*/
class Minify_HTML {
/**
* "Minify" an HTML page
*
* @todo: To also minify embedded Javascript/CSS, you must...
*
*/
public static function minify($string, $options = array()) {
if (isset($options['cssMinifier'])) {
self::$_cssMinifier = $options['cssMinifier'];
}
if (isset($options['jsMinifier'])) {
self::$_jsMinifier = $options['jsMinifier'];
}
$html = trim($string);
self::$_isXhtml = (false !== strpos($html, ']*?>)([\\s\\S]*?)<\\/script>\\s*/i',
array('Minify_HTML', '_removeScriptCB'), $html);
// remove STYLEs (and minify)
$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('//', '', $html);
// replace PREs with token text
self::$_pres = array();
$html = preg_replace_callback('/\\s*(]*?>[\\s\\S]*?<\\/pre>)\\s*/i'
,array('Minify_HTML', '_removePreCB')
, $html);
// remove leading and trailing ws from each line.
// @todo take into account attribute values that span multiple lines.
$html = preg_replace('/^\\s*(.*?)\\s*$/m', "$1", $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)|title'
.'|ul)\\b[^>]*>)/i', '$1', $html);
// remove ws between and inside elements.
$html = preg_replace('/>\\s+(\\S[\\s\\S]*?)? $1<", $html);
$html = preg_replace('/>(\\S[\\s\\S]*?)?\\s+$1 <", $html);
$html = preg_replace('/>\\s+ <", $html);
// replace PREs
$i = count(self::$_pres);
while ($i > 0) {
$rep = array_pop(self::$_pres);
$html = str_replace(self::$_replacementHash . 'PRE' . $i, $rep, $html);
$i--;
}
// replace SCRIPTs
$i = count(self::$_scripts);
while ($i > 0) {
$rep = array_pop(self::$_scripts);
$html = str_replace(self::$_replacementHash . 'SCRIPT' . $i, $rep, $html);
$i--;
}
// replace STYLEs
$i = count(self::$_styles);
while ($i > 0) {
$rep = array_pop(self::$_styles);
$html = str_replace(self::$_replacementHash . 'STYLE' . $i, $rep, $html);
$i--;
}
self::$_cssMinifier = self::$_jsMinifier = null;
return $html;
}
protected static $_isXhtml = false;
protected static $_replacementHash = null;
protected static $_pres = array();
protected static $_scripts = array();
protected static $_styles = array();
protected static $_cssMinifier = null;
protected static $_jsMinifier = null;
protected static function _removePreCB($m)
{
self::$_pres[] = $m[1];
return self::$_replacementHash . 'PRE' . count(self::$_pres);
}
protected static function _removeStyleCB($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, $css);
// store
self::$_styles[] = self::_needsCdata($css)
? "{$openStyle}/**/"
: "{$openStyle}{$css}";
return self::$_replacementHash . 'STYLE' . count(self::$_styles);
}
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, $js);
// store
self::$_scripts[] = self::_needsCdata($js)
? "{$openScript}/**/"
: "{$openScript}{$js}";
return self::$_replacementHash . 'SCRIPT' . count(self::$_scripts);
}
protected static function _removeCdata($str)
{
return (false !== strpos($str, ''), '', $str)
: $str;
}
protected static function _needsCdata($str)
{
return (self::$_isXhtml && preg_match('/(?:[<&]|\\-\\-|\\]\\]>)/', $str));
}
}