forked from mirrors/gotosocial
234 lines
7.1 KiB
Go
234 lines
7.1 KiB
Go
// +build !amd64 go1.21
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/*
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* Copyright 2023 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 encoder
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import (
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`io`
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`bytes`
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`encoding/json`
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`reflect`
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`github.com/bytedance/sonic/option`
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)
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// Options is a set of encoding options.
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type Options uint64
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const (
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bitSortMapKeys = iota
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bitEscapeHTML
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bitCompactMarshaler
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bitNoQuoteTextMarshaler
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bitNoNullSliceOrMap
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bitValidateString
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// used for recursive compile
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bitPointerValue = 63
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)
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const (
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// SortMapKeys indicates that the keys of a map needs to be sorted
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// before serializing into JSON.
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// WARNING: This hurts performance A LOT, USE WITH CARE.
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SortMapKeys Options = 1 << bitSortMapKeys
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// EscapeHTML indicates encoder to escape all HTML characters
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// after serializing into JSON (see https://pkg.go.dev/encoding/json#HTMLEscape).
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// WARNING: This hurts performance A LOT, USE WITH CARE.
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EscapeHTML Options = 1 << bitEscapeHTML
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// CompactMarshaler indicates that the output JSON from json.Marshaler
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// is always compact and needs no validation
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CompactMarshaler Options = 1 << bitCompactMarshaler
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// NoQuoteTextMarshaler indicates that the output text from encoding.TextMarshaler
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// is always escaped string and needs no quoting
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NoQuoteTextMarshaler Options = 1 << bitNoQuoteTextMarshaler
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// NoNullSliceOrMap indicates all empty Array or Object are encoded as '[]' or '{}',
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// instead of 'null'
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NoNullSliceOrMap Options = 1 << bitNoNullSliceOrMap
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// ValidateString indicates that encoder should validate the input string
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// before encoding it into JSON.
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ValidateString Options = 1 << bitValidateString
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// CompatibleWithStd is used to be compatible with std encoder.
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CompatibleWithStd Options = SortMapKeys | EscapeHTML | CompactMarshaler
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)
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// Encoder represents a specific set of encoder configurations.
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type Encoder struct {
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Opts Options
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prefix string
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indent string
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}
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// Encode returns the JSON encoding of v.
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func (self *Encoder) Encode(v interface{}) ([]byte, error) {
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if self.indent != "" || self.prefix != "" {
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return EncodeIndented(v, self.prefix, self.indent, self.Opts)
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}
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return Encode(v, self.Opts)
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}
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// SortKeys enables the SortMapKeys option.
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func (self *Encoder) SortKeys() *Encoder {
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self.Opts |= SortMapKeys
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return self
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}
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// SetEscapeHTML specifies if option EscapeHTML opens
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func (self *Encoder) SetEscapeHTML(f bool) {
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if f {
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self.Opts |= EscapeHTML
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} else {
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self.Opts &= ^EscapeHTML
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}
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}
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// SetValidateString specifies if option ValidateString opens
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func (self *Encoder) SetValidateString(f bool) {
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if f {
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self.Opts |= ValidateString
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} else {
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self.Opts &= ^ValidateString
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}
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}
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// SetCompactMarshaler specifies if option CompactMarshaler opens
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func (self *Encoder) SetCompactMarshaler(f bool) {
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if f {
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self.Opts |= CompactMarshaler
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} else {
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self.Opts &= ^CompactMarshaler
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}
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}
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// SetNoQuoteTextMarshaler specifies if option NoQuoteTextMarshaler opens
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func (self *Encoder) SetNoQuoteTextMarshaler(f bool) {
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if f {
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self.Opts |= NoQuoteTextMarshaler
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} else {
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self.Opts &= ^NoQuoteTextMarshaler
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}
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}
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// SetIndent instructs the encoder to format each subsequent encoded
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// value as if indented by the package-level function EncodeIndent().
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// Calling SetIndent("", "") disables indentation.
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func (enc *Encoder) SetIndent(prefix, indent string) {
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enc.prefix = prefix
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enc.indent = indent
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}
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// Quote returns the JSON-quoted version of s.
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func Quote(s string) string {
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/* check for empty string */
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if s == "" {
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return `""`
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}
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out, _ := json.Marshal(s)
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return string(out)
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}
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// Encode returns the JSON encoding of val, encoded with opts.
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func Encode(val interface{}, opts Options) ([]byte, error) {
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return json.Marshal(val)
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}
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// EncodeInto is like Encode but uses a user-supplied buffer instead of allocating
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// a new one.
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func EncodeInto(buf *[]byte, val interface{}, opts Options) error {
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if buf == nil {
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panic("user-supplied buffer buf is nil")
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}
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w := bytes.NewBuffer(*buf)
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enc := json.NewEncoder(w)
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enc.SetEscapeHTML((opts & EscapeHTML) != 0)
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err := enc.Encode(val)
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*buf = w.Bytes()
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return err
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}
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// HTMLEscape appends to dst the JSON-encoded src with <, >, &, U+2028 and U+2029
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// characters inside string literals changed to \u003c, \u003e, \u0026, \u2028, \u2029
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// so that the JSON will be safe to embed inside HTML <script> tags.
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// For historical reasons, web browsers don't honor standard HTML
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// escaping within <script> tags, so an alternative JSON encoding must
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// be used.
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func HTMLEscape(dst []byte, src []byte) []byte {
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d := bytes.NewBuffer(dst)
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json.HTMLEscape(d, src)
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return d.Bytes()
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}
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// EncodeIndented is like Encode but applies Indent to format the output.
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// Each JSON element in the output will begin on a new line beginning with prefix
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// followed by one or more copies of indent according to the indentation nesting.
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func EncodeIndented(val interface{}, prefix string, indent string, opts Options) ([]byte, error) {
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w := bytes.NewBuffer([]byte{})
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enc := json.NewEncoder(w)
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enc.SetEscapeHTML((opts & EscapeHTML) != 0)
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enc.SetIndent(prefix, indent)
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err := enc.Encode(val)
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out := w.Bytes()
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return out, err
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}
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// Pretouch compiles vt ahead-of-time to avoid JIT compilation on-the-fly, in
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// order to reduce the first-hit latency.
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//
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// Opts are the compile options, for example, "option.WithCompileRecursiveDepth" is
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// a compile option to set the depth of recursive compile for the nested struct type.
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func Pretouch(vt reflect.Type, opts ...option.CompileOption) error {
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return nil
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}
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// Valid validates json and returns first non-blank character position,
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// if it is only one valid json value.
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// Otherwise returns invalid character position using start.
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//
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// Note: it does not check for the invalid UTF-8 characters.
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func Valid(data []byte) (ok bool, start int) {
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return json.Valid(data), 0
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}
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// StreamEncoder uses io.Writer as
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type StreamEncoder struct {
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w io.Writer
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Encoder
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}
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// NewStreamEncoder adapts to encoding/json.NewDecoder API.
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//
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// NewStreamEncoder returns a new encoder that write to w.
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func NewStreamEncoder(w io.Writer) *StreamEncoder {
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return &StreamEncoder{w: w}
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}
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// Encode encodes interface{} as JSON to io.Writer
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func (enc *StreamEncoder) Encode(val interface{}) (err error) {
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jenc := json.NewEncoder(enc.w)
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jenc.SetEscapeHTML((enc.Opts & EscapeHTML) != 0)
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jenc.SetIndent(enc.prefix, enc.indent)
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err = jenc.Encode(val)
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return err
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}
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