer(&emptyInterface{
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typ: code.Type,
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ptr: *(*unsafe.Pointer)(unsafe.Pointer(&ptr)),
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}))
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return &errors.UnsupportedValueError{
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Value: reflect.ValueOf(v),
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Str: fmt.Sprintf("encountered a cycle via %s", code.Type),
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}
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}
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func ErrUnsupportedFloat(v float64) *errors.UnsupportedValueError {
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return &errors.UnsupportedValueError{
|
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Value: reflect.ValueOf(v),
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Str: strconv.FormatFloat(v, 'g', -1, 64),
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}
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}
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func ErrMarshalerWithCode(code *Opcode, err error) *errors.MarshalerError {
|
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return &errors.MarshalerError{
|
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Type: runtime.RType2Type(code.Type),
|
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Err: err,
|
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}
|
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}
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type emptyInterface struct {
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typ *runtime.Type
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ptr unsafe.Pointer
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}
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type MapItem struct {
|
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Key []byte
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Value []byte
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}
|
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|
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type Mapslice struct {
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Items []MapItem
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}
|
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|
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func (m *Mapslice) Len() int {
|
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return len(m.Items)
|
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}
|
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|
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func (m *Mapslice) Less(i, j int) bool {
|
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return bytes.Compare(m.Items[i].Key, m.Items[j].Key) < 0
|
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}
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func (m *Mapslice) Swap(i, j int) {
|
||||
m.Items[i], m.Items[j] = m.Items[j], m.Items[i]
|
||||
}
|
||||
|
||||
type MapContext struct {
|
||||
Pos []int
|
||||
Slice *Mapslice
|
||||
Buf []byte
|
||||
}
|
||||
|
||||
var mapContextPool = sync.Pool{
|
||||
New: func() interface{} {
|
||||
return &MapContext{}
|
||||
},
|
||||
}
|
||||
|
||||
func NewMapContext(mapLen int) *MapContext {
|
||||
ctx := mapContextPool.Get().(*MapContext)
|
||||
if ctx.Slice == nil {
|
||||
ctx.Slice = &Mapslice{
|
||||
Items: make([]MapItem, 0, mapLen),
|
||||
}
|
||||
}
|
||||
if cap(ctx.Pos) < (mapLen*2 + 1) {
|
||||
ctx.Pos = make([]int, 0, mapLen*2+1)
|
||||
ctx.Slice.Items = make([]MapItem, 0, mapLen)
|
||||
} else {
|
||||
ctx.Pos = ctx.Pos[:0]
|
||||
ctx.Slice.Items = ctx.Slice.Items[:0]
|
||||
}
|
||||
ctx.Buf = ctx.Buf[:0]
|
||||
return ctx
|
||||
}
|
||||
|
||||
func ReleaseMapContext(c *MapContext) {
|
||||
mapContextPool.Put(c)
|
||||
}
|
||||
|
||||
//go:linkname MapIterInit reflect.mapiterinit
|
||||
//go:noescape
|
||||
func MapIterInit(mapType *runtime.Type, m unsafe.Pointer) unsafe.Pointer
|
||||
|
||||
//go:linkname MapIterKey reflect.mapiterkey
|
||||
//go:noescape
|
||||
func MapIterKey(it unsafe.Pointer) unsafe.Pointer
|
||||
|
||||
//go:linkname MapIterNext reflect.mapiternext
|
||||
//go:noescape
|
||||
func MapIterNext(it unsafe.Pointer)
|
||||
|
||||
//go:linkname MapLen reflect.maplen
|
||||
//go:noescape
|
||||
func MapLen(m unsafe.Pointer) int
|
||||
|
||||
type RuntimeContext struct {
|
||||
Buf []byte
|
||||
Ptrs []uintptr
|
||||
KeepRefs []unsafe.Pointer
|
||||
SeenPtr []uintptr
|
||||
BaseIndent int
|
||||
Prefix []byte
|
||||
IndentStr []byte
|
||||
}
|
||||
|
||||
func (c *RuntimeContext) Init(p uintptr, codelen int) {
|
||||
if len(c.Ptrs) < codelen {
|
||||
c.Ptrs = make([]uintptr, codelen)
|
||||
}
|
||||
c.Ptrs[0] = p
|
||||
c.KeepRefs = c.KeepRefs[:0]
|
||||
c.SeenPtr = c.SeenPtr[:0]
|
||||
c.BaseIndent = 0
|
||||
}
|
||||
|
||||
func (c *RuntimeContext) Ptr() uintptr {
|
||||
header := (*runtime.SliceHeader)(unsafe.Pointer(&c.Ptrs))
|
||||
return uintptr(header.Data)
|
||||
}
|
||||
|
||||
func AppendByteSlice(b []byte, src []byte) []byte {
|
||||
if src == nil {
|
||||
return append(b, `null`...)
