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<?php
/**
* Methods for displaying presentation data in the view.
*
* PHP versions 4 and 5
*
* CakePHP(tm) : Rapid Development Framework (http://www.cakephp.org)
* Copyright 2005-2009, Cake Software Foundation, Inc. (http://www.cakefoundation.org)
*
* Licensed under The MIT License
* Redistributions of files must retain the above copyright notice.
*
* @filesource
* @copyright Copyright 2005-2009, Cake Software Foundation, Inc. (http://www.cakefoundation.org)
* @link http://www.cakefoundation.org/projects/info/cakephp CakePHP(tm) Project
* @package cake
* @subpackage cake.cake.libs.view
* @since CakePHP(tm) v 0.10.0.1076
* @license http://www.opensource.org/licenses/mit-license.php The MIT License
*/

/**
* Included libraries.
*/
App::import('Core', 'ClassRegistry');
App::import('View', 'Helper', false);

/**
* View, the V in the MVC triad.
*
* Class holding methods for displaying presentation data.
*
* @package cake
* @subpackage cake.cake.libs.view
*/
class View extends Object {

/**
* Path parts for creating links in views.
*
* @var string Base URL
* @access public
*/
var $base = null;

/**
* Stores the current URL (for links etc.)
*
* @var string Current URL
*/
var $here = null;

/**
* Name of the plugin.
*
* @link http://manual.cakephp.org/chapter/plugins
* @var string
*/
var $plugin = null;

/**
* Name of the controller.
*
* @var string Name of controller
* @access public
*/
var $name = null;

/**
* Action to be performed.
*
* @var string Name of action
* @access public
*/
var $action = null;

/**
* Array of parameter data
*
* @var array Parameter data
*/
var $params = array();

/**
* Current passed params
*
* @var mixed
*/
var $passedArgs = array();

/**
* Array of data
*
* @var array Parameter data
*/
var $data = array();

/**
* An array of names of built-in helpers to include.
*
* @var mixed A single name as a string or a list of names as an array.
* @access public
*/
var $helpers = array('Html');

/**
* Path to View.
*
* @var string Path to View
*/
var $viewPath = null;

/**
* Variables for the view
*
* @var array
* @access public
*/
var $viewVars = array();

/**
* Name of layout to use with this View.
*
* @var string
* @access public
*/
var $layout = 'default';

/**
* Path to Layout.
*
* @var string Path to Layout
*/
var $layoutPath = null;

/**
* Turns on or off Cake's conventional mode of rendering views. On by default.
*
* @var boolean
* @access public
*/
var $autoRender = true;

/**
* Turns on or off Cake's conventional mode of finding layout files. On by default.
*
* @var boolean
* @access public
*/
var $autoLayout = true;

/**
* File extension. Defaults to Cake's template ".ctp".
*
* @var string
*/
var $ext = '.ctp';

/**
* Sub-directory for this view file.
*
* @var string
*/
var $subDir = null;

/**
* Theme name.
*
* @var string
*/
var $themeWeb = null;

/**
* Used to define methods a controller that will be cached.
*
* @see Controller::$cacheAction
* @var mixed
* @access public
*/
var $cacheAction = false;

/**
* holds current errors for the model validation
*
* @var array
*/
var $validationErrors = array();

/**
* True when the view has been rendered.
*
* @var boolean
*/
var $hasRendered = false;

/**
* Array of loaded view helpers.
*
* @var array
*/
var $loaded = array();

/**
* True if in scope of model-specific region
*
* @var boolean
*/
var $modelScope = false;

/**
* Name of current model this view context is attached to
*
* @var string
*/
var $model = null;

/**
* Name of association model this view context is attached to
*
* @var string
*/
var $association = null;

/**
* Name of current model field this view context is attached to
*
* @var string
*/
var $field = null;

/**
* Suffix of current field this view context is attached to
*
* @var string
*/
var $fieldSuffix = null;

/**
* The current model ID this view context is attached to
*
* @var mixed
*/
var $modelId = null;

/**
* List of generated DOM UUIDs
*
* @var array
*/
var $uuids = array();

/**
* Holds View output.
*
* @var string
**/
var $output = false;

/**
* List of variables to collect from the associated controller
*
* @var array
* @access protected
*/
var $__passedVars = array(
'viewVars', 'action', 'autoLayout', 'autoRender', 'ext', 'base', 'webroot',
'helpers', 'here', 'layout', 'name', 'layoutPath', 'viewPath',
'params', 'data', 'plugin', 'passedArgs', 'cacheAction'
);

