Reduce regexp usage, now CL-oriented non-regexp code available, core Lisp lisp/ChangeLog addition: 2015-04-01 Aidan Kehoe <kehoea@parhasard.net> When calling #'string-match with a REGEXP without regular expression special characters, call #'search, #'mismatch, #'find, etc. instead, making our code less likely to side-effect other functions' match data and a little faster. * apropos.el (apropos-command): * apropos.el (apropos): Call (position ?\n ...) rather than (string-match "\n" ...) here. * buff-menu.el: * buff-menu.el (buffers-menu-omit-invisible-buffers): Don't fire up the regexp engine just to check if a string starts with a space. * buff-menu.el (select-buffers-tab-buffers-by-mode): Don't fire up the regexp engine just to compare mode basenames. * buff-menu.el (format-buffers-tab-line): * buff-menu.el (build-buffers-tab-internal): Moved to being a label within the following. * buff-menu.el (buffers-tab-items): Use the label. * bytecomp.el (byte-compile-log-1): Don't fire up the regexp engine just to look for a newline. * cus-edit.el (get): Ditto. * cus-edit.el (custom-variable-value-create): Ditto, but for a colon. * descr-text.el (describe-text-sexp): Ditto. * descr-text.el (describe-char-unicode-data): Use #'split-string-by-char given that we're just looking for a semicolon. * descr-text.el (describe-char): Don't fire up the regexp engine just to look for a newline. * disass.el (disassemble-internal): Ditto. * files.el (file-name-sans-extension): Implement this using #'position. * files.el (file-name-extension): Correct this function's docstring, implement it in terms of #'position. * files.el (insert-directory): Don't fire up the regexp engine to split a string by space; don't reverse the list of switches, this is actually a longstand bug as far as I can see. * gnuserv.el (gnuserv-process-filter): Use #'position here, instead of consing inside #'split-string needlessly. * gtk-file-dialog.el (gtk-file-dialog-update-dropdown): Use #'split-string-by-char here, don't fire up #'split-string for directory-sep-char. * gtk-font-menu.el (hack-font-truename): Implement this more cheaply in terms of #'find, #'split-string-by-char, #'equal, rather than #'string-match, #'split-string, #'string-equal. * hyper-apropos.el (hyper-apropos-grok-functions): * hyper-apropos.el (hyper-apropos-grok-variables): Look for a newline using #'position rather than #'string-match in these functions. * info.el (Info-insert-dir): * info.el (Info-insert-file-contents): * info.el (Info-follow-reference): * info.el (Info-extract-menu-node-name): * info.el (Info-menu): Look for fixed strings using #'position or #'search as appropriate in this file. * ldap.el (ldap-decode-string): * ldap.el (ldap-encode-string): #'encode-coding-string, #'decode-coding-string are always available, don't check if they're fboundp. * ldap.el (ldap-decode-address): * ldap.el (ldap-encode-address): Use #'split-string-by-char in these functions. * lisp-mnt.el (lm-creation-date): * lisp-mnt.el (lm-last-modified-date): Don't fire up the regexp engine just to look for spaces in this file. * menubar-items.el (default-menubar): Use (not (mismatch ...)) rather than #'string-match here, for simple regexp. Use (search "beta" ...) rather than (string-match "beta" ...) * menubar-items.el (sort-buffers-menu-alphabetically): * menubar-items.el (sort-buffers-menu-by-mode-then-alphabetically): * menubar-items.el (group-buffers-menu-by-mode-then-alphabetically): Don't fire up the regexp engine to check if a string starts with a space or an asterisk. Use the more fine-grained results of #'compare-strings; compare case-insensitively for the buffer menu. * menubar-items.el (list-all-buffers): * menubar-items.el (tutorials-menu-filter): Use #'equal rather than #'string-equal, which, in this context, has the drawback of not having a bytecode, and no redeeming features. * minibuf.el: * minibuf.el (un-substitute-in-file-name): Use #'count, rather than counting the occurences of $ using the regexp engine. * minibuf.el (read-file-name-internal-1): Don't fire up the regexp engine to search for ?=. * mouse.el (mouse-eval-sexp): Check for newline with #'find. * msw-font-menu.el (mswindows-reset-device-font-menus): Split a string by newline with #'split-string-by-char. * mule/japanese.el: * mule/japanese.el ("Japanese"): Use #'search rather than #'string-match; canoncase before comparing; fix a bug I had introduced where I had been making case insensitive comparisons where the case mattered. * mule/korea-util.el (default-korean-keyboard): Look for ?3 using #'find, not #'string-march. * mule/korea-util.el (quail-hangul-switch-hanja): Search for a fixed string using #'search. * mule/mule-cmds.el (set-locale-for-language-environment): #'position, #'substitute rather than #'string-match, #'replace-in-string. * newcomment.el (comment-make-extra-lines): Use #'search rather than #'string-match for a simple string. * package-get.el (package-get-remote-filename): Use #'position when looking for ?@ * process.el (setenv): * process.el (read-envvar-name): Use #'position when looking for ?=. * replace.el (map-query-replace-regexp): Use #'split-string-by-char instead of using an inline implementation of it. * select.el (select-convert-from-cf-text): * select.el (select-convert-from-cf-unicodetext): Use #'position rather than #'string-match in these functions. * setup-paths.el (paths-emacs-data-root-p): Use #'search when looking for simple string. * sound.el (load-sound-file): Use #'split-string-by-char rather than an inline reimplementation of same. * startup.el (splash-screen-window-body): * startup.el (splash-screen-tty-body): Search for simple strings using #'search. * version.el (emacs-version): Ditto. * x-font-menu.el (hack-font-truename): Implement this more cheaply in terms of #'find, #'split-string-by-char, #'equal, rather than #'string-match, #'split-string, #'string-equal. * x-font-menu.el (x-reset-device-font-menus-core): Use #'split-string-by-char here. * x-init.el (x-initialize-keyboard): Search for a simple string using #'search.

