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<?php

/**

 * Html Helper class file.

 *

 * Simplifies the construction of HTML elements.

 *

 * 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 0.9.1

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

 */

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

App::uses('CakeResponse', 'Network');

/**

 * Html Helper class for easy use of HTML widgets.

 *

 * HtmlHelper encloses all methods needed while working with HTML pages.

 *

 * @package       Cake.View.Helper

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

 */

class HtmlHelper extends AppHelper {

/**

 * Reference to the Response object

 *

 * @var CakeResponse

 */

	public $response;

/**

 * html tags used by this helper.

 *

 * @var array

 */

	protected $_tags = array(

		'meta' => '<meta%s/>',

		'metalink' => '<link href="%s"%s/>',

		'link' => '<a href="%s"%s>%s</a>',

		'mailto' => '<a href="mailto:%s"%s>%s</a>',

		'form' => '<form action="%s"%s>',

		'formend' => '</form>',

		'input' => '<input name="%s"%s/>',

		'textarea' => '<textarea name="%s"%s>%s</textarea>',

		'hidden' => '<input type="hidden" name="%s"%s/>',

		'checkbox' => '<input type="checkbox" name="%s"%s/>',

		'checkboxmultiple' => '<input type="checkbox" name="%s[]"%s />',

		'radio' => '<input type="radio" name="%s" id="%s"%s />%s',

		'selectstart' => '<select name="%s"%s>',

		'selectmultiplestart' => '<select name="%s[]"%s>',

		'selectempty' => '<option value=""%s>&nbsp;</option>',

		'selectoption' => '<option value="%s"%s>%s</option>',

		'selectend' => '</select>',

		'optiongroup' => '<optgroup label="%s"%s>',

		'optiongroupend' => '</optgroup>',

		'checkboxmultiplestart' => '',

		'checkboxmultipleend' => '',

		'password' => '<input type="password" name="%s"%s/>',

		'file' => '<input type="file" name="%s"%s/>',

		'file_no_model' => '<input type="file" name="%s"%s/>',

		'submit' => '<input%s/>',

		'submitimage' => '<input type="image" src="%s"%s/>',

		'button' => '<button%s>%s</button>',

		'image' => '<img src="%s"%s/>',

		'tableheader' => '<th%s>%s</th>',

		'tableheaderrow' => '<tr%s>%s</tr>',

		'tablecell' => '<td%s>%s</td>',

		'tablerow' => '<tr%s>%s</tr>',

		'block' => '<div%s>%s</div>',

		'blockstart' => '<div%s>',

		'blockend' => '</div>',

		'hiddenblock' => '<div style="display:none;">%s</div>',

		'tag' => '<%s%s>%s</%s>',

		'tagstart' => '<%s%s>',

		'tagend' => '</%s>',

		'tagselfclosing' => '<%s%s/>',

		'para' => '<p%s>%s</p>',

		'parastart' => '<p%s>',

		'label' => '<label for="%s"%s>%s</label>',

		'fieldset' => '<fieldset%s>%s</fieldset>',

		'fieldsetstart' => '<fieldset><legend>%s</legend>',

		'fieldsetend' => '</fieldset>',

		'legend' => '<legend>%s</legend>',

		'css' => '<link rel="%s" type="text/css" href="%s"%s/>',

		'style' => '<style type="text/css"%s>%s</style>',

		'charset' => '<meta http-equiv="Content-Type" content="text/html; charset=%s" />',

		'ul' => '<ul%s>%s</ul>',

		'ol' => '<ol%s>%s</ol>',

		'li' => '<li%s>%s</li>',

		'error' => '<div%s>%s</div>',

		'javascriptblock' => '<script%s>%s</script>',

		'javascriptstart' => '<script>',

		'javascriptlink' => '<script type="text/javascript" src="%s"%s></script>',

		'javascriptend' => '</script>'

	);

/**

 * Breadcrumbs.

 *

 * @var array

 */

	protected $_crumbs = array();

/**

 * Names of script & css files that have been included once

 *

 * @var array

 */

	protected $_includedAssets = array();

/**

 * Options for the currently opened script block buffer if any.

