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php-closure.php
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php-closure.php
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<?php
/**
* Copyright 2010 Daniel Pupius (http://code.google.com/p/php-closure/)
*
* 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.
*/
/**
* PHP wrapper for the Google Closure JS Compiler web service.
*
* Handles caching and recompilation of sources. A recompilation will occur
* whenever a source file, or the script calling the compiler, changes.
*
* The class will handle the Last-Modified and 304 redirects for you, but if
* you should set Cache-Control headers appropriate for your needs.
*
* Example usage:
*
* include("php-closure.php");
*
* $c = new PhpClosure();
* $c->add("my-app.js")
* ->add("popup.js")
* ->advancedMode()
* ->useClosureLibrary()
* ->cacheDir("/tmp/js-cache/")
* ->write();
*
* See http://code.google.com/closure/compiler/docs/api-ref.html for more
* details on the compiler options.
*/
class PhpClosure {
var $_srcs = array();
var $_mode = "WHITESPACE_ONLY";
var $_warning_level = "DEFAULT";
var $_use_closure_library = false;
var $_pretty_print = false;
var $_debug = true;
var $_cache_dir = "";
var $_code_url_prefix = "";
function PhpClosure() { }
/**
* Adds a source file to the list of files to compile. Files will be
* concatenated in the order they are added.
*/
function add($file) {
$this->_srcs[] = $file;
return $this;
}
/**
* Sets the directory where the compilation results should be cached, if
* not set then caching will be disabled and the compiler will be invoked
* for every request (NOTE: this will hit ratelimits pretty fast!)
*/
function cacheDir($dir) {
$this->_cache_dir = $dir;
return $this;
}
/**
* Sets whether to use the Closure Library. i.e. goog.requires will be
* resolved and the library code made available.
*/
function useClosureLibrary() {
$this->_use_closure_library = true;
return $this;
}
/**
* Sets the URL prefix to use with the Closure Compiler service's code_url
* parameter.
*
* By default PHP-Closure posts the scripts to the compiler service, however,
* this is subject to a 200000-byte size limit for the whole post request.
*
* Using code_url tells the compiler service the URLs of the scripts to
* fetch. The file paths added in add() must therefore be relative to this
* URL.
*
* Example usage:
*
* $c->add("js/my-app.js")
* ->add("js/popup.js")
* ->useCodeUrl('http://www.example.com/app/')
* ->cacheDir("/tmp/js-cache/")
* ->write();
*
* This assumes your PHP script is in a directory /app/ and that the JS is in
* /app/js/ and accessible via HTTP.
*/
function useCodeUrl($code_url_prefix) {
$this->_code_url_prefix = $code_url_prefix;
return $this;
}
/**
* Tells the compiler to pretty print the output.
*/
function prettyPrint() {
$this->_pretty_print = true;
return $this;
}
/**
* Turns of the debug info.
* By default statistics, errors and warnings are logged to the console.
*/
function hideDebugInfo() {
$this->_debug = false;
return $this;
}
/**
* Sets the compilation mode to optimize whitespace only.
*/
function whitespaceOnly() {
$this->_mode = "WHITESPACE_ONLY";
return $this;
}
/**
* Sets the compilation mode to simple optimizations.
*/
function simpleMode() {
$this->_mode = "SIMPLE_OPTIMIZATIONS";
return $this;
}
/**
* Sets the compilation mode to advanced optimizations (recommended).
*/
function advancedMode() {
$this->_mode = "ADVANCED_OPTIMIZATIONS";
return $this;
}
/**
* Gets the compilation mode from the URL, set the mode param to
* 'w', 's' or 'a'.
*/
function getModeFromUrl() {
if ($_GET['mode'] == 's') $this->simpleMode();
else if ($_GET['mode'] == 'a') $this->advancedMode();
else $this->whitespaceOnly();
return $this;
}
/**
* Sets the warning level to QUIET.
