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1 ;;; richtext.el -- read and save files in text/richtext format
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3 ;; Copyright (C) 1995,1996,1997 Free Software Foundation, Inc.
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5 ;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
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6 ;; Created: 1995/7/15
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7 ;; Version: $Id: richtext.el,v 1.2 1997/02/15 22:21:25 steve Exp $
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8 ;; Keywords: wp, faces, MIME, multimedia
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9
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10 ;; This file is not part of GNU Emacs yet.
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11
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12 ;; This program is free software; you can redistribute it and/or
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13 ;; modify it under the terms of the GNU General Public License as
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14 ;; published by the Free Software Foundation; either version 2, or (at
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15 ;; your option) any later version.
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16
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17 ;; This program is distributed in the hope that it will be useful, but
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18 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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20 ;; General Public License for more details.
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21
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22 ;; You should have received a copy of the GNU General Public License
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23 ;; along with GNU Emacs; see the file COPYING. If not, write to the
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24 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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25 ;; Boston, MA 02111-1307, USA.
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26
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27 ;;; Code:
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4
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28
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29 (require 'enriched)
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30
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31
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32 ;;; @ variables
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33 ;;;
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34
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35 (defconst richtext-initial-annotation
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36 (lambda ()
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37 (format "Content-Type: text/richtext\nText-Width: %d\n\n"
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38 (enriched-text-width)))
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39 "What to insert at the start of a text/richtext file.
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40 If this is a string, it is inserted. If it is a list, it should be a lambda
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41 expression, which is evaluated to get the string to insert.")
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42
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43 (defconst richtext-annotation-regexp
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44 "[ \t\n]*\\(<\\(/\\)?\\([-A-za-z0-9]+\\)>\\)[ \t\n]*"
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45 "Regular expression matching richtext annotations.")
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46
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47 (defconst richtext-translations
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48 '((face (bold-italic "bold" "italic")
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49 (bold "bold")
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50 (italic "italic")
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51 (underline "underline")
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52 (fixed "fixed")
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53 (excerpt "excerpt")
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54 (default )
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55 (nil enriched-encode-other-face))
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56 (invisible (t "comment"))
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57 (left-margin (4 "indent"))
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58 (right-margin (4 "indentright"))
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59 (justification (right "flushright")
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60 (left "flushleft")
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61 (full "flushboth")
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62 (center "center"))
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63 ;; The following are not part of the standard:
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64 (FUNCTION (enriched-decode-foreground "x-color")
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65 (enriched-decode-background "x-bg-color"))
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66 (read-only (t "x-read-only"))
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67 (unknown (nil format-annotate-value))
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68 ; (font-size (2 "bigger") ; unimplemented
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69 ; (-2 "smaller"))
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70 )
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71 "List of definitions of text/richtext annotations.
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72 See `format-annotate-region' and `format-deannotate-region' for the definition
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73 of this structure.")
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74
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75
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76 ;;; @ encoder
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77 ;;;
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78
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79 (defun richtext-encode (from to)
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80 (if enriched-verbose (message "Richtext: encoding document..."))
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81 (save-restriction
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82 (narrow-to-region from to)
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83 (delete-to-left-margin)
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84 (unjustify-region)
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85 (goto-char from)
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86 (format-replace-strings '(("<" . "<lt>")))
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87 (format-insert-annotations
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88 (format-annotate-region from (point-max) richtext-translations
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89 'enriched-make-annotation enriched-ignore))
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90 (goto-char from)
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91 (insert (if (stringp enriched-initial-annotation)
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92 richtext-initial-annotation
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93 (funcall richtext-initial-annotation)))
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94 (enriched-map-property-regions 'hard
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95 (lambda (v b e)
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96 (goto-char b)
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97 (if (eolp)
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98 (while (search-forward "\n" nil t)
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99 (replace-match "<nl>\n")
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100 )))
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101 (point) nil)
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102 (if enriched-verbose (message nil))
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103 ;; Return new end.
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104 (point-max)))
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105
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106
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107 ;;; @ decoder
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108 ;;;
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109
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110 (defun richtext-next-annotation ()
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111 "Find and return next text/richtext annotation.
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112 Return value is \(begin end name positive-p), or nil if none was found."
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113 (catch 'tag
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114 (while (re-search-forward richtext-annotation-regexp nil t)
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115 (let* ((beg0 (match-beginning 0))
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116 (end0 (match-end 0))
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117 (beg (match-beginning 1))
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118 (end (match-end 1))
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119 (name (downcase (buffer-substring
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120 (match-beginning 3) (match-end 3))))
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121 (pos (not (match-beginning 2)))
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122 )
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123 (cond ((equal name "lt")
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124 (delete-region beg end)
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125 (goto-char beg)
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126 (insert "<")
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127 )
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128 ((equal name "comment")
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129 (if pos
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130 (throw 'tag (list beg0 end name pos))
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131 (throw 'tag (list beg end0 name pos))
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132 )
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133 )
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134 (t
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135 (throw 'tag (list beg end name pos))
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136 ))
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137 ))))
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138
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139 (defun richtext-decode (from to)
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140 (if enriched-verbose (message "Richtext: decoding document..."))
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141 (save-excursion
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142 (save-restriction
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143 (narrow-to-region from to)
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144 (goto-char from)
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145 (let ((file-width (enriched-get-file-width))
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146 (use-hard-newlines t))
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147 (enriched-remove-header)
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148
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149 (goto-char from)
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150 (while (re-search-forward "\n\n+" nil t)
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151 (replace-match "\n")
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152 )
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153
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154 ;; Deal with newlines
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155 (goto-char from)
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156 (while (re-search-forward "[ \t\n]*<nl>[ \t\n]*" nil t)
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157 (replace-match "\n")
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158 (put-text-property (match-beginning 0) (point) 'hard t)
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159 (put-text-property (match-beginning 0) (point) 'front-sticky nil)
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160 )
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161
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162 ;; Translate annotations
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163 (format-deannotate-region from (point-max) richtext-translations
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164 'richtext-next-annotation)
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165
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166 ;; Fill paragraphs
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167 (if (and file-width ; possible reasons not to fill:
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168 (= file-width (enriched-text-width))) ; correct wd.
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4
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169 ;; Minimally, we have to insert indentation and justification.
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170 (enriched-insert-indentation)
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171 (if enriched-verbose (message "Filling paragraphs..."))
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172 (fill-region (point-min) (point-max))))
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173 (if enriched-verbose (message nil))
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174 (point-max))))
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175
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176
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177 ;;; @ end
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178 ;;;
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179
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180 (provide 'richtext)
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181
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182 ;;; richtext.el ends here
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