<?php

/**

 * This {@link aCssMinifierPlugin} will process var-statement and sets the declaration value to the variable value. 

 * 

 * This plugin only apply the variable values. The variable values itself will get parsed by the

 * {@link CssVariablesMinifierFilter}.

 * 

 * Example:

 * <code>

 * @variables

 * 		{

 * 		defaultColor: black;

 * 		}

 * color: var(defaultColor);

 * </code>

 * 

 * Will get converted to:

 * <code>

 * color:black;

 * </code>

 *

 * @package		CssMin/Minifier/Plugins

 * @link		http://code.google.com/p/cssmin/

 * @author		Joe Scylla <joe.scylla@gmail.com>

 * @copyright	2008 - 2011 Joe Scylla <joe.scylla@gmail.com>

 * @license		http://opensource.org/licenses/mit-license.php MIT License

 * @version		3.0.1

 */

class CssVariablesMinifierPlugin extends aCssMinifierPlugin

	{

	/**

	 * Regular expression matching a value.

	 * 

	 * @var string

	 */

	private $reMatch = "/var\((.+)\)/iSU";

	/**

	 * Parsed variables.

	 * 

	 * @var array

	 */

	private $variables = null;

	/**

	 * Returns the variables.

	 * 

	 * @return array

	 */

	public function getVariables()

		{

		return $this->variables;

		}

	/**

	 * Implements {@link aCssMinifierPlugin::minify()}.

	 * 

	 * @param aCssToken $token Token to process

	 * @return boolean Return TRUE to break the processing of this token; FALSE to continue

	 */

	public function apply(aCssToken &$token)

		{

		if (stripos($token->Value, "var") !== false && preg_match_all($this->reMatch, $token->Value, $m))

			{

			$mediaTypes	= $token->MediaTypes;

			if (!in_array("all", $mediaTypes))

				{

				$mediaTypes[] = "all";

				}

			for ($i = 0, $l = count($m[0]); $i < $l; $i++)

				{

				$variable	= trim($m[1][$i]);

				foreach ($mediaTypes as $mediaType)

					{

					if (isset($this->variables[$mediaType], $this->variables[$mediaType][$variable]))

						{

						// Variable value found => set the declaration value to the variable value and return

						$token->Value = str_replace($m[0][$i], $this->variables[$mediaType][$variable], $token->Value);

						continue 2;

						}

					}

				// If no value was found trigger an error and replace the token with a CssNullToken

				CssMin::triggerError(new CssError(__FILE__, __LINE__, __METHOD__ . ": No value found for variable <code>" . $variable . "</code> in media types <code>" . implode(", ", $mediaTypes) . "</code>", (string) $token));

				$token = new CssNullToken();

				return true;

				}

			}

		return false;

		}

	/**

	 * Implements {@link aMinifierPlugin::getTriggerTokens()}

	 * 

	 * @return array

	 */

	public function getTriggerTokens()

		{

		return array

			(

			"CssAtFontFaceDeclarationToken",

			"CssAtPageDeclarationToken",

			"CssRulesetDeclarationToken"

			);

		}

	/**

	 * Sets the variables.

	 * 

	 * @param array $variables Variables to set

	 * @return void

	 */

	public function setVariables(array $variables)

		{

		$this->variables = $variables;

		}

	}

?>