 *

 * @var array

 */

	protected $_scriptBlockOptions = array();

/**

 * Document type definitions

 *

 * @var array

 */

	protected $_docTypes = array(

		'html4-strict' => '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">',

		'html4-trans' => '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">',

		'html4-frame' => '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN" "http://www.w3.org/TR/html4/frameset.dtd">',

		'html5' => '<!DOCTYPE html>',

		'xhtml-strict' => '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">',

		'xhtml-trans' => '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">',

		'xhtml-frame' => '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd">',

		'xhtml11' => '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">'

	);

/**

 * Constructor

 *

 * ### Settings

 *

 * - `configFile` A file containing an array of tags you wish to redefine.

 *

 * ### Customizing tag sets

 *

 * Using the `configFile` option you can redefine the tag HtmlHelper will use.

 * The file named should be compatible with HtmlHelper::loadConfig().

 *

 * @param View $View The View this helper is being attached to.

 * @param array $settings Configuration settings for the helper.

 */

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

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

		if (is_object($this->_View->response)) {

			$this->response = $this->_View->response;

		} else {

			$this->response = new CakeResponse();

		}

		if (!empty($settings['configFile'])) {

			$this->loadConfig($settings['configFile']);

		}

	}

/**

 * Adds a link to the breadcrumbs array.

 *

 * @param string $name Text for link

 * @param string $link URL for link (if empty it won't be a link)

 * @param string|array $options Link attributes e.g. array('id' => 'selected')

 * @return $this

 * @see HtmlHelper::link() for details on $options that can be used.

 * @link http://book.cakephp.org/2.0/en/core-libraries/helpers/html.html#creating-breadcrumb-trails-with-htmlhelper

 */

	public function addCrumb($name, $link = null, $options = null) {

		$this->_crumbs[] = array($name, $link, $options);

		return $this;

	}

/**

 * Returns a doctype string.

 *

 * Possible doctypes:

 *

 *  - html4-strict:  HTML4 Strict.

 *  - html4-trans:  HTML4 Transitional.

 *  - html4-frame:  HTML4 Frameset.

 *  - html5: HTML5. Default value.

 *  - xhtml-strict: XHTML1 Strict.

 *  - xhtml-trans: XHTML1 Transitional.

 *  - xhtml-frame: XHTML1 Frameset.

 *  - xhtml11: XHTML1.1.

 *

 * @param string $type Doctype to use.

 * @return string|null Doctype string

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

 */

	public function docType($type = 'html5') {

		if (isset($this->_docTypes[$type])) {

			return $this->_docTypes[$type];

		}

		return null;

	}

/**

 * Creates a link to an external resource and handles basic meta tags

 *

 * Create a meta tag that is output inline:

 *

 * `$this->Html->meta('icon', 'favicon.ico');

 *

 * Append the meta tag to `$scripts_for_layout`:

 *

 * `$this->Html->meta('description', 'A great page', array('inline' => false));`

 *

 * Append the meta tag to custom view block:

 *

 * `$this->Html->meta('description', 'A great page', array('block' => 'metaTags'));`

 *

 * ### Options

 *

 * - `inline` Whether or not the link element should be output inline. Set to false to

 *   have the meta tag included in `$scripts_for_layout`, and appended to the 'meta' view block.

 * - `block` Choose a custom block to append the meta tag to. Using this option

 *   will override the inline option.

 *

 * @param string $type The title of the external resource

 * @param string|array $url The address of the external resource or string for content attribute

 * @param array $options Other attributes for the generated tag. If the type attribute is html,

 *    rss, atom, or icon, the mime-type is returned.

 * @return string A completed `<link />` element.

