New upstream version 2.19.65

[lilypond.git] / guile18 / oop / goops / util.scm

diff --git a/guile18/oop/goops/util.scm b/guile18/oop/goops/util.scm
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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 2.1 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
+;;;; 
+\f
+
+(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)))