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- ;;; thing.el --- find language-specific contiguous pieces of text
-
- ;; Keywords: extensions, languages
-
- ;;; Authors: David Hughes <djh@cis.prime.com>
- ;;; adapted from Martin Boyer's thing.el for imouse
- ;;; Martin Boyer, IREQ <mboyer@ireq-robot.hydro.qc.ca>
- ;;; adapted from Heinz Schmidt's thing.el for sky-mouse
- ;;; Heinz Schmidt, ICSI (hws@ICSI.Berkeley.EDU)
- ;;; adapted from Dan L. Pierson's epoch-thing.el
- ;;; Dan L. Pierson <pierson@encore.com>, 2/5/90
- ;;; adapted from Joshua Guttman's Thing.el
- ;;; Joshua Guttman, MITRE (guttman@mitre.org)
- ;;; adapted from sun-fns.el by Joshua Guttman, MITRE.
- ;;;
- ;;; Copyright (C) International Computer Science Institute, 1991
- ;;;
-
- ;; 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 2, 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; see the file COPYING. If not, write to the Free
- ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- ;; 02111-1307, USA.
-
- ;;; Synched up with: Not in FSF.
- ;;; #### FSF has thingatpt.el, which does the same thing. Should merge
- ;;; or toss this.
-
- ;;;*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- ;;;* FUNCTION: Things are language objects contiguous pieces of text
- ;;;* whose boundaries can be defined by syntax or context.
- ;;;*
- ;;;* RELATED PACKAGES: various packages built on this.
- ;;;*
- ;;;* HISTORY:
- ;;;* Last edited: David Hughes 21st December 1992
- ;;;* jul 21 21:00 1993 (tlp00): added a kludgy thing-filename
- ;;;* Feb 22 21:00 1993 (tlp00): better merge with lucid and imouse
- ;;;* Dec 21 11:11 1992 (djh): added thing-report-char-p
- ;;;* Nov 23 18:00 1992 (djh): merged in Guido Bosch's ideas
- ;;;* Sep 10 15:35 1992 (djh): adapted for Lucid emacs19-mouse.el
- ;;;* Nov 28 17:40 1991 (mb): Cleaned up, and added thing-bigger-alist.
- ;;;* May 24 00:33 1991 (hws): overworked and added syntax.
- ;;;* Created: 2/5/90 Dan L. Pierson
- ;;;*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
- (provide 'thing)
-
- ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
- ;;;;;;;;;;;; Customization and Entry Point ;;;;;;;;;;;;;;;;;;;;;;;;;
- ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-
- (defvar thing-boundary-alist
- '((?w thing-word)
- (?_ thing-symbol)
- (?\( thing-sexp-start)
- (?\$ thing-sexp-start)
- (?' thing-sexp-start)
- (?\" thing-sexp-start)
- (?\) thing-sexp-end)
- (? thing-whitespace)
- (?< thing-comment)
- (?. thing-next-sexp))
- "*List of pairs of the form (SYNTAX-CHAR FUNCTION) used by
- the function `thing-boundaries'.")
-
- (defvar thing-report-char-p t
- "*Non nil means return single char boundaries if all else fails")
-
- (defvar thing-report-whitespace t
- "*Non nil means that whitespaces are considered as things, otherwise not.")
-
- (defvar *last-thing*
- "The last thing found by thing-boundaries. Used for chaining commands.")
-
- ;; The variable and function `thing-region' are to avoid the continual
- ;; construction of cons cells as result af the thing scanner functions.
- ;; This avoids unnecessary garbage collection. Guido Bosch <bosch@loria.fr>
-
- (defvar thing-region (cons 'nil 'nil)
- "Cons cell that contains a region (<beginning> . <end>)
- The function `thing-region' updates and returns it.")
