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Fix R6RS imports of interfaces that use interfaces

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* module/ice-9/r6rs-libraries.scm (resolve-r6rs-interface): In Guile, a
  module's public interface is just another module, and that means that
  it can import other modules as well.  Allow for R6RS modules that
  import module whose interfaces import other modules to access all
  visible bindings.
* test-suite/tests/rnrs-libraries.test ("import features"): Update
  test.
This commit is contained in:
Andy Wingo 2016-04-14 11:50:08 +02:00
parent cf80502c0a
commit 5e470ea48f
2 changed files with 57 additions and 19 deletions
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34
module/ice-9/r6rs-libraries.scm
View file

@ -26,6 +26,17 @@
(set-module-kind! iface 'custom-interface)
(set-module-name! iface (module-name mod))
iface))
(define (module-for-each/nonlocal f mod)
(define (module-and-uses mod)
(let lp ((in (list mod)) (out '()))
(cond
((null? in) (reverse out))
((memq (car in) out) (lp (cdr in) out))
(else (lp (append (module-uses (car in)) (cdr in))
(cons (car in) out))))))
(for-each (lambda (mod)
(module-for-each f mod))
(module-and-uses mod)))
(define (sym? x) (symbol? (syntax->datum x)))
(syntax-case import-spec (library only except prefix rename srfi)
@ -63,7 +74,7 @@
(iface (make-custom-interface mod)))
(for-each (lambda (sym)
(module-add! iface sym
(or (module-local-variable mod sym)
(or (module-variable mod sym)
(error "no binding `~A' in module ~A"
sym mod))))
(syntax->datum #'(identifier ...)))
@ -73,7 +84,9 @@
(and-map sym? #'(identifier ...))
(let* ((mod (resolve-r6rs-interface #'import-set))
(iface (make-custom-interface mod)))
(module-for-each (lambda (sym var) (module-add! iface sym var)) mod)
(module-for-each/nonlocal (lambda (sym var)
(module-add! iface sym var))
mod)
(for-each (lambda (sym)
(if (module-local-variable iface sym)
(module-remove! iface sym)
@ -86,16 +99,19 @@
(let* ((mod (resolve-r6rs-interface #'import-set))
(iface (make-custom-interface mod))
(pre (syntax->datum #'identifier)))
(module-for-each (lambda (sym var)
(module-add! iface (symbol-append pre sym) var))
mod)
(module-for-each/nonlocal
(lambda (sym var)
(module-add! iface (symbol-append pre sym) var))
mod)
iface))
((rename import-set (from to) ...)
(and (and-map sym? #'(from ...)) (and-map sym? #'(to ...)))
(let* ((mod (resolve-r6rs-interface #'import-set))
(iface (make-custom-interface mod)))
(module-for-each (lambda (sym var) (module-add! iface sym var)) mod)
(module-for-each/nonlocal
(lambda (sym var) (module-add! iface sym var))
mod)
(let lp ((in (syntax->datum #'((from . to) ...))) (out '()))
(cond
((null? in)
@ -108,7 +124,7 @@
out)
iface)
(else
(let ((var (or (module-local-variable mod (caar in))
(let ((var (or (module-variable mod (caar in))
(error "no binding `~A' in module ~A"
(caar in) mod))))
(module-remove! iface (caar in))
@ -126,9 +142,9 @@
(lambda (stx)
(define (compute-exports ifaces specs)
(define (re-export? sym)
(or-map (lambda (iface) (module-local-variable iface sym)) ifaces))
(or-map (lambda (iface) (module-variable iface sym)) ifaces))
(define (replace? sym)
(module-local-variable the-scm-module sym))
(module-variable the-scm-module sym))
(let lp ((specs specs) (e '()) (r '()) (x '()))
(syntax-case specs (rename)

42
test-suite/tests/rnrs-libraries.test
View file

@ -143,18 +143,40 @@
(module-obarray (resolve-r6rs-interface '(only (guile) +)))))))
(with-test-prefix "except"
(let ((bindings (hash-map->list
(lambda (sym var) sym)
(module-obarray
(resolve-r6rs-interface '(except (guile) +))))))
;; In Guile, interfaces can use other interfaces. For R6RS modules
;; that are imported as-is (without `except', etc), Guile will just
;; import them as-is. `(guile)' is one of those modules. For other
;; import kinds like `except', the resolve-r6rs-interface code will
;; go binding-by-binding and create a new flat interface. Anyway,
;; that means to compare an except interface with (guile), we're
;; comparing a flat interface with a deep interface, so we need to
;; do more work to get the set of bindings in (guile), knowing also
;; that some of those bindings could be duplicates.
(define (bound-name-count mod)
(define (module-for-each/nonlocal f mod)
(define (module-and-uses mod)
(let lp ((in (list mod)) (out '()))
(cond
((null? in) (reverse out))
((memq (car in) out) (lp (cdr in) out))
(else (lp (append (module-uses (car in)) (cdr in))
(cons (car in) out))))))
(for-each (lambda (mod)
(module-for-each f mod))
(module-and-uses mod)))
(hash-fold (lambda (sym var n) (1+ n))
0
(let ((t (make-hash-table)))
(module-for-each/nonlocal (lambda (sym var)
(hashq-set! t sym var))
mod)
t)))
(let ((except-+ (resolve-r6rs-interface '(except (guile) +))))
(pass-if "contains"
(equal? (length bindings)
(1- (hash-fold
(lambda (sym var n) (1+ n))
0
(module-obarray (resolve-interface '(guile)))))))
(equal? (bound-name-count except-+)
(1- (bound-name-count (resolve-interface '(guile))))))
(pass-if "does not contain"
(not (memq '+ bindings)))))
(not (module-variable except-+ '+)))))
(with-test-prefix "prefix"
(let ((iface (resolve-r6rs-interface '(prefix (ice-9 q) q:))))