|
|
<?php
|
|
|
|
|
|
/*************************************************************************
|
|
|
* *
|
|
|
* class.html2text.inc *
|
|
|
* *
|
|
|
*************************************************************************
|
|
|
* *
|
|
|
* Converts HTML to formatted plain text *
|
|
|
* *
|
|
|
* Copyright (c) 2005-2007 Jon Abernathy <jon@chuggnutt.com> *
|
|
|
* All rights reserved. *
|
|
|
* *
|
|
|
* This script is free software; you can redistribute it and/or modify *
|
|
|
* it under the terms of the GNU General Public License as published by *
|
|
|
* the Free Software Foundation; either version 2 of the License, or *
|
|
|
* (at your option) any later version. *
|
|
|
* *
|
|
|
* The GNU General Public License can be found at *
|
|
|
* http://www.gnu.org/copyleft/gpl.html. *
|
|
|
* *
|
|
|
* This script is distributed in the hope that it will be useful, *
|
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
|
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
|
|
|
* GNU General Public License for more details. *
|
|
|
* *
|
|
|
* Author(s): Jon Abernathy <jon@chuggnutt.com> *
|
|
|
* *
|
|
|
* Last modified: 08/08/07 *
|
|
|
* *
|
|
|
*************************************************************************/
|
|
|
|
|
|
|
|
|
/**
|
|
|
* Takes HTML and converts it to formatted, plain text.
|
|
|
*
|
|
|
* Thanks to Alexander Krug (http://www.krugar.de/) to pointing out and
|
|
|
* correcting an error in the regexp search array. Fixed 7/30/03.
|
|
|
*
|
|
|
* Updated set_html() function's file reading mechanism, 9/25/03.
|
|
|
*
|
|
|
* Thanks to Joss Sanglier (http://www.dancingbear.co.uk/) for adding
|
|
|
* several more HTML entity codes to the $search and $replace arrays.
|
|
|
* Updated 11/7/03.
|
|
|
*
|
|
|
* Thanks to Darius Kasperavicius (http://www.dar.dar.lt/) for
|
|
|
* suggesting the addition of $allowed_tags and its supporting function
|
|
|
* (which I slightly modified). Updated 3/12/04.
|
|
|
*
|
|
|
* Thanks to Justin Dearing for pointing out that a replacement for the
|
|
|
* <TH> tag was missing, and suggesting an appropriate fix.
|
|
|
* Updated 8/25/04.
|
|
|
*
|
|
|
* Thanks to Mathieu Collas (http://www.myefarm.com/) for finding a
|
|
|
* display/formatting bug in the _build_link_list() function: email
|
|
|
* readers would show the left bracket and number ("[1") as part of the
|
|
|
* rendered email address.
|
|
|
* Updated 12/16/04.
|
|
|
*
|
|
|
* Thanks to Wojciech Bajon (http://histeria.pl/) for submitting code
|
|
|
* to handle relative links, which I hadn't considered. I modified his
|
|
|
* code a bit to handle normal HTTP links and MAILTO links. Also for
|
|
|
* suggesting three additional HTML entity codes to search for.
|
|
|
* Updated 03/02/05.
|
|
|
*
|
|
|
* Thanks to Jacob Chandler for pointing out another link condition
|
|
|
* for the _build_link_list() function: "https".
|
|
|
* Updated 04/06/05.
|
|
|
*
|
|
|
* Thanks to Marc Bertrand (http://www.dresdensky.com/) for
|
|
|
* suggesting a revision to the word wrapping functionality; if you
|
|
|
* specify a $width of 0 or less, word wrapping will be ignored.
|
|
|
* Updated 11/02/06.
|
|
|
*
|
|
|
* *** Big housecleaning updates below:
|
|
|
*
|
|
|
* Thanks to Colin Brown (http://www.sparkdriver.co.uk/) for
|
|
|
* suggesting the fix to handle </li> and blank lines (whitespace).
