cakephp2-php8/libs/helpers/text.php

<?php
/* SVN FILE: $Id$ */

/**
 * Text Helper
 * 
 * Text manipulations: Highlight, excerpt, truncate, strip of links, convert email addresses to mailto: links...
 *
 * PHP versions 4 and 5
 *
 * CakePHP :  Rapid Development Framework <http://www.cakephp.org/>
 * Copyright (c) 2005, CakePHP Authors/Developers
 *
 * Author(s): Michal Tatarynowicz aka Pies <tatarynowicz@gmail.com>
 *            Larry E. Masters aka PhpNut <nut@phpnut.com>
 *            Kamil Dzielinski aka Brego <brego.dk@gmail.com>
 *
 *  Licensed under The MIT License
 *  Redistributions of files must retain the above copyright notice.
 *
 * @filesource 
 * @author       CakePHP Authors/Developers
 * @author       Christian Gillen aka kodos <christian@crew.lu>
 * @copyright    Copyright (c) 2005, CakePHP Authors/Developers
 * @link         https://trac.cakephp.org/wiki/Authors Authors/Developers
 * @package      cake
 * @subpackage   cake.libs.helpers
 * @since        CakePHP v 0.9.2
 * @version      $Revision$
 * @modifiedby   $LastChangedBy$
 * @lastmodified $Date$
 * @license      http://www.opensource.org/licenses/mit-license.php The MIT License
 */

/**
 * Enter description here...
 */
uses('flay', 'helpers/html');

/**
 * Text helper library.
 * 
 * Text manipulations: Highlight, excerpt, truncate, strip of links, convert email addresses to mailto: links...
 *
 * @package    cake
 * @subpackage cake.libs.helpers
 * @since      CakePHP v 0.9.2
 *
 */
class TextHelper extends Helper
{
    /**
     * Highlights a given phrase in a text.
     *
     * @param string $text Text to search the phrase in
     * @param string $phrase The phrase that will be searched
     * @param string $highlighter The piece of html with that the phrase will be highlighted
     * @return string The highlighted text
     */
    function highlight($text, $phrase, $highlighter = '<span class="highlight">\1</span>')
    {
        if (empty($phrase)) return $text;
        if (is_array($phrase))
        {
            $replace = array();
            $with = array();
            foreach ($phrase as $key => $value)
            {
                if (empty($key))
                {
                    $key = $value;
                    $value = $highlighter;
                }
                $replace[] = '|(' . $key . ')|';
                $with[] = empty($value) ? $highlighter : $value;
            }
            return preg_replace($replace, $with, $text);
        }
        else
        {
            return preg_replace("|({$phrase})|i", $highlighter, $text);
        }
    }

    /**
     * Strips given text of all links (<a href=....)
     *
     * @param string $text Text 
     * @return string The text without links
     */
    function stripLinks($text)
    {
        return preg_replace('|<a.*>(.*)<\/a>|im', '\1', $text);
    }

    /**
     * Adds links (<a href=....) to a given text.
     *
     * @param string $text Text 
     * @param array $htmlOptions Array of HTML options.
     * @return string The text with links
     */
    function autoLinkUrls($text, $htmlOptions = array())
    {
        $options = 'array(';
        foreach ($htmlOptions as $option => $value)
        {
            $options .= "'$option' => '$value', ";
        }
        $options .= ')';

        $text = preg_replace_callback(
        '#((?:http|https|ftp|nntp)://[^ ]+)#',
        create_function(
        '$matches',
        '$Html = new HtmlHelper(); return $Html->linkOut($matches[0], $matches[0],' . $options . ');'
        ),
        $text
        );
        return preg_replace_callback(
        '#(?<!http://|https://|ftp://|nntp://)(www\.[^\n\%\ ]+[^\n\%\,\.\ ])#',
        create_function(
        '$matches',
        '$Html = new HtmlHelper(); return $Html->linkOut($matches[0], "http://" . $matches[0],' . $options . ');'
        ),
        $text
        );
    }

    /**
     * Adds email links (<a href="mailto:....) to a given text.
     *
     * @param string $text Text 
     * @param array $htmlOptions Array of HTML options.
     * @return string The text with links
     */
    function autoLinkEmails($text, $htmlOptions = array())
    {
        $options = 'array(';
        foreach ($htmlOptions as $option => $value)
        {
            $options .= "'$option' => '$value', ";
        }
        $options .= ')';

        return preg_replace_callback(
        '#([_A-Za-z0-9+-+]+(?:\.[_A-Za-z0-9+-]+)*@[A-Za-z0-9-]+(?:\.[A-Za-z0-9-]+)*)#',
        create_function(
        '$matches',
        '$Html = new HtmlHelper(); return $Html->linkEmail($matches[0], $matches[0],' . $options . ');'
        ),
        $text
        );
    }

    /**
     * Convert all links and email adresses to HTML links.
     *
     * @param string $text Text 
     * @param array $htmlOptions Array of HTML options.
     * @return string The text with links
     */
    function autoLink($text, $htmlOptions = array())
    {
        return $this->autoLinkEmails($this->autoLinkUrls($text, $htmlOptions), $htmlOptions);
    }

    /**
     * Truncates text.
     * 
     * Cuts a string to the length of $length and replaces the last characters
     * with the ending if the text is longer than length.
     *
     * @param string  $text   String to truncate.
     * @param integer $length Length of returned string, including ellipsis.
     * @param string  $ending Ending to be appended to the trimmed string.
     * @return string Trimmed string.
     */
    function truncate($text, $length, $ending='...')
    {
        if (strlen($text) <= $length)
        return $text;
        else
        return substr($text, 0, $length - strlen($ending)) . $ending;
    }
    
    
    /**
     * Alias for truncate().
     *
     * @see TextHelper::truncate()
     */
    function trim()
    {
        $args = func_get_args();
        return call_user_func_array(array(&$this, "truncate"), $args);
    }

    /**
     * Extracts an excerpt from the text surrounding the phrase with a number of characters on each side determined by radius.
     *
     * @param string $text String to search the phrase in
     * @param string $phrase Phrase that will be searched for
     * @param integer $radius The amount of characters that will be returned on each side of the founded phrase
     * @param string $ending Ending that will be appended
     * @return string Enter description here...
     */
    function excerpt($text, $phrase, $radius = 100, $ending = "...")
    {
        if (empty($text) or empty($phrase)) return $this->truncate($text, $radius * 2, $ending);
        if ($radius < strlen($phrase)) $radius = strlen($phrase);

        $pos = strpos($text, $phrase);
        $startPos = $pos <= $radius ? 0 : $pos - $radius;
        $endPos = $pos + strlen($phrase) + $radius >= strlen($text) ? strlen($text) : $pos + strlen($phrase) + $radius;

        $excerpt = substr($text, $startPos, $endPos - $startPos);

        if ($startPos != 0) $excerpt = substr_replace($excerpt, $ending, 0, strlen($phrase));
        if ($endPos != strlen($text)) $excerpt = substr_replace($excerpt, $ending, -strlen($phrase));

        return $excerpt;
    }

    /**
     * Text-to-html parser, similar to Textile or RedCloth, only with a little different syntax. 
     *
     * @param string $text String to "flay"
     * @param boolean $allowHtml Set to true if if html is allowed
     * @return string "Flayed" text
     * @todo Change this. We need a real Textile parser.
     */
    function flay($text, $allowHtml=false)
    {
        return Flay::toHtml($text, false, $allowHtml);
    }

}

?>