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1052739b74
* module/ice-9/boot-9.scm (export!): New syntax, as export is to module-export!, export! is to module-replace!. I thought that taking up the name `replace' would be presumptuous, hence the name mismatch. * module/ice-9/r6rs-libraries.scm (library): Calculate not only re-exports, but replacements as well.
220 lines
8.7 KiB
Scheme
220 lines
8.7 KiB
Scheme
;;; r6rs-libraries.scm --- Support for the R6RS `library' and `import' forms
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;; Copyright (C) 2010 Free Software Foundation, Inc.
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;;
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;; This library is free software; you can redistribute it and/or
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;; modify it under the terms of the GNU Lesser General Public
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;; License as published by the Free Software Foundation; either
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;; version 3 of the License, or (at your option) any later version.
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;;
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;; This library is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;; Lesser General Public License for more details.
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;;
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;; You should have received a copy of the GNU Lesser General Public
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;; License along with this library; if not, write to the Free Software
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;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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;; This file is included from boot-9.scm and assumes the existence of (and
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;; expands into) procedures and syntactic forms defined therein.
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(define (resolve-r6rs-interface import-spec)
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(define (make-custom-interface mod)
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(let ((iface (make-module)))
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(set-module-kind! iface 'custom-interface)
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(set-module-name! iface (module-name mod))
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iface))
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(define (sym? x) (symbol? (syntax->datum x)))
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(syntax-case import-spec (library only except prefix rename srfi)
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;; (srfi :n ...) -> (srfi srfi-n)
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((library (srfi colon-n rest ... (version ...)))
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(and (and-map sym? #'(srfi rest ...))
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(symbol? (syntax->datum #'colon-n))
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(eqv? (string-ref (symbol->string (syntax->datum #'colon-n)) 0) #\:))
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(let ((srfi-n (string->symbol
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(string-append
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"srfi-"
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(substring (symbol->string (syntax->datum #'colon-n))
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1)))))
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(resolve-r6rs-interface
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#`(library (srfi #,srfi-n (version ...))))))
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((library (name name* ... (version ...)))
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(and-map sym? #'(name name* ...))
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(resolve-interface (syntax->datum #'(name name* ...))
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#:version (syntax->datum #'(version ...))))
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((library (name name* ...))
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(and-map sym? #'(name name* ...))
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(resolve-r6rs-interface #'(library (name name* ... ()))))
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((only import-set identifier ...)
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(and-map sym? #'(identifier ...))
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(let* ((mod (resolve-r6rs-interface #'import-set))
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(iface (make-custom-interface mod)))
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(for-each (lambda (sym)
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(module-add! iface sym
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(or (module-local-variable mod sym)
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(error "no binding `~A' in module ~A"
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sym mod))))
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(syntax->datum #'(identifier ...)))
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iface))
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((except import-set identifier ...)
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(and-map sym? #'(identifier ...))
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(let* ((mod (resolve-r6rs-interface #'import-set))
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(iface (make-custom-interface mod)))
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(module-for-each (lambda (sym var) (module-add! iface sym var)) mod)
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(for-each (lambda (sym)
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(if (module-local-variable iface sym)
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(module-remove! iface sym)
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(error "no binding `~A' in module ~A" sym mod)))
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(syntax->datum #'(identifier ...)))
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iface))
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((prefix import-set identifier)
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(sym? #'identifier)
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(let* ((mod (resolve-r6rs-interface #'import-set))
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(iface (make-custom-interface mod))
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(pre (syntax->datum #'identifier)))
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(module-for-each (lambda (sym var)
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(module-add! iface (symbol-append pre sym) var))
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mod)
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iface))
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((rename import-set (from to) ...)
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(and (and-map sym? #'(from ...)) (and-map sym? #'(to ...)))
