Revision: miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-523

Merge from emacs--gnus--5.10, gnus--rel--5.10

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1 files changed, 550 insertions, 0 deletions

diff --git a/lisp/gnus/html2text.el b/lisp/gnus/html2text.el
new file mode 100644
index 00000000000..f2aefbef993
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+++ b/lisp/gnus/html2text.el
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+;;; html2text.el --- a simple html to plain text converter
+;; Copyright (C) 2002, 2003 Free Software Foundation, Inc.
+
+;; Author: Joakim Hove <hove@phys.ntnu.no>
+
+;; 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, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;; These functions provide a simple way to wash/clean html infected
+;; mails.  Definitely do not work in all cases, but some improvement
+;; in readability is generally obtained. Formatting is only done in
+;; the buffer, so the next time you enter the article it will be
+;; "re-htmlized".
+;;
+;; The main function is "html2text"
+
+;;; Code:
+
+;;
+;; <Global variables>
+;;
+
+(eval-when-compile
+  (require 'cl))
+
+(defvar html2text-format-single-element-list '(("hr" . html2text-clean-hr)))
+
+(defvar html2text-replace-list
+  '(("&nbsp;" . " ") ("&gt;" . ">") ("&lt;" . "<") ("&quot;" . "\""))
+  "The map of entity to text.
+
+This is an alist were each element is a dotted pair consisting of an
+old string, and a replacement string. This replacement is done by the
+function \"html2text-substitute\" which basically performs a
+replace-string operation for every element in the list. This is
+completely verbatim - without any use of REGEXP.")
+
+(defvar html2text-remove-tag-list
+  '("html" "body" "p" "img" "dir" "head" "div" "br" "font" "title" "meta")
+  "A list of removable tags.
+
+This is a list of tags which should be removed, without any
+formatting.  Observe that if you the tags in the list are presented
+*without* any \"<\" or \">\". All occurences of a tag appearing in
+this list are removed, irrespective of whether it is a closing or
+opening tag, or if the tag has additional attributes. The actual
+deletion is done by the function \"html2text-remove-tags\".
+
+For instance the text:
+
+\"Here comes something <font size\"+3\" face=\"Helvetica\"> big </font>.\"
+
+will be reduced to:
+
+\"Here comes something big.\"
+
+If this list contains the element \"font\".")
+
+(defvar html2text-format-tag-list
+  '(("b" 	  . html2text-clean-bold)
+    ("u" 	  . html2text-clean-underline)
+    ("i" 	  . html2text-clean-italic)
+    ("blockquote" . html2text-clean-blockquote)
+    ("a"          . html2text-clean-anchor)
+    ("ul"         . html2text-clean-ul)
+    ("ol"         . html2text-clean-ol)
+    ("dl"         . html2text-clean-dl)
+    ("center"     . html2text-clean-center))
+  "An alist of tags and processing functions.
+
+This is an alist where each dotted pair consists of a tag, and then
+the name of a function to be called when this tag is found. The
+function is called with the arguments p1, p2, p3 and p4. These are
+demontrated below:
+
+\"<b> This is bold text </b>\"
+ ^   ^                 ^    ^
+ |   |                 |    |
+p1  p2                p3   p4
+
+Then the called function will typically format the text somewhat and
+remove the tags.")
+
+(defvar html2text-remove-tag-list2  '("li" "dt" "dd" "meta")
+  "Another list of removable tags.
+
+This is a list of tags which are removed similarly to the list
+`html2text-remove-tag-list' - but these tags are retained for the
+formatting, and then moved afterward.")
