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;;; modules.rkt -- module metadata
;; Copyright (C) 2009, 2010 Jose Antonio Ortega Ruiz
;; This program is free software; you can redistribute it and/or
;; modify it under the terms of the Modified BSD License. You should
;; have received a copy of the license along with this program. If
;; not, see <http://www.xfree86.org/3.3.6/COPYRIGHT2.html#5>.
;; Start date: Wed May 06, 2009 02:35
#lang racket
(provide load-module
ensure-module-spec
module-spec->namespace
namespace->module-path-name
module-path-name->name
module-spec->path-name
module-list
module-exports)
(require srfi/13 syntax/modresolve syntax/modcode geiser/enter)
(define (ensure-module-spec spec)
(cond ((symbol? spec) spec)
((not (string? spec)) #f)
(else `(file ,spec))))
(define (module-spec->namespace spec (lang #f))
(let ((spec (ensure-module-spec spec))
(try-lang (lambda (_)
(with-handlers ((exn? (const (current-namespace))))
(and lang
(begin
(load-module lang #f (current-namespace))
(module->namespace lang)))))))
(or (and spec
(with-handlers ((exn? try-lang)) (get-namespace spec)))
(current-namespace))))
(define nowhere (open-output-nowhere))
(define (load-module spec (port #f) (ns #f))
(parameterize ((current-error-port (or port nowhere)))
(enter-module (ensure-module-spec spec))
(when (namespace? ns)
(current-namespace ns))))
(define (namespace->module-path-name ns)
(let ((rmp (variable-reference->resolved-module-path
(eval '(#%variable-reference) ns))))
(and (resolved-module-path? rmp)
(resolved-module-path-name rmp))))
(define (module-spec->path-name spec)
(with-handlers ((exn? (lambda (_) #f)))
(let ((ns (module-spec->namespace (ensure-module-spec spec))))
(namespace->module-path-name ns))))
(define (module-path-name->name path)
(cond ((path? path)
(let* ((path (path->string path))
(cpaths (map (compose path->string path->directory-path)
(current-library-collection-paths)))
(prefix-len (lambda (p)
(let ((pl (string-length p)))
(if (= pl (string-prefix-length p path))
pl
0))))
(lens (map prefix-len cpaths))
(real-path (substring path (apply max lens))))
(if (absolute-path? real-path)
(call-with-values (lambda () (split-path path))
(lambda (_ basename __) (path->string basename)))
(regexp-replace "\\.[^./]*$" real-path ""))))
((eq? path '#%kernel) "(kernel)")
((string? path) path)
((symbol? path) (symbol->string path))
(else "")))
(define (skippable-dir? path)
(call-with-values (lambda () (split-path path))
(lambda (_ basename __)
(member (path->string basename) '(".svn" "compiled")))))
(define path->symbol (compose string->symbol path->string))
(define (path->entry path)
(let ((ext (filename-extension path)))
(and ext
(or (bytes=? ext #"rkt") (bytes=? ext #"ss"))
(let* ((path (path->string path))
(len (- (string-length path) (bytes-length ext) 1)))
(substring path 0 len)))))
(define (visit-module-path path kind acc)
(case kind
((file) (let ((entry (path->entry path)))
(if entry (cons entry acc) acc)))
((dir) (cond ((skippable-dir? path) (values acc #f))
((or (file-exists? (build-path path "main.rkt"))
(file-exists? (build-path path "main.ss")))
(cons (path->string path) acc))
(else acc)))
(else acc)))
(define (find-modules path acc)
(if (directory-exists? path)
(parameterize ((current-directory path))
(fold-files visit-module-path acc))
acc))
(define (known-modules)
(sort (foldl find-modules '() (current-library-collection-paths)) string<?))
(define module-cache #f)
(define (update-module-cache)
(when (not module-cache) (set! module-cache (known-modules))))
(define (module-list)
(update-module-cache)
module-cache)
(define (module-exports mod)
(define (extract-ids ls)
(append-map (lambda (idls)
(map car (cdr idls)))
ls))
(define (classify-ids ids ns)
(let loop ((ids ids) (procs '()) (vars '()))
(cond ((null? ids)
`((procs ,@(reverse procs)) (vars ,@(reverse vars))))
((procedure?
(namespace-variable-value (car ids) #t (const #f) ns))
(loop (cdr ids) (cons (car ids) procs) vars))
(else (loop (cdr ids) procs (cons (car ids) vars))))))
(let-values (((reg syn)
(module-compiled-exports
(get-module-code (resolve-module-path mod #f)))))
(let ((syn (extract-ids syn))
(reg (extract-ids reg)))
`((syntax ,@syn) ,@(classify-ids reg (module-spec->namespace mod))))))
(define (startup)
(thread update-module-cache)
(void))
(startup)
;;; modules.rkt ends here
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