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/*************************************************************************
 *                                                                       *
 * Converts HTML to formatted plain text                                 *
 *                                                                       *
 * Portions Copyright (c) 2005-2007 Jon Abernathy &lt;jon@chuggnutt.com&gt;    *
 *                                                                       *
 * This script is free software; you can redistribute it and/or modify   *
 * it under the terms of the GNU General Public License as published by  *
 * the Free Software Foundation; either version 2 of the License, or     *
 * (at your option) any later version.                                   *
 *                                                                       *
 * The GNU General Public License can be found at                        *
 * http://www.gnu.org/copyleft/gpl.html.                                 *
 *                                                                       *
 * This script is distributed in the hope that it will be useful,        *
 * but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the          *
 * GNU General Public License for more details.                          *
 *                                                                       *
 *************************************************************************/

/**
 * Converts HTML to formatted plain text
 */
class Html2Text
{
    /**
     * Contains the HTML content to convert.
     *
     * @type string
     */
    protected $html;

    /**
     * Contains the converted, formatted text.
     *
     * @type string
     */
    protected $text;

    /**
     * Maximum width of the formatted text, in columns.
     *
     * Set this value to 0 (or less) to ignore word wrapping
     * and not constrain text to a fixed-width column.
     *
     * @type integer
     */
    protected $width = 70;

    /**
     * List of preg* regular expression patterns to search for,
     * used in conjunction with $replace.
     *
     * @type array
     * @see $replace
     */
    protected $search = array(
        &quot;/\r/&quot;,                                  // Non-legal carriage return
        &quot;/[\n\t]+/&quot;,                             // Newlines and tabs
        '/&lt;head[^&gt;]*&gt;.*?&lt;\/head&gt;/i',             // &lt;head&gt;
        '/&lt;script[^&gt;]*&gt;.*?&lt;\/script&gt;/i',         // &lt;script&gt;s -- which strip_tags supposedly has problems with
        '/&lt;style[^&gt;]*&gt;.*?&lt;\/style&gt;/i',           // &lt;style&gt;s -- which strip_tags supposedly has problems with
        '/&lt;p[^&gt;]*&gt;/i',                           // &lt;P&gt;
        '/&lt;br[^&gt;]*&gt;/i',                          // &lt;br&gt;
        '/&lt;i[^&gt;]*&gt;(.*?)&lt;\/i&gt;/i',                 // &lt;i&gt;
        '/&lt;em[^&gt;]*&gt;(.*?)&lt;\/em&gt;/i',               // &lt;em&gt;
        '/(&lt;ul[^&gt;]*&gt;|&lt;\/ul&gt;)/i',                 // &lt;ul&gt; and &lt;/ul&gt;
        '/(&lt;ol[^&gt;]*&gt;|&lt;\/ol&gt;)/i',                 // &lt;ol&gt; and &lt;/ol&gt;
        '/(&lt;dl[^&gt;]*&gt;|&lt;\/dl&gt;)/i',                 // &lt;dl&gt; and &lt;/dl&gt;
        '/&lt;li[^&gt;]*&gt;(.*?)&lt;\/li&gt;/i',               // &lt;li&gt; and &lt;/li&gt;
        '/&lt;dd[^&gt;]*&gt;(.*?)&lt;\/dd&gt;/i',               // &lt;dd&gt; and &lt;/dd&gt;
        '/&lt;dt[^&gt;]*&gt;(.*?)&lt;\/dt&gt;/i',               // &lt;dt&gt; and &lt;/dt&gt;
        '/&lt;li[^&gt;]*&gt;/i',                          // &lt;li&gt;
        '/&lt;hr[^&gt;]*&gt;/i',                          // &lt;hr&gt;
        '/&lt;div[^&gt;]*&gt;/i',                         // &lt;div&gt;
        '/(&lt;table[^&gt;]*&gt;|&lt;\/table&gt;)/i',           // &lt;table&gt; and &lt;/table&gt;
        '/(&lt;tr[^&gt;]*&gt;|&lt;\/tr&gt;)/i',                 // &lt;tr&gt; and &lt;/tr&gt;
        '/&lt;td[^&gt;]*&gt;(.*?)&lt;\/td&gt;/i',               // &lt;td&gt; and &lt;/td&gt;
        '/&lt;span class=&quot;_html2text_ignore&quot;&gt;.+?&lt;\/span&gt;/i'  // &lt;span class=&quot;_html2text_ignore&quot;&gt;...&lt;/span&gt;
    );

