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   1: <?php
   2: /**
   3:  * Methods for displaying presentation data in the view.
   4:  *
   5:  * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
   6:  * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
   7:  *
   8:  * Licensed under The MIT License
   9:  * For full copyright and license information, please see the LICENSE.txt
  10:  * Redistributions of files must retain the above copyright notice.
  11:  *
  12:  * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
  13:  * @link          http://cakephp.org CakePHP(tm) Project
  14:  * @package       Cake.View
  15:  * @since         CakePHP(tm) v 0.10.0.1076
  16:  * @license       http://www.opensource.org/licenses/mit-license.php MIT License
  17:  */
  18: 
  19: App::uses('HelperCollection', 'View');
  20: App::uses('AppHelper', 'View/Helper');
  21: App::uses('Router', 'Routing');
  22: App::uses('ViewBlock', 'View');
  23: App::uses('CakeEvent', 'Event');
  24: App::uses('CakeEventManager', 'Event');
  25: App::uses('CakeResponse', 'Network');
  26: 
  27: /**
  28:  * View, the V in the MVC triad. View interacts with Helpers and view variables passed
  29:  * in from the controller to render the results of the controller action. Often this is HTML,
  30:  * but can also take the form of JSON, XML, PDF's or streaming files.
  31:  *
  32:  * CakePHP uses a two-step-view pattern. This means that the view content is rendered first,
  33:  * and then inserted into the selected layout. This also means you can pass data from the view to the
  34:  * layout using `$this->set()`
  35:  *
  36:  * Since 2.1, the base View class also includes support for themes by default. Theme views are regular
  37:  * view files that can provide unique HTML and static assets. If theme views are not found for the
  38:  * current view the default app view files will be used. You can set `$this->theme = 'mytheme'`
  39:  * in your Controller to use the Themes.
  40:  *
  41:  * Example of theme path with `$this->theme = 'SuperHot';` Would be `app/View/Themed/SuperHot/Posts`
  42:  *
  43:  * @package       Cake.View
  44:  * @property      CacheHelper $Cache
  45:  * @property      FormHelper $Form
  46:  * @property      HtmlHelper $Html
  47:  * @property      JsHelper $Js
  48:  * @property      NumberHelper $Number
  49:  * @property      PaginatorHelper $Paginator
  50:  * @property      RssHelper $Rss
  51:  * @property      SessionHelper $Session
  52:  * @property      TextHelper $Text
  53:  * @property      TimeHelper $Time
  54:  * @property      ViewBlock $Blocks
  55:  */
  56: class View extends Object {
  57: 
  58: /**
  59:  * Helpers collection
  60:  *
  61:  * @var HelperCollection
  62:  */
  63:     public $Helpers;
  64: 
  65: /**
  66:  * ViewBlock instance.
  67:  *
  68:  * @var ViewBlock
  69:  */
  70:     public $Blocks;
  71: 
  72: /**
  73:  * Name of the plugin.
  74:  *
  75:  * @link http://manual.cakephp.org/chapter/plugins
  76:  * @var string
  77:  */
  78:     public $plugin = null;
  79: 
  80: /**
  81:  * Name of the controller.
  82:  *
  83:  * @var string
  84:  */
  85:     public $name = null;
  86: 
  87: /**
  88:  * Current passed params
  89:  *
  90:  * @var mixed
  91:  */
  92:     public $passedArgs = array();
  93: 
  94: /**
  95:  * An array of names of built-in helpers to include.
  96:  *
  97:  * @var mixed
  98:  */
  99:     public $helpers = array();
 100: 
 101: /**
 102:  * Path to View.
 103:  *
 104:  * @var string
 105:  */
 106:     public $viewPath = null;
 107: 
 108: /**
 109:  * Variables for the view
 110:  *
 111:  * @var array
 112:  */
 113:     public $viewVars = array();
 114: 
 115: /**
 116:  * Name of view to use with this View.
 117:  *
 118:  * @var string
 119:  */
 120:     public $view = null;
 121: 
 122: /**
 123:  * Name of layout to use with this View.
 124:  *
 125:  * @var string
 126:  */
 127:     public $layout = 'default';
 128: 
 129: /**
 130:  * Path to Layout.
 131:  *
 132:  * @var string
 133:  */
 134:     public $layoutPath = null;
 135: 
 136: /**
 137:  * Turns on or off CakePHP's conventional mode of applying layout files. On by default.
 138:  * Setting to off means that layouts will not be automatically applied to rendered views.
 139:  *
 140:  * @var bool
 141:  */
 142:     public $autoLayout = true;
 143: 
 144: /**
 145:  * File extension. Defaults to CakePHP's template ".ctp".
 146:  *
 147:  * @var string
 148:  */
 149:     public $ext = '.ctp';
 150: 
 151: /**
 152:  * Sub-directory for this view file. This is often used for extension based routing.
 153:  * Eg. With an `xml` extension, $subDir would be `xml/`
 154:  *
 155:  * @var string
 156:  */
 157:     public $subDir = null;
 158: 
 159: /**
 160:  * Theme name.
 161:  *
 162:  * @var string
 163:  */
 164:     public $theme = null;
 165: 
 166: /**
 167:  * Used to define methods a controller that will be cached.
 168:  *
 169:  * @see Controller::$cacheAction
 170:  * @var mixed
 171:  */
 172:     public $cacheAction = false;
 173: 
 174: /**
 175:  * Holds current errors for the model validation.
 176:  *
 177:  * @var array
 178:  */
 179:     public $validationErrors = array();
 180: 
 181: /**
 182:  * True when the view has been rendered.
 183:  *
 184:  * @var bool
 185:  */
 186:     public $hasRendered = false;
 187: 
 188: /**
 189:  * List of generated DOM UUIDs.
