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;;; modules.rkt -- module metadata
;; Copyright (C) 2009, 2010, 2011 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-name
namespace->module-path-name
module-path-name->name
module-spec->path-name
module-path-index->name
module-identifiers
module-list
submodules)
(require srfi/13
syntax/modcode
syntax/modresolve
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) (current #t))
(define (try-lang)
(and lang
(with-handlers ([exn? (const #f)])
(load-module lang #f (current-namespace))
(module->namespace lang))))
(or (get-namespace spec)
(try-lang)
(and current (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->rmp ns)
(with-handlers ([exn? (const #f)])
(variable-reference->resolved-module-path
(eval '(#%variable-reference) (or ns (current-namespace))))))
(define (namespace->module-path-name ns (p #f))
(let ([rmp (namespace->rmp ns)])
(or (and (resolved-module-path? rmp)
(resolved-module-path-name rmp))
p)))
(define (module-spec->path-name spec)
(and (symbol? spec)
(or (get-path spec)
(register-path spec
(namespace->module-path-name
(module-spec->namespace spec #f #f))))))
(define unknown-module-name "*unresolved module*")
(define (module-path-name->name path)
(cond [(path? path) (module-path-name->name (path->string path))]
;; [(eq? path '#%kernel) "(kernel)"]
[(string? path)
(let* ([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)
(let-values ([(_ base __) (split-path path)])
(path->string base))
(regexp-replace "\\.[^./]*$" real-path "")))]
[(symbol? path) (symbol->string path)]
[else unknown-module-name]))
(define (module-path-index->name mpi)
(let ([rmp (module-path-index-resolve mpi)])
(if (resolved-module-path? rmp)
(module-path-name->name (resolved-module-path-name rmp))
unknown-module-name)))
(define (namespace->module-name ns (p #f))
(module-path-name->name (namespace->module-path-name ns p)))
(define (module-identifiers mod)
(define (extract-ids ls)
(append-map (lambda (idls)
(map car (cdr idls)))
ls))
(let-values ([(reg syn)
(module-compiled-exports
(get-module-code (resolve-module-path
(ensure-module-spec mod) #f)))])
(values (extract-ids reg) (extract-ids syn))))
(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"))
(not (bytes=? (bytes-append #"main" ext) (path->bytes path)))
(let* ([path (path->string path)]
[len (- (string-length path) (bytes-length ext) 1)])
(substring path 0 len)))))
(define main-rkt (build-path "main.rkt"))
(define main-ss (build-path "main.ss"))
(define ((visit-module-path reg?) path kind acc)
(define (register e p)
(when reg?
(register-path (string->symbol e) (build-path (current-directory) p)))
(values (cons e acc) reg?))
(define (get-main path main)
(and (file-exists? main) (build-path path main)))
(define (find-main path)
(parameterize ([current-directory path])
(or (get-main path main-rkt) (get-main path main-ss))))
(case kind
[(file) (let ([entry (path->entry path)])
(if (not entry) acc (register entry path)))]
[(dir) (cond [(skippable-dir? path) (values acc #f)]
[(find-main path) => (curry register (path->string path))]
[else (values acc reg?)])]
[else acc]))
(define ((find-modules reg?) path acc)
(if (directory-exists? path)
(parameterize ([current-directory path])
(fold-files (visit-module-path reg?) acc))
acc))
(define (take-while pred lst)
(let loop ([lst lst] [acc '()])
(cond [(null? lst) (reverse acc)]
[(pred (car lst)) (loop (cdr lst) (cons (car lst) acc))]
[else (reverse acc)])))
(define (submodules mod)
(let* ([mod-name (if (symbol? mod) mod (get-mod mod))]
[mod-str (and (symbol? mod-name) (symbol->string mod-name))])
(if mod-str
(let ([ms (member mod-str (module-list))])
(and ms
(take-while (lambda (m) (string-prefix? mod-str m))
(cdr ms))))
(find-submodules mod))))
(define (find-submodules path)
(and (path-string? path)
(let-values ([(dir base ign) (split-path path)])
(and (or (equal? base main-rkt)
(equal? base main-ss))
(map (lambda (m) (path->string (build-path dir m)))
(remove "main" ((find-modules #f) dir '())))))))
(define (known-modules)
(sort (foldl (find-modules #t)
'()
(current-library-collection-paths))
string<?))
(define registered (make-hash))
(define registered-paths (make-hash))
(define (get-path mod)
(hash-ref registered mod #f))
(define (get-mod path)
(hash-ref registered-paths path #f))
(define (register-path mod path)
(hash-set! registered mod path)
(hash-set! registered-paths path mod)
path)
(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 (startup)
(thread update-module-cache)
(void))
(startup)
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