Easy-Min/css.php

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<?php
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/**
* Easy Min
*
* Simple minification for better website performance
*
* @author Timothy J. Warren
* @copyright Copyright (c) 2012-2016
* @link https://git.timshomepage.net/aviat4ion/Easy-Min
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* @license http://philsturgeon.co.uk/code/dbad-license
*/
// --------------------------------------------------------------------------
namespace Aviat\EasyMin;
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require_once('./min.php');
/**
* Simple CSS Minifier
*/
class CSSMin extends BaseMin {
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protected $css_root;
protected $path_from;
protected $path_to;
protected $group;
protected $last_modified;
protected $requested_time;
public function __construct(array $config, array $groups)
{
$group = $_GET['g'];
$this->css_root = $config['css_root'];
$this->path_from = $config['path_from'];
$this->path_to = $config['path_to'];
$this->group = $groups[$group];
$this->last_modified = $this->get_last_modified();
$this->send();
}
/**
* Send the CSS
*
* @return void
*/
protected function send()
{
if($this->last_modified >= $this->get_if_modified() && $this->is_not_debug())
{
throw new FileNotChangedException();
}
$css = ( ! array_key_exists('debug', $_GET))
? $this->compress($this->get_css())
: $this->get_css();
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$this->output($css);
}
/**
* Function for compressing the CSS as tightly as possible
*
* @param string $buffer
* @return string
*/
protected function compress($buffer)
{
//Remove CSS comments
$buffer = preg_replace('!/\*[^*]*\*+([^/][^*]*\*+)*/!', '', $buffer);
//Remove tabs, spaces, newlines, etc.
$buffer = preg_replace('`\s+`', ' ', $buffer);
$replace = array(
' )' => ')',
') ' => ')',
' }' => '}',
'} ' => '}',
' {' => '{',
'{ ' => '{',
', ' => ',',
': ' => ':',
'; ' => ';',
);
//Eradicate every last space!
$buffer = trim(strtr($buffer, $replace));
$buffer = str_replace('{ ', '{', $buffer);
$buffer = str_replace('} ', '}', $buffer);
return $buffer;
}
/**
* Get the most recent file modification date
*
* @return int
*/
protected function get_last_modified()
{
$modified = array();
// Get all the css files, and concatenate them together
if(isset($this->group))
{
foreach($this->group as $file)
{
$new_file = realpath("{$this->css_root}{$file}");
$modified[] = filemtime($new_file);
}
}
//Add this page for last modified check
$modified[] = filemtime(__FILE__);
//Get the latest modified date
rsort($modified);
return array_shift($modified);
}
/**
* Get the css to display
*
* @return string
*/
protected function get_css()
{
$css = '';
foreach($this->group as $file)
{
$new_file = realpath("{$this->css_root}{$file}");
$css .= file_get_contents($new_file);
}
// Correct paths that have changed due to concatenation
// based on rules in the config file
$css = str_replace($this->path_from, $this->path_to, $css);
return $css;
}
/**
* Output the CSS
*
* @return void
*/
protected function output($css)
{
$this->send_final_output($css, 'text/css', $this->last_modified);
}
}
// --------------------------------------------------------------------------
// ! Start Minifying
// --------------------------------------------------------------------------
//Get config files
$config = require('config/config.php');
$groups = require($config['css_groups_file']);
if ( ! array_key_exists($_GET['g'], $groups))
{
throw new InvalidArgumentException('You must specify a css group that exists');
}
try
{
new CSSMin($config, $groups);
}
catch (FileNotChangedException $e)
{
BaseMin::send304();
}
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//End of css.php