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190 lines
5.9 KiB
EmacsLisp
190 lines
5.9 KiB
EmacsLisp
;;; cl-compat.el --- Common Lisp extensions for GNU Emacs Lisp (compatibility)
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;; Copyright (C) 1993, 2004 Free Software Foundation, Inc.
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;; Author: Dave Gillespie <daveg@synaptics.com>
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;; Version: 2.02
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;; Keywords: extensions
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs 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
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; These are extensions to Emacs Lisp that provide a degree of
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;; Common Lisp compatibility, beyond what is already built-in
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;; in Emacs Lisp.
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;;
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;; This package was written by Dave Gillespie; it is a complete
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;; rewrite of Cesar Quiroz's original cl.el package of December 1986.
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;;
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;; This package works with Emacs 18, Emacs 19, and Lucid Emacs 19.
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;;
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;; Bug reports, comments, and suggestions are welcome!
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;; This file contains emulations of internal routines of the older
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;; CL package which users may have called directly from their code.
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;; Use (require 'cl-compat) to get these routines.
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;; See cl.el for Change Log.
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;;; Code:
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;; Require at load-time, but not when compiling cl-compat.
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(or (featurep 'cl) (require 'cl))
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;;; Keyword routines not supported by new package.
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(defmacro defkeyword (x &optional doc)
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(list* 'defconst x (list 'quote x) (and doc (list doc))))
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(defun keyword-of (sym)
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(or (keywordp sym) (keywordp (intern (format ":%s" sym)))))
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;;; Multiple values. Note that the new package uses a different
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;;; convention for multiple values. The following definitions
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;;; emulate the old convention; all function names have been changed
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;;; by capitalizing the first letter: Values, Multiple-value-*,
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;;; to avoid conflict with the new-style definitions in cl-macs.
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(put 'Multiple-value-bind 'lisp-indent-function 2)
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(put 'Multiple-value-setq 'lisp-indent-function 2)
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(put 'Multiple-value-call 'lisp-indent-function 1)
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(put 'Multiple-value-prog1 'lisp-indent-function 1)
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(defvar *mvalues-values* nil)
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(defun Values (&rest val-forms)
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(setq *mvalues-values* val-forms)
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(car val-forms))
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(defun Values-list (val-forms)
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(apply 'values val-forms))
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(defmacro Multiple-value-list (form)
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(list 'let* (list '(*mvalues-values* nil) (list '*mvalues-temp* form))
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'(or (and (eq *mvalues-temp* (car *mvalues-values*)) *mvalues-values*)
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(list *mvalues-temp*))))
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(defmacro Multiple-value-call (function &rest args)
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(list 'apply function
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(cons 'append
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(mapcar (function (lambda (x) (list 'Multiple-value-list x)))
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args))))
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(defmacro Multiple-value-bind (vars form &rest body)
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(list* 'multiple-value-bind vars (list 'Multiple-value-list form) body))
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(defmacro Multiple-value-setq (vars form)
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(list 'multiple-value-setq vars (list 'Multiple-value-list form)))
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(defmacro Multiple-value-prog1 (form &rest body)
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(list 'prog1 form (list* 'let '((*mvalues-values* nil)) body)))
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;;; Routines for parsing keyword arguments.
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(defun build-klist (arglist keys &optional allow-others)
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(let ((res (Multiple-value-call 'mapcar* 'cons (unzip-lists arglist))))
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(or allow-others
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(let ((bad (set-difference (mapcar 'car res) keys)))
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(if bad (error "Bad keywords: %s not in %s" bad keys))))
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res))
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(defun extract-from-klist (klist key &optional def)
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(let ((res (assq key klist))) (if res (cdr res) def)))
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(defun keyword-argument-supplied-p (klist key)
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(assq key klist))
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(defun elt-satisfies-test-p (item elt klist)
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(let ((test-not (cdr (assq ':test-not klist)))
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(test (cdr (assq ':test klist)))
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(key (cdr (assq ':key klist))))
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(if key (setq elt (funcall key elt)))
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(if test-not (not (funcall test-not item elt))
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(funcall (or test 'eql) item elt))))
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;;; Rounding functions with old-style multiple value returns.
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(defun cl-floor (a &optional b) (Values-list (floor* a b)))
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(defun cl-ceiling (a &optional b) (Values-list (ceiling* a b)))
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(defun cl-round (a &optional b) (Values-list (round* a b)))
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(defun cl-truncate (a &optional b) (Values-list (truncate* a b)))
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(defun safe-idiv (a b)
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(let* ((q (/ (abs a) (abs b)))
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(s (* (signum a) (signum b))))
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(Values q (- a (* s q b)) s)))
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;; Internal routines.
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(defun pair-with-newsyms (oldforms)
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(let ((newsyms (mapcar (lambda (x) (make-symbol "--cl-var--")) oldforms)))
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(Values (mapcar* 'list newsyms oldforms) newsyms)))
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(defun zip-lists (evens odds)
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(mapcan 'list evens odds))
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(defun unzip-lists (list)
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(let ((e nil) (o nil))
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(while list
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(setq e (cons (car list) e) o (cons (cadr list) o) list (cddr list)))
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(Values (nreverse e) (nreverse o))))
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(defun reassemble-argslists (list)
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(let ((n (apply 'min (mapcar 'length list))) (res nil))
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(while (>= (setq n (1- n)) 0)
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(setq res (cons (mapcar (function (lambda (x) (elt x n))) list) res)))
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res))
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(defun duplicate-symbols-p (list)
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(let ((res nil))
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(while list
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(if (memq (car list) (cdr list)) (setq res (cons (car list) res)))
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(setq list (cdr list)))
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res))
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;;; Setf internals.
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(defun setnth (n list x)
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(setcar (nthcdr n list) x))
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(defun setnthcdr (n list x)
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(setcdr (nthcdr (1- n) list) x))
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(defun setelt (seq n x)
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(if (consp seq) (setcar (nthcdr n seq) x) (aset seq n x)))
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;;; Functions omitted: case-clausify, check-do-stepforms, check-do-endforms,
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;;; extract-do-inits, extract-do[*]-steps, select-stepping-forms,
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;;; elt-satisfies-if[-not]-p, with-keyword-args, mv-bind-clausify,
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;;; all names with embedded `$'.
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(provide 'cl-compat)
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;; arch-tag: 9996bb4f-aaf5-4592-b436-bf64759a3163
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;;; cl-compat.el ends here
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