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<?php |
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/** |
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* Class Minify_HTML |
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* @package Minify |
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*/ |
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|
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/** |
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* Compress HTML |
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* |
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* This is a heavy regex-based removal of whitespace, unnecessary comments and |
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* tokens. IE conditional comments are preserved. There are also options to have |
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* STYLE and SCRIPT blocks compressed by callback functions. |
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* |
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* A test suite is available. |
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* |
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* @package Minify |
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* @author Stephen Clay <steve@mrclay.org> |
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*/ |
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class Minify_HTML { |
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|
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/** |
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* "Minify" an HTML page |
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* |
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* @param string $html |
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* |
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* @param array $options |
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* |
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* 'cssMinifier' : (optional) callback function to process content of STYLE |
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* elements. |
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* |
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* 'jsMinifier' : (optional) callback function to process content of SCRIPT |
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* elements. Note: the type attribute is ignored. |
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* |
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* 'xhtml' : (optional boolean) should content be treated as XHTML1.0? If |
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* unset, minify will sniff for an XHTML doctype. |
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* |
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* @return string |
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*/ |
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public static function minify($html, $options = array()) { |
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$min = new Minify_HTML($html, $options); |
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return $min->process(); |
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} |
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|
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|
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/** |
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* Create a minifier object |
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* |
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* @param string $html |
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* |
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* @param array $options |
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* |
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* 'cssMinifier' : (optional) callback function to process content of STYLE |
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* elements. |
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* |
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* 'jsMinifier' : (optional) callback function to process content of SCRIPT |
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* elements. Note: the type attribute is ignored. |
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* |
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* 'xhtml' : (optional boolean) should content be treated as XHTML1.0? If |
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* unset, minify will sniff for an XHTML doctype. |
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* |
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* @return null |
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*/ |
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public function __construct($html, $options = array()) |
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{ |
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$this->_html = str_replace("\r\n", "\n", trim($html)); |
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if (isset($options['xhtml'])) { |
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$this->_isXhtml = (bool)$options['xhtml']; |
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} |
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if (isset($options['cssMinifier'])) { |
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$this->_cssMinifier = $options['cssMinifier']; |
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} |
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if (isset($options['jsMinifier'])) { |
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$this->_jsMinifier = $options['jsMinifier']; |
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} |
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} |
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|
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|
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/** |
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* Minify the markeup given in the constructor |
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* |
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* @return string |
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*/ |
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public function process() |
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{ |
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if ($this->_isXhtml === null) { |
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$this->_isXhtml = (false !== strpos($this->_html, '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML')); |
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} |
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|
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$this->_replacementHash = 'MINIFYHTML' . md5($_SERVER['REQUEST_TIME']); |
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$this->_placeholders = array(); |
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|
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// replace SCRIPTs (and minify) with placeholders |
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$this->_html = preg_replace_callback( |
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'/(\\s*)(<script\\b[^>]*?>)([\\s\\S]*?)<\\/script>(\\s*)/i' |
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,array($this, '_removeScriptCB') |
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,$this->_html); |
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|
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// replace STYLEs (and minify) with placeholders |
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$this->_html = preg_replace_callback( |
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'/\\s*(<style\\b[^>]*?>)([\\s\\S]*?)<\\/style>\\s*/i' |
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,array($this, '_removeStyleCB') |
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,$this->_html); |
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|
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// remove HTML comments (not containing IE conditional comments). |
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$this->_html = preg_replace_callback( |
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'/<!--([\\s\\S]*?)-->/' |
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,array($this, '_commentCB') |
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,$this->_html); |
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|
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// replace PREs with placeholders |
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$this->_html = preg_replace_callback('/\\s*(<pre\\b[^>]*?>[\\s\\S]*?<\\/pre>)\\s*/i' |
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,array($this, '_removePreCB') |
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,$this->_html); |
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|
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// replace TEXTAREAs with placeholders |
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$this->_html = preg_replace_callback( |
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'/\\s*(<textarea\\b[^>]*?>[\\s\\S]*?<\\/textarea>)\\s*/i' |
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,array($this, '_removeTextareaCB') |
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,$this->_html); |
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|
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// trim each line. |
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// @todo take into account attribute values that span multiple lines. |
