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;; introspection.scm -- name says it all
;; Copyright (C) 2009 Jose Antonio Ortega Ruiz
;; Author: Jose Antonio Ortega Ruiz <jao@gnu.org>
;; Start date: Sun Feb 08, 2009 18:44
;; This file is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 3 of the License, or
;; (at your option) any later version.
;; This file is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;; Comentary:
;; Procedures introspecting on scheme objects and their properties.
;;; Code:
(define-module (geiser introspection)
#:export (arguments completions symbol-location docstring)
#:use-module (system vm program)
#:use-module (ice-9 session)
#:use-module (ice-9 documentation)
#:use-module (srfi srfi-1))
(define (arguments sym . syms)
(let loop ((sym sym) (syms syms))
(cond ((obj-args (symbol->obj sym)) => (lambda (args)
(cons sym (apply args-alist args))))
((null? syms) #f)
(else (loop (car syms) (cdr syms))))))
(define (args-alist args opt module)
(list (cons 'required args)
(cons 'optional (or opt '()))
(cons 'module (cond ((module? module) (module-name module))
((list? module) module)
(else '())))))
(define (symbol->obj sym)
(and (symbol? sym)
(module-defined? (current-module) sym)
(module-ref (current-module) sym)))
(define (obj-args obj)
(cond ((not obj) #f)
((program? obj) (program-args obj))
((procedure? obj) (procedure-args obj))
((macro? obj) (macro-args obj))
(else #f)))
(define (symbol-module sym)
(call/cc
(lambda (k)
(apropos-fold (lambda (module name var init)
(if (eq? name sym) (k (module-name module)) init))
#f
(symbol->string sym)
(apropos-fold-accessible (current-module))))))
(define (program-args program)
(let* ((arity (program-arity program))
(arg-no (first arity))
(opt (> (second arity) 0))
(args (map first (take (program-bindings program) arg-no))))
(list (if opt (drop-right args 1) args)
(and opt (last args))
(program-module program))))
(define (procedure-args proc)
(let ((name (procedure-name proc)))
(cond ((procedure-source proc) => (lambda (src)
(procedure-args-from-source name src)))
(else (let* ((arity (procedure-property proc 'arity))
(req (first arity))
(opt (third arity)))
(list (map (lambda (n)
(string->symbol (format "arg~A" (+ 1 n))))
(iota req))
(and opt 'rest)
(and name (symbol-module name))))))))
(define (procedure-args-from-source name src)
(let ((formals (cadr src)))
(cond ((list? formals) (list formals #f (symbol-module name)))
((pair? formals) (let ((req (car formals))
(opt (cdr formals)))
(list (if (list? req) req (list req))
opt
(symbol-module name))))
(else #f))))
(define (macro-args macro)
(let ((prog (macro-transformer macro)))
(if prog
(obj-args prog)
(list '(...) #f #f))))
(define (completions prefix)
(sort! (map symbol->string
(apropos-internal (string-append "^" prefix)))
string<?))
(define (symbol-location sym)
(cond ((symbol-module sym) => make-location-from-module-name)
(else '())))
(define (make-location file line)
(list (cons 'file (if (string? file) file '()))
(cons 'line (if (number? line) (+ 1 line) '()))))
(define module-filename (@@ (ice-9 session) module-filename))
(define (make-location-from-module-name name)
(make-location (module-filename name) #f))
(define (display-docstring sym)
(let ((obj (symbol->obj sym)))
(if obj
(let* ((args (obj-args obj))
(req (and args (car args)))
(opt (and args (cadr args)))
(signature (if args
(if (not opt) `(,sym ,@req) `(,sym ,@req . ,opt))
sym))
(type (cond ((macro? obj) "A macro")
((procedure? obj) "A procedure")
((program? obj) "A compiled program")
(else "An object")))
(modname (symbol-module sym))
(doc (object-documentation obj)))
(display signature)
(newline)
(display type)
(if modname (begin (display " in module ")
(display modname)))
(newline)
(if doc (begin (display doc)))))))
(define (docstring sym)
(with-output-to-string
(lambda () (display-docstring sym))))
;;; introspection.scm ends here
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