*/
function quiet() {
$this->_warning_level = "QUIET";
return $this;
}
/**
* Sets the default warning level.
*/
function defaultWarnings() {
$this->_warning_level = "DEFAULT";
return $this;
}
/**
* Sets the warning level to VERBOSE.
*/
function verbose() {
$this->_warning_level = "VERBOSE";
return $this;
}
/**
* Writes the compiled response. Reading from either the cache, or
* invoking a recompile, if necessary.
*/
function write() {
header("Content-Type: text/javascript");
// No cache directory so just dump the output.
if ($this->_cache_dir == "") {
echo $this->_compile();
} else {
$cache_file = $this->_getCacheFileName();
if ($this->_isRecompileNeeded($cache_file)) {
$result = $this->_compile();
file_put_contents($cache_file, $result);
echo $result;
} else {
// No recompile needed, but see if we can send a 304 to the browser.
$cache_mtime = filemtime($cache_file);
$etag = md5_file($cache_file);
header("Last-Modified: ".gmdate("D, d M Y H:i:s", $cache_mtime)." GMT");
header("Etag: $etag");
if (@strtotime(@$_SERVER['HTTP_IF_MODIFIED_SINCE']) == $cache_mtime ||
@trim(@$_SERVER['HTTP_IF_NONE_MATCH']) == $etag) {
header("HTTP/1.1 304 Not Modified");
} else {
// Read the cache file and send it to the client.
echo file_get_contents($cache_file);
}
}
}
}
// ----- Privates -----
function _isRecompileNeeded($cache_file) {
// If there is no cache file, we obviously need to recompile.
if (!file_exists($cache_file)) return true;
$cache_mtime = filemtime($cache_file);
// If the source files are newer than the cache file, recompile.
foreach ($this->_srcs as $src) {
if (filemtime($src) > $cache_mtime) return true;
}
// If this script calling the compiler is newer than the cache file,
// recompile. Note, this might not be accurate if the file doing the
// compilation is loaded via an include().
if (filemtime($_SERVER["SCRIPT_FILENAME"]) > $cache_mtime) return true;
// Cache is up to date.
return false;
}
function _compile() {
// Quieten strict notices.
$code = $originalSize = $originalGzipSize = $compressedSize = $compressedGzipSize = $compileTime = '';
$tree = $this->_parseXml($this->_makeRequest());
$result = $tree;
foreach ($result as $node) {
switch ($node["tag"]) {
case "compiledCode": $code = $node["value"]; break;
case "warnings": $warnings = $node["value"]; break;
case "errors": $errors = $node["value"]; break;
case "statistics":
foreach ($node["value"] as $stat) {
switch ($stat["tag"]) {
case "originalSize": $originalSize = $stat["value"]; break;
case "originalGzipSize": $originalGzipSize = $stat["value"]; break;
case "compressedSize": $compressedSize = $stat["value"]; break;
case "compressedGzipSize": $compressedGzipSize = $stat["value"]; break;
case "compileTime": $compileTime = $stat["value"]; break;
}
}
break;
}
}
$result = "";
if ($this->_debug) {
$result = "if(window.console&&window.console.log){\r\n" .
"window.console.log('Closure Compiler Stats:\\n" .
"-----------------------\\n" .
"Original Size: $originalSize\\n" .
"Original Gzip Size: $originalGzipSize\\n" .
"Compressed Size: $compressedSize\\n" .
"Compressed Gzip Size: $compressedGzipSize\\n" .
"Compile Time: $compileTime\\n" .
