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<?php
namespace JchOptimize;
/**
* Class HTML_Optimize
*/
/**
* 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.
*
* This class was modified from the original class Minify_HTML that was
* written by Stephen Clay <steve@mrclay.org>
*
* @author Samuel Marshall<sdmarshall73@gmail.com>
*/
class HTML_Optimize extends Optimize
{
protected $_isXhtml = false;
protected $_isHtml5 = false;
protected $_cssMinifier = null;
protected $_jsMinifier = null;
protected $_html = '';
protected $_minifyLevel = 0;
/**
* "Minify" an HTML page
*
* @param string $html
*
* @param array $options
*
* 'cssMinifier' : (optional) callback function to process content of STYLE
* elements.
*
* 'jsMinifier' : (optional) callback function to process content of SCRIPT
* elements. Note: the type attribute is ignored.
*
* 'xhtml' : (optional boolean) should content be treated as XHTML1.0? If
* unset, minify will sniff for an XHTML doctype.
*
* @return string
*/
public static function optimize($html, $options = array())
{
$min = new HTML_Optimize($html, $options);
return $min->_optimize();
}
/**
* 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 = $html;
foreach($options as $key => $value)
{
$this->{'_' . $key} = $value;
}
}
/**
* Minify the markeup given in the constructor
*
* @return string
*/
private function _optimize()
{
$x = '<!--(?>-?[^-]*+)*?--!?>';
$s1 = self::DOUBLE_QUOTE_STRING;
$s2 = self::SINGLE_QUOTE_STRING;
//Regex for escape elements
$pr = "<pre\b[^>]*+>(?><?[^<]*+)*?</pre>";
$sc = "<script\b[^>]*+>(?><?[^<]*+)*?</script>";
$st = "<style\b[^>]*+>(?><?[^<]*+)*?</style>";
$tx = "<textarea\b[^>]*+>(?><?[^<]*+)*?</textarea>";
if ($this->_minifyLevel > 0)
{
//Remove comments (not containing IE conditional comments)
$rx = "#(?><?[^<]*+(?>$pr|$sc|$st|$tx|<!--\[(?><?[^<]*+)*?"
. "<!\s*\[(?>-?[^-]*+)*?--!?>|<!DOCTYPE[^>]++>)?)*?\K(?:$x|$)#i";
$this->_html = $this->_replace($rx, '', $this->_html, '1');
$html = $this->_html;
}
//Reduce runs of whitespace outside all elements to one
$rx = "#(?>[^<]*+(?:$pr|$sc|$st|$tx|$x|<(?>[^>=]*+(?:=\s*+(?:$s1|$s2|['\"])?|(?=>)))*?>)?)*?\K"
. '(?:[\t\f ]++(?=[\r\n]\s*+<)|(?>\r?\n|\r)\K\s++(?=<)|[\t\f]++(?=[ ]\s*+<)|[\t\f]\K\s*+(?=<)|[ ]\K\s*+(?=<)|$)#i';
$this->_html = $this->_replace($rx, '', $this->_html, '2');
//Minify scripts
$rx = "#(?><?[^<]*+(?:$x)?)*?\K"
. "(?:(<script\b[^>]*+>)((?><?[^<]*+)*?)(</script>)|"
. "(<style\b[^>]*+>)((?><?[^<]*+)*?)(</style>)|$)#i";
$this->_html = $this->_replace($rx, '', $this->_html, '3', array($this, '_minifyCB'));
if ($this->_minifyLevel < 1)
{
return trim($this->_html);
}
//Replace line feed with space (legacy)
$rx = "#(?>[^<]*+(?:$pr|$sc|$st|$tx|$x|<(?>[^>=]*+(?:=\s*+(?:$s1|$s2|['\"])?|(?=>)))*?>)?)*?\K"
. '(?:[\r\n\t\f]++(?=<)|$)#i';
$this->_html = $this->_replace($rx, ' ', $this->_html, '4');
// remove ws around block elements preserving space around inline elements
//block/undisplayed elements
$b = 'address|article|aside|audio|body|blockquote|canvas|dd|div|dl'
. '|fieldset|figcaption|figure|footer|form|h[1-6]|head|header|hgroup|html|noscript|ol|output|p'
. '|pre|section|style|table|title|tfoot|ul|video';
//self closing block/undisplayed elements
$b2 = 'base|meta|link|hr';
//inline elements
$i = 'b|big|i|small|tt'
. '|abbr|acronym|cite|code|dfn|em|kbd|strong|samp|var'
. '|a|bdo|br|map|object|q|script|span|sub|sup'
. '|button|label|select|textarea';
//self closing inline elements
$i2 = 'img|input';
$rx = "#(?>\s*+(?:$pr|$sc|$st|$tx|$x|<(?:(?>$i)\b[^>]*+>|(?:/(?>$i)\b>|(?>$i2)\b[^>]*+>)\s*+)|<[^>]*+>)|[^<]++)*?\K"
. "(?:\s++(?=<(?>$b|$b2)\b)|(?:</(?>$b)\b>|<(?>$b2)\b[^>]*+>)\K\s++(?!<(?>$i|$i2)\b)|$)#i";
$this->_html = $this->_replace($rx, '', $this->_html, '5');
//Replace runs of whitespace inside elements with single space escaping pre, textarea, scripts and style elements
//elements to escape
$e = 'pre|script|style|textarea';
$rx = "#(?>[^<]*+(?:$pr|$sc|$st|$tx|$x|<[^>]++>[^<]*+))*?(?:(?:<(?!$e|!)[^>]*+>)?(?>\s?[^\s<]*+)*?\K\s{2,}|\K$)#i";
$this->_html = $this->_replace($rx, ' ', $this->_html, '6');
//Remove additional ws around attributes
$rx = "#(?>\s?(?>[^<>]*+(?:<!(?!DOCTYPE)(?>>?[^>]*+)*?>[^<>]*+)?<|(?=[^<>]++>)[^\s>'\"]++(?>$s1|$s2)?|[^<]*+))*?\K"
. "(?>\s\s++|$)#i";
$this->_html = $this->_replace($rx, ' ', $this->_html, '7');
if ($this->_minifyLevel < 2)
{
return trim($this->_html);
}
//remove redundant attributes
$rx = "#(?:(?=[^<>]++>)|(?><?[^<]*+(?>$x|<(?!(?:script|style|link)|/html>))?)*?"