 190:  *
 191:  * @var array
 192:  */
 193:     public $uuids = array();
 194: 
 195: /**
 196:  * An instance of a CakeRequest object that contains information about the current request.
 197:  * This object contains all the information about a request and several methods for reading
 198:  * additional information about the request.
 199:  *
 200:  * @var CakeRequest
 201:  */
 202:     public $request;
 203: 
 204: /**
 205:  * Reference to the Response object
 206:  *
 207:  * @var CakeResponse
 208:  */
 209:     public $response;
 210: 
 211: /**
 212:  * The Cache configuration View will use to store cached elements. Changing this will change
 213:  * the default configuration elements are stored under. You can also choose a cache config
 214:  * per element.
 215:  *
 216:  * @var string
 217:  * @see View::element()
 218:  */
 219:     public $elementCache = 'default';
 220: 
 221: /**
 222:  * Element cache settings
 223:  *
 224:  * @var array
 225:  * @see View::_elementCache();
 226:  * @see View::_renderElement
 227:  */
 228:     public $elementCacheSettings = array();
 229: 
 230: /**
 231:  * List of variables to collect from the associated controller.
 232:  *
 233:  * @var array
 234:  */
 235:     protected $_passedVars = array(
 236:         'viewVars', 'autoLayout', 'ext', 'helpers', 'view', 'layout', 'name', 'theme',
 237:         'layoutPath', 'viewPath', 'request', 'plugin', 'passedArgs', 'cacheAction'
 238:     );
 239: 
 240: /**
 241:  * Scripts (and/or other <head /> tags) for the layout.
 242:  *
 243:  * @var array
 244:  */
 245:     protected $_scripts = array();
 246: 
 247: /**
 248:  * Holds an array of paths.
 249:  *
 250:  * @var array
 251:  */
 252:     protected $_paths = array();
 253: 
 254: /**
 255:  * Holds an array of plugin paths.
 256:  *
 257:  * @var array
 258:  */
 259:     protected $_pathsForPlugin = array();
 260: 
 261: /**
 262:  * The names of views and their parents used with View::extend();
 263:  *
 264:  * @var array
 265:  */
 266:     protected $_parents = array();
 267: 
 268: /**
 269:  * The currently rendering view file. Used for resolving parent files.
 270:  *
 271:  * @var string
 272:  */
 273:     protected $_current = null;
 274: 
 275: /**
 276:  * Currently rendering an element. Used for finding parent fragments
 277:  * for elements.
 278:  *
 279:  * @var string
 280:  */
 281:     protected $_currentType = '';
 282: 
 283: /**
 284:  * Content stack, used for nested templates that all use View::extend();
 285:  *
 286:  * @var array
 287:  */
 288:     protected $_stack = array();
 289: 
 290: /**
 291:  * Instance of the CakeEventManager this View object is using
 292:  * to dispatch inner events. Usually the manager is shared with
 293:  * the controller, so it it possible to register view events in
 294:  * the controller layer.
 295:  *
 296:  * @var CakeEventManager
 297:  */
 298:     protected $_eventManager = null;
 299: 
 300: /**
 301:  * Whether the event manager was already configured for this object
 302:  *
 303:  * @var bool
 304:  */
 305:     protected $_eventManagerConfigured = false;
 306: 
 307: /**
 308:  * Constant for view file type 'view'
 309:  *
 310:  * @var string
 311:  */
 312:     const TYPE_VIEW = 'view';
 313: 
 314: /**
 315:  * Constant for view file type 'element'
 316:  *
 317:  * @var string
 318:  */
 319:     const TYPE_ELEMENT = 'element';
 320: 
 321: /**
 322:  * Constant for view file type 'layout'
 323:  *
 324:  * @var string
 325:  */
 326:     const TYPE_LAYOUT = 'layout';
 327: 
 328: /**
 329:  * Constructor
 330:  *
 331:  * @param Controller $controller A controller object to pull View::_passedVars from.
 332:  */
 333:     public function __construct(Controller $controller = null) {
 334:         if (is_object($controller)) {
 335:             $count = count($this->_passedVars);
 336:             for ($j = 0; $j < $count; $j++) {
 337:                 $var = $this->_passedVars[$j];
 338:                 $this->{$var} = $controller->{$var};
 339:             }
 340:             $this->_eventManager = $controller->getEventManager();
 341:         }
 342:         if (empty($this->request) && !($this->request = Router::getRequest(true))) {
 343:             $this->request = new CakeRequest(null, false);
 344:             $this->request->base = '';
 345:             $this->request->here = $this->request->webroot = '/';
 346:         }
 347:         if (is_object($controller) && isset($controller->response)) {
 348:             $this->response = $controller->response;
 349:         } else {
 350:             $this->response = new CakeResponse();
 351:         }
 352:         $this->Helpers = new HelperCollection($this);
 353:         $this->Blocks = new ViewBlock();
 354:         $this->loadHelpers();
 355:         parent::__construct();
 356:     }
 357: 
 358: /**
 359:  * Returns the CakeEventManager manager instance that is handling any callbacks.
 360:  * You can use this instance to register any new listeners or callbacks to the
 361:  * controller events, or create your own events and trigger them at will.
 362:  *
 363:  * @return CakeEventManager
 364:  */
 365:     public function getEventManager() {
 366:         if (empty($this->_eventManager)) {
 367:             $this->_eventManager = new CakeEventManager();
 368:         }
 369:         if (!$this->_eventManagerConfigured) {
 370:             $this->_eventManager->attach($this->Helpers);
 371:             $this->_eventManagerConfigured = true;
 372:         }
 373:         return $this->_eventManager;
 374:     }
 375: 
 376: /**
 377:  * Renders a piece of PHP with provided parameters and returns HTML, XML, or any other string.
