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scanner: implement Peek() to look at the next char w/o advancing

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R=rsc
CC=golang-dev
https://golang.org/cl/840045
This commit is contained in:
Robert Griesemer 2010-04-14 21:33:34 -07:00
parent 1baf35e41f
commit 0fd00c8bb7
1 changed files with 8 additions and 0 deletions
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8
src/pkg/scanner/scanner.go
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@ -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) { func (s *Scanner) error(msg string) {
s.ErrorCount++ s.ErrorCount++
if s.Error != nil { if s.Error != nil {