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Initial revision
This commit is contained in:
Richard M. Stallman
parent
8ff9d1b06d
commit
698e1804b8
394
lisp/replace.el
Normal file
394
lisp/replace.el
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@ -0,0 +1,394 @@
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;; Replace commands for Emacs.
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;; Copyright (C) 1985, 1986 Free Software Foundation, Inc.
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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 1, 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
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;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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(fset 'delete-non-matching-lines 'keep-lines)
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(defun keep-lines (regexp)
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"Delete all lines except those containing matches for REGEXP.
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A match split across lines preserves all the lines it lies in.
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Applies to all lines after point."
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(interactive "sKeep lines (containing match for regexp): ")
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(save-excursion
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(or (bolp) (forward-line 1))
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(let ((start (point)))
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(while (not (eobp))
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;; Start is first char not preserved by previous match.
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(if (not (re-search-forward regexp nil 'move))
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(delete-region start (point-max))
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(let ((end (save-excursion (goto-char (match-beginning 0))
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(beginning-of-line)
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(point))))
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;; Now end is first char preserved by the new match.
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(if (< start end)
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(delete-region start end))))
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(setq start (save-excursion (forward-line 1)
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(point)))
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;; If the match was empty, avoid matching again at same place.
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(and (not (eobp)) (= (match-beginning 0) (match-end 0))
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(forward-char 1))))))
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(fset 'delete-matching-lines 'flush-lines)
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(defun flush-lines (regexp)
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"Delete lines containing matches for REGEXP.
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If a match is split across lines, all the lines it lies in are deleted.
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Applies to lines after point."
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(interactive "sFlush lines (containing match for regexp): ")
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(save-excursion
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(while (and (not (eobp))
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(re-search-forward regexp nil t))
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(delete-region (save-excursion (goto-char (match-beginning 0))
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(beginning-of-line)
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(point))
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(progn (forward-line 1) (point))))))
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(fset 'count-matches 'how-many)
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(defun how-many (regexp)
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"Print number of matches for REGEXP following point."
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(interactive "sHow many matches for (regexp): ")
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(let ((count 0) opoint)
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(save-excursion
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(while (and (not (eobp))
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(progn (setq opoint (point))
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(re-search-forward regexp nil t)))
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(if (= opoint (point))
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(forward-char 1)
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(setq count (1+ count))))
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(message "%d occurrences" count))))
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(defvar occur-mode-map ())
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(if occur-mode-map
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()
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(setq occur-mode-map (make-sparse-keymap))
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(define-key occur-mode-map "\C-c\C-c" 'occur-mode-goto-occurrence))
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(defvar occur-buffer nil)
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(defvar occur-nlines nil)
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(defvar occur-pos-list nil)
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(defun occur-mode ()
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"Major mode for output from \\[occur].
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Move point to one of the occurrences in this buffer,
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then use \\[occur-mode-goto-occurrence] to go to the same occurrence
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in the buffer that the occurrences were found in.
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\\{occur-mode-map}"
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(kill-all-local-variables)
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(use-local-map occur-mode-map)
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(setq major-mode 'occur-mode)
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(setq mode-name "Occur")
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(make-local-variable 'occur-buffer)
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(make-local-variable 'occur-nlines)
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(make-local-variable 'occur-pos-list))
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(defun occur-mode-goto-occurrence ()
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"Go to the line this occurrence was found in, in the buffer it was found in."
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(interactive)
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(if (or (null occur-buffer)
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(null (buffer-name occur-buffer)))
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(progn
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(setq occur-buffer nil
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occur-pos-list nil)
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(error "Buffer in which occurrences were found is deleted")))
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(let* ((occur-number (save-excursion
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(beginning-of-line)
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(/ (1- (count-lines (point-min)
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(save-excursion
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(beginning-of-line)
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(point))))
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(cond ((< occur-nlines 0)
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(- 2 occur-nlines))
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((> occur-nlines 0)
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(+ 2 (* 2 occur-nlines)))
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(t 1)))))
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(pos (nth occur-number occur-pos-list)))
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(pop-to-buffer occur-buffer)
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(goto-char (marker-position pos))))
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(defvar list-matching-lines-default-context-lines 0
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"*Default number of context lines to include around a list-matching-lines
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match. A negative number means to include that many lines before the match.
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A positive number means to include that many lines both before and after.")
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(defvar occur-whole-buffer nil
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"If t, occur operates on whole buffer, otherwise occur starts from point.
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default is nil.")
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(fset 'list-matching-lines 'occur)
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(defun occur (regexp &optional nlines)
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"Show lines containing a match for REGEXP. If the global variable
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occur-whole-buffer is non-nil, the entire buffer is searched, otherwise
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search begins at point.