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

 */

	public function meta($type, $url = null, $options = array()) {

		$options += array('inline' => true, 'block' => null);

		if (!$options['inline'] && empty($options['block'])) {

			$options['block'] = __FUNCTION__;

		}

		unset($options['inline']);

		if (!is_array($type)) {

			$types = array(

				'rss' => array('type' => 'application/rss+xml', 'rel' => 'alternate', 'title' => $type, 'link' => $url),

				'atom' => array('type' => 'application/atom+xml', 'title' => $type, 'link' => $url),

				'icon' => array('type' => 'image/x-icon', 'rel' => 'icon', 'link' => $url),

				'keywords' => array('name' => 'keywords', 'content' => $url),

				'description' => array('name' => 'description', 'content' => $url),

			);

			if ($type === 'icon' && $url === null) {

				$types['icon']['link'] = 'favicon.ico';

			}

			if (isset($types[$type])) {

				$type = $types[$type];

			} elseif (!isset($options['type']) && $url !== null) {

				if (is_array($url) && isset($url['ext'])) {

					$type = $types[$url['ext']];

				} else {

					$type = $types['rss'];

				}

			} elseif (isset($options['type']) && isset($types[$options['type']])) {

				$type = $types[$options['type']];

				unset($options['type']);

			} else {

				$type = array();

			}

		}

		$options += $type;

		$out = null;

		if (isset($options['link'])) {

			$options['link'] = $this->assetUrl($options['link']);

			if (isset($options['rel']) && $options['rel'] === 'icon') {

				$out = sprintf($this->_tags['metalink'], $options['link'], $this->_parseAttributes($options, array('block', 'link')));

				$options['rel'] = 'shortcut icon';

			}

			$out .= sprintf($this->_tags['metalink'], $options['link'], $this->_parseAttributes($options, array('block', 'link')));

		} else {

			$out = sprintf($this->_tags['meta'], $this->_parseAttributes($options, array('block', 'type')));

		}

		if (empty($options['block'])) {

			return $out;

		}

		$this->_View->append($options['block'], $out);

	}

/**

 * Returns a charset META-tag.

 *

 * @param string $charset The character set to be used in the meta tag. If empty,

 *  The App.encoding value will be used. Example: "utf-8".

 * @return string A meta tag containing the specified character set.

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

 */

	public function charset($charset = null) {

		if (empty($charset)) {

			$charset = strtolower(Configure::read('App.encoding'));

		}

		return sprintf($this->_tags['charset'], (!empty($charset) ? $charset : 'utf-8'));

	}

/**

 * Creates an HTML link.

 *

 * If $url starts with "http://" this is treated as an external link. Else,

 * it is treated as a path to controller/action and parsed with the

 * HtmlHelper::url() method.

 *

 * If the $url is empty, $title is used instead.

 *

 * ### Options

 *

 * - `escape` Set to false to disable escaping of title and attributes.

 * - `escapeTitle` Set to false to disable escaping of title. (Takes precedence over value of `escape`)

 * - `confirm` JavaScript confirmation message.

 *

 * @param string $title The content to be wrapped by <a> tags.

 * @param string|array $url Cake-relative URL or array of URL parameters, or external URL (starts with http://)

 * @param array $options Array of options and HTML attributes.

 * @param string $confirmMessage JavaScript confirmation message. This

 *   argument is deprecated as of 2.6. Use `confirm` key in $options instead.

 * @return string An `<a />` element.

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

 */

	public function link($title, $url = null, $options = array(), $confirmMessage = false) {

		$escapeTitle = true;

		if ($url !== null) {

			$url = $this->url($url);

		} else {

			$url = $this->url($title);

			$title = htmlspecialchars_decode($url, ENT_QUOTES);

			$title = h(urldecode($title));

			$escapeTitle = false;

		}

		if (isset($options['escapeTitle'])) {

			$escapeTitle = $options['escapeTitle'];

			unset($options['escapeTitle']);

		} elseif (isset($options['escape'])) {

			$escapeTitle = $options['escape'];

		}

		if ($escapeTitle === true) {

			$title = h($title);

		} elseif (is_string($escapeTitle)) {

			$title = htmlentities($title, ENT_QUOTES, $escapeTitle);

		}

		if (!empty($options['confirm'])) {

			$confirmMessage = $options['confirm'];

			unset($options['confirm']);

		}

		if ($confirmMessage) {

			$options['onclick'] = $this->_confirm($confirmMessage, 'return true;', 'return false;', $options);

		} elseif (isset($options['default']) && !$options['default']) {

			if (isset($options['onclick'])) {

				$options['onclick'] .= ' ';

			} else {

				$options['onclick'] = '';

			}

			$options['onclick'] .= 'event.returnValue = false; return false;';

			unset($options['default']);

		}

		return sprintf($this->_tags['link'], $url, $this->_parseAttributes($options), $title);

	}

/**

 * Creates a link element for CSS stylesheets.