-
- (defun thing-region (beginning end)
- "Make BEGINNING the car and END the cdr of the cons cell in the
- variable `thing-region'. Return the updated cons cell"
- (cond ((/= beginning end)
- (setcar thing-region beginning)
- (setcdr thing-region end)
- thing-region)))
-
- (defvar thing-bigger-alist
- '((word-symbol thing-symbol)
- (symbol thing-sexp)
- (word-sexp thing-sexp)
- (sexp thing-up-sexp)
- (sexp-up thing-up-sexp)
- (line thing-paragraph)
- (paragraph thing-page)
- (char thing-word)
- (word-sentence thing-sentence)
- (sentence thing-paragraph))
- "List of pairs to go from one thing to a bigger thing.
- See mouse-select-bigger-thing and mouse-delete-bigger-thing.")
-
- (defvar thing-word-next nil
- "*The next bigger thing after a word. A symbol.
- Supported values are: word-symbol, word-sexp, and word-sentence.
- Default value is word-sentence.
- Automatically becomes local when set in any fashion.")
- (make-variable-buffer-local 'thing-word-next)
-
- (defun thing-boundaries (here)
- "Return start and end of text object at HERE using syntax table and
- thing-boundary-alist. Thing-boundary-alist is a list of pairs of the
- form (SYNTAX-CHAR FUNCTION) where FUNCTION takes a single position
- argument and returns a cons of places (start end) representing
- boundaries of the thing at that position.
-
- Typically:
- Left or right Paren syntax indicates an s-expression.
- The end of a line marks the line including a trailing newline.
- Word syntax indicates current word.
- Symbol syntax indicates symbol.
- If it doesn't recognize one of these it selects just the character HERE.
-
- If an error occurs during syntax scanning, the function just prints a
- message and returns `nil'."
- (interactive "d")
- (setq *last-thing* nil)
- (if (save-excursion (goto-char here) (eolp))
- (thing-get-line here)
- (let* ((syntax (char-syntax (char-after here)))
- (pair (assq syntax thing-boundary-alist)))
- (cond ((and pair
- (or thing-report-whitespace
- (not (eq (car (cdr pair)) 'thing-whitespace))))
- (funcall (car (cdr pair)) here))
- (thing-report-char-p
- (setq *last-thing* 'char)
- (thing-region here (1+ here)))
- (t
- nil)))))
-
-
-
-
- ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
- ;;;;;;;;;;;;;;;;; Code Delimiters ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
- ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-
- (defun thing-symbol (here)
- "Return start and end of symbol at HERE."
- (cond ((memq (char-syntax (char-after here)) '(?_ ?w))
- (setq *last-thing* 'symbol)
- (let ((end (scan-sexps here 1)))
- (if end
- (thing-region (min here (scan-sexps end -1)) end))))))
-
- (defun thing-filename (here)
- "Return start and end of filename at HERE."
- (cond ((and (memq (char-syntax (char-after here)) '(?w ?_ ?.))
- (< here (point-max)))
- (let (start end)
- (save-excursion
- (goto-char here)
- (and (re-search-forward "\\s \\|:\\s\"\\|$" nil t)
- (goto-char (setq end (match-beginning 0)))
- (or
- (and
- (re-search-backward "[^_a-zA-Z0-9---#$.~/@]+" nil t)
- (setq start (+ (match-beginning 0)
- (if (bolp)
- 0
- 1))))
- (setq start (point-min)))
- (thing-region (min start here) (max here end))))))))
- ;~/
- (defun thing-sexp-start (here)
- "Return start and end of sexp starting HERE."
- (setq *last-thing* 'sexp-start)
- (thing-region here (scan-sexps here 1)))
-
- (defun thing-sexp-end (here)
- "Return start and end of sexp ending HERE."
- (setq *last-thing* 'sexp-end)
- (thing-region (scan-sexps (1+ here) -1) (1+ here)))
-
- (defun thing-sexp (here)
- "Return start and end of the sexp at HERE."
- (setq *last-thing* 'sexp)
- (save-excursion
- (goto-char here)
- (thing-region (progn (backward-up-list 1) (point))
- (progn (forward-list 1) (point)))))
-
- (defun thing-up-sexp (here)
- "Return start and end of the sexp enclosing the selected area."
- (setq *last-thing* 'sexp-up)
- ;; Keep going up and backward in sexps. This means that thing-up-sexp
- ;; can only be called after thing-sexp or after itself.
