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<?php
/**
* Class Minify_Build
* @package Minify
*/
if (!defined('W3TC')) {
die();
}
w3_require_once(W3TC_LIB_MINIFY_DIR . '/Minify/Source.php');
/**
* Maintain a single last modification time for a group of Minify sources to
* allow use of far off Expires headers in Minify.
*
* <code>
* // in config file
* $groupSources = array(
* 'js' => array('file1.js', 'file2.js')
* ,'css' => array('file1.css', 'file2.css', 'file3.css')
* )
*
* // during HTML generation
* $jsBuild = new Minify_Build($groupSources['js']);
* $cssBuild = new Minify_Build($groupSources['css']);
*
* $script = "<script type='text/javascript' src='"
* . $jsBuild->uri('/min.php/js') . "'></script>";
* $link = "<link rel='stylesheet' type='text/css' href='"
* . $cssBuild->uri('/min.php/css') . "'>";
*
* // in min.php
* Minify::serve('Groups', array(
* 'groups' => $groupSources
* ,'setExpires' => (time() + 86400 * 365)
* ));
* </code>
*
* @package Minify
* @author Stephen Clay <steve@mrclay.org>
*/
class Minify_Build {
/**
* Last modification time of all files in the build
*
* @var int
*/
public $lastModified = 0;
/**
* String to use as ampersand in uri(). Set this to '&' if
* you are not HTML-escaping URIs.
*
* @var string
*/
public static $ampersand = '&';
/**
* Get a time-stamped URI
*
* <code>
* echo $b->uri('/site.js');
* // outputs "/site.js?1678242"
*
* echo $b->uri('/scriptaculous.js?load=effects');
* // outputs "/scriptaculous.js?load=effects&1678242"
* </code>
*
* @param string $uri
* @param boolean $forceAmpersand (default = false) Force the use of ampersand to
* append the timestamp to the URI.
* @return string
*/
public function uri($uri, $forceAmpersand = false) {
$sep = ($forceAmpersand || strpos($uri, '?') !== false)
? self::$ampersand
: '?';
return "{$uri}{$sep}{$this->lastModified}";
}
/**
* Create a build object
*
* @param array $sources array of Minify_Source objects and/or file paths
*
* @return null
*/
public function __construct($sources)
{
$max = 0;
foreach ((array)$sources as $source) {
if ($source instanceof Minify_Source) {
$max = max($max, $source->lastModified);
} elseif (is_string($source)) {
if (0 === strpos($source, '//')) {
$source = $_SERVER['DOCUMENT_ROOT'] . substr($source, 1);
}
if (is_file($source)) {
$max = max($max, filemtime($source));
}
}
}
$this->lastModified = $max;
}
}
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