CelerityResourceTransformer.php
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	<?php

	/*
	* Copyright 2012 Facebook, Inc.
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	/**
	* @group celerity
	*/
	final class CelerityResourceTransformer {

	private $minify;
	private $rawResourceMap;
	private $celerityMap;

	public function setMinify($minify) {
	$this->minify = $minify;
	return $this;
	}

	public function setRawResourceMap(array $raw_resource_map) {
	$this->rawResourceMap = $raw_resource_map;
	return $this;
	}

	public function setCelerityMap(CelerityResourceMap $celerity_map) {
	$this->celerityMap = $celerity_map;
	return $this;
	}

	public function transformResource($path, $data) {
	$type = self::getResourceType($path);

	switch ($type) {
	case 'css':
	$data = preg_replace_callback(
	'@url\s$(\s[\'"]?/rsrc/.*?)$@s',
	array($this, 'translateResourceURI'),
	$data);
	break;
	}

	if (!$this->minify) {
	return $data;
	}

	// Some resources won't survive minification (like Raphael.js), and are
	// marked so as not to be minified.
	if (strpos($data, '@'.'do-not-minify') !== false) {
	return $data;
	}

	switch ($type) {
	case 'css':
	// Remove comments.
	$data = preg_replace('@/\.?\*/@s', '', $data);
	// Remove whitespace around symbols.
	$data = preg_replace('@\s([{}:;,])\s@', '\1', $data);
	// Remove unnecessary semicolons.
	$data = preg_replace('@;}@', '}', $data);
	// Replace #rrggbb with #rgb when possible.
	$data = preg_replace(
	'@#([a-f0-9])\1([a-f0-9])\2([a-f0-9])\3@i',
	'#\1\2\3',
	$data);
	$data = trim($data);
	break;
	case 'js':
	$root = dirname(phutil_get_library_root('phabricator'));
	$bin = $root.'/externals/javelin/support/jsxmin/jsxmin';

	if (@file_exists($bin)) {
	$future = new ExecFuture("{$bin} __DEV__:0");
	$future->write($data);
	list($err, $result) = $future->resolve();
	if (!$err) {
	$data = $result;
	}
	}
	break;
	}

	return $data;
	}

	public static function getResourceType($path) {
	return last(explode('.', $path));
	}

	public function translateResourceURI(array $matches) {
	$uri = trim($matches[1], "'\" \r\t\n");

	if ($this->rawResourceMap) {
	if (isset($this->rawResourceMap[$uri]['uri'])) {
	$uri = $this->rawResourceMap[$uri]['uri'];
	}
	} else if ($this->celerityMap) {
	$info = $this->celerityMap->lookupFileInformation($uri);
	if ($info) {
	$uri = $info['uri'];
	}
	}

	return 'url('.$uri.')';
	}

	}

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