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106 lines
3.4 KiB
Scheme
106 lines
3.4 KiB
Scheme
;;;; Copyright (C) 1999, 2000, 2001, 2003, 2006 Free Software Foundation, Inc.
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;;;;
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;;;; This library is free software; you can redistribute it and/or
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;;;; modify it under the terms of the GNU Lesser General Public
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;;;; License as published by the Free Software Foundation; either
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;;;; version 2.1 of the License, or (at your option) any later version.
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;;;;
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;;;; This library is distributed in the hope that it will be useful,
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;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;;;; Lesser General Public License for more details.
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;;;;
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;;;; You should have received a copy of the GNU Lesser General Public
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;;;; License along with this library; if not, write to the Free Software
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;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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;;;;
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(define-module (oop goops util)
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:export (any every
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mapappend find-duplicate top-level-env top-level-env?
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map* for-each* length* improper->proper)
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:no-backtrace
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)
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;;;
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;;; {Utilities}
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;;;
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(define (any pred lst . rest)
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(if (null? rest) ;fast path
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(and (not (null? lst))
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(let loop ((head (car lst)) (tail (cdr lst)))
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(if (null? tail)
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(pred head)
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(or (pred head)
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(loop (car tail) (cdr tail))))))
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(let ((lsts (cons lst rest)))
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(and (not (any null? lsts))
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(let loop ((heads (map car lsts)) (tails (map cdr lsts)))
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(if (any null? tails)
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(apply pred heads)
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(or (apply pred heads)
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(loop (map car tails) (map cdr tails)))))))))
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(define (every pred lst . rest)
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(if (null? rest) ;fast path
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(or (null? lst)
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(let loop ((head (car lst)) (tail (cdr lst)))
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(if (null? tail)
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(pred head)
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(and (pred head)
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(loop (car tail) (cdr tail))))))
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(let ((lsts (cons lst rest)))
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(or (any null? lsts)
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(let loop ((heads (map car lsts)) (tails (map cdr lsts)))
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(if (any null? tails)
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(apply pred heads)
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(and (apply pred heads)
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(loop (map car tails) (map cdr tails)))))))))
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(define (mapappend func . args)
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(if (memv '() args)
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'()
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(append (apply func (map car args))
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(apply mapappend func (map cdr args)))))
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(define (find-duplicate l) ; find a duplicate in a list; #f otherwise
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(cond
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((null? l) #f)
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((memv (car l) (cdr l)) (car l))
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(else (find-duplicate (cdr l)))))
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(define (top-level-env)
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(let ((mod (current-module)))
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(if mod
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(module-eval-closure mod)
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'())))
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(define (top-level-env? env)
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(or (null? env)
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(procedure? (car env))))
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(define (map* fn . l) ; A map which accepts dotted lists (arg lists
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(cond ; must be "isomorph"
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((null? (car l)) '())
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((pair? (car l)) (cons (apply fn (map car l))
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(apply map* fn (map cdr l))))
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(else (apply fn l))))
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(define (for-each* fn . l) ; A for-each which accepts dotted lists (arg lists
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(cond ; must be "isomorph"
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((null? (car l)) '())
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((pair? (car l)) (apply fn (map car l)) (apply for-each* fn (map cdr l)))
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(else (apply fn l))))
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(define (length* ls)
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(do ((n 0 (+ 1 n))
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(ls ls (cdr ls)))
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((not (pair? ls)) n)))
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(define (improper->proper ls)
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(if (pair? ls)
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(cons (car ls) (improper->proper (cdr ls)))
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(list ls)))
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