s9e\TextFormatter\Configurator\JavaScript\Minifiers\ClosureCompilerApplication

Complexity

Total Complexity

15

Size/Duplication

Total Lines	142
Duplicated Lines	0 %

Coupling/Cohesion

Components	1
Dependencies	1

Test Coverage

Coverage

97.87%

Importance

Changes

0

5 Methods

Rating	Name	Duplication	Size	Complexity
A	__construct()	0	8	2
A	getCacheDifferentiator()	0	16	2
A	getClosureCompilerBinHash()	0	11	2
A	testFilepaths()	0	11	3
B	minify()	0	40	6

<?php

/**
* @package   s9e\TextFormatter
* @copyright Copyright (c) 2010-2018 The s9e Authors
* @license   http://www.opensource.org/licenses/mit-license.php The MIT License
*/
namespace s9e\TextFormatter\Configurator\JavaScript\Minifiers;

use RuntimeException;
use s9e\TextFormatter\Configurator\JavaScript\Minifier;

class ClosureCompilerApplication extends Minifier
{
	/**
	* @var string Path to the Closure Compiler application
	*/
	public $closureCompilerBin;

	/**
	* @var string Closure Compiler's compilation level
	*/
	public $compilationLevel = 'ADVANCED_OPTIMIZATIONS';

	/**
	* @var bool Whether to exclude Closure Compiler's default externs
	*/
	public $excludeDefaultExterns = true;

	/**
	* @var string Path to java interpreter
	*/
	public $javaBin = 'java';

	/**
	* @var string Extra options to be passed to the Closure Compiler application
	*/
	public $options = '--use_types_for_optimization';

	/**
	* Constructor
	*
	* @param  string $filepath Path to the Closure Compiler .jar
	*/
	public function __construct($filepath = null)
	{
		if (isset($filepath))
		{
			$this->closureCompilerBin = $filepath;
			$this->testFilepaths();
		}
	}

	/**
	* {@inheritdoc}
	*/
	public function getCacheDifferentiator()
	{
		$key = [
			$this->compilationLevel,
			$this->excludeDefaultExterns,
			$this->options,
			$this->getClosureCompilerBinHash()
		];

		if ($this->excludeDefaultExterns)
		{
			$key[] = file_get_contents(__DIR__ . '/../externs.application.js');
		}

		return $key;
	}

	/**
	* Compile given JavaScript source via the Closure Compiler application
	*
	* @param  string $src JavaScript source
	* @return string      Compiled source
	*/
	public function minify($src)
	{
		$this->testFilepaths();
		$options = ($this->options) ? ' ' . $this->options : '';

		// Add our custom externs if default externs are disabled
		if ($this->excludeDefaultExterns && $this->compilationLevel === 'ADVANCED_OPTIMIZATIONS')
		{
			$options .= ' --externs ' . __DIR__ . '/../externs.application.js --env=CUSTOM';
		}

		$crc     = crc32($src);
		$inFile  = sys_get_temp_dir() . '/' . $crc . '.js';
		$outFile = sys_get_temp_dir() . '/' . $crc . '.min.js';

		file_put_contents($inFile, $src);

		$cmd = escapeshellcmd($this->javaBin)
		     . ' -jar ' . escapeshellarg($this->closureCompilerBin)
		     . ' --compilation_level ' . escapeshellarg($this->compilationLevel)
		     . $options
		     . ' --js ' . escapeshellarg($inFile)
		     . ' --js_output_file ' . escapeshellarg($outFile);

		exec($cmd . ' 2>&1', $output, $return);
		unlink($inFile);

		if (file_exists($outFile))
		{
			$src = trim(file_get_contents($outFile));
			unlink($outFile);
		}

		if (!empty($return))
		{
			throw new RuntimeException('An error occured during minification: ' . implode("\n", $output));
		}

		return $src;
	}

	/**
	* Compute and return the hash for current Closure Compiler binary
	*
	* @return string
	*/
	protected function getClosureCompilerBinHash()
	{
		// Caching the value saves time during testing but has little to no real-world impact
		static $cache = [];
		if (!isset($cache[$this->closureCompilerBin]))
		{
			$cache[$this->closureCompilerBin] = md5_file($this->closureCompilerBin);
		}

		return $cache[$this->closureCompilerBin];
	}

	/**
	* Test that the Closure Compiler file exists
	*
	* @return void
	*/
	protected function testFilepaths()
	{
		if (!isset($this->closureCompilerBin))
		{
			throw new RuntimeException('No path set for Closure Compiler');
		}
		if (!file_exists($this->closureCompilerBin))
		{
			throw new RuntimeException('Cannot find Closure Compiler at ' . $this->closureCompilerBin);
		}
	}
}