 378:  *
 379:  * This realizes the concept of Elements, (or "partial layouts") and the $params array is used to send
 380:  * data to be used in the element. Elements can be cached improving performance by using the `cache` option.
 381:  *
 382:  * @param string $name Name of template file in the/app/View/Elements/ folder,
 383:  *   or `MyPlugin.template` to use the template element from MyPlugin. If the element
 384:  *   is not found in the plugin, the normal view path cascade will be searched.
 385:  * @param array $data Array of data to be made available to the rendered view (i.e. the Element)
 386:  * @param array $options Array of options. Possible keys are:
 387:  * - `cache` - Can either be `true`, to enable caching using the config in View::$elementCache. Or an array
 388:  *   If an array, the following keys can be used:
 389:  *   - `config` - Used to store the cached element in a custom cache configuration.
 390:  *   - `key` - Used to define the key used in the Cache::write(). It will be prefixed with `element_`
 391:  * - `plugin` - (deprecated!) Load an element from a specific plugin. This option is deprecated, and
 392:  *              will be removed in CakePHP 3.0. Use `Plugin.element_name` instead.
 393:  * - `callbacks` - Set to true to fire beforeRender and afterRender helper callbacks for this element.
 394:  *   Defaults to false.
 395:  * - `ignoreMissing` - Used to allow missing elements. Set to true to not trigger notices.
 396:  * @return string Rendered Element
 397:  */
 398:     public function element($name, $data = array(), $options = array()) {
 399:         $file = $plugin = null;
 400: 
 401:         if (isset($options['plugin'])) {
 402:             $name = Inflector::camelize($options['plugin']) . '.' . $name;
 403:         }
 404: 
 405:         if (!isset($options['callbacks'])) {
 406:             $options['callbacks'] = false;
 407:         }
 408: 
 409:         if (isset($options['cache'])) {
 410:             $contents = $this->_elementCache($name, $data, $options);
 411:             if ($contents !== false) {
 412:                 return $contents;
 413:             }
 414:         }
 415: 
 416:         $file = $this->_getElementFilename($name);
 417:         if ($file) {
 418:             return $this->_renderElement($file, $data, $options);
 419:         }
 420: 
 421:         if (empty($options['ignoreMissing'])) {
 422:             list ($plugin, $name) = pluginSplit($name, true);
 423:             $name = str_replace('/', DS, $name);
 424:             $file = $plugin . 'Elements' . DS . $name . $this->ext;
 425:             trigger_error(__d('cake_dev', 'Element Not Found: %s', $file), E_USER_NOTICE);
 426:         }
 427:     }
 428: 
 429: /**
 430:  * Checks if an element exists
 431:  *
 432:  * @param string $name Name of template file in the /app/View/Elements/ folder,
 433:  *   or `MyPlugin.template` to check the template element from MyPlugin. If the element
 434:  *   is not found in the plugin, the normal view path cascade will be searched.
 435:  * @return bool Success
 436:  */
 437:     public function elementExists($name) {
 438:         return (bool)$this->_getElementFilename($name);
 439:     }
 440: 
 441: /**
 442:  * Renders view for given view file and layout.
 443:  *
 444:  * Render triggers helper callbacks, which are fired before and after the view are rendered,
 445:  * as well as before and after the layout. The helper callbacks are called:
 446:  *
 447:  * - `beforeRender`
 448:  * - `afterRender`
 449:  * - `beforeLayout`
 450:  * - `afterLayout`
 451:  *
 452:  * If View::$autoRender is false and no `$layout` is provided, the view will be returned bare.
 453:  *
 454:  * View and layout names can point to plugin views/layouts. Using the `Plugin.view` syntax
 455:  * a plugin view/layout can be used instead of the app ones. If the chosen plugin is not found
 456:  * the view will be located along the regular view path cascade.
 457:  *
 458:  * @param string $view Name of view file to use
 459:  * @param string $layout Layout to use.
 460:  * @return string|null Rendered content or null if content already rendered and returned earlier.
 461:  * @triggers View.beforeRender $this, array($viewFileName)
 462:  * @triggers View.afterRender $this, array($viewFileName)
 463:  * @throws CakeException If there is an error in the view.
 464:  */
 465:     public function render($view = null, $layout = null) {
 466:         if ($this->hasRendered) {
 467:             return;
 468:         }
 469: 
 470:         if ($view !== false && $viewFileName = $this->_getViewFileName($view)) {
 471:             $this->_currentType = self::TYPE_VIEW;
 472:             $this->getEventManager()->dispatch(new CakeEvent('View.beforeRender', $this, array($viewFileName)));
 473:             $this->Blocks->set('content', $this->_render($viewFileName));
 474:             $this->getEventManager()->dispatch(new CakeEvent('View.afterRender', $this, array($viewFileName)));
 475:         }
 476: 
 477:         if ($layout === null) {
 478:             $layout = $this->layout;
 479:         }
 480:         if ($layout && $this->autoLayout) {
 481:             $this->Blocks->set('content', $this->renderLayout('', $layout));
 482:         }
 483:         $this->hasRendered = true;
 484:         return $this->Blocks->get('content');
 485:     }
 486: 
 487: /**
 488:  * Renders a layout. Returns output from _render(). Returns false on error.
 489:  * Several variables are created for use in layout.
 490:  *
 491:  * - `title_for_layout` - A backwards compatible place holder, you should set this value if you want more control.
 492:  * - `content_for_layout` - contains rendered view file
 493:  * - `scripts_for_layout` - Contains content added with addScript() as well as any content in
 494:  *   the 'meta', 'css', and 'script' blocks. They are appended in that order.
