First commit

vendor/github.com/tdewolff/minify/json/json.go

@@ -0,0 +1,63 @@
+// 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
+		}
+	}
+}