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1 ;;; atomic-extents.el --- treat regions of text as a single object
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2
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3 ;; Copyright (C) 1993 Free Software Foundation, Inc.
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4 ;; Created: 21-Dec-93, Chuck Thompson <cthomp@cs.uiuc.edu>
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5 ;; Keywords: extensions
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6 ;; Changed: 08-Aug-94, Heiko Muenkel <muenkel@tnt.uni-hannover.de>
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7
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8 ;; This file is part of XEmacs.
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9
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10 ;; XEmacs is free software; you can redistribute it and/or modify it
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11 ;; under the terms of the GNU General Public License as published by
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12 ;; the Free Software Foundation; either version 2, or (at your option)
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13 ;; any later version.
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14
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15 ;; XEmacs is distributed in the hope that it will be useful, but
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16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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18 ;; General Public License for more details.
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19
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20 ;; You should have received a copy of the GNU General Public License
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21 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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22 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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23
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24 ;;; Point is not allowed to fall inside of an atomic extent. This has
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25 ;;; the effect of making all text covered by an atomic extent be
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26 ;;; treated as a single object. Normally point will be adjusted to an
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27 ;;; end of an atomic extent in the direction of motion. If point
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28 ;;; appears inside of an atomic extent (via goto-char for example),
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29 ;;; point will be adjusted to the side closest to the entry point.
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30
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31 ;;; Synched up with: Not in FSF.
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32
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33 ;;; To make an extent atomic use the command:
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34 ;;; (set-extent-property #<extent obj> 'atomic t)
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35
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36 ;;; Known bug: the atomic property is not detected when sweeping
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37 ;;; regions with the mouse until after the mouse button is released.
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38 ;;; The release point will then be treated as if it had been reached
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39 ;;; using 'goto-char.
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40
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41 ;;; atomic-extent-goto-char-p is defined in editfns.c
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42
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43 (provide 'atomic-extents)
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44
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45 (defvar atomic-extent-old-point nil
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46 "The value of point when pre-command-hook is called.
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47 Used to determine the direction of motion.")
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48
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49 (defun atomic-extent-pre-hook ()
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50 (setq atomic-extent-old-point (point))
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51 (setq atomic-extent-goto-char-p nil))
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52
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53 (defun atomic-extent-post-hook ()
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54 (let ((extent (extent-at (point) nil 'atomic)))
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55 (if extent
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56 (let ((begin (extent-start-position extent))
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57 (end (extent-end-position extent))
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58 (pos (point))
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59 (region-set (and (point) (mark))))
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60 (if (eq this-command
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61 'x-set-point-and-insert-selection)
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62 (delete-region (region-beginning) (region-end)))
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63 (if (/= pos begin)
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64 (if atomic-extent-goto-char-p
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65 (progn
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66 (if (> (- pos begin) (- end pos))
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67 (goto-char end)
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68 (goto-char begin)))
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69 (if (> pos atomic-extent-old-point)
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70 (goto-char end)
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71 (goto-char begin))))
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72 (if (and region-set (/= pos begin))
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73 (progn
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74 (run-hooks 'zmacs-update-region-hook)
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75 (x-store-cutbuffer (buffer-substring (region-beginning)
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76 (region-end)))
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77 )))))
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78 (if (mark)
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79 (progn
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80 (exchange-point-and-mark t)
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81 (let ((extent (extent-at (point) nil 'atomic)))
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82 (if extent
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83 (let ((begin (extent-start-position extent))
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84 (end (extent-end-position extent))
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85 (pos (point))
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86 (region-set (and (point) (mark))))
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87 (if (/= pos begin)
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88 (if atomic-extent-goto-char-p
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89 (progn
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90 (if (> (- pos begin) (- end pos))
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91 (goto-char end)
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92 (goto-char begin)))
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93 (if (> pos atomic-extent-old-point)
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94 (goto-char end)
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95 (goto-char begin))))
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96 (if (and region-set (/= pos begin))
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97 (progn
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98 (run-hooks 'zmacs-update-region-hook)
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99 (x-store-cutbuffer (buffer-substring (region-beginning)
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100 (region-end)))
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101 (message "%d, %d" (region-beginning) (region-end))
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102 )))))
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103 (exchange-point-and-mark t)))
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104 )
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105
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106 (add-hook 'pre-command-hook 'atomic-extent-pre-hook)
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107 (add-hook 'post-command-hook 'atomic-extent-post-hook)
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108
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109 ;;; atomic-extents.el ends here
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