    /**
     * List of pattern replacements corresponding to patterns searched.
     *
     * @type array
     * @see $search
     */
    protected $replace = array(
        '',                                     // Non-legal carriage return
        ' ',                                    // Newlines and tabs
        '',                                     // &lt;head&gt;
        '',                                     // &lt;script&gt;s -- which strip_tags supposedly has problems with
        '',                                     // &lt;style&gt;s -- which strip_tags supposedly has problems with
        &quot;\n\n&quot;,                                 // &lt;P&gt;
        &quot;\n&quot;,                                   // &lt;br&gt;
        '_\\1_',                                // &lt;i&gt;
        '_\\1_',                                // &lt;em&gt;
        &quot;\n\n&quot;,                                 // &lt;ul&gt; and &lt;/ul&gt;
        &quot;\n\n&quot;,                                 // &lt;ol&gt; and &lt;/ol&gt;
        &quot;\n\n&quot;,                                 // &lt;dl&gt; and &lt;/dl&gt;
        &quot;\t* \\1\n&quot;,                            // &lt;li&gt; and &lt;/li&gt;
        &quot; \\1\n&quot;,                               // &lt;dd&gt; and &lt;/dd&gt;
        &quot;\t* \\1&quot;,                              // &lt;dt&gt; and &lt;/dt&gt;
        &quot;\n\t* &quot;,                               // &lt;li&gt;
        &quot;\n-------------------------\n&quot;,        // &lt;hr&gt;
        &quot;&lt;div&gt;\n&quot;,                              // &lt;div&gt;
        &quot;\n\n&quot;,                                 // &lt;table&gt; and &lt;/table&gt;
        &quot;\n&quot;,                                   // &lt;tr&gt; and &lt;/tr&gt;
        &quot;\t\t\\1\n&quot;,                            // &lt;td&gt; and &lt;/td&gt;
        &quot;&quot;                                      // &lt;span class=&quot;_html2text_ignore&quot;&gt;...&lt;/span&gt;
    );

    /**
     * List of preg* regular expression patterns to search for,
     * used in conjunction with $ent_replace.
     *
     * @type array
     * @see $ent_replace
     */
    protected $ent_search = array(
        '/&amp;(nbsp|#160);/i',                      // Non-breaking space
        '/&amp;(quot|rdquo|ldquo|#8220|#8221|#147|#148);/i',
        // Double quotes
        '/&amp;(apos|rsquo|lsquo|#8216|#8217);/i',   // Single quotes
        '/&amp;gt;/i',                               // Greater-than
        '/&amp;lt;/i',                               // Less-than
        '/&amp;(copy|#169);/i',                      // Copyright
        '/&amp;(trade|#8482|#153);/i',               // Trademark
        '/&amp;(reg|#174);/i',                       // Registered
        '/&amp;(mdash|#151|#8212);/i',               // mdash
        '/&amp;(ndash|minus|#8211|#8722);/i',        // ndash
        '/&amp;(bull|#149|#8226);/i',                // Bullet
        '/&amp;(pound|#163);/i',                     // Pound sign
        '/&amp;(euro|#8364);/i',                     // Euro sign
        '/&amp;(amp|#38);/i',                        // Ampersand: see _converter()
        '/[ ]{2,}/',                             // Runs of spaces, post-handling
    );