|
||||
}
|
||||
encodedLen := base64.StdEncoding.EncodedLen(len(src))
|
||||
b = append(b, '"')
|
||||
pos := len(b)
|
||||
remainLen := cap(b[pos:])
|
||||
var buf []byte
|
||||
if remainLen > encodedLen {
|
||||
buf = b[pos : pos+encodedLen]
|
||||
} else {
|
||||
buf = make([]byte, encodedLen)
|
||||
}
|
||||
base64.StdEncoding.Encode(buf, src)
|
||||
return append(append(b, buf...), '"')
|
||||
}
|
||||
|
||||
func AppendFloat32(b []byte, v float32) []byte {
|
||||
f64 := float64(v)
|
||||
abs := math.Abs(f64)
|
||||
fmt := byte('f')
|
||||
// Note: Must use float32 comparisons for underlying float32 value to get precise cutoffs right.
|
||||
if abs != 0 {
|
||||
f32 := float32(abs)
|
||||
if f32 < 1e-6 || f32 >= 1e21 {
|
||||
fmt = 'e'
|
||||
}
|
||||
}
|
||||
return strconv.AppendFloat(b, f64, fmt, -1, 32)
|
||||
}
|
||||
|
||||
func AppendFloat64(b []byte, v float64) []byte {
|
||||
abs := math.Abs(v)
|
||||
fmt := byte('f')
|
||||
// Note: Must use float32 comparisons for underlying float32 value to get precise cutoffs right.
|
||||
if abs != 0 {
|
||||
if abs < 1e-6 || abs >= 1e21 {
|
||||
fmt = 'e'
|
||||
}
|
||||
}
|
||||
return strconv.AppendFloat(b, v, fmt, -1, 64)
|
||||
}
|
||||
|
||||
func AppendBool(b []byte, v bool) []byte {
|
||||
if v {
|
||||
return append(b, "true"...)
|
||||
}
|
||||
return append(b, "false"...)
|
||||
}
|
||||
|
||||
var (
|
||||
floatTable = [256]bool{
|
||||
'0': true,
|
||||
'1': true,
|
||||
'2': true,
|
||||
'3': true,
|
||||
'4': true,
|
||||
'5': true,
|
||||
'6': true,
|
||||
'7': true,
|
||||
'8': true,
|
||||
'9': true,
|
||||
'.': true,
|
||||
'e': true,
|
||||
'E': true,
|
||||
'+': true,
|
||||
'-': true,
|
||||
}
|
||||
)
|
||||
|
||||
func AppendNumber(b []byte, n json.Number) ([]byte, error) {
|
||||
if len(n) == 0 {
|
||||
return append(b, '0'), nil
|
||||
}
|
||||
for i := 0; i < len(n); i++ {
|
||||
if !floatTable[n[i]] {
|
||||
return nil, fmt.Errorf("json: invalid number literal %q", n)
|
||||
}
|
||||
}
|
||||
b = append(b, n...)
|
||||
return b, nil
|
||||
}
|
||||
|
||||
func AppendMarshalJSON(code *Opcode, b []byte, v interface{}, escape bool) ([]byte, error) {
|
||||
rv := reflect.ValueOf(v) // convert by dynamic interface type
|
||||
if code.AddrForMarshaler {
|
||||
if rv.CanAddr() {
|
||||
rv = rv.Addr()
|
||||
} else {
|
||||
newV := reflect.New(rv.Type())
|
||||
newV.Elem().Set(rv)
|
||||
rv = newV
|
||||
}
|
||||
}
|
||||
v = rv.Interface()
|
||||
marshaler, ok := v.(json.Marshaler)
|
||||
if !ok {
|
||||
return AppendNull(b), nil
|
||||
}
|
||||
bb, err := marshaler.MarshalJSON()
|
||||
if err != nil {
|
||||
return nil, &errors.MarshalerError{Type: reflect.TypeOf(v), Err: err}
|
||||
}
|
||||
return bb, nil
|
||||
//buf := bytes.NewBuffer(b)
|
||||
//TODO: we should validate buffer with `compact`
|
||||
// if err := compact(buf, bb, escape); err != nil {
|
||||
// return nil, &errors.MarshalerError{Type: reflect.TypeOf(v), Err: err}
|
||||
// }
|
||||
//return buf.Bytes(), nil
|
||||
}
|
||||
|
||||
func AppendMarshalText(code *Opcode, b []byte, v interface{}, escape bool) ([]byte, error) {
|
||||
rv := reflect.ValueOf(v) // convert by dynamic interface type
|
||||
if code.AddrForMarshaler {
|
||||
if rv.CanAddr() {
|
||||
rv = rv.Addr()
|
||||
} else {
|
||||
newV := reflect.New(rv.Type())
|
||||
newV.Elem().Set(rv)
|
||||
rv = newV
|
||||
}
|
||||
}
|
||||
v = rv.Interface()
|
||||
marshaler, ok := v.(encoding.TextMarshaler)
|
||||
if !ok {
|
||||
return AppendNull(b), nil
|
||||
}
|
||||
bytes, err := marshaler.MarshalText()
|
||||
if err != nil {
|
||||
return nil, &errors.MarshalerError{Type: reflect.TypeOf(v), Err: err}
|
||||
}
|
||||
if escape {
|
||||
return AppendEscapedString(b, *(*string)(unsafe.Pointer(&bytes))), nil
|
||||
}
|
||||
return AppendString(b, *(*string)(unsafe.Pointer(&bytes))), nil
|
||||
}
|
||||
|
||||
func AppendNull(b []byte) []byte {
|
||||
return append(b, "null"...)