|
|
|
* Christian Basedau (http://www.movetheweb.de/) also suggested the
|
|
|
* blank lines fix.
|
|
|
*
|
|
|
* Special thanks to Marcus Bointon (http://www.synchromedia.co.uk/),
|
|
|
* Christian Basedau, Norbert Laposa (http://ln5.co.uk/),
|
|
|
* Bas van de Weijer, and Marijn van Butselaar
|
|
|
* for pointing out my glaring error in the <th> handling. Marcus also
|
|
|
* supplied a host of fixes.
|
|
|
*
|
|
|
* Thanks to Jeffrey Silverman (http://www.newtnotes.com/) for pointing
|
|
|
* out that extra spaces should be compressed--a problem addressed with
|
|
|
* Marcus Bointon's fixes but that I had not yet incorporated.
|
|
|
*
|
|
|
* Thanks to Daniel Schledermann (http://www.typoconsult.dk/) for
|
|
|
* suggesting a valuable fix with <a> tag handling.
|
|
|
*
|
|
|
* Thanks to Wojciech Bajon (again!) for suggesting fixes and additions,
|
|
|
* including the <a> tag handling that Daniel Schledermann pointed
|
|
|
* out but that I had not yet incorporated. I haven't (yet)
|
|
|
* incorporated all of Wojciech's changes, though I may at some
|
|
|
* future time.
|
|
|
*
|
|
|
* *** End of the housecleaning updates. Updated 08/08/07.
|
|
|
*
|
|
|
* @author Jon Abernathy <jon@chuggnutt.com>
|
|
|
* @version 1.0.0
|
|
|
* @since PHP 4.0.2
|
|
|
*/
|
|
|
class html2text
|
|
|
{
|
|
|
|
|
|
/**
|
|
|
* Contains the HTML content to convert.
|
|
|
*
|
|
|
* @var string $html
|
|
|
* @access public
|
|
|
*/
|
|
|
var $html;
|
|
|
|
|
|
/**
|
|
|
* Contains the converted, formatted text.
|
|
|
*
|
|
|
* @var string $text
|
|
|
* @access public
|
|
|
*/
|
|
|
var $text;
|
|
|
|
|
|
/**
|
|
|
* Maximum width of the formatted text, in columns.
|
|
|
*
|
|
|
* Set this value to 0 (or less) to ignore word wrapping
|
|
|
* and not constrain text to a fixed-width column.
|
|
|
*
|
|
|
* @var integer $width
|
|
|
* @access public
|
|
|
*/
|
|
|
var $width = 70;
|
|
|
|
|
|
/**
|
|
|
* List of preg* regular expression patterns to search for,
|
|
|
* used in conjunction with $replace.
|
|
|
*
|
|
|
* @var array $search
|
|
|
* @access public
|
|
|
* @see $replace
|
|
|
*/
|
|
|
var $search = array(
|
|
|
"/\r/", // Non-legal carriage return
|
|
|
"/[\n\t]+/", // Newlines and tabs
|
|
|
'/[ ]{2,}/', // Runs of spaces, pre-handling
|
|
|
'/<script[^>]*>.*?<\/script>/i', // <script>s -- which strip_tags supposedly has problems with
|
|
|
'/<style[^>]*>.*?<\/style>/i', // <style>s -- which strip_tags supposedly has problems with
|
|
|
//'/<!-- .* -->/', // Comments -- which strip_tags might have problem a with
|
|
|
'/<h[123][^>]*>(.*?)<\/h[123]>/ie', // H1 - H3
|
|
|
'/<h[456][^>]*>(.*?)<\/h[456]>/ie', // H4 - H6
|
|
|
'/<p[^>]*>/i', // <P>
|
|
|
'/<br[^>]*>/i', // <br>
|
|
|
'/<b[^>]*>(.*?)<\/b>/ie', // <b>
|
|
|
