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<?php
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/*************************************************************************
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* *
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* class.html2text.inc *
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* *
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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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* Copyright (c) 2005-2007 Jon Abernathy <jon@chuggnutt.com> *
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* All rights reserved. *
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* *
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* This script is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* The GNU General Public License can be found at *
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* http://www.gnu.org/copyleft/gpl.html. *
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* *
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* This script is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* Author(s): Jon Abernathy <jon@chuggnutt.com> *
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* *
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* Last modified: 08/08/07 *
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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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* @author Jon Abernathy <jon@chuggnutt.com>
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* @version 1.0.0
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* @since PHP 4.0.2
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*/
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class 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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* @access public
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*/
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var $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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* @access public
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*/
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var $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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* @access public
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*/
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var $width = 70;
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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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* @access public
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* @see $replace
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*/
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var $search = array(
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"/\r/", // Non-legal carriage return
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"/[\n\t]+/", // Newlines and tabs
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'/[ ]{2,}/', // Runs of spaces, pre-handling
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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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'/&(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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'/&(amp|#38);/i', // Ampersand
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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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'/[ ]{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 $replace
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* @access public
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* @see $search
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*/
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var $replace = array(
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'', // Non-legal carriage return
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' ', // Newlines and tabs
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' ', // Runs of spaces, pre-handling
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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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' ', // 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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'&',
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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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' ' // 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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* @access public
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*/
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var $callback_search = array(
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'/<(h)[123456][^>]*>(.*?)<\/h[123456]>/i', // H1 - H3
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'/<(b)[^>]*>(.*?)<\/b>/i', // <b>
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'/<(strong)[^>]*>(.*?)<\/strong>/i', // <strong>
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'/<(a) [^>]*href=("|\')([^"\']+)\2[^>]*>(.*?)<\/a>/i',
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// <a href="">
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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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* @access public
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* @see $pre_replace
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*/
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var $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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* @access public
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* @see $pre_search
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*/
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var $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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* @access public
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* @see set_allowed_tags()
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*/
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var $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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* @access public
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*/
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var $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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* @access private
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* @see $html, $text
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*/
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var $_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 string $_link_list
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* @access private
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* @see _build_link_list()
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*/
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var $_link_list = '';
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/**
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* Number of valid links detected in the text, used for plain text
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* display (rendered similar to footnotes).
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*
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* @var integer $_link_count
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* @access private
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* @see _build_link_list()
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*/
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var $_link_count = 0;
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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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* @access private
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* @see html2text()
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*/
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var $_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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* @access public
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* @return void
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*/
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function html2text( $source = '', $from_file = false, $do_links = true, $width = 75 )
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{
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if ( !empty($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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}
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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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* @access public
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* @return void
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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 = $source;
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$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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* @access public
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* @return string
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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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* @access public
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* @return void
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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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* Alias to print_text(), operates identically.
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*
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* @access public
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* @return void
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* @see print_text()
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*/
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function p()
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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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* @access public
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* @return void
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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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* @access public
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* @return void
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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://' . $_SERVER['HTTP_HOST'];
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} else {
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$this->url = '';
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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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}
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* Workhorse function that does actual conversion (calls _converter() method).
|
|
|
*
|
|
|
* @access private
|
|
|
* @return void
|
|
|
*/
|
|
|
function _convert()
|
|
|
{
|
|
|
// Variables used for building the link list
|
|
|
$this->_link_count = 0;
|
|
|
$this->_link_list = '';
|
|
|
|
|
|
$text = trim(stripslashes($this->html));
|
|
|
|
|
|
// Convert HTML to TXT
|
|
|
$this->_converter($text);
|
|
|
|
|
|
// Add link list
|
|
|
if ( !empty($this->_link_list) ) {
|
|
|
$text .= "\n\nLinks:\n------\n" . $this->_link_list;
|
|
|
}
|
|
|
|
|
|
$this->text = $text;
|
|
|
|
|
|
$this->_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
|
|
|
* $width characters.
|
|
|
*
|
|
|
* @param string Reference to HTML content string
|
|
|
*
|
|
|
* @access private
|
|
|
* @return void
|
|
|
*/
|
|
|
function _converter(&$text)
|
|
|
{
|
|
|
// Convert <BLOCKQUOTE> (before PRE!)
|
|
|
$this->_convert_blockquotes($text);
|
|
|
|
|
|
// Convert <PRE>
|
|
|
$this->_convert_pre($text);
|
|
|
|
|
|
// Run our defined search-and-replace
|
|
|
$text = preg_replace($this->search, $this->replace, $text);
|
|
|
|
|
|
// Replace known html entities
|
|
|
$text = html_entity_decode($text, ENT_COMPAT, 'UTF-8');
|
|
|
|
|
|
// Run our defined search-and-replace with callback
|
|
|
$text = preg_replace_callback($this->callback_search, array('html2text', '_preg_callback'), $text);
|
|
|
|
|
|
// Remove unknown/unhandled entities (this cannot be done in search-and-replace block)
|
|
|
$text = preg_replace('/&#?[a-z0-9]{2,7};/i', '', $text);
|
|
|
|
|
|
// Strip any other HTML tags
|
|
|
$text = strip_tags($text, $this->allowed_tags);
|
|
|
|
|
|
// Bring down number of empty lines to 2 max
|
|
|
$text = preg_replace("/\n\s+\n/", "\n\n", $text);
|
|
|
$text = preg_replace("/[\n]{3,}/", "\n\n", $text);
|
|
|
|
|
|
// Wrap the text to a readable format
|
|
|
// for PHP versions >= 4.0.2. Default width is 75
|
|
|
// If width is 0 or less, don't wrap the text.