 *

 * ### Usage

 *

 * Include one CSS file:

 *

 * `echo $this->Html->css('styles.css');`

 *

 * Include multiple CSS files:

 *

 * `echo $this->Html->css(array('one.css', 'two.css'));`

 *

 * Add the stylesheet to the `$scripts_for_layout` layout var:

 *

 * `$this->Html->css('styles.css', array('inline' => false));`

 *

 * Add the stylesheet to a custom block:

 *

 * `$this->Html->css('styles.css', array('block' => 'layoutCss'));`

 *

 * ### Options

 *

 * - `inline` If set to false, the generated tag will be appended to the 'css' block,

 *   and included in the `$scripts_for_layout` layout variable. Defaults to true.

 * - `once` Whether or not the css file should be checked for uniqueness. If true css

 *   files  will only be included once, use false to allow the same

 *   css to be included more than once per request.

 * - `block` Set the name of the block link/style tag will be appended to.

 *   This overrides the `inline` option.

 * - `plugin` False value will prevent parsing path as a plugin

 * - `rel` Defaults to 'stylesheet'. If equal to 'import' the stylesheet will be imported.

 * - `fullBase` If true the URL will get a full address for the css file.

 *

 * @param string|array $path The name of a CSS style sheet or an array containing names of

 *   CSS stylesheets. If `$path` is prefixed with '/', the path will be relative to the webroot

 *   of your application. Otherwise, the path will be relative to your CSS path, usually webroot/css.

 * @param array $options Array of options and HTML arguments.

 * @return string CSS <link /> or <style /> tag, depending on the type of link.

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

 */

	public function css($path, $options = array()) {

		if (!is_array($options)) {

			$rel = $options;

			$options = array();

			if ($rel) {

				$options['rel'] = $rel;

			}

			if (func_num_args() > 2) {

				$options = func_get_arg(2) + $options;

			}

			unset($rel);

		}

		$options += array(

			'block' => null,

			'inline' => true,

			'once' => false,

			'rel' => 'stylesheet'

		);

		if (!$options['inline'] && empty($options['block'])) {

			$options['block'] = __FUNCTION__;

		}

		unset($options['inline']);

		if (is_array($path)) {

			$out = '';

			foreach ($path as $i) {

				$out .= "\n\t" . $this->css($i, $options);

			}

			if (empty($options['block'])) {

				return $out . "\n";

			}

			return;

		}

		if ($options['once'] && isset($this->_includedAssets[__METHOD__][$path])) {

			return '';

		}

		unset($options['once']);

		$this->_includedAssets[__METHOD__][$path] = true;

		if (strpos($path, '//') !== false) {

			$url = $path;

		} else {

			$url = $this->assetUrl($path, $options + array('pathPrefix' => Configure::read('App.cssBaseUrl'), 'ext' => '.css'));

			$options = array_diff_key($options, array('fullBase' => null, 'pathPrefix' => null));

			if (Configure::read('Asset.filter.css')) {

				$pos = strpos($url, Configure::read('App.cssBaseUrl'));

				if ($pos !== false) {

					$url = substr($url, 0, $pos) . 'ccss/' . substr($url, $pos + strlen(Configure::read('App.cssBaseUrl')));

				}

			}

		}

		if ($options['rel'] === 'import') {

			$out = sprintf(

				$this->_tags['style'],

				$this->_parseAttributes($options, array('rel', 'block')),

				'@import url(' . $url . ');'

			);

		} else {

			$out = sprintf(

				$this->_tags['css'],

				$options['rel'],

				$url,

				$this->_parseAttributes($options, array('rel', 'block'))

			);

		}

		if (empty($options['block'])) {

			return $out;

		}

		$this->_View->append($options['block'], $out);

	}

/**

 * Returns one or many `<script>` tags depending on the number of scripts given.

 *

 * If the filename is prefixed with "/", the path will be relative to the base path of your

 * application. Otherwise, the path will be relative to your JavaScript path, usually webroot/js.