+
+;;
+;; </Global variables>
+;;
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;;
+;; <Utility functions>
+;;
+
+(defun html2text-buffer-head ()
+  (if (string= mode-name "Article")
+      (beginning-of-buffer)
+    (beginning-of-buffer)
+    )
+  )
+
+(defun html2text-replace-string (from-string to-string p1 p2)
+  (goto-char p1)
+  (let ((delta (- (string-width to-string) (string-width from-string)))
+	(change 0))
+    (while (search-forward from-string p2 t)
+      (replace-match to-string)
+      (setq change (+ change delta))
+      )
+    change
+    )
+  )
+
+;;
+;; </Utility functions>
+;;
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;;
+;; <Functions related to attributes> i.e. <font size=+3>
+;;
+
+(defun html2text-attr-value (attr-list attr)
+  (nth 1 (assoc attr attr-list))
+  )
+
+(defun html2text-get-attr (p1 p2 tag)
+  (goto-char p1)
+  (re-search-forward " +[^ ]" p2 t)
+  (let* ((attr-string (buffer-substring-no-properties (1- (point)) (1- p2)))
+	 (tmp-list (split-string attr-string))
+	 (attr-list)
+	 (counter 0)
+	 (prev (car tmp-list))
+	 (this (nth 1 tmp-list))
+	 (next (nth 2 tmp-list))
+	 (index 1))
+
+    (cond
+     ;; size=3
+     ((string-match "[^ ]=[^ ]" prev)
+      (let ((attr  (nth 0 (split-string prev "=")))
+	    (value (nth 1 (split-string prev "="))))
+	(setq attr-list (cons (list attr value) attr-list))
+	)
+      )
+     ;; size= 3
+     ((string-match "[^ ]=\\'" prev)
+      (setq attr-list (cons (list (substring prev 0 -1) this) attr-list))
+      )
+     )
+
+    (while (< index (length tmp-list))
+      (cond
+       ;; size=3
+       ((string-match "[^ ]=[^ ]" this)
+	(let ((attr  (nth 0 (split-string this "=")))
+	      (value (nth 1 (split-string this "="))))
+	  (setq attr-list (cons (list attr value) attr-list))
+	  )
+	)
+       ;; size =3
+       ((string-match "\\`=[^ ]" this)
+	(setq attr-list (cons (list prev (substring this 1)) attr-list)))
+
+       ;; size= 3
+       ((string-match "[^ ]=\\'" this)
+	(setq attr-list (cons (list (substring this 0 -1) next) attr-list))
+	)
+
+       ;; size = 3
+       ((string= "=" this)
+	(setq attr-list (cons (list prev next) attr-list))
+	)
+       )
+      (setq index (1+ index))
+      (setq prev this)
+      (setq this next)
+      (setq next (nth (1+ index) tmp-list))
+      )
+
+    ;;
+    ;; Tags with no accompanying "=" i.e. value=nil
+    ;;
+    (setq prev (car tmp-list))
+    (setq this (nth 1 tmp-list))
+    (setq next (nth 2 tmp-list))
+    (setq index 1)
+
+    (if (not (string-match "=" prev))
+	(progn
+	  (if (not (string= (substring this 0 1) "="))
+	      (setq attr-list (cons (list prev nil) attr-list))
+	    )
+	  )
+      )
+
+    (while (< index (1- (length tmp-list)))
+      (if (not (string-match "=" this))
+	  (if (not (or (string= (substring next 0 1) "=")
+		       (string= (substring prev -1) "=")))
+	      (setq attr-list (cons (list this nil) attr-list))
+	    )
+	)
+      (setq index (1+ index))
+      (setq prev this)
+      (setq this next)
+      (setq next (nth (1+ index) tmp-list))
+      )
+
+    (if this
+	(progn
+	  (if (not (string-match "=" this))
+	      (progn
+		(if (not (string= (substring prev -1) "="))
+		    (setq attr-list (cons (list this nil) attr-list))
+		  )
+		)
+	    )
+	  )
+      )
+    attr-list ;; return - value
+    )
+  )
+
+;;
+;; </Functions related to attributes>
+;;
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;;
+;; <Functions to be called to format a tag-pair>
+;;
+(defun html2text-clean-list-items (p1 p2 list-type)
+  (goto-char p1)
+  (let ((item-nr 0)
+	(items   0))
+    (while (re-search-forward "<li>" p2 t)
+      (setq items (1+ items)))
+    (goto-char p1)
+    (while (< item-nr items)
+      (setq item-nr (1+ item-nr))
+      (re-search-forward "<li>" (point-max) t)
+      (cond
+       ((string= list-type "ul") (insert " o "))
+       ((string= list-type "ol") (insert (format " %s: " item-nr)))
+       (t (insert " x ")))
+      )
+    )
+  )
+
+(defun html2text-clean-dtdd (p1 p2)
+  (goto-char p1)
+  (let ((items   0)