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Each line is displayed with NLINES lines before and after,
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or -NLINES before if NLINES is negative.
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NLINES defaults to list-matching-lines-default-context-lines.
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Interactively it is the prefix arg.
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The lines are shown in a buffer named *Occur*.
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It serves as a menu to find any of the occurrences in this buffer.
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\\[describe-mode] in that buffer will explain how."
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(interactive "sList lines matching regexp: \nP")
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(setq nlines (if nlines (prefix-numeric-value nlines)
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list-matching-lines-default-context-lines))
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(let ((first t)
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(buffer (current-buffer))
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(linenum 1)
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(prevpos (point-min)))
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(if (not occur-whole-buffer)
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(save-excursion
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(beginning-of-line)
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(setq linenum (1+ (count-lines (point-min) (point))))
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(setq prevpos (point))))
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(with-output-to-temp-buffer "*Occur*"
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(save-excursion
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(set-buffer standard-output)
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(insert "Lines matching ")
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(prin1 regexp)
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(insert " in buffer " (buffer-name buffer) ?. ?\n)
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(occur-mode)
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(setq occur-buffer buffer)
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(setq occur-nlines nlines)
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(setq occur-pos-list ()))
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(if (eq buffer standard-output)
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(goto-char (point-max)))
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(save-excursion
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(if occur-whole-buffer
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(beginning-of-buffer))
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;; Find next match, but give up if prev match was at end of buffer.
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(while (and (not (= prevpos (point-max)))
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(re-search-forward regexp nil t))
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(beginning-of-line)
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(setq linenum (+ linenum (count-lines prevpos (point))))
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(setq prevpos (point))
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(let* ((start (save-excursion
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(forward-line (if (< nlines 0) nlines (- nlines)))
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(point)))
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(end (save-excursion
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(if (> nlines 0)
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(forward-line (1+ nlines))
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(forward-line 1))
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(point)))
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(tag (format "%3d" linenum))
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(empty (make-string (length tag) ?\ ))
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tem)
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(save-excursion
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(setq tem (make-marker))
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(set-marker tem (point))
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(set-buffer standard-output)
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(setq occur-pos-list (cons tem occur-pos-list))
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(or first (zerop nlines)
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(insert "--------\n"))
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(setq first nil)
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(insert-buffer-substring buffer start end)
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(backward-char (- end start))
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(setq tem (if (< nlines 0) (- nlines) nlines))
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(while (> tem 0)
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(insert empty ?:)
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(forward-line 1)
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(setq tem (1- tem)))
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(insert tag ?:)
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(forward-line 1)
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(while (< tem nlines)
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(insert empty ?:)
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(forward-line 1)
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(setq tem (1+ tem))))
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(forward-line 1)))
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(set-buffer standard-output)
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;; Put positions in increasing order to go with buffer.
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(setq occur-pos-list (nreverse occur-pos-list))
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(if (interactive-p)
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(message "%d matching lines." (length occur-pos-list)))))))
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(defconst query-replace-help
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"Type Space or `y' to replace one match, Delete or `n' to skip to next,
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ESC or `q' to exit, Period to replace one match and exit,
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Comma to replace but not move point immediately,
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C-r to enter recursive edit (\\[exit-recursive-edit] to get out again),
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C-w to delete match and recursive edit,
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C-l to clear the screen, redisplay, and offer same replacement again,
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! to replace all remaining matches with no more questions,
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^ to move point back to previous match."
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"Help message while in query-replace")
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(defun perform-replace (from-string replacements
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query-flag regexp-flag delimited-flag
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&optional repeat-count)
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"Subroutine of `query-replace'. Its complexity handles interactive queries.
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Don't use this in your own program unless you want to query and set the mark
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just as `query-replace' does. Instead, write a simple loop like this:
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(while (re-search-forward \"foo[ \t]+bar\" nil t)
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(replace-match \"foobar\" nil nil))
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which will run faster and do exactly what you probably want."
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(let ((nocasify (not (and case-fold-search case-replace
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(string-equal from-string
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(downcase from-string)))))
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(literal (not regexp-flag))
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(search-function (if regexp-flag 're-search-forward 'search-forward))
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(search-string from-string)
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(next-replacement nil)
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(replacement-index 0)
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(keep-going t)
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(stack nil)
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(next-rotate-count 0)
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(replace-count 0)
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(lastrepl nil)) ;Position after last match considered.