 *

 * ### Usage

 *

 * Include one script file:

 *

 * `echo $this->Html->script('styles.js');`

 *

 * Include multiple script files:

 *

 * `echo $this->Html->script(array('one.js', 'two.js'));`

 *

 * Add the script file to the `$scripts_for_layout` layout var:

 *

 * `$this->Html->script('styles.js', array('inline' => false));`

 *

 * Add the script file to a custom block:

 *

 * `$this->Html->script('styles.js', array('block' => 'bodyScript'));`

 *

 * ### Options

 *

 * - `inline` Whether script should be output inline or into `$scripts_for_layout`. When set to false,

 *   the script tag will be appended to the 'script' view block as well as `$scripts_for_layout`.

 * - `block` The name of the block you want the script appended to. Leave undefined to output inline.

 *   Using this option will override the inline option.

 * - `once` Whether or not the script should be checked for uniqueness. If true scripts will only be

 *   included once, use false to allow the same script to be included more than once per request.

 * - `plugin` False value will prevent parsing path as a plugin

 * - `fullBase` If true the url will get a full address for the script file.

 *

 * @param string|array $url String or array of javascript files to include

 * @param array|bool $options Array of options, and html attributes see above. If boolean sets $options['inline'] = value

 * @return mixed String of `<script />` tags or null if $inline is false or if $once is true and the file has been

 *   included before.

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

 */

	public function script($url, $options = array()) {

		if (is_bool($options)) {

			list($inline, $options) = array($options, array());

			$options['inline'] = $inline;

		}

		$options += array('block' => null, 'inline' => true, 'once' => true);

		if (!$options['inline'] && empty($options['block'])) {

			$options['block'] = __FUNCTION__;

		}

		unset($options['inline']);

		if (is_array($url)) {

			$out = '';

			foreach ($url as $i) {

				$out .= "\n\t" . $this->script($i, $options);

			}

			if (empty($options['block'])) {

				return $out . "\n";

			}

			return null;

		}

		if ($options['once'] && isset($this->_includedAssets[__METHOD__][$url])) {

			return null;

		}

		$this->_includedAssets[__METHOD__][$url] = true;

		if (strpos($url, '//') === false) {

			$url = $this->assetUrl($url, $options + array('pathPrefix' => Configure::read('App.jsBaseUrl'), 'ext' => '.js'));

			$options = array_diff_key($options, array('fullBase' => null, 'pathPrefix' => null));

			if (Configure::read('Asset.filter.js')) {

				$url = str_replace(Configure::read('App.jsBaseUrl'), 'cjs/', $url);

			}

		}

		$attributes = $this->_parseAttributes($options, array('block', 'once'));

		$out = sprintf($this->_tags['javascriptlink'], $url, $attributes);

		if (empty($options['block'])) {

			return $out;

		}

		$this->_View->append($options['block'], $out);

	}

/**

 * Wrap $script in a script tag.

 *

 * ### Options

 *

 * - `safe` (boolean) Whether or not the $script should be wrapped in <![CDATA[ ]]>

 * - `inline` (boolean) Whether or not the $script should be added to

 *   `$scripts_for_layout` / `script` block, or output inline. (Deprecated, use `block` instead)

 * - `block` Which block you want this script block appended to.

 *   Defaults to `script`.

 *

 * @param string $script The script to wrap

 * @param array $options The options to use. Options not listed above will be

 *    treated as HTML attributes.

 * @return mixed string or null depending on the value of `$options['block']`

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

 */

	public function scriptBlock($script, $options = array()) {

		$options += array('type' => 'text/javascript', 'safe' => true, 'inline' => true);

		if ($options['safe']) {

			$script = "\n" . '//<![CDATA[' . "\n" . $script . "\n" . '//]]>' . "\n";

		}

		if (!$options['inline'] && empty($options['block'])) {

			$options['block'] = 'script';

		}

		unset($options['inline'], $options['safe']);

		$attributes = $this->_parseAttributes($options, array('block'));

		$out = sprintf($this->_tags['javascriptblock'], $attributes, $script);

		if (empty($options['block'])) {

			return $out;

		}

		$this->_View->append($options['block'], $out);

	}

/**

 * Begin a script block that captures output until HtmlHelper::scriptEnd()

 * is called. This capturing block will capture all output between the methods

 * and create a scriptBlock from it.

