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1;;; libxml-doc.el - look up libxml-symbols and start browser on documentation
2
3;; Author: Felix Natter <fnatter@gmx.net>, Geert Kloosterman <geertk@ai.rug.nl>
4;; Created: Jun 21 2000
5;; Keywords: libxml documentation
6
7;; This program is free software; you can redistribute it and/or
8;; modify it under the terms of the GNU General Public License
9;; as published by the Free Software Foundation; either version 2
10;; of the License, or (at your option) any later version.
11;;
12;; This program is distributed in the hope that it will be useful,
13;; but WITHOUT ANY WARRANTY; without even the implied warranty of
14;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15;; GNU General Public License for more details.
16;;
17;; You should have received a copy of the GNU General Public License
18;; along with this program; if not, write to the Free Software
19;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20
21 ;;; Commentary / README
22
23;; these functions allow you to browse the libxml documentation
24;; (using lynx within emacs by default)
25;;
26;; ----- Installing
27;; 1. add the following to ~/.emacs (adapt path and remove comments !)
28;; (autoload 'libxmldoc-lookup-symbol "~/elisp/libxml-doc"
29;;  "Look up libxml-symbols and start browser on documentation." t)
30;; or put this file in load-path and use this:
31;; (autoload 'libxmldoc-lookup-symbol "libxml-doc"
32;;  "Look up libxml-symbols and start browser on documentation." t)
33;;
34;; 2. adapt libxmldoc-root:
35;; i.e. (setq libxmldoc-root "~/libxml2-2.0.0/doc/html")
36;;
37;; 3. change the filter-regex: by default, cpp-defines, callbacks and
38;; html-functions are excluded (C-h v libxmldoc-filter-regexp)
39;;
40;; 4. consider customizing libxmldoc-browse-url (lynx by default);
41;; cannot use Emacs/W3 4.0pre46 because it has problems with the html
42;;
43;; ----- Using
44;; call M-x libxmldoc-lookup-symbol: this will prompt with completion and
45;; then open the browser showing the documentation. If the word around the
46;; point matches a symbol, that is used instead.  You can also call
47;; libxmldoc-lookup-symbol noninteractively and pass the symbol.
48
49;; Note:
50;; an alternative to libxml-doc is emacs tags:
51;; $ cd libxml2-2.3.8
52;; $ make TAGS
53;; $ emacs
54;; M-. (M-x find-tag) ...  or
55;; M-x tags-search ... RET M-, M-, ...
56;; (for more information: info emacs RET m Tags RET)
57
58
59 ;;; ChangeLog:
60;; Wed Jun 21 01:07:12 2000: initial release
61;; Wed Jun 21 01:45:29 2000: added libxmldoc-lookup-symbol-at-point
62;; Wed Jun 21 23:37:58 2000: libxmldoc-lookup-symbol now uses
63;; (thing-at-point 'word) if it matches a symbol
64;; Thu Jun 22 02:37:46 2000: filtering is only done for completion
65;; Thu Jun 22 21:03:41 2000: libxmldoc-browse-url can be customized
66;; Thu May 31 2001 (Geert):
67;;       - Changed the `gnome-xml-' html file prefix into `libxml-'.
68;;       - Changed the 'word match from thing-at-point into 'symbol.
69;;         With 'word, identifiers with an underscore (e.g. BAD_CAST)
70;;         don't get matched.
71;; Fri Jun  8 16:29:18 2001, Sat Jun 23 16:19:47 2001:
72;; complete rewrite of libxmldoc-lookup-symbol
73;; by Felix Natter <fnatter@gmx.net>, Geert Kloosterman <geertk@ai.rug.nl>:
74;;       - Now keeps the list of symbols between calls to speed things up.
75;;       - filtering is only used when no symbol is passed and
76;;       thing-at-point does not match a symbol and "*" + thing-at-point
77;;       does not match a symbol (this is used to catch callbacks) and
78;;       libxmldoc-filter-regexp is non-nil.
79;; Sat Jun 23 16:20:34 2001: update the docstrings
80;; Sat Jun 23 16:22:54 2001 (Geert Kloosterman <geertk@ai.rug.nl>):
81;; update README: use autoload instead of load+c-mode-hook
82;; Sat Jul 7 19:00:31 2001: fixed a problem with XEmacs: the
83;; string-match of XEmacs when used in completing-read used the
84;; minibuffer's value of case-fold-search, and not the one in the
85;; c-mode buffer that we had set => so there's a new *-string-match-cs
86;; (case sensitive) function which binds case-fold-search and runs string-match
87;; Wed Sep 1 20:26:29 2004: adapted for libxml2-2.6.9: handle
88;; document-relative (#XXX) links
89
90;;; TODO:
91;; - use command-execute for libxmldoc-browse-url
92;; - keep (match-string 1) in a variable (libxmldoc-get-list-of-symbols)
93;;   (only if it improves performance)
94;; - check the (require ..)-statements
95
96 ;;; Code:
97
98(require 'browse-url)
99(require 'term)
100
101(defvar libxmldoc-root "~/src/libxml2-2.3.8/doc/html"
102  "The root-directory of the libxml2-documentation (~ will be expanded).")