    /**
     * List of pattern replacements corresponding to patterns searched.
     *
     * @type array
     * @see $ent_search
     */
    protected $ent_replace = array(
        ' ',                                    // Non-breaking space
        '&quot;',                                    // Double quotes
        &quot;'&quot;,                                    // Single quotes
        '&gt;',
        '&lt;',
        '(c)',
        '(tm)',
        '(R)',
        '--',
        '-',
        '*',
        '£',
        'EUR',                                  // Euro sign. € ?
        '|+|amp|+|',                            // Ampersand: see _converter()
        ' ',                                    // Runs of spaces, post-handling
    );

    /**
     * List of preg* regular expression patterns to search for
     * and replace using callback function.
     *
     * @type array
     */
    protected $callback_search = array(
        '/&lt;(a) [^&gt;]*href=(&quot;|\')([^&quot;\']+)\2([^&gt;]*)&gt;(.*?)&lt;\/a&gt;/i', // &lt;a href=&quot;&quot;&gt;
        '/&lt;(h)[123456]( [^&gt;]*)?&gt;(.*?)&lt;\/h[123456]&gt;/i',           // h1 - h6
        '/&lt;(b)( [^&gt;]*)?&gt;(.*?)&lt;\/b&gt;/i',                           // &lt;b&gt;
        '/&lt;(strong)( [^&gt;]*)?&gt;(.*?)&lt;\/strong&gt;/i',                 // &lt;strong&gt;
        '/&lt;(th)( [^&gt;]*)?&gt;(.*?)&lt;\/th&gt;/i',                         // &lt;th&gt; and &lt;/th&gt;
    );

    /**
     * List of preg* regular expression patterns to search for in PRE body,
     * used in conjunction with $pre_replace.
     *
     * @type array
     * @see $pre_replace
     */
    protected $pre_search = array(
        &quot;/\n/&quot;,
        &quot;/\t/&quot;,
        '/ /',
        '/&lt;pre[^&gt;]*&gt;/',
        '/&lt;\/pre&gt;/'
    );

    /**
     * List of pattern replacements corresponding to patterns searched for PRE body.
     *
     * @type array
     * @see $pre_search
     */
    protected $pre_replace = array(
        '&lt;br&gt;',
        '&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;',
        '&amp;nbsp;',
        '',
        ''
    );

    /**
     * Temporary workspace used during PRE processing.
     *
     * @type string
     */
    protected $pre_content = '';

    /**
     * Contains a list of HTML tags to allow in the resulting text.
     *
     * @type string
     * @see set_allowed_tags()
     */
    protected $allowed_tags = '';

    /**
     * Contains the base URL that relative links should resolve to.
     *
     * @type string
     */
    protected $url;

    /**
     * Indicates whether content in the $html variable has been converted yet.
     *
     * @type boolean
     * @see $html, $text
     */
    protected $_converted = false;

    /**
     * Contains URL addresses from links to be rendered in plain text.
     *
     * @type array
     * @see _build_link_list()
     */
    protected $_link_list = array();

    /**
     * Various configuration options (able to be set in the constructor)
     *
     * @type array
     */
    protected $_options = array(
        // 'none'
        // 'inline' (show links inline)
        // 'nextline' (show links on the next line)
        // 'table' (if a table of link URLs should be listed after the text.
        'do_links' =&gt; 'inline',
        //  Maximum width of the formatted text, in columns.
        //  Set this value to 0 (or less) to ignore word wrapping
        //  and not constrain text to a fixed-width column.
        'width' =&gt; 70,
    );

    /**
     * Constructor.
     *
     * If the HTML source string (or file) is supplied, the class
     * will instantiate with that source propagated, all that has
     * to be done it to call get_text().
     *
     * @param string $source HTML content
     * @param boolean $from_file Indicates $source is a file to pull content from
     * @param array $options Set configuration options
     */
    public function __construct($source = '', $from_file = false, $options = array())
    {
        $this-&gt;_options = array_merge($this-&gt;_options, $options);

        if (!empty($source)) {
            $this-&gt;set_html($source, $from_file);
        }