 *

 * ### Options

 *

 * - `safe` Whether the code block should contain a CDATA

 * - `inline` Should the generated script tag be output inline or in `$scripts_for_layout`

 *

 * @param array $options Options for the code block.

 * @return void

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

 */

	public function scriptStart($options = array()) {

		$options += array('safe' => true, 'inline' => true);

		$this->_scriptBlockOptions = $options;

		ob_start();

	}

/**

 * End a Buffered section of JavaScript capturing.

 * Generates a script tag inline or in `$scripts_for_layout` depending on the settings

 * used when the scriptBlock was started

 *

 * @return mixed depending on the settings of scriptStart() either a script tag or null

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

 */

	public function scriptEnd() {

		$buffer = ob_get_clean();

		$options = $this->_scriptBlockOptions;

		$this->_scriptBlockOptions = array();

		return $this->scriptBlock($buffer, $options);

	}

/**

 * Builds CSS style data from an array of CSS properties

 *

 * ### Usage:

 *

 * ```

 * echo $this->Html->style(array('margin' => '10px', 'padding' => '10px'), true);

 *

 * // creates

 * 'margin:10px;padding:10px;'

 * ```

 *

 * @param array $data Style data array, keys will be used as property names, values as property values.

 * @param bool $oneline Whether or not the style block should be displayed on one line.

 * @return string CSS styling data

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

 */

	public function style($data, $oneline = true) {

		if (!is_array($data)) {

			return $data;

		}

		$out = array();

		foreach ($data as $key => $value) {

			$out[] = $key . ':' . $value . ';';

		}

		if ($oneline) {

			return implode(' ', $out);

		}

		return implode("\n", $out);

	}

/**

 * Returns the breadcrumb trail as a sequence of »-separated links.

 *

 * If `$startText` is an array, the accepted keys are:

 *

 * - `text` Define the text/content for the link.

 * - `url` Define the target of the created link.

 *

 * All other keys will be passed to HtmlHelper::link() as the `$options` parameter.

 *

 * @param string $separator Text to separate crumbs.

 * @param string|array|bool $startText This will be the first crumb, if false it defaults to first crumb in array. Can

 *   also be an array, see above for details.

 * @return string|null Composed bread crumbs

 * @link http://book.cakephp.org/2.0/en/core-libraries/helpers/html.html#creating-breadcrumb-trails-with-htmlhelper

 */

	public function getCrumbs($separator = '»', $startText = false) {

		$crumbs = $this->_prepareCrumbs($startText);

		if (!empty($crumbs)) {

			$out = array();

			foreach ($crumbs as $crumb) {

				if (!empty($crumb[1])) {

					$out[] = $this->link($crumb[0], $crumb[1], $crumb[2]);

				} else {

					$out[] = $crumb[0];

				}

			}

			return implode($separator, $out);

		}

		return null;

	}

/**

 * Returns breadcrumbs as a (x)html list

 *

 * This method uses HtmlHelper::tag() to generate list and its elements. Works

 * similar to HtmlHelper::getCrumbs(), so it uses options which every

 * crumb was added with.

 *

 * ### Options

 * - `separator` Separator content to insert in between breadcrumbs, defaults to ''

 * - `firstClass` Class for wrapper tag on the first breadcrumb, defaults to 'first'

 * - `lastClass` Class for wrapper tag on current active page, defaults to 'last'

 *

 * @param array $options Array of html attributes to apply to the generated list elements.

 * @param string|array|bool $startText This will be the first crumb, if false it defaults to first crumb in array. Can

 *   also be an array, see `HtmlHelper::getCrumbs` for details.