/**
* Scripts (and/or other <head /> tags) for the layout
*
* @var array
* @access private
*/
var $__scripts = array();

/**
* Holds an array of paths.
*
* @var array
*/
var $__paths = array();

/**
* Constructor
*
* @return View
*/
function __construct(&$controller, $register = true) {
if (is_object($controller)) {
$count = count($this->__passedVars);
for ($j = 0; $j < $count; $j++) {
$var = $this->__passedVars[$j];
$this->{$var} = $controller->{$var};
}
}
parent::__construct();

if ($register) {
ClassRegistry::addObject('view', $this);
}
}

/**
* Renders a piece of PHP with provided parameters and returns HTML, XML, or any other string.
*
* This realizes the concept of Elements, (or "partial layouts")
* and the $params array is used to send data to be used in the
* Element. Elements can be cached through use of the cache key.
*
* ### Special params
*
* - cache - enable caching for this element accepts boolean or strtotime compatible string.
* Can also be an array. If `cache` is an array,
* `time` is used to specify duration of cache.
* `key` can be used to create unique cache files.
*
* @param string $name Name of template file in the/app/views/elements/ folder
* @param array $params Array of data to be made available to the for rendered
* view (i.e. the Element)
* @return string Rendered Element
* @access public
*/
function element($name, $params = array(), $loadHelpers = false) {
$file = $plugin = $key = null;

if (isset($params['plugin'])) {
$plugin = $params['plugin'];
}

if (isset($this->plugin) && !$plugin) {
$plugin = $this->plugin;
}

if (isset($params['cache'])) {
$expires = '+1 day';

if (is_array($params['cache'])) {
$expires = $params['cache']['time'];
$key = Inflector::slug($params['cache']['key']);
} elseif ($params['cache'] !== true) {
$expires = $params['cache'];
$key = implode('_', array_keys($params));
}

if ($expires) {
$cacheFile = 'element_' . $key . '_' . $plugin . Inflector::slug($name);
$cache = cache('views' . DS . $cacheFile, null, $expires);

if (is_string($cache)) {
return $cache;
}
}
}
$paths = $this->_paths($plugin);

foreach ($paths as $path) {
if (file_exists($path . 'elements' . DS . $name . $this->ext)) {
$file = $path . 'elements' . DS . $name . $this->ext;
break;
}
}

if (is_file($file)) {
$params = array_merge_recursive($params, $this->loaded);
$element = $this->_render($file, array_merge($this->viewVars, $params), $loadHelpers);
if (isset($params['cache']) && isset($cacheFile) && isset($expires)) {
cache('views' . DS . $cacheFile, $element, $expires);
}
return $element;
}
$file = $paths[0] . 'elements' . DS . $name . $this->ext;

if (Configure::read() > 0) {
return "Not Found: " . $file;
}
}

/**
* Renders view for given action and layout. If $file is given, that is used
* for a view filename (e.g. customFunkyView.ctp).
*
* @param string $action Name of action to render for
* @param string $layout Layout to use
* @param string $file Custom filename for view
* @return string Rendered Element
*/
function render($action = null, $layout = null, $file = null) {
if ($this->hasRendered) {
return true;
}
$out = null;

if ($file != null) {
$action = $file;
}

if ($action !== false && $viewFileName = $this->_getViewFileName($action)) {
$out = $this->_render($viewFileName, $this->viewVars);
}

if ($layout === null) {
$layout = $this->layout;
}

if ($out !== false) {
if ($layout && $this->autoLayout) {
$out = $this->renderLayout($out, $layout);
$isCached = (
isset($this->loaded['cache']) &&
(($this->cacheAction != false)) && (Configure::read('Cache.check') === true)
);

if ($isCached) {
$replace = array('<cake:nocache>', '</cake:nocache>');
$out = str_replace($replace, '', $out);
}
}
$this->hasRendered = true;
} else {
$out = $this->_render($viewFileName, $this->viewVars);
$msg = __("Error in view %s, got: <blockquote>%s</blockquote>", true);
trigger_error(sprintf($msg, $viewFileName, $out), E_USER_ERROR);
}
return $out;
}

/**
* Renders a layout. Returns output from _render(). Returns false on error.
* Several variables are created for use in layout.
*
* - `title_for_layout` - contains page title
* - `content_for_layout` - contains rendered view file
* - `scripts_for_layout` - contains scripts added to header
* - `cakeDebug` - if debug is on, cake debug information is added.
*
* @param string $content_for_layout Content to render in a view, wrapped by the surrounding layout.
* @return mixed Rendered output, or false on error
*/
function renderLayout($content_for_layout, $layout = null) {
$layoutFileName = $this->_getLayoutFileName($layout);
if (empty($layoutFileName)) {
return $this->output;
}

