281 lines
9.8 KiB
Scheme
281 lines
9.8 KiB
Scheme
;;; Copyright (c) 2006, 2007 Abdulaziz Ghuloum and Kent Dybvig
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;;;
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;;; Permission is hereby granted, free of charge, to any person obtaining a
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;;; copy of this software and associated documentation files (the "Software"),
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;;; to deal in the Software without restriction, including without limitation
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;;; the rights to use, copy, modify, merge, publish, distribute, sublicense,
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;;; and/or sell copies of the Software, and to permit persons to whom the
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;;; Software is furnished to do so, subject to the following conditions:
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;;;
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;;; The above copyright notice and this permission notice shall be included in
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;;; all copies or substantial portions of the Software.
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;;;
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;;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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;;; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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;;; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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;;; THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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;;; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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;;; FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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;;; DEALINGS IN THE SOFTWARE.
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(library (psyntax library-manager)
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(export imported-label->binding library-subst installed-libraries
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visit-library library-name library-version library-exists?
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find-library-by-name install-library library-spec invoke-library
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extend-library-subst! extend-library-env! current-library-expander
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current-library-collection)
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(import (rnrs) (psyntax compat) (rnrs r5rs))
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(define (make-collection)
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(let ((set '()))
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(define (set-cons x ls)
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(cond
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((memq x ls) ls)
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(else (cons x ls))))
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(case-lambda
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(() set)
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((x) (set! set (set-cons x set))))))
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(define current-library-collection
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;;; this works now because make-collection is a lambda
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;;; binding and this turns into a complex binding as far
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;;; as letrec is concerned. It will be more ok once we do
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;;; letrec*.
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(make-parameter (make-collection)
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(lambda (x)
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(unless (procedure? x)
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(error 'current-library-collection "not a procedure" x))
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x)))
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(define-record library
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(id name version imp* vis* inv* subst env visit-state invoke-state visible?)
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(lambda (x p)
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(unless (library? x)
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(error 'record-type-printer "not a library"))
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(display
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(format "#<library ~s>"
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(if (null? (library-version x))
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(library-name x)
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(append (library-name x) (list (library-version x)))))
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p)))
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(define (find-dependencies ls)
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(cond
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((null? ls) '())
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(else (error 'find-dependencies "cannot handle deps yet"))))
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(define (find-library-by pred)
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(let f ((ls ((current-library-collection))))
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(cond
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((null? ls) #f)
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((pred (car ls)) (car ls))
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(else (f (cdr ls))))))
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(define library-path
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(make-parameter
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'(".")
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(lambda (x)
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(if (and (list? x) (for-all string? x))
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;(map values x)
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(map (lambda (x) x) x)
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(error 'library-path "not a list of strings" x)))))
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(define (library-name->file-name x)
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(let-values (((p extract) (open-string-output-port)))
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(define (display-hex n)
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(cond
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((<= 0 n 9) (display n p))
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(else (display
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(integer->char
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(+ (char->integer #\A)
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(- n 10)))
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p))))
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(let f ((ls x))
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(cond
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((null? ls) (display ".ss" p))
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(else
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(display "/" p)
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(for-each
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(lambda (c)
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(cond
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((or (char<=? #\a c #\z)
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(char<=? #\A c #\Z)
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(char<=? #\0 c #\9)
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(memv c '(#\- #\. #\_ #\~)))
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(display c p))
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(else
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(display "%" p)
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(let ((n (char->integer c)))
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(display-hex (quotient n 16))
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(display-hex (remainder n 16))))))
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(string->list
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(symbol->string (car ls))))
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(f (cdr ls)))))
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(extract)))
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(define file-locator
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(make-parameter
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(lambda (x)
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(let ((str (library-name->file-name x)))
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(let f ((ls (library-path)))
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(and (pair? ls)
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(let ((name (string-append (car ls) str)))
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(if (file-exists? name)
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name
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(f (cdr ls))))))))
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(lambda (f)
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(if (procedure? f)
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f
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(error 'file-locator "not a procedure" f)))))
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(define library-locator
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(make-parameter
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(lambda (x)
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(let ((file-name ((file-locator) x)))
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(and (string? file-name)
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(with-input-from-file file-name read))))
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(lambda (f)
