forked from GNUsocial/gnu-social
246 lines
7.6 KiB
PHP
246 lines
7.6 KiB
PHP
<?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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* 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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* "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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* 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 = $options['jsMinifier'];
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}
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}
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/**
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* Minify the markeup given in the constructor
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*
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* @return string
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*/
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public function process()
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{
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if ($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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$this->_replacementHash = 'MINIFYHTML' . md5($_SERVER['REQUEST_TIME']);
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$this->_placeholders = array();
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// replace SCRIPTs (and minify) with placeholders
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$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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// 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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,$this->_html);
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// remove HTML comments (not containing IE conditional comments).
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$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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// 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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,$this->_html);
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// replace TEXTAREAs with placeholders
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$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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// 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', '', $this->_html);
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// remove ws around block/undisplayed elements
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$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', $this->_html);
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// remove ws outside of all elements
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$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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// 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", $this->_html);
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// fill placeholders
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$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 $this->_html;
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}
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protected function _commentCB($m)
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{
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return (0 === strpos($m[1], '[') || false !== strpos($m[1], '<!['))
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? $m[0]
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: '';
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}
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protected function _reservePlace($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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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 $_jsMinifier = null;
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protected function _outsideTagCB($m)
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{
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return '>' . preg_replace('/^\\s+|\\s+$/', ' ', $m[1]) . '<';
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}
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protected function _removePreCB($m)
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{
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return $this->_reservePlace($m[1]);
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}
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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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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*$)/', '', $css);
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// remove CDATA section markers
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$css = $this->_removeCdata($css);
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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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return $this->_reservePlace($this->_needsCdata($css)
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? "{$openStyle}/*<![CDATA[*/{$css}/*]]>*/</style>"
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: "{$openStyle}{$css}</style>"
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);
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}
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protected function _removeScriptCB($m)
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{
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$openScript = $m[2];
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$js = $m[3];
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// whitespace surrounding? preserve at least one space
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$ws1 = ($m[1] === '') ? '' : ' ';
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$ws2 = ($m[4] === '') ? '' : ' ';
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// remove HTML comments (and ending "//" if present)
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$js = preg_replace('/(?:^\\s*<!--\\s*|\\s*(?:\\/\\/)?\\s*-->\\s*$)/', '', $js);
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// remove CDATA section markers
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$js = $this->_removeCdata($js);
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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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return $this->_reservePlace($this->_needsCdata($js)
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? "{$ws1}{$openScript}/*<![CDATA[*/{$js}/*]]>*/</script>{$ws2}"
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: "{$ws1}{$openScript}{$js}</script>{$ws2}"
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);
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}
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protected function _removeCdata($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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: $str;
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}
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protected function _needsCdata($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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