$debug = '';

if (isset($this->viewVars['cakeDebug']) && Configure::read() > 2) {
$params = array('controller' => $this->viewVars['cakeDebug']);
$debug = View::element('dump', $params, false);
unset($this->viewVars['cakeDebug']);
}

$dataForLayout = array_merge($this->viewVars, array(
'content_for_layout' => $content_for_layout,
'scripts_for_layout' => join("\n\t", $this->__scripts),
'cakeDebug' => $debug
));

if (!isset($dataForLayout['title_for_layout'])) {
$dataForLayout['title_for_layout'] = Inflector::humanize($this->viewPath);
}

if (empty($this->loaded) && !empty($this->helpers)) {
$loadHelpers = true;
} else {
$loadHelpers = false;
$dataForLayout = array_merge($dataForLayout, $this->loaded);
}

$this->_triggerHelpers('beforeLayout');
$this->output = $this->_render($layoutFileName, $dataForLayout, $loadHelpers, true);

if ($this->output === false) {
$this->output = $this->_render($layoutFileName, $data_for_layout);
$msg = __("Error in layout %s, got: <blockquote>%s</blockquote>", true);
trigger_error(sprintf($msg, $layoutFileName, $this->output), E_USER_ERROR);
return false;
}

$this->_triggerHelpers('afterLayout');

return $this->output;
}

/**
* Fire a callback on all loaded Helpers. All helpers must implement this method,
* it is not checked before being called. You can add additional helper callbacks in AppHelper.
*
* @param string $callback name of callback fire.
* @access protected
* @return void
*/
function _triggerHelpers($callback) {
if (empty($this->loaded)) {
return false;
}
$helpers = array_keys($this->loaded);
foreach ($helpers as $helperName) {
$helper =& $this->loaded[$helperName];
if (is_object($helper)) {
if (is_subclass_of($helper, 'Helper')) {
$helper->{$callback}();
}
}
}
}

/**
* Render cached view
*
* @param string $filename the cache file to include
* @param string $timeStart the page render start time
*/
function renderCache($filename, $timeStart) {
ob_start();
include ($filename);

if (Configure::read() > 0 && $this->layout != 'xml') {
echo "<!-- Cached Render Time: " . round(getMicrotime() - $timeStart, 4) . "s -->";
}
$out = ob_get_clean();

if (preg_match('/^<!--cachetime:(\\d+)-->/', $out, $match)) {
if (time() >= $match['1']) {
@unlink($filename);
unset ($out);
return false;
} else {
if ($this->layout === 'xml') {
header('Content-type: text/xml');
}
$commentLength = strlen('<!--cachetime:' . $match['1'] . '-->');
echo substr($out, $commentLength);
return true;
}
}
}

/**
* Returns a list of variables available in the current View context
*
* @return array
* @access public
*/
function getVars() {
return array_keys($this->viewVars);
}

/**
* Returns the contents of the given View variable(s)
*
* @return array
* @access public
*/
function getVar($var) {
if (!isset($this->viewVars[$var])) {
return null;
} else {
return $this->viewVars[$var];
}
}

/**
* Adds a script block or other element to be inserted in $scripts_for_layout in
* the <head /> of a document layout
*
* @param string $name
* @param string $content
* @return void
* @access public
*/
function addScript($name, $content = null) {
if (empty($content)) {
if (!in_array($name, array_values($this->__scripts))) {
$this->__scripts[] = $name;
}
} else {
$this->__scripts[$name] = $content;
}
}

/**
* Generates a unique, non-random DOM ID for an object, based on the object type and the target URL.
*
* @param string $object Type of object, i.e. 'form' or 'link'
* @param string $url The object's target URL
* @return string
* @access public
*/
function uuid($object, $url) {
$c = 1;
$url = Router::url($url);
$hash = $object . substr(md5($object . $url), 0, 10);
while (in_array($hash, $this->uuids)) {
$hash = $object . substr(md5($object . $url . $c), 0, 10);
$c++;
}
$this->uuids[] = $hash;
return $hash;
}

/**
* Returns the entity reference of the current context as an array of identity parts
*
* @return array An array containing the identity elements of an entity
*/
function entity() {
$assoc = ($this->association) ? $this->association : $this->model;
return array_values(Set::filter(
array($assoc, $this->modelId, $this->field, $this->fieldSuffix)
));
}