|
||||
}
|
||||
|
||||
func AppendComma(b []byte) []byte {
|
||||
return append(b, ',')
|
||||
}
|
||||
|
||||
func AppendStructEnd(b []byte) []byte {
|
||||
return append(b, '}', ',')
|
||||
}
|
||||
|
|
@ -0,0 +1,124 @@
|
|||
package encoder
|
||||
|
||||
import (
|
||||
"unsafe"
|
||||
)
|
||||
|
||||
var endianness int
|
||||
|
||||
func init() {
|
||||
var b [2]byte
|
||||
*(*uint16)(unsafe.Pointer(&b)) = uint16(0xABCD)
|
||||
|
||||
switch b[0] {
|
||||
case 0xCD:
|
||||
endianness = 0 // LE
|
||||
case 0xAB:
|
||||
endianness = 1 // BE
|
||||
default:
|
||||
panic("could not determine endianness")
|
||||
}
|
||||
}
|
||||
|
||||
// "00010203...96979899" cast to []uint16
|
||||
var intLELookup = [100]uint16{
|
||||
0x3030, 0x3130, 0x3230, 0x3330, 0x3430, 0x3530, 0x3630, 0x3730, 0x3830, 0x3930,
|
||||
0x3031, 0x3131, 0x3231, 0x3331, 0x3431, 0x3531, 0x3631, 0x3731, 0x3831, 0x3931,
|
||||
0x3032, 0x3132, 0x3232, 0x3332, 0x3432, 0x3532, 0x3632, 0x3732, 0x3832, 0x3932,
|
||||
0x3033, 0x3133, 0x3233, 0x3333, 0x3433, 0x3533, 0x3633, 0x3733, 0x3833, 0x3933,
|
||||
0x3034, 0x3134, 0x3234, 0x3334, 0x3434, 0x3534, 0x3634, 0x3734, 0x3834, 0x3934,
|
||||
0x3035, 0x3135, 0x3235, 0x3335, 0x3435, 0x3535, 0x3635, 0x3735, 0x3835, 0x3935,
|
||||
0x3036, 0x3136, 0x3236, 0x3336, 0x3436, 0x3536, 0x3636, 0x3736, 0x3836, 0x3936,
|
||||
0x3037, 0x3137, 0x3237, 0x3337, 0x3437, 0x3537, 0x3637, 0x3737, 0x3837, 0x3937,
|
||||
0x3038, 0x3138, 0x3238, 0x3338, 0x3438, 0x3538, 0x3638, 0x3738, 0x3838, 0x3938,
|
||||
0x3039, 0x3139, 0x3239, 0x3339, 0x3439, 0x3539, 0x3639, 0x3739, 0x3839, 0x3939,
|
||||
}
|
||||
|
||||
var intBELookup = [100]uint16{
|
||||
0x3030, 0x3031, 0x3032, 0x3033, 0x3034, 0x3035, 0x3036, 0x3037, 0x3038, 0x3039,
|
||||
0x3130, 0x3131, 0x3132, 0x3133, 0x3134, 0x3135, 0x3136, 0x3137, 0x3138, 0x3139,
|
||||
0x3230, 0x3231, 0x3232, 0x3233, 0x3234, 0x3235, 0x3236, 0x3237, 0x3238, 0x3239,
|
||||
0x3330, 0x3331, 0x3332, 0x3333, 0x3334, 0x3335, 0x3336, 0x3337, 0x3338, 0x3339,
|
||||
0x3430, 0x3431, 0x3432, 0x3433, 0x3434, 0x3435, 0x3436, 0x3437, 0x3438, 0x3439,
|
||||
0x3530, 0x3531, 0x3532, 0x3533, 0x3534, 0x3535, 0x3536, 0x3537, 0x3538, 0x3539,
|
||||
0x3630, 0x3631, 0x3632, 0x3633, 0x3634, 0x3635, 0x3636, 0x3637, 0x3638, 0x3639,
|
||||
0x3730, 0x3731, 0x3732, 0x3733, 0x3734, 0x3735, 0x3736, 0x3737, 0x3738, 0x3739,
|
||||
0x3830, 0x3831, 0x3832, 0x3833, 0x3834, 0x3835, 0x3836, 0x3837, 0x3838, 0x3839,
|
||||
0x3930, 0x3931, 0x3932, 0x3933, 0x3934, 0x3935, 0x3936, 0x3937, 0x3938, 0x3939,
|
||||
}
|
||||
|
||||
var intLookup = [2]*[100]uint16{&intLELookup, &intBELookup}
|
||||
|
||||
func AppendInt(out []byte, u64 uint64, code *Opcode) []byte {
|
||||
n := u64 & code.Mask
|
||||
negative := (u64>>code.RshiftNum)&1 == 1
|
||||
if !negative {
|
||||
if n < 10 {
|
||||
return append(out, byte(n+'0'))
|
||||
} else if n < 100 {
|
||||
u := intLELookup[n]
|
||||
return append(out, byte(u), byte(u>>8))
|
||||
}
|
||||
} else {
|
||||
n = -n & code.Mask
|
||||
}
|
||||
|
||||
lookup := intLookup[endianness]
|
||||
|
||||
var b [22]byte
|
||||
u := (*[11]uint16)(unsafe.Pointer(&b))
|
||||
i := 11
|
||||
|
||||
for n >= 100 {
|
||||
j := n % 100
|
||||
n /= 100
|
||||
i--
|
||||
u[i] = lookup[j]
|
||||
}
|
||||
|
||||
i--
|
||||
u[i] = lookup[n]
|
||||
|
||||
i *= 2 // convert to byte index
|
||||
if n < 10 {
|
||||
i++ // remove leading zero
|
||||
}
|
||||
if negative {
|
||||
i--
|
||||
b[i] = '-'
|
||||
}
|
||||
|
||||
return append(out, b[i:]...)
