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;; completions.ss -- completion support
;; Copyright (C) 2009 Jose Antonio Ortega Ruiz
;; Author: Jose Antonio Ortega Ruiz <jao@gnu.org>
;; Start date: Sun Apr 26, 2009 19:02
;; 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:
;; Finding completions of given prefixes.
;;; Code:
#lang scheme
(provide completions)
(require srfi/13)
(define (completions prefix . context)
(let ((context (and (not (null? context)) (car context)))
(prefix? (lambda (s) (string-prefix? prefix s))))
(append (filter prefix? (map symbol->string (local-bindings context)))
(sort (filter prefix? (map symbol->string (namespace-mapped-symbols)))
string<?))))
(define (pair->list pair)
(let loop ((d pair) (s '()))
(cond ((null? d) (reverse s))
((symbol? d) (reverse (cons d s)))
(else (loop (cdr d) (cons (car d) s))))))
(define (local-bindings form)
(define (body f) (if (> (length f) 2) (cddr f) '()))
(let loop ((form form) (bindings '()))
(cond ((not (pair? form)) bindings)
((list? (car form))
(loop (cdr form) (append (local-bindings (car form)) bindings)))
((and (list? form) (< (length form) 2)) bindings)
((memq (car form) '(define define* lambda))
(loop (body form) (append (pair->list (cadr form)) bindings)))
((and (memq (car form) '(let let* letrec letrec*))
(list? (cadr form)))
(loop (body form) (append (map car (cadr form)) bindings)))
((and (eq? 'let (car form)) (symbol? (cadr form)))
(loop (cons 'let (body form)) (cons (cadr form) bindings)))
(else (loop (cdr form) bindings)))))
;;; completions.ss ends here
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