From d1142d3549731282ac9ed5f1dc7acdcff9290dca Mon Sep 17 00:00:00 2001
From: Vladimir Varankin <nek.narqo+git@gmail.com>
Date: Tue, 7 Mar 2017 12:49:04 +0300
Subject: [PATCH] avoid data convertion during encodig

---
 gen/decoder.go  | 4 ++--
 jlexer/lexer.go | 6 ++++++
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/gen/decoder.go b/gen/decoder.go
index 82558a7..80f8d2c 100644
--- a/gen/decoder.go
+++ b/gen/decoder.go
@@ -68,8 +68,8 @@ func (g *Generator) genTypeDecoder(t reflect.Type, out string, tags fieldTags, i
 
 	unmarshalerIface = reflect.TypeOf((*encoding.TextUnmarshaler)(nil)).Elem()
 	if reflect.PtrTo(t).Implements(unmarshalerIface) {
-		fmt.Fprintln(g.out, ws+"if data := in.UnsafeString(); in.Ok() {")
-		fmt.Fprintln(g.out, ws+"  in.AddError( ("+out+").UnmarshalText([]byte(data)) )")
+		fmt.Fprintln(g.out, ws+"if data := in.UnsafeBytes(); in.Ok() {")
+		fmt.Fprintln(g.out, ws+"  in.AddError( ("+out+").UnmarshalText(data) )")
 		fmt.Fprintln(g.out, ws+"}")
 		return nil
 	}
diff --git a/jlexer/lexer.go b/jlexer/lexer.go
index ae8344e..d4c16f1 100644
--- a/jlexer/lexer.go
+++ b/jlexer/lexer.go
@@ -618,6 +618,12 @@ func (r *Lexer) UnsafeString() string {
 	return ret
 }
 
+// UnsafeBytes returns the byte slice if the token is a string literal.
+func (r *Lexer) UnsafeBytes() []byte {
+	_, ret := r.unsafeString()
+	return ret
+}
+
 // String reads a string literal.
 func (r *Lexer) String() string {
 	if r.token.kind == tokenUndef && r.Ok() {