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-;;; cl-compat.el --- Common Lisp extensions for GNU Emacs Lisp (compatibility)
-
-;; Copyright (C) 1993 Free Software Foundation, Inc.
-
-;; Author: Dave Gillespie <daveg@synaptics.com>
-;; Version: 2.02
-;; Keywords: extensions
-
-;; This file is part of GNU Emacs.
-
-;; GNU Emacs 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.
-
-;; GNU Emacs 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 GNU Emacs; see the file COPYING. If not, write to the
-;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-;; Boston, MA 02111-1307, USA.
-
-;;; Commentary:
-
-;; These are extensions to Emacs Lisp that provide a degree of
-;; Common Lisp compatibility, beyond what is already built-in
-;; in Emacs Lisp.
-;;
-;; This package was written by Dave Gillespie; it is a complete
-;; rewrite of Cesar Quiroz's original cl.el package of December 1986.
-;;
-;; This package works with Emacs 18, Emacs 19, and Lucid Emacs 19.
-;;
-;; Bug reports, comments, and suggestions are welcome!
-
-;; This file contains emulations of internal routines of the older
-;; CL package which users may have called directly from their code.
-;; Use (require 'cl-compat) to get these routines.
-
-;; See cl.el for Change Log.
-
-
-;;; Code:
-
-;; Require at load-time, but not when compiling cl-compat.
-(or (featurep 'cl) (require 'cl))
-
-
-;;; Keyword routines not supported by new package.
-
-(defmacro defkeyword (x &optional doc)
- (list* 'defconst x (list 'quote x) (and doc (list doc))))
-
-(defun keywordp (sym)
- (and (symbolp sym) (eq (aref (symbol-name sym) 0) ?\:) (set sym sym)))
-
-(defun keyword-of (sym)
- (or (keywordp sym) (keywordp (intern (format ":%s" sym)))))
-
-
-;;; Multiple values. Note that the new package uses a different
-;;; convention for multiple values. The following definitions
-;;; emulate the old convention; all function names have been changed
-;;; by capitalizing the first letter: Values, Multiple-value-*,
-;;; to avoid conflict with the new-style definitions in cl-macs.
-
-(put 'Multiple-value-bind 'lisp-indent-function 2)
-(put 'Multiple-value-setq 'lisp-indent-function 2)
-(put 'Multiple-value-call 'lisp-indent-function 1)
-(put 'Multiple-value-prog1 'lisp-indent-function 1)
-
-(defvar *mvalues-values* nil)
-
-(defun Values (&rest val-forms)
- (setq *mvalues-values* val-forms)
- (car val-forms))
-
-(defun Values-list (val-forms)
- (apply 'values val-forms))
-
-(defmacro Multiple-value-list (form)
- (list 'let* (list '(*mvalues-values* nil) (list '*mvalues-temp* form))
- '(or (and (eq *mvalues-temp* (car *mvalues-values*)) *mvalues-values*)
- (list *mvalues-temp*))))
-
-(defmacro Multiple-value-call (function &rest args)
- (list 'apply function
- (cons 'append
- (mapcar (function (lambda (x) (list 'Multiple-value-list x)))
- args))))
-
-(defmacro Multiple-value-bind (vars form &rest body)
- (list* 'multiple-value-bind vars (list 'Multiple-value-list form) body))
-
-(defmacro Multiple-value-setq (vars form)
- (list 'multiple-value-setq vars (list 'Multiple-value-list form)))
-
-(defmacro Multiple-value-prog1 (form &rest body)
- (list 'prog1 form (list* 'let '((*mvalues-values* nil)) body)))
-
-
-;;; Routines for parsing keyword arguments.
-
-(defun build-klist (arglist keys &optional allow-others)
- (let ((res (Multiple-value-call 'mapcar* 'cons (unzip-lists arglist))))
- (or allow-others
- (let ((bad (set-difference (mapcar 'car res) keys)))
- (if bad (error "Bad keywords: %s not in %s" bad keys))))
- res))
-
-(defun extract-from-klist (klist key &optional def)
- (let ((res (assq key klist))) (if res (cdr res) def)))
-
-(defun keyword-argument-supplied-p (klist key)
- (assq key klist))
-
-(defun elt-satisfies-test-p (item elt klist)
- (let ((test-not (cdr (assq ':test-not klist)))
- (test (cdr (assq ':test klist)))
- (key (cdr (assq ':key klist))))
- (if key (setq elt (funcall key elt)))
- (if test-not (not (funcall test-not item elt))
- (funcall (or test 'eql) item elt))))
-
-
-;;; Rounding functions with old-style multiple value returns.
-
-(defun cl-floor (a &optional b) (Values-list (floor* a b)))
-(defun cl-ceiling (a &optional b) (Values-list (ceiling* a b)))
-(defun cl-round (a &optional b) (Values-list (round* a b)))
-(defun cl-truncate (a &optional b) (Values-list (truncate* a b)))
-
-(defun safe-idiv (a b)
- (let* ((q (/ (abs a) (abs b)))
- (s (* (signum a) (signum b))))
- (Values q (- a (* s q b)) s)))
-
-
-;; Internal routines.
-
-(defun pair-with-newsyms (oldforms)
- (let ((newsyms (mapcar (function (lambda (x) (gensym))) oldforms)))
- (Values (mapcar* 'list newsyms oldforms) newsyms)))
-
-(defun zip-lists (evens odds)
- (mapcan 'list evens odds))
-
-(defun unzip-lists (list)
- (let ((e nil) (o nil))
- (while list
- (setq e (cons (car list) e) o (cons (cadr list) o) list (cddr list)))
- (Values (nreverse e) (nreverse o))))
-
-(defun reassemble-argslists (list)
- (let ((n (apply 'min (mapcar 'length list))) (res nil))
- (while (>= (setq n (1- n)) 0)
- (setq res (cons (mapcar (function (lambda (x) (elt x n))) list) res)))
- res))
-
-(defun duplicate-symbols-p (list)
- (let ((res nil))
- (while list
- (if (memq (car list) (cdr list)) (setq res (cons (car list) res)))
- (setq list (cdr list)))
- res))
-
-
-;;; Setf internals.
-
-(defun setnth (n list x)
- (setcar (nthcdr n list) x))
-
-(defun setnthcdr (n list x)
- (setcdr (nthcdr (1- n) list) x))
-
-(defun setelt (seq n x)
- (if (consp seq) (setcar (nthcdr n seq) x) (aset seq n x)))
-
-
-;;; Functions omitted: case-clausify, check-do-stepforms, check-do-endforms,
-;;; extract-do-inits, extract-do[*]-steps, select-stepping-forms,
-;;; elt-satisfies-if[-not]-p, with-keyword-args, mv-bind-clausify,
-;;; all names with embedded `$'.
-
-
-(provide 'cl-compat)
-
-;;; cl-compat.el ends here
-