 495:  *
 496:  * Deprecated features:
 497:  *
 498:  * - `$scripts_for_layout` is deprecated and will be removed in CakePHP 3.0.
 499:  *   Use the block features instead. `meta`, `css` and `script` will be populated
 500:  *   by the matching methods on HtmlHelper.
 501:  * - `$title_for_layout` is deprecated and will be removed in CakePHP 3.0.
 502:  *   Use the `title` block instead.
 503:  * - `$content_for_layout` is deprecated and will be removed in CakePHP 3.0.
 504:  *   Use the `content` block instead.
 505:  *
 506:  * @param string $content Content to render in a view, wrapped by the surrounding layout.
 507:  * @param string $layout Layout name
 508:  * @return mixed Rendered output, or false on error
 509:  * @triggers View.beforeLayout $this, array($layoutFileName)
 510:  * @triggers View.afterLayout $this, array($layoutFileName)
 511:  * @throws CakeException if there is an error in the view.
 512:  */
 513:     public function renderLayout($content, $layout = null) {
 514:         $layoutFileName = $this->_getLayoutFileName($layout);
 515:         if (empty($layoutFileName)) {
 516:             return $this->Blocks->get('content');
 517:         }
 518: 
 519:         if (empty($content)) {
 520:             $content = $this->Blocks->get('content');
 521:         } else {
 522:             $this->Blocks->set('content', $content);
 523:         }
 524:         $this->getEventManager()->dispatch(new CakeEvent('View.beforeLayout', $this, array($layoutFileName)));
 525: 
 526:         $scripts = implode("\n\t", $this->_scripts);
 527:         $scripts .= $this->Blocks->get('meta') . $this->Blocks->get('css') . $this->Blocks->get('script');
 528: 
 529:         $this->viewVars = array_merge($this->viewVars, array(
 530:             'content_for_layout' => $content,
 531:             'scripts_for_layout' => $scripts,
 532:         ));
 533: 
 534:         $title = $this->Blocks->get('title');
 535:         if ($title === '') {
 536:             if (isset($this->viewVars['title_for_layout'])) {
 537:                 $title = $this->viewVars['title_for_layout'];
 538:             } else {
 539:                 $title = Inflector::humanize($this->viewPath);
 540:             }
 541:         }
 542:         $this->viewVars['title_for_layout'] = $title;
 543:         $this->Blocks->set('title', $title);
 544: 
 545:         $this->_currentType = self::TYPE_LAYOUT;
 546:         $this->Blocks->set('content', $this->_render($layoutFileName));
 547: 
 548:         $this->getEventManager()->dispatch(new CakeEvent('View.afterLayout', $this, array($layoutFileName)));
 549:         return $this->Blocks->get('content');
 550:     }
 551: 
 552: /**
 553:  * Render cached view. Works in concert with CacheHelper and Dispatcher to
 554:  * render cached view files.
 555:  *
 556:  * @param string $filename the cache file to include
 557:  * @param string $timeStart the page render start time
 558:  * @return bool Success of rendering the cached file.
 559:  */
 560:     public function renderCache($filename, $timeStart) {
 561:         $response = $this->response;
 562:         ob_start();
 563:         include $filename;
 564: 
 565:         $type = $response->mapType($response->type());
 566:         if (Configure::read('debug') > 0 && $type === 'html') {
 567:             echo "<!-- Cached Render Time: " . round(microtime(true) - $timeStart, 4) . "s -->";
 568:         }
 569:         $out = ob_get_clean();
 570: 
 571:         if (preg_match('/^<!--cachetime:(\\d+)-->/', $out, $match)) {
 572:             if (time() >= $match['1']) {
 573:                 //@codingStandardsIgnoreStart
 574:                 @unlink($filename);
 575:                 //@codingStandardsIgnoreEnd
 576:                 unset($out);
 577:                 return false;
 578:             }
 579:             return substr($out, strlen($match[0]));
 580:         }
 581:     }
 582: 
 583: /**
 584:  * Returns a list of variables available in the current View context
 585:  *
 586:  * @return array Array of the set view variable names.
 587:  */
 588:     public function getVars() {
 589:         return array_keys($this->viewVars);
 590:     }
 591: 
 592: /**
 593:  * Returns the contents of the given View variable(s)
 594:  *
 595:  * @param string $var The view var you want the contents of.
 596:  * @return mixed The content of the named var if its set, otherwise null.
 597:  * @deprecated 3.0.0 Will be removed in 3.0. Use View::get() instead.
 598:  */
 599:     public function getVar($var) {
 600:         return $this->get($var);
 601:     }
 602: 
 603: /**
 604:  * Returns the contents of the given View variable.
 605:  *
 606:  * @param string $var The view var you want the contents of.
 607:  * @param mixed $default The default/fallback content of $var.
 608:  * @return mixed The content of the named var if its set, otherwise $default.
 609:  */
 610:     public function get($var, $default = null) {
 611:         if (!isset($this->viewVars[$var])) {
 612:             return $default;
 613:         }
 614:         return $this->viewVars[$var];
 615:     }
 616: 
 617: /**
 618:  * Get the names of all the existing blocks.
 619:  *
 620:  * @return array An array containing the blocks.
 621:  * @see ViewBlock::keys()
 622:  */
 623:     public function blocks() {
 624:         return $this->Blocks->keys();
 625:     }
 626: 
 627: /**
 628:  * Start capturing output for a 'block'
 629:  *
 630:  * @param string $name The name of the block to capture for.