'/<strong[^>]*>(.*?)<\/strong>/ie', // <strong>
|
|
|
'/<i[^>]*>(.*?)<\/i>/i', // <i>
|
|
|
'/<em[^>]*>(.*?)<\/em>/i', // <em>
|
|
|
'/(<ul[^>]*>|<\/ul>)/i', // <ul> and </ul>
|
|
|
'/(<ol[^>]*>|<\/ol>)/i', // <ol> and </ol>
|
|
|
'/<li[^>]*>(.*?)<\/li>/i', // <li> and </li>
|
|
|
'/<li[^>]*>/i', // <li>
|
|
|
'/<a [^>]*href=("|\')([^"\']+)\1[^>]*>(.*?)<\/a>/ie',
|
|
|
// <a href="">
|
|
|
'/<hr[^>]*>/i', // <hr>
|
|
|
'/(<table[^>]*>|<\/table>)/i', // <table> and </table>
|
|
|
'/(<tr[^>]*>|<\/tr>)/i', // <tr> and </tr>
|
|
|
'/<td[^>]*>(.*?)<\/td>/i', // <td> and </td>
|
|
|
'/<th[^>]*>(.*?)<\/th>/ie', // <th> and </th>
|
|
|
'/&(nbsp|#160);/i', // Non-breaking space
|
|
|
'/&(quot|rdquo|ldquo|#8220|#8221|#147|#148);/i',
|
|
|
// Double quotes
|
|
|
'/&(apos|rsquo|lsquo|#8216|#8217);/i', // Single quotes
|
|
|
'/>/i', // Greater-than
|
|
|
'/</i', // Less-than
|
|
|
'/&(amp|#38);/i', // Ampersand
|
|
|
'/&(copy|#169);/i', // Copyright
|
|
|
'/&(trade|#8482|#153);/i', // Trademark
|
|
|
'/&(reg|#174);/i', // Registered
|
|
|
'/&(mdash|#151|#8212);/i', // mdash
|
|
|
'/&(ndash|minus|#8211|#8722);/i', // ndash
|
|
|
'/&(bull|#149|#8226);/i', // Bullet
|
|
|
'/&(pound|#163);/i', // Pound sign
|
|
|
'/&(euro|#8364);/i', // Euro sign
|
|
|
'/&[^&;]+;/i', // Unknown/unhandled entities
|
|
|
'/[ ]{2,}/' // Runs of spaces, post-handling
|
|
|
);
|
|
|
|
|
|
/**
|
|
|
* List of pattern replacements corresponding to patterns searched.
|
|
|
*
|
|
|
* @var array $replace
|
|
|
* @access public
|
|
|
* @see $search
|
|
|
*/
|
|
|
var $replace = array(
|
|
|
'', // Non-legal carriage return
|
|
|
' ', // Newlines and tabs
|
|
|
' ', // Runs of spaces, pre-handling
|
|
|
'', // <script>s -- which strip_tags supposedly has problems with
|
|
|
'', // <style>s -- which strip_tags supposedly has problems with
|
|
|
//'', // Comments -- which strip_tags might have problem a with
|
|
|
"strtoupper(\"\n\n\\1\n\n\")", // H1 - H3
|
|
|
"ucwords(\"\n\n\\1\n\")", // H4 - H6
|
|
|
"\n\n", // <P>
|
|
|
"\n", // <br>
|
|
|
'strtoupper("\\1")', // <b>
|
|
|
'strtoupper("\\1")', // <strong>
|
|
|
'_\\1_', // <i>
|
|
|
'_\\1_', // <em>
|
|
|
"\n\n", // <ul> and </ul>
|
|
|
"\n\n", // <ol> and </ol>
|
|
|
"\t* \\1\n", // <li> and </li>
|
|
|
"\n\t* ", // <li>
|
|
|
'$this->_build_link_list("\\2", "\\3")',
|
|
|
// <a href="">
|
|
|
"\n-------------------------\n", // <hr>
|
|
|
"\n\n", // <table> and </table>
|
|
|
"\n", // <tr> and </tr>
|
|
|
"\t\t\\1\n", // <td> and </td>
|
|
|
"strtoupper(\"\t\t\\1\n\")", // <th> and </th>
|
|
|
' ', // Non-breaking space
|
|
|
'"', // Double quotes
|
|
|
"'", // Single quotes
|
|
|
'>',
|
|
|
'<',
|
|
|
'&',
|
|
|
'(c)',
|
|
|
'(tm)',
|
|
|
'(R)',
|
|
|
'--',
|
|
|
'-',
|
|
|
'*',
|
|
|
'<27>',
|
|
|
'EUR', // Euro sign. <20> ?
