<?php

namespace Assetic\Filter;

/**
 * An abstract filter for dealing with CSS.
 *
 * @author Kris Wallsmith <kris.wallsmith@gmail.com>
 */
abstract class BaseCssFilter implements FilterInterface
{
	/**
	 * Filters all references -- url() and "@import" -- through a callable.
	 *
	 * @param string $content  The CSS
	 * @param mixed  $callback A PHP callable
	 *
	 * @return string The filtered CSS
	 */
	protected function filterReferences($content, $callback, $limit = -1, &$count = 0)
	{
		$content = $this->filterUrls($content, $callback, $limit, $count);
		$content = $this->filterImports($content, $callback, $limit, $count, false);

		return $content;
	}


	/**
	 * Filters all CSS url()'s through a callable.
	 *
	 * @param string  $content  The CSS
	 * @param mixed   $callback A PHP callable
	 * @param integer $limit    Limit the number of replacements
	 * @param integer $count    Will be populated with the count
	 *
	 * @return string The filtered CSS
	 */
	protected function filterUrls($content, $callback, $limit = -1, &$count = 0)
	{
		return preg_replace_callback('/url\((["\']?)(?<url>.*?)(\\1)\)/', $callback, $content, $limit, $count);
	}


	/**
	 * Filters all CSS imports through a callable.
	 *
	 * @param string  $content    The CSS
	 * @param mixed   $callback   A PHP callable
	 * @param integer $limit      Limit the number of replacements
	 * @param integer $count      Will be populated with the count
	 * @param Boolean $includeUrl Whether to include url() in the pattern
	 *
	 * @return string The filtered CSS
	 */
	protected function filterImports($content, $callback, $limit = -1, &$count = 0, $includeUrl = true)
	{
		$pattern = $includeUrl
		    ? '/@import (?:url\()?(\'|"|)(?<url>[^\'"\)\n\r]*)\1\)?;?/'
		    : '/@import (?!url\()(\'|"|)(?<url>[^\'"\)\n\r]*)\1;?/';

		return preg_replace_callback($pattern, $callback, $content, $limit, $count);
	}
}
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