mirror of https://github.com/prometheus/prometheus
274 lines
6.4 KiB
Go
274 lines
6.4 KiB
Go
// Package jwriter contains a JSON writer.
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package jwriter
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import (
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"io"
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"strconv"
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"unicode/utf8"
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"github.com/mailru/easyjson/buffer"
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)
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// Writer is a JSON writer.
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type Writer struct {
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Error error
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Buffer buffer.Buffer
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}
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// Size returns the size of the data that was written out.
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func (w *Writer) Size() int {
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return w.Buffer.Size()
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}
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// DumpTo outputs the data to given io.Writer, resetting the buffer.
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func (w *Writer) DumpTo(out io.Writer) (written int, err error) {
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return w.Buffer.DumpTo(out)
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}
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// BuildBytes returns writer data as a single byte slice.
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func (w *Writer) BuildBytes() ([]byte, error) {
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if w.Error != nil {
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return nil, w.Error
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}
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return w.Buffer.BuildBytes(), nil
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}
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// RawByte appends raw binary data to the buffer.
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func (w *Writer) RawByte(c byte) {
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w.Buffer.AppendByte(c)
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}
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// RawByte appends raw binary data to the buffer.
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func (w *Writer) RawString(s string) {
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w.Buffer.AppendString(s)
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}
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// RawByte appends raw binary data to the buffer or sets the error if it is given. Useful for
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// calling with results of MarshalJSON-like functions.
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func (w *Writer) Raw(data []byte, err error) {
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switch {
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case w.Error != nil:
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return
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case err != nil:
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w.Error = err
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case len(data) > 0:
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w.Buffer.AppendBytes(data)
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default:
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w.RawString("null")
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}
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}
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func (w *Writer) Uint8(n uint8) {
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w.Buffer.EnsureSpace(3)
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w.Buffer.Buf = strconv.AppendUint(w.Buffer.Buf, uint64(n), 10)
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}
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func (w *Writer) Uint16(n uint16) {
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w.Buffer.EnsureSpace(5)
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w.Buffer.Buf = strconv.AppendUint(w.Buffer.Buf, uint64(n), 10)
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}
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func (w *Writer) Uint32(n uint32) {
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w.Buffer.EnsureSpace(10)
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w.Buffer.Buf = strconv.AppendUint(w.Buffer.Buf, uint64(n), 10)
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}
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func (w *Writer) Uint(n uint) {
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w.Buffer.EnsureSpace(20)
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w.Buffer.Buf = strconv.AppendUint(w.Buffer.Buf, uint64(n), 10)
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}
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func (w *Writer) Uint64(n uint64) {
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w.Buffer.EnsureSpace(20)
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w.Buffer.Buf = strconv.AppendUint(w.Buffer.Buf, n, 10)
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}
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func (w *Writer) Int8(n int8) {
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w.Buffer.EnsureSpace(4)
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w.Buffer.Buf = strconv.AppendInt(w.Buffer.Buf, int64(n), 10)
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}
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func (w *Writer) Int16(n int16) {
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w.Buffer.EnsureSpace(6)
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w.Buffer.Buf = strconv.AppendInt(w.Buffer.Buf, int64(n), 10)
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}
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func (w *Writer) Int32(n int32) {
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w.Buffer.EnsureSpace(11)
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w.Buffer.Buf = strconv.AppendInt(w.Buffer.Buf, int64(n), 10)
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}
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func (w *Writer) Int(n int) {
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w.Buffer.EnsureSpace(21)
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w.Buffer.Buf = strconv.AppendInt(w.Buffer.Buf, int64(n), 10)
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}
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func (w *Writer) Int64(n int64) {
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w.Buffer.EnsureSpace(21)
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w.Buffer.Buf = strconv.AppendInt(w.Buffer.Buf, n, 10)
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}
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func (w *Writer) Uint8Str(n uint8) {
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w.Buffer.EnsureSpace(3)
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w.Buffer.Buf = append(w.Buffer.Buf, '"')
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w.Buffer.Buf = strconv.AppendUint(w.Buffer.Buf, uint64(n), 10)
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w.Buffer.Buf = append(w.Buffer.Buf, '"')
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}
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func (w *Writer) Uint16Str(n uint16) {
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w.Buffer.EnsureSpace(5)
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w.Buffer.Buf = append(w.Buffer.Buf, '"')
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w.Buffer.Buf = strconv.AppendUint(w.Buffer.Buf, uint64(n), 10)
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w.Buffer.Buf = append(w.Buffer.Buf, '"')
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}
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func (w *Writer) Uint32Str(n uint32) {
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w.Buffer.EnsureSpace(10)
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w.Buffer.Buf = append(w.Buffer.Buf, '"')
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w.Buffer.Buf = strconv.AppendUint(w.Buffer.Buf, uint64(n), 10)
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w.Buffer.Buf = append(w.Buffer.Buf, '"')
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}
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func (w *Writer) UintStr(n uint) {
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w.Buffer.EnsureSpace(20)
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w.Buffer.Buf = append(w.Buffer.Buf, '"')
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w.Buffer.Buf = strconv.AppendUint(w.Buffer.Buf, uint64(n), 10)
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w.Buffer.Buf = append(w.Buffer.Buf, '"')
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}