|
|
|
'', // Unknown/unhandled entities
|
|
|
' ' // Runs of spaces, post-handling
|
|
|
);
|
|
|
|
|
|
/**
|
|
|
* List of preg* regular expression patterns to search for in PRE body,
|
|
|
* used in conjunction with $pre_replace.
|
|
|
*
|
|
|
* @var array $pre_search
|
|
|
* @access public
|
|
|
* @see $pre_replace
|
|
|
*/
|
|
|
var $pre_search = array(
|
|
|
"/\n/",
|
|
|
"/\t/",
|
|
|
'/ /',
|
|
|
'/<pre[^>]*>/',
|
|
|
'/<\/pre>/'
|
|
|
);
|
|
|
|
|
|
/**
|
|
|
* List of pattern replacements corresponding to patterns searched for PRE body.
|
|
|
*
|
|
|
* @var array $pre_replace
|
|
|
* @access public
|
|
|
* @see $pre_search
|
|
|
*/
|
|
|
var $pre_replace = array(
|
|
|
'<br>',
|
|
|
' ',
|
|
|
' ',
|
|
|
'',
|
|
|
''
|
|
|
);
|
|
|
|
|
|
/**
|
|
|
* Contains a list of HTML tags to allow in the resulting text.
|
|
|
*
|
|
|
* @var string $allowed_tags
|
|
|
* @access public
|
|
|
* @see set_allowed_tags()
|
|
|
*/
|
|
|
var $allowed_tags = '';
|
|
|
|
|
|
/**
|
|
|
* Contains the base URL that relative links should resolve to.
|
|
|
*
|
|
|
* @var string $url
|
|
|
* @access public
|
|
|
*/
|
|
|
var $url;
|
|
|
|
|
|
/**
|
|
|
* Indicates whether content in the $html variable has been converted yet.
|
|
|
*
|
|
|
* @var boolean $_converted
|
|
|
* @access private
|
|
|
* @see $html, $text
|
|
|
*/
|
|
|
var $_converted = false;
|
|
|
|
|
|
/**
|
|
|
* Contains URL addresses from links to be rendered in plain text.
|
|
|
*
|
|
|
* @var string $_link_list
|
|
|
* @access private
|
|
|
* @see _build_link_list()
|
|
|
*/
|
|
|
var $_link_list = '';
|
|
|
|
|
|
/**
|
|
|
* Number of valid links detected in the text, used for plain text
|
|
|
* display (rendered similar to footnotes).
|
|
|
*
|
|
|
* @var integer $_link_count
|
|
|
* @access private
|
|
|
* @see _build_link_list()
|
|
|
*/
|
|
|
var $_link_count = 0;
|
|
|
|
|
|
/**
|
|
|
* Boolean flag, true if a table of link URLs should be listed after the text.
|
|
|
*
|
|
|
* @var boolean $_do_links
|
|
|
* @access private
|
|
|
* @see html2text()
|
|
|
*/
|
|
|
var $_do_links = true;
|
|
|
|
|
|
/**
|
|
|
* Constructor.
|
|
|
*
|
|
|
* If the HTML source string (or file) is supplied, the class
|
|
|
* will instantiate with that source propagated, all that has
|
|
|
* to be done it to call get_text().
