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<?php |
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/** |
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* @package s9e\TextFormatter |
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* @copyright Copyright (c) 2010-2016 The s9e Authors |
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* @license http://www.opensource.org/licenses/mit-license.php The MIT License |
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*/ |
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namespace s9e\TextFormatter\Configurator\JavaScript\Minifiers; |
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use RuntimeException; |
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use s9e\TextFormatter\Configurator\JavaScript\Minifier; |
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class ClosureCompilerApplication extends Minifier |
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{ |
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/** |
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* @var string Path to the Closure Compiler application |
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*/ |
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public $closureCompilerBin; |
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/** |
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* @var string Closure Compiler's compilation level |
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*/ |
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public $compilationLevel = 'ADVANCED_OPTIMIZATIONS'; |
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/** |
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* @var bool Whether to exclude Closure Compiler's default externs |
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*/ |
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public $excludeDefaultExterns = true; |
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/** |
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* @var string Path to java interpreter |
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*/ |
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public $javaBin = 'java'; |
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/** |
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* @var string Extra options to be passed to the Closure Compiler application |
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*/ |
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public $options = '--use_types_for_optimization'; |
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/** |
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* Constructor |
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* |
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* @param string $filepath Path to the Closure Compiler .jar |
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* @return void |
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*/ |
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public function __construct($filepath = null) |
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{ |
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if (isset($filepath)) |
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{ |
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$this->closureCompilerBin = $filepath; |
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$this->testFilepaths(); |
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} |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getCacheDifferentiator() |
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{ |
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$key = [ |
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$this->compilationLevel, |
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$this->excludeDefaultExterns, |
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$this->options, |
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$this->getClosureCompilerBinHash() |
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]; |
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if ($this->excludeDefaultExterns) |
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{ |
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$key[] = file_get_contents(__DIR__ . '/../externs.application.js'); |
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} |
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return $key; |
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} |
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/** |
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* Compile given JavaScript source via the Closure Compiler application |
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* |
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* @param string $src JavaScript source |
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* @return string Compiled source |
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*/ |
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public function minify($src) |
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{ |
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$this->testFilepaths(); |
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$options = ($this->options) ? ' ' . $this->options : ''; |
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// Add our custom externs if default externs are disabled |
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if ($this->excludeDefaultExterns && $this->compilationLevel === 'ADVANCED_OPTIMIZATIONS') |
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{ |
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$options .= ' --externs ' . __DIR__ . '/../externs.application.js --env=CUSTOM'; |
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} |
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$crc = crc32($src); |
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$inFile = sys_get_temp_dir() . '/' . $crc . '.js'; |
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$outFile = sys_get_temp_dir() . '/' . $crc . '.min.js'; |
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file_put_contents($inFile, $src); |
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$cmd = escapeshellcmd($this->javaBin) |
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. ' -jar ' . escapeshellarg($this->closureCompilerBin) |
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. ' --compilation_level ' . escapeshellarg($this->compilationLevel) |
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. $options |
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. ' --js ' . escapeshellarg($inFile) |
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. ' --js_output_file ' . escapeshellarg($outFile); |
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exec($cmd . ' 2>/dev/null', $output, $return); |
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unlink($inFile); |
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if (file_exists($outFile)) |
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{ |
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$src = trim(file_get_contents($outFile)); |
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unlink($outFile); |
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} |
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if (!empty($return)) |
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{ |
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throw new RuntimeException('An error occured during minification'); |
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} |
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return $src; |
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} |
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/** |
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* Compute and return the hash for current Closure Compiler binary |
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* |
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* @return string |
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*/ |
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protected function getClosureCompilerBinHash() |
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{ |
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// Caching the value saves time during testing but has little to no real-world impact |
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static $cache = []; |
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if (!isset($cache[$this->closureCompilerBin])) |
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{ |
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$cache[$this->closureCompilerBin] = md5_file($this->closureCompilerBin); |
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} |
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return $cache[$this->closureCompilerBin]; |
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} |
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/** |
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* Test that the Closure Compiler file exists |
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* |
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* @return void |
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*/ |
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protected function testFilepaths() |
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{ |
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if (!isset($this->closureCompilerBin)) |
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{ |
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throw new RuntimeException('No path set for Closure Compiler'); |
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} |
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if (!file_exists($this->closureCompilerBin)) |
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{ |
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throw new RuntimeException('Cannot find Closure Compiler at ' . $this->closureCompilerBin); |
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} |
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} |
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} |
s9e /
TextFormatter
