*/
class Minify_HTML {
/**
* "Minify" an HTML page
*
* @param string $html
* @param array $options
* @return string
*/
public static function minify($html, $options = array()) {
if (isset($options['cssMinifier'])) {
self::$_cssMinifier = $options['cssMinifier'];
}
if (isset($options['jsMinifier'])) {
self::$_jsMinifier = $options['jsMinifier'];
}
$html = str_replace("\r\n", "\n", trim($html));
self::$_isXhtml = (false !== strpos($html, ']*?>)([\\s\\S]*?)<\\/script>\\s*/i'
,array('Minify_HTML', '_removeScriptCB')
,$html);
// replace STYLEs (and minify) with placeholders
$html = preg_replace_callback(
'/\\s*(]*?>)([\\s\\S]*?)<\\/style>\\s*/i'
,array('Minify_HTML', '_removeStyleCB')
,$html);
// remove HTML comments (but not IE conditional comments).
$html = preg_replace('//', '', $html);
// replace PREs with placeholders
$html = preg_replace_callback('/\\s*(]*?>[\\s\\S]*?<\\/pre>)\\s*/i'
,array('Minify_HTML', '_removePreCB')
, $html);
// replace TEXTAREAs with placeholders
$html = preg_replace_callback(
'/\\s*(]*?>[\\s\\S]*?<\\/textarea>)\\s*/i'
,array('Minify_HTML', '_removeTaCB')
, $html);
// trim each line.
// @todo take into account attribute values that span multiple lines.
$html = preg_replace('/^\\s+|\\s+$/m', '', $html);
// remove ws around block/undisplayed elements
$html = preg_replace('/\\s+(<\\/?(?:area|base(?:font)?|blockquote|body'
.'|caption|center|cite|col(?:group)?|dd|dir|div|dl|dt|fieldset|form'
.'|frame(?:set)?|h[1-6]|head|hr|html|legend|li|link|map|menu|meta'
.'|ol|opt(?:group|ion)|p|param|t(?:able|body|head|d|h||r|foot|itle)'
.'|ul)\\b[^>]*>)/i', '$1', $html);
// remove ws outside of all elements
$html = preg_replace_callback(
'/>([^<]+)]+>)/i', "$1\n$2", $html);
self::$_cssMinifier = self::$_jsMinifier = null;
return $html;
}
protected static function _reservePlace($content)
{
$placeholder = '%' . self::$_replacementHash . count(self::$_placeholders) . '%';
self::$_placeholders[$placeholder] = $content;
return $placeholder;
}
protected static $_isXhtml = false;
protected static $_replacementHash = null;
protected static $_placeholders = array();
protected static $_cssMinifier = null;
protected static $_jsMinifier = null;
protected static function _outsideTagCB($m)
{
return '>' . preg_replace('/^\\s+|\\s+$/', ' ', $m[1]) . '<';
}
protected static function _removePreCB($m)
{
return self::_reservePlace($m[1]);
}
protected static function _removeTaCB($m)
{
return self::_reservePlace($m[1]);
}
protected static function _removeStyleCB($m)
{
$openStyle = $m[1];
$css = $m[2];
// remove HTML comments
$css = preg_replace('/(?:^\\s*\\s*$)/', '', $css);
// remove CDATA section markers
$css = self::_removeCdata($css);
// minify
$minifier = self::$_cssMinifier
? self::$_cssMinifier
: 'trim';
$css = call_user_func($minifier, $css);
return self::_reservePlace(self::_needsCdata($css)
? "{$openStyle}/**/"
: "{$openStyle}{$css}"
);
}
protected static function _removeScriptCB($m)
{
$openScript = $m[1];
$js = $m[2];
// remove HTML comments (and ending "//" if present)
$js = preg_replace('/(?:^\\s*\\s*$)/', '', $js);
// remove CDATA section markers
$js = self::_removeCdata($js);
// minify
$minifier = self::$_jsMinifier
? self::$_jsMinifier
: 'trim';
$js = call_user_func($minifier, $js);
return self::_reservePlace(self::_needsCdata($js)
? "{$openScript}/**/"
: "{$openScript}{$js}"
);
}
protected static function _removeCdata($str)
{
return (false !== strpos($str, ''), '', $str)
: $str;
}
protected static function _needsCdata($str)
{
return (self::$_isXhtml && preg_match('/(?:[<&]|\\-\\-|\\]\\]>)/', $str));
}
}