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lexer: add peek() method

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This commit is contained in:
Fatih Arslan 2015-10-03 20:33:51 +03:00
parent 70845ccfec
commit ca906622c2
1 changed files with 8 additions and 0 deletions
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8
parser/lexer.go
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@ -38,6 +38,14 @@ func (l *Lexer) next() rune {
// unread places the previously read rune back on the reader. // unread places the previously read rune back on the reader.
func (l *Lexer) unread() { _ = l.src.UnreadRune() } func (l *Lexer) unread() { _ = l.src.UnreadRune() }
func (l *Lexer) peek() rune {
prev := l.ch
peekCh := l.next()
l.unread()
l.ch = prev
return peekCh
}
// Scan scans the next token and returns the token and it's literal string. // Scan scans the next token and returns the token and it's literal string.
func (l *Lexer) Scan() (tok Token, lit string) { func (l *Lexer) Scan() (tok Token, lit string) {
ch := l.next() ch := l.next()