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func (w *Writer) Uint64Str(n uint64) {
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w.Buffer.EnsureSpace(20)
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w.Buffer.Buf = append(w.Buffer.Buf, '"')
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w.Buffer.Buf = strconv.AppendUint(w.Buffer.Buf, n, 10)
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w.Buffer.Buf = append(w.Buffer.Buf, '"')
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}
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func (w *Writer) Int8Str(n int8) {
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w.Buffer.EnsureSpace(4)
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w.Buffer.Buf = append(w.Buffer.Buf, '"')
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w.Buffer.Buf = strconv.AppendInt(w.Buffer.Buf, int64(n), 10)
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w.Buffer.Buf = append(w.Buffer.Buf, '"')
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}
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func (w *Writer) Int16Str(n int16) {
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w.Buffer.EnsureSpace(6)
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w.Buffer.Buf = append(w.Buffer.Buf, '"')
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w.Buffer.Buf = strconv.AppendInt(w.Buffer.Buf, int64(n), 10)
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w.Buffer.Buf = append(w.Buffer.Buf, '"')
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}
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func (w *Writer) Int32Str(n int32) {
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w.Buffer.EnsureSpace(11)
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w.Buffer.Buf = append(w.Buffer.Buf, '"')
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w.Buffer.Buf = strconv.AppendInt(w.Buffer.Buf, int64(n), 10)
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w.Buffer.Buf = append(w.Buffer.Buf, '"')
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}
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func (w *Writer) IntStr(n int) {
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w.Buffer.EnsureSpace(21)
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w.Buffer.Buf = append(w.Buffer.Buf, '"')
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w.Buffer.Buf = strconv.AppendInt(w.Buffer.Buf, int64(n), 10)
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w.Buffer.Buf = append(w.Buffer.Buf, '"')
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}
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func (w *Writer) Int64Str(n int64) {
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w.Buffer.EnsureSpace(21)
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w.Buffer.Buf = append(w.Buffer.Buf, '"')
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w.Buffer.Buf = strconv.AppendInt(w.Buffer.Buf, n, 10)
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w.Buffer.Buf = append(w.Buffer.Buf, '"')
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}
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func (w *Writer) Float32(n float32) {
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w.Buffer.EnsureSpace(20)
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w.Buffer.Buf = strconv.AppendFloat(w.Buffer.Buf, float64(n), 'g', -1, 32)
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}
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func (w *Writer) Float64(n float64) {
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w.Buffer.EnsureSpace(20)
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w.Buffer.Buf = strconv.AppendFloat(w.Buffer.Buf, n, 'g', -1, 64)
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}
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func (w *Writer) Bool(v bool) {
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w.Buffer.EnsureSpace(5)
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if v {
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w.Buffer.Buf = append(w.Buffer.Buf, "true"...)
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} else {
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w.Buffer.Buf = append(w.Buffer.Buf, "false"...)
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}
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}
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const chars = "0123456789abcdef"
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func (w *Writer) String(s string) {
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w.Buffer.AppendByte('"')
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// Portions of the string that contain no escapes are appended as
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// byte slices.
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p := 0 // last non-escape symbol
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for i := 0; i < len(s); {
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// single-with character
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if c := s[i]; c < utf8.RuneSelf {
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var escape byte
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switch c {
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case '\t':
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escape = 't'
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case '\r':
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escape = 'r'
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case '\n':
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escape = 'n'
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case '\\':
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escape = '\\'
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case '"':
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escape = '"'
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case '<', '>':
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// do nothing
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default:
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if c >= 0x20 {
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// no escaping is required
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i++
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continue
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}
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}
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if escape != 0 {
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w.Buffer.AppendString(s[p:i])
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w.Buffer.AppendByte('\\')
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w.Buffer.AppendByte(escape)
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} else {
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w.Buffer.AppendString(s[p:i])
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w.Buffer.AppendString(`\u00`)
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w.Buffer.AppendByte(chars[c>>4])
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w.Buffer.AppendByte(chars[c&0xf])
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}
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i++
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p = i
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continue
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}
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// broken utf
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runeValue, runeWidth := utf8.DecodeRuneInString(s[i:])
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if runeValue == utf8.RuneError && runeWidth == 1 {
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w.Buffer.AppendString(s[p:i])
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w.Buffer.AppendString(`\ufffd`)
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i++
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p = i
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continue
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}
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// jsonp stuff - tab separator and line separator
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if runeValue == '\u2028' || runeValue == '\u2029' {
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w.Buffer.AppendString(s[p:i])
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w.Buffer.AppendString(`\u202`)
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w.Buffer.AppendByte(chars[runeValue&0xf])
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i += runeWidth
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p = i
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continue
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}
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i += runeWidth
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}
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w.Buffer.AppendString(s[p:])
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w.Buffer.AppendByte('"')
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}
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