115 lines
2.8 KiB
PHP
115 lines
2.8 KiB
PHP
<?php
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/*
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* This file is part of the Assetic package, an OpenSky project.
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*
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* (c) 2010-2012 OpenSky Project Inc
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Assetic\Filter;
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use Assetic\Asset\AssetInterface;
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use Assetic\Exception\FilterException;
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use Symfony\Component\Process\ProcessBuilder;
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/**
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* Loads LESS files.
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*
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* @link http://lesscss.org/
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* @author Kris Wallsmith <kris.wallsmith@gmail.com>
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*/
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class LessFilter implements FilterInterface
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{
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private $nodeBin;
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private $nodePaths;
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private $compress;
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/**
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* Constructor.
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*
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* @param string $nodeBin The path to the node binary
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* @param array $nodePaths An array of node paths
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*/
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public function __construct($nodeBin = '/usr/bin/node', array $nodePaths = array())
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{
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$this->nodeBin = $nodeBin;
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$this->nodePaths = $nodePaths;
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}
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public function setCompress($compress)
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{
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$this->compress = $compress;
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}
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public function filterLoad(AssetInterface $asset)
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{
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static $format = <<<'EOF'
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var less = require('less');
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var sys = require(process.binding('natives').util ? 'util' : 'sys');
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new(less.Parser)(%s).parse(%s, function(e, tree) {
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if (e) {
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less.writeError(e);
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process.exit(2);
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}
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try {
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sys.print(tree.toCSS(%s));
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} catch (e) {
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less.writeError(e);
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process.exit(3);
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}
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});
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EOF;
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$root = $asset->getSourceRoot();
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$path = $asset->getSourcePath();
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// parser options
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$parserOptions = array();
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if ($root && $path) {
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$parserOptions['paths'] = array(dirname($root.'/'.$path));
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$parserOptions['filename'] = basename($path);
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}
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// tree options
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$treeOptions = array();
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if (null !== $this->compress) {
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$treeOptions['compress'] = $this->compress;
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}
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$pb = new ProcessBuilder();
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$pb->inheritEnvironmentVariables();
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// node.js configuration
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if (0 < count($this->nodePaths)) {
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$pb->setEnv('NODE_PATH', implode(':', $this->nodePaths));
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}
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$pb->add($this->nodeBin)->add($input = tempnam(sys_get_temp_dir(), 'assetic_less'));
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file_put_contents($input, sprintf($format,
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json_encode($parserOptions),
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json_encode($asset->getContent()),
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json_encode($treeOptions)
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));
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$proc = $pb->getProcess();
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$code = $proc->run();
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unlink($input);
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if (0 < $code) {
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throw FilterException::fromProcess($proc)->setInput($asset->getContent());
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}
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$asset->setContent($proc->getOutput());
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}
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public function filterDump(AssetInterface $asset)
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{
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}
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}
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