- (save-excursion
- (goto-char here)
- (thing-region (progn
- (condition-case ()
- (backward-up-list 1) (error nil))
- (point))
- (progn
- (condition-case ()
- (forward-list 1) (error nil))
- (point)))))
-
- ;;; Allow punctuation marks not followed by white-space to include
- ;;; the subsequent sexp. Useful in foo.bar(x).baz and such.
- (defun thing-next-sexp (here)
- "Return from HERE to the end of the sexp at HERE,
- if the character at HERE is part of a sexp."
- (setq *last-thing* 'sexp-next)
- (if (= (char-syntax (char-after (1+ here))) ? )
- (thing-region here (1+ here))
- (thing-region here
- (save-excursion (goto-char here) (forward-sexp) (point)))))
-
- ;;; Allow click to comment-char to extend to end of line
- (defun thing-comment (here)
- "Return rest of line from HERE to newline."
- (setq *last-thing* 'comment)
- (save-excursion (goto-char here)
- (while (= (char-syntax (preceding-char)) ?<)
- (forward-char -1))
- (thing-region (point) (progn (end-of-line) (point)))))
-
-
- ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
- ;;;;;;;;;;;;;;;;; Text Delimiters ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
- ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-
- (defun thing-word (here)
- "Return start and end of word at HERE."
- (setq *last-thing*
- (if thing-word-next
- thing-word-next
- (setq thing-word-next
- (cond
- ((memq major-mode '(emacs-lisp-mode c-mode c++-mode
- fortran-mode latex-mode lisp-mode
- perl-mode tex-mode))
- 'word-symbol)
- (t 'word-sentence)))))
- (save-excursion
- (goto-char here)
- (forward-word 1)
- (let ((end (point)))
- (forward-word -1)
- (thing-region (point) end))))
-
- (defun thing-sentence (here)
- "Return start and end of the sentence at HERE."
- (setq *last-thing* 'sentence)
- (save-excursion
- (goto-char here)
- (thing-region (progn (backward-sentence) (point))
- (progn (forward-sentence) (point)))))
-
- (defun thing-whitespace (here)
- "Return start to end of all of whitespace HERE."
- (setq *last-thing* 'whitespace)
- (save-excursion
- (goto-char here)
- (let ((start (progn (skip-chars-backward " \t") (1+ (point))))
- (end (progn (skip-chars-forward " \t") (point))))
- (if (= start end)
- (thing-region (1- start) end)
- (thing-region start end)))))
-
-
- ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
- ;;;;;;;;;;;;;;; Physical Delimiters ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
- ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-
- (defun thing-get-line (here)
- "Return whole of line HERE is in, with newline unless at eob."
- (setq *last-thing* 'line)
- (save-excursion
- (goto-char here)
- (let* ((start (progn (beginning-of-line 1) (point))))
- (thing-region start (point)))))
-
- (defun thing-paragraph (here)
- "Return start and end of the paragraph at HERE."
- (setq *last-thing* 'paragraph)
- (save-excursion
- (goto-char here)
- (thing-region (progn (backward-paragraph) (point))
- (progn (forward-paragraph) (point)))))
-
- (defun thing-page (here)
- "Return start and end of the page at HERE."
- (setq *last-thing* 'page)
- (save-excursion
- (goto-char here)
- (thing-region (progn (backward-page) (point))
- (progn (forward-page) (point)))))
-
-
- ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
- ;;;;;;;;;;;;;;;; Support functions ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
- ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-
- (defun kill-thing-at-point (here)
- "Kill text object using syntax table.
- See thing-boundaries for definition of text objects"
- (interactive "d")
- (let ((bounds (thing-boundaries here)))
- (kill-region (car bounds) (cdr bounds))))
-
- (defun copy-thing-at-point (here)
- "Copy text object using syntax table.
- See thing-boundaries for definition of text objects"
- (interactive "d")
- (let ((bounds (thing-boundaries here)))
- (copy-region-as-kill (car bounds) (cdr bounds))))
-