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Editing: class.minify_html.php

<?php

/**
 * Class Minify_HTML
 * @package Minify
 */

/**
 * Surcharge du minifieur HTML
 * 
 * Surcharge pour ne pas manger les commentaires 
 * qui servent parfois aux plugins, et parfois même après
 * le passage du compacteur HTML
 * 
 * C'était le cas du bouton statistiques du formulaire admin par exemple
 *
 * On permet de conserver également tout commentaire commençant par 
 *
 * @package SPIP\Compresseur\Minifieur
**/
class Minify_HTML_SPIP extends Minify_HTML {

/**
     * {@inheritdoc}
     *
     *
     * @param string $html
     *     HTML à minifier
     * @param array $options
     *     Tableau d'option avec les index possibles 
     *     - 'cssMinifier' : (optional) callback function to process content of STYLE
     *        elements.
     *     - 'jsMinifier' : (optional) callback function to process content of SCRIPT
     *        elements. Note: the type attribute is ignored.
     *     - 'xhtml' : (optional boolean) should content be treated as XHTML1.0? If
     *        unset, minify will sniff for an XHTML doctype.
     * @return string
     *     HTML minifié
    **/
    public static function minify($html, $options = array()) {
        $min = new Minify_HTML_SPIP($html, $options);
        return $min->process();
    }

/**
     * Minification des commentaires
     * 
     * Le cas  doit être conservé dans les commentaires,
     * tout comme 
     *
     * @param array $m    Matches du preg_match d'un commentaire HTML
     * @return string     Contenu minifié
     */
    protected function _commentCB($m)
    {
        if ($m[1] === 'extra') return $m[0];
        if ($m[1] AND $m[1][0] === 'k' AND substr($m[1],0,7) === 'keepme:') return $m[0];
        return parent::_commentCB($m);
    }
}

/**
 * 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.
 * 
 * @link https://github.com/mrclay/minify/blob/master/min/lib/Minify/HTML.php
 * @version 9e4176f1
 * @note Librairie modifiée pour prendre en compte les attributs avec multilignes.
 *
 * @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).
        $this->_html = preg_replace_callback(
            '//'
            ,array($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);

// replace INPUTs with placeholders
        $this->_html = preg_replace_callback(
            '/\\s*<input(\\b[^>]*?>)\\s*/i'
            ,array($this, '_removeInputCB')
            ,$this->_html);

// trim each line.
        // @todo take into account attribute values that span multiple lines.
	      // 2 regexp because merging un /^\\s+|\\s+$/m also del a lot of newline chars ???
        $this->_html = preg_replace('/\\s+$/m', '', $this->_html);
        $this->_html = preg_replace('/^\\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 _removeInputCB($m)
		{
	     return $this->_reservePlace("<input{$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) {
            $js = preg_replace('/(?:^\\s*\\s*$)/', '', $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));
    }
}