/**
* Allows a template or element to set a variable that will be available in
* a layout or other element. Analagous to Controller::set.
*
* @param mixed $one A string or an array of data.
* @param mixed $two Value in case $one is a string (which then works as the key).
* Unused if $one is an associative array, otherwise serves as the values to $one's keys.
* @return void
*/
function set($one, $two = null) {
$data = null;
if (is_array($one)) {
if (is_array($two)) {
$data = array_combine($one, $two);
} else {
$data = $one;
}
} else {
$data = array($one => $two);
}
if ($data == null) {
return false;
}
$this->viewVars = array_merge($this->viewVars, $data);
}

/**
* Displays an error page to the user. Uses layouts/error.ctp to render the page.
*
* @param integer $code HTTP Error code (for instance: 404)
* @param string $name Name of the error (for instance: Not Found)
* @param string $message Error message as a web page
*/
function error($code, $name, $message) {
header ("HTTP/1.1 {$code} {$name}");
print ($this->_render(
$this->_getLayoutFileName('error'),
array('code' => $code, 'name' => $name, 'message' => $message)
));
}

/**
* Renders and returns output for given view filename with its
* array of data.
*
* @param string $___viewFn Filename of the view
* @param array $___dataForView Data to include in rendered view
* @return string Rendered output
* @access protected
*/
function _render($___viewFn, $___dataForView, $loadHelpers = true, $cached = false) {
$loadedHelpers = array();

if ($this->helpers != false && $loadHelpers === true) {
$loadedHelpers = $this->_loadHelpers($loadedHelpers, $this->helpers);
$helpers = array_keys($loadedHelpers);
$helperNames = array_map(array('Inflector', 'variable'), $helpers);

for ($i = count($helpers) - 1; $i >= 0; $i--) {
$name = $helperNames[$i];

${$name} =& $loadedHelpers[$helpers[$i]];
$this->loaded[$helperNames[$i]] =& ${$name};
$this->{$helpers[$i]} =& ${$name};
}
$this->_triggerHelpers('beforeRender');
}

extract($___dataForView, EXTR_SKIP);
ob_start();

if (Configure::read() > 0) {
include ($___viewFn);
} else {
@include ($___viewFn);
}

if ($loadHelpers === true) {
$this->_triggerHelpers('afterRender');
}

$out = ob_get_clean();
$caching = (
isset($this->loaded['cache']) &&
(($this->cacheAction != false)) && (Configure::read('Cache.check') === true)
);

if ($caching) {
if (is_a($this->loaded['cache'], 'CacheHelper')) {
$cache =& $this->loaded['cache'];
$cache->base = $this->base;
$cache->here = $this->here;
$cache->helpers = $this->helpers;
$cache->action = $this->action;
$cache->controllerName = $this->name;
$cache->layout = $this->layout;
$cache->cacheAction = $this->cacheAction;
$cache->cache($___viewFn, $out, $cached);
}
}
return $out;
}

/**
* Loads helpers, with their dependencies.
*
* @param array $loaded List of helpers that are already loaded.
* @param array $helpers List of helpers to load.
* @param string $parent holds name of helper, if loaded helper has helpers
* @return array
*/
function &_loadHelpers(&$loaded, $helpers, $parent = null) {
if (empty($loaded)) {
$helpers[] = 'Session';
}

foreach ($helpers as $i => $helper) {
$options = array();

if (!is_int($i)) {
$options = $helper;
$helper = $i;
}
$plugin = $this->plugin;

if (strpos($helper, '.') !== false) {
list($plugin, $helper) = explode('.', $helper);
}
$helperCn = $helper . 'Helper';

if (!isset($loaded[$helper])) {
if (!class_exists($helperCn)) {
$isLoaded = false;
if (!is_null($plugin)) {
$isLoaded = App::import('Helper', $plugin . '.' . $helper);
}
if (!$isLoaded) {
if (!App::import('Helper', $helper)) {
$this->cakeError('missingHelperFile', array(array(
'helper' => $helper,
'file' => Inflector::underscore($helper) . '.php',
'base' => $this->base
)));
return false;
}
}
if (!class_exists($helperCn)) {
$this->cakeError('missingHelperClass', array(array(
'helper' => $helper,
'file' => Inflector::underscore($helper) . '.php',
'base' => $this->base
)));
return false;
}
}
$loaded[$helper] =& new $helperCn($options);
$vars = array(
'base', 'webroot', 'here', 'params', 'action', 'data', 'themeWeb', 'plugin'
);
$c = count($vars);

for ($j = 0; $j < $c; $j++) {
$loaded[$helper]->{$vars[$j]} = $this->{$vars[$j]};
}

if (!empty($this->validationErrors)) {
$loaded[$helper]->validationErrors = $this->validationErrors;
}
if (is_array($loaded[$helper]->helpers) && !empty($loaded[$helper]->helpers)) {
$loaded =& $this->_loadHelpers($loaded, $loaded[$helper]->helpers, $helper);
}
}
if (isset($loaded[$parent])) {
$loaded[$parent]->{$helper} =& $loaded[$helper];
}
}
return $loaded;
}