 631:  * @return void
 632:  * @see ViewBlock::start()
 633:  */
 634:     public function start($name) {
 635:         $this->Blocks->start($name);
 636:     }
 637: 
 638: /**
 639:  * Start capturing output for a 'block' if it has no content
 640:  *
 641:  * @param string $name The name of the block to capture for.
 642:  * @return void
 643:  * @see ViewBlock::startIfEmpty()
 644:  */
 645:     public function startIfEmpty($name) {
 646:         $this->Blocks->startIfEmpty($name);
 647:     }
 648: 
 649: /**
 650:  * Append to an existing or new block. Appending to a new
 651:  * block will create the block.
 652:  *
 653:  * @param string $name Name of the block
 654:  * @param mixed $value The content for the block.
 655:  * @return void
 656:  * @see ViewBlock::concat()
 657:  */
 658:     public function append($name, $value = null) {
 659:         $this->Blocks->concat($name, $value);
 660:     }
 661: 
 662: /**
 663:  * Prepend to an existing or new block. Prepending to a new
 664:  * block will create the block.
 665:  *
 666:  * @param string $name Name of the block
 667:  * @param mixed $value The content for the block.
 668:  * @return void
 669:  * @see ViewBlock::concat()
 670:  */
 671:     public function prepend($name, $value = null) {
 672:         $this->Blocks->concat($name, $value, ViewBlock::PREPEND);
 673:     }
 674: 
 675: /**
 676:  * Set the content for a block. This will overwrite any
 677:  * existing content.
 678:  *
 679:  * @param string $name Name of the block
 680:  * @param mixed $value The content for the block.
 681:  * @return void
 682:  * @see ViewBlock::set()
 683:  */
 684:     public function assign($name, $value) {
 685:         $this->Blocks->set($name, $value);
 686:     }
 687: 
 688: /**
 689:  * Fetch the content for a block. If a block is
 690:  * empty or undefined '' will be returned.
 691:  *
 692:  * @param string $name Name of the block
 693:  * @param string $default Default text
 694:  * @return string default The block content or $default if the block does not exist.
 695:  * @see ViewBlock::get()
 696:  */
 697:     public function fetch($name, $default = '') {
 698:         return $this->Blocks->get($name, $default);
 699:     }
 700: 
 701: /**
 702:  * End a capturing block. The compliment to View::start()
 703:  *
 704:  * @return void
 705:  * @see ViewBlock::end()
 706:  */
 707:     public function end() {
 708:         $this->Blocks->end();
 709:     }
 710: 
 711: /**
 712:  * Provides view or element extension/inheritance. Views can extends a
 713:  * parent view and populate blocks in the parent template.
 714:  *
 715:  * @param string $name The view or element to 'extend' the current one with.
 716:  * @return void
 717:  * @throws LogicException when you extend a view with itself or make extend loops.
 718:  * @throws LogicException when you extend an element which doesn't exist
 719:  */
 720:     public function extend($name) {
 721:         if ($name[0] === '/' || $this->_currentType === self::TYPE_VIEW) {
 722:             $parent = $this->_getViewFileName($name);
 723:         } else {
 724:             switch ($this->_currentType) {
 725:                 case self::TYPE_ELEMENT:
 726:                     $parent = $this->_getElementFileName($name);
 727:                     if (!$parent) {
 728:                         list($plugin, $name) = $this->pluginSplit($name);
 729:                         $paths = $this->_paths($plugin);
 730:                         $defaultPath = $paths[0] . 'Elements' . DS;
 731:                         throw new LogicException(__d(
 732:                             'cake_dev',
 733:                             'You cannot extend an element which does not exist (%s).',
 734:                             $defaultPath . $name . $this->ext
 735:                         ));
 736:                     }
 737:                     break;
 738:                 case self::TYPE_LAYOUT:
 739:                     $parent = $this->_getLayoutFileName($name);
 740:                     break;
 741:                 default:
 742:                     $parent = $this->_getViewFileName($name);
 743:             }
 744:         }
 745: 
 746:         if ($parent == $this->_current) {
 747:             throw new LogicException(__d('cake_dev', 'You cannot have views extend themselves.'));
 748:         }
 749:         if (isset($this->_parents[$parent]) && $this->_parents[$parent] == $this->_current) {
 750:             throw new LogicException(__d('cake_dev', 'You cannot have views extend in a loop.'));
 751:         }
 752:         $this->_parents[$this->_current] = $parent;
 753:     }
 754: 
 755: /**
 756:  * Adds a script block or other element to be inserted in $scripts_for_layout in
 757:  * the `<head />` of a document layout
 758:  *
 759:  * @param string $name Either the key name for the script, or the script content. Name can be used to
 760:  *   update/replace a script element.
 761:  * @param string $content The content of the script being added, optional.
 762:  * @return void
 763:  * @deprecated 3.0.0 Will be removed in 3.0. Superseded by blocks functionality.
 764:  * @see View::start()
 765:  */
 766:     public function addScript($name, $content = null) {
 767:         if (empty($content)) {
 768:             if (!in_array($name, array_values($this->_scripts))) {
 769:                 $this->_scripts[] = $name;
 770:             }
 771:         } else {
 772:             $this->_scripts[$name] = $content;
 773:         }
 774:     }
 775: 
 776: /**
 777:  * Generates a unique, non-random DOM ID for an object, based on the object type and the target URL.
 778:  *
 779:  * @param string $object Type of object, i.e. 'form' or 'link'
 780:  * @param string $url The object's target URL
 781:  * @return string
 782:  */
 783:     public function uuid($object, $url) {
 784:         $c = 1;
 785:         $url = Router::url($url);
 786:         $hash = $object . substr(md5($object . $url), 0, 10);
 787:         while (in_array($hash, $this->uuids)) {
 788:             $hash = $object . substr(md5($object . $url . $c), 0, 10);
 789:             $c++;
 790:         }
 791:         $this->uuids[] = $hash;
 792:         return $hash;
 793:     }
 794: 
 795: /**
 796:  * Allows a template or element to set a variable that will be available in
 797:  * a layout or other element. Analogous to Controller::set().