|
||||
}
|
||||
|
||||
func AppendUint(out []byte, u64 uint64, code *Opcode) []byte {
|
||||
n := u64 & code.Mask
|
||||
if n < 10 {
|
||||
return append(out, byte(n+'0'))
|
||||
} else if n < 100 {
|
||||
u := intLELookup[n]
|
||||
return append(out, byte(u), byte(u>>8))
|
||||
}
|
||||
|
||||
lookup := intLookup[endianness]
|
||||
|
||||
var b [22]byte
|
||||
u := (*[11]uint16)(unsafe.Pointer(&b))
|
||||
i := 11
|
||||
|
||||
for n >= 100 {
|
||||
j := n % 100
|
||||
n /= 100
|
||||
i--
|
||||
u[i] = lookup[j]
|
||||
}
|
||||
|
||||
i--
|
||||
u[i] = lookup[n]
|
||||
|
||||
i *= 2 // convert to byte index
|
||||
if n < 10 {
|
||||
i++ // remove leading zero
|
||||
}
|
||||
return append(out, b[i:]...)
|
||||
}
|
||||
|
|
@ -0,0 +1,8 @@
|
|||
// +build !go1.13
|
||||
|
||||
package encoder
|
||||
|
||||
import "unsafe"
|
||||
|
||||
//go:linkname MapIterValue reflect.mapitervalue
|
||||
func MapIterValue(it unsafe.Pointer) unsafe.Pointer
|
||||
|
|
@ -0,0 +1,8 @@
|
|||
// +build go1.13
|
||||
|
||||
package encoder
|
||||
|
||||
import "unsafe"
|
||||
|
||||
//go:linkname MapIterValue reflect.mapiterelem
|
||||
func MapIterValue(it unsafe.Pointer) unsafe.Pointer
|
||||
File diff suppressed because it is too large
Load Diff
|
|
@ -0,0 +1,637 @@
|
|||
package encoder
|
||||
|
||||
import (
|
||||
"math/bits"
|
||||
"reflect"
|
||||
"unicode/utf8"
|
||||
"unsafe"
|
||||
)
|
||||
|
||||
const (
|
||||
lsb = 0x0101010101010101
|
||||
msb = 0x8080808080808080
|
||||
)
|
||||
|
||||
var needEscapeWithHTML = [256]bool{
|
||||
'"': true,
|
||||
'&': true,
|
||||
'<': true,
|
||||
'>': true,
|
||||
'\\': true,
|
||||
0x00: true,
|
||||
0x01: true,
|
||||
0x02: true,
|
||||
0x03: true,
|
||||
0x04: true,
|
||||
0x05: true,
|
||||
0x06: true,
|
||||
0x07: true,
|
||||
0x08: true,
|
||||
0x09: true,
|
||||
0x0a: true,
|
||||
0x0b: true,
|
||||
0x0c: true,
|
||||
0x0d: true,
|
||||
0x0e: true,
|
||||
0x0f: true,
|
||||
0x10: true,
|
||||
0x11: true,
|
||||
0x12: true,
|
||||
0x13: true,
|
||||
0x14: true,
|
||||
0x15: true,
|
||||
0x16: true,
|
||||
0x17: true,
|
||||
0x18: true,
|
||||
0x19: true,
|
||||
0x1a: true,
|
||||
0x1b: true,
|
||||
0x1c: true,
|
||||
0x1d: true,
|
||||
0x1e: true,
|
||||
0x1f: true,
|
||||
/* 0x20 - 0x7f */
|
||||
0x80: true,
|
||||
0x81: true,
|
||||
0x82: true,
|
||||
0x83: true,
|
||||
0x84: true,
|
||||
0x85: true,
|
||||
0x86: true,
|
||||
0x87: true,
|
||||
0x88: true,
|
||||
0x89: true,
|
||||
0x8a: true,
|
||||
0x8b: true,
|
||||
0x8c: true,
|
||||
0x8d: true,
|
||||
0x8e: true,
|
||||
0x8f: true,
|
||||
0x90: true,
|
||||
0x91: true,
|
||||
0x92: true,
|
||||
0x93: true,
|
||||
0x94: true,
|
||||
0x95: true,
|
||||
0x96: true,
|
||||
0x97: true,
|
||||
0x98: true,
|
||||
0x99: true,
|
||||
0x9a: true,
|
||||
0x9b: true,
|
||||
0x9c: true,
|
||||
0x9d: true,
|
||||
0x9e: true,
|
||||
0x9f: true,
|
||||
0xa0: true,
|
||||
0xa1: true,
|
||||
0xa2: true,
|
||||
0xa3: true,
|
||||
0xa4: true,
|
||||
0xa5: true,
|
||||
0xa6: true,
|
||||
0xa7: true,
|
||||
0xa8: true,
|
||||