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(if (stringp replacements)
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(setq next-replacement replacements)
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(or repeat-count (setq repeat-count 1)))
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(if delimited-flag
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(setq search-function 're-search-forward
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search-string (concat "\\b"
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(if regexp-flag from-string
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(regexp-quote from-string))
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"\\b")))
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(push-mark)
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(undo-boundary)
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(while (and keep-going
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(not (eobp))
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(funcall search-function search-string nil t)
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(if (eq lastrepl (point))
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(progn
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;; Don't replace the null string
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;; right after end of previous replacement.
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(forward-char 1)
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(funcall search-function search-string nil t))
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t))
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;; If time for a change, advance to next replacement string.
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(if (and (listp replacements)
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(= next-rotate-count replace-count))
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(progn
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(setq next-rotate-count
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(+ next-rotate-count repeat-count))
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(setq next-replacement (nth replacement-index replacements))
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(setq replacement-index (% (1+ replacement-index) (length replacements)))))
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(if (not query-flag)
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(progn
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(replace-match next-replacement nocasify literal)
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(setq replace-count (1+ replace-count)))
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(undo-boundary)
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(let (done replaced)
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(while (not done)
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;; Preserve the match data. Process filters and sentinels
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;; could run inside read-char..
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(let ((data (match-data))
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(help-form
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'(concat "Query replacing "
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(if regexp-flag "regexp " "")
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from-string " with " next-replacement ".\n\n"
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(substitute-command-keys query-replace-help))))
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(setq char help-char)
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(while (or (not (numberp char)) (= char help-char))
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(message "Query replacing %s with %s: " from-string next-replacement)
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(setq char (read-event))
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(if (and (numberp char) (= char ??))
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(setq unread-command-char help-char char help-char)))
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(store-match-data data))
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(cond ((or (= char ?\e)
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(= char ?q))
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(setq keep-going nil)
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(setq done t))
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((= char ?^)
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(let ((elt (car stack)))
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(goto-char (car elt))
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(setq replaced (eq t (cdr elt)))
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(or replaced
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(store-match-data (cdr elt)))
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(setq stack (cdr stack))))
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((or (= char ?\ )
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(= char ?y))
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(or replaced
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(replace-match next-replacement nocasify literal))
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(setq done t replaced t))
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((= char ?\.)
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(or replaced
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(replace-match next-replacement nocasify literal))
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(setq keep-going nil)
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(setq done t replaced t))
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((= char ?\,)
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(if (not replaced)
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(progn
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(replace-match next-replacement nocasify literal)
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(setq replaced t))))
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((= char ?!)
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(or replaced
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(replace-match next-replacement nocasify literal))
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(setq done t query-flag nil replaced t))
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((or (= char ?\177)
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(= char ?n))
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(setq done t))
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((= char ?\C-l)
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(recenter nil))
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((= char ?\C-r)
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(store-match-data
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(prog1 (match-data)
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(save-excursion (recursive-edit)))))
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((= char ?\C-w)
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(delete-region (match-beginning 0) (match-end 0))
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(store-match-data
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(prog1 (match-data)
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(save-excursion (recursive-edit))))
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(setq replaced t))
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(t
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(setq keep-going nil)
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(setq unread-command-char char)
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(setq done t))))
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;; Record previous position for ^ when we move on.
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;; Change markers to numbers in the match data
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;; since lots of markers slow down editing.
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(setq stack
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(cons (cons (point)
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(or replaced
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(mapcar
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(function (lambda (elt)
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(and elt
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(marker-position elt))))
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(match-data))))
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stack))
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(if replaced (setq replace-count (1+ replace-count)))))
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(setq lastrepl (point)))
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(and keep-going stack)))
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(defun map-query-replace-regexp (regexp to-strings &optional arg)
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"Replace some matches for REGEXP with various strings, in rotation.
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The second argument TO-STRINGS contains the replacement strings, separated
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by spaces. This command works like `query-replace-regexp' except
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that each successive replacement uses the next successive replacement string,
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wrapping around from the last such string to the first.
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Non-interactively, TO-STRINGS may be a list of replacement strings.
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A prefix argument N says to use each replacement string N times
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before rotating to the next."
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(interactive "sMap query replace (regexp): \nsQuery replace %s with (space-separated strings): \nP")
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(let (replacements)
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(if (listp to-strings)
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(setq replacements to-strings)
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(while (/= (length to-strings) 0)
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(if (string-match " " to-strings)
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(setq replacements
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(append replacements
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(list (substring to-strings 0
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(string-match " " to-strings))))
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to-strings (substring to-strings
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(1+ (string-match " " to-strings))))
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(setq replacements (append replacements (list to-strings))
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to-strings ""))))
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(perform-replace regexp replacements t t nil arg))
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(message "Done"))
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