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;;; cl-extra.el --- Common Lisp features, part 2  -*- lexical-binding: t -*-
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;; Copyright (C) 1993, 2000-2018 Free Software Foundation, Inc.
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;; Author: Dave Gillespie <daveg@synaptics.com>
;; Keywords: extensions
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;; Package: emacs
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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 3 of the License, or
;; (at your option) any later version.
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;; 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
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;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; 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.
;;
;; Bug reports, comments, and suggestions are welcome!

;; This file contains portions of the Common Lisp extensions
;; package which are autoloaded since they are relatively obscure.

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;;; Code:
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(require 'cl-lib)
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;;; Type coercion.

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;;;###autoload
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(defun cl-coerce (x type)
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  "Coerce OBJECT to type TYPE.
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TYPE is a Common Lisp type specifier.
\n(fn OBJECT TYPE)"
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  (cond ((eq type 'list) (if (listp x) x (append x nil)))
	((eq type 'vector) (if (vectorp x) x (vconcat x)))
	((eq type 'string) (if (stringp x) x (concat x)))
	((eq type 'array) (if (arrayp x) x (vconcat x)))
	((and (eq type 'character) (stringp x) (= (length x) 1)) (aref x 0))
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	((and (eq type 'character) (symbolp x))
         (cl-coerce (symbol-name x) type))
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	((eq type 'float) (float x))
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	((cl-typep x type) x)
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	(t (error "Can't coerce %s to type %s" x type))))


;;; Predicates.

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;;;###autoload
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(defun cl-equalp (x y)
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  "Return t if two Lisp objects have similar structures and contents.
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This is like `equal', except that it accepts numerically equal
numbers of different types (float vs. integer), and also compares
strings case-insensitively."
  (cond ((eq x y) t)
	((stringp x)
	 (and (stringp y) (= (length x) (length y))
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	      (or (string-equal x y)
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		  (string-equal (downcase x) (downcase y))))) ;Lazy but simple!
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	((numberp x)
	 (and (numberp y) (= x y)))
	((consp x)
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	 (while (and (consp x) (consp y) (cl-equalp (car x) (car y)))
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	   (setq x (cdr x) y (cdr y)))
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	 (and (not (consp x)) (cl-equalp x y)))
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	((vectorp x)
	 (and (vectorp y) (= (length x) (length y))
	      (let ((i (length x)))
		(while (and (>= (setq i (1- i)) 0)
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			    (cl-equalp (aref x i) (aref y i))))
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		(< i 0))))
	(t (equal x y))))


;;; Control structures.

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;;;###autoload
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(defun cl--mapcar-many (cl-func cl-seqs &optional acc)
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  (if (cdr (cdr cl-seqs))
      (let* ((cl-res nil)
	     (cl-n (apply 'min (mapcar 'length cl-seqs)))
	     (cl-i 0)
	     (cl-args (copy-sequence cl-seqs))
	     cl-p1 cl-p2)
	(setq cl-seqs (copy-sequence cl-seqs))
	(while (< cl-i cl-n)
	  (setq cl-p1 cl-seqs cl-p2 cl-args)
	  (while cl-p1
	    (setcar cl-p2
		    (if (consp (car cl-p1))
			(prog1 (car (car cl-p1))
			  (setcar cl-p1 (cdr (car cl-p1))))
		      (aref (car cl-p1) cl-i)))
	    (setq cl-p1 (cdr cl-p1) cl-p2 (cdr cl-p2)))
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	  (if acc
	      (push (apply cl-func cl-args) cl-res)
	    (apply cl-func cl-args))
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	  (setq cl-i (1+ cl-i)))
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	(and acc (nreverse cl-res)))
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    (let ((cl-res nil)
	  (cl-x (car cl-seqs))
	  (cl-y (nth 1 cl-seqs)))
      (let ((cl-n (min (length cl-x) (length cl-y)))
	    (cl-i -1))
	(while (< (setq cl-i (1+ cl-i)) cl-n)
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	  (let ((val (funcall cl-func
			      (if (consp cl-x) (pop cl-x) (aref cl-x cl-i))
			      (if (consp cl-y) (pop cl-y) (aref cl-y cl-i)))))
	    (when acc
	      (push val cl-res)))))
	(and acc (nreverse cl-res)))))
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;;;###autoload
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(defun cl-map (cl-type cl-func cl-seq &rest cl-rest)
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  "Map a FUNCTION across one or more SEQUENCEs, returning a sequence.
TYPE is the sequence type to return.
\n(fn TYPE FUNCTION SEQUENCE...)"
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  (let ((cl-res (apply 'cl-mapcar cl-func cl-seq cl-rest)))
    (and cl-type (cl-coerce cl-res cl-type))))
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;;;###autoload
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(defun cl-maplist (cl-func cl-list &rest cl-rest)
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  "Map FUNCTION to each sublist of LIST or LISTs.
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Like `cl-mapcar', except applies to lists and their cdr's rather than to
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the elements themselves.
\n(fn FUNCTION LIST...)"
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  (if cl-rest
      (let ((cl-res nil)
	    (cl-args (cons cl-list (copy-sequence cl-rest)))
	    cl-p)
	(while (not (memq nil cl-args))
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	  (push (apply cl-func cl-args) cl-res)
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	  (setq cl-p cl-args)
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	  (while cl-p (setcar cl-p (cdr (pop cl-p)))))
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	(nreverse cl-res))
    (let ((cl-res nil))
      (while cl-list
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	(push (funcall cl-func cl-list) cl-res)
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	(setq cl-list (cdr cl-list)))
      (nreverse cl-res))))