0xa9: true,
|
||||
0xaa: true,
|
||||
0xab: true,
|
||||
0xac: true,
|
||||
0xad: true,
|
||||
0xae: true,
|
||||
0xaf: true,
|
||||
0xb0: true,
|
||||
0xb1: true,
|
||||
0xb2: true,
|
||||
0xb3: true,
|
||||
0xb4: true,
|
||||
0xb5: true,
|
||||
0xb6: true,
|
||||
0xb7: true,
|
||||
0xb8: true,
|
||||
0xb9: true,
|
||||
0xba: true,
|
||||
0xbb: true,
|
||||
0xbc: true,
|
||||
0xbd: true,
|
||||
0xbe: true,
|
||||
0xbf: true,
|
||||
0xc0: true,
|
||||
0xc1: true,
|
||||
0xc2: true,
|
||||
0xc3: true,
|
||||
0xc4: true,
|
||||
0xc5: true,
|
||||
0xc6: true,
|
||||
0xc7: true,
|
||||
0xc8: true,
|
||||
0xc9: true,
|
||||
0xca: true,
|
||||
0xcb: true,
|
||||
0xcc: true,
|
||||
0xcd: true,
|
||||
0xce: true,
|
||||
0xcf: true,
|
||||
0xd0: true,
|
||||
0xd1: true,
|
||||
0xd2: true,
|
||||
0xd3: true,
|
||||
0xd4: true,
|
||||
0xd5: true,
|
||||
0xd6: true,
|
||||
0xd7: true,
|
||||
0xd8: true,
|
||||
0xd9: true,
|
||||
0xda: true,
|
||||
0xdb: true,
|
||||
0xdc: true,
|
||||
0xdd: true,
|
||||
0xde: true,
|
||||
0xdf: true,
|
||||
0xe0: true,
|
||||
0xe1: true,
|
||||
0xe2: true,
|
||||
0xe3: true,
|
||||
0xe4: true,
|
||||
0xe5: true,
|
||||
0xe6: true,
|
||||
0xe7: true,
|
||||
0xe8: true,
|
||||
0xe9: true,
|
||||
0xea: true,
|
||||
0xeb: true,
|
||||
0xec: true,
|
||||
0xed: true,
|
||||
0xee: true,
|
||||
0xef: true,
|
||||
0xf0: true,
|
||||
0xf1: true,
|
||||
0xf2: true,
|
||||
0xf3: true,
|
||||
0xf4: true,
|
||||
0xf5: true,
|
||||
0xf6: true,
|
||||
0xf7: true,
|
||||
0xf8: true,
|
||||
0xf9: true,
|
||||
0xfa: true,
|
||||
0xfb: true,
|
||||
0xfc: true,
|
||||
0xfd: true,
|
||||
0xfe: true,
|
||||
0xff: true,
|
||||
}
|
||||
|
||||
var needEscape = [256]bool{
|
||||
'"': true,
|
||||
'\\': true,
|
||||
0x00: true,
|
||||
0x01: true,
|
||||
0x02: true,
|
||||
0x03: true,
|
||||
0x04: true,
|
||||
0x05: true,
|
||||
0x06: true,
|
||||
0x07: true,
|
||||
0x08: true,
|
||||
0x09: true,
|
||||
0x0a: true,
|
||||
0x0b: true,
|
||||
0x0c: true,
|
||||
0x0d: true,
|
||||
0x0e: true,
|
||||
0x0f: true,
|
||||
0x10: true,
|
||||
0x11: true,
|
||||
0x12: true,
|
||||
0x13: true,
|
||||
0x14: true,
|
||||
0x15: true,
|
||||
0x16: true,
|
||||
0x17: true,
|
||||
0x18: true,
|
||||
0x19: true,
|
||||
0x1a: true,
|
||||
0x1b: true,
|
||||
0x1c: true,
|
||||
0x1d: true,
|
||||
0x1e: true,
|
||||
0x1f: true,
|
||||
/* 0x20 - 0x7f */
|
||||
0x80: true,
|
||||
0x81: true,
|
||||
0x82: true,
|
||||
0x83: true,
|
||||
0x84: true,
|
||||
0x85: true,
|
||||
0x86: true,
|
||||
0x87: true,
|
||||
0x88: true,
|
||||
0x89: true,
|
||||
0x8a: true,
|
||||
0x8b: true,
|
||||
0x8c: true,
|
||||
0x8d: true,
|
||||
0x8e: true,
|
||||
0x8f: true,
|
||||
0x90: true,
|
||||
0x91: true,
|
||||
0x92: true,
|
||||
0x93: true,
|
||||
0x94: true,
|
||||
0x95: true,
|
||||
0x96: true,
|
||||
0x97: true,
|
||||
0x98: true,
|
||||
0x99: true,
|
||||
0x9a: true,
|
||||
0x9b: true,
|
||||
0x9c: true,
|
||||
0x9d: true,
|
||||
0x9e: true,
|
||||
0x9f: true,
|
||||
0xa0: true,
|
||||
0xa1: true,
|
||||
0xa2: true,
|
||||
0xa3: true,
