From fb6dab658038153850eab2d84e46d66379acaf5e Mon Sep 17 00:00:00 2001
From: Robert Griesemer <gri@golang.org>
Date: Wed, 14 Apr 2010 21:33:34 -0700
Subject: scanner: implement Peek() to look at the next char w/o advancing

R=rsc
CC=golang-dev
http://codereview.appspot.com/840045
---
 src/pkg/scanner/scanner.go | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'src')

diff --git a/src/pkg/scanner/scanner.go b/src/pkg/scanner/scanner.go
index 25544f667..f60a4eed2 100644
--- a/src/pkg/scanner/scanner.go
+++ b/src/pkg/scanner/scanner.go
@@ -282,6 +282,14 @@ func (s *Scanner) Next() int {
 }
 
 
+// Peek returns the next Unicode character in the source without advancing
+// the scanner. It returns EOF if the scanner's position is at the last
+// character of the source.
+func (s *Scanner) Peek() int {
+	return s.ch
+}
+
+
 func (s *Scanner) error(msg string) {
 	s.ErrorCount++
 	if s.Error != nil {
-- 
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