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<?php
/**
* The MIME_Viewer_richtext class renders out HTML text from text/richtext
* content tags, (RFC 1896 [7.1.3]).
*
* A minimal richtext implementation is one that simply converts "<lt>" to
* "<", converts CRLFs to SPACE, converts <nl> to a newline according to
* local newline convention, removes everything between a <comment> command
* and the next balancing </comment> command, and removes all other
* other formatting commands (all text enclosed in angle brackets).
*
* We implement the following tags:
* <bold>, <italic>, <fixed>, <smaller>, <bigger>, <underline>, <center>,
* <flushleft>, <flushright>, <indent>, <subscript>, <excerpt>, <paragraph>,
* <signature>, <comment>, <no-op>, <lt>, <nl>
*
* The following tags are implemented differently than described in the RFC
* (due to limitations in HTML output):
* <heading> - Output as centered, bold text.
* <footing> - Output as centered, bold text.
* <np> - Output as paragraph break.
*
* The following tags are NOT implemented:
* <indentright>, <outdent>, <outdentright>, <samepage>, <iso-8859-X>,
* <us-ascii>,
*
* $Horde: framework/MIME/MIME/Viewer/richtext.php,v 1.4.10.7 2006/01/01 21:28:25 jan Exp $
*
* Copyright 2004-2006 Michael Slusarz <slusarz@bigworm.colorado.edu>
*
* See the enclosed file COPYING for license information (LGPL). If you
* did not receive this file, see http://www.fsf.org/copyleft/lgpl.html.
*
* @author Michael Slusarz <slusarz@bigworm.colorado.edu>
* @since Horde 3.0
* @package Horde_MIME_Viewer
*/
class MIME_Viewer_richtext extends MIME_Viewer {
/**
* Render out the currently set contents in HTML format.
*
* @param array $params Any parameters the Viewer may need.
*
* @return string The rendered contents.
*/
function render($params = array())
{
if (($text = $this->mime_part->getContents()) === false) {
return false;
}
if (trim($text) == '') {
return $text;
}
/* Use str_ireplace() if using PHP 5.0+. */
$has_str_ireplace = function_exists('str_ireplace');
/* We add space at the beginning and end of the string as it will
* make some regular expression checks later much easier (so we
* don't have to worry about start/end of line characters). */
$text = ' ' . $text . ' ';
/* Remove everything between <comment> tags. */
$text = preg_replace('/<comment.*>.*<\/comment>/Uis', '', $text);
/* Remove any unrecognized tags in the text. We don't need <no-op>
* in $tags since it doesn't do anything anyway. All <comment> tags
* have already been removed. */
$tags = '<bold><italic><fixed><smaller><bigger><underline><center><flushleft><flushright><indent><subscript><excerpt><paragraph><signature><lt><nl>';
$text = strip_tags($text, $tags);
/* <lt> becomes a '<'. CRLF becomes a SPACE. */
if ($has_str_ireplace) {
$text = str_ireplace(array('<lt>', "\r\n"), array('<', ' '), $text);
} else {
$text = preg_replace(array('/<lt>/i', "/\r\n/"), array('<', ' '), $text);
}
/* We try to protect against bad stuff here. */
$text = @htmlspecialchars($text, ENT_QUOTES, $this->mime_part->getCharset());
/* <nl> becomes a newline (<br />);
* <np> becomes a paragraph break (<p />). */
if ($has_str_ireplace) {
$text = str_ireplace(array('<nl>', '<np>'), array('<br />', '<p />'), $text);
} else {
$text = preg_replace(array('/(?<!<)<nl.*>/Uis', '/(?<!<)<np.*>/Uis'), array('<br />', '<p />'), $text);
}
/* Now convert the known tags to html. Try to remove any tag
* parameters to stop people from trying to pull a fast one. */
$text = preg_replace('/(?<!<)<bold.*>(.*)<\/bold>/Uis', '<span style="font-weight: bold">\1</span>', $text);
$text = preg_replace('/(?<!<)<italic.*>(.*)<\/italic>/Uis', '<span style="font-style: italic">\1</span>', $text);
$text = preg_replace('/(?<!<)<fixed.*>(.*)<\/fixed>/Uis', '<font face="fixed">\1</font>', $text);
$text = preg_replace('/(?<!<)<smaller.*>/Uis', '<span style="font-size: smaller">', $text);
$text = preg_replace('/(?<!<)<\/smaller>/Uis', '</span>', $text);
$text = preg_replace('/(?<!<)<bigger.*>/Uis', '<span style="font-size: larger">', $text);
$text = preg_replace('/(?<!<)<\/bigger>/Uis', '</span>', $text);
$text = preg_replace('/(?<!<)<underline.*>(.*)<\/underline>/Uis', '<span style="text-decoration: underline">\1</span>', $text);
$text = preg_replace('/(?<!<)<center.*>(.*)<\/center>/Uis', '<div align="center">\1</div>', $text);
$text = preg_replace('/(?<!<)<flushleft.*>(.*)<\/flushleft>/Uis', '<div align="left">\1</div>', $text);
$text = preg_replace('/(?<!<)<flushright.*>(.*)<\/flushright>/Uis', '<div align="right">\1</div>', $text);
$text = preg_replace('/(?<!<)<indent.*>(.*)<\/indent>/Uis', '<blockquote>\1</blockquote>', $text);
$text = preg_replace('/(?<!<)<excerpt.*>(.*)<\/excerpt>/Uis', '<cite>\1</cite>', $text);
$text = preg_replace('/(?<!<)<subscript.*>(.*)<\/subscript>/Uis', '<sub>\1</sub>', $text);
$text = preg_replace('/(?<!<)<superscript.*>(.*)<\/superscript>/Uis', '<sup>\1</sup>', $text);
$text = preg_replace('/(?<!<)<heading.*>(.*)<\/heading>/Uis', '<br /><div align="center" style="font-weight: bold">\1</div><br />', $text);
$text = preg_replace('/(?<!<)<footing.*>(.*)<\/footing>/Uis', '<br /><div align="center" style="font-weight: bold">\1</div><br />', $text);
$text = preg_replace('/(?<!<)<paragraph.*>(.*)<\/paragraph>/Uis', '<p>\1</p>', $text);
$text = preg_replace('/(?<!<)<signature.*>(.*)<\/signature>/Uis', '<address>\1</address>', $text);
/* Now we remove the leading/trailing space we added at the start. */
$text = substr($text, 1, -1);
/* Wordwrap. */
$text = str_replace("\t", ' ', $text);
$text = str_replace(' ', ' ', $text);
$text = str_replace("\n ", "\n ", $text);
if ($text[0] == ' ') {
$text = ' ' . substr($text, 1);
}
$text = nl2br($text);
$text = '<p class="fixed">' . $text . '</p>';
return $text;
}
/**
* Return the MIME content type of the rendered content.
*
* @return string The content type of the output.
*/
function getType()
{
return 'text/html; charset=' . NLS::getCharset();
}
}
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