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* import modifiers look good now.

This commit is contained in:
Abdulaziz Ghuloum 2007-05-04 10:31:15 -04:00
parent f9d0e76422
commit 6d38530828
2 changed files with 81 additions and 49 deletions
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src/libsyntax.ss
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@ -1951,75 +1951,107 @@
[(null? ls1) ls2]
[(memq (car ls1) ls2) (set-union (cdr ls1) ls2)]
[else (cons (car ls1) (set-union (cdr ls1) ls2))]))
(define (get-import-subst/libs-old imp*)
(define (merge-substs s subst)
(cond
[(null? s) subst]
[else
(let ([a (car s)])
(let ([name (car a)] [label (cdr a)])
(cond
[(assq name subst) =>
(lambda (x)
(cond
[(eq? (cdr x) label)
(merge-substs (cdr s) subst)]
[else
(error 'import
"two imports of ~s with different bindings"
name)]))]
[else
(cons a (merge-substs (cdr s) subst))])))]))
(cond
[(null? imp*) (values '() '())]
[else
(let-values ([(subst lib*)
(get-import-subst/libs (cdr imp*))])
(let ([lib (find-library-by-name (car imp*))])
(unless lib
(error 'import "cannot find imported library ~s" (car imp*)))
(let-values ([(s _r) (library-subst/env lib)])
(values (merge-substs s subst)
(set-cons lib lib*)))))]))
(define (get-import-subst/libs imp*)
(define (merge-substs s subst)
(cond
[(null? s) subst]
[else
(let ([a (car s)])
(define (insert-to-subst a subst)
(let ([name (car a)] [label (cdr a)])
(cond
[(assq name subst) =>
(lambda (x)
(cond
[(eq? (cdr x) label)
(merge-substs (cdr s) subst)]
[(eq? (cdr x) label) subst]
[else
(error 'import
"two imports of ~s with different bindings"
name)]))]
[else
(cons a (merge-substs (cdr s) subst))])))]))
(cons a subst)])))
(define (merge-substs s subst)
(cond
[(null? s) subst]
[else
(insert-to-subst (car s)
(merge-substs (cdr s) subst))]))
(define (exclude* sym* subst)
(define (exclude sym subst)
(cond
[(null? subst)
(error 'import "cannot rename unbound identifier ~s" sym)]
[(eq? sym (caar subst))
(values (cdar subst) (cdr subst))]
[else
(let ([a (car subst)])
(let-values ([(old subst) (exclude sym (cdr subst))])
(values old (cons a subst))))]))
(cond
[(null? sym*) (values '() subst)]
[else
(let-values ([(old subst) (exclude (car sym*) subst)])
(let-values ([(old* subst) (exclude* (cdr sym*) subst)])
(values (cons old old*) subst)))]))
(define (find* sym* subst)
(map (lambda (x)
(cond
[(assq x subst) => cdr]
[else (error 'import "cannot find identifier ~s" x)]))
sym*))
(define (rem* sym* subst)
(let f ([subst subst])
(cond
[(null? subst) '()]
[(memq (caar subst) sym*) (f (cdr subst))]
[else (cons (car subst) (f (cdr subst)))])))
(define (get-import spec)
(define (remove-dups ls)
(cond
[(null? ls) '()]
[(memq (car ls) (cdr ls)) (remove-dups (cdr ls))]
[else (cons (car ls) (remove-dups (cdr ls)))]))
(unless (pair? spec)
(error 'import "invalid import spec ~s" spec))
(case (car spec)
[(rename) (error #f "rename found")]
[(except) (error #f "except found")]
[(only) (error #f "only found")]
[(rename)
(syntax-match spec ()
[(_ isp (old* new*) ...)
(unless (and (andmap symbol? old*) (andmap symbol? new*))
(error 'import "invalid import spec ~s" spec))
(let-values ([(subst lib) (get-import isp)])
(let ([old-label* (find* old* subst)])
(let ([subst (rem* old* subst)])
;;; FIXME: make sure map is valid
(values (merge-substs (map cons new* old-label*) subst)
lib))))]
[_ (error 'import "invalid rename spec ~s" spec)])]
[(except)
(syntax-match spec ()
[(_ isp sym* ...)
(unless (andmap symbol? sym*)
(error 'import "invalid import spec ~s" spec))
(let-values ([(subst lib) (get-import isp)])
(values (rem* sym* subst) lib))]
[_ (error 'import "invalid import spec ~s" spec)])]
[(only)
(syntax-match spec ()
[(_ isp sym* ...)
(unless (andmap symbol? sym*)
(error 'import "invalid import spec ~s" spec))
(let-values ([(subst lib) (get-import isp)])
(let ([sym* (remove-dups sym*)])
(let ([lab* (find* sym* subst)])
(values (map cons sym* lab*) lib))))]
[_ (error 'import "invalid import spec ~s" spec)])]
[(prefix) (error #f "prefix found")]
[else
(let ([lib (find-library-by-name spec)])
(let-values ([(s _r) (library-subst/env lib)])
(values s (list lib))))]))
(values s lib)))]))
(cond
[(null? imp*) (values '() '())]
[else
(let-values ([(subst1 lib1*)
(get-import-subst/libs (cdr imp*))])
(let-values ([(subst2 lib2*) (get-import (car imp*))])
(let-values ([(subst2 lib2) (get-import (car imp*))])
(values (merge-substs subst1 subst2)
(set-union lib1* lib2*))))]))
(set-cons lib2 lib1*))))]))
(define (make-top-rib subst)
(let ([rib (make-empty-rib)])
(for-each