lisp/muse-regexps.el

   1 ;;; muse-regexps.el --- define regexps used by Muse
   2
   3 ;; Copyright (C) 2004, 2005, 2006 Free Software Foundation, Inc.
   4
   5 ;; This file is part of Emacs Muse.  It is not part of GNU Emacs.
   6
   7 ;; Emacs Muse is free software; you can redistribute it and/or modify
   8 ;; it under the terms of the GNU General Public License as published
   9 ;; by the Free Software Foundation; either version 2, or (at your
  10 ;; option) any later version.
  11
  12 ;; Emacs Muse is distributed in the hope that it will be useful, but
  13 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
  14 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15 ;; General Public License for more details.
  16
  17 ;; You should have received a copy of the GNU General Public License
  18 ;; along with Emacs Muse; see the file COPYING.  If not, write to the
  19 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20 ;; Boston, MA 02110-1301, USA.
  21
  22 ;;; Commentary:
  23
  24 ;; This file is the part of the Muse project that describes regexps
  25 ;; that are used throughout the project.
  26
  27 ;;; Contributors:
  28
  29 ;;; Code:
  30
  31 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  32 ;;
  33 ;; Muse Regular Expressions
  34 ;;
  35 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  36
  37 (defgroup muse-regexp nil
  38   "Regular expressions used in publishing and syntax highlighting."
  39   :group 'muse)
  40
  41 (defcustom muse-regexp-use-character-classes 'undecided
  42   "Indicate whether to use extended character classes like [:space:].
  43 If 'undecided, Muse will use them if your emacs is known to support them.
  44
  45 Emacs 22 and Emacs 21.3.50 are known to support them.  XEmacs
  46 does not support them.
  47
  48 Emacs 21.2 or higher support them, but with enough annoying edge
  49 cases that the sanest default is to leave them disabled."
  50   :type '(choice (const :tag "Yes" t)
  51                  (const :tag "No" nil)
  52                  (const :tag "Let Muse decide" undecided))
  53   :group 'muse-regexp)
  54
  55 (defvar muse-regexp-emacs-revision
  56   (save-match-data
  57     (and (string-match "^[0-9]+\\.[0-9]+\\.\\([0-9]+\\)"
  58                        emacs-version)
  59          (match-string 1 emacs-version)
  60          (string-to-number (match-string 1 emacs-version))))
  61   "The revision number of this version of Emacs.")
  62
  63 (defun muse-extreg-usable-p ()
  64   "Return non-nil if extended character classes can be used,
  65 nil otherwise.
  66
  67 This is used when deciding the initial values of the muse-regexp
  68 options."
  69   (cond
  70    ((eq muse-regexp-use-character-classes t)
  71     t)
  72    ((eq muse-regexp-use-character-classes nil)
  73     nil)
  74    ((featurep 'xemacs) nil)             ; unusable on XEmacs
  75    ((> emacs-major-version 21) t)       ; usable if > 21
  76    ((< emacs-major-version 21) nil)
  77    ((< emacs-minor-version 3) nil)
  78    ;; don't use if version is of format 21.x
  79    ((null muse-regexp-emacs-revision) nil)
  80    ;; only trust 21.3.50 or higher
  81    ((>= muse-regexp-emacs-revision 50) t)
  82    (t nil)))
  83
  84 (defcustom muse-regexp-blank
  85   (if (muse-extreg-usable-p)
  86       "[:blank:]"
  87     " \t")
  88   "Regexp to use in place of \"[:blank:]\".
  89 This should be something that matches spaces and tabs.
  90
  91 It is like a regexp, but should be embeddable inside brackets.
  92 Muse will detect the appropriate value correctly most of
  93 the time."
  94   :type 'string
  95   :options '("[:blank:]" " \t")
  96   :group 'muse-regexp)
  97
  98 (defcustom muse-regexp-alnum
  99   (if (muse-extreg-usable-p)
 100       "[:alnum:]"
 101     "A-Za-z0-9")
 102   "Regexp to use in place of \"[:alnum:]\".