|
|
|
if ( $this->width > 0 ) {
|
|
|
$text = wordwrap($text, $this->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
|
|
|
* @access private
|
|
|
* @return string
|
|
|
*/
|
|
|
function _build_link_list( $link, $display )
|
|
|
{
|
|
|
if ( !$this->_do_links )
|
|
|
return $display;
|
|
|
|
|
|
if ( substr($link, 0, 7) == 'http://' || substr($link, 0, 8) == 'https://' ||
|
|
|
substr($link, 0, 7) == 'mailto:'
|
|
|
) {
|
|
|
$this->_link_count++;
|
|
|
$this->_link_list .= '[' . $this->_link_count . "] $link\n";
|
|
|
$additional = ' [' . $this->_link_count . ']';
|
|
|
} elseif ( substr($link, 0, 11) == 'javascript:' ) {
|
|
|
// Don't count the link; ignore it
|
|
|
$additional = '';
|
|
|
// what about href="#anchor" ?
|
|
|
} else {
|
|
|
$this->_link_count++;
|
|
|
$this->_link_list .= '[' . $this->_link_count . '] ' . $this->url;
|
|
|
if ( substr($link, 0, 1) != '/' ) {
|
|
|
$this->_link_list .= '/';
|
|
|
}
|
|
|
$this->_link_list .= "$link\n";
|
|
|
$additional = ' [' . $this->_link_count . ']';
|
|
|
}
|
|
|
|
|
|
return $display . $additional;
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* Helper function for PRE body conversion.
|
|
|
*
|
|
|
* @param string HTML content
|
|
|
* @access private
|
|
|
*/
|
|
|
function _convert_pre(&$text)
|
|
|
{
|
|
|
while (preg_match('/<pre[^>]*>(.*)<\/pre>/ismU', $text, $matches)) {
|
|
|
$result = preg_replace($this->pre_search, $this->pre_replace, $matches[1]);
|
|
|
$text = preg_replace('/<pre[^>]*>.*<\/pre>/ismU', '<div><br>' . $result . '<br></div>', $text, 1);
|
|
|
}
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* Helper function for BLOCKQUOTE body conversion.
|
|
|
*
|
|
|
* @param string HTML content
|
|
|
* @access private
|
|
|
*/
|
|
|
function _convert_blockquotes(&$text)
|
|
|
{
|
|
|
if (preg_match_all('/<\/*blockquote[^>]*>/i', $text, $matches, PREG_OFFSET_CAPTURE)) {
|
|
|
$level = 0;
|
|
|
$diff = 0;
|
|
|
foreach ($matches[0] as $m) {
|
|
|
if ($m[0][0] == '<' && $m[0][1] == '/') {
|
|
|
$level--;
|
|
|
if ($level < 0) {
|
|
|
$level = 0; // malformed HTML: go to next blockquote
|
|
|
}
|
|
|
else if ($level > 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 = $this->width;
|
|
|
if ($this->width > 0) $this->width -= 2;
|
|
|
// Convert blockquote content
|
|
|
$body = trim($body);
|
|
|
$this->_converter($body);
|
|
|
// Add citation markers and create PRE block
|
|
|
$body = preg_replace('/((^|\n)>*)/', '\\1> ', trim($body));
|
|
|
$body = '<pre>' . htmlspecialchars($body) . '</pre>';
|
|
|
// Re-set text width
|
|
|
$this->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]);
|
|
|
}
|
|
|
$level ++;
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* Callback function for preg_replace_callback use.
|
|
|
*
|
|
|
* @param array PREG matches
|
|
|
* @return string
|
|
|
* @access private
|
|
|
*/
|
|
|
function _preg_callback($matches)
|
|
|
{
|
|
|
switch($matches[1]) {
|
|
|
case 'b':
|
|
|
case 'strong':
|
|
|
return $this->_strtoupper($matches[2]);
|
|
|
case 'th':
|
|
|
return $this->_strtoupper("\t\t". $matches[2] ."\n");
|
|
|
case 'h':
|
|
|
return $this->_strtoupper("\n\n". $matches[2] ."\n\n");
|
|
|
case 'a':
|
|
|
return $this->_build_link_list($matches[3], $matches[4]);
|
|
|
}
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* Strtoupper multibyte wrapper function
|
|
|
*
|
|
|
* @param string
|
|
|
* @return string
|
|
|
* @access private
|
|
|
*/
|
|
|
function _strtoupper($str)
|
|
|
{
|
|
|
if (function_exists('mb_strtoupper'))
|
|
|
return mb_strtoupper($str);
|
|
|
else
|
|
|
return strtoupper($str);
|
|
|
}
|
|
|
}
|