 798:  *
 799:  * @param string|array $one A string or an array of data.
 800:  * @param string|array $two Value in case $one is a string (which then works as the key).
 801:  *    Unused if $one is an associative array, otherwise serves as the values to $one's keys.
 802:  * @return void
 803:  */
 804:     public function set($one, $two = null) {
 805:         $data = null;
 806:         if (is_array($one)) {
 807:             if (is_array($two)) {
 808:                 $data = array_combine($one, $two);
 809:             } else {
 810:                 $data = $one;
 811:             }
 812:         } else {
 813:             $data = array($one => $two);
 814:         }
 815:         if (!$data) {
 816:             return false;
 817:         }
 818:         $this->viewVars = $data + $this->viewVars;
 819:     }
 820: /**
 821:  * Retrieve the current view type
 822:  *
 823:  * @return string
 824:  */
 825:     public function getCurrentType() {
 826:         return $this->_currentType;
 827:     }
 828: /**
 829:  * Magic accessor for helpers. Provides access to attributes that were deprecated.
 830:  *
 831:  * @param string $name Name of the attribute to get.
 832:  * @return mixed
 833:  */
 834:     public function __get($name) {
 835:         switch ($name) {
 836:             case 'base':
 837:             case 'here':
 838:             case 'webroot':
 839:             case 'data':
 840:                 return $this->request->{$name};
 841:             case 'action':
 842:                 return $this->request->params['action'];
 843:             case 'params':
 844:                 return $this->request;
 845:             case 'output':
 846:                 return $this->Blocks->get('content');
 847:         }
 848:         if (isset($this->Helpers->{$name})) {
 849:             $this->{$name} = $this->Helpers->{$name};
 850:             return $this->Helpers->{$name};
 851:         }
 852:         return $this->{$name};
 853:     }
 854: 
 855: /**
 856:  * Magic accessor for deprecated attributes.
 857:  *
 858:  * @param string $name Name of the attribute to set.
 859:  * @param mixed $value Value of the attribute to set.
 860:  * @return mixed
 861:  */
 862:     public function __set($name, $value) {
 863:         switch ($name) {
 864:             case 'output':
 865:                 return $this->Blocks->set('content', $value);
 866:             default:
 867:                 $this->{$name} = $value;
 868:         }
 869:     }
 870: 
 871: /**
 872:  * Magic isset check for deprecated attributes.
 873:  *
 874:  * @param string $name Name of the attribute to check.
 875:  * @return bool
 876:  */
 877:     public function __isset($name) {
 878:         if (isset($this->{$name})) {
 879:             return true;
 880:         }
 881:         $magicGet = array('base', 'here', 'webroot', 'data', 'action', 'params', 'output');
 882:         if (in_array($name, $magicGet)) {
 883:             return $this->__get($name) !== null;
 884:         }
 885:         return false;
 886:     }
 887: 
 888: /**
 889:  * Interact with the HelperCollection to load all the helpers.
 890:  *
 891:  * @return void
 892:  */
 893:     public function loadHelpers() {
 894:         $helpers = HelperCollection::normalizeObjectArray($this->helpers);
 895:         foreach ($helpers as $properties) {
 896:             list(, $class) = pluginSplit($properties['class']);
 897:             $this->{$class} = $this->Helpers->load($properties['class'], $properties['settings']);
 898:         }
 899:     }
 900: 
 901: /**
 902:  * Renders and returns output for given view filename with its
 903:  * array of data. Handles parent/extended views.
 904:  *
 905:  * @param string $viewFile Filename of the view
 906:  * @param array $data Data to include in rendered view. If empty the current View::$viewVars will be used.
 907:  * @return string Rendered output
 908:  * @triggers View.beforeRenderFile $this, array($viewFile)
 909:  * @triggers View.afterRenderFile $this, array($viewFile, $content)
 910:  * @throws CakeException when a block is left open.
 911:  */
 912:     protected function _render($viewFile, $data = array()) {
 913:         if (empty($data)) {
 914:             $data = $this->viewVars;
 915:         }
 916:         $this->_current = $viewFile;
 917:         $initialBlocks = count($this->Blocks->unclosed());
 918: 
 919:         $eventManager = $this->getEventManager();
 920:         $beforeEvent = new CakeEvent('View.beforeRenderFile', $this, array($viewFile));
 921: 
 922:         $eventManager->dispatch($beforeEvent);
 923:         $content = $this->_evaluate($viewFile, $data);
 924: 
 925:         $afterEvent = new CakeEvent('View.afterRenderFile', $this, array($viewFile, $content));
 926: 
 927:         $afterEvent->modParams = 1;
 928:         $eventManager->dispatch($afterEvent);
 929:         $content = $afterEvent->data[1];
 930: 
 931:         if (isset($this->_parents[$viewFile])) {
 932:             $this->_stack[] = $this->fetch('content');
 933:             $this->assign('content', $content);
 934: 
 935:             $content = $this->_render($this->_parents[$viewFile]);
 936:             $this->assign('content', array_pop($this->_stack));
 937:         }
 938: 
 939:         $remainingBlocks = count($this->Blocks->unclosed());
 940: 
 941:         if ($initialBlocks !== $remainingBlocks) {
 942:             throw new CakeException(__d('cake_dev', 'The "%s" block was left open. Blocks are not allowed to cross files.', $this->Blocks->active()));
 943:         }
 944: 
 945:         return $content;
 946:     }
 947: 
 948: /**
 949:  * Sandbox method to evaluate a template / view script in.