 103 This should be something that matches all letters and numbers.
 104
 105 It is like a regexp, but should be embeddable inside brackets.
 106 muse will detect the appropriate value correctly most of
 107 the time."
 108   :type 'string
 109   :options '("[:alnum:]" "A-Za-z0-9")
 110   :group 'muse-regexp)
 111
 112 (defcustom muse-regexp-lower
 113   (if (muse-extreg-usable-p)
 114       "[:lower:]"
 115     "a-z")
 116   "Regexp to use in place of \"[:lower:]\".
 117 This should match all lowercase characters.
 118
 119 It is like a regexp, but should be embeddable inside brackets.
 120 muse will detect the appropriate value correctly most of
 121 the time."
 122   :type 'string
 123   :options '("[:lower:]" "a-z")
 124   :group 'muse-regexp)
 125
 126 (defcustom muse-regexp-upper
 127   (if (muse-extreg-usable-p)
 128       "[:upper:]"
 129     "A-Z")
 130   "Regexp to use in place of \"[:upper:]\".
 131 This should match all uppercase characters.
 132
 133 It is like a regexp, but should be embeddable inside brackets.
 134 muse will detect the appropriate value correctly most of
 135 the time."
 136   :type 'string
 137   :options '("[:upper:]" "A-Z")
 138   :group 'muse-regexp)
 139
 140 (defcustom muse-tag-regexp
 141   (concat "<\\([^/\n" muse-regexp-blank "][^\n" muse-regexp-blank
 142           "</>]*\\)\\(\\s-+[^<>]+[^</>]\\)?\\(/\\)?>")
 143   "A regexp used to find XML-style tags within a buffer when publishing.
 144 Group 1 should be the tag name, group 2 the properties, and group
 145 3 the optional immediate ending slash."
 146   :type 'regexp
 147   :group 'muse-regexp)
 148
 149 (defcustom muse-explicit-link-regexp
 150   "\\[\\[\\([^][\t\n]+\\)\\]\\(?:\\[\\([^][\n]+\\)\\]\\)?\\]"
 151   "Regexp used to match [[target][description]] links.
 152 Paren group 1 must match the URL, and paren group 2 the description."
 153   :type 'regexp
 154   :group 'muse-regexp)
 155
 156 (defcustom muse-implicit-link-regexp
 157   (concat "\\([^" muse-regexp-blank "\n]+\\)")
 158   "Regexp used to match an implicit link.
 159 An implicit link is the largest block of text to be checked for
 160 URLs and bare WikiNames by the `muse-link-at-point' function.
 161 Paren group 1 is the text to be checked.
 162
 163 URLs are checked by default.  To get WikiNames, load
 164 muse-wiki.el.
 165
 166 If you want to match things with spaces in them, you will have to
 167 modify this."
 168   :type 'regexp
 169   :group 'muse-regexp)
 170
 171 (defcustom muse-file-regexp
 172   "[/?]\\|\\.\\(html?\\|pdf\\|mp3\\|el\\|zip\\|txt\\|tar\\)\\(\\.\\(gz\\|bz2\\)\\)?\\'"
 173   "A link matching this regexp will be regarded as a link to a file."
 174   :type 'regexp
 175   :group 'muse-regexp)
 176
 177 (defcustom muse-image-regexp
 178   "\\.\\(eps\\|gif\\|jp\\(e?g\\)\\|p\\(bm\\|ng\\)\\|tiff\\|x\\([bp]m\\)\\)\\'"
 179   "A link matching this regexp will be published inline as an image.
 180 For example:
 181
 182   [[./wife.jpg][A picture of my wife]]
 183
 184 If you omit the description, the alt tag of the resulting HTML
 185 buffer will be the name of the file."
 186   :type 'regexp
 187   :group 'muse-regexp)
 188
 189 (provide 'muse-regexps)
 190
 191 ;;; muse-regexps.el ends here