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;;;###autoload
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(defun cl-mapc (cl-func cl-seq &rest cl-rest)
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  "Like `cl-mapcar', but does not accumulate values returned by the function.
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\n(fn FUNCTION SEQUENCE...)"
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  (if cl-rest
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      (if (or (cdr cl-rest) (nlistp cl-seq) (nlistp (car cl-rest)))
          (progn
            (cl--mapcar-many cl-func (cons cl-seq cl-rest))
            cl-seq)
        (let ((cl-x cl-seq) (cl-y (car cl-rest)))
          (while (and cl-x cl-y)
            (funcall cl-func (pop cl-x) (pop cl-y)))
          cl-seq))
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    (mapc cl-func cl-seq)))
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;;;###autoload
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(defun cl-mapl (cl-func cl-list &rest cl-rest)
  "Like `cl-maplist', but does not accumulate values returned by the function.
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\n(fn FUNCTION LIST...)"
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  (if cl-rest
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      (let ((cl-args (cons cl-list (copy-sequence cl-rest)))
	    cl-p)
	(while (not (memq nil cl-args))
          (apply cl-func cl-args)
	  (setq cl-p cl-args)
	  (while cl-p (setcar cl-p (cdr (pop cl-p))))))
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    (let ((cl-p cl-list))
      (while cl-p (funcall cl-func cl-p) (setq cl-p (cdr cl-p)))))
  cl-list)

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;;;###autoload
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(defun cl-mapcan (cl-func cl-seq &rest cl-rest)
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  "Like `cl-mapcar', but nconc's together the values returned by the function.
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\n(fn FUNCTION SEQUENCE...)"
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  (if cl-rest
      (apply 'nconc (apply 'cl-mapcar cl-func cl-seq cl-rest))
    (mapcan cl-func cl-seq)))
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;;;###autoload
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(defun cl-mapcon (cl-func cl-list &rest cl-rest)
  "Like `cl-maplist', but nconc's together the values returned by the function.
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\n(fn FUNCTION LIST...)"
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  (apply 'nconc (apply 'cl-maplist cl-func cl-list cl-rest)))
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;;;###autoload
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(defun cl-some (cl-pred cl-seq &rest cl-rest)
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  "Return true if PREDICATE is true of any element of SEQ or SEQs.
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If so, return the true (non-nil) value returned by PREDICATE.
\n(fn PREDICATE SEQ...)"
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  (if (or cl-rest (nlistp cl-seq))
      (catch 'cl-some
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	(apply 'cl-map nil
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	       (function (lambda (&rest cl-x)
			   (let ((cl-res (apply cl-pred cl-x)))
			     (if cl-res (throw 'cl-some cl-res)))))
	       cl-seq cl-rest) nil)
    (let ((cl-x nil))
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      (while (and cl-seq (not (setq cl-x (funcall cl-pred (pop cl-seq))))))
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      cl-x)))

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;;;###autoload
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(defun cl-every (cl-pred cl-seq &rest cl-rest)
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  "Return true if PREDICATE is true of every element of SEQ or SEQs.
\n(fn PREDICATE SEQ...)"
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  (if (or cl-rest (nlistp cl-seq))
      (catch 'cl-every
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	(apply 'cl-map nil
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	       (function (lambda (&rest cl-x)
			   (or (apply cl-pred cl-x) (throw 'cl-every nil))))
	       cl-seq cl-rest) t)
    (while (and cl-seq (funcall cl-pred (car cl-seq)))
      (setq cl-seq (cdr cl-seq)))
    (null cl-seq)))