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(let* ((mod (resolve-r6rs-interface #'import-set))
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(iface (make-custom-interface mod)))
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(module-for-each (lambda (sym var) (module-add! iface sym var)) mod)
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(let lp ((in (syntax->datum #'((from . to) ...))) (out '()))
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(cond
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((null? in)
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(for-each
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(lambda (pair)
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(if (module-local-variable iface (car pair))
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(error "duplicate binding for `~A' in module ~A"
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(car pair) mod)
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(module-add! iface (car pair) (cdr pair))))
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out)
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iface)
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(else
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(let ((var (or (module-local-variable mod (caar in))
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(error "no binding `~A' in module ~A"
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(caar in) mod))))
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(module-remove! iface (caar in))
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(lp (cdr in) (acons (cdar in) var out))))))))
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((name name* ... (version ...))
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(and-map sym? #'(name name* ...))
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(resolve-r6rs-interface #'(library (name name* ... (version ...)))))
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((name name* ...)
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(and-map sym? #'(name name* ...))
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(resolve-r6rs-interface #'(library (name name* ... ()))))))
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(define-syntax library
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(lambda (stx)
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(define (compute-exports ifaces specs)
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(define (re-export? sym)
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(or-map (lambda (iface) (module-local-variable iface sym)) ifaces))
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(define (replace? sym)
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(module-local-variable the-scm-module sym))
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(let lp ((specs specs) (e '()) (r '()) (x '()))
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(syntax-case specs (rename)
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(() (values e r x))
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(((rename (from to) ...) . rest)
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(and (and-map identifier? #'(from ...))
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(and-map identifier? #'(to ...)))
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(let lp2 ((in #'((from . to) ...)) (e e) (r r) (x x))
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(syntax-case in ()
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(() (lp #'rest e r x))
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(((from . to) . in)
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(cond
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((re-export? (syntax->datum #'from))
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(lp2 #'in e (cons #'(from . to) r) x))
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((replace? (syntax->datum #'from))
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(lp2 #'in e r (cons #'(from . to) x)))
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(else
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(lp2 #'in (cons #'(from . to) e) r x)))))))
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((id . rest)
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(identifier? #'id)
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(let ((sym (syntax->datum #'id)))
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(cond
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((re-export? sym)
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(lp #'rest e (cons #'id r) x))
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((replace? sym)
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(lp #'rest e r (cons #'id x)))
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(else
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(lp #'rest (cons #'id e) r x))))))))
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(syntax-case stx (export import)
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((_ (name name* ...)
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(export espec ...)
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(import ispec ...)
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body ...)
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(and-map identifier? #'(name name* ...))
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;; Add () as the version.
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#'(library (name name* ... ())
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(export espec ...)
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(import ispec ...)
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body ...))
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((_ (name name* ... (version ...))
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(export espec ...)
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(import ispec ...)
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body ...)
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(and-map identifier? #'(name name* ...))
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(call-with-values
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(lambda ()
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(compute-exports
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(map (lambda (im)
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(syntax-case im (for)
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((for import-set import-level ...)
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(resolve-r6rs-interface #'import-set))
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(import-set (resolve-r6rs-interface #'import-set))))
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#'(ispec ...))
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#'(espec ...)))
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(lambda (exports re-exports replacements)
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(with-syntax (((e ...) exports)
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((r ...) re-exports)
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((x ...) replacements))
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;; It would be nice to push the module that was current before the
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;; definition, and pop it after the library definition, but I
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;; actually can't see a way to do that. Helper procedures perhaps,
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;; around a fluid that is rebound in save-module-excursion? Patches
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;; welcome!
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#'(begin
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(define-module (name name* ...)
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#:pure
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#:version (version ...))
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(import ispec)
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...
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(export e ...)
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(re-export r ...)
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(export! x ...)
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(@@ (name name* ...) body)
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...))))))))
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(define-syntax import
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(lambda (stx)
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(define (strip-for import-set)
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(syntax-case import-set (for)
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((for import-set import-level ...)
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#'import-set)
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(import-set
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#'import-set)))
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(syntax-case stx ()
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((_ import-set ...)
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(with-syntax (((library-reference ...) (map strip-for #'(import-set ...))))
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#'(eval-when (eval load compile expand)
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(let ((iface (resolve-r6rs-interface 'library-reference)))
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(call-with-deferred-observers
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(lambda ()
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(module-use-interfaces! (current-module) (list iface)))))
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...
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(if #f #f)))))))
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