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<?php
/**
* @package Lib_Compojoom
* @author DanielDimitrov <daniel@compojoom.com>
* @date 30.09.2014
*
* @copyright Copyright (C) 2008 - 2013 compojoom.com . All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE
*/
defined('_JEXEC') or die('Restricted access');
/**
* HTML helper class for rendering manipulated strings.
* Since the truncateComplex is not available on j3.1
* we had to create this class
*
* @package Lib_Compojoom
* @subpackage HTML
* @since 1.6
*/
abstract class CompojoomHtmlString
{
/**
* This method is available first in joomla 3.1
* We have this function here to polyfill for joomla 2.5
*
* Method to extend the truncate method to more complex situations
*
* The goal is to get the proper length plain text string with as much of
* the html intact as possible with all tags properly closed.
*
* @param string $html The content of the introtext to be truncated
* @param integer $maxLength The maximum number of characters to render
* @param boolean $noSplit Don't split a word if that is where the cutoff occurs (default: true).
*
* @return string The truncated string. If the string is truncated an ellipsis
* (...) will be appended.
*
* @note If a maximum length of 3 or less is selected and the text has more than
* that number of characters an ellipsis will be displayed.
* This method will not create valid HTML from malformed HTML.
*
* @since 3.1
*/
public static function truncateComplex($html, $maxLength = 0, $noSplit = true)
{
if (JVERSION > 3.1)
{
return JHtmlString::truncateComplex($html, $maxLength, $noSplit);
}
// Start with some basic rules.
$baseLength = strlen($html);
// If the original HTML string is shorter than the $maxLength do nothing and return that.
if ($baseLength <= $maxLength || $maxLength == 0)
{
return $html;
}
// Take care of short simple cases.
if ($maxLength <= 3 && substr($html, 0, 1) != '<' && strpos(substr($html, 0, $maxLength - 1), '<') === false && $baseLength > $maxLength)
{
return '...';
}
// Deal with maximum length of 1 where the string starts with a tag.
if ($maxLength == 1 && substr($html, 0, 1) == '<')
{
$endTagPos = strlen(strstr($html, '>', true));
$tag = substr($html, 1, $endTagPos);
$l = $endTagPos + 1;
if ($noSplit)
{
return substr($html, 0, $l) . '</' . $tag . '...';
}
// TODO: $character doesn't seem to be used...
$character = substr(strip_tags($html), 0, 1);
return substr($html, 0, $l) . '</' . $tag . '...';
}
// First get the truncated plain text string. This is the rendered text we want to end up with.
$ptString = JHtml::_('string.truncate', $html, $maxLength, $noSplit, $allowHtml = false);
// It's all HTML, just return it.
if (strlen($ptString) == 0)
{
return $html;
}
// If the plain text is shorter than the max length the variable will not end in ...
// In that case we use the whole string.
if (substr($ptString, -3) != '...')
{
return $html;
}
// Regular truncate gives us the ellipsis but we want to go back for text and tags.
if ($ptString == '...')
{
$stripped = substr(strip_tags($html), 0, $maxLength);
$ptString = JHtml::_('string.truncate', $stripped, $maxLength, $noSplit, $allowHtml = false);
}
// We need to trim the ellipsis that truncate adds.
$ptString = rtrim($ptString, '.');
// Now deal with more complex truncation.
while ($maxLength <= $baseLength)
{
// Get the truncated string assuming HTML is allowed.
$htmlString = JHtml::_('string.truncate', $html, $maxLength, $noSplit, $allowHtml = true);
if ($htmlString == '...' && strlen($ptString) + 3 > $maxLength)
{
return $htmlString;
}
$htmlString = rtrim($htmlString, '.');
// Now get the plain text from the HTML string and trim it.
$htmlStringToPtString = JHtml::_('string.truncate', $htmlString, $maxLength, $noSplit, $allowHtml = false);
$htmlStringToPtString = rtrim($htmlStringToPtString, '.');
// If the new plain text string matches the original plain text string we are done.
if ($ptString == $htmlStringToPtString)
{
return $htmlString . '...';
}
// Get the number of HTML tag characters in the first $maxLength characters
$diffLength = strlen($ptString) - strlen($htmlStringToPtString);
if ($diffLength <= 0)
{
return $htmlString . '...';
}
// Set new $maxlength that adjusts for the HTML tags
$maxLength += $diffLength;
}
}
}
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