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;;;###autoload
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(defun cl-notany (cl-pred cl-seq &rest cl-rest)
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  "Return true if PREDICATE is false of every element of SEQ or SEQs.
\n(fn PREDICATE SEQ...)"
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  (not (apply 'cl-some cl-pred cl-seq cl-rest)))
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;;;###autoload
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(defun cl-notevery (cl-pred cl-seq &rest cl-rest)
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  "Return true if PREDICATE is false of some element of SEQ or SEQs.
\n(fn PREDICATE SEQ...)"
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  (not (apply 'cl-every cl-pred cl-seq cl-rest)))
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;;;###autoload
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(defun cl--map-keymap-recursively (cl-func-rec cl-map &optional cl-base)
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  (or cl-base
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      (setq cl-base (copy-sequence [0])))
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  (map-keymap
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   (function
    (lambda (cl-key cl-bind)
      (aset cl-base (1- (length cl-base)) cl-key)
      (if (keymapp cl-bind)
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	  (cl--map-keymap-recursively
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	   cl-func-rec cl-bind
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	   (vconcat cl-base (list 0)))
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	(funcall cl-func-rec cl-base cl-bind))))
   cl-map))

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;;;###autoload
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(defun cl--map-intervals (cl-func &optional cl-what cl-prop cl-start cl-end)
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  (or cl-what (setq cl-what (current-buffer)))
  (if (bufferp cl-what)
      (let (cl-mark cl-mark2 (cl-next t) cl-next2)
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	(with-current-buffer cl-what
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	  (setq cl-mark (copy-marker (or cl-start (point-min))))
	  (setq cl-mark2 (and cl-end (copy-marker cl-end))))
	(while (and cl-next (or (not cl-mark2) (< cl-mark cl-mark2)))
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	  (setq cl-next (if cl-prop (next-single-property-change
				     cl-mark cl-prop cl-what)
			  (next-property-change cl-mark cl-what))
		cl-next2 (or cl-next (with-current-buffer cl-what
				       (point-max))))
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	  (funcall cl-func (prog1 (marker-position cl-mark)
			     (set-marker cl-mark cl-next2))
		   (if cl-mark2 (min cl-next2 cl-mark2) cl-next2)))
	(set-marker cl-mark nil) (if cl-mark2 (set-marker cl-mark2 nil)))
    (or cl-start (setq cl-start 0))
    (or cl-end (setq cl-end (length cl-what)))
    (while (< cl-start cl-end)
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      (let ((cl-next (or (if cl-prop (next-single-property-change
				      cl-start cl-prop cl-what)
			   (next-property-change cl-start cl-what))
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			 cl-end)))
	(funcall cl-func cl-start (min cl-next cl-end))
	(setq cl-start cl-next)))))

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;;;###autoload
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(defun cl--map-overlays (cl-func &optional cl-buffer cl-start cl-end cl-arg)
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  (or cl-buffer (setq cl-buffer (current-buffer)))
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  (let (cl-ovl)
    (with-current-buffer cl-buffer
      (setq cl-ovl (overlay-lists))
      (if cl-start (setq cl-start (copy-marker cl-start)))
      (if cl-end (setq cl-end (copy-marker cl-end))))
    (setq cl-ovl (nconc (car cl-ovl) (cdr cl-ovl)))
    (while (and cl-ovl
		(or (not (overlay-start (car cl-ovl)))
		    (and cl-end (>= (overlay-start (car cl-ovl)) cl-end))
		    (and cl-start (<= (overlay-end (car cl-ovl)) cl-start))
		    (not (funcall cl-func (car cl-ovl) cl-arg))))
      (setq cl-ovl (cdr cl-ovl)))
    (if cl-start (set-marker cl-start nil))
    (if cl-end (set-marker cl-end nil))))
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;;; Support for `setf'.
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;;;###autoload
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(defun cl--set-frame-visible-p (frame val)
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  (cond ((null val) (make-frame-invisible frame))
	((eq val 'icon) (iconify-frame frame))
	(t (make-frame-visible frame)))
  val)


;;; Numbers.

