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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 (proc-args completions)
#:use-module (system vm program)
#:use-module (ice-9 session)
#:use-module (srfi srfi-1))
(define (proc-args proc)
(let ((proc (and (symbol? proc)
(module-bound? (current-module) proc)
(eval proc (current-module)))))
(cond ((not proc) #f)
((program? proc) (program-args proc))
((procedure? proc) (procedure-args proc))
((macro? proc) (macro-args proc))
(else #f))))
(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))))
(format-args (if opt (drop-right args 1) args)
(and opt (last args))
(program-module program))))
(define (procedure-args proc)
(let* ((arity (procedure-property proc 'arity))
(req (first arity))
(opt (third arity))
(env (procedure-environment proc)))
(format-args (map (lambda (n)
(string->symbol (format "arg~A" (+ 1 n))))
(iota req))
(and opt 'rest)
(and (not (null? env)) env))))
(define (macro-args macro)
;; check if return value is a procedure
(let ((prog (macro-transformer macro)))
(if prog
(program-args prog)
(format-args '(...) #f #f))))
(define (format-args args opt module)
(list (cons 'required args)
(cons 'optional (or opt '()))
(cons 'module (if module (module-name module) '()))))
(define (completions prefix)
(sort! (map symbol->string
(apropos-internal (string-append "^" prefix)))
string<?))
;;; introspection.scm ends here
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