+	(item-nr 0))
+    (while (re-search-forward "<dt>" p2 t)
+      (setq items (1+ items)))
+    (goto-char p1)
+    (while (< item-nr items)
+      (setq item-nr (1+ item-nr))
+      (re-search-forward "<dt>\\([ ]*\\)" (point-max) t)
+      (when (match-string 1)
+	(delete-region (point) (- (point) (string-width (match-string 1)))))
+      (let ((def-p1 (point))
+	    (def-p2 0))
+	(re-search-forward "\\([ ]*\\)\\(</dt>\\|<dd>\\)" (point-max) t)
+	(if (match-string 1)
+	    (progn
+	      (let* ((mw1 (string-width (match-string 1)))
+		     (mw2 (string-width (match-string 2)))
+		     (mw  (+ mw1 mw2)))
+		(goto-char (- (point) mw))
+		(delete-region (point) (+ (point) mw1))
+		(setq def-p2 (point))))
+	  (setq def-p2 (- (point) (string-width (match-string 2)))))
+	(put-text-property def-p1 def-p2 'face 'bold)))))
+
+(defun html2text-delete-tags (p1 p2 p3 p4)
+  (delete-region p1 p2)
+  (delete-region (- p3 (- p2 p1)) (- p4 (- p2 p1))))
+
+(defun html2text-delete-single-tag (p1 p2)
+  (delete-region p1 p2))
+
+(defun html2text-clean-hr (p1 p2)
+  (html2text-delete-single-tag p1 p2)
+  (goto-char p1)
+  (newline 1)
+  (insert (make-string fill-column ?-))
+  )
+
+(defun html2text-clean-ul (p1 p2 p3 p4)
+  (html2text-delete-tags p1 p2 p3 p4)
+  (html2text-clean-list-items p1 (- p3 (- p1 p2)) "ul")
+  )
+
+(defun html2text-clean-ol (p1 p2 p3 p4)
+  (html2text-delete-tags p1 p2 p3 p4)
+  (html2text-clean-list-items p1 (- p3 (- p1 p2)) "ol")
+  )
+
+(defun html2text-clean-dl (p1 p2 p3 p4)
+  (html2text-delete-tags p1 p2 p3 p4)
+  (html2text-clean-dtdd p1 (- p3 (- p1 p2)))
+  )
+
+(defun html2text-clean-center (p1 p2 p3 p4)
+  (html2text-delete-tags p1 p2 p3 p4)
+  (center-region p1 (- p3 (- p2 p1)))
+  )
+
+(defun html2text-clean-bold (p1 p2 p3 p4)
+  (put-text-property p2 p3 'face 'bold)
+  (html2text-delete-tags p1 p2 p3 p4)
+  )
+
+(defun html2text-clean-title (p1 p2 p3 p4)
+  (put-text-property p2 p3 'face 'bold)
+  (html2text-delete-tags p1 p2 p3 p4)
+  )
+
+(defun html2text-clean-underline (p1 p2 p3 p4)
+  (put-text-property p2 p3 'face 'underline)
+  (html2text-delete-tags p1 p2 p3 p4)
+  )
+
+(defun html2text-clean-italic (p1 p2 p3 p4)
+  (put-text-property p2 p3 'face 'italic)
+  (html2text-delete-tags p1 p2 p3 p4)
+  )
+
+(defun html2text-clean-font (p1 p2 p3 p4)
+  (html2text-delete-tags p1 p2 p3 p4)
+  )
+
+(defun html2text-clean-blockquote (p1 p2 p3 p4)
+  (html2text-delete-tags p1 p2 p3 p4)
+  )
+
+(defun html2text-clean-anchor (p1 p2 p3 p4)
+  ;; If someone can explain how to make the URL clickable I will
+  ;; surely improve upon this.
+  (let* ((attr-list (html2text-get-attr p1 p2 "a"))
+	 (href (html2text-attr-value attr-list "href")))
+    (delete-region p1 p4)
+    (when href
+      (goto-char p1)
+      (insert (substring href 1 -1 ))
+      (put-text-property p1 (point) 'face 'bold))))
+
+;;
+;; </Functions to be called to format a tag-pair>
+;;
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;;
+;; <Functions to be called to fix up paragraphs>
+;;
+
+(defun html2text-fix-paragraph (p1 p2)
+  (goto-char p1)
+  (let ((has-br-line)
+	(refill-start)
+	(refill-stop))
+    (if (re-search-forward "<br>$" p2 t)
+	(setq has-br-line t)
+      )
+    (if has-br-line
+	(progn
+	  (goto-char p1)
+	  (if (re-search-forward ".+[^<][^b][^r][^>]$" p2 t)
+	      (progn
+		(beginning-of-line)
+		(setq refill-start (point))
+		(goto-char p2)
+		(re-search-backward ".+[^<][^b][^r][^>]$" refill-start t)
+		(next-line 1)
+		(end-of-line)
+		;; refill-stop should ideally be adjusted to
+		;; accomodate the "<br>" strings which are removed
+		;; between refill-start and refill-stop.  Can simply
+		;; be returned from my-replace-string
+		(setq refill-stop (+ (point)
+				     (html2text-replace-string
+				      "<br>" ""
+				      refill-start (point))))
+		;; (message "Point = %s  refill-stop = %s" (point) refill-stop)
+		;; (sleep-for 4)
+		(fill-region refill-start refill-stop)
+		)
+	    )
+	  )
+      )
+    )
+  (html2text-replace-string "<br>" "" p1 p2)
+  )
+
+;;
+;; This one is interactive ...