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;;;###autoload
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(defun cl-gcd (&rest args)
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  "Return the greatest common divisor of the arguments."
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  (let ((a (or (pop args) 0)))
    (dolist (b args)
      (while (/= b 0)
        (setq b (% a (setq a b)))))
    (abs a)))
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;;;###autoload
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(defun cl-lcm (&rest args)
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  "Return the least common multiple of the arguments."
  (if (memq 0 args)
      0
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    (let ((a (or (pop args) 1)))
      (dolist (b args)
        (setq a (* (/ a (cl-gcd a b)) b)))
      (abs a))))
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;;;###autoload
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(defun cl-isqrt (x)
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  "Return the integer square root of the argument."
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  (if (and (integerp x) (> x 0))
      (let ((g (cond ((<= x 100) 10) ((<= x 10000) 100)
		     ((<= x 1000000) 1000) (t x)))
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	    g2)
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	(while (< (setq g2 (/ (+ g (/ x g)) 2)) g)
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	  (setq g g2))
	g)
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    (if (eq x 0) 0 (signal 'arith-error nil))))
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;;;###autoload
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(defun cl-floor (x &optional y)
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  "Return a list of the floor of X and the fractional part of X.
With two arguments, return floor and remainder of their quotient."
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  (let ((q (floor x y)))
    (list q (- x (if y (* y q) q)))))
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;;;###autoload
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(defun cl-ceiling (x &optional y)
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  "Return a list of the ceiling of X and the fractional part of X.
With two arguments, return ceiling and remainder of their quotient."
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  (let ((res (cl-floor x y)))
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    (if (= (car (cdr res)) 0) res
      (list (1+ (car res)) (- (car (cdr res)) (or y 1))))))

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;;;###autoload
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(defun cl-truncate (x &optional y)
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  "Return a list of the integer part of X and the fractional part of X.
With two arguments, return truncation and remainder of their quotient."
  (if (eq (>= x 0) (or (null y) (>= y 0)))
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      (cl-floor x y) (cl-ceiling x y)))
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;;;###autoload
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(defun cl-round (x &optional y)
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  "Return a list of X rounded to the nearest integer and the remainder.
With two arguments, return rounding and remainder of their quotient."
  (if y
      (if (and (integerp x) (integerp y))
	  (let* ((hy (/ y 2))
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		 (res (cl-floor (+ x hy) y)))
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	    (if (and (= (car (cdr res)) 0)
		     (= (+ hy hy) y)
		     (/= (% (car res) 2) 0))
		(list (1- (car res)) hy)
	      (list (car res) (- (car (cdr res)) hy))))
	(let ((q (round (/ x y))))
	  (list q (- x (* q y)))))
    (if (integerp x) (list x 0)
      (let ((q (round x)))
	(list q (- x q))))))

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;;;###autoload
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(defun cl-mod (x y)
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  "The remainder of X divided by Y, with the same sign as Y."
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  (nth 1 (cl-floor x y)))
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;;;###autoload
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(defun cl-rem (x y)
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  "The remainder of X divided by Y, with the same sign as X."
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  (nth 1 (cl-truncate x y)))
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;;;###autoload
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(defun cl-signum (x)
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  "Return 1 if X is positive, -1 if negative, 0 if zero."
  (cond ((> x 0) 1) ((< x 0) -1) (t 0)))
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;;;###autoload
(cl-defun cl-parse-integer (string &key start end radix junk-allowed)
  "Parse integer from the substring of STRING from START to END.
STRING may be surrounded by whitespace chars (chars with syntax ` ').
Other non-digit chars are considered junk.
RADIX is an integer between 2 and 36, the default is 10.  Signal
an error if the substring between START and END cannot be parsed
as an integer unless JUNK-ALLOWED is non-nil."
  (cl-check-type string string)
  (let* ((start (or start 0))
	 (len	(length string))
	 (end   (or end len))
	 (radix (or radix 10)))
    (or (<= start end len)
	(error "Bad interval: [%d, %d)" start end))
    (cl-flet ((skip-whitespace ()
		(while (and (< start end)
			    (= 32 (char-syntax (aref string start))))
		  (setq start (1+ start)))))
      (skip-whitespace)
      (let ((sign (cl-case (and (< start end) (aref string start))
		    (?+ (cl-incf start) +1)
		    (?- (cl-incf start) -1)
		    (t  +1)))
	    digit sum)
	(while (and (< start end)
		    (setq digit (cl-digit-char-p (aref string start) radix)))
	  (setq sum (+ (* (or sum 0) radix) digit)
		start (1+ start)))
	(skip-whitespace)
	(cond ((and junk-allowed (null sum)) sum)
	      (junk-allowed (* sign sum))
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	      ((or (/= start end) (null sum))
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	       (error "Not an integer string: `%s'" string))
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	      (t (* sign sum)))))))

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;; Random numbers.

