mirror of
https://github.com/wader/fq.git
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331 lines
7.2 KiB
Go
331 lines
7.2 KiB
Go
// Package colorjson is gojq:s cli/encoder.go extract to be reusable and have non-global color config
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// TODO: possible gojq can export it?
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//
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// The MIT License (MIT)
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// Copyright (c) 2019-2022 itchyny
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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package colorjson
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import (
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"bytes"
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"fmt"
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"io"
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"math"
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"math/big"
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"sort"
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"strconv"
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"unicode/utf8"
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)
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type Colors struct {
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Reset []byte
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Null []byte
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False []byte
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True []byte
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Number []byte
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String []byte
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ObjectKey []byte
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Array []byte
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Object []byte
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}
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type Options struct {
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Color bool
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Tab bool
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Indent int
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ValueFn func(v any) any
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Colors Colors
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}
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type Encoder struct {
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out io.Writer
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w *bytes.Buffer
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depth int
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buf [64]byte
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opts Options
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}
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func NewEncoder(opts Options) *Encoder {
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// reuse the buffer in multiple calls of marshal
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return &Encoder{
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w: new(bytes.Buffer),
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opts: opts,
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}
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}
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func (e *Encoder) flush() error {
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_, err := e.out.Write(e.w.Bytes())
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e.w.Reset()
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return err
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}
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func (e *Encoder) Marshal(v any, w io.Writer) error {
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e.out = w
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err := e.encode(v)
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if ferr := e.flush(); ferr != nil && err == nil {
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err = ferr
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}
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return err
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}
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func (e *Encoder) encode(v any) error {
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switch v := v.(type) {
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case nil:
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e.write([]byte("null"), e.opts.Colors.Null)
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case bool:
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if v {
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e.write([]byte("true"), e.opts.Colors.True)
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} else {
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e.write([]byte("false"), e.opts.Colors.False)
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}
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case int:
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e.write(strconv.AppendInt(e.buf[:0], int64(v), 10), e.opts.Colors.Number)
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case float64:
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e.encodeFloat64(v)
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case *big.Int:
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e.write(v.Append(e.buf[:0], 10), e.opts.Colors.Number)
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case string:
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e.encodeString(v, e.opts.Colors.String)
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case []any:
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if err := e.encodeArray(v); err != nil {
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return err
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}
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case map[string]any:
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if err := e.encodeMap(v); err != nil {
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return err
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}
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case error:
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// value we're trying to encode is an error
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// this can happen if ValueFn is used and it reads from reader that gets cancelled etc
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return v
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default:
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if e.opts.ValueFn == nil {
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panic(fmt.Sprintf("unknown type and to ValueFn set: %[1]T (%[1]v)", v))
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}
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return e.encode(e.opts.ValueFn(v))
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}
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if e.w.Len() > 8*1024 {
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return e.flush()
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}
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return nil
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}
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// ref: floatEncoder in encoding/json
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func (e *Encoder) encodeFloat64(f float64) {
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if math.IsNaN(f) {
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e.write([]byte("null"), e.opts.Colors.Null)
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return
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}
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if f >= math.MaxFloat64 {
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f = math.MaxFloat64
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} else if f <= -math.MaxFloat64 {
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f = -math.MaxFloat64
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}
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format := byte('f')
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if x := math.Abs(f); x != 0 && x < 1e-6 || x >= 1e21 {
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format = 'e'
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}
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buf := strconv.AppendFloat(e.buf[:0], f, format, -1, 64)
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if format == 'e' {
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// clean up e-09 to e-9
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if n := len(buf); n >= 4 && buf[n-4] == 'e' && buf[n-3] == '-' && buf[n-2] == '0' {
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buf[n-2] = buf[n-1]
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buf = buf[:n-1]
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}
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}
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e.write(buf, e.opts.Colors.Number)
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}
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// ref: encodeState#string in encoding/json
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func (e *Encoder) encodeString(s string, color []byte) {
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if color != nil {
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e.setColor(e.w, color)
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}
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e.w.WriteByte('"')
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start := 0
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for i := 0; i < len(s); {
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if b := s[i]; b < utf8.RuneSelf {
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if ' ' <= b && b <= '~' && b != '"' && b != '\\' {
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i++
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continue
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}
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if start < i {
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e.w.WriteString(s[start:i])
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}
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switch b {
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case '"':
