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 var map;
  26
  27 function map_set(from,to)
  28 {
  29         if (!map)
  30                 map=new Array();
  31         if (!map[from])
  32                 map[from]=new Array();
  33         if (map[from][to])
  34                 return true;
  35         map[from][to]=true;
  36         return false;
  37 }
  38
  39 function css_inherit_node(node)
  40 {
  41         if (node.className) {
  42                 var classone_re=node.className.toLowerCase().match(/(\S+)/g);
  43                 for (var classonei in classone_re) {
  44                         var classone=classone_re[classonei];
  45                         if (!map || !map[classone])
  46                                 continue;
  47                         for (var target in map[classone])
  48                                 node.className+=" "+target;
  49                         }
  50                 }
  51         for (node=node.firstChild;node!=null;node=node.nextSibling)
  52                 css_inherit_node(node);
  53 }
  54
  55 function css_inherit()
  56 {
  57         if (document.styleSheets)
  58                 for (var stylei in document.styleSheets) {
  59                         var style=document.styleSheets[stylei];
  60                         if (!style.cssRules)
  61                                 continue;
  62                         for (var rulei in style.cssRules) {
  63                                 var rule=style.cssRules[rulei];
  64                                 if (!rule.selectorText)
  65                                         continue;
  66                                 var re;
  67                                 if (!(re=rule.selectorText.toLowerCase()
  68                                                 .match(/^\s*[.](\w+).*\[\s*-lace-inherit\s*=\s*"?([^"]*)"?\s*\]\s*/)))
  69                                         continue;
  70                                 var from_string=re[1];
  71                                 var to_string=re[2];
  72                                 var to_re=to_string.match(/\S+/g);
  73                                 for (var to_rei in to_re) {
  74                                         var to_item=to_re[to_rei];
  75                                         map_set(from_string,to_item);
  76                                         }
  77                                 }
  78                         }
  79         var change;
  80         do {
  81                 change=false;
  82                 for (var from in map)
  83                         for (var to in map[from]) {
  84                                 if (!map[to])
  85                                         continue;
  86                                 for (var filler in map[to])
  87                                         if (!map_set(from,filler))
  88                                                 change=true;
  89                                 }
  90                 } while (change);
  91         /* Gecko: document.createNodeIterator(...)==NS_ERROR_NOT_IMPLEMENTED */
  92         css_inherit_node(document);
  93 }
  94
  95 /* Origin: http://simon.incutio.com/archive/2004/05/26/addLoadEvent */
  96 function addLoadEvent(func)
  97 {
  98         var onload_orig=window.onload;
  99         if (typeof(onload_orig)!='function')
 100                 window.onload = func;
 101         else
 102                 window.onload = function()
 103                 {
 104                         onload_orig();
 105                         func();
 106                 };
 107 }
 108
 109 addLoadEvent(css_inherit);