|
||||
0xa4: true,
|
||||
0xa5: true,
|
||||
0xa6: true,
|
||||
0xa7: true,
|
||||
0xa8: true,
|
||||
0xa9: true,
|
||||
0xaa: true,
|
||||
0xab: true,
|
||||
0xac: true,
|
||||
0xad: true,
|
||||
0xae: true,
|
||||
0xaf: true,
|
||||
0xb0: true,
|
||||
0xb1: true,
|
||||
0xb2: true,
|
||||
0xb3: true,
|
||||
0xb4: true,
|
||||
0xb5: true,
|
||||
0xb6: true,
|
||||
0xb7: true,
|
||||
0xb8: true,
|
||||
0xb9: true,
|
||||
0xba: true,
|
||||
0xbb: true,
|
||||
0xbc: true,
|
||||
0xbd: true,
|
||||
0xbe: true,
|
||||
0xbf: true,
|
||||
0xc0: true,
|
||||
0xc1: true,
|
||||
0xc2: true,
|
||||
0xc3: true,
|
||||
0xc4: true,
|
||||
0xc5: true,
|
||||
0xc6: true,
|
||||
0xc7: true,
|
||||
0xc8: true,
|
||||
0xc9: true,
|
||||
0xca: true,
|
||||
0xcb: true,
|
||||
0xcc: true,
|
||||
0xcd: true,
|
||||
0xce: true,
|
||||
0xcf: true,
|
||||
0xd0: true,
|
||||
0xd1: true,
|
||||
0xd2: true,
|
||||
0xd3: true,
|
||||
0xd4: true,
|
||||
0xd5: true,
|
||||
0xd6: true,
|
||||
0xd7: true,
|
||||
0xd8: true,
|
||||
0xd9: true,
|
||||
0xda: true,
|
||||
0xdb: true,
|
||||
0xdc: true,
|
||||
0xdd: true,
|
||||
0xde: true,
|
||||
0xdf: true,
|
||||
0xe0: true,
|
||||
0xe1: true,
|
||||
0xe2: true,
|
||||
0xe3: true,
|
||||
0xe4: true,
|
||||
0xe5: true,
|
||||
0xe6: true,
|
||||
0xe7: true,
|
||||
0xe8: true,
|
||||
0xe9: true,
|
||||
0xea: true,
|
||||
0xeb: true,
|
||||
0xec: true,
|
||||
0xed: true,
|
||||
0xee: true,
|
||||
0xef: true,
|
||||
0xf0: true,
|
||||
0xf1: true,
|
||||
0xf2: true,
|
||||
0xf3: true,
|
||||
0xf4: true,
|
||||
0xf5: true,
|
||||
0xf6: true,
|
||||
0xf7: true,
|
||||
0xf8: true,
|
||||
0xf9: true,
|
||||
0xfa: true,
|
||||
0xfb: true,
|
||||
0xfc: true,
|
||||
0xfd: true,
|
||||
0xfe: true,
|
||||
0xff: true,
|
||||
}
|
||||
|
||||
var hex = "0123456789abcdef"
|
||||
|
||||
// escapeIndex finds the index of the first char in `s` that requires escaping.
|
||||
// A char requires escaping if it's outside of the range of [0x20, 0x7F] or if
|
||||
// it includes a double quote or backslash.
|
||||
// If no chars in `s` require escaping, the return value is -1.
|
||||
func escapeIndex(s string) int {
|
||||
chunks := stringToUint64Slice(s)
|
||||
for _, n := range chunks {
|
||||
// combine masks before checking for the MSB of each byte. We include
|
||||
// `n` in the mask to check whether any of the *input* byte MSBs were
|
||||
// set (i.e. the byte was outside the ASCII range).
|
||||
mask := n | below(n, 0x20) | contains(n, '"') | contains(n, '\\')
|
||||
if (mask & msb) != 0 {
|
||||
return bits.TrailingZeros64(mask&msb) / 8
|
||||
}
|
||||
}
|
||||
|
||||
valLen := len(s)
|
||||
for i := len(chunks) * 8; i < valLen; i++ {
|
||||
if needEscape[s[i]] {
|
||||
return i
|
||||
}
|
||||
}
|
||||
|
||||
return -1
|
||||
}
|
||||
|
||||
// below return a mask that can be used to determine if any of the bytes
|
||||
// in `n` are below `b`. If a byte's MSB is set in the mask then that byte was
|
||||
// below `b`. The result is only valid if `b`, and each byte in `n`, is below
|
||||
// 0x80.