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(defun cl--random-time ()
  (let* ((time (copy-sequence (current-time-string))) (i (length time)) (v 0))
    (while (>= (cl-decf i) 0) (setq v (+ (* v 3) (aref time i))))
    v))

;;;###autoload (autoload 'cl-random-state-p "cl-extra")
(cl-defstruct (cl--random-state
               (:copier nil)
               (:predicate cl-random-state-p)
               (:constructor nil)
               (:constructor cl--make-random-state (vec)))
  (i -1) (j 30) vec)

(defvar cl--random-state (cl--make-random-state (cl--random-time)))

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;;;###autoload
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(defun cl-random (lim &optional state)
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  "Return a random nonnegative number less than LIM, an integer or float.
Optional second arg STATE is a random-state object."
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  (or state (setq state cl--random-state))
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  ;; Inspired by "ran3" from Numerical Recipes.  Additive congruential method.
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  (let ((vec (cl--random-state-vec state)))
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    (if (integerp vec)
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	(let ((i 0) (j (- 1357335 (abs (% vec 1357333)))) (k 1))
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	  (setf (cl--random-state-vec state)
                (setq vec (make-vector 55 nil)))
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	  (aset vec 0 j)
	  (while (> (setq i (% (+ i 21) 55)) 0)
	    (aset vec i (setq j (prog1 k (setq k (- j k))))))
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	  (while (< (setq i (1+ i)) 200) (cl-random 2 state))))
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    (let* ((i (cl-callf (lambda (x) (% (1+ x) 55)) (cl--random-state-i state)))
	   (j (cl-callf (lambda (x) (% (1+ x) 55)) (cl--random-state-j state)))
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	   (n (logand 8388607 (aset vec i (- (aref vec i) (aref vec j))))))
      (if (integerp lim)
	  (if (<= lim 512) (% n lim)
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	    (if (> lim 8388607) (setq n (+ (lsh n 9) (cl-random 512 state))))
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	    (let ((mask 1023))
	      (while (< mask (1- lim)) (setq mask (1+ (+ mask mask))))
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	      (if (< (setq n (logand n mask)) lim) n (cl-random lim state))))
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	(* (/ n '8388608e0) lim)))))

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;;;###autoload
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(defun cl-make-random-state (&optional state)
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  "Return a copy of random-state STATE, or of the internal state if omitted.
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If STATE is t, return a new state object seeded from the time of day."
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  (unless state (setq state cl--random-state))
  (if (cl-random-state-p state)
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      (copy-sequence state)
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    (cl--make-random-state (if (integerp state) state (cl--random-time)))))
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;; Implementation limits.

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(defun cl--finite-do (func a b)
  (condition-case _
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      (let ((res (funcall func a b)))   ; check for IEEE infinity
	(and (numberp res) (/= res (/ res 2)) res))
    (arith-error nil)))

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;;;###autoload
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(defun cl-float-limits ()
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  "Initialize the Common Lisp floating-point parameters.
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This sets the values of: `cl-most-positive-float', `cl-most-negative-float',
`cl-least-positive-float', `cl-least-negative-float', `cl-float-epsilon',
`cl-float-negative-epsilon', `cl-least-positive-normalized-float', and
`cl-least-negative-normalized-float'."
  (or cl-most-positive-float (not (numberp '2e1))
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      (let ((x '2e0) y z)
	;; Find maximum exponent (first two loops are optimizations)
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	(while (cl--finite-do '* x x) (setq x (* x x)))
	(while (cl--finite-do '* x (/ x 2)) (setq x (* x (/ x 2))))
	(while (cl--finite-do '+ x x) (setq x (+ x x)))
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	(setq z x y (/ x 2))
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	;; Now cl-fill in 1's in the mantissa.
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	(while (and (cl--finite-do '+ x y) (/= (+ x y) x))
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	  (setq x (+ x y) y (/ y 2)))
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	(setq cl-most-positive-float x
	      cl-most-negative-float (- x))
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	;; Divide down until mantissa starts rounding.
	(setq x (/ x z) y (/ 16 z) x (* x y))
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	(while (condition-case _ (and (= x (* (/ x 2) 2)) (> (/ y 2) 0))
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		 (arith-error nil))
	  (setq x (/ x 2) y (/ y 2)))
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	(setq cl-least-positive-normalized-float y
	      cl-least-negative-normalized-float (- y))
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	;; Divide down until value underflows to zero.
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	(setq x (/ z) y x)
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	(while (condition-case _ (> (/ x 2) 0) (arith-error nil))
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	  (setq x (/ x 2)))
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	(setq cl-least-positive-float x
	      cl-least-negative-float (- x))
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	(setq x '1e0)
	(while (/= (+ '1e0 x) '1e0) (setq x (/ x 2)))
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	(setq cl-float-epsilon (* x 2))
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	(setq x '1e0)
	(while (/= (- '1e0 x) '1e0) (setq x (/ x 2)))
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	(setq cl-float-negative-epsilon (* x 2))))
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  nil)


;;; Sequence functions.

