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<?php

/**

 * Text Helper

 *

 * Text manipulations: Highlight, excerpt, truncate, strip of links, convert email addresses to mailto: links...

 *

 * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)

 * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)

 *

 * Licensed under The MIT License

 * For full copyright and license information, please see the LICENSE.txt

 * Redistributions of files must retain the above copyright notice.

 *

 * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)

 * @link          http://cakephp.org CakePHP(tm) Project

 * @package       Cake.View.Helper

 * @since         CakePHP(tm) v 0.10.0.1076

 * @license       http://www.opensource.org/licenses/mit-license.php MIT License

 */

App::uses('AppHelper', 'View/Helper');

App::uses('Hash', 'Utility');

/**

 * Text helper library.

 *

 * Text manipulations: Highlight, excerpt, truncate, strip of links, convert email addresses to mailto: links...

 *

 * @package       Cake.View.Helper

 * @property      HtmlHelper $Html

 * @link http://book.cakephp.org/2.0/en/core-libraries/helpers/text.html

 * @see String

 */

class TextHelper extends AppHelper {

/**

 * helpers

 *

 * @var array

 */

	public $helpers = array('Html');

/**

 * An array of md5sums and their contents.

 * Used when inserting links into text.

 *

 * @var array

 */

	protected $_placeholders = array();

/**

 * String utility instance

 *

 * @var stdClass

 */

	protected $_engine;

/**

 * Constructor

 *

 * ### Settings:

 *

 * - `engine` Class name to use to replace String functionality.

 *            The class needs to be placed in the `Utility` directory.

 *

 * @param View $View the view object the helper is attached to.

 * @param array $settings Settings array Settings array

 * @throws CakeException when the engine class could not be found.

 */

	public function __construct(View $View, $settings = array()) {

		$settings = Hash::merge(array('engine' => 'String'), $settings);

		parent::__construct($View, $settings);

		list($plugin, $engineClass) = pluginSplit($settings['engine'], true);

		App::uses($engineClass, $plugin . 'Utility');

		if (class_exists($engineClass)) {

			$this->_engine = new $engineClass($settings);

		} else {

			throw new CakeException(__d('cake_dev', '%s could not be found', $engineClass));

		}

	}

/**

 * Call methods from String utility class

 * @return mixed Whatever is returned by called method, or false on failure

 */

	public function __call($method, $params) {

		return call_user_func_array(array($this->_engine, $method), $params);

	}

/**

 * Adds links (<a href=....) to a given text, by finding text that begins with

 * strings like http:// and ftp://.

 *

 * ### Options

 *

 * - `escape` Control HTML escaping of input. Defaults to true.

 *

 * @param string $text Text

 * @param array $options Array of HTML options, and options listed above.

 * @return string The text with links

 * @link http://book.cakephp.org/2.0/en/core-libraries/helpers/text.html#TextHelper::autoLinkUrls

 */

	public function autoLinkUrls($text, $options = array()) {

		$this->_placeholders = array();

		$options += array('escape' => true);

		$pattern = '#(?<!href="|src="|">)((?:https?|ftp|nntp)://[\p{L}0-9.\-:]+(?:[/?][^\s<]*)?)#ui';

		$text = preg_replace_callback(

			$pattern,

			array(&$this, '_insertPlaceHolder'),

			$text

		);

		$text = preg_replace_callback(

			'#(?<!href="|">)(?<!\b[[:punct:]])(?<!http://|https://|ftp://|nntp://)www.[^\n\%\ <]+[^<\n\%\,\.\ <](?<!\))#i',

			array(&$this, '_insertPlaceHolder'),

			$text

		);

		if ($options['escape']) {

			$text = h($text);

		}

		return $this->_linkUrls($text, $options);

	}

/**

 * Saves the placeholder for a string, for later use. This gets around double

 * escaping content in URL's.

 *

 * @param array $matches An array of regexp matches.

 * @return string Replaced values.

 */

	protected function _insertPlaceHolder($matches) {

		$key = md5($matches[0]);

		$this->_placeholders[$key] = $matches[0];

		return $key;

	}

/**

 * Replace placeholders with links.

 *

 * @param string $text The text to operate on.

 * @param array $htmlOptions The options for the generated links.

 * @return string The text with links inserted.

 */

	protected function _linkUrls($text, $htmlOptions) {

		$replace = array();

		foreach ($this->_placeholders as $hash => $url) {

			$link = $url;

			if (!preg_match('#^[a-z]+\://#', $url)) {

				$url = 'http://' . $url;

			}

			$replace[$hash] = $this->Html->link($link, $url, $htmlOptions);

		}

		return strtr($text, $replace);

	}

/**

 * Links email addresses

 *

 * @param string $text The text to operate on

 * @param array $options An array of options to use for the HTML.