103(defvar libxmldoc-filter-regexp "^html\\|^\\*\\|^[A-Z_]+"
104  "Symbols that match this regular expression will be excluded when doing
105completion and no symbol is specified.
106 For example:
107   callbacks:     \"^\\\\*\"
108   cpp-defines:   \"[A-Z_]+\"
109   xml-functions  \"^xml\"
110   html-functions \"^html\"
111   sax-functions  \".*SAX\"
112By default, callbacks, cpp-defines and html* are excluded.
113Set this to nil if you don't want filtering.")
114(defvar libxmldoc-browse-url 'browse-url-lynx-emacs
115  "Browser used for browsing documentation. Emacs/W3 4.0pre46 cannot handle
116the html (and would be too slow), so lynx-emacs is used by default.")
117(defvar libxmldoc-symbol-history nil
118  "History for looking up libxml-symbols.")
119(defvar libxmldoc-symbols nil
120  "The list of libxml-symbols.")
121
122 ;;;; public functions
123
124(defun libxmldoc-lookup-symbol(&optional symbol)
125  "Look up xml-symbol." (interactive)
126  ;; setting case-fold-search is now done in libxmldoc-string-match-cs
127
128  ;; Build up a symbol list if necessary
129  (if (null libxmldoc-symbols)
130      (setq libxmldoc-symbols (libxmldoc-get-list-of-symbols)))
131
132  (cond
133   (symbol ;; symbol is specified as argument
134    (if (not (assoc symbol libxmldoc-symbols))
135        (setq symbol nil)))
136   ((assoc (thing-at-point 'symbol) libxmldoc-symbols)
137    (setq symbol (thing-at-point 'symbol)))
138   ;; this is needed to catch callbacks
139   ;; note: this could be rewritten to use (thing-at-point 'word)
140   ((assoc (concat "*" (thing-at-point 'symbol)) libxmldoc-symbols)
141    (setq symbol (concat "*" (thing-at-point 'symbol))))
142   )
143
144  ;; omit "" t) from call to completing-read for the sake of xemacs
145  (setq symbol (completing-read
146                "Libxml: " libxmldoc-symbols
147                (if (or symbol (null libxmldoc-filter-regexp))
148                    nil
149                  '(lambda(key,value)
150                     (not (libxmldoc-string-match-cs libxmldoc-filter-regexp
151                                                     (car key,value)))))
152                t symbol
153                'libxmldoc-symbol-history))
154
155
156  ;; start browser
157  (apply libxmldoc-browse-url
158         (list (cdr (assoc symbol libxmldoc-symbols)))))
159
160;; (if (or symbol
161;;         (null libxmldoc-filter-regexp))
162;;     libxmldoc-symbols
163;;   (mapcar
164;;    '(lambda(key,value)
165;;       (if (null (string-match
166;;                  libxmldoc-filter-regexp
167;;                  (car key,value)))
168;;           key,value))
169;;    libxmldoc-symbols))
170
171
172;;;; internal
173
174(defun libxmldoc-string-match-cs(regexp str)
175  "This is needed because string-match in XEmacs uses the current-
176buffer's value of case-fold-search (different from GNU Emacs)."
177  (let ((case-fold-search nil))
178    (string-match regexp str)))
179
180(defun libxmldoc-get-list-of-symbols()
181  "Get the list of html-links in the libxml-documentation."
182  (let ((files
183         (directory-files
184          libxmldoc-root t
185          (concat "^" (if (file-exists-p (concat libxmldoc-root
186                                                 "/libxml-parser.html"))
187                          "libxml-"
188                        "gnome-xml-")
189                  ".*\\.html$") t))
190        (symbols ())
191        (case-fold-search t)
192        (uri))
193    (message "collecting libxml-symbols...")
194    (while (car files)
195      (message "processing %s" (car files))
196      (with-temp-buffer
197        (insert-file-contents (car files))
198        (goto-char (point-min))
199        (while (re-search-forward
200                "<a[^>]*href[ \t\n]*=[ \t\n]*\"\\([^=>]*\\)\"[^>]*>" nil t nil)
201          ;; is it a relative link (#XXX)?
202          (if (char-equal (elt (match-string 1) 0) ?#)
203              (setq uri (concat "file://" (car files) (match-string 1)))
204            (setq uri (concat "file://" (expand-file-name libxmldoc-root)
205                              "/" (match-string 1))))
206          (if (not (re-search-forward "\\([^<]*\\)<" nil t nil))
207              (error "regexp error while getting libxml-symbols.."))
208          ;; this needs add-to-list because i.e. xmlChar appears often
209          (if (not (string-equal "" (match-string 1)))
210              (add-to-list 'symbols (cons (match-string 1) uri))))
211        ;;  (setq symbols (cons (cons (match-string 1) uri) symbols)))
212        )
213      (setq files (cdr files)))
214    symbols))
215
216(provide 'libxmldoc)
217
218;;; libxml-doc.el ends here
219
220;;; Local Variables:
221;;; indent-tabs-mode: nil
222;;; End:
223