/** * Class Minify_HTML * @package Minify */ /** * Compress HTML * * This is a heavy regex-based removal of whitespace, unnecessary comments and * tokens. IE conditional comments are preserved. There are also options to have * STYLE and SCRIPT blocks compressed by callback functions. * * A test suite is available. * * @package Minify * @author Stephen Clay */ class Minify_HTML { /** * "Minify" an HTML page * * @param string $html * * @param array $options * * 'cssMinifier' : (optional) callback function to process content of STYLE * elements. * * 'jsMinifier' : (optional) callback function to process content of SCRIPT * elements. Note: the type attribute is ignored. * * 'xhtml' : (optional boolean) should content be treated as XHTML1.0? If * unset, minify will sniff for an XHTML doctype. * * 'keepComments' : (optional boolean) should the HTML comments be kept * in the HTML Code? * * @return string */ public static function minify($html, $options = array()) { $min = new Minify_HTML($html, $options); return $min->process(); } /** * Create a minifier object * * @param string $html * * @param array $options * * 'cssMinifier' : (optional) callback function to process content of STYLE * elements. * * 'jsMinifier' : (optional) callback function to process content of SCRIPT * elements. Note: the type attribute is ignored. * * 'xhtml' : (optional boolean) should content be treated as XHTML1.0? If * unset, minify will sniff for an XHTML doctype. * * 'xhtml' : (optional boolean) should content be treated as XHTML1.0? If * unset, minify will sniff for an XHTML doctype. * * @return null */ public function __construct($html, $options = array()) { $this->_html = str_replace("\r\n", "\n", trim($html)); if (isset($options['xhtml'])) { $this->_isXhtml = (bool)$options['xhtml']; } if (isset($options['cssMinifier'])) { $this->_cssMinifier = $options['cssMinifier']; } if (isset($options['jsMinifier'])) { $this->_jsMinifier = $options['jsMinifier']; } if (isset($options['keepComments'])) { $this->_keepComments = $options['keepComments']; } } /** * Minify the markeup given in the constructor * * @return string */ public function process() { if ($this->_isXhtml === null) { $this->_isXhtml = (false !== strpos($this->_html, '_replacementHash = 'MINIFYHTML' . md5($_SERVER['REQUEST_TIME']); $this->_placeholders = array(); // replace SCRIPTs (and minify) with placeholders $this->_html = preg_replace_callback( '/(\\s*)(]*?>)([\\s\\S]*?)<\\/script>(\\s*)/i' ,array($this, '_removeScriptCB') ,$this->_html); // replace STYLEs (and minify) with placeholders $this->_html = preg_replace_callback( '/\\s*(]*?>)([\\s\\S]*?)<\\/style>\\s*/i' ,array($this, '_removeStyleCB') ,$this->_html); // remove HTML comments (not containing IE conditional comments). if ($this->_keepComments == false) { $this->_html = preg_replace_callback( '//' ,array($this, '_commentCB') ,$this->_html); } // replace PREs with placeholders $this->_html = preg_replace_callback('/\\s*(]*?>[\\s\\S]*?<\\/pre>)\\s*/i' ,array($this, '_removePreCB') ,$this->_html); // replace TEXTAREAs with placeholders $this->_html = preg_replace_callback( '/\\s*(]*?>[\\s\\S]*?<\\/textarea>)\\s*/i' ,array($this, '_removeTextareaCB') ,$this->_html); // replace data: URIs with placeholders $this->_html = preg_replace_callback( '/(=("|\')data:.*\\2)/Ui' ,array($this, '_removeDataURICB') ,$this->_html); // trim each line. // @todo take into account attribute values that span multiple lines. $this->_html = preg_replace('/^\\s+|\\s+$/m', '', $this->_html); // remove ws around block/undisplayed elements $this->_html = preg_replace('/\\s+(<\\/?(?:area|article|aside|base(?:font)?|blockquote|body' .'|canvas|caption|center|col(?:group)?|dd|dir|div|dl|dt|fieldset|figcaption|figure|footer|form' .'|frame(?:set)?|h[1-6]|head|header|hgroup|hr|html|legend|li|link|main|map|menu|meta|nav' .'|ol|opt(?:group|ion)|output|p|param|section|t(?:able|body|head|d|h||r|foot|itle)' .'|ul|video)\\b[^>]*>)/i', '$1', $this->_html); // remove ws outside of all elements $this->_html = preg_replace_callback( '/>([^<]+)_html); // use newlines before 1st attribute in open tags (to limit line lengths) //$this->_html = preg_replace('/(<[a-z\\-]+)\\s+([^>]+>)/i', "$1\n$2", $this->_html); // fill placeholders $this->_html = str_replace( array_keys($this->_placeholders) ,array_values($this->_placeholders) ,$this->_html ); return $this->_html; } protected function _commentCB($m) { return (0 === strpos($m[1], '[') || false !== strpos($m[1], '_replacementHash . count($this->_placeholders) . '%'; $this->_placeholders[$placeholder] = $content; return $placeholder; } protected $_isXhtml = null; protected $_replacementHash = null; protected $_placeholders = array(); protected $_cssMinifier = null; protected $_jsMinifier = null; protected $_keepComments = false; protected function _outsideTagCB($m) { return '>' . preg_replace('/^\\s+|\\s+$/', ' ', $m[1]) . '<'; } protected function _removePreCB($m) { return $this->_reservePlace($m[1]); } protected function _removeTextareaCB($m) { return $this->_reservePlace($m[1]); } protected function _removeDataURICB($m) { return $this->_reservePlace($m[1]); } protected function _removeStyleCB($m) { $openStyle = $m[1]; $css = $m[2]; // remove HTML comments $css = preg_replace('/(?:^\\s*\\s*$)/', '', $css); // remove CDATA section markers $css = $this->_removeCdata($css); // minify $minifier = $this->_cssMinifier ? $this->_cssMinifier : 'trim'; $css = call_user_func($minifier, $css); return $this->_reservePlace($this->_needsCdata($css) ? "{$openStyle}/**/" : "{$openStyle}{$css}" ); } protected function _removeScriptCB($m) { $openScript = $m[2]; $js = $m[3]; // whitespace surrounding? preserve at least one space $ws1 = ($m[1] === '') ? '' : ' '; $ws2 = ($m[4] === '') ? '' : ' '; // remove HTML comments (and ending "//" if present) $js = preg_replace('/(?:^\\s*\\s*$)/', '', $js); // remove CDATA section markers $js = $this->_removeCdata($js); // minify $minifier = $this->_jsMinifier ? $this->_jsMinifier : 'trim'; $js = call_user_func($minifier, $js); return $this->_reservePlace($this->_needsCdata($js) ? "{$ws1}{$openScript}/**/{$ws2}" : "{$ws1}{$openScript}{$js}{$ws2}" ); } protected function _removeCdata($str) { return (false !== strpos($str, ' */','/**/',''), '', $str) : $str; } protected function _needsCdata($str) { return ($this->_isXhtml && preg_match('/(?:[<&]|\\-\\-|\\]\\]>)/', $str)); } }