"Generated: " . Date("Y/m/d H:i:s T") . "');\r\n";
if (isset($errors)) $result .= $this->_printWarnings($errors, "error");
if (isset($warnings)) $result .= $this->_printWarnings($warnings, "warn");
$result .= "}\r\n\r\n";
}
$result .= "$code \r\n";
return $result;
}
function _printWarnings($warnings, $level="log") {
$result = "";
foreach ($warnings as $warning) {
$desc = addslashes($warning["value"]);
$type = $warning["attributes"]["type"];
$lineno = $warning["attributes"]["lineno"];
$charno = $warning["attributes"]["charno"];
$line = addslashes($warning["attributes"]["line"]);
$result .= "window.console.$level('$type: $desc\\nLine: $lineno\\nChar: $charno\\nLine: $line');\r\n";
}
return $result;
}
function _getCacheFileName() {
return $this->_cache_dir . $this->_getHash() . ".js";
}
function _getHash() {
return md5(implode(",", $this->_srcs) . "-" .
$this->_mode . "-" .
$this->_warning_level . "-" .
$this->_use_closure_library . "-" .
$this->_pretty_print . "-" .
$this->_debug);
}
function _getParams() {
$params = array();
foreach ($this->_getParamList() as $key => $value) {
$params[] = preg_replace("/_[0-9]$/", "", $key) . "=" . urlencode($value);
}
return implode("&", $params);
}
function _getParamList() {
$params = array();
if ($this->_code_url_prefix) {
// Send the URL to each source file instead of the raw source.
$i = 0;
foreach($this->_srcs as $file){
$params["code_url_$i"] = $this->_code_url_prefix . $file;
$i++;
}
} else {
$params["js_code"] = $this->_readSources();
}
$params["compilation_level"] = $this->_mode;
$params["output_format"] = "xml";
$params["warning_level"] = $this->_warning_level;
if ($this->_pretty_print) $params["formatting"] = "pretty_print";
if ($this->_use_closure_library) $params["use_closure_library"] = "true";
$params["output_info_1"] = "compiled_code";
$params["output_info_2"] = "statistics";
$params["output_info_3"] = "warnings";
$params["output_info_4"] = "errors";
return $params;
}
function _readSources() {
$code = "";
foreach ($this->_srcs as $src) {
$code .= file_get_contents($src) . "\n\n";
}
return $code;
}
function _makeRequest() {
$data = $this->_getParams();
$referer = @$_SERVER["HTTP_REFERER"] or "";
$fp = fsockopen("closure-compiler.appspot.com", 80) or die("Unable to open socket");;
if ($fp) {
fputs($fp, "POST /compile HTTP/1.1\r\n");
fputs($fp, "Host: closure-compiler.appspot.com\r\n");
fputs($fp, "Referer: $referer\r\n");
fputs($fp, "Content-type: application/x-www-form-urlencoded\r\n");
fputs($fp, "Content-length: ". strlen($data) ."\r\n");
fputs($fp, "Connection: close\r\n\r\n");
fputs($fp, $data);
$result = "";
while (!feof($fp)) {
$result .= fgets($fp, 128);
}
fclose($fp);
}
$data = substr($result, (strpos($result, "\r\n\r\n")+4));
if (strpos(strtolower($result), "transfer-encoding: chunked") !== FALSE) {
$data = $this->_unchunk($data);
}
return $data;
}
function _unchunk($data) {
$fp = 0;
$outData = "";
while ($fp < strlen($data)) {
$rawnum = substr($data, $fp, strpos(substr($data, $fp), "\r\n") + 2);
$num = hexdec(trim($rawnum));
$fp += strlen($rawnum);
$chunk = substr($data, $fp, $num);
$outData .= $chunk;
$fp += strlen($chunk);
}
return $outData;
}
function _parseXml($data) {
$xml = new SimpleXMLElement($data);
return $this->_parseXmlHelper($xml);
}
function _parseXmlHelper($xml) {
$tree = null;
foreach ($xml->children() as $name => $child) {
$value = (string)$child;
$node = array('tag' => $name, 'value' => count($child->children()) == 0 ? $value : $this->_parseXmlHelper($child));
foreach ($child->attributes() as $attr => $value) {
$node['attributes'][$attr] = $value[0];
}
$tree[] = $node;
}
return $tree;
}
}