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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 1.1.1.1 1996/12/18 03:35:18 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
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35
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36 ;;;; Variable declarations
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37
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38 (defvar sgml-display-char-list-filename
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39 (expand-file-name sgml-data-directory "iso88591.map")
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40 "*Name of file holding relations between character codes and character
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41 names of displayable characters")
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42
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43 (defvar sgml-display-char-alist-cache nil)
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44
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45
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46 ;;;; Function declarations
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47
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48 (defun sgml-display-char-alist ()
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49 "Return the current display character alist.
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50 Alist with entity name as key and display character as content."
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51 (unless (file-exists-p sgml-display-char-list-filename)
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52 (error "No display char file: %s"
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53 sgml-display-char-list-filename))
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54 (sgml-cache-catalog sgml-display-char-list-filename
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55 'sgml-display-char-alist-cache
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56 (function sgml-read-display-char-alist)))
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57
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58 (defun sgml-read-display-char-alist ()
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59 (let (key disp-char alist)
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60 (while (re-search-forward "^\\([0-9]+\\)[ \t]+\\(.+\\)$" nil t)
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61 (setq key (buffer-substring (match-beginning 2) (match-end 2)))
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62 (setq disp-char
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63 (char-to-string
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64 (string-to-number
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65 (buffer-substring (match-beginning 1) (match-end 1)))))
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66 (push (cons key disp-char)
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67 alist))
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68 alist))
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69
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70 (defun sgml-charent-to-dispchar-alist ()
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71 "Association list to hold relations of the type
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72 (CHARACTER-NAME . CHARACTER)
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73 where
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74 CHARACTER-NAME is a string holding a character name
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75 CHARACTER is a string holding a single displayable character"
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76 (sgml-need-dtd)
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77 (let ((display-chars (sgml-display-char-alist))
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78 (alist nil))
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79 (sgml-map-entities
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80 (function
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81 (lambda (entity)
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82 (let ((char (cdr (assoc (sgml-entity-text entity)
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83 display-chars))))
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84 (when char
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85 (push (cons (sgml-entity-name entity) char) alist)))))
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86 (sgml-dtd-entities sgml-dtd-info))
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87
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88 alist))
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89
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90
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91 (defun sgml-charent-to-display-char ()
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92 "Replace character entities with their display character equivalents"
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93 (interactive)
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94 (let ((charent-to-char
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95 (sgml-charent-to-dispchar-alist))
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96 charent replacement)
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97 (save-excursion
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98 (goto-char (point-min))
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99 (sgml-with-parser-syntax
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100 (while (re-search-forward "&\\(\\w\\(\\w\\|\\s_\\)+\\);?" nil t)
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101 (setq charent (buffer-substring (match-beginning 1) (match-end 1)))
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102 (if (setq replacement (cdr (assoc charent charent-to-char)))
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103 (replace-match replacement t t)))))))
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104
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105 (defun sgml-display-char-to-charent ()
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106 "Replace displayable characters with their character entity equivalents"
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107 (interactive)
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108 (let ((case-fold-search nil))
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109 (save-excursion
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110 (loop for pair in (sgml-charent-to-dispchar-alist)
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111 do (goto-char (point-min))
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112 (while (search-forward (cdr pair) nil t)
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113 (replace-match (concat "&" (car pair) ";") t t))))))
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114
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115
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116
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117
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118 (require 'psgml-parse)
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119
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120 ;;; psgml-charent.el ends here
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