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<?php
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/*
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+-----------------------------------------------------------------------+
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| This file is part of the Roundcube Webmail client |
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| Copyright (C) 2008-2012, The Roundcube Dev Team |
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| Copyright (c) 2005-2007, Jon Abernathy <jon@chuggnutt.com> |
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| Licensed under the GNU General Public License version 3 or |
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| any later version with exceptions for skins & plugins. |
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| See the README file for a full license statement. |
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| |
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| PURPOSE: |
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| Converts HTML to formatted plain text (based on html2text class) |
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+-----------------------------------------------------------------------+
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| Author: Thomas Bruederli <roundcube@gmail.com> |
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| Author: Aleksander Machniak <alec@alec.pl> |
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| Author: Jon Abernathy <jon@chuggnutt.com> |
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+-----------------------------------------------------------------------+
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*/
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/**
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* Takes HTML and converts it to formatted, plain text.
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*
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* Thanks to Alexander Krug (http://www.krugar.de/) to pointing out and
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* correcting an error in the regexp search array. Fixed 7/30/03.
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*
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* Updated set_html() function's file reading mechanism, 9/25/03.
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*
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* Thanks to Joss Sanglier (http://www.dancingbear.co.uk/) for adding
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* several more HTML entity codes to the $search and $replace arrays.
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* Updated 11/7/03.
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*
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* Thanks to Darius Kasperavicius (http://www.dar.dar.lt/) for
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* suggesting the addition of $allowed_tags and its supporting function
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* (which I slightly modified). Updated 3/12/04.
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*
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* Thanks to Justin Dearing for pointing out that a replacement for the
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* <TH> tag was missing, and suggesting an appropriate fix.
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* Updated 8/25/04.
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*
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* Thanks to Mathieu Collas (http://www.myefarm.com/) for finding a
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* display/formatting bug in the _build_link_list() function: email
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* readers would show the left bracket and number ("[1") as part of the
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* rendered email address.
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* Updated 12/16/04.
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*
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* Thanks to Wojciech Bajon (http://histeria.pl/) for submitting code
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* to handle relative links, which I hadn't considered. I modified his
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* code a bit to handle normal HTTP links and MAILTO links. Also for
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* suggesting three additional HTML entity codes to search for.
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* Updated 03/02/05.
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*
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* Thanks to Jacob Chandler for pointing out another link condition
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* for the _build_link_list() function: "https".
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* Updated 04/06/05.
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*
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* Thanks to Marc Bertrand (http://www.dresdensky.com/) for
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* suggesting a revision to the word wrapping functionality; if you
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* specify a $width of 0 or less, word wrapping will be ignored.
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* Updated 11/02/06.
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*
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* *** Big housecleaning updates below:
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*
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* Thanks to Colin Brown (http://www.sparkdriver.co.uk/) for
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* suggesting the fix to handle </li> and blank lines (whitespace).
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* Christian Basedau (http://www.movetheweb.de/) also suggested the
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* blank lines fix.
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*
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* Special thanks to Marcus Bointon (http://www.synchromedia.co.uk/),
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* Christian Basedau, Norbert Laposa (http://ln5.co.uk/),
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* Bas van de Weijer, and Marijn van Butselaar
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* for pointing out my glaring error in the <th> handling. Marcus also
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* supplied a host of fixes.
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*
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* Thanks to Jeffrey Silverman (http://www.newtnotes.com/) for pointing
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* out that extra spaces should be compressed--a problem addressed with
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* Marcus Bointon's fixes but that I had not yet incorporated.
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*
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* Thanks to Daniel Schledermann (http://www.typoconsult.dk/) for
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* suggesting a valuable fix with <a> tag handling.
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*
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* Thanks to Wojciech Bajon (again!) for suggesting fixes and additions,
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* including the <a> tag handling that Daniel Schledermann pointed
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* out but that I had not yet incorporated. I haven't (yet)
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* incorporated all of Wojciech's changes, though I may at some
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* future time.
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*
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* *** End of the housecleaning updates. Updated 08/08/07.
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*/
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/**
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* Converts HTML to formatted plain text
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*
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* @package Framework
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* @subpackage Utils
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*/
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class rcube_html2text
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{
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/**
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* Contains the HTML content to convert.
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*
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* @var string $html
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*/
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protected $html;
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/**
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* Contains the converted, formatted text.