|
||||
func below(n uint64, b byte) uint64 {
|
||||
return n - expand(b)
|
||||
}
|
||||
|
||||
// contains returns a mask that can be used to determine if any of the
|
||||
// bytes in `n` are equal to `b`. If a byte's MSB is set in the mask then
|
||||
// that byte is equal to `b`. The result is only valid if `b`, and each
|
||||
// byte in `n`, is below 0x80.
|
||||
func contains(n uint64, b byte) uint64 {
|
||||
return (n ^ expand(b)) - lsb
|
||||
}
|
||||
|
||||
// expand puts the specified byte into each of the 8 bytes of a uint64.
|
||||
func expand(b byte) uint64 {
|
||||
return lsb * uint64(b)
|
||||
}
|
||||
|
||||
//nolint:govet
|
||||
func stringToUint64Slice(s string) []uint64 {
|
||||
return *(*[]uint64)(unsafe.Pointer(&reflect.SliceHeader{
|
||||
Data: ((*reflect.StringHeader)(unsafe.Pointer(&s))).Data,
|
||||
Len: len(s) / 8,
|
||||
Cap: len(s) / 8,
|
||||
}))
|
||||
}
|
||||
|
||||
func AppendEscapedString(buf []byte, s string) []byte {
|
||||
valLen := len(s)
|
||||
if valLen == 0 {
|
||||
return append(buf, `""`...)
|
||||
}
|
||||
buf = append(buf, '"')
|
||||
var (
|
||||
i, j int
|
||||
)
|
||||
if valLen >= 8 {
|
||||
chunks := stringToUint64Slice(s)
|
||||
for _, n := range chunks {
|
||||
// combine masks before checking for the MSB of each byte. We include
|
||||
// `n` in the mask to check whether any of the *input* byte MSBs were
|
||||
// set (i.e. the byte was outside the ASCII range).
|
||||
mask := n | (n - (lsb * 0x20)) |
|
||||
((n ^ (lsb * '"')) - lsb) |
|
||||
((n ^ (lsb * '\\')) - lsb) |
|
||||
((n ^ (lsb * '<')) - lsb) |
|
||||
((n ^ (lsb * '>')) - lsb) |
|
||||
((n ^ (lsb * '&')) - lsb)
|
||||
if (mask & msb) != 0 {
|
||||
j = bits.TrailingZeros64(mask&msb) / 8
|
||||
goto ESCAPE_END
|
||||
}
|
||||
}
|
||||
for i := len(chunks) * 8; i < valLen; i++ {
|
||||
if needEscapeWithHTML[s[i]] {
|
||||
j = i
|
||||
goto ESCAPE_END
|
||||
}
|
||||
}
|
||||
// no found any escape characters.
|
||||
return append(append(buf, s...), '"')
|
||||
}
|
||||
ESCAPE_END:
|
||||
for j < valLen {
|
||||
c := s[j]
|
||||
|
||||
if !needEscapeWithHTML[c] {
|
||||
// fast path: most of the time, printable ascii characters are used
|
||||
j++
|
||||
continue
|
||||
}
|
||||
|
||||
switch c {
|
||||
case '\\', '"':
|
||||
buf = append(buf, s[i:j]...)
|
||||
buf = append(buf, '\\', c)
|
||||
i = j + 1
|
||||
j = j + 1
|
||||
continue
|
||||
|
||||
case '\n':
|
||||
buf = append(buf, s[i:j]...)
|
||||
buf = append(buf, '\\', 'n')
|
||||
i = j + 1
|
||||
j = j + 1
|
||||
continue
|
||||
|
||||
case '\r':
|
||||
buf = append(buf, s[i:j]...)
|
||||
buf = append(buf, '\\', 'r')
|
||||
i = j + 1
|
||||
j = j + 1
|
||||
continue
|
||||
|
||||
case '\t':
|
||||
buf = append(buf, s[i:j]...)
|
||||
buf = append(buf, '\\', 't')
|
||||
i = j + 1
|
||||
j = j + 1
|
||||
continue
|
||||
|
||||
case '<', '>', '&':
|
||||
buf = append(buf, s[i:j]...)
|
||||
buf = append(buf, `\u00`...)
|
||||
buf = append(buf, hex[c>>4], hex[c&0xF])
|
||||
i = j + 1
|
||||
j = j + 1
|
||||
continue
|
||||
}
|
||||
|
||||
// This encodes bytes < 0x20 except for \t, \n and \r.
|
||||
if c < 0x20 {
|
||||
buf = append(buf, s[i:j]...)
|
||||
buf = append(buf, `\u00`...)
|
||||
buf = append(buf, hex[c>>4], hex[c&0xF])
|
||||
i = j + 1
|
||||
j = j + 1
|
||||
continue
|
||||
}
|
||||
|
||||
r, size := utf8.DecodeRuneInString(s[j:])
|
||||
|
||||
if r == utf8.RuneError && size == 1 {
|
||||
buf = append(buf, s[i:j]...)
|
||||
buf = append(buf, `\ufffd`...)
|
||||
i = j + size
|
||||
j = j + size
|
||||
continue
|
||||
}
|
||||
|
||||
switch r {
|
||||
case '\u2028', '\u2029':
|
||||
// U+2028 is LINE SEPARATOR.
