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fix empty-matching lexers

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This commit is contained in:
Matthew Flatt 2010-07-06 07:15:19 -06:00
parent 763a010fd3
commit a6723283b8
1 changed files with 2 additions and 2 deletions
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4
collects/parser-tools/yacc-to-scheme.rkt
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@ -8,14 +8,14 @@
(define match-double-string
(lexer
((:* (:~ #\" #\\)) (append (string->list lexeme)
((:+ (:~ #\" #\\)) (append (string->list lexeme)
(match-double-string input-port)))
((:: #\\ any-char) (cons (string-ref lexeme 1) (match-double-string input-port)))
(#\" null)))
(define match-single-string
(lexer
((:* (:~ #\' #\\)) (append (string->list lexeme)
((:+ (:~ #\' #\\)) (append (string->list lexeme)
(match-single-string input-port)))
((:: #\\ any-char) (cons (string-ref lexeme 1) (match-single-string input-port)))
(#\' null)))