Symfony2CssRewriteFilter

Symfony2CssRewriteFilter.php

<?php
namespace Clever\Presenter\CoreBundle\Assetic\Filter;


use Assetic\Filter\BaseCssFilter;
use Assetic\Asset\AssetInterface;

/**
 * Fixes relative CSS urls.
 * Support of Symfony relative bundles url
 *
 * @author Kris Wallsmith <kris.wallsmith@gmail.com>
 * @author William POTTIER <wpottier@allprogrammic.com>
 */
class Symfony2CssRewriteFilter extends BaseCssFilter
{
    public function filterLoad(AssetInterface $asset)
    {
    }

    public function filterDump(AssetInterface $asset)
    {
        $sourceBase = $asset->getSourceRoot();
        $sourcePath = $asset->getSourcePath();
        $targetPath = $asset->getTargetPath();

        if (null === $sourcePath || null === $targetPath || $sourcePath == $targetPath) {
            return;
        }

        // learn how to get from the target back to the source
        if (false !== strpos($sourceBase, '://')) {
            list($scheme, $url) = explode('://', $sourceBase.'/'.$sourcePath, 2);
            list($host, $path) = explode('/', $url, 2);

            $host = $scheme.'://'.$host.'/';
            $path = false === strpos($path, '/') ? '' : dirname($path);
            $path .= '/';
        } else {
            // assume source and target are on the same host
            $host = '';

            // pop entries off the target until it fits in the source
            if ('.' == dirname($sourcePath)) {
                $path = str_repeat('../', substr_count($targetPath, '/'));
            } elseif ('.' == $targetDir = dirname($targetPath)) {
                $path = dirname($sourcePath).'/';
            } else {
                $path = '';
                while (0 !== strpos($sourcePath, $targetDir)) {
                    if (false !== $pos = strrpos($targetDir, '/')) {
                        $targetDir = substr($targetDir, 0, $pos);
                        $path .= '../';
                    } else {
                        $targetDir = '';
                        $path .= '../';
                        break;
                    }
                }
                $path .= ltrim(substr(dirname($sourcePath).'/', strlen($targetDir)), '/');
            }
        }

        $content = $this->filterReferences($asset->getContent(), function($matches) use($host, $path, $sourceBase, $sourcePath)
        {

            if (false !== strpos($matches['url'], '://') || 0 === strpos($matches['url'], '//') || 0 === strpos($matches['url'], 'data:')) {
                // absolute or protocol-relative or data uri
                return $matches[0];
            }

            if ('/' == $matches['url'][0]) {
                // root relative
                return str_replace($matches['url'], $host.$matches['url'], $matches[0]);
            }

            // document relative
            $url = $matches['url'];
            while (0 === strpos($url, '../') && 2 <= substr_count($path, '/')) {
                $path = substr($path, 0, strrpos(rtrim($path, '/'), '/') + 1);
                $url = substr($url, 3);
            }

            $result = str_replace($matches['url'], $host.$path.$url, $matches[0]);

            // Symfony Bundle
            if(strpos($sourceBase, 'Bundle') !== false && strpos($sourcePath, 'Resources/') === 0) {
                preg_match('/(src|vendor)\/([a-zA-Z\/]+)Bundle/', $sourceBase, $bundleMatches);
                $bundleName = strtolower(str_replace('/', '', $bundleMatches[2]));

                preg_match('/Resources\/([a-zA-Z]+)\//', $sourcePath, $pathMatches);

                $result = str_replace('Resources/'.$pathMatches[1], sprintf('bundles/%s', $bundleName), $result);
            }

            return $result;
        });

        $asset->setContent($content);
    }
}