 * @return string|null breadcrumbs html list

 * @link http://book.cakephp.org/2.0/en/core-libraries/helpers/html.html#creating-breadcrumb-trails-with-htmlhelper

 */

	public function getCrumbList($options = array(), $startText = false) {

		$defaults = array('firstClass' => 'first', 'lastClass' => 'last', 'separator' => '', 'escape' => true);

		$options = (array)$options + $defaults;

		$firstClass = $options['firstClass'];

		$lastClass = $options['lastClass'];

		$separator = $options['separator'];

		$escape = $options['escape'];

		unset($options['firstClass'], $options['lastClass'], $options['separator'], $options['escape']);

		$crumbs = $this->_prepareCrumbs($startText, $escape);

		if (empty($crumbs)) {

			return null;

		}

		$result = '';

		$crumbCount = count($crumbs);

		$ulOptions = $options;

		foreach ($crumbs as $which => $crumb) {

			$options = array();

			if (empty($crumb[1])) {

				$elementContent = $crumb[0];

			} else {

				$elementContent = $this->link($crumb[0], $crumb[1], $crumb[2]);

			}

			if (!$which && $firstClass !== false) {

				$options['class'] = $firstClass;

			} elseif ($which == $crumbCount - 1 && $lastClass !== false) {

				$options['class'] = $lastClass;

			}

			if (!empty($separator) && ($crumbCount - $which >= 2)) {

				$elementContent .= $separator;

			}

			$result .= $this->tag('li', $elementContent, $options);

		}

		return $this->tag('ul', $result, $ulOptions);

	}

/**

 * Prepends startText to crumbs array if set

 *

 * @param string $startText Text to prepend

 * @param bool $escape If the output should be escaped or not

 * @return array Crumb list including startText (if provided)

 */

	protected function _prepareCrumbs($startText, $escape = true) {

		$crumbs = $this->_crumbs;

		if ($startText) {

			if (!is_array($startText)) {

				$startText = array(

					'url' => '/',

					'text' => $startText

				);

			}

			$startText += array('url' => '/', 'text' => __d('cake', 'Home'));

			list($url, $text) = array($startText['url'], $startText['text']);

			unset($startText['url'], $startText['text']);

			array_unshift($crumbs, array($text, $url, $startText + array('escape' => $escape)));

		}

		return $crumbs;

	}

/**

 * Creates a formatted IMG element.

 *

 * This method will set an empty alt attribute if one is not supplied.

 *

 * ### Usage:

 *

 * Create a regular image:

 *

 * `echo $this->Html->image('cake_icon.png', array('alt' => 'CakePHP'));`

 *

 * Create an image link:

 *

 * `echo $this->Html->image('cake_icon.png', array('alt' => 'CakePHP', 'url' => 'http://cakephp.org'));`

 *

 * ### Options:

 *

 * - `url` If provided an image link will be generated and the link will point at

 *   `$options['url']`.

 * - `fullBase` If true the src attribute will get a full address for the image file.

 * - `plugin` False value will prevent parsing path as a plugin

 *

 * @param string $path Path to the image file, relative to the app/webroot/img/ directory.

 * @param array $options Array of HTML attributes. See above for special options.

 * @return string completed img tag

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

 */

	public function image($path, $options = array()) {

		$path = $this->assetUrl($path, $options + array('pathPrefix' => Configure::read('App.imageBaseUrl')));

		$options = array_diff_key($options, array('fullBase' => null, 'pathPrefix' => null));

		if (!isset($options['alt'])) {

			$options['alt'] = '';

		}

		$url = false;

		if (!empty($options['url'])) {

			$url = $options['url'];

			unset($options['url']);

		}

		$image = sprintf($this->_tags['image'], $path, $this->_parseAttributes($options));

		if ($url) {

			return sprintf($this->_tags['link'], $this->url($url), null, $image);

		}

		return $image;

	}

/**

 * Returns a row of formatted and named TABLE headers.

 *

 * @param array $names Array of tablenames. Each tablename also can be a key that points to an array with a set

 *     of attributes to its specific tag

 * @param array $trOptions HTML options for TR elements.

 * @param array $thOptions HTML options for TH elements.

