/**
* @param $output
* @param string $type
* @return mixed
*/
private function minify($output, $type = 'text/html')
{
$elapsed = $this->benchmark->elapsed_time('total_execution_time_start', 'total_execution_time_end');
$memory = round(memory_get_usage() / 1024 / 1024, 2) . 'MB';
$output = str_replace(array('{elapsed_time}', '{memory_usage}'), array($elapsed, $memory), $output);
if ($this->config->item('minify_output') === TRUE) {
$this->load->library('Jsmin', array(''));
$size_ini = strlen($output);
if ($size_ini === 0) {
return '';
}
switch ($type) {
case 'text/html':
// Find all the <pre>,<code>,<textarea>, and <javascript> tags
// We'll want to return them to this unprocessed state later.
preg_match_all('{<pre.+</pre>}msU', $output, $pres_clean);
preg_match_all('{<code.+</code>}msU', $output, $codes_clean);
preg_match_all('{<textarea.+</textarea>}msU', $output, $textareas_clean);
preg_match_all('{<script.+</script>}msU', $output, $javascript_clean);
// Minify the CSS in all the <style> tags.
preg_match_all('{<style.+</style>}msU', $output, $style_clean);
foreach ($style_clean[0] as $s) {
$output = str_replace($s, $this->minify($s, 'text/css'), $output);
}
// Minify the javascript in <script> tags.
foreach ($javascript_clean[0] as $s) {
$javascript_mini[] = $this->minify($s, 'text/javascript');
}
// Replace multiple spaces with a single space.
$output = preg_replace('!\\s{2,}!', ' ', $output);
// Remove comments (non-MSIE conditionals)
$output = preg_replace('{\\s*<!--[^\\[<>].*(?<!!)-->\\s*}msU', '', $output);
// Remove spaces around block-level elements.
$output = preg_replace('/\\s*(<\\/?(html|head|title|meta|script|link|style|body|h[1-6]|div|p|br)[^>]*>)\\s*/is', '$1', $output);
// Replace mangled <pre> etc. tags with unprocessed ones.
if (!empty($pres_clean)) {
preg_match_all('{<pre.+</pre>}msU', $output, $pres_messed);
$output = str_replace($pres_messed[0], $pres_clean[0], $output);
}
if (!empty($codes_clean)) {
preg_match_all('{<code.+</code>}msU', $output, $codes_messed);
$output = str_replace($codes_messed[0], $codes_clean[0], $output);
}
if (!empty($codes_clean)) {
preg_match_all('{<textarea.+</textarea>}msU', $output, $textareas_messed);
$output = str_replace($textareas_messed[0], $textareas_clean[0], $output);
}
if (isset($javascript_mini)) {
preg_match_all('{<script.+</script>}msU', $output, $javascript_messed);
$output = str_replace($javascript_messed[0], $javascript_mini, $output);
}
break;
case 'text/css':
// Remove CSS comments
$output = preg_replace('!/\\*[^*]*\\*+([^/][^*]*\\*+)*/!', '', $output);
// Remove spaces around curly brackets, colons, semi-colons, parenthesis, commas
$output = preg_replace('!\\s*(:|;|,|}|{|\\(|\\))\\s*!', '$1', $output);
break;
case 'text/javascript':
$output = Jsmin::minify($output);
break;
default:
break;
}
$size_end = $size_ini - strlen($output);
log_message('debug', 'Minifier shaved ' . $size_end / 1000 . 'KB (' . round($size_end / $size_ini * 100) . '%) off final HTML output.');
}
return $output;
}
/**
* Minify Javascript
*
* @uses __construct()
* @uses min()
* @param string $js Javascript to be minified
* @return string
*/
public static function minify($js)
{
$jsmin = new Jsmin($js);
return $jsmin->min();
}