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$this->_html = preg_replace('/^\\s+|\\s+$/m', '', $this->_html); |
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|
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// remove ws around block/undisplayed elements |
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$this->_html = preg_replace('/\\s+(<\\/?(?:area|base(?:font)?|blockquote|body' |
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.'|caption|center|cite|col(?:group)?|dd|dir|div|dl|dt|fieldset|form' |
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.'|frame(?:set)?|h[1-6]|head|hr|html|legend|li|link|map|menu|meta' |
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.'|ol|opt(?:group|ion)|p|param|t(?:able|body|head|d|h||r|foot|itle)' |
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.'|ul)\\b[^>]*>)/i', '$1', $this->_html); |
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|
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// remove ws outside of all elements |
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$this->_html = preg_replace_callback( |
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'/>([^<]+)</' |
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,array($this, '_outsideTagCB') |
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,$this->_html); |
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|
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// use newlines before 1st attribute in open tags (to limit line lengths) |
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$this->_html = preg_replace('/(<[a-z\\-]+)\\s+([^>]+>)/i', "$1\n$2", $this->_html); |
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|
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// fill placeholders |
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$this->_html = str_replace( |
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array_keys($this->_placeholders) |
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,array_values($this->_placeholders) |
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,$this->_html |
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); |
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return $this->_html; |
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} |
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|
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protected function _commentCB($m) |
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{ |
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return (0 === strpos($m[1], '[') || false !== strpos($m[1], '<![')) |
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? $m[0] |
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: ''; |
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} |
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|
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protected function _reservePlace($content) |
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{ |
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$placeholder = '%' . $this->_replacementHash . count($this->_placeholders) . '%'; |
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$this->_placeholders[$placeholder] = $content; |
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return $placeholder; |
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} |
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|
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protected $_isXhtml = null; |
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protected $_replacementHash = null; |
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protected $_placeholders = array(); |
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protected $_cssMinifier = null; |
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protected $_jsMinifier = null; |
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|
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protected function _outsideTagCB($m) |
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{ |
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return '>' . preg_replace('/^\\s+|\\s+$/', ' ', $m[1]) . '<'; |
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} |
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|
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protected function _removePreCB($m) |
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{ |
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return $this->_reservePlace($m[1]); |
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} |
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|
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protected function _removeTextareaCB($m) |
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{ |
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return $this->_reservePlace($m[1]); |
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} |
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|
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protected function _removeStyleCB($m) |
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{ |
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$openStyle = $m[1]; |
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$css = $m[2]; |
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// remove HTML comments |
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$css = preg_replace('/(?:^\\s*<!--|-->\\s*$)/', '', $css); |
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|
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// remove CDATA section markers |
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$css = $this->_removeCdata($css); |
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|
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// minify |
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$minifier = $this->_cssMinifier |
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? $this->_cssMinifier |
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: 'trim'; |
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$css = call_user_func($minifier, $css); |
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|
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return $this->_reservePlace($this->_needsCdata($css) |
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? "{$openStyle}/*<![CDATA[*/{$css}/*]]>*/</style>" |
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: "{$openStyle}{$css}</style>" |
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); |
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} |
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|
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protected function _removeScriptCB($m) |
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{ |
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$openScript = $m[2]; |
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$js = $m[3]; |
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|
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// whitespace surrounding? preserve at least one space |
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$ws1 = ($m[1] === '') ? '' : ' '; |
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$ws2 = ($m[4] === '') ? '' : ' '; |
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|
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// remove HTML comments (and ending "//" if present) |
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$js = preg_replace('/(?:^\\s*<!--\\s*|\\s*(?:\\/\\/)?\\s*-->\\s*$)/', '', $js); |
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|
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// remove CDATA section markers |
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$js = $this->_removeCdata($js); |
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|
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// minify |
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$minifier = $this->_jsMinifier |
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? $this->_jsMinifier |
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: 'trim'; |
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$js = call_user_func($minifier, $js); |
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|
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return $this->_reservePlace($this->_needsCdata($js) |
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? "{$ws1}{$openScript}/*<![CDATA[*/{$js}/*]]>*/</script>{$ws2}" |
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: "{$ws1}{$openScript}{$js}</script>{$ws2}" |
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); |
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} |
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|
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protected function _removeCdata($str) |
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{ |
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return (false !== strpos($str, '<![CDATA[')) |
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? str_replace(array('<![CDATA[', ']]>'), '', $str) |
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: $str; |
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} |
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|
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protected function _needsCdata($str) |
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{ |
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return ($this->_isXhtml && preg_match('/(?:[<&]|\\-\\-|\\]\\]>)/', $str)); |
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} |
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} |
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|