 * @return string Completed table headers

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

 */

	public function tableHeaders($names, $trOptions = null, $thOptions = null) {

		$out = array();

		foreach ($names as $arg) {

			if (!is_array($arg)) {

				$out[] = sprintf($this->_tags['tableheader'], $this->_parseAttributes($thOptions), $arg);

			} else {

				$out[] = sprintf($this->_tags['tableheader'], $this->_parseAttributes(current($arg)), key($arg));

			}

		}

		return sprintf($this->_tags['tablerow'], $this->_parseAttributes($trOptions), implode(' ', $out));

	}

/**

 * Returns a formatted string of table rows (TR's with TD's in them).

 *

 * @param array $data Array of table data

 * @param array $oddTrOptions HTML options for odd TR elements if true useCount is used

 * @param array $evenTrOptions HTML options for even TR elements

 * @param bool $useCount adds class "column-$i"

 * @param bool $continueOddEven If false, will use a non-static $count variable,

 *    so that the odd/even count is reset to zero just for that call.

 * @return string Formatted HTML

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

 */

	public function tableCells($data, $oddTrOptions = null, $evenTrOptions = null, $useCount = false, $continueOddEven = true) {

		if (empty($data[0]) || !is_array($data[0])) {

			$data = array($data);

		}

		if ($oddTrOptions === true) {

			$useCount = true;

			$oddTrOptions = null;

		}

		if ($evenTrOptions === false) {

			$continueOddEven = false;

			$evenTrOptions = null;

		}

		if ($continueOddEven) {

			static $count = 0;

		} else {

			$count = 0;

		}

		foreach ($data as $line) {

			$count++;

			$cellsOut = array();

			$i = 0;

			foreach ($line as $cell) {

				$cellOptions = array();

				if (is_array($cell)) {

					$cellOptions = $cell[1];

					$cell = $cell[0];

				}

				if ($useCount) {

					if (isset($cellOptions['class'])) {

						$cellOptions['class'] .= ' column-' . ++$i;

					} else {

						$cellOptions['class'] = 'column-' . ++$i;

					}

				}

				$cellsOut[] = sprintf($this->_tags['tablecell'], $this->_parseAttributes($cellOptions), $cell);

			}

			$options = $this->_parseAttributes($count % 2 ? $oddTrOptions : $evenTrOptions);

			$out[] = sprintf($this->_tags['tablerow'], $options, implode(' ', $cellsOut));

		}

		return implode("\n", $out);

	}

/**

 * Returns a formatted block tag, i.e DIV, SPAN, P.

 *

 * ### Options

 *

 * - `escape` Whether or not the contents should be html_entity escaped.

 *

 * @param string $name Tag name.

 * @param string $text String content that will appear inside the div element.

 *   If null, only a start tag will be printed

 * @param array $options Additional HTML attributes of the DIV tag, see above.

 * @return string The formatted tag element

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

 */

	public function tag($name, $text = null, $options = array()) {

		if (empty($name)) {

			return $text;

		}

		if (isset($options['escape']) && $options['escape']) {

			$text = h($text);

			unset($options['escape']);

		}

		if ($text === null) {

			$tag = 'tagstart';

		} else {

			$tag = 'tag';

		}

		return sprintf($this->_tags[$tag], $name, $this->_parseAttributes($options), $text, $name);

	}

/**

 * Returns a formatted existent block of $tags

 *

 * @param string $tag Tag name

 * @return string Formatted block

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

 */

	public function useTag($tag) {

		if (!isset($this->_tags[$tag])) {

			return '';

		}

		$args = func_get_args();

		array_shift($args);

		foreach ($args as &$arg) {

			if (is_array($arg)) {

				$arg = $this->_parseAttributes($arg);

			}

		}

		return vsprintf($this->_tags[$tag], $args);

	}

/**

 * Returns a formatted DIV tag for HTML FORMs.

 *

 * ### Options

 *

 * - `escape` Whether or not the contents should be html_entity escaped.

 *

 * @param string $class CSS class name of the div element.

 * @param string $text String content that will appear inside the div element.

 *   If null, only a start tag will be printed

 * @param array $options Additional HTML attributes of the DIV tag

 * @return string The formatted DIV element

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

 */

	public function div($class = null, $text = null, $options = array()) {

		if (!empty($class)) {

			$options['class'] = $class;

		}

		return $this->tag('div', $text, $options);

	}

/**

 * Returns a formatted P tag.

 *

 * ### Options