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71 lines
2.2 KiB
Scheme
71 lines
2.2 KiB
Scheme
;;;; Copyright (C) 1999, 2000, 2001, 2003, 2006, 2008 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 (mapappend find-duplicate top-level-env top-level-env?
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map* for-each* length* improper->proper)
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:use-module (srfi srfi-1)
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:re-export (any every)
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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 mapappend append-map)
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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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