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// Copyright 2009 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/**
* @fileoverview Useful compiler idioms.
*
*/
goog.provide('goog.reflect');
/**
* Syntax for object literal casts.
* @see http://go/jscompiler-renaming
* @see http://code.google.com/p/closure-compiler/wiki/
* ExperimentalTypeBasedPropertyRenaming
*
* Use this if you have an object literal whose keys need to have the same names
* as the properties of some class even after they are renamed by the compiler.
*
* @param {!Function} type Type to cast to.
* @param {Object} object Object literal to cast.
* @return {Object} The object literal.
*/
goog.reflect.object = function(type, object) {
return object;
};
/**
* To assert to the compiler that an operation is needed when it would
* otherwise be stripped. For example:
* <code>
* // Force a layout
* goog.reflect.sinkValue(dialog.offsetHeight);
* </code>
* @type {!Function}
*/
goog.reflect.sinkValue = function(x) {
goog.reflect.sinkValue[' '](x);
return x;
};
/**
* The compiler should optimize this function away iff no one ever uses
* goog.reflect.sinkValue.
*/
goog.reflect.sinkValue[' '] = goog.nullFunction;
/**
* Check if a property can be accessed without throwing an exception.
* @param {Object} obj The owner of the property.
* @param {string} prop The property name.
* @return {boolean} Whether the property is accessible. Will also return true
* if obj is null.
*/
goog.reflect.canAccessProperty = function(obj, prop) {
/** @preserveTry */
try {
goog.reflect.sinkValue(obj[prop]);
return true;
} catch (e) {}
return false;
};
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