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*
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* @var string $text
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*/
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protected $text;
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/**
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* Maximum width of the formatted text, in columns.
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*
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* Set this value to 0 (or less) to ignore word wrapping
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* and not constrain text to a fixed-width column.
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*
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* @var integer $width
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*/
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protected $width = 70;
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/**
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* Target character encoding for output text
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*
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* @var string $charset
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*/
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protected $charset = 'UTF-8';
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/**
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* List of preg* regular expression patterns to search for,
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* used in conjunction with $replace.
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*
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* @var array $search
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* @see $replace
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*/
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protected $search = array(
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"/\r/", // Non-legal carriage return
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"/[\n\t]+/", // Newlines and tabs
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'/<head[^>]*>.*?<\/head>/i', // <head>
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'/<script[^>]*>.*?<\/script>/i', // <script>s -- which strip_tags supposedly has problems with
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'/<style[^>]*>.*?<\/style>/i', // <style>s -- which strip_tags supposedly has problems with
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'/<p[^>]*>/i', // <P>
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'/<br[^>]*>/i', // <br>
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'/<i[^>]*>(.*?)<\/i>/i', // <i>
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'/<em[^>]*>(.*?)<\/em>/i', // <em>
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'/(<ul[^>]*>|<\/ul>)/i', // <ul> and </ul>
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'/(<ol[^>]*>|<\/ol>)/i', // <ol> and </ol>
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'/<li[^>]*>(.*?)<\/li>/i', // <li> and </li>
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'/<li[^>]*>/i', // <li>
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'/<hr[^>]*>/i', // <hr>
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'/<div[^>]*>/i', // <div>
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'/(<table[^>]*>|<\/table>)/i', // <table> and </table>
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'/(<tr[^>]*>|<\/tr>)/i', // <tr> and </tr>
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'/<td[^>]*>(.*?)<\/td>/i', // <td> and </td>
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);
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/**
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* List of pattern replacements corresponding to patterns searched.
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*
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* @var array $replace
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* @see $search
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*/
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protected $replace = array(
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'', // Non-legal carriage return
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' ', // Newlines and tabs
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'', // <head>
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'', // <script>s -- which strip_tags supposedly has problems with
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'', // <style>s -- which strip_tags supposedly has problems with
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"\n\n", // <P>
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"\n", // <br>
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'_\\1_', // <i>
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'_\\1_', // <em>
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"\n\n", // <ul> and </ul>
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"\n\n", // <ol> and </ol>
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"\t* \\1\n", // <li> and </li>
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"\n\t* ", // <li>
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"\n-------------------------\n", // <hr>
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"<div>\n", // <div>
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"\n\n", // <table> and </table>
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"\n", // <tr> and </tr>
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"\t\t\\1\n", // <td> and </td>
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);
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/**
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* List of preg* regular expression patterns to search for,
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* used in conjunction with $ent_replace.
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*
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* @var array $ent_search
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* @see $ent_replace
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*/
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protected $ent_search = array(
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'/&(nbsp|#160);/i', // Non-breaking space
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'/&(quot|rdquo|ldquo|#8220|#8221|#147|#148);/i',
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// Double quotes
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'/&(apos|rsquo|lsquo|#8216|#8217);/i', // Single quotes
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'/>/i', // Greater-than
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'/</i', // Less-than
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'/&(copy|#169);/i', // Copyright
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'/&(trade|#8482|#153);/i', // Trademark
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'/&(reg|#174);/i', // Registered
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'/&(mdash|#151|#8212);/i', // mdash
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'/&(ndash|minus|#8211|#8722);/i', // ndash
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'/&(bull|#149|#8226);/i', // Bullet
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'/&(pound|#163);/i', // Pound sign
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'/&(euro|#8364);/i', // Euro sign
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'/&(amp|#38);/i', // Ampersand: see _converter()
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'/[ ]{2,}/', // Runs of spaces, post-handling
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);
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/**
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* List of pattern replacements corresponding to patterns searched.
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*
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* @var array $ent_replace
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* @see $ent_search
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*/
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protected $ent_replace = array(
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' ', // Non-breaking space
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'"', // Double quotes
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"'", // Single quotes
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'>',
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'<',
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'(c)',
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'(tm)',
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'(R)',
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'--',
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'-',
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'*',
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'£',
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'EUR', // Euro sign. <20> ?
