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451 lines
14 KiB
PHP
451 lines
14 KiB
PHP
<?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 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: 04/06/05 *
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* Modified: 2004/05/19 (tbr) *
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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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* @author Jon Abernathy <jon@chuggnutt.com>
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* @version 0.6.1
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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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* @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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'/<script[^>]*>.*?<\/script>/i', // <script>s -- which strip_tags supposedly has problems with
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//'/<!-- .* -->/', // Comments -- which strip_tags might have problem a with
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'/<a [^>]*href=("|\')([^"\']+)\1[^>]*>(.+?)<\/a>/ie', // <a href="">
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'/<h[123][^>]*>(.+?)<\/h[123]>/ie', // H1 - H3
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'/<h[456][^>]*>(.+?)<\/h[456]>/ie', // H4 - H6
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'/<p[^>]*>/i', // <P>
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'/<br[^>]*>/i', // <br>
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'/<b[^>]*>(.+?)<\/b>/ie', // <b>
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'/<i[^>]*>(.+?)<\/i>/i', // <i>
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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[^>]*>/i', // <li>
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'/<hr[^>]*>/i', // <hr>
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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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'/<th[^>]*>(.+?)<\/th>/ie', // <th> and </th>
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'/ /i',
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'/"/i',
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'/>/i',
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'/</i',
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'/&(amp|#38);/i',
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'/©/i',
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'/™/i',
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'/“/',
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'/”/',
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'/–/',
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'/&#(8217|39);/',
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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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'/®/i',
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'/•/i',
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'/&[&;]+;/i'
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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 $replace = array(
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'', // Non-legal carriage return
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' ', // Newlines and tabs
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'', // <script>s -- which strip_tags supposedly has problems with
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//'', // Comments -- which strip_tags might have problem a with
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'$this->_build_link_list("\\2", "\\3")', // <a href="">
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"strtoupper(\"\n\n\\1\n\n\")", // H1 - H3
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"ucwords(\"\n\n\\1\n\")", // H4 - H6
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"\n\n", // <P>
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"\n", // <br>
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'strtoupper("\\1")', // <b>
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'_\\1_', // <i>
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"\n\n", // <ul> and </ul>
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"\n\n", // <ol> and </ol>
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"\t*", // <li>
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"\n-------------------------\n", // <hr>
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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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"strtoupper(\"\t\t\\1\n\")", // <th> and </th>
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' ',
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'"',
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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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'"',
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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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'--',
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'"',
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'"',
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'*',
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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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* 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 = 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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* @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_link_table indicate whether a table of link URLs is desired
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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, $produce_link_table = true )
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{
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if ( !empty($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 = $produce_link_table;
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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, $from_file = false )
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{
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$this->html = $source;
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if ( $from_file && file_exists($source) ) {
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$fp = fopen($source, 'r');
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$this->html = fread($fp, filesize($source));
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fclose($fp);
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}
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$this->_converted = false;
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}
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/**
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* Returns the text, converted from HTML.
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*
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* @access public
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* @return string
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*/
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function get_text()
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{
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if ( !$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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$this->url = 'http://' . $_SERVER['HTTP_HOST'];
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} else {
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// Strip any trailing slashes for consistency (relative
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// URLs may already start with a slash like "/file.html")
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if ( substr($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.
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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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* $width characters.
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*
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* @access private
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* @return void
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*/
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function _convert()
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{
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// Variables used for building the link list
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//$link_count = 1;
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//$this->_link_list = '';
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$text = trim(stripslashes($this->html));
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// Run our defined search-and-replace
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$text = preg_replace($this->search, $this->replace, $text);
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// Strip any other HTML tags
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$text = strip_tags($text, $this->allowed_tags);
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// Bring down number of empty lines to 2 max
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$text = preg_replace("/\n\s+\n/", "\n", $text);
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$text = preg_replace("/[\n]{3,}/", "\n\n", $text);
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// Add link list
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if ( sizeof($this->_link_list) ) {
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$text .= "\n\nLinks:\n------\n";
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foreach ($this->_link_list as $id => $link) {
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$text .= '[' . ($id+1) . '] ' . $link . "\n";
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}
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}
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// Wrap the text to a readable format
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// for PHP versions >= 4.0.2. Default width is 75
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$text = wordwrap($text, $this->width);
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$this->text = $text;
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$this->_converted = true;
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}
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/**
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* 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 integer $link_count Counter tracking current link number
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* @param string $link URL of the link
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* @param string $display Part of the text to associate number with
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* @access private
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* @return string
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*/
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function _build_link_list($link, $display)
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{
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if (! $this->_do_links) return $display;
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$link_lc = strtolower($link);
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if (substr($link_lc, 0, 7) == 'http://' || substr($link_lc, 0, 8) == 'https://' || substr($link_lc, 0, 7) == 'mailto:')
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{
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$url = $link;
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}
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else
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{
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$url = $this->url;
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if ($link{0} != '/') {
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$url .= '/';
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}
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$url .= $link;
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}
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$index = array_search($url, $this->_link_list);
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if ($index===FALSE)
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{
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$index = sizeof($this->_link_list);
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$this->_link_list[$index] = $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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?>
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