cakephp2-php8/cake/libs/view/view.php
mark_story 44c080d5ad Making all core classes throw CakeException subclasses, this allows developers to catch framework exceptions with one catch.
Adding package specific exceptions.
Replacing generic exceptions in the codebase with CakeException + package exceptions.
2010-12-11 19:26:10 -05:00

820 lines
20 KiB
PHP

<?php
/**
* Methods for displaying presentation data in the view.
*
* PHP 5
*
* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
* Copyright 2005-2010, Cake Software Foundation, Inc. (http://cakefoundation.org)
*
* Licensed under The MIT License
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright 2005-2010, Cake Software Foundation, Inc. (http://cakefoundation.org)
* @link http://cakephp.org CakePHP(tm) Project
* @package cake
* @subpackage cake.cake.libs.view
* @since CakePHP(tm) v 0.10.0.1076
* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
*/
/**
* Included libraries.
*/
App::import('View', 'HelperCollection', false);
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 {
/**
* Helpers collection
*
* @var HelperCollection
*/
public $Helpers;
/**
* Name of the plugin.
*
* @link http://manual.cakephp.org/chapter/plugins
* @var string
*/
public $plugin = null;
/**
* Name of the controller.
*
* @var string Name of controller
* @access public
*/
public $name = null;
/**
* Current passed params
*
* @var mixed
*/
public $passedArgs = 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
*/
public $helpers = array('Html');
/**
* Path to View.
*
* @var string Path to View
*/
public $viewPath = null;
/**
* Variables for the view
*
* @var array
* @access public
*/
public $viewVars = array();
/**
* Name of layout to use with this View.
*
* @var string
* @access public
*/
public $layout = 'default';
/**
* Path to Layout.
*
* @var string Path to Layout
*/
public $layoutPath = null;
/**
* Turns on or off Cake's conventional mode of rendering views. On by default.
*
* @var boolean
* @access public
*/
public $autoRender = true;
/**
* Turns on or off Cake's conventional mode of finding layout files. On by default.
*
* @var boolean
* @access public
*/
public $autoLayout = true;
/**
* File extension. Defaults to Cake's template ".ctp".
*
* @var string
* @access public
*/
public $ext = '.ctp';
/**
* Sub-directory for this view file.
*
* @var string
* @access public
*/
public $subDir = null;
/**
* Theme name.
*
* @var string
* @access public
*/
public $theme = null;
/**
* Used to define methods a controller that will be cached.
*
* @see Controller::$cacheAction
* @var mixed
* @access public
*/
public $cacheAction = false;
/**
* holds current errors for the model validation
*
* @var array
* @access public
*/
public $validationErrors = array();
/**
* True when the view has been rendered.
*
* @var boolean
* @access public
*/
public $hasRendered = false;
/**
* True if in scope of model-specific region
*
* @var boolean
* @access public
*/
public $modelScope = false;
/**
* Name of current model this view context is attached to
*
* @var string
* @access public
*/
public $model = null;
/**
* Name of association model this view context is attached to
*
* @var string
* @access public
*/
public $association = null;
/**
* Name of current model field this view context is attached to
*
* @var string
* @access public
*/
public $field = null;
/**
* Suffix of current field this view context is attached to
*
* @var string
* @access public
*/
public $fieldSuffix = null;
/**
* The current model ID this view context is attached to
*
* @var mixed
* @access public
*/
public $modelId = null;
/**
* List of generated DOM UUIDs
*
* @var array
* @access public
*/
public $uuids = array();
/**
* Holds View output.
*
* @var string
* @access public
*/
public $output = false;
/**
* An instance of a CakeRequest object that contains information about the current request.
* This object contains all the information about a request and several methods for reading
* additional information about the request.
*
* @var CakeRequest
*/
public $request;
/**
* The Cache configuration View will use to store cached elements. Changing this will change
* the default configuration elements are stored under. You can also choose a cache config
* per element.
*
* @var string
* @see View::element()
*/
public $elementCache = 'default';
/**
* List of variables to collect from the associated controller
*
* @var array
* @access protected
*/
private $__passedVars = array(
'viewVars', 'autoLayout', 'autoRender', 'ext', 'helpers', 'layout', 'name',
'layoutPath', 'viewPath', 'request', 'plugin', 'passedArgs', 'cacheAction'
);
/**
* Scripts (and/or other <head /> tags) for the layout
*
* @var array
* @access protected
*/
protected $_scripts = array();
/**
* Holds an array of paths.
*
* @var array
* @access private
*/
private $__paths = array();
/**
* boolean to indicate that helpers have been loaded.
*
* @var boolean
*/
protected $_helpersLoaded = false;
/**
* Constructor
*
* @param Controller $controller A controller object to pull View::__passedArgs from.