/**
* Returns filename of given action's template file (.ctp) as a string.
* CamelCased action names will be under_scored! This means that you can have
* LongActionNames that refer to long_action_names.ctp views.
*
* @param string $action Controller action to find template filename for
* @return string Template filename
* @access protected
*/
function _getViewFileName($name = null) {
$subDir = null;

if (!is_null($this->subDir)) {
$subDir = $this->subDir . DS;
}

if ($name === null) {
$name = $this->action;
}
$name = str_replace('/', DS, $name);

if (strpos($name, DS) === false && $name[0] !== '.') {
$name = $this->viewPath . DS . $subDir . Inflector::underscore($name);
} elseif (strpos($name, DS) !== false) {
if ($name{0} === DS || $name{1} === ':') {
if (is_file($name)) {
return $name;
}
$name = trim($name, DS);
} else if ($name[0] === '.') {
$name = substr($name, 3);
} else {
$name = $this->viewPath . DS . $subDir . $name;
}
}

$paths = $this->_paths(Inflector::underscore($this->plugin));

$exts = array($this->ext);
if ($this->ext !== '.ctp') {
array_push($exts, '.ctp');
}
foreach ($exts as $ext) {
foreach ($paths as $path) {
if (file_exists($path . $name . $ext)) {
return $path . $name . $ext;
}
}
}
$defaultPath = $paths[0];

if ($this->plugin) {
$pluginPaths = App::path('plugins');
foreach ($paths as $path) {
if (strpos($path, $pluginPaths[0]) === 0) {
$defaultPath = $path;
break;
}
}
}
return $this->_missingView($defaultPath . $name . $this->ext, 'missingView');
}

/**
* Returns layout filename for this template as a string.
*
* @return string Filename for layout file (.ctp).
* @access protected
*/
function _getLayoutFileName($name = null) {
if ($name === null) {
$name = $this->layout;
}
$subDir = null;

if (!is_null($this->layoutPath)) {
$subDir = $this->layoutPath . DS;
}
$paths = $this->_paths(Inflector::underscore($this->plugin));
$file = 'layouts' . DS . $subDir . $name;

$exts = array($this->ext);
if ($this->ext !== '.ctp') {
array_push($exts, '.ctp');
}
foreach ($exts as $ext) {
foreach ($paths as $path) {
if (file_exists($path . $file . $ext)) {
return $path . $file . $ext;
}
}
}
return $this->_missingView($paths[0] . $file . $this->ext, 'missingLayout');
}

/**
* Return a misssing view error message
*
* @param string $viewFileName the filename that should exist
* @return cakeError
*/
function _missingView($file, $error = 'missingView') {

if ($error === 'missingView') {
$this->cakeError('missingView', array(
'className' => $this->name,
'action' => $this->action,
'file' => $file,
'base' => $this->base
));
return false;
} elseif ($error === 'missingLayout') {
$this->cakeError('missingLayout', array(
'layout' => $this->layout,
'file' => $file,
'base' => $this->base
));
return false;
}
}

/**
* Return all possible paths to find view files in order
*
* @param string $plugin
* @return array paths
* @access protected
*/
function _paths($plugin = null, $cached = true) {
if ($plugin === null && $cached === true && !empty($this->__paths)) {
return $this->__paths;
}
$paths = array();
$viewPaths = App::path('views');
$corePaths = array_flip(App::core('views'));

if (!empty($plugin)) {
$count = count($viewPaths);
for ($i = 0; $i < $count; $i++) {
if (!isset($corePaths[$viewPaths[$i]])) {
$paths[] = $viewPaths[$i] . 'plugins' . DS . $plugin . DS;
}
}
$pluginPaths = App::path('plugins');
$count = count($pluginPaths);

for ($i = 0; $i < $count; $i++) {
$paths[] = $pluginPaths[$i] . $plugin . DS . 'views' . DS;
}
}
$paths = array_merge($paths, $viewPaths);

if (empty($this->__paths)) {
$this->__paths = $paths;
}
return $paths;
}
}

?>
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