64 lines
1.5 KiB
Go
64 lines
1.5 KiB
Go
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// Package json minifies JSON following the specifications at http://json.org/.
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package json // import "github.com/tdewolff/minify/json"
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import (
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"io"
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"github.com/tdewolff/minify"
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"github.com/tdewolff/parse/json"
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)
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var (
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commaBytes = []byte(",")
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colonBytes = []byte(":")
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)
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////////////////////////////////////////////////////////////////
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// DefaultMinifier is the default minifier.
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var DefaultMinifier = &Minifier{}
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// Minifier is a JSON minifier.
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type Minifier struct{}
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// Minify minifies JSON data, it reads from r and writes to w.
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func Minify(m *minify.M, w io.Writer, r io.Reader, params map[string]string) error {
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return DefaultMinifier.Minify(m, w, r, params)
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}
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// Minify minifies JSON data, it reads from r and writes to w.
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func (o *Minifier) Minify(_ *minify.M, w io.Writer, r io.Reader, _ map[string]string) error {
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skipComma := true
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p := json.NewParser(r)
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defer p.Restore()
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for {
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state := p.State()
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gt, text := p.Next()
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if gt == json.ErrorGrammar {
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if p.Err() != io.EOF {
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return p.Err()
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}
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return nil
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}
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if !skipComma && gt != json.EndObjectGrammar && gt != json.EndArrayGrammar {
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if state == json.ObjectKeyState || state == json.ArrayState {
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if _, err := w.Write(commaBytes); err != nil {
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return err
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}
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} else if state == json.ObjectValueState {
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if _, err := w.Write(colonBytes); err != nil {
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return err
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}
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}
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}
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skipComma = gt == json.StartObjectGrammar || gt == json.StartArrayGrammar
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if _, err := w.Write(text); err != nil {
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return err
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}
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}
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}
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