|
||||
// U+2029 is PARAGRAPH SEPARATOR.
|
||||
// They are both technically valid characters in JSON strings,
|
||||
// but don't work in JSONP, which has to be evaluated as JavaScript,
|
||||
// and can lead to security holes there. It is valid JSON to
|
||||
// escape them, so we do so unconditionally.
|
||||
// See http://timelessrepo.com/json-isnt-a-javascript-subset for discussion.
|
||||
buf = append(buf, s[i:j]...)
|
||||
buf = append(buf, `\u202`...)
|
||||
buf = append(buf, hex[r&0xF])
|
||||
i = j + size
|
||||
j = j + size
|
||||
continue
|
||||
}
|
||||
|
||||
j += size
|
||||
}
|
||||
|
||||
return append(append(buf, s[i:]...), '"')
|
||||
}
|
||||
|
||||
func AppendString(buf []byte, s string) []byte {
|
||||
valLen := len(s)
|
||||
if valLen == 0 {
|
||||
return append(buf, `""`...)
|
||||
}
|
||||
buf = append(buf, '"')
|
||||
var escapeIdx int
|
||||
if valLen >= 8 {
|
||||
if escapeIdx = escapeIndex(s); escapeIdx < 0 {
|
||||
return append(append(buf, s...), '"')
|
||||
}
|
||||
}
|
||||
|
||||
i := 0
|
||||
j := escapeIdx
|
||||
for j < valLen {
|
||||
c := s[j]
|
||||
|
||||
if c >= 0x20 && c <= 0x7f && c != '\\' && c != '"' {
|
||||
// fast path: most of the time, printable ascii characters are used
|
||||
j++
|
||||
continue
|
||||
}
|
||||
|
||||
switch c {
|
||||
case '\\', '"':
|
||||
buf = append(buf, s[i:j]...)
|
||||
buf = append(buf, '\\', c)
|
||||
i = j + 1
|
||||
j = j + 1
|
||||
continue
|
||||
|
||||
case '\n':
|
||||
buf = append(buf, s[i:j]...)
|
||||
buf = append(buf, '\\', 'n')
|
||||
i = j + 1
|
||||
j = j + 1
|
||||
continue
|
||||
|
||||
case '\r':
|
||||
buf = append(buf, s[i:j]...)
|
||||
buf = append(buf, '\\', 'r')
|
||||
i = j + 1
|
||||
j = j + 1
|
||||
continue
|
||||
|
||||
case '\t':
|
||||
buf = append(buf, s[i:j]...)
|
||||
buf = append(buf, '\\', 't')
|
||||
i = j + 1
|
||||
j = j + 1
|
||||
continue
|
||||
|
||||
case '<', '>', '&':
|
||||
buf = append(buf, s[i:j]...)
|
||||
buf = append(buf, `\u00`...)
|
||||
buf = append(buf, hex[c>>4], hex[c&0xF])
|
||||
i = j + 1
|
||||
j = j + 1
|
||||
continue
|
||||
}
|
||||
|
||||
// This encodes bytes < 0x20 except for \t, \n and \r.
|
||||
if c < 0x20 {
|
||||
buf = append(buf, s[i:j]...)
|
||||
buf = append(buf, `\u00`...)
|
||||
buf = append(buf, hex[c>>4], hex[c&0xF])
|
||||
i = j + 1
|
||||
j = j + 1
|
||||
continue
|
||||
}
|
||||
|
||||
r, size := utf8.DecodeRuneInString(s[j:])
|
||||
|
||||
if r == utf8.RuneError && size == 1 {
|
||||
buf = append(buf, s[i:j]...)
|
||||
buf = append(buf, `\ufffd`...)
|
||||
i = j + size
|
||||
j = j + size
|
||||
continue
|
||||
}
|
||||
|
||||
switch r {
|
||||
case '\u2028', '\u2029':
|
||||
// U+2028 is LINE SEPARATOR.
|
||||
// U+2029 is PARAGRAPH SEPARATOR.
|
||||
// They are both technically valid characters in JSON strings,
|
||||
// but don't work in JSONP, which has to be evaluated as JavaScript,
|
||||
// and can lead to security holes there. It is valid JSON to
|
||||
// escape them, so we do so unconditionally.
|
||||
// See http://timelessrepo.com/json-isnt-a-javascript-subset for discussion.
|
||||
buf = append(buf, s[i:j]...)
|
||||
buf = append(buf, `\u202`...)
|
||||
buf = append(buf, hex[r&0xF])
|
||||
i = j + size
|
||||
j = j + size
|
||||
continue
|
||||
}
|
||||
|
||||
j += size
|
||||
}
|
||||
|
||||
return append(append(buf, s[i:]...), '"')
|
||||
}
|
||||
File diff suppressed because it is too large
Load Diff
|
|
@ -0,0 +1,9 @@
|
|||
package runtime
|
||||
|
||||
import "unsafe"
|
||||
|
||||
type SliceHeader struct {
|
||||
Data unsafe.Pointer
|
||||
Len int
|
||||
Cap int
|
||||
}
|
||||
Loading…
Reference in New Issue