        $this-&gt;set_base_url();
    }

    /**
     * Loads source HTML into memory, either from $source string or a file.
     *
     * @param string $source HTML content
     * @param boolean $from_file Indicates $source is a file to pull content from
     */
    public function set_html($source, $from_file = false)
    {
        if ($from_file &amp;&amp; file_exists($source)) {
            $this-&gt;html = file_get_contents($source);
        } else {
            $this-&gt;html = $source;
        }

        $this-&gt;_converted = false;
    }

    /**
     * Returns the text, converted from HTML.
     *
     * @return string
     */
    public function get_text()
    {
        if (!$this-&gt;_converted) {
            $this-&gt;_convert();
        }

        return $this-&gt;text;
    }

    /**
     * Prints the text, converted from HTML.
     */
    public function print_text()
    {
        print $this-&gt;get_text();
    }

    /**
     * Alias to print_text(), operates identically.
     *
     * @see print_text()
     */
    public function p()
    {
        print $this-&gt;get_text();
    }

    /**
     * Sets the allowed HTML tags to pass through to the resulting text.
     *
     * Tags should be in the form &quot;&lt;p&gt;&quot;, with no corresponding closing tag.
     * @param string $allowed_tags
     */
    public function set_allowed_tags($allowed_tags = '')
    {
        if (!empty($allowed_tags)) {
            $this-&gt;allowed_tags = $allowed_tags;
        }
    }

    /**
     * Sets a base URL to handle relative links.
     *
     * @param string $url
     */
    public function set_base_url($url = '')
    {
        if (empty($url)) {
            if (!empty($_SERVER['HTTP_HOST'])) {
                $this-&gt;url = 'http://' . $_SERVER['HTTP_HOST'];
            } else {
                $this-&gt;url = '';
            }
        } else {
            // Strip any trailing slashes for consistency (relative
            // URLs may already start with a slash like &quot;/file.html&quot;)
            if (substr($url, -1) == '/') {
                $url = substr($url, 0, -1);
            }
            $this-&gt;url = $url;
        }
    }

    /**
     * Workhorse function that does actual conversion (calls _converter() method).
     */
    protected function _convert()
    {
        // Variables used for building the link list
        $this-&gt;_link_list = array();

        $text = trim(stripslashes($this-&gt;html));

        // Convert HTML to TXT
        $this-&gt;_converter($text);

        // Add link list
        if (!empty($this-&gt;_link_list)) {
            $text .= &quot;\n\nLinks:\n------\n&quot;;
            foreach ($this-&gt;_link_list as $idx =&gt; $url) {
                $text .= '[' . ($idx + 1) . '] ' . $url . &quot;\n&quot;;
            }
        }

        $this-&gt;text = $text;

        $this-&gt;_converted = true;
    }

    /**
     * Workhorse function that does actual conversion.
     *
     * First performs custom tag replacement specified by $search and
     * $replace arrays. Then strips any remaining HTML tags, reduces whitespace
     * and newlines to a readable format, and word wraps the text to
     * $this-&gt;_options['width'] characters.
     *
     * @param string $text Reference to HTML content string
     */
    protected function _converter(&amp;$text)
    {
        // Convert &lt;BLOCKQUOTE&gt; (before PRE!)
        $this-&gt;_convert_blockquotes($text);

        // Convert &lt;PRE&gt;
        $this-&gt;_convert_pre($text);

        // Run our defined tags search-and-replace
        $text = preg_replace($this-&gt;search, $this-&gt;replace, $text);

        // Run our defined tags search-and-replace with callback
        $text = preg_replace_callback($this-&gt;callback_search, array($this, '_preg_callback'), $text);

        // Strip any other HTML tags
        $text = strip_tags($text, $this-&gt;allowed_tags);

        // Run our defined entities/characters search-and-replace
        $text = preg_replace($this-&gt;ent_search, $this-&gt;ent_replace, $text);

        // Replace known html entities
        $text = html_entity_decode($text, ENT_QUOTES);

        // Remove unknown/unhandled entities (this cannot be done in search-and-replace block)
        $text = preg_replace('/&amp;([a-zA-Z0-9]{2,6}|#[0-9]{2,4});/', '', $text);

