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- <?php
- /**
- * 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 <steve@mrclay.org>
- */
- class Minify_HTML {
- /**
- * @var boolean
- */
- protected $_jsCleanComments = true;
- /**
- * "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()) {
- $min = new self($html, $options);
- return $min->process();
- }
- /**
- * Create a minifier object
- *
- * @param string $html
- *
- * @param array $options
- *
- * 'cssMinifier' : (optional) callback function to process content of STYLE
- * elements.
- *
- * 'jsMinifier' : (optional) callback function to process content of SCRIPT
- * elements. Note: the type attribute is ignored.
- *
- * 'jsCleanComments' : (optional) whether to remove HTML comments beginning and end of script block
- *
- * 'xhtml' : (optional boolean) should content be treated as XHTML1.0? If
- * unset, minify will sniff for an XHTML doctype.
- */
- public function __construct($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['jsCleanComments'])) {
- $this->_jsCleanComments = (bool)$options['jsCleanComments'];
- }
- }
- /**
- * Minify the markeup given in the constructor
- *
- * @return string
- */
- public function process()
- {
- if ($this->_isXhtml === null) {
- $this->_isXhtml = (false !== strpos($this->_html, '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML'));
- }
-
- $this->_replacementHash = 'MINIFYHTML' . md5($_SERVER['REQUEST_TIME']);
- $this->_placeholders = array();
-
- // replace SCRIPTs (and minify) with placeholders
- $this->_html = preg_replace_callback(
- '/(\\s*)<script(\\b[^>]*?>)([\\s\\S]*?)<\\/script>(\\s*)/i'
- ,array($this, '_removeScriptCB')
- ,$this->_html);
-
- // replace STYLEs (and minify) with placeholders
- $this->_html = preg_replace_callback(
- '/\\s*<style(\\b[^>]*>)([\\s\\S]*?)<\\/style>\\s*/i'
- ,array($this, '_removeStyleCB')
- ,$this->_html);
-
- // remove HTML comments (not containing IE conditional comments).
- $this->_html = preg_replace_callback(
- '/<!--([\\s\\S]*?)-->/'
- ,array($this, '_commentCB')
- ,$this->_html);
-
- // replace PREs with placeholders
- $this->_html = preg_replace_callback('/\\s*<pre(\\b[^>]*?>[\\s\\S]*?<\\/pre>)\\s*/i'
- ,array($this, '_removePreCB')
- ,$this->_html);
-
- // replace TEXTAREAs with placeholders
- $this->_html = preg_replace_callback(
- '/\\s*<textarea(\\b[^>]*?>[\\s\\S]*?<\\/textarea>)\\s*/i'
- ,array($this, '_removeTextareaCB')
- ,$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|base(?:font)?|blockquote|body'
- .'|caption|center|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', $this->_html);
-
- // remove ws outside of all elements
- $this->_html = preg_replace(
- '/>(\\s(?:\\s*))?([^<]+)(\\s(?:\s*))?</'
- ,'>$1$2$3<'
- ,$this->_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
- );
- // issue 229: multi-pass to catch scripts that didn't get replaced in textareas
- $this->_html = str_replace(
- array_keys($this->_placeholders)
- ,array_values($this->_placeholders)
- ,$this->_html
- );
- return $this->_html;
- }
-
- protected function _commentCB($m)
- {
- return (0 === strpos($m[1], '[') || false !== strpos($m[1], '<!['))
- ? $m[0]
- : '';
- }
-
- protected function _reservePlace($content)
- {
- $placeholder = '%' . $this->_replacementHash . count($this->_placeholders) . '%';
- $this->_placeholders[$placeholder] = $content;
- return $placeholder;
- }
- protected $_isXhtml = null;
- protected $_replacementHash = null;
- protected $_placeholders = array();
- protected $_cssMinifier = null;
- protected $_jsMinifier = null;
- protected function _removePreCB($m)
- {
- return $this->_reservePlace("<pre{$m[1]}");
- }
-
- protected function _removeTextareaCB($m)
- {
- return $this->_reservePlace("<textarea{$m[1]}");
- }
- protected function _removeStyleCB($m)
- {
- $openStyle = "<style{$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}/*<![CDATA[*/{$css}/*]]>*/</style>"
- : "{$openStyle}{$css}</style>"
- );
- }
- protected function _removeScriptCB($m)
- {
- $openScript = "<script{$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)
- if ($this->_jsCleanComments) {
- $js = preg_replace('/(?:^\\s*<!--\\s*|\\s*(?:\\/\\/)?\\s*-->\\s*$)/', '', $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}{$openScript}/*<![CDATA[*/{$js}/*]]>*/</script>{$ws2}"
- : "{$ws1}{$openScript}{$js}</script>{$ws2}"
- );
- }
- protected function _removeCdata($str)
- {
- return (false !== strpos($str, '<![CDATA['))
- ? str_replace(array('<![CDATA[', ']]>'), '', $str)
- : $str;
- }
-
- protected function _needsCdata($str)
- {
- return ($this->_isXhtml && preg_match('/(?:[<&]|\\-\\-|\\]\\]>)/', $str));
- }
- }
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