Cache.php
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<?php
/**
* PHPTAL templating engine
*
* PHP Version 5
*
* @category HTML
* @package PHPTAL
* @author Laurent Bedubourg <lbedubourg@motion-twin.com>
* @author Kornel Lesiński <kornel@aardvarkmedia.co.uk>
* @license http://www.gnu.org/licenses/lgpl.html GNU Lesser General Public License
* @version SVN: $Id: Cache.php 671 2009-07-11 18:11:35Z kornel $
* @link http://phptal.org/
*/
/**
* phptal:cache (note that's not tal:cache) caches element's HTML for a given time. Time is a number with 'd', 'h', 'm' or 's' suffix.
* There's optional parameter that defines how cache should be shared. By default cache is not sensitive to template's context at all
* - it's shared between all pages that use that template.
* You can add per url to have separate copy of given element for every URL.
*
* You can add per expression to have different cache copy for every different value of an expression (which MUST evaluate to a string).
* Expression cannot refer to variables defined using tal:define on the same element.
*
* NB:
* * phptal:cache blocks can be nested, but outmost block will cache other blocks regardless of their freshness.
* * you cannot use metal:fill-slot inside elements with phptal:cache
*
* Examples:
* <div phptal:cache="3h">...</div> <!-- <div> to be evaluated at most once per 3 hours. -->
* <ul phptal:cache="1d per object/id">...</ul> <!-- <ul> be cached for one day, separately for each object. -->
*
* @package PHPTAL
* @subpackage Php.attribute.phptal
*/
class PHPTAL_Php_Attribute_PHPTAL_Cache extends PHPTAL_Php_Attribute
{
private $cache_tag;
public function before(PHPTAL_Php_CodeWriter $codewriter)
{
// number or variable name followed by time unit
// optional per expression
if (!preg_match('/^\s*([0-9]+\s*|[a-zA-Z][a-zA-Z0-9_]*\s+)([dhms])\s*(?:\;?\s*per\s+([^;]+)|)\s*$/', $this->expression, $matches)) {
throw new PHPTAL_ParserException("Cache attribute syntax error: ".$this->expression);
}
$cache_len = $matches[1];
if (!is_numeric($cache_len)) {
$cache_len = '$ctx->'.$cache_len;
}
switch ($matches[2]) {
case 'd': $cache_len .= '*24'; /* no break */
case 'h': $cache_len .= '*60'; /* no break */
case 'm': $cache_len .= '*60'; /* no break */
}
$this->cache_tag = '"'.addslashes( $this->phpelement->getQualifiedName() . ':' . $this->phpelement->getSourceLine()).'"';
$cache_per_expression = isset($matches[3])?trim($matches[3]):null;
if ($cache_per_expression == 'url') {
$this->cache_tag .= '.$_SERVER["REQUEST_URI"]';
} elseif ($cache_per_expression == 'nothing') {
/* do nothing */
} elseif ($cache_per_expression) {
$code = $codewriter->evaluateExpression($cache_per_expression);
if (is_array($code)) { throw new PHPTAL_ParserException("Chained expressions in per-cache directive are not supported"); }
$old_cache_tag = $this->cache_tag;
$this->cache_tag = '$ctx->cache_tag_';
$codewriter->doSetVar($this->cache_tag, '('.$code.')."@".' . $old_cache_tag );
}
$cond = '!file_exists('.$codewriter->str($codewriter->getCacheFilesBaseName()).'.md5('.$this->cache_tag.')) || time() - '.$cache_len.' >= filemtime('.$codewriter->str($codewriter->getCacheFilesBaseName()).'.md5('.$this->cache_tag.'))';
$codewriter->doIf($cond);
$codewriter->doEval('ob_start()');
}
public function after(PHPTAL_Php_CodeWriter $codewriter)
{
$codewriter->doEval('file_put_contents('.$codewriter->str($codewriter->getCacheFilesBaseName()).'.md5('.$this->cache_tag.'), ob_get_flush())');
$codewriter->doElse();
$codewriter->doEval('readfile('.$codewriter->str($codewriter->getCacheFilesBaseName()).'.md5('.$this->cache_tag.'))');
$codewriter->doEnd('if');
}
}