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- ;;;; Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
- ;;;;
- ;;;; This program 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 2, or (at your option)
- ;;;; any later version.
- ;;;;
- ;;;; This program 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 software; see the file COPYING. If not, write to
- ;;;; the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
- ;;;; Boston, MA 02111-1307 USA
- ;;;;
- ;;;; As a special exception, the Free Software Foundation gives permission
- ;;;; for additional uses of the text contained in its release of GUILE.
- ;;;;
- ;;;; The exception is that, if you link the GUILE library with other files
- ;;;; to produce an executable, this does not by itself cause the
- ;;;; resulting executable to be covered by the GNU General Public License.
- ;;;; Your use of that executable is in no way restricted on account of
- ;;;; linking the GUILE library code into it.
- ;;;;
- ;;;; This exception does not however invalidate any other reasons why
- ;;;; the executable file might be covered by the GNU General Public License.
- ;;;;
- ;;;; This exception applies only to the code released by the
- ;;;; Free Software Foundation under the name GUILE. If you copy
- ;;;; code from other Free Software Foundation releases into a copy of
- ;;;; GUILE, as the General Public License permits, the exception does
- ;;;; not apply to the code that you add in this way. To avoid misleading
- ;;;; anyone as to the status of such modified files, you must delete
- ;;;; this exception notice from them.
- ;;;;
- ;;;; If you write modifications of your own for GUILE, it is your choice
- ;;;; whether to permit this exception to apply to your modifications.
- ;;;; If you do not wish that, delete this exception notice.
- ;;;;
-
-
- (define-module (oop goops util)
- :export (any every filter
- mapappend find-duplicate top-level-env top-level-env?
- map* for-each* length* improper->proper)
- :no-backtrace
- )
-
-
- ;;;
- ;;; {Utilities}
- ;;;
-
- (define (any pred lst . rest)
- (if (null? rest) ;fast path
- (and (not (null? lst))
- (let loop ((head (car lst)) (tail (cdr lst)))
- (if (null? tail)
- (pred head)
- (or (pred head)
- (loop (car tail) (cdr tail))))))
- (let ((lsts (cons lst rest)))
- (and (not (any null? lsts))
- (let loop ((heads (map car lsts)) (tails (map cdr lsts)))
- (if (any null? tails)
- (apply pred heads)
- (or (apply pred heads)
- (loop (map car tails) (map cdr tails)))))))))
-
- (define (every pred lst . rest)
- (if (null? rest) ;fast path
- (or (null? lst)
- (let loop ((head (car lst)) (tail (cdr lst)))
- (if (null? tail)
- (pred head)
- (and (pred head)
- (loop (car tail) (cdr tail))))))
- (let ((lsts (cons lst rest)))
- (or (any null? lsts)
- (let loop ((heads (map car lsts)) (tails (map cdr lsts)))
- (if (any null? tails)
- (apply pred heads)
- (and (apply pred heads)
- (loop (map car tails) (map cdr tails)))))))))
-
- (define (filter test? list)
- (cond ((null? list) '())
- ((test? (car list)) (cons (car list) (filter test? (cdr list))))
- (else (filter test? (cdr list)))))
-
- (define (mapappend func . args)
- (if (memv '() args)
- '()
- (append (apply func (map car args))
- (apply mapappend func (map cdr args)))))
-
- (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)))
-