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richtext.el
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richtext.el
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;;;
;;; richtext.el -- read and save files in text/richtext format
;;;
;;; Copyright (C) 1995 Free Software Foundation, Inc.
;;; Copyright (C) 1995 MORIOKA Tomohiko
;;;
;;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
;;; Created: 1995/7/15
;;; Version:
;;; $Id$
;;; Keywords: wp, faces, MIME, multimedia
;;;
;;; This file is part of GNU Emacs.
;;;
;;; GNU Emacs is free software; you can redistribute it and/or modify
;;; it under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 2, or (at your option)
;;; any later version.
;;;
;;; GNU Emacs is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Emacs; see the file COPYING. If not, write to
;;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
(require 'enriched)
;;; @ variables
;;;
(defconst richtext-initial-annotation
(lambda ()
(format "Content-Type: text/richtext\nText-Width: %d\n\n"
(enriched-text-width)))
"What to insert at the start of a text/richtext file.
If this is a string, it is inserted. If it is a list, it should be a lambda
expression, which is evaluated to get the string to insert.")
(defconst richtext-annotation-regexp
"[ \t\n]*\\(<\\(/\\)?\\([-A-za-z0-9]+\\)>\\)[ \t\n]*"
"Regular expression matching richtext annotations.")
(defconst richtext-translations
'((face (bold-italic "bold" "italic")
(bold "bold")
(italic "italic")
(underline "underline")
(fixed "fixed")
(excerpt "excerpt")
(default )
(nil enriched-encode-other-face))
(invisible (t "comment"))
(left-margin (4 "indent"))
(right-margin (4 "indentright"))
(justification (right "flushright")
(left "flushleft")
(full "flushboth")
(center "center"))
;; The following are not part of the standard:
(FUNCTION (enriched-decode-foreground "x-color")
(enriched-decode-background "x-bg-color"))
(read-only (t "x-read-only"))
(unknown (nil format-annotate-value))
; (font-size (2 "bigger") ; unimplemented
; (-2 "smaller"))
)
"List of definitions of text/richtext annotations.
See `format-annotate-region' and `format-deannotate-region' for the definition
of this structure.")
;;; @ encoder
;;;
(defun richtext-encode (from to)
(if enriched-verbose (message "Richtext: encoding document..."))
(save-restriction
(narrow-to-region from to)
(delete-to-left-margin)
(unjustify-region)
(goto-char from)
(format-replace-strings '(("<" . "<lt>")))
(format-insert-annotations
(format-annotate-region from (point-max) richtext-translations
'enriched-make-annotation enriched-ignore))
(goto-char from)
(insert (if (stringp enriched-initial-annotation)
richtext-initial-annotation
(funcall richtext-initial-annotation)))
(enriched-map-property-regions 'hard
(lambda (v b e)
(goto-char b)
(if (eolp)
(while (search-forward "\n" nil t)
(replace-match "<nl>\n")
)))
(point) nil)
(if enriched-verbose (message nil))
;; Return new end.
(point-max)))
;;; @ decoder
;;;
(defun richtext-next-annotation ()
"Find and return next text/richtext annotation.
Return value is \(begin end name positive-p), or nil if none was found."
(catch 'tag
(while (re-search-forward richtext-annotation-regexp nil t)
(let* ((beg0 (match-beginning 0))
(end0 (match-end 0))
(beg (match-beginning 1))
(end (match-end 1))
(name (downcase (buffer-substring
(match-beginning 3) (match-end 3))))
(pos (not (match-beginning 2)))
)
(cond ((equal name "lt")
(delete-region beg end)
(goto-char beg)
(insert "<")
)
((equal name "comment")
(if pos
(throw 'tag (list beg0 end name pos))
(throw 'tag (list beg end0 name pos))
)
)
(t
(throw 'tag (list beg end name pos))
))
))))
(defun richtext-decode (from to)
(if enriched-verbose (message "Richtext: decoding document..."))
(save-excursion
(save-restriction
(narrow-to-region from to)
(goto-char from)
(let ((file-width (enriched-get-file-width))
(use-hard-newlines t) pc nc)
(enriched-remove-header)
(goto-char from)
(while (re-search-forward "\n\n+" nil t)
(replace-match "\n")
)
;; Deal with newlines
(goto-char from)
(while (re-search-forward "[ \t\n]*<nl>[ \t\n]*" nil t)
(replace-match "\n")
(put-text-property (match-beginning 0) (point) 'hard t)
(put-text-property (match-beginning 0) (point) 'front-sticky nil)
)
;; Translate annotations
(format-deannotate-region from (point-max) richtext-translations
'richtext-next-annotation)
;; Fill paragraphs
(if (or (and file-width ; possible reasons not to fill:
(= file-width (enriched-text-width))) ; correct wd.
(null enriched-fill-after-visiting) ; never fill
(and (eq 'ask enriched-fill-after-visiting) ; asked & declined
(not (y-or-n-p "Re-fill for current display width? "))))
;; Minimally, we have to insert indentation and justification.
(enriched-insert-indentation)
(if enriched-verbose (message "Filling paragraphs..."))
(fill-region (point-min) (point-max))))
(if enriched-verbose (message nil))
(point-max))))
;;; @ end
;;;
(provide 'richtext)