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Diffstat (limited to 'module/oop/goops/util.scm')
-rw-r--r-- | module/oop/goops/util.scm | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/module/oop/goops/util.scm b/module/oop/goops/util.scm new file mode 100644 index 000000000..69bb898bf --- /dev/null +++ b/module/oop/goops/util.scm @@ -0,0 +1,71 @@ +;;;; 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))) |