|
|
|
*
|
|
|
* @param string $source HTML content
|
|
|
* @param boolean $from_file Indicates $source is a file to pull content from
|
|
|
* @param boolean $do_links Indicate whether a table of link URLs is desired
|
|
|
* @param integer $width Maximum width of the formatted text, 0 for no limit
|
|
|
* @access public
|
|
|
* @return void
|
|
|
*/
|
|
|
function html2text( $source = '', $from_file = false, $do_links = true, $width = 75 )
|
|
|
{
|
|
|
if ( !empty($source) ) {
|
|
|
$this->set_html($source, $from_file);
|
|
|
}
|
|
|
|
|
|
$this->set_base_url();
|
|
|
$this->_do_links = $do_links;
|
|
|
$this->width = $width;
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* Loads source HTML into memory, either from $source string or a file.
|
|
|
*
|
|
|
* @param string $source HTML content
|
|
|
* @param boolean $from_file Indicates $source is a file to pull content from
|
|
|
* @access public
|
|
|
* @return void
|
|
|
*/
|
|
|
function set_html( $source, $from_file = false )
|
|
|
{
|
|
|
if ( $from_file && file_exists($source) ) {
|
|
|
$this->html = file_get_contents($source);
|
|
|
}
|
|
|
else
|
|
|
$this->html = $source;
|
|
|
|
|
|
$this->_converted = false;
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* Returns the text, converted from HTML.
|
|
|
*
|
|
|
* @access public
|
|
|
* @return string
|
|
|
*/
|
|
|
function get_text()
|
|
|
{
|
|
|
if ( !$this->_converted ) {
|
|
|
$this->_convert();
|
|
|
}
|
|
|
|
|
|
return $this->text;
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* Prints the text, converted from HTML.
|
|
|
*
|
|
|
* @access public
|
|
|
* @return void
|
|
|
*/
|
|
|
function print_text()
|
|
|
{
|
|
|
print $this->get_text();
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* Alias to print_text(), operates identically.
|
|
|
*
|
|
|
* @access public
|
|
|
* @return void
|
|
|
* @see print_text()
|
|
|
*/
|
|
|
function p()
|
|
|
{
|
|
|
print $this->get_text();
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* Sets the allowed HTML tags to pass through to the resulting text.
|
|
|
*
|
|
|
* Tags should be in the form "<p>", with no corresponding closing tag.
|
|
|
*
|
|
|
* @access public
|
|
|
* @return void
|
|
|
*/
|
|
|
function set_allowed_tags( $allowed_tags = '' )
|
|
|
{
|
|
|
if ( !empty($allowed_tags) ) {
|
|
|
$this->allowed_tags = $allowed_tags;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* Sets a base URL to handle relative links.
|
|
|
*
|
|
|
* @access public
|
|
|
* @return void
|
|
|
*/
|
|
|
function set_base_url( $url = '' )
|
|
|
{
|
|
|
if ( empty($url) ) {
|
|
|
if ( !empty($_SERVER['HTTP_HOST']) ) {
|
|
|
$this->url = 'http://' . $_SERVER['HTTP_HOST'];
|
|
|
} else {
|
|
|
$this->url = '';
|
|
|
}
|
|
|
} else {
|
|
|
// Strip any trailing slashes for consistency (relative
|
|
|
// URLs may already start with a slash like "/file.html")
|
|
|
if ( substr($url, -1) == '/' ) {
|
|
|
$url = substr($url, 0, -1);
|
|
|
}
|
|
|
$this->url = $url;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* 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.
|
|
|
*
|
|
|
* @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 <PRE>
|
|
|
$this->_convert_pre($text);
|
|
|
|
|
|
// Run our defined search-and-replace
|
|
|
$text = preg_replace($this->search, $this->replace, $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", $text);
|
|
|
|
|
|
// Add link list
|
|
|
if ( !empty($this->_link_list) ) {
|
|
|
$text .= "\n\nLinks:\n------\n" . $this->_link_list;
|
|
|
}
|
|
|
|
|
|
// 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);
|
|
|
}
|
|
|
|
|
|
$this->text = $text;
|
|
|
|
|
|
$this->_converted = true;
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* 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);
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
?>
|