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comparison lisp/apel/richtext.el @ 155:43dd3413c7c7 r20-3b4

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Import from CVS: tag r20-3b4
author cvs
date Mon, 13 Aug 2007 09:39:39 +0200
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154:94141801dd7e 155:43dd3413c7c7
1 ;;; richtext.el -- read and save files in text/richtext format
2
3 ;; Copyright (C) 1995,1996,1997 Free Software Foundation, Inc.
4
5 ;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
6 ;; Created: 1995/7/15
7 ;; Version: $Id: richtext.el,v 1.1 1997/06/03 04:18:36 steve Exp $
8 ;; Keywords: wp, faces, MIME, multimedia
9
10 ;; This file is not part of GNU Emacs yet.
11
12 ;; This program is free software; you can redistribute it and/or
13 ;; modify it under the terms of the GNU General Public License as
14 ;; published by the Free Software Foundation; either version 2, or (at
15 ;; your option) any later version.
16
17 ;; This program is distributed in the hope that it will be useful, but
18 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 ;; General Public License for more details.
21
22 ;; You should have received a copy of the GNU General Public License
23 ;; along with GNU Emacs; see the file COPYING. If not, write to the
24 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
25 ;; Boston, MA 02111-1307, USA.
26
27 ;;; Code:
28
29 (require 'enriched)
30
31
32 ;;; @ variables
33 ;;;
34
35 (defconst richtext-initial-annotation
36 (lambda ()
37 (format "Content-Type: text/richtext\nText-Width: %d\n\n"
38 (enriched-text-width)))
39 "What to insert at the start of a text/richtext file.
40 If this is a string, it is inserted. If it is a list, it should be a lambda
41 expression, which is evaluated to get the string to insert.")
42
43 (defconst richtext-annotation-regexp
44 "[ \t\n]*\\(<\\(/\\)?\\([-A-za-z0-9]+\\)>\\)[ \t\n]*"
45 "Regular expression matching richtext annotations.")
46
47 (defconst richtext-translations
48 '((face (bold-italic "bold" "italic")
49 (bold "bold")
50 (italic "italic")
51 (underline "underline")
52 (fixed "fixed")
53 (excerpt "excerpt")
54 (default )
55 (nil enriched-encode-other-face))
56 (invisible (t "comment"))
57 (left-margin (4 "indent"))
58 (right-margin (4 "indentright"))
59 (justification (right "flushright")
60 (left "flushleft")
61 (full "flushboth")
62 (center "center"))
63 ;; The following are not part of the standard:
64 (FUNCTION (enriched-decode-foreground "x-color")
65 (enriched-decode-background "x-bg-color"))
66 (read-only (t "x-read-only"))
67 (unknown (nil format-annotate-value))
68 ; (font-size (2 "bigger") ; unimplemented
69 ; (-2 "smaller"))
70 )
71 "List of definitions of text/richtext annotations.
72 See `format-annotate-region' and `format-deannotate-region' for the definition
73 of this structure.")
74
75
76 ;;; @ encoder
77 ;;;
78
79 (defun richtext-encode (from to)
80 (if enriched-verbose (message "Richtext: encoding document..."))
81 (save-restriction
82 (narrow-to-region from to)
83 (delete-to-left-margin)
84 (unjustify-region)
85 (goto-char from)
86 (format-replace-strings '(("<" . "<lt>")))
87 (format-insert-annotations
88 (format-annotate-region from (point-max) richtext-translations
89 'enriched-make-annotation enriched-ignore))
90 (goto-char from)
91 (insert (if (stringp enriched-initial-annotation)
92 richtext-initial-annotation
93 (funcall richtext-initial-annotation)))
94 (enriched-map-property-regions 'hard
95 (lambda (v b e)
96 (goto-char b)
97 (if (eolp)
98 (while (search-forward "\n" nil t)
99 (replace-match "<nl>\n")
100 )))
101 (point) nil)
102 (if enriched-verbose (message nil))
103 ;; Return new end.
104 (point-max)))
105
106
107 ;;; @ decoder
108 ;;;
109
110 (defun richtext-next-annotation ()
111 "Find and return next text/richtext annotation.
112 Return value is \(begin end name positive-p), or nil if none was found."
113 (catch 'tag
114 (while (re-search-forward richtext-annotation-regexp nil t)
115 (let* ((beg0 (match-beginning 0))
116 (end0 (match-end 0))
117 (beg (match-beginning 1))
118 (end (match-end 1))
119 (name (downcase (buffer-substring
120 (match-beginning 3) (match-end 3))))
121 (pos (not (match-beginning 2)))
122 )
123 (cond ((equal name "lt")
124 (delete-region beg end)
125 (goto-char beg)
126 (insert "<")
127 )
128 ((equal name "comment")
129 (if pos
130 (throw 'tag (list beg0 end name pos))
131 (throw 'tag (list beg end0 name pos))
132 )
133 )
134 (t
135 (throw 'tag (list beg end name pos))
136 ))
137 ))))
138
139 (defun richtext-decode (from to)
140 (if enriched-verbose (message "Richtext: decoding document..."))
141 (save-excursion
142 (save-restriction
143 (narrow-to-region from to)
144 (goto-char from)
145 (let ((file-width (enriched-get-file-width))
146 (use-hard-newlines t))
147 (enriched-remove-header)
148
149 (goto-char from)
150 (while (re-search-forward "\n\n+" nil t)
151 (replace-match "\n")
152 )
153
154 ;; Deal with newlines
155 (goto-char from)
156 (while (re-search-forward "[ \t\n]*<nl>[ \t\n]*" nil t)
157 (replace-match "\n")
158 (put-text-property (match-beginning 0) (point) 'hard t)
159 (put-text-property (match-beginning 0) (point) 'front-sticky nil)
160 )
161
162 ;; Translate annotations
163 (format-deannotate-region from (point-max) richtext-translations
164 'richtext-next-annotation)
165
166 ;; Fill paragraphs
167 (if (and file-width ; possible reasons not to fill:
168 (= file-width (enriched-text-width))) ; correct wd.
169 ;; Minimally, we have to insert indentation and justification.
170 (enriched-insert-indentation)
171 (if enriched-verbose (message "Filling paragraphs..."))
172 (fill-region (point-min) (point-max))))
173 (if enriched-verbose (message nil))
174 (point-max))))
175
176
177 ;;; @ end
178 ;;;
179
180 (provide 'richtext)
181
182 ;;; richtext.el ends here