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e.w.WriteString(`\"`)
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case '\\':
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e.w.WriteString(`\\`)
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case '\b':
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e.w.WriteString(`\b`)
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case '\f':
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e.w.WriteString(`\f`)
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case '\n':
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e.w.WriteString(`\n`)
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case '\r':
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e.w.WriteString(`\r`)
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case '\t':
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e.w.WriteString(`\t`)
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default:
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const hex = "0123456789abcdef"
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e.w.WriteString(`\u00`)
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e.w.WriteByte(hex[b>>4])
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e.w.WriteByte(hex[b&0xF])
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}
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i++
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start = i
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continue
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}
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c, size := utf8.DecodeRuneInString(s[i:])
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if c == utf8.RuneError && size == 1 {
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if start < i {
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e.w.WriteString(s[start:i])
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}
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e.w.WriteString(`\ufffd`)
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i += size
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start = i
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continue
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}
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i += size
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}
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if start < len(s) {
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e.w.WriteString(s[start:])
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}
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e.w.WriteByte('"')
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if color != nil {
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e.setColor(e.w, e.opts.Colors.Reset)
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}
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}
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func (e *Encoder) encodeArray(vs []any) error {
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e.writeByte('[', e.opts.Colors.Array)
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e.depth += e.opts.Indent
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for i, v := range vs {
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if i > 0 {
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e.writeByte(',', e.opts.Colors.Array)
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}
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if e.opts.Indent != 0 {
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e.writeIndent()
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}
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if err := e.encode(v); err != nil {
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return err
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}
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}
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e.depth -= e.opts.Indent
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if len(vs) > 0 && e.opts.Indent != 0 {
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e.writeIndent()
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}
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e.writeByte(']', e.opts.Colors.Array)
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return nil
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}
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func (e *Encoder) encodeMap(vs map[string]any) error {
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e.writeByte('{', e.opts.Colors.Object)
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e.depth += e.opts.Indent
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type keyVal struct {
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key string
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val any
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}
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kvs := make([]keyVal, len(vs))
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var i int
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for k, v := range vs {
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kvs[i] = keyVal{k, v}
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i++
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}
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sort.Slice(kvs, func(i, j int) bool {
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return kvs[i].key < kvs[j].key
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})
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for i, kv := range kvs {
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if i > 0 {
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e.writeByte(',', e.opts.Colors.Object)
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}
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if e.opts.Indent != 0 {
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e.writeIndent()
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}
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e.encodeString(kv.key, e.opts.Colors.ObjectKey)
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e.writeByte(':', e.opts.Colors.Object)
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if e.opts.Indent != 0 {
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e.w.WriteByte(' ')
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}
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if err := e.encode(kv.val); err != nil {
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return err
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}
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}
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e.depth -= e.opts.Indent
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if len(vs) > 0 && e.opts.Indent != 0 {
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e.writeIndent()
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}
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e.writeByte('}', e.opts.Colors.Object)
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return nil
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}
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func (e *Encoder) writeIndent() {
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e.w.WriteByte('\n')
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if n := e.depth; n > 0 {
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if e.opts.Tab {
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e.writeIndentInternal(n, "\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t")
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} else {
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e.writeIndentInternal(n, " ")
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}
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}
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}
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func (e *Encoder) writeIndentInternal(n int, spaces string) {
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if l := len(spaces); n <= l {
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e.w.WriteString(spaces[:n])
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} else {
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e.w.WriteString(spaces)
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for n -= l; n > 0; n, l = n-l, l*2 {
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if n < l {
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l = n
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}
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e.w.Write(e.w.Bytes()[e.w.Len()-l:])
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}
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}
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}
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func (e *Encoder) writeByte(b byte, color []byte) {
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if color == nil {
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e.w.WriteByte(b)
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} else {
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e.setColor(e.w, color)
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e.w.WriteByte(b)
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e.setColor(e.w, e.opts.Colors.Reset)
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}
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}
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func (e *Encoder) write(bs []byte, color []byte) {
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if color == nil {
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e.w.Write(bs)
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} else {
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e.setColor(e.w, color)
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e.w.Write(bs)
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e.setColor(e.w, e.opts.Colors.Reset)
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}
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}
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func (e *Encoder) setColor(buf *bytes.Buffer, color []byte) {
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if e.opts.Color {
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buf.Write(color)
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}
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}
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