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'|+|amp|+|', // Ampersand: see _converter()
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' ', // Runs of spaces, post-handling
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);
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/**
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* List of preg* regular expression patterns to search for
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* and replace using callback function.
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*
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* @var array $callback_search
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*/
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protected $callback_search = array(
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'/<(a) [^>]*href=("|\')([^"\']+)\2[^>]*>(.*?)<\/a>/i', // <a href="">
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'/<(h)[123456]( [^>]*)?>(.*?)<\/h[123456]>/i', // h1 - h6
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'/<(b)( [^>]*)?>(.*?)<\/b>/i', // <b>
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'/<(strong)( [^>]*)?>(.*?)<\/strong>/i', // <strong>
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'/<(th)( [^>]*)?>(.*?)<\/th>/i', // <th> and </th>
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);
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/**
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* List of preg* regular expression patterns to search for in PRE body,
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* used in conjunction with $pre_replace.
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*
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* @var array $pre_search
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* @see $pre_replace
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*/
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protected $pre_search = array(
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"/\n/",
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"/\t/",
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'/ /',
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'/<pre[^>]*>/',
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'/<\/pre>/'
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);
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/**
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* List of pattern replacements corresponding to patterns searched for PRE body.
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*
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* @var array $pre_replace
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* @see $pre_search
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*/
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protected $pre_replace = array(
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'<br>',
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' ',
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' ',
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'',
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''
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);
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/**
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* Contains a list of HTML tags to allow in the resulting text.
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*
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* @var string $allowed_tags
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* @see set_allowed_tags()
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*/
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protected $allowed_tags = '';
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/**
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* Contains the base URL that relative links should resolve to.
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*
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* @var string $url
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*/
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protected $url;
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/**
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* Indicates whether content in the $html variable has been converted yet.
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*
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* @var boolean $_converted
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* @see $html, $text
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*/
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protected $_converted = false;
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/**
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* Contains URL addresses from links to be rendered in plain text.
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*
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* @var array $_link_list
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* @see _build_link_list()
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*/
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protected $_link_list = array();
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/**
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* Boolean flag, true if a table of link URLs should be listed after the text.
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*
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* @var boolean $_do_links
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* @see __construct()
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*/
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protected $_do_links = true;
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/**
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* Constructor.
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*
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* If the HTML source string (or file) is supplied, the class
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* will instantiate with that source propagated, all that has
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* to be done it to call get_text().
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*
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* @param string $source HTML content
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* @param boolean $from_file Indicates $source is a file to pull content from
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* @param boolean $do_links Indicate whether a table of link URLs is desired
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* @param integer $width Maximum width of the formatted text, 0 for no limit
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*/
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function __construct($source = '', $from_file = false, $do_links = true, $width = 75, $charset = 'UTF-8')
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{
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if (!empty($source)) {
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$this->set_html($source, $from_file);
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}
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$this->set_base_url();
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$this->_do_links = $do_links;
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$this->width = $width;
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$this->charset = $charset;
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}
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/**
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* Loads source HTML into memory, either from $source string or a file.
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*
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* @param string $source HTML content
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* @param boolean $from_file Indicates $source is a file to pull content from
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*/
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function set_html($source, $from_file = false)
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{
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if ($from_file && file_exists($source)) {
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$this->html = file_get_contents($source);
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}
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else {
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$this->html = $source;
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}
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$this->_converted = false;
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}
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/**
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* Returns the text, converted from HTML.
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*
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* @return string Plain text
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*/
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function get_text()
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{
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if (!$this->_converted) {
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$this->_convert();
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}
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return $this->text;
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}
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/**
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* Prints the text, converted from HTML.
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*/
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function print_text()
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{
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print $this->get_text();
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}
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/**
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* Sets the allowed HTML tags to pass through to the resulting text.
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*
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* Tags should be in the form "<p>", with no corresponding closing tag.
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*/
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function set_allowed_tags($allowed_tags = '')
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{
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if (!empty($allowed_tags)) {
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$this->allowed_tags = $allowed_tags;
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}
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}
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/**
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* Sets a base URL to handle relative links.
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*/
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function set_base_url($url = '')
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{
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if (empty($url)) {
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if (!empty($_SERVER['HTTP_HOST'])) {
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$this->url = 'http://' . $_SERVER['HTTP_HOST'];
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}
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else {
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$this->url = '';
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}
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}
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else {
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// Strip any trailing slashes for consistency (relative
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// URLs may already start with a slash like "/file.html")
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if (substr($url, -1) == '/') {
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$url = substr($url, 0, -1);
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}
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$this->url = $url;
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}
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}
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/**
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* Workhorse function that does actual conversion (calls _converter() method).