        // Convert &quot;|+|amp|+|&quot; into &quot;&amp;&quot;, need to be done after handling of unknown entities
        // This properly handles situation of &quot;&amp;amp;quot;&quot; in input string
        $text = str_replace('|+|amp|+|', '&amp;', $text);

        // Bring down number of empty lines to 2 max
        $text = preg_replace(&quot;/\n\s+\n/&quot;, &quot;\n\n&quot;, $text);
        $text = preg_replace(&quot;/[\n]{3,}/&quot;, &quot;\n\n&quot;, $text);

        // remove leading empty lines (can be produced by eg. P tag on the beginning)
        $text = ltrim($text, &quot;\n&quot;);

        // Wrap the text to a readable format
        // for PHP versions &gt;= 4.0.2. Default width is 75
        // If width is 0 or less, don't wrap the text.
        if ($this-&gt;_options['width'] &gt; 0) {
            $text = wordwrap($text, $this-&gt;_options['width']);
        }
    }

    /**
     * Helper function called by preg_replace() on link replacement.
     *
     * Maintains an internal list of links to be displayed at the end of the
     * text, with numeric indices to the original point in the text they
     * appeared. Also makes an effort at identifying and handling absolute
     * and relative links.
     *
     * @param string $link URL of the link
     * @param string $display Part of the text to associate number with
     * @param null $link_override
     * @return string
     */
    protected function _build_link_list($link, $display, $link_override = null)
    {
        $link_method = ($link_override) ? $link_override : $this-&gt;_options['do_links'];
        if ($link_method == 'none') {
            return $display;
        }


        // Ignored link types
        if (preg_match('!^(javascript:|mailto:|#)!i', $link)) {
            return $display;
        }

        if (preg_match('!^([a-z][a-z0-9.+-]+:)!i', $link)) {
            $url = $link;
        } else {
            $url = $this-&gt;url;
            if (substr($link, 0, 1) != '/') {
                $url .= '/';
            }
            $url .= &quot;$link&quot;;
        }

        if ($link_method == 'table') {
            if (($index = array_search($url, $this-&gt;_link_list)) === false) {
                $index = count($this-&gt;_link_list);
                $this-&gt;_link_list[] = $url;
            }

            return $display . ' [' . ($index + 1) . ']';
        } elseif ($link_method == 'nextline') {
            return $display . &quot;\n[&quot; . $url . ']';
        } else { // link_method defaults to inline

            return $display . ' [' . $url . ']';
        }
    }

    /**
     * Helper function for PRE body conversion.
     *
     * @param string $text HTML content
     */
    protected function _convert_pre(&amp;$text)
    {
        // get the content of PRE element
        while (preg_match('/&lt;pre[^&gt;]*&gt;(.*)&lt;\/pre&gt;/ismU', $text, $matches)) {
            $this-&gt;pre_content = $matches[1];

            // Run our defined tags search-and-replace with callback
            $this-&gt;pre_content = preg_replace_callback(
                $this-&gt;callback_search,
                array($this, '_preg_callback'),
                $this-&gt;pre_content
            );

            // convert the content
            $this-&gt;pre_content = sprintf(
                '&lt;div&gt;&lt;br&gt;%s&lt;br&gt;&lt;/div&gt;',
                preg_replace($this-&gt;pre_search, $this-&gt;pre_replace, $this-&gt;pre_content)
            );

            // replace the content (use callback because content can contain $0 variable)
            $text = preg_replace_callback(
                '/&lt;pre[^&gt;]*&gt;.*&lt;\/pre&gt;/ismU',
                array($this, '_preg_pre_callback'),
                $text,
                1
            );

