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