 950:  *
 951:  * @param string $viewFile Filename of the view
 952:  * @param array $dataForView Data to include in rendered view.
 953:  *    If empty the current View::$viewVars will be used.
 954:  * @return string Rendered output
 955:  */
 956:     protected function _evaluate($viewFile, $dataForView) {
 957:         $this->__viewFile = $viewFile;
 958:         extract($dataForView);
 959:         ob_start();
 960: 
 961:         include $this->__viewFile;
 962: 
 963:         unset($this->__viewFile);
 964:         return ob_get_clean();
 965:     }
 966: 
 967: /**
 968:  * Loads a helper. Delegates to the `HelperCollection::load()` to load the helper
 969:  *
 970:  * @param string $helperName Name of the helper to load.
 971:  * @param array $settings Settings for the helper
 972:  * @return Helper a constructed helper object.
 973:  * @see HelperCollection::load()
 974:  */
 975:     public function loadHelper($helperName, $settings = array()) {
 976:         return $this->Helpers->load($helperName, $settings);
 977:     }
 978: 
 979: /**
 980:  * Returns filename of given action's template file (.ctp) as a string.
 981:  * CamelCased action names will be under_scored! This means that you can have
 982:  * LongActionNames that refer to long_action_names.ctp views.
 983:  *
 984:  * @param string $name Controller action to find template filename for
 985:  * @return string Template filename
 986:  * @throws MissingViewException when a view file could not be found.
 987:  */
 988:     protected function _getViewFileName($name = null) {
 989:         $subDir = null;
 990: 
 991:         if ($this->subDir !== null) {
 992:             $subDir = $this->subDir . DS;
 993:         }
 994: 
 995:         if ($name === null) {
 996:             $name = $this->view;
 997:         }
 998:         $name = str_replace('/', DS, $name);
 999:         list($plugin, $name) = $this->pluginSplit($name);
1000: 
1001:         if (strpos($name, DS) === false && $name[0] !== '.') {
1002:             $name = $this->viewPath . DS . $subDir . Inflector::underscore($name);
1003:         } elseif (strpos($name, DS) !== false) {
1004:             if ($name[0] === DS || $name[1] === ':') {
1005:                 if (is_file($name)) {
1006:                     return $name;
1007:                 }
1008:                 $name = trim($name, DS);
1009:             } elseif ($name[0] === '.') {
1010:                 $name = substr($name, 3);
1011:             } elseif (!$plugin || $this->viewPath !== $this->name) {
1012:                 $name = $this->viewPath . DS . $subDir . $name;
1013:             }
1014:         }
1015:         $paths = $this->_paths($plugin);
1016:         $exts = $this->_getExtensions();
1017:         foreach ($exts as $ext) {
1018:             foreach ($paths as $path) {
1019:                 if (file_exists($path . $name . $ext)) {
1020:                     return $path . $name . $ext;
1021:                 }
1022:             }
1023:         }
1024:         throw new MissingViewException(array('file' => $name . $this->ext));
1025:     }
1026: 
1027: /**
1028:  * Splits a dot syntax plugin name into its plugin and filename.
1029:  * If $name does not have a dot, then index 0 will be null.
1030:  * It checks if the plugin is loaded, else filename will stay unchanged for filenames containing dot
1031:  *
1032:  * @param string $name The name you want to plugin split.
1033:  * @param bool $fallback If true uses the plugin set in the current CakeRequest when parsed plugin is not loaded
1034:  * @return array Array with 2 indexes. 0 => plugin name, 1 => filename
1035:  */
1036:     public function pluginSplit($name, $fallback = true) {
1037:         $plugin = null;
1038:         list($first, $second) = pluginSplit($name);
1039:         if (CakePlugin::loaded($first) === true) {
1040:             $name = $second;
1041:             $plugin = $first;
1042:         }
1043:         if (isset($this->plugin) && !$plugin && $fallback) {
1044:             $plugin = $this->plugin;
1045:         }
1046:         return array($plugin, $name);
1047:     }
1048: 
1049: /**
1050:  * Returns layout filename for this template as a string.
1051:  *
1052:  * @param string $name The name of the layout to find.
1053:  * @return string Filename for layout file (.ctp).
1054:  * @throws MissingLayoutException when a layout cannot be located
1055:  */
1056:     protected function _getLayoutFileName($name = null) {
1057:         if ($name === null) {
1058:             $name = $this->layout;
1059:         }
1060:         $subDir = null;
1061: 
1062:         if ($this->layoutPath !== null) {
1063:             $subDir = $this->layoutPath . DS;
1064:         }
1065:         list($plugin, $name) = $this->pluginSplit($name);
1066:         $paths = $this->_paths($plugin);
1067:         $file = 'Layouts' . DS . $subDir . $name;
1068: 
1069:         $exts = $this->_getExtensions();
1070:         foreach ($exts as $ext) {
1071:             foreach ($paths as $path) {
1072:                 if (file_exists($path . $file . $ext)) {
1073:                     return $path . $file . $ext;
1074:                 }
1075:             }
1076:         }
1077:         throw new MissingLayoutException(array('file' => $file . $this->ext));
1078:     }
1079: 
1080: /**
1081:  * Get the extensions that view files can use.
1082:  *
1083:  * @return array Array of extensions view files use.
1084:  */
1085:     protected function _getExtensions() {
1086:         $exts = array($this->ext);
1087:         if ($this->ext !== '.ctp') {
1088:             $exts[] = '.ctp';
1089:         }
1090:         return $exts;
1091:     }
1092: 
1093: /**
1094:  * Finds an element filename, returns false on failure.
