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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 {
/**
* "Minify" an HTML page
*
* @param string $html
*
* @param array $options
*
* 'xhtml' : (optional boolean) should content be treated as XHTML1.0? If
* unset, minify will sniff for an XHTML doctype.
*
* @return string
*/
public static function minify($html, $options = array()) {
$min = new Minify_HTML($html, $options);
return $min->process();
}
/**
* Create a minifier object
*
* @param string $html
*
* @param array $options
*
* 'cssMinifier' : (optional) callback function to process content of STYLE
* elements.
*
* 'jsMinifier' : (optional) callback function to process content of SCRIPT
* elements. Note: the type attribute is ignored.
*
* 'xhtml' : (optional boolean) should content be treated as XHTML1.0? If
* unset, minify will sniff for an XHTML doctype.
*
* @return null
*/
public function __construct($html, $options = array())
{
$this->_html = str_replace("\r\n", "\n", trim($html));
if (isset($options['xhtml'])) {
$this->_isXhtml = (bool)$options['xhtml'];
}
$this->_stripCrlf = (isset($options['stripCrlf']) ? (boolean) $options['stripCrlf'] : false) ;
$this->_ignoredComments = (isset($options['ignoredComments']) ? (array) $options['ignoredComments'] : array());
}
/**
* Minify the markeup given in the constructor
*
* @return string
*/
public function process()
{
if ($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 dynamic tags
$this->_html = preg_replace_callback(
'~(<!--\s*m(func|clude)(.*)-->\s*<!--\s*/m(func|clude)\s*-->)~is'
,array($this, '_removeComment')
,$this->_html);
// 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
$this->_html = preg_replace_callback(
'/>([^<]+)</'
,array($this, '_outsideTagCB')
,$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", $this->_html);
if ($this->_stripCrlf) {
$this->_html = preg_replace("~[\r\n]+~", ' ', $this->_html);
} else {
$this->_html = preg_replace("~[\r\n]+~", "\n", $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], '<![') || $this->_ignoredComment($m[1]))
? $m[0]
: '';
}
protected function _ignoredComment($comment)
{
foreach ($this->_ignoredComments as $ignoredComment) {
if (stristr($comment, $ignoredComment) !== false) {
return true;
}
}
return false;
}
protected function _reservePlace($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 $_stripCrlf = null;
protected $_ignoredComments = null;
protected function _outsideTagCB($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 _removeStyleCB($m)
{
return $this->_reservePlace($m[1]);
}
protected function _removeScriptCB($m)
{
return $this->_reservePlace($m[1]);
}
protected function _removeCdata($str)
{
if (false !== strpos($str, '<![CDATA[')) {
$str = str_replace('//<![CDATA[', '', $str);
$str = str_replace('/*<![CDATA[*/', '', $str);
$str = str_replace('<![CDATA[', '', $str);
$str = str_replace('//]]>', '', $str);
$str = str_replace('/*]]>*/', '', $str);
$str = str_replace(']]>', '', $str);
}
return $str;
}
protected function _removeComment($m)
{
return $this->_reservePlace($m[1]);
}
protected function _needsCdata($str)
{
return ($this->_isXhtml && preg_match('/(?:[<&]|\\-\\-|\\]\\]>)/', $str));
}
}
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