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;;;###autoload
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(defun cl-subseq (seq start &optional end)
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  "Return the subsequence of SEQ from START to END.
If END is omitted, it defaults to the length of the sequence.
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If START or END is negative, it counts from the end.
Signal an error if START or END are outside of the sequence (i.e
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too large if positive or too small if negative)."
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  (declare (gv-setter
            (lambda (new)
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              (macroexp-let2 nil new new
		`(progn (cl-replace ,seq ,new :start1 ,start :end1 ,end)
			,new)))))
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  (cond ((or (stringp seq) (vectorp seq)) (substring seq start end))
        ((listp seq)
         (let (len
               (errtext (format "Bad bounding indices: %s, %s" start end)))
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           (and end (< end 0) (setq end (+ end (setq len (length seq)))))
           (if (< start 0) (setq start (+ start (or len (setq len (length seq))))))
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           (unless (>= start 0)
             (error "%s" errtext))
           (when (> start 0)
             (setq seq (nthcdr (1- start) seq))
             (or seq (error "%s" errtext))
             (setq seq (cdr seq)))
           (if end
               (let ((res nil))
                 (while (and (>= (setq end (1- end)) start) seq)
                   (push (pop seq) res))
                 (or (= (1+ end) start) (error "%s" errtext))
                 (nreverse res))
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             (copy-sequence seq))))
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        (t (error "Unsupported sequence: %s" seq))))
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;;;###autoload
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(defun cl-concatenate (type &rest sequences)
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  "Concatenate, into a sequence of type TYPE, the argument SEQUENCEs.
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\n(fn TYPE SEQUENCE...)"
  (pcase type
    (`vector (apply #'vconcat sequences))
    (`string (apply #'concat sequences))
    (`list (apply #'append (append sequences '(nil))))
    (_ (error "Not a sequence type name: %S" type))))
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;;; List functions.

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;;;###autoload
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(defun cl-revappend (x y)
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  "Equivalent to (append (reverse X) Y)."
  (nconc (reverse x) y))

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;;;###autoload
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(defun cl-nreconc (x y)
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  "Equivalent to (nconc (nreverse X) Y)."
  (nconc (nreverse x) y))

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;;;###autoload
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(defun cl-list-length (x)
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  "Return the length of list X.  Return nil if list is circular."
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  (let ((n 0) (fast x) (slow x))
    (while (and (cdr fast) (not (and (eq fast slow) (> n 0))))
      (setq n (+ n 2) fast (cdr (cdr fast)) slow (cdr slow)))
    (if fast (if (cdr fast) nil (1+ n)) n)))

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;;;###autoload
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(defun cl-tailp (sublist list)
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  "Return true if SUBLIST is a tail of LIST."
  (while (and (consp list) (not (eq sublist list)))
    (setq list (cdr list)))
  (if (numberp sublist) (equal sublist list) (eq sublist list)))

;;; Property lists.

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;;;###autoload
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(defun cl-get (sym tag &optional def)
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  "Return the value of SYMBOL's PROPNAME property, or DEFAULT if none.
\n(fn SYMBOL PROPNAME &optional DEFAULT)"
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  (declare (compiler-macro cl--compiler-macro-get)
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           (gv-setter (lambda (store) (ignore def) `(put ,sym ,tag ,store))))
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  (cl-getf (symbol-plist sym) tag def))
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(autoload 'cl--compiler-macro-get "cl-macs")
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;;;###autoload
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(defun cl-getf (plist tag &optional def)
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  "Search PROPLIST for property PROPNAME; return its value or DEFAULT.
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PROPLIST is a list of the sort returned by `symbol-plist'.
\n(fn PROPLIST PROPNAME &optional DEFAULT)"
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  (declare (gv-expander
            (lambda (do)
              (gv-letplace (getter setter) plist
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                (macroexp-let2* nil ((k tag) (d def))
                  (funcall do `(cl-getf ,getter ,k ,d)
			   (lambda (v)
			     (macroexp-let2 nil val v
			       `(progn
				  ,(funcall setter
					    `(cl--set-getf ,getter ,k ,val))
				  ,val)))))))))
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  (let ((val-tail (cdr-safe (plist-member plist tag))))
    (if val-tail (car val-tail) def)))
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;;;###autoload
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(defun cl--set-getf (plist tag val)
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  (let ((val-tail (cdr-safe (plist-member plist tag))))
    (if val-tail (progn (setcar val-tail val) plist)
      (cl-list* tag val plist))))
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;;;###autoload
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(defun cl--do-remf (plist tag)
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  (let ((p (cdr plist)))
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    ;; Can't use `plist-member' here because it goes to the cons-cell
    ;; of TAG and we need the one before.
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    (while (and (cdr p) (not (eq (car (cdr p)) tag))) (setq p (cdr (cdr p))))
    (and (cdr p) (progn (setcdr p (cdr (cdr (cdr p)))) t))))