 * @return string

 * @see TextHelper::autoLinkEmails()

 */

	protected function _linkEmails($text, $options) {

		$replace = array();

		foreach ($this->_placeholders as $hash => $url) {

			$replace[$hash] = $this->Html->link($url, 'mailto:' . $url, $options);

		}

		return strtr($text, $replace);

	}

/**

 * Adds email links (<a href="mailto:....) to a given text.

 *

 * ### Options

 *

 * - `escape` Control HTML escaping of input. Defaults to true.

 *

 * @param string $text Text

 * @param array $options Array of HTML options, and options listed above.

 * @return string The text with links

 * @link http://book.cakephp.org/2.0/en/core-libraries/helpers/text.html#TextHelper::autoLinkEmails

 */

	public function autoLinkEmails($text, $options = array()) {

		$options += array('escape' => true);

		$this->_placeholders = array();

		$atom = '[\p{L}0-9!#$%&\'*+\/=?^_`{|}~-]';

		$text = preg_replace_callback(

			'/(?<=\s|^|\()(' . $atom . '*(?:\.' . $atom . '+)*@[\p{L}0-9-]+(?:\.[\p{L}0-9-]+)+)/ui',

			array(&$this, '_insertPlaceholder'),

			$text

		);

		if ($options['escape']) {

			$text = h($text);

		}

		return $this->_linkEmails($text, $options);

	}

/**

 * Convert all links and email addresses to HTML links.

 *

 * ### Options

 *

 * - `escape` Control HTML escaping of input. Defaults to true.

 *

 * @param string $text Text

 * @param array $options Array of HTML options, and options listed above.

 * @return string The text with links

 * @link http://book.cakephp.org/2.0/en/core-libraries/helpers/text.html#TextHelper::autoLink

 */

	public function autoLink($text, $options = array()) {

		$text = $this->autoLinkUrls($text, $options);

		return $this->autoLinkEmails($text, array_merge($options, array('escape' => false)));

	}

/**

 * @see String::highlight()

 *

 * @param string $text Text to search the phrase in

 * @param string $phrase The phrase that will be searched

 * @param array $options An array of html attributes and options.

 * @return string The highlighted text

 * @link http://book.cakephp.org/2.0/en/core-libraries/helpers/text.html#TextHelper::highlight

 */

	public function highlight($text, $phrase, $options = array()) {

		return $this->_engine->highlight($text, $phrase, $options);

	}

/**

 * Formats paragraphs around given text for all line breaks

 *  <br /> added for single line return

 *  <p> added for double line return

 *

 * @param string $text Text

 * @return string The text with proper <p> and <br /> tags

 * @link http://book.cakephp.org/2.0/en/core-libraries/helpers/text.html#TextHelper::autoParagraph

 */

	public function autoParagraph($text) {

		if (trim($text) !== '') {

			$text = preg_replace('|<br[^>]*>\s*<br[^>]*>|i', "\n\n", $text . "\n");

			$text = preg_replace("/\n\n+/", "\n\n", str_replace(array("\r\n", "\r"), "\n", $text));

			$texts = preg_split('/\n\s*\n/', $text, -1, PREG_SPLIT_NO_EMPTY);

			$text = '';

			foreach ($texts as $txt) {

				$text .= '<p>' . nl2br(trim($txt, "\n")) . "</p>\n";

			}

			$text = preg_replace('|<p>\s*</p>|', '', $text);

		}

		return $text;

	}

/**

 * @see String::stripLinks()

 *

 * @param string $text Text

 * @return string The text without links

 * @link http://book.cakephp.org/2.0/en/core-libraries/helpers/text.html#TextHelper::stripLinks

 */

	public function stripLinks($text) {

		return $this->_engine->stripLinks($text);

	}

/**

 * @see String::truncate()

 *

 * @param string $text String to truncate.

 * @param integer $length Length of returned string, including ellipsis.

 * @param array $options An array of html attributes and options.

 * @return string Trimmed string.

 * @link http://book.cakephp.org/2.0/en/core-libraries/helpers/text.html#TextHelper::truncate

 */

	public function truncate($text, $length = 100, $options = array()) {

		return $this->_engine->truncate($text, $length, $options);

	}

/**

 * @see String::excerpt()

 *

 * @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 Modified string

 * @link http://book.cakephp.org/2.0/en/core-libraries/helpers/text.html#TextHelper::excerpt

 */

	public function excerpt($text, $phrase, $radius = 100, $ending = '...') {

		return $this->_engine->excerpt($text, $phrase, $radius, $ending);

	}

/**

 * @see String::toList()

 *

 * @param array $list The list to be joined

 * @param string $and The word used to join the last and second last items together with. Defaults to 'and'

 * @param string $separator The separator used to join all the other items together. Defaults to ', '

 * @return string The glued together string.

 * @link http://book.cakephp.org/2.0/en/core-libraries/helpers/text.html#TextHelper::toList

 */

	public function toList($list, $and = 'and', $separator = ', ') {

		return $this->_engine->toList($list, $and, $separator);

	}

}