*/
class Minify_HTML {
/**
* Defines which class to call as part of callbacks, change this
* if you extend Minify_HTML
* @var string
*/
protected static $className = 'Minify_HTML';
/**
* "Minify" an HTML page
*
* @param string $html
*
* @param array $options
*
* 'cssMinifier' : (optional) callback function to process content of STYLE
* elements.
*
* 'jsMinifier' : (optional) callback function to process content of SCRIPT
* elements. Note: the type attribute is ignored.
*
* 'xhtml' : (optional boolean) should content be treated as XHTML1.0? If
* unset, minify will sniff for an XHTML doctype.
*
* @return string
*/
public static function minify($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::$_isXhtml = (
isset($options['xhtml'])
? (bool)$options['xhtml']
: (false !== strpos($html, ']*?>)([\\s\\S]*?)<\\/script>\\s*/i'
,array(self::$className, '_removeScriptCB')
,$html);
// replace STYLEs (and minify) with placeholders
$html = preg_replace_callback(
'/\\s*(]*?>)([\\s\\S]*?)<\\/style>\\s*/i'
,array(self::$className, '_removeStyleCB')
,$html);
// remove HTML comments (not containing IE conditional comments).
$html = preg_replace_callback(
'//'
,array(self::$className, '_commentCB')
,$html);
// replace PREs with placeholders
$html = preg_replace_callback('/\\s*(]*?>[\\s\\S]*?<\\/pre>)\\s*/i'
,array(self::$className, '_removePreCB')
, $html);
// replace TEXTAREAs with placeholders
$html = preg_replace_callback(
'/\\s*(]*?>[\\s\\S]*?<\\/textarea>)\\s*/i'
,array(self::$className, '_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);
// fill placeholders
$html = str_replace(
array_keys(self::$_placeholders)
,array_values(self::$_placeholders)
,$html
);
self::$_placeholders = array();
self::$_cssMinifier = self::$_jsMinifier = null;
return $html;
}
protected static function _commentCB($m)
{
return (0 === strpos($m[1], '[') || false !== strpos($m[1], '' . 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));
}
}