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*/
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protected function _convert()
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{
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// Variables used for building the link list
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$this->_link_list = array();
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$text = $this->html;
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// Convert HTML to TXT
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$this->_converter($text);
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// Add link list
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if (!empty($this->_link_list)) {
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$text .= "\n\nLinks:\n------\n";
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foreach ($this->_link_list as $idx => $url) {
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$text .= '[' . ($idx+1) . '] ' . $url . "\n";
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}
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}
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$this->text = $text;
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$this->_converted = true;
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}
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/**
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* Workhorse function that does actual conversion.
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*
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* First performs custom tag replacement specified by $search and
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* $replace arrays. Then strips any remaining HTML tags, reduces whitespace
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* and newlines to a readable format, and word wraps the text to
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* $width characters.
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*
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* @param string Reference to HTML content string
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*/
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protected function _converter(&$text)
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{
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// Convert <BLOCKQUOTE> (before PRE!)
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$this->_convert_blockquotes($text);
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// Convert <PRE>
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$this->_convert_pre($text);
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// Run our defined tags search-and-replace
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$text = preg_replace($this->search, $this->replace, $text);
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// Run our defined tags search-and-replace with callback
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$text = preg_replace_callback($this->callback_search, array($this, 'tags_preg_callback'), $text);
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// Strip any other HTML tags
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$text = strip_tags($text, $this->allowed_tags);
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// Run our defined entities/characters search-and-replace
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$text = preg_replace($this->ent_search, $this->ent_replace, $text);
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// Replace known html entities
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$text = html_entity_decode($text, ENT_QUOTES, $this->charset);
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// Replace unicode nbsp to regular spaces
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$text = preg_replace('/\xC2\xA0/', ' ', $text);
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// Remove unknown/unhandled entities (this cannot be done in search-and-replace block)
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$text = preg_replace('/&([a-zA-Z0-9]{2,6}|#[0-9]{2,4});/', '', $text);
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// Convert "|+|amp|+|" into "&", need to be done after handling of unknown entities
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// This properly handles situation of "&quot;" in input string
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$text = str_replace('|+|amp|+|', '&', $text);
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// Bring down number of empty lines to 2 max
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$text = preg_replace("/\n\s+\n/", "\n\n", $text);
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$text = preg_replace("/[\n]{3,}/", "\n\n", $text);
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// remove leading empty lines (can be produced by eg. P tag on the beginning)
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$text = ltrim($text, "\n");
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// Wrap the text to a readable format
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// for PHP versions >= 4.0.2. Default width is 75
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// If width is 0 or less, don't wrap the text.
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if ( $this->width > 0 ) {
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$text = wordwrap($text, $this->width);
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}
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}
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/**
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* Helper function called by preg_replace() on link replacement.
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*
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* Maintains an internal list of links to be displayed at the end of the
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* text, with numeric indices to the original point in the text they
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* appeared. Also makes an effort at identifying and handling absolute
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* and relative links.
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*
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* @param string $link URL of the link
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* @param string $display Part of the text to associate number with
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*/
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protected function _build_link_list( $link, $display )
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{
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if (!$this->_do_links || empty($link)) {
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return $display;
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}
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// Ignored link types
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if (preg_match('!^(javascript:|mailto:|#)!i', $link)) {
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return $display;
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}
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if (preg_match('!^([a-z][a-z0-9.+-]+:)!i', $link)) {
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$url = $link;
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}
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else {
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$url = $this->url;
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if (substr($link, 0, 1) != '/') {
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$url .= '/';
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}
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$url .= "$link";
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}
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if (($index = array_search($url, $this->_link_list)) === false) {
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$index = count($this->_link_list);
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$this->_link_list[] = $url;
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}
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return $display . ' [' . ($index+1) . ']';
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}
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/**
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* Helper function for PRE body conversion.
