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CelerityResourceTransformer.php
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Wed, Dec 25, 10:24

CelerityResourceTransformer.php
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<?php
final class CelerityResourceTransformer extends Phobject {
private $minify;
private $rawURIMap;
private $celerityMap;
private $translateURICallback;
private $currentPath;
private $postprocessorKey;
private $variableMap;
public function setPostprocessorKey($postprocessor_key) {
$this->postprocessorKey = $postprocessor_key;
return $this;
}
public function getPostprocessorKey() {
return $this->postprocessorKey;
}
public function setTranslateURICallback($translate_uricallback) {
$this->translateURICallback = $translate_uricallback;
return $this;
}
public function setMinify($minify) {
$this->minify = $minify;
return $this;
}
public function setCelerityMap(CelerityResourceMap $celerity_map) {
$this->celerityMap = $celerity_map;
return $this;
}
public function setRawURIMap(array $raw_urimap) {
$this->rawURIMap = $raw_urimap;
return $this;
}
public function getRawURIMap() {
return $this->rawURIMap;
}
/**
* @phutil-external-symbol function jsShrink
*/
public function transformResource($path, $data) {
$type = self::getResourceType($path);
switch ($type) {
case 'css':
$data = $this->replaceCSSPrintRules($path, $data);
$data = $this->replaceCSSVariables($path, $data);
$data = preg_replace_callback(
'@url\s*\((\s*[\'"]?.*?)\)@s',
nonempty(
$this->translateURICallback,
array($this, 'translateResourceURI')),
$data);
break;
}
if (!$this->minify) {
return $data;
}
// Some resources won't survive minification (like d3.min.js), and are
// marked so as not to be minified.
if (strpos($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':
// If `jsxmin` is available, use it. jsxmin is the Javelin minifier and
// produces the smallest output, but is complicated to build.
if (Filesystem::binaryExists('jsxmin')) {
$future = new ExecFuture('jsxmin __DEV__:0');
$future->write($data);
list($err, $result) = $future->resolve();
if (!$err) {
$data = $result;
break;
}
}
// If `jsxmin` is not available, use `JsShrink`, which doesn't compress
// quite as well but is always available.
$root = dirname(phutil_get_library_root('phabricator'));
require_once $root.'/externals/JsShrink/jsShrink.php';
$data = jsShrink($data);
break;
}
return $data;
}
public static function getResourceType($path) {
return last(explode('.', $path));
}
public function translateResourceURI(array $matches) {
$uri = trim($matches[1], "'\" \r\t\n");
$tail = '';
// If the resource URI has a query string or anchor, strip it off before
// we go looking for the resource. We'll stitch it back on later. This
// primarily affects FontAwesome.
$parts = preg_split('/(?=[?#])/', $uri, 2);
if (count($parts) == 2) {
$uri = $parts[0];
$tail = $parts[1];
}
$alternatives = array_unique(
array(
$uri,
ltrim($uri, '/'),
));
foreach ($alternatives as $alternative) {
if ($this->rawURIMap !== null) {
if (isset($this->rawURIMap[$alternative])) {
$uri = $this->rawURIMap[$alternative];
break;
}
}
if ($this->celerityMap) {
$resource_uri = $this->celerityMap->getURIForName($alternative);
if ($resource_uri) {
// Check if we can use a data URI for this resource. If not, just
// use a normal Celerity URI.
$data_uri = $this->generateDataURI($alternative);
if ($data_uri) {
$uri = $data_uri;
} else {
$uri = $resource_uri;
}
break;
}
}
}
return 'url('.$uri.$tail.')';
}
private function replaceCSSVariables($path, $data) {
$this->currentPath = $path;
return preg_replace_callback(
'/{\$([^}]+)}/',
array($this, 'replaceCSSVariable'),
$data);
}
private function replaceCSSPrintRules($path, $data) {
$this->currentPath = $path;
return preg_replace_callback(
'/!print\s+(.+?{.+?})/s',
array($this, 'replaceCSSPrintRule'),
$data);
}
public function getCSSVariableMap() {
$postprocessor_key = $this->getPostprocessorKey();
$postprocessor = CelerityPostprocessor::getPostprocessor(
$postprocessor_key);
if (!$postprocessor) {
$postprocessor = CelerityPostprocessor::getPostprocessor(
CelerityDefaultPostprocessor::POSTPROCESSOR_KEY);
}
return $postprocessor->getVariables();
}
public function replaceCSSVariable($matches) {
if (!$this->variableMap) {
$this->variableMap = $this->getCSSVariableMap();
}
$var_name = $matches[1];
if (empty($this->variableMap[$var_name])) {
$path = $this->currentPath;
throw new Exception(
pht(
"CSS file '%s' has unknown variable '%s'.",
$path,
$var_name));
}
return $this->variableMap[$var_name];
}
public function replaceCSSPrintRule($matches) {
$rule = $matches[1];
$rules = array();
$rules[] = '.printable '.$rule;
$rules[] = "@media print {\n ".str_replace("\n", "\n ", $rule)."\n}\n";
return implode("\n\n", $rules);
}
/**
* Attempt to generate a data URI for a resource. We'll generate a data URI
* if the resource is a valid resource of an appropriate type, and is
* small enough. Otherwise, this method will return `null` and we'll end up
* using a normal URI instead.
*
* @param string Resource name to attempt to generate a data URI for.
* @return string|null Data URI, or null if we declined to generate one.
*/
private function generateDataURI($resource_name) {
$ext = last(explode('.', $resource_name));
switch ($ext) {
case 'png':
$type = 'image/png';
break;
case 'gif':
$type = 'image/gif';
break;
case 'jpg':
$type = 'image/jpeg';
break;
default:
return null;
}
// In IE8, 32KB is the maximum supported URI length.
$maximum_data_size = (1024 * 32);
$data = $this->celerityMap->getResourceDataForName($resource_name);
if (strlen($data) >= $maximum_data_size) {
// If the data is already too large on its own, just bail before
// encoding it.
return null;
}
$uri = 'data:'.$type.';base64,'.base64_encode($data);
if (strlen($uri) >= $maximum_data_size) {
return null;
}
return $uri;
}
}

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