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CelerityResourceTransformer.php
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Sat, Mar 29, 03:56

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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