function parseCss()
{
$this->css = $this->stripComments($this->css);
$this->substituteIncludes();
$this->substituteVars();
$this->buildUrls();
$matches = array();
preg_match_all('/([^{]*)\\s*{([^}]+)(?:\\s+)?}(?:\\s+)?/', $this->css, $matches);
$this->selectors = array();
for ($i = 0; $i < count($matches[0]); ++$i) {
$selector = new CssSelector($matches[0][$i]);
if (isset($this->selectors[$selector->selector])) {
$selector->inherit($this->selectors[$selector->selector]);
}
$this->selectors[$selector->selector] = $selector;
}
foreach ($this->selectors as $selector) {
if ($selector->hasSuper()) {
$super = $this->selectors[$selector->super];
$selector->inherit($super);
}
}
}