;;; page.el --- page motion commands for Emacs

;; Copyright (C) 1985, 1997 Free Software Foundation, Inc.

;; Maintainer: FSF
;; Keywords: extensions, dumped
;; Keywords: wp convenience

;; This file is part of XEmacs.

;; XEmacs 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 3 of the License, or (at your
;; option) any later version.

;; XEmacs 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 XEmacs.  If not, see <http://www.gnu.org/licenses/>.

;;; Synched up with: FSF 21.3.

;;; Commentary:

;; This file is dumped with XEmacs.

;; This code provides the page-oriented movement and selection commands
;; documented in the XEmacs Reference Manual.

;;; Code:

(defun forward-page (&optional count)
  "Move forward to page boundary.  With arg, repeat, or go back if negative.
A page boundary is any line whose beginning matches the regexp
`page-delimiter'."
  (interactive "_p") ; XEmacs
  (or count (setq count 1))
  (while (and (> count 0) (not (eobp)))
    ;; In case the page-delimiter matches the null string,
    ;; don't find a match without moving.
    (if (bolp) (forward-char 1))
    (if (re-search-forward page-delimiter nil t)
	nil
      (goto-char (point-max)))
    (setq count (1- count)))
  (while (and (< count 0) (not (bobp)))
    ;; In case the page-delimiter matches the null string,
    ;; don't find a match without moving.
    (and (save-excursion (re-search-backward page-delimiter nil t))
	 (= (match-end 0) (point))
	 (goto-char (match-beginning 0)))
    (backward-char 1)
    (if (re-search-backward page-delimiter nil t)
	;; We found one--move to the end of it.
	(goto-char (match-end 0))
      ;; We found nothing--go to beg of buffer.
      (goto-char (point-min)))
    (setq count (1+ count))))

(defun backward-page (&optional count)
  "Move backward to page boundary.  With arg, repeat, or go fwd if negative.
A page boundary is any line whose beginning matches the regexp
`page-delimiter'."
  (interactive "_p") ; XEmacs
  (or count (setq count 1))
  (forward-page (- count)))

(defun mark-page (&optional arg)
  "Put mark at end of page, point at beginning.
A numeric arg specifies to move forward or backward by that many pages,
thus marking a page other than the one point was originally in."
  (interactive "P")
  (setq arg (if arg (prefix-numeric-value arg) 0))
  (if (> arg 0)
      (forward-page arg)
    (if (< arg 0)
        (forward-page (1- arg))))
  (forward-page)
  (push-mark nil t t)
  (forward-page -1))

(defun narrow-to-page (&optional arg)
  "Make text outside current page invisible.
A numeric arg specifies to move forward or backward by that many pages,
thus showing a page other than the one point was originally in."
  (interactive "P")
  (setq arg (if arg (prefix-numeric-value arg) 0))
  (save-excursion
    (widen)
    (if (> arg 0)
	(forward-page arg)
      (if (< arg 0)
	  (let ((adjust 0)
		(opoint (point)))
	    ;; If we are not now at the beginning of a page,
	    ;; move back one extra time, to get to the start of this page.
	    (save-excursion
	      (beginning-of-line)
	      (or (and (looking-at page-delimiter)
		       (eq (match-end 0) opoint))
		  (setq adjust 1)))
	    (forward-page (- arg adjust)))))
    ;; Find the end of the page.
    (set-match-data nil)
    (forward-page)
    ;; If we stopped due to end of buffer, stay there.
    ;; If we stopped after a page delimiter, put end of restriction
    ;; at the beginning of that line.
    ;; Before checking the match that was found,
    ;; verify that forward-page actually set the match data.
    (if (and (match-beginning 0)
	     (save-excursion
	       (goto-char (match-beginning 0)) ; was (beginning-of-line)
	       (looking-at page-delimiter)))
	(beginning-of-line))
    (narrow-to-region (point)
		      (progn
			;; Find the top of the page.
			(forward-page -1)
			;; If we found beginning of buffer, stay there.
			;; If extra text follows page delimiter on same line,
			;; include it.
			;; Otherwise, show text starting with following line.
			(if (and (eolp) (not (bobp)))
			    (forward-line 1))
			(point)))))
(put 'narrow-to-page 'disabled t)

(defun count-lines-page ()
  "Report number of lines on current page, and how many are before or after point."
  (interactive "_") ; XEmacs
  (save-excursion
    (let ((opoint (point)) beg end
	  total before after)
      (forward-page)
      (beginning-of-line)
      (or (looking-at page-delimiter)
	  (end-of-line))
      (setq end (point))
      (backward-page)
      (setq beg (point))
      (setq total (count-lines beg end)
	    before (count-lines beg opoint)
	    after (count-lines opoint end))
      (message "Page has %d lines (%d + %d)" total before after))))

(defun what-page ()
  "Print page and line number of point."
  (interactive "_") ; XEmacs
  (save-restriction
    (widen)
    (save-excursion
      (beginning-of-line)
      (let ((count 1)
	    (opoint (point)))
	(goto-char 1)
	(while (re-search-forward page-delimiter opoint t)
	  (setq count (1+ count)))
	(message "Page %d, line %d"
		 count
		 (1+ (count-lines (point) opoint)))))))

;;; Place `provide' at end of file.
(provide 'page)

;;; page.el ends here