<?php
/**
* @package s9e\TextFormatter
* @copyright Copyright (c) 2010-2021 The s9e authors
* @license http://www.opensource.org/licenses/mit-license.php The MIT License
*/
namespace s9e\TextFormatter\Configurator\JavaScript;
use Exception;
abstract class Minifier
{
/**
* @var string Directory in which minified sources are cached
*/
public $cacheDir;
/**
* @var bool If TRUE, don't interrupt get() if an exception is thrown. Instead, return the original source
*/
public $keepGoing = false;
/**
* Minify given JavaScript source
*
* @param string $src JavaScript source
* @return string Minified source
*/
abstract public function minify($src);
/**
* Minify given JavaScript source and cache the result if applicable
*
* @param string $src JavaScript source
* @return string Minified source
*/
public function get($src)
{
try
{
return (isset($this->cacheDir)) ? $this->getFromCache($src) : $this->minify($src);
}
catch (Exception $e)
{
if (!$this->keepGoing)
{
throw $e;
}
}
return $src;
}
/**
* Return a value that uniquely identifies this minifier's configuration
*
* @return array|string
*/
public function getCacheDifferentiator()
{
return '';
}
/**
* Get the minified source from cache, or minify and cache the result
*
* @param string $src JavaScript source
* @return string Minified source
*/
protected function getFromCache($src)
{
$differentiator = $this->getCacheDifferentiator();
$key = sha1(serialize([get_class($this), $differentiator, $src]));
$cacheFile = $this->cacheDir . '/minifier.' . $key . '.js';
if (!file_exists($cacheFile))
{
file_put_contents($cacheFile, $this->minify($src));
}
return file_get_contents($cacheFile);
}
}