*/
function __construct($controller) {
if (is_object($controller)) {
$count = count($this->__passedVars);
for ($j = 0; $j < $count; $j++) {
$var = $this->__passedVars[$j];
$this->{$var} = $controller->{$var};
}
}
$this->Helpers = new HelperCollection($this);
parent::__construct();
}
/**
* 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 $params array is used to send data to be used in the
* Element. Elements can be cached through use of the cache key.
*
* ### Special params
*
* - `cache` - Can either be `true`, to enable caching using the config in View::$elementCache. Or an array
* If an array, the following keys can be used:
* - `config` - Used to store the cached element in a custom cache configuration.
* - `key` - Used to define the key used in the Cache::write(). It will be prefixed with `element_`
* - `plugin` - Load an element from a specific plugin.
*
* @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)
* @param boolean $callbacks Set to true to fire beforeRender and afterRender helper callbacks for this element.
* Defaults to false.
* @return string Rendered Element
*/
public function element($name, $params = array(), $callbacks = false) {
$file = $plugin = $key = null;
if (isset($params['plugin'])) {
$plugin = $params['plugin'];
}
if (isset($this->plugin) && !$plugin) {
$plugin = $this->plugin;
}
if (isset($params['cache'])) {
$keys = array_merge(array($plugin, $name), array_keys($params));
$caching = array(
'config' => $this->elementCache,
'key' => implode('_', $keys)
);
if (is_array($params['cache'])) {
$defaults = array(
'config' => $this->elementCache,
'key' => $caching['key']
);
$caching = array_merge($defaults, $params['cache']);
}
$key = 'element_' . $caching['key'];
$contents = Cache::read($key, $caching['config']);
if ($contents !== false) {
return $contents;
}
}
$file = $this->_getElementFilename($name, $plugin);
if ($file) {
if (!$this->_helpersLoaded) {
$this->loadHelpers();
}
if ($callbacks) {
$this->Helpers->trigger('beforeRender', array($file));
}
$element = $this->_render($file, array_merge($this->viewVars, $params));
if ($callbacks) {
$this->Helpers->trigger('afterRender', array($file, $element));
}
if (isset($params['cache'])) {
Cache::write($key, $element, $caching['config']);
}
return $element;
}
$file = 'elements' . DS . $name . $this->ext;
if (Configure::read('debug') > 0) {
return "Element 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 $file Custom filename for view
* @return string Rendered Element
* @throws CakeException if there is an error in the view.
*/
public function render($action = null, $layout = null, $file = null) {
if ($this->hasRendered) {
return true;
}
if (!$this->_helpersLoaded) {
$this->loadHelpers();
}
$this->output = null;
if ($file != null) {
$action = $file;
}
if ($action !== false && $viewFileName = $this->_getViewFileName($action)) {
$this->Helpers->trigger('beforeRender', array($viewFileName));
$this->output = $this->_render($viewFileName);
$this->Helpers->trigger('afterRender', array($viewFileName));
}
if ($layout === null) {
$layout = $this->layout;
}
if ($this->output === false) {
throw new CakeException(__("Error in view %s, got no content.", $viewFileName));
}
if ($layout && $this->autoLayout) {
$this->output = $this->renderLayout($this->output, $layout);
}
$this->hasRendered = true;
return $this->output;
}
/**
* Renders a layout. Returns output from _render(). Returns false on error.
* Several variables are created for use in layout.
*
* - `title_for_layout` - A backwards compatible place holder, you should set this value if you want more control.
* - `content_for_layout` - contains rendered view file
* - `scripts_for_layout` - contains scripts added to header
*
* @param string $content_for_layout Content to render in a view, wrapped by the surrounding layout.
* @return mixed Rendered output, or false on error
* @throws CakeException if there is an error in the view.
*/
public function renderLayout($content_for_layout, $layout = null) {
$layoutFileName = $this->_getLayoutFileName($layout);
if (empty($layoutFileName)) {
return $this->output;
}
if (!$this->_helpersLoaded) {
$this->loadHelpers();
}
$this->Helpers->trigger('beforeLayout', array($layoutFileName));
$this->viewVars = array_merge($this->viewVars, array(
'content_for_layout' => $content_for_layout,
'scripts_for_layout' => implode("\n\t", $this->_scripts),
));
if (!isset($this->viewVars['title_for_layout'])) {
$this->viewVars['title_for_layout'] = Inflector::humanize($this->viewPath);
}
$this->output = $this->_render($layoutFileName);
if ($this->output === false) {
throw new CakeException(__("Error in layout %s, got no content.", $layoutFileName));
}
$this->Helpers->trigger('afterLayout', array($layoutFileName));
return $this->output;
}
/**
* Render cached view. Works in concert with CacheHelper and Dispatcher to
* render cached view files.
*
* @param string $filename the cache file to include
* @param string $timeStart the page render start time
* @return boolean Success of rendering the cached file.