+;;
+(defun html2text-fix-paragraphs ()
+  "This _tries_ to fix up the paragraphs - this is done in quite a ad-hook
+fashion, quite close to pure guess-work. It does work in some cases though."
+  (interactive)
+  (html2text-buffer-head)
+  (replace-regexp "^<br>$" "")
+  ;; Removing lonely <br> on a single line, if they are left intact we
+  ;; dont have any paragraphs at all.
+  (html2text-buffer-head)
+  (while (not (eobp))
+    (let ((p1 (point)))
+      (forward-paragraph 1)
+      ;;(message "Kaller fix med p1=%s  p2=%s " p1 (1- (point))) (sleep-for 5)
+      (html2text-fix-paragraph p1 (1- (point)))
+      (goto-char p1)
+      (when (not (eobp))
+	(forward-paragraph 1)))))
+
+;;
+;; </Functions to be called to fix up paragraphs>
+;;
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;;
+;; <Interactive functions>
+;;
+
+(defun html2text-remove-tags (tag-list)
+  "Removes the tags listed in the list \"html2text-remove-tag-list\".
+See the documentation for that variable."
+  (interactive)
+  (dolist (tag tag-list)
+    (html2text-buffer-head)
+    (while (re-search-forward (format "\\(</?%s[^>]*>\\)" tag) (point-max) t)
+      (delete-region (match-beginning 0) (match-end 0)))))
+
+(defun html2text-format-tags ()
+  "See the variable \"html2text-format-tag-list\" for documentation"
+  (interactive)
+  (dolist (tag-and-function html2text-format-tag-list)
+    (let ((tag      (car tag-and-function))
+	  (function (cdr tag-and-function)))
+      (html2text-buffer-head)
+      (while (re-search-forward (format "\\(<%s\\( [^>]*\\)?>\\)" tag)
+				(point-max) t)
+	(let ((p1)
+	      (p2 (point))
+	      (p3) (p4)
+	      (attr (match-string 1)))
+	  (search-backward "<" (point-min) t)
+	  (setq p1 (point))
+	  (re-search-forward (format "</%s>" tag) (point-max) t)
+	  (setq p4 (point))
+	  (search-backward "</" (point-min) t)
+	  (setq p3 (point))
+	  (funcall function p1 p2 p3 p4)
+	  (goto-char p1)
+	  )
+	)
+      )
+    )
+  )
+
+(defun html2text-substitute ()
+  "See the variable \"html2text-replace-list\" for documentation"
+  (interactive)
+  (dolist (e html2text-replace-list)
+    (html2text-buffer-head)
+    (let ((old-string (car e))
+	  (new-string (cdr e)))
+      (html2text-replace-string old-string new-string (point-min) (point-max))
+      )
+    )
+  )
+
+(defun html2text-format-single-elements ()
+  ""
+  (interactive)
+  (dolist (tag-and-function html2text-format-single-element-list)
+    (let ((tag      (car tag-and-function))
+	  (function (cdr tag-and-function)))
+      (html2text-buffer-head)
+      (while (re-search-forward (format "\\(<%s\\( [^>]*\\)?>\\)" tag)
+				(point-max) t)
+	(let ((p1)
+	      (p2 (point)))
+	  (search-backward "<" (point-min) t)
+	  (setq p1 (point))
+	  (funcall function p1 p2)
+	  )
+	)
+      )
+    )
+  )
+
+;;
+;; Main function
+;;
+
+;;;###autoload
+(defun html2text ()
+  "Convert HTML to plain text in the current buffer."
+  (interactive)
+  (save-excursion
+    (let ((case-fold-search t)
+	  (buffer-read-only))
+      (html2text-remove-tags html2text-remove-tag-list)
+      (html2text-format-tags)
+      (html2text-remove-tags html2text-remove-tag-list2)
+      (html2text-substitute)
+      (html2text-format-single-elements)
+      (html2text-fix-paragraphs))))
+
+;;
+;; </Interactive functions>
+;;
+
+;;; arch-tag: e9e57b79-35d4-4de1-a647-e7e01fe56d1e
+;;; html2text.el ends here