1095:  *
1096:  * @param string $name The name of the element to find.
1097:  * @return mixed Either a string to the element filename or false when one can't be found.
1098:  */
1099:     protected function _getElementFileName($name) {
1100:         list($plugin, $name) = $this->pluginSplit($name);
1101: 
1102:         $paths = $this->_paths($plugin);
1103:         $exts = $this->_getExtensions();
1104:         foreach ($exts as $ext) {
1105:             foreach ($paths as $path) {
1106:                 if (file_exists($path . 'Elements' . DS . $name . $ext)) {
1107:                     return $path . 'Elements' . DS . $name . $ext;
1108:                 }
1109:             }
1110:         }
1111:         return false;
1112:     }
1113: 
1114: /**
1115:  * Return all possible paths to find view files in order
1116:  *
1117:  * @param string $plugin Optional plugin name to scan for view files.
1118:  * @param bool $cached Set to false to force a refresh of view paths. Default true.
1119:  * @return array paths
1120:  */
1121:     protected function _paths($plugin = null, $cached = true) {
1122:         if ($cached === true) {
1123:             if ($plugin === null && !empty($this->_paths)) {
1124:                 return $this->_paths;
1125:             }
1126:             if ($plugin !== null && isset($this->_pathsForPlugin[$plugin])) {
1127:                 return $this->_pathsForPlugin[$plugin];
1128:             }
1129:         }
1130:         $paths = array();
1131:         $viewPaths = App::path('View');
1132:         $corePaths = array_merge(App::core('View'), App::core('Console/Templates/skel/View'));
1133: 
1134:         if (!empty($plugin)) {
1135:             $count = count($viewPaths);
1136:             for ($i = 0; $i < $count; $i++) {
1137:                 if (!in_array($viewPaths[$i], $corePaths)) {
1138:                     $paths[] = $viewPaths[$i] . 'Plugin' . DS . $plugin . DS;
1139:                 }
1140:             }
1141:             $paths = array_merge($paths, App::path('View', $plugin));
1142:         }
1143: 
1144:         $paths = array_unique(array_merge($paths, $viewPaths));
1145:         if (!empty($this->theme)) {
1146:             $theme = Inflector::camelize($this->theme);
1147:             $themePaths = array();
1148:             foreach ($paths as $path) {
1149:                 if (strpos($path, DS . 'Plugin' . DS) === false) {
1150:                     if ($plugin) {
1151:                         $themePaths[] = $path . 'Themed' . DS . $theme . DS . 'Plugin' . DS . $plugin . DS;
1152:                     }
1153:                     $themePaths[] = $path . 'Themed' . DS . $theme . DS;
1154:                 }
1155:             }
1156:             $paths = array_merge($themePaths, $paths);
1157:         }
1158:         $paths = array_merge($paths, $corePaths);
1159:         if ($plugin !== null) {
1160:             return $this->_pathsForPlugin[$plugin] = $paths;
1161:         }
1162:         return $this->_paths = $paths;
1163:     }
1164: 
1165: /**
1166:  * Checks if an element is cached and returns the cached data if present
1167:  *
1168:  * @param string $name Element name
1169:  * @param string $data Data
1170:  * @param array $options Element options
1171:  * @return string|null
1172:  */
1173:     protected function _elementCache($name, $data, $options) {
1174:         $plugin = null;
1175:         list($plugin, $name) = $this->pluginSplit($name);
1176: 
1177:         $underscored = null;
1178:         if ($plugin) {
1179:             $underscored = Inflector::underscore($plugin);
1180:         }
1181:         $keys = array_merge(array($underscored, $name), array_keys($options), array_keys($data));
1182:         $this->elementCacheSettings = array(
1183:             'config' => $this->elementCache,
1184:             'key' => implode('_', $keys)
1185:         );
1186:         if (is_array($options['cache'])) {
1187:             $defaults = array(
1188:                 'config' => $this->elementCache,
1189:                 'key' => $this->elementCacheSettings['key']
1190:             );
1191:             $this->elementCacheSettings = array_merge($defaults, $options['cache']);
1192:         }
1193:         $this->elementCacheSettings['key'] = 'element_' . $this->elementCacheSettings['key'];
1194:         return Cache::read($this->elementCacheSettings['key'], $this->elementCacheSettings['config']);
1195:     }
1196: 
1197: /**
1198:  * Renders an element and fires the before and afterRender callbacks for it
1199:  * and writes to the cache if a cache is used
1200:  *
1201:  * @param string $file Element file path
1202:  * @param array $data Data to render
1203:  * @param array $options Element options
1204:  * @return string
1205:  * @triggers View.beforeRender $this, array($file)
1206:  * @triggers View.afterRender $this, array($file, $element)
1207:  */
1208:     protected function _renderElement($file, $data, $options) {
1209:         $current = $this->_current;
1210:         $restore = $this->_currentType;
1211:         $this->_currentType = self::TYPE_ELEMENT;
1212: 
1213:         if ($options['callbacks']) {
1214:             $this->getEventManager()->dispatch(new CakeEvent('View.beforeRender', $this, array($file)));
1215:         }
1216: 
1217:         $element = $this->_render($file, array_merge($this->viewVars, $data));
1218: 
1219:         if ($options['callbacks']) {
1220:             $this->getEventManager()->dispatch(new CakeEvent('View.afterRender', $this, array($file, $element)));
1221:         }
1222: 
1223:         $this->_currentType = $restore;
1224:         $this->_current = $current;
1225: 
1226:         if (isset($options['cache'])) {
1227:             Cache::write($this->elementCacheSettings['key'], $element, $this->elementCacheSettings['config']);
1228:         }
1229:         return $element;
1230:     }
1231: }
1232: 
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