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fixed a bug reported by Zane and Ahmed via Matthias

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svn: r13483
This commit is contained in:
Robby Findler 2009-02-07 13:09:11 +00:00
parent 30763e3b84
commit 12560f3a23
2 changed files with 105 additions and 27 deletions
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70
collects/redex/private/reduction-semantics.ss
View File

@ -1532,8 +1532,7 @@
(syntax->list #'(name ...))))])
(syntax/loc stx
(do-extend-language lang
(list (make-nt 'first-names (list (make-rhs `r-rhs '()) ...)) ...
(make-nt 'new-name (list (make-rhs 'orig-name '()))) ...)
(list (make-nt '(uniform-names ...) (list (make-rhs `r-rhs '()) ...)) ...)
(list (list '(uniform-names ...) (to-lw rhs) ...) ...))))]
[(_ lang (name rhs ...) ...)
(begin
@ -1565,31 +1564,62 @@
(define extend-nt-ellipses '(....))
;; do-extend-language : compiled-lang (listof (listof nt)) ? -> compiled-lang
;; note: the nts that come here are an abuse of the `nt' struct; they have
;; lists of symbols in the nt-name field.
(define (do-extend-language old-lang new-nts new-pict-infos)
(unless (compiled-lang? old-lang)
(error 'extend-language "expected a language as first argument, got ~e" old-lang))
(let ([old-nts (compiled-lang-lang old-lang)]
[old-ht (make-hasheq)]
[new-ht (make-hasheq)])
(for-each (λ (nt)
(hash-set! old-ht (nt-name nt) nt)
(hash-set! new-ht (nt-name nt) nt))
old-nts)
(let ([extended-nts '()])
(for-each (λ (raw-nt)
(let ([primary-name (find-primary-nt (nt-name raw-nt) old-lang)])
(when (and primary-name (member primary-name extended-nts))
(error 'extend-language "the non-terminal ~s was extended twice" primary-name))
(let ([nt (make-nt (or primary-name (nt-name raw-nt))
(nt-rhs raw-nt))])
(let* ([names (nt-name raw-nt)]
[rhs (nt-rhs raw-nt)]
[primary-names (map (λ (name) (find-primary-nt name old-lang)) names)]
[main-primary (car primary-names)])
;; error checking
(when (and (ormap not primary-names)
(ormap symbol? primary-names))
(error 'extend-language "new language extends old non-terminal ~a and also adds new shortcut ~a"
(ormap (λ (x y) (and (symbol? x) y)) primary-names names)
(ormap (λ (x y) (and (not x) y)) primary-names names)))
;; error checking
(when (andmap symbol? primary-names)
(let ([main-orig (car names)])
(let loop ([primary-names (cdr primary-names)]
[names (cdr names)])
(cond
[(null? primary-names) void]
[else
(unless (eq? main-primary (car primary-names))
(error 'extend-language
(string-append
"new language does not have the same non-terminal aliases as the old,"
" non-terminal ~a was not in the same group as ~a in the old language")
(car names)
main-orig))
(loop (cdr primary-names) (cdr names))]))))
;; rebind original nt
(let ([nt (make-nt (or main-primary (car names)) rhs)])
(cond
[(ormap (λ (rhs) (member (rhs-pattern rhs) extend-nt-ellipses))
(nt-rhs nt))
(unless (hash-ref old-ht (nt-name nt) #f)
(error 'extend-language
"the language extends the ~s non-terminal, but that non-terminal is not in the old language"
(nt-name raw-nt)))
(nt-name nt)))
(hash-set! new-ht
(nt-name nt)
(make-nt
@ -1598,8 +1628,17 @@
(filter (λ (rhs) (not (member (rhs-pattern rhs) extend-nt-ellipses)))
(nt-rhs nt)))))]
[else
(hash-set! new-ht (nt-name nt) nt)]))))
new-nts))
(hash-set! new-ht (nt-name nt) nt)]))
;; add new shortcuts (if necessary)
(unless main-primary
(for-each (λ (shortcut-name)
(hash-set! new-ht
shortcut-name
(make-nt shortcut-name (list (make-rhs (car names) '())))))
(cdr names)))))
new-nts)
(compile-language (vector (compiled-lang-pict-builder old-lang)
new-pict-infos)
@ -1609,9 +1648,16 @@
;; find-primary-nt : symbol lang -> symbol or #f
;; returns the primary non-terminal for a given nt, or #f if `nt' isn't bound in the language.
(define (find-primary-nt nt lang)
(let ([combined (find-combined-nts nt lang)])
(and combined
(car combined))))
;; find-combined-nts : symbol lang -> (listof symbol) or #f
;; returns the combined set of non-terminals for 'nt' from lang
(define (find-combined-nts nt lang)
(ormap (λ (nt-line)
(and (member nt nt-line)
(car nt-line)))
nt-line))
(compiled-lang-nt-map lang)))
(define (apply-reduction-relation* reductions exp)

32
collects/redex/private/tl-test.ss
View File

@ -191,6 +191,37 @@
(test (pair? (redex-match iswim-cont W (term QQ)))
#t))
(let ()
(define-language okay
[(X Y) z])
(define-extended-language replace-both
okay
[(X Y) q])
;; this test ran into an infinite loop in an earlier version of redex.
(test (redex-match replace-both X (term explode)) #f))
(test (with-handlers ([exn? exn-message])
(let ()
(define-language main
[(X Y) z])
(define-extended-language new
main
[(X Y Z) q])
(void)))
"extend-language: new language extends old non-terminal X and also adds new shortcut Z")
(test (with-handlers ([exn? exn-message])
(let ()
(define-language main
[(X Y) z]
[(P Q) w])
(define-extended-language new
main
[(X P) q])
(void)))
"extend-language: new language does not have the same non-terminal aliases as the old, non-terminal P was not in the same group as X in the old language")
;; test caching
(let ()
@ -231,6 +262,7 @@
(test rhs-eval-count 2))
;
;
; ;;; ;