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(if (procedure? f)
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f
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(error 'library-locator
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"not a procedure" f)))))
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(define current-library-expander
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(make-parameter
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(lambda (x)
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(error 'library-expander "not initialized"))
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(lambda (f)
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(if (procedure? f)
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f
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(error 'library-expander
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"not a procedure" f)))))
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(define external-pending-libraries
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(make-parameter '()))
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(define (find-external-library name)
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(when (member name (external-pending-libraries))
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(error #f "circular attempt to import library was detected"
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name))
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(parameterize ((external-pending-libraries
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(cons name (external-pending-libraries))))
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(let ((lib-expr ((library-locator) name)))
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(unless lib-expr
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(error #f "cannot find library" name))
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((current-library-expander) lib-expr)
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(or (find-library-by
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(lambda (x) (equal? (library-name x) name)))
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(error #f
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"handling external library did not yield the currect library"
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name)))))
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(define (find-library-by-name name)
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(or (find-library-by
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(lambda (x) (equal? (library-name x) name)))
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(find-external-library name)))
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(define (library-exists? name)
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(and (find-library-by
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(lambda (x) (equal? (library-name x) name)))
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#t))
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(define (find-library-by-spec/die spec)
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(let ((id (car spec)))
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(or (find-library-by
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(lambda (x) (eq? id (library-id x))))
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(error #f "cannot find library with required spec" spec))))
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(define label->binding-table (make-eq-hashtable))
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(define (install-library-record lib)
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(let ((exp-env (library-env lib)))
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(for-each
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(lambda (x)
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(let ((label (car x)) (binding (cdr x)))
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(let ((binding
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(case (car binding)
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((global)
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(cons 'global (cons lib (cdr binding))))
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((global-macro)
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(cons 'global-macro (cons lib (cdr binding))))
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((global-macro!)
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(cons 'global-macro! (cons lib (cdr binding))))
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(else binding))))
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(hashtable-set! label->binding-table label binding))))
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exp-env))
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((current-library-collection) lib))
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(define (install-library id name ver imp* vis* inv*
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exp-subst exp-env visit-code invoke-code visible?)
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(let ((imp-lib* (map find-library-by-spec/die imp*))
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(vis-lib* (map find-library-by-spec/die vis*))
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(inv-lib* (map find-library-by-spec/die inv*)))
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(unless (and (symbol? id) (list? name) (list? ver))
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(error 'install-library "invalid spec with id/name/ver" id name ver))
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(when (library-exists? name)
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(error 'install-library "library is already installed" name))
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(let ((lib (make-library id name ver imp-lib* vis-lib* inv-lib*
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exp-subst exp-env visit-code invoke-code
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visible?)))
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(install-library-record lib))))
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(define extend-library-subst!
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(lambda (lib sym label)
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(set-library-subst! lib
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(cons (cons sym label) (library-subst lib)))))
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(define extend-library-env!
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(lambda (lib label binding)
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(set-library-env! lib
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(cons (cons label binding) (library-env lib)))
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(hashtable-set! label->binding-table label binding)))
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(define (imported-label->binding lab)
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(hashtable-ref label->binding-table lab #f))
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(define (invoke-library lib)
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(let ((invoke (library-invoke-state lib)))
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(when (procedure? invoke)
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(set-library-invoke-state! lib
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(lambda () (error 'invoke "circularity detected" lib)))
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(for-each invoke-library (library-inv* lib))
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(set-library-invoke-state! lib
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(lambda () (error 'invoke "first invoke did not return" lib)))
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(invoke)
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(set-library-invoke-state! lib #t))))
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(define (visit-library lib)
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(let ((visit (library-visit-state lib)))
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(when (procedure? visit)
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(set-library-visit-state! lib
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(lambda () (error 'visit "circularity detected" lib)))
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(for-each invoke-library (library-vis* lib))
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(set-library-visit-state! lib
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(lambda () (error 'invoke "first visit did not return" lib)))
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(visit)
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(set-library-visit-state! lib #t))))
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(define (invoke-library-by-spec spec)
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(invoke-library (find-library-by-spec/die spec)))
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(define installed-libraries
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(case-lambda
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((all?)
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(let f ((ls ((current-library-collection))))
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(cond
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((null? ls) '())
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((or all? (library-visible? (car ls)))
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(cons (car ls) (f (cdr ls))))
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(else (f (cdr ls))))))
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(() (installed-libraries #f))))
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(define library-spec
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(lambda (x)
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(unless (library? x)
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(error 'library-spec "not a library" x))
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(list (library-id x) (library-name x) (library-version x))))
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)
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