Package: cornerstone.cssvar
This is an implementation of aCSS Variablesextension for Zope Browser
Resources.Cascading Stylesheets don’t have any built in method to define variables and use
them within the stylesheet. This feature was discussed at some CSS related
blogs already and resulted in anon-official draft specification.In former Zope versions DTML templating language was used to define variables in
CSS. This breaks CSS syntax, looks crappy and produces error messages in
CSS-enabled editors even if the browser gets the correct values.cornerstone.cssvar uses an almost CSS syntax compatible variant to apply
variables:div.foo {
    color: var(myColor);
}If we declare such a css resource using zcml it looks this way:<browser:cssvarResource
  name="foo"
  file="foo.css"
/>If we use the common mechanism to declare variables using css like syntax we
must do this in a separate file, this looks like:@variables {
    myColor: #123456;
}The variable itself need to be defined by a namedICSSVariablesadapter on
request. We can register it by an own zcml directive:<browser:cssvarDefinition
  name="foodef"
  file="foodef.css"
/>Now we just need to tell our first css file which definition to use. Here
theres no common syntax, so we put it in an comment:/# vardef(foodef) /#
div.foo {
    color: var(myColor);
}If we now in browser look athttp://mydomain.tld/++resource++fooit results
in:/# vardef(foodef) /#
div.foo {
    color: #123456;
}For resource directories as defined byzope.app.publisherthe special CSS
handling is registered for every CSS file if this module is imported.This package is tested with Zope 3.5dev KGS (Python 2.6 )and in Zope 2.10.7
(with Plone 3.3 and Python 2.4).TODO:Write tests!Make resourceDirectory work in Plone.Profiling and performance testing.Copyrightwritten by Jens W. Klein -BlueDynamics Alliance- Klein & Partner KEG, AustriaLicenseCopyright (c) 2008-2009, BlueDynamics Alliance, Austria
All rights reserved.Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.Neither the name of the BlueDynamics Alliance nor the
names of its contributors may be used to endorse or promote products
derived from this software without specific prior written permission.THIS SOFTWARE IS PROVIDED BY BlueDynamics Alliance ‘’AS IS’’ AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL BlueDynamics Alliance BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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