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1 ;;;; psgml-charent.el
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2 ;;; Last edited: Mon Nov 28 22:18:09 1994 by lenst@lysistrate (Lennart Staflin)
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3 ;;; $Id: psgml-charent.el,v 1.2 1997/04/24 04:00:12 steve Exp $
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4
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5 ;; Copyright (C) 1994 Lennart Staflin
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6
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7 ;; Author: Steinar Bang, Falch Hurtigtrykk as., Oslo, 940711
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8 ;; Lennart Staflin <lenst@lysator.liu.se>
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9 ;;
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10 ;; This program is free software; you can redistribute it and/or
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11 ;; modify it under the terms of the GNU General Public License
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12 ;; as published by the Free Software Foundation; either version 2
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13 ;; of the License, or (at your option) any later version.
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14 ;;
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15 ;; This program is distributed in the hope that it will be useful,
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16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 ;; GNU 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 this program; if not, write to the Free Software
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22 ;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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23
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24
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25 ;;;; Commentary:
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26
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27 ;; Functions to convert character entities into displayable characters
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28 ;; and displayable characters back into character entities.
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29
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30
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31 ;;;; Code:
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32
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33 (provide 'psgml-charent)
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34 (require 'psgml-parse)
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35
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36
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37 ;;;; Variable declarations
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38
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39 (defvar sgml-display-char-list-filename
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40 (expand-file-name "sgml/iso88591.map" data-directory)
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41 "*Name of file holding relations between character codes and character
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42 names of displayable characters")
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43
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44 (defvar sgml-display-char-alist-cache nil)
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45
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46
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47 ;;;; Function declarations
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48
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49 (defun sgml-display-char-alist ()
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50 "Return the current display character alist.
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51 Alist with entity name as key and display character as content."
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52 (unless (file-exists-p sgml-display-char-list-filename)
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53 (error "No display char file: %s"
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54 sgml-display-char-list-filename))
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55 (sgml-cache-catalog sgml-display-char-list-filename
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56 'sgml-display-char-alist-cache
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57 (function sgml-read-display-char-alist)))
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58
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59 (defun sgml-read-display-char-alist ()
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60 (let (key disp-char alist)
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61 (while (re-search-forward "^\\([0-9]+\\)[ \t]+\\(.+\\)$" nil t)
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62 (setq key (buffer-substring (match-beginning 2) (match-end 2)))
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63 (setq disp-char
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64 (char-to-string
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65 (string-to-number
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66 (buffer-substring (match-beginning 1) (match-end 1)))))
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67 (push (cons key disp-char)
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68 alist))
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69 alist))
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70
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71 (defun sgml-charent-to-dispchar-alist ()
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72 "Association list to hold relations of the type
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73 (CHARACTER-NAME . CHARACTER)
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74 where
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75 CHARACTER-NAME is a string holding a character name
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76 CHARACTER is a string holding a single displayable character"
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77 (sgml-need-dtd)
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78 (let ((display-chars (sgml-display-char-alist))
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79 (alist nil))
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80 (sgml-map-entities
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81 (function
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82 (lambda (entity)
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83 (let ((char (cdr (assoc (sgml-entity-text entity)
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84 display-chars))))
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85 (when char
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86 (push (cons (sgml-entity-name entity) char) alist)))))
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87 (sgml-dtd-entities sgml-dtd-info))
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88
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89 alist))
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90
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91
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92 (defun sgml-charent-to-display-char ()
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93 "Replace character entities with their display character equivalents"
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94 (interactive)
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95 (let ((charent-to-char
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96 (sgml-charent-to-dispchar-alist))
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97 charent replacement)
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98 (save-excursion
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99 (goto-char (point-min))
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100 (sgml-with-parser-syntax
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101 (while (re-search-forward "&\\(\\w\\(\\w\\|\\s_\\)+\\);?" nil t)
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102 (setq charent (buffer-substring (match-beginning 1) (match-end 1)))
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103 (if (setq replacement (cdr (assoc charent charent-to-char)))
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104 (replace-match replacement t t)))))))
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105
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106 (defun sgml-display-char-to-charent ()
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107 "Replace displayable characters with their character entity equivalents"
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108 (interactive)
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109 (let ((case-fold-search nil))
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110 (save-excursion
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111 (loop for pair in (sgml-charent-to-dispchar-alist)
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112 do (goto-char (point-min))
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113 (while (search-forward (cdr pair) nil t)
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114 (replace-match (concat "&" (car pair) ";") t t))))))
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115
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116
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117
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118 ;;; psgml-charent.el ends here
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