1<?php
2
3/*
4 * This file is part of the Assetic package, an OpenSky project.
5 *
6 * (c) 2010-2013 OpenSky Project Inc
7 *
8 * For the full copyright and license information, please view the LICENSE
9 * file that was distributed with this source code.
10 */
11
12namespace Assetic\Filter;
13
14use Assetic\Asset\AssetInterface;
15use Assetic\Exception\FilterException;
16use Assetic\Util\FilesystemUtils;
17
18/**
19 * Parses CSS and adds vendor prefixes to rules using values from the Can I Use website
20 *
21 * @link https://github.com/ai/autoprefixer
22 * @author Alex Vasilenko <aa.vasilenko@gmail.com>
23 */
24class AutoprefixerFilter extends BaseNodeFilter
25{
26    /**
27     * @var string
28     */
29    private $autoprefixerBin;
30
31    /**
32     * @var array
33     */
34    private $browsers = array();
35
36    public function __construct($autoprefixerBin)
37    {
38        $this->autoprefixerBin = $autoprefixerBin;
39    }
40
41    /**
42     * @param array $browsers
43     */
44    public function setBrowsers(array $browsers)
45    {
46        $this->browsers = $browsers;
47    }
48
49    /**
50     * @param string $browser
51     */
52    public function addBrowser($browser)
53    {
54        $this->browsers[] = $browser;
55    }
56
57    public function filterLoad(AssetInterface $asset)
58    {
59        $input = $asset->getContent();
60        $pb = $this->createProcessBuilder(array($this->autoprefixerBin));
61
62        $pb->setInput($input);
63        if ($this->browsers) {
64            $pb->add('-b')->add(implode(',', $this->browsers));
65        }
66
67        $output = FilesystemUtils::createTemporaryFile('autoprefixer');
68        $pb->add('-o')->add($output);
69
70        $proc = $pb->getProcess();
71        if (0 !== $proc->run()) {
72            throw FilterException::fromProcess($proc)->setInput($asset->getContent());
73        }
74
75        $asset->setContent(file_get_contents($output));
76        unlink($output);
77    }
78
79    /**
80     * Filters an asset just before it's dumped.
81     *
82     * @param AssetInterface $asset An asset
83     */
84    public function filterDump(AssetInterface $asset)
85    {
86    }
87}
88