*/
public function renderCache($filename, $timeStart) {
ob_start();
include ($filename);
if (Configure::read('debug') > 0 && $this->layout != 'xml') {
echo "<!-- Cached Render Time: " . round(microtime(true) - $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, $commentLength);
return true;
}
}
}
/**
* Returns a list of variables available in the current View context
*
* @return array Array of the set view variable names.
*/
public function getVars() {
return array_keys($this->viewVars);
}
/**
* Returns the contents of the given View variable(s)
*
* @param string $var The view var you want the contents of.
* @return mixed The content of the named var if its set, otherwise null.
*/
public function getVar($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 Either the key name for the script, or the script content. Name can be used to
* update/replace a script element.
* @param string $content The content of the script being added, optional.
* @return void
*/
public function addScript($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 $url The object's target URL
* @return string
*/
public function uuid($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
*/
public function entity() {
$assoc = ($this->association) ? $this->association : $this->model;
if (!empty($this->entityPath)) {
$path = explode('.', $this->entityPath);
$count = count($path);
if (
($count == 1 && !empty($this->association)) ||
($count == 1 && $this->model != $this->entityPath) ||
($count == 1 && empty($this->association) && !empty($this->field)) ||
($count == 2 && !empty($this->fieldSuffix)) ||
is_numeric($path[0]) && !empty($assoc)
) {
array_unshift($path, $assoc);
}
return Set::filter($path);
}
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 $one's keys.
* @return void
*/
public function set($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 = $data + $this->viewVars;
}
/**
* Magic accessor for helpers. Provides access to attributes that were deprecated.
*
* @param string $name Name of the attribute to get.
* @return mixed
*/
public function __get($name) {
if (isset($this->Helpers->{$name})) {
return $this->Helpers->{$name};
}
switch ($name) {
case 'base':
case 'here':
case 'webroot':
case 'data':
return $this->request->{$name};
case 'action':
return isset($this->request->params['action']) ? $this->request->params['action'] : '';
case 'params':
return $this->request;
}
return null;
}
/**
* Interact with the HelperCollection to load all the helpers.
*
* @return void
*/
public function loadHelpers() {
$helpers = HelperCollection::normalizeObjectArray($this->helpers);
foreach ($helpers as $name => $properties) {
$this->Helpers->load($properties['class'], $properties['settings'], true);
}
$this->_helpersLoaded = true;
}
/**
* 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
* @param boolean $loadHelpers Boolean to indicate that helpers should be loaded.
* @param boolean $cached Whether or not to trigger the creation of a cache file.
* @return string Rendered output
*/
protected function _render($___viewFn, $___dataForView = array(), $loadHelpers = true, $cached = false) {
if (empty($___dataForView)) {
$___dataForView = $this->viewVars;
}
extract($___dataForView, EXTR_SKIP);
ob_start();
include $___viewFn;
return ob_get_clean();
}
/**
* Loads a helper. Delegates to the `HelperCollection::load()` to load the helper
*
* @param string $helperName Name of the helper to load.
* @param array $settings Settings for the helper
* @return Helper a constructed helper object.
* @see HelperCollection::load()
*/
public function loadHelper($helperName, $settings = array()) {
return $this->Helpers->load($helperName, $settings);
}
/**
* 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 $name Controller action to find template filename for
* @return string Template filename
* @throws MissingViewException when a view file could not be found.
*/
protected function _getViewFileName($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 = $this->_paths($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;
}
}
}
throw new MissingViewException(array('file' => $defaultPath . $name . $this->ext));
}
/**
* Returns layout filename for this template as a string.
*
* @param string $name The name of the layout to find.
* @return string Filename for layout file (.ctp).
* @throws MissingLayoutException when a layout cannot be located
*/
protected function _getLayoutFileName($name = null) {
if ($name === null) {
$name = $this->layout;
}
$subDir = null;
if (!is_null($this->layoutPath)) {
$subDir = $this->layoutPath . DS;
}
$paths = $this->_paths($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;
}
}
}
throw new MissingLayoutException(array('file' => $paths[0] . $file . $this->ext));
}
/**
* Finds an element filename, returns false on failure.
*
* @param string $name The name of the element to find.
* @param string $plugin The plugin name the element is in.
* @return mixed Either a string to the element filename or false when one can't be found.
*/
protected function _getElementFileName($name, $plugin = null) {
$paths = $this->_paths($plugin);
foreach ($paths as $path) {
if (file_exists($path . 'elements' . DS . $name . $this->ext)) {
return $path . 'elements' . DS . $name . $this->ext;
}
}
return false;
}
/**
* Return all possible paths to find view files in order
*
* @param string $plugin Optional plugin name to scan for view files.
* @param boolean $cached Set to true to force a refresh of view paths.
* @return array paths
*/
protected function _paths($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;
}
}
$paths[] = App::pluginPath($plugin) . 'views' . DS;
}
$this->__paths = array_merge($paths, $viewPaths);
return $this->__paths;
}
}