css_inherit.js

   1 /* $Id$
   2  * JavaScript helper for CSS 'subroutines'.
   3  * Copyright (C) 2005 Jan Kratochvil <project-www.jankratochvil.net@jankratochvil.net>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; exactly version 2 of June 1991 is required
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  */
  18
  19
  20 // Required CSS rule syntax: .PARENTNAME XXX[-lace-inherit="CHILDNAME"] { }
  21 // Be aware: CSS is case insensitive but HTML/XHTML is (sometimes?) sensitive.
  22 // Be aware: Works only on CSS directly applied by the "class" attribute!
  23 // TODO: Warns on invalid inheritance rules.
  24
  25 // Double-run protection due to the My::Web "text/javascript" compatibility hack.
  26 if (!window.var_My_css_inherit_done++) {
  27         var var_My_css_inherit_done=1;
  28
  29 var map;
  30
  31 function map_set(from,to)
  32 {
  33         if (!map)
  34                 map=new Array();
  35         if (!map[from])
  36                 map[from]=new Array();
  37         if (map[from][to])
  38                 return true;
  39         map[from][to]=true;
  40         return false;
  41 }
  42
  43 function css_inherit_node(node)
  44 {
  45         if (node.className) {
  46                 var classone_re=node.className.toLowerCase().match(/(\S+)/g);
  47                 for (var classonei in classone_re) {
  48                         var classone=classone_re[classonei];
  49                         if (!map || !map[classone])
  50                                 continue;
  51                         for (var target in map[classone])
  52                                 node.className+=" "+target;
  53                         }
  54                 }
  55         for (node=node.firstChild;node!=null;node=node.nextSibling)
  56                 css_inherit_node(node);
  57 }
  58
  59 function css_inherit()
  60 {
  61         if (document.styleSheets)
  62                 for (var stylei in document.styleSheets) {
  63                         var style=document.styleSheets[stylei];
  64                         if (!style.cssRules)
  65                                 continue;
  66                         for (var rulei in style.cssRules) {
  67                                 var rule=style.cssRules[rulei];
  68                                 if (!rule.selectorText)
  69                                         continue;
  70                                 var re;
  71                                 if (!(re=rule.selectorText.toLowerCase()
  72                                                 .match(/^\s*[.]([-\w]+).*\[\s*-lace-inherit\s*=\s*"?([^"]*)"?\s*\]\s*/)))
  73                                         continue;
  74                                 var from_string=re[1];
  75                                 var to_string=re[2];
  76                                 var to_re=to_string.match(/\S+/g);
  77                                 for (var to_rei in to_re) {
  78                                         var to_item=to_re[to_rei];
  79                                         map_set(from_string,to_item);
  80                                         }
  81                                 }
  82                         }
  83         var change;
  84         do {
  85                 change=false;
  86                 for (var from in map)
  87                         for (var to in map[from]) {
  88                                 if (!map[to])
  89                                         continue;
  90                                 for (var filler in map[to])
  91                                         if (!map_set(from,filler))
  92                                                 change=true;
  93                                 }
  94                 } while (change);
  95         /* Gecko: document.createNodeIterator(...)==NS_ERROR_NOT_IMPLEMENTED */
  96         css_inherit_node(document);
  97 }
  98
  99 /* Origin: http://simon.incutio.com/archive/2004/05/26/addLoadEvent */
 100 function addLoadEvent(func)
 101 {
 102         var onload_orig=window.onload;
 103         if (typeof(onload_orig)!='function')
 104                 window.onload = func;
 105         else
 106                 window.onload = function()
 107                 {
 108                         onload_orig();
 109                         func();
 110                 };
 111 }
 112
 113 addLoadEvent(css_inherit);
 114
 115 }