gistfile1.aw

<?php
//ini_set('display_errors', 'On');
//error_reporting(E_ALL);

class Stylesheet {

	private $css_rule_regex = '/(?ims)([a-z0-9\s\.\:#_\-@]+)\{([^\}]*)\}/';
	
	public function __construct($css_data) {
		$this->unparsed = $css_data;
		$this->css_data = $css_data;
	}
	
	protected function parse() {
		preg_match_all($this->css_rule_regex, $this->css_data, $css_rules);
		$parsed_css = array();
		foreach($css_rules[0] as $key => $data) {
			$selector = trim($css_rules[1][$key]);
			$rules = explode(';', trim($css_rules[2][$key]));
			$parsed_css[$selector] = array();
			foreach($rules as $rule) {
				$rule = trim($rule);
				if(!empty($rule)) {					
					$_rule = array(
						trim(substr($rule, 0, strpos($rule, ':'))),
						trim(substr($rule, strpos($rule, ':')), ': ')
					);					
				$parsed_css[$selector][][$_rule[0]] = $_rule[1];
				}
			}
		}
	return $parsed_css;
	}
	
	public function parseReserved() {
		preg_match_all('~^(@[a-z0-9_\-]+)\s+([^\r\n]+)~im', $this->css_data, $constants, PREG_SET_ORDER);
		$parsed_css = $this->css_data;
		foreach($constants as $constant) {
			$const = $constant[1];
			$value = $constant[2];
			if($const[2] !== '{') {
				switch($const) {
					case '@url-base' :
						$value = trim($value, ';"\'');
						preg_match_all("/url\(['|\"](.*)['|\"]\)/i", $parsed_css, $matches);
						$values = $matches[1];
						
						foreach($values as $_value) {
							$url = (preg_match("/(http(s?):\/\/|ftp:\/\/{1})/i", $_value)) ? $_value : $value . $_value;
							$parsed_css = preg_replace("/(" . str_ireplace('/', '\/', $_value) . ")/", $url, $parsed_css);
						}
					break;
				}
			}
		}
	return $parsed_css;
	}
		
	protected function compile() {
		$parsed_css = $this->parse();
		$css_output = '';
		
		foreach($parsed_css as $css_selector => $css_rules) {
			if($css_selector !== '@variables') {
				$css_output .= "{$css_selector} {\n";
				foreach($css_rules as $offset => $rule) {
					$variables = array();
					foreach($parsed_css['@variables'] as $_variables) {
						foreach($_variables as $key => $value) {
							$variables[$key] = $value;
						}
					}
					foreach($rule as $property => $value) {
						preg_match('/var\((.*)\)/', $value, $match);						
						$css_output .= "\t{$property}: ";
						$css_output .= preg_replace('/var\(' . $match[1] . '\)/', $variables[$match[1]], $value);
						$css_output .= ";\n";
					}
				}
				$css_output .= "}\n\n";
			}
		}
	return $css_output;
	}
	
	public function getCompiled() {
		return $this->compile();
	}
	
	public function getCompressed() {
		$css_output = $this->compile();
		$css_output = str_replace(array("\r\n", "\r", "\n", "\t", '  '), ' ', $css_output);
	return $css_output;
	}

	public function __tostring() {
		$this->css_data = $this->parseReserved();
		$this->css_data = $this->getCompiled();
	return $this->css_data;
	}

}






$stylesheet = new Stylesheet('
@url-base "../";

@variables {
	foo: bold 12px arial, helvetica, sans-serif;
	bar: red;
	baz: yellow;
}

body {
	font: var(foo);
	color: var(bar);
}

');


echo '<pre>';
//echo $stylesheet->parseReserved();
echo $stylesheet;
echo '</pre>';
?>