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;;; libxml-doc.el - look up libxml-symbols and start browser on documentation
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;; Author: Felix Natter <fnatter@gmx.net>, Geert Kloosterman <geertk@ai.rug.nl>
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;; Created: Jun 21 2000
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;; Keywords: libxml documentation
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;; This program is free software; you can redistribute it and/or
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;; modify it under the terms of the GNU General Public License
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;; as published by the Free Software Foundation; either version 2
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;; of the License, or (at your option) any later version.
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;;
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with this program; if not, write to the Free Software
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;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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;;; Commentary / README
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;; these functions allow you to browse the libxml documentation
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;; (using lynx within emacs by default)
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;;
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;; ----- Installing
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;; 1. add the following to ~/.emacs (adapt path and remove comments !)
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;; (autoload 'libxmldoc-lookup-symbol "~/elisp/libxml-doc"
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;; "Look up libxml-symbols and start browser on documentation." t)
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;; or put this file in load-path and use this:
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;; (autoload 'libxmldoc-lookup-symbol "libxml-doc"
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;; "Look up libxml-symbols and start browser on documentation." t)
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;;
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;; 2. adapt libxmldoc-root:
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;; i.e. (setq libxmldoc-root "~/libxml2-2.0.0/doc/html")
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;;
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;; 3. change the filter-regex: by default, cpp-defines, callbacks and
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;; html-functions are excluded (C-h v libxmldoc-filter-regexp)
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;;
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;; 4. consider customizing libxmldoc-browse-url (lynx by default);
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;; cannot use Emacs/W3 4.0pre46 because it has problems with the html
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;;
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;; ----- Using
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;; call M-x libxmldoc-lookup-symbol: this will prompt with completion and
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;; then open the browser showing the documentation. If the word around the
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;; point matches a symbol, that is used instead. You can also call
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;; libxmldoc-lookup-symbol noninteractively and pass the symbol.
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;; Note:
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;; an alternative to libxml-doc is emacs tags:
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;; $ cd libxml2-2.3.8
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;; $ make TAGS
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;; $ emacs
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;; M-. (M-x find-tag) ... or
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;; M-x tags-search ... RET M-, M-, ...
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;; (for more information: info emacs RET m Tags RET)
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;;; ChangeLog:
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;; Wed Jun 21 01:07:12 2000: initial release
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;; Wed Jun 21 01:45:29 2000: added libxmldoc-lookup-symbol-at-point
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;; Wed Jun 21 23:37:58 2000: libxmldoc-lookup-symbol now uses
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;; (thing-at-point 'word) if it matches a symbol
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;; Thu Jun 22 02:37:46 2000: filtering is only done for completion
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;; Thu Jun 22 21:03:41 2000: libxmldoc-browse-url can be customized
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;; Thu May 31 2001 (Geert):
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;; - Changed the `gnome-xml-' html file prefix into `libxml-'.
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;; - Changed the 'word match from thing-at-point into 'symbol.
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;; With 'word, identifiers with an underscore (e.g. BAD_CAST)
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;; don't get matched.
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;; Fri Jun 8 16:29:18 2001, Sat Jun 23 16:19:47 2001:
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;; complete rewrite of libxmldoc-lookup-symbol
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;; by Felix Natter <fnatter@gmx.net>, Geert Kloosterman <geertk@ai.rug.nl>:
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;; - Now keeps the list of symbols between calls to speed things up.
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;; - filtering is only used when no symbol is passed and
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;; thing-at-point does not match a symbol and "*" + thing-at-point
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;; does not match a symbol (this is used to catch callbacks) and
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;; libxmldoc-filter-regexp is non-nil.
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;; Sat Jun 23 16:20:34 2001: update the docstrings
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;; Sat Jun 23 16:22:54 2001 (Geert Kloosterman <geertk@ai.rug.nl>):
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;; update README: use autoload instead of load+c-mode-hook
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;; Sat Jul 7 19:00:31 2001: fixed a problem with XEmacs: the
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;; string-match of XEmacs when used in completing-read used the
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;; minibuffer's value of case-fold-search, and not the one in the
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;; c-mode buffer that we had set => so there's a new *-string-match-cs
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;; (case sensitive) function which binds case-fold-search and runs string-match
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;; Wed Sep 1 20:26:29 2004: adapted for libxml2-2.6.9: handle
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;; document-relative (#XXX) links
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;;; TODO:
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;; - use command-execute for libxmldoc-browse-url
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;; - keep (match-string 1) in a variable (libxmldoc-get-list-of-symbols)
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;; (only if it improves performance)
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;; - check the (require ..)-statements
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;;; Code:
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(require 'browse-url)
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(require 'term)
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(defvar libxmldoc-root "~/src/libxml2-2.3.8/doc/html"
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"The root-directory of the libxml2-documentation (~ will be expanded).")