. "<(?:(?:script|style|link)|/html>))(?>[ ]?[^ >]*+)*?\K"
. '(?: (?:type|language)=["\']?(?:(?:text|application)/(?:javascript|css)|javascript)["\']?|[^<]*+\K$)#i';
$this->_html = $this->_replace($rx, '', $this->_html, '8');
$j = '<input type="hidden" name="[0-9a-f]{32}" value="1" />';
//Remove quotes from selected attributes
if ($this->_isHtml5)
{
$ns1 = '"[^"\'`=<>\s]*+(?:[\'`=<>\s]|(?<=\\\\)")(?>(?:(?<=\\\\)")?[^"]*+)*?(?<!\\\\)"';
$ns2 = "'[^'\"`=<>\s]*+(?:[\"`=<>\s]|(?<=\\\\)')(?>(?:(?<=\\\\)')?[^']*+)*?(?<!\\\\)'";
$rx = "#(?:(?=[^>]*+>)|<[a-z0-9]++ )"
. "(?>[=]?[^=><]*+(?:=(?:$ns1|$ns2)|>(?>[^<]*+(?:$j|$x|<(?![a-z0-9]++ ))?)*?(?:<[a-z0-9]++ |$))?)*?"
. "(?:=\K([\"'])([^\"'`=<>\s]++)\g{1}[ ]?|\K$)#i";
$this->_html = $this->_replace($rx, '$2 ', $this->_html, '9');
}
//Remove last whitespace in open tag
$rx = "#(?>[^<]*+(?:$j|$x|<(?![a-z0-9]++))?)*?(?:<[a-z0-9]++(?>\s*+[^\s>]++)*?\K"
. "(?:\s*+(?=>)|(?<=[\"'])\s++(?=/>))|$\K)#i";
$this->_html = $this->_replace($rx, '', $this->_html, '10');
return trim($this->_html);
}
/**
*
* @param type $m
* @return type
*/
protected function _minifyCB($m)
{
if ($m[0] == '')
{
return $m[0];
}
$openTag = isset($m[1]) && $m[1] != '' ? $m[1] : (isset($m[4]) && $m[4] != '' ? $m[4] : '');
$content = isset($m[2]) && $m[2] != '' ? $m[2] : (isset($m[5]) && $m[5] != '' ? $m[5] : '');
$closeTag = isset($m[3]) && $m[3] != '' ? $m[3] : (isset($m[6]) && $m[6] != '' ? $m[6] : '');
if (trim($content) == '')
{
return $m[0];
}
$type = stripos($openTag, 'script') == 1 ? 'js' : 'css';
if ($this->{'_' . $type . 'Minifier'})
{
// remove HTML comments (and preceding "//" if present) and CDATA
$content = self::cleanScript($content, $type);
// minify
$content = $this->_callMinifier($this->{'_' . $type . 'Minifier'}, $content);
return $this->_needsCdata($content) ? "{$openTag}/*<![CDATA[*/{$content}/*]]>*/{$closeTag}" : "{$openTag}{$content}{$closeTag}";
}
else
{
return $m[0];
}
}
/**
*
* @param type $str
* @return type
*/
protected function _needsCdata($str)
{
return ($this->_isXhtml && preg_match('#(?:[<&]|\-\-|\]\]>)#', $str));
}
/**
*
* @param type $aFunc
* @param type $content
* @return type
*/
protected function _callMinifier($aFunc, $content)
{
$class = $aFunc[0];
$method = $aFunc[1];
return $class::$method($content);
}
/**
*
*/
public static function cleanScript($content, $type)
{
$s1 = self::DOUBLE_QUOTE_STRING;
$s2 = self::SINGLE_QUOTE_STRING;
$b = self::BLOCK_COMMENTS;
$l = self::LINE_COMMENTS;
$c = '(?:(?:<!--|-->)[^\r\n]*+)|(?:<!\[CDATA\[|\]\]>)';
if ($type == 'css')
{
return preg_replace(
"#(?>[<\]\-]?[^'\"<\]\-/]*+(?>$s1|$s2|$b|$l|/)?)*?\K(?:$c|$)#i", '', $content
);
}
else
{
$content = JS_Optimize::optimize($content, array('prepareOnly' => TRUE));
$r = $GLOBALS['REGEXP_LITERAL'];
return preg_replace(
"#(?>[<\]\-]?[^'\"<\]\-/]*+(?>$s1|$s2|$b|$l|$r|/)?)*?\K(?:$c|$)#i", '', $content
);
}
}
}