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;;;; Copyright (C) 1999, 2000, 2001, 2003, 2006, 2008 Free Software Foundation, Inc.
;;;;
;;;; This library is free software; you can redistribute it and/or
;;;; modify it under the terms of the GNU Lesser General Public
;;;; License as published by the Free Software Foundation; either
;;;; version 3 of the License, or (at your option) any later version.
;;;;
;;;; This library 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
;;;; Lesser General Public License for more details.
;;;;
;;;; You should have received a copy of the GNU Lesser General Public
;;;; License along with this library; if not, write to the Free Software
;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
;;;;
(define-module (oop goops util)
:export (mapappend find-duplicate top-level-env top-level-env?
map* for-each* length* improper->proper)
:use-module (srfi srfi-1)
:re-export (any every)
:no-backtrace
)
;;;
;;; {Utilities}
;;;
(define mapappend append-map)
(define (find-duplicate l) ; find a duplicate in a list; #f otherwise
(cond
((null? l) #f)
((memv (car l) (cdr l)) (car l))
(else (find-duplicate (cdr l)))))
(define (top-level-env)
(let ((mod (current-module)))
(if mod
(module-eval-closure mod)
'())))
(define (top-level-env? env)
(or (null? env)
(procedure? (car env))))
(define (map* fn . l) ; A map which accepts dotted lists (arg lists
(cond ; must be "isomorph"
((null? (car l)) '())
((pair? (car l)) (cons (apply fn (map car l))
(apply map* fn (map cdr l))))
(else (apply fn l))))
(define (for-each* fn . l) ; A for-each which accepts dotted lists (arg lists
(cond ; must be "isomorph"
((null? (car l)) '())
((pair? (car l)) (apply fn (map car l)) (apply for-each* fn (map cdr l)))
(else (apply fn l))))
(define (length* ls)
(do ((n 0 (+ 1 n))
(ls ls (cdr ls)))
((not (pair? ls)) n)))
(define (improper->proper ls)
(if (pair? ls)
(cons (car ls) (improper->proper (cdr ls)))
(list ls)))
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