            // free memory
            $this-&gt;pre_content = '';
        }
    }

    /**
     * Helper function for BLOCKQUOTE body conversion.
     *
     * @param string $text HTML content
     */
    protected function _convert_blockquotes(&amp;$text)
    {
        if (preg_match_all('/&lt;\/*blockquote[^&gt;]*&gt;/i', $text, $matches, PREG_OFFSET_CAPTURE)) {
            $start = 0;
            $taglen = 0;
            $level = 0;
            $diff = 0;
            foreach ($matches[0] as $m) {
                if ($m[0][0] == '&lt;' &amp;&amp; $m[0][1] == '/') {
                    $level--;
                    if ($level &lt; 0) {
                        $level = 0; // malformed HTML: go to next blockquote
                    } elseif ($level &gt; 0) {
                        // skip inner blockquote
                    } else {
                        $end = $m[1];
                        $len = $end - $taglen - $start;
                        // Get blockquote content
                        $body = substr($text, $start + $taglen - $diff, $len);

                        // Set text width
                        $p_width = $this-&gt;_options['width'];
                        if ($this-&gt;_options['width'] &gt; 0) $this-&gt;_options['width'] -= 2;
                        // Convert blockquote content
                        $body = trim($body);
                        $this-&gt;_converter($body);
                        // Add citation markers and create PRE block
                        $body = preg_replace('/((^|\n)&gt;*)/', '\\1&gt; ', trim($body));
                        $body = '&lt;pre&gt;' . htmlspecialchars($body) . '&lt;/pre&gt;';
                        // Re-set text width
                        $this-&gt;_options['width'] = $p_width;
                        // Replace content
                        $text = substr($text, 0, $start - $diff)
                            . $body . substr($text, $end + strlen($m[0]) - $diff);

                        $diff = $len + $taglen + strlen($m[0]) - strlen($body);
                        unset($body);
                    }
                } else {
                    if ($level == 0) {
                        $start = $m[1];
                        $taglen = strlen($m[0]);
                    }
                    $level++;
                }
            }
        }
    }

    /**
     * Callback function for preg_replace_callback use.
     *
     * @param array $matches PREG matches
     * @return string
     */
    protected function _preg_callback($matches)
    {
        switch (strtolower($matches[1])) {
            case 'b':
            case 'strong':
                return $this-&gt;_toupper($matches[3]);
            case 'th':
                return $this-&gt;_toupper(&quot;\t\t&quot; . $matches[3] . &quot;\n&quot;);
            case 'h':
                return $this-&gt;_toupper(&quot;\n\n&quot; . $matches[3] . &quot;\n\n&quot;);
            case 'a':
                // override the link method
                $link_override = null;
                if (preg_match('/_html2text_link_(\w+)/', $matches[4], $link_override_match)) {
                    $link_override = $link_override_match[1];
                }
                // Remove spaces in URL (#1487805)
                $url = str_replace(' ', '', $matches[3]);

                return $this-&gt;_build_link_list($url, $matches[5], $link_override);
        }
        return '';
    }

    /**
     * Callback function for preg_replace_callback use in PRE content handler.
     *
     * @param array $matches PREG matches
     * @return string
     */
    protected function _preg_pre_callback(
        /** @noinspection PhpUnusedParameterInspection */
        $matches)
    {
        return $this-&gt;pre_content;
    }

    /**
     * Strtoupper function with HTML tags and entities handling.
     *
     * @param string $str Text to convert
     * @return string Converted text
     */
    private function _toupper($str)
    {
        // string can contain HTML tags
        $chunks = preg_split('/(&lt;[^&gt;]*&gt;)/', $str, null, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE);

        // convert toupper only the text between HTML tags
        foreach ($chunks as $idx =&gt; $chunk) {
            if ($chunk[0] != '&lt;') {
                $chunks[$idx] = $this-&gt;_strtoupper($chunk);
            }
        }

        return implode($chunks);
    }

    /**
     * Strtoupper multibyte wrapper function with HTML entities handling.
     * Forces mb_strtoupper-call to UTF-8.
     *
     * @param string $str Text to convert
     * @return string Converted text
     */
    private function _strtoupper($str)
    {
        $str = html_entity_decode($str, ENT_COMPAT);

        if (function_exists('mb_strtoupper'))
            $str = mb_strtoupper($str, 'UTF-8');
        else
            $str = strtoupper($str);

        $str = htmlspecialchars($str, ENT_COMPAT);

        return $str;
    }
}
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