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*
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* @param string HTML content
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*/
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protected function _convert_pre(&$text)
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{
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// get the content of PRE element
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while (preg_match('/<pre[^>]*>(.*)<\/pre>/ismU', $text, $matches)) {
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$this->pre_content = $matches[1];
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// Run our defined tags search-and-replace with callback
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$this->pre_content = preg_replace_callback($this->callback_search,
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array($this, 'tags_preg_callback'), $this->pre_content);
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// convert the content
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$this->pre_content = sprintf('<div><br>%s<br></div>',
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preg_replace($this->pre_search, $this->pre_replace, $this->pre_content));
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// replace the content (use callback because content can contain $0 variable)
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$text = preg_replace_callback('/<pre[^>]*>.*<\/pre>/ismU',
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array($this, 'pre_preg_callback'), $text, 1);
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// free memory
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$this->pre_content = '';
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}
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}
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/**
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* Helper function for BLOCKQUOTE body conversion.
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*
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* @param string HTML content
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*/
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protected function _convert_blockquotes(&$text)
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{
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$level = 0;
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$offset = 0;
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while (($start = strpos($text, '<blockquote', $offset)) !== false) {
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$offset = $start + 12;
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do {
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$end = strpos($text, '</blockquote>', $offset);
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$next = strpos($text, '<blockquote', $offset);
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// nested <blockquote>, skip
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if ($next !== false && $next < $end) {
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$offset = $next + 12;
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$level++;
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}
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// nested </blockquote> tag
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if ($end !== false && $level > 0) {
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$offset = $end + 12;
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$level--;
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}
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// found matching end tag
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else if ($end !== false && $level == 0) {
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$taglen = strpos($text, '>', $start) - $start;
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$startpos = $start + $taglen + 1;
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// get blockquote content
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$body = trim(substr($text, $startpos, $end - $startpos));
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// adjust text wrapping width
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$p_width = $this->width;
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if ($this->width > 0) $this->width -= 2;
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// replace content with inner blockquotes
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$this->_converter($body);
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// resore text width
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$this->width = $p_width;
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// Add citation markers and create <pre> block
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$body = preg_replace_callback('/((?:^|\n)>*)([^\n]*)/', array($this, 'blockquote_citation_callback'), trim($body));
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$body = '<pre>' . htmlspecialchars($body) . '</pre>';
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$text = substr_replace($text, $body . "\n", $start, $end + 13 - $start);
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$offset = 0;
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break;
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}
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// abort on invalid tag structure (e.g. no closing tag found)
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else {
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break;
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}
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}
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while ($end || $next);
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}
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}
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/**
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* Callback function to correctly add citation markers for blockquote contents
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*/
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public function blockquote_citation_callback($m)
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{
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$line = ltrim($m[2]);
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$space = $line[0] == '>' ? '' : ' ';
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return $m[1] . '>' . $space . $line;
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}
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/**
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* Callback function for preg_replace_callback use.
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*
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* @param array PREG matches
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* @return string
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*/
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public function tags_preg_callback($matches)
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{
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switch (strtolower($matches[1])) {
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case 'b':
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case 'strong':
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return $this->_toupper($matches[3]);
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case 'th':
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return $this->_toupper("\t\t". $matches[3] ."\n");
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case 'h':
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return $this->_toupper("\n\n". $matches[3] ."\n\n");
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case 'a':
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// Remove spaces in URL (#1487805)
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$url = str_replace(' ', '', $matches[3]);
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return $this->_build_link_list($url, $matches[4]);
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}
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}
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/**
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* Callback function for preg_replace_callback use in PRE content handler.
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*
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* @param array PREG matches
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* @return string
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*/
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public function pre_preg_callback($matches)
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{
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return $this->pre_content;
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}
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/**
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* Strtoupper function with HTML tags and entities handling.
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*
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* @param string $str Text to convert
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* @return string Converted text
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*/
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private function _toupper($str)
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{
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// string can containg HTML tags
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$chunks = preg_split('/(<[^>]*>)/', $str, null, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE);
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// convert toupper only the text between HTML tags
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foreach ($chunks as $idx => $chunk) {
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if ($chunk[0] != '<') {
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$chunks[$idx] = $this->_strtoupper($chunk);
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}
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}
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return implode($chunks);
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}
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/**
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* Strtoupper multibyte wrapper function with HTML entities handling.
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*
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* @param string $str Text to convert
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* @return string Converted text
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*/
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private function _strtoupper($str)
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{
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$str = html_entity_decode($str, ENT_COMPAT, $this->charset);
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$str = mb_strtoupper($str);
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$str = htmlspecialchars($str, ENT_COMPAT, $this->charset);
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return $str;
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}
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}
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