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;;;###autoload
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(defun cl-remprop (sym tag)
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  "Remove from SYMBOL's plist the property PROPNAME and its value.
\n(fn SYMBOL PROPNAME)"
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  (let ((plist (symbol-plist sym)))
    (if (and plist (eq tag (car plist)))
	(progn (setplist sym (cdr (cdr plist))) t)
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      (cl--do-remf plist tag))))
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;;; Streams.

;;;###autoload
(defun cl-fresh-line (&optional stream)
  "Output a newline unless already at the beginning of a line."
  (terpri stream 'ensure))

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;;; Some debugging aids.

(defun cl-prettyprint (form)
  "Insert a pretty-printed rendition of a Lisp FORM in current buffer."
  (let ((pt (point)) last)
    (insert "\n" (prin1-to-string form) "\n")
    (setq last (point))
    (goto-char (1+ pt))
    (while (search-forward "(quote " last t)
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      (delete-char -7)
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      (insert "'")
      (forward-sexp)
      (delete-char 1))
    (goto-char (1+ pt))
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    (cl--do-prettyprint)))
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(defun cl--do-prettyprint ()
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  (skip-chars-forward " ")
  (if (looking-at "(")
      (let ((skip (or (looking-at "((") (looking-at "(prog")
		      (looking-at "(unwind-protect ")
		      (looking-at "(function (")
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		      (looking-at "(cl--block-wrapper ")))
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	    (two (or (looking-at "(defun ") (looking-at "(defmacro ")))
	    (let (or (looking-at "(let\\*? ") (looking-at "(while ")))
	    (set (looking-at "(p?set[qf] ")))
	(if (or skip let
		(progn
		  (forward-sexp)
		  (and (>= (current-column) 78) (progn (backward-sexp) t))))
	    (let ((nl t))
	      (forward-char 1)
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	      (cl--do-prettyprint)
	      (or skip (looking-at ")") (cl--do-prettyprint))
	      (or (not two) (looking-at ")") (cl--do-prettyprint))
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	      (while (not (looking-at ")"))
		(if set (setq nl (not nl)))
		(if nl (insert "\n"))
		(lisp-indent-line)
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		(cl--do-prettyprint))
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	      (forward-char 1))))
    (forward-sexp)))

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;;;###autoload
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(defun cl-prettyexpand (form &optional full)
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  "Expand macros in FORM and insert the pretty-printed result.
Optional argument FULL non-nil means to expand all macros,
including `cl-block' and `cl-eval-when'."
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  (message "Expanding...")
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  (let ((cl--compiling-file full)
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	(byte-compile-macro-environment nil))
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    (setq form (macroexpand-all form
                                (and (not full) '((cl-block) (cl-eval-when)))))
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    (message "Formatting...")
    (prog1 (cl-prettyprint form)
      (message ""))))

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;;; Integration into the online help system.

(eval-when-compile (require 'cl-macs))  ;Explicitly, for cl--find-class.
(require 'help-mode)

;; FIXME: We could go crazy and add another entry so describe-symbol can be
;; used with the slot names of CL structs (and/or EIEIO objects).
(add-to-list 'describe-symbol-backends
             `(nil ,#'cl-find-class ,(lambda (s _b _f) (cl-describe-type s))))

(defconst cl--typedef-regexp
  (concat "(" (regexp-opt '("defclass" "defstruct" "cl-defstruct"
                            "cl-deftype" "deftype"))
          "[ \t\r\n]+%s[ \t\r\n]+"))
(with-eval-after-load 'find-func
  (defvar find-function-regexp-alist)
  (add-to-list 'find-function-regexp-alist
               `(define-type . cl--typedef-regexp)))

