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Fixing bounds and multi-chunk stream errors.

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This commit is contained in:
Alex Shinn 2013-03-04 23:19:37 +09:00
parent 8cd7b9a265
commit 7dc3a63c21
1 changed files with 21 additions and 9 deletions
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30
lib/chibi/parse/parse.scm
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@ -86,7 +86,7 @@
(define (parse-stream-last-char source)
(let ((buf (parse-stream-buffer source)))
(let lp ((i (parse-stream-offset source)))
(let lp ((i (min (- (vector-length buf) 1) (parse-stream-offset source))))
(if (negative? i)
(parse-stream-prev-char source)
(let ((ch (vector-ref buf i)))
@ -101,7 +101,7 @@
(define (parse-stream-max-char source)
(let ((buf (parse-stream-buffer source)))
(let lp ((i (parse-stream-offset source)))
(let lp ((i (min (- (vector-length buf) 1) (parse-stream-offset source))))
(if (or (negative? i)
(char? (vector-ref buf i)))
i
@ -120,28 +120,39 @@
(define (parse-stream-close source)
(close-input-port (parse-stream-port source)))
(define (vector-substring vec start end)
(let ((res (make-string (- end start))))
(define (vector-substring vec start . o)
(let* ((end (if (pair? o) (car o) (vector-length vec)))
(res (make-string (- end start))))
(do ((i start (+ i 1)))
((= i end) res)
(string-set! res (- i start) (vector-ref vec i)))))
(define (parse-stream-in-tail? s0 s1)
(let ((s0^ (%parse-stream-tail s0)))
(or (eq? s0^ s1)
(and s0^ (parse-stream-in-tail? s0^ s1)))))
(define (parse-stream< s0 i0 s1 i1)
(if (eq? s0 s1)
(< i0 i1)
(parse-stream-in-tail? s0 s1)))
(define (parse-stream-substring s0 i0 s1 i1)
(cond
((eq? s0 s1)
(parse-stream-fill! s0 i1)
(vector-substring (parse-stream-buffer s0) i0 i1))
(else
(let lp ((s (parse-stream-next-source s0))
(res (list (vector-substring (parse-stream-buffer s0) i0 i1))))
(let lp ((s (parse-stream-tail s0))
(res (list (vector-substring (parse-stream-buffer s0) i0))))
(let ((buf (parse-stream-buffer s)))
(cond
((eq? s s1)
(apply string-append
(reverse (cons (vector-substring buf 0 i1) res))))
(else
(lp (parse-stream-next-source s)
(cons (vector-substring buf 0 (vector-length buf)) res)))))))))
(lp (parse-stream-tail s)
(cons (vector-substring buf 0) res)))))))))
(define (parse-stream-cache-cell s i f)
(assv f (vector-ref (parse-stream-cache s) i)))
@ -152,7 +163,8 @@
((assv f cache)
=> (lambda (cell)
;; prefer longer matches
(if (and (pair? (cdr cell)) (< (cadr (cddr cell)) i))
(if (and (pair? (cdr cell))
(parse-stream< (car (cddr cell)) (cadr (cddr cell)) s i))
(set-cdr! cell x))))
(else
(vector-set! (parse-stream-cache s) i (cons (cons f x) cache))))))