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-rw-r--r--module/ice-9/peg/string-peg.scm16
1 files changed, 12 insertions, 4 deletions
diff --git a/module/ice-9/peg/string-peg.scm b/module/ice-9/peg/string-peg.scm
index 0026f8930..745d8e8e7 100644
--- a/module/ice-9/peg/string-peg.scm
+++ b/module/ice-9/peg/string-peg.scm
@@ -301,11 +301,19 @@ EndOfFile < !.
(define (Literal->defn lst for-syntax)
(apply string (map (lambda (x) (Char->defn x for-syntax)) (cdr lst))))
-;; (NotInClass ...)
-;; `-> (and ...)
+;; (NotInClass (Range ...) (Range ...))
+;; `-> (and (followed-by (not-in-range ...))
+;; (followed-by (not-in-range ...))
+;; ...
+;; (not-in-range ...))
+;; NOTE: the order doesn't matter, because all `not-in-range`s will always
+;; parse exactly one character, but all the elements but the last need not to
+;; consume the input.
(define (NotInClass->defn lst for-syntax)
- #`(and #,@(map (lambda (x) (NotInRange->defn x for-syntax))
- (cdr lst))))
+ #`(and
+ #,@(map (lambda (x) #`(followed-by #,(NotInRange->defn x for-syntax)))
+ (cddr lst))
+ #,(NotInRange->defn (cadr lst) for-syntax)))
;; (Class ...)
;; `-> (or ...)