75 lines
1.8 KiB
Go
75 lines
1.8 KiB
Go
// Package json minifies JSON following the specifications at http://json.org/.
|
|
package json
|
|
|
|
import (
|
|
"io"
|
|
|
|
"github.com/tdewolff/minify/v2"
|
|
"github.com/tdewolff/parse/v2"
|
|
"github.com/tdewolff/parse/v2/json"
|
|
)
|
|
|
|
var (
|
|
commaBytes = []byte(",")
|
|
colonBytes = []byte(":")
|
|
zeroBytes = []byte("0")
|
|
minusZeroBytes = []byte("-0")
|
|
)
|
|
|
|
////////////////////////////////////////////////////////////////
|
|
|
|
// DefaultMinifier is the default minifier.
|
|
var DefaultMinifier = &Minifier{}
|
|
|
|
// Minifier is a JSON minifier.
|
|
type Minifier struct {
|
|
Precision int // number of significant digits
|
|
}
|
|
|
|
// 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
|
|
|
|
z := parse.NewInput(r)
|
|
defer z.Restore()
|
|
|
|
p := json.NewParser(z)
|
|
for {
|
|
state := p.State()
|
|
gt, text := p.Next()
|
|
if gt == json.ErrorGrammar {
|
|
if _, err := w.Write(nil); err != nil {
|
|
return err
|
|
}
|
|
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 {
|
|
w.Write(commaBytes)
|
|
} else if state == json.ObjectValueState {
|
|
w.Write(colonBytes)
|
|
}
|
|
}
|
|
skipComma = gt == json.StartObjectGrammar || gt == json.StartArrayGrammar
|
|
|
|
if 0 < len(text) && ('0' <= text[0] && text[0] <= '9' || text[0] == '-') {
|
|
text = minify.Number(text, o.Precision)
|
|
if text[0] == '.' {
|
|
w.Write(zeroBytes)
|
|
} else if 1 < len(text) && text[0] == '-' && text[1] == '.' {
|
|
text = text[1:]
|
|
w.Write(minusZeroBytes)
|
|
}
|
|
}
|
|
w.Write(text)
|
|
}
|
|
}
|