(define-button-type 'cl-help-type
  :supertype 'help-function-def
  'help-function #'cl-describe-type
  'help-echo (purecopy "mouse-2, RET: describe this type"))

(define-button-type 'cl-type-definition
  :supertype 'help-function-def
  'help-echo (purecopy "mouse-2, RET: find type definition"))

(declare-function help-fns-short-filename "help-fns" (filename))

;;;###autoload
(defun cl-find-class (type) (cl--find-class type))

;;;###autoload
(defun cl-describe-type (type)
  "Display the documentation for type TYPE (a symbol)."
  (interactive
   (let ((str (completing-read "Describe type: " obarray #'cl-find-class t)))
     (if (<= (length str) 0)
         (user-error "Abort!")
       (list (intern str)))))
  (help-setup-xref (list #'cl-describe-type type)
                   (called-interactively-p 'interactive))
  (save-excursion
    (with-help-window (help-buffer)
      (with-current-buffer standard-output
        (let ((class (cl-find-class type)))
          (if class
              (cl--describe-class type class)
            ;; FIXME: Describe other types (the built-in ones, or those from
            ;; cl-deftype).
            (user-error "Unknown type %S" type))))
      (with-current-buffer standard-output
        ;; Return the text we displayed.
        (buffer-string)))))

(defun cl--describe-class (type &optional class)
  (unless class (setq class (cl--find-class type)))
  (let ((location (find-lisp-object-file-name type 'define-type))
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        (metatype (type-of class)))
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    (insert (symbol-name type)
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            (substitute-command-keys " is a type (of kind `"))
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    (help-insert-xref-button (symbol-name metatype)
                             'cl-help-type metatype)
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    (insert (substitute-command-keys "')"))
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    (when location
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      (insert (substitute-command-keys " in `"))
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      (help-insert-xref-button
       (help-fns-short-filename location)
       'cl-type-definition type location 'define-type)
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      (insert (substitute-command-keys "'")))
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    (insert ".\n")

    ;; Parents.
    (let ((pl (cl--class-parents class))
          cur)
      (when pl
        (insert " Inherits from ")
        (while (setq cur (pop pl))
          (setq cur (cl--class-name cur))
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          (insert (substitute-command-keys "`"))
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          (help-insert-xref-button (symbol-name cur)
                                   'cl-help-type cur)
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          (insert (substitute-command-keys (if pl "', " "'"))))
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        (insert ".\n")))

    ;; Children, if available.  ¡For EIEIO!
    (let ((ch (condition-case nil
                  (cl-struct-slot-value metatype 'children class)
                (cl-struct-unknown-slot nil)))
          cur)
      (when ch
        (insert " Children ")
        (while (setq cur (pop ch))
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          (insert (substitute-command-keys "`"))
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          (help-insert-xref-button (symbol-name cur)
                                   'cl-help-type cur)
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          (insert (substitute-command-keys (if ch "', " "'"))))
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        (insert ".\n")))

    ;; Type's documentation.
    (let ((doc (cl--class-docstring class)))
      (when doc
        (insert "\n" doc "\n\n")))

    ;; Describe all the slots in this class.
    (cl--describe-class-slots class)

    ;; Describe all the methods specific to this class.
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    (let ((generics (cl-generic-all-functions type)))
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      (when generics
        (insert (propertize "Specialized Methods:\n\n" 'face 'bold))
        (dolist (generic generics)
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          (insert (substitute-command-keys "`"))
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          (help-insert-xref-button (symbol-name generic)
                                   'help-function generic)
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          (insert (substitute-command-keys "'"))
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          (pcase-dolist (`(,qualifiers ,args ,doc)
                         (cl--generic-method-documentation generic type))
            (insert (format " %s%S\n" qualifiers args)
                    (or doc "")))
          (insert "\n\n"))))))

(defun cl--describe-class-slot (slot)
  (insert
   (concat
    (propertize "Slot: " 'face 'bold)
    (prin1-to-string (cl--slot-descriptor-name slot))
    (unless (eq (cl--slot-descriptor-type slot) t)
      (concat "    type = "
              (prin1-to-string (cl--slot-descriptor-type slot))))
    ;; FIXME: The default init form is treated differently for structs and for
    ;; eieio objects: for structs, the default is nil, for eieio-objects
    ;; it's a special "unbound" value.
    (unless nil ;; (eq (cl--slot-descriptor-initform slot) eieio-unbound)
      (concat "    default = "
              (prin1-to-string (cl--slot-descriptor-initform