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(defvar libxmldoc-filter-regexp "^html\\|^\\*\\|^[A-Z_]+"
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"Symbols that match this regular expression will be excluded when doing
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completion and no symbol is specified.
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For example:
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callbacks: \"^\\\\*\"
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cpp-defines: \"[A-Z_]+\"
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xml-functions \"^xml\"
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html-functions \"^html\"
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sax-functions \".*SAX\"
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By default, callbacks, cpp-defines and html* are excluded.
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Set this to nil if you don't want filtering.")
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(defvar libxmldoc-browse-url 'browse-url-lynx-emacs
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"Browser used for browsing documentation. Emacs/W3 4.0pre46 cannot handle
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the html (and would be too slow), so lynx-emacs is used by default.")
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(defvar libxmldoc-symbol-history nil
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"History for looking up libxml-symbols.")
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(defvar libxmldoc-symbols nil
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"The list of libxml-symbols.")
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;;;; public functions
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(defun libxmldoc-lookup-symbol(&optional symbol)
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"Look up xml-symbol." (interactive)
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;; setting case-fold-search is now done in libxmldoc-string-match-cs
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;; Build up a symbol list if necessary
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(if (null libxmldoc-symbols)
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(setq libxmldoc-symbols (libxmldoc-get-list-of-symbols)))
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(cond
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(symbol ;; symbol is specified as argument
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(if (not (assoc symbol libxmldoc-symbols))
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(setq symbol nil)))
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((assoc (thing-at-point 'symbol) libxmldoc-symbols)
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(setq symbol (thing-at-point 'symbol)))
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;; this is needed to catch callbacks
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;; note: this could be rewritten to use (thing-at-point 'word)
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((assoc (concat "*" (thing-at-point 'symbol)) libxmldoc-symbols)
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(setq symbol (concat "*" (thing-at-point 'symbol))))
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)
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;; omit "" t) from call to completing-read for the sake of xemacs
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(setq symbol (completing-read
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"Libxml: " libxmldoc-symbols
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(if (or symbol (null libxmldoc-filter-regexp))
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nil
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'(lambda(key,value)
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(not (libxmldoc-string-match-cs libxmldoc-filter-regexp
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(car key,value)))))
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t symbol
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'libxmldoc-symbol-history))
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;; start browser
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(apply libxmldoc-browse-url
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(list (cdr (assoc symbol libxmldoc-symbols)))))
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;; (if (or symbol
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;; (null libxmldoc-filter-regexp))
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;; libxmldoc-symbols
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;; (mapcar
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;; '(lambda(key,value)
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;; (if (null (string-match
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;; libxmldoc-filter-regexp
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;; (car key,value)))
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;; key,value))
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;; libxmldoc-symbols))
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;;;; internal
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(defun libxmldoc-string-match-cs(regexp str)
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"This is needed because string-match in XEmacs uses the current-
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buffer's value of case-fold-search (different from GNU Emacs)."
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(let ((case-fold-search nil))
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(string-match regexp str)))
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(defun libxmldoc-get-list-of-symbols()
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"Get the list of html-links in the libxml-documentation."
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(let ((files
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(directory-files
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libxmldoc-root t
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(concat "^" (if (file-exists-p (concat libxmldoc-root
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"/libxml-parser.html"))
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"libxml-"
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"gnome-xml-")
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".*\\.html$") t))
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(symbols ())
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(case-fold-search t)
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(uri))
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(message "collecting libxml-symbols...")
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(while (car files)
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(message "processing %s" (car files))
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(with-temp-buffer
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(insert-file-contents (car files))
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(goto-char (point-min))
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(while (re-search-forward
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"<a[^>]*href[ \t\n]*=[ \t\n]*\"\\([^=>]*\\)\"[^>]*>" nil t nil)
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;; is it a relative link (#XXX)?
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(if (char-equal (elt (match-string 1) 0) ?#)
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(setq uri (concat "file://" (car files) (match-string 1)))
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(setq uri (concat "file://" (expand-file-name libxmldoc-root)
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"/" (match-string 1))))
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(if (not (re-search-forward "\\([^<]*\\)<" nil t nil))
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(error "regexp error while getting libxml-symbols.."))
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;; this needs add-to-list because i.e. xmlChar appears often
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(if (not (string-equal "" (match-string 1)))
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(add-to-list 'symbols (cons (match-string 1) uri))))
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;; (setq symbols (cons (cons (match-string 1) uri) symbols)))
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)
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(setq files (cdr files)))
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symbols))
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(provide 'libxmldoc)
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;;; libxml-doc.el ends here
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;;; Local Variables:
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;;; indent-tabs-mode: nil
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;;; End:
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