/**

* Copyright 2013-2015, Facebook, Inc.

* All rights reserved.

*

* This source code is licensed under the BSD-style license found in the

* LICENSE file in the root directory of this source tree. An additional grant

* of patent rights can be found in the PATENTS file in the same directory.

*

* @providesModule ReactContext

*/

'use strict';

var assign = require("./Object.assign");

var emptyObject = require("./emptyObject");

var warning = require("./warning");

var didWarn = false;

/**

* Keeps track of the current context.

*

* The context is automatically passed down the component ownership hierarchy

* and is accessible via `this.context` on ReactCompositeComponents.

*/

var ReactContext = {

/**

* @internal

* @type {object}

*/

current: emptyObject,

/**

* Temporarily extends the current context while executing scopedCallback.

*

* A typical use case might look like

*

* render: function() {

* var children = ReactContext.withContext({foo: 'foo'}, () => (

*

* ));

* return <div>{children}</div>;

* }

*

* @param {object} newContext New context to merge into the existing context

* @param {function} scopedCallback Callback to run with the new context

* @return {ReactComponent|array<ReactComponent>}

*/

withContext: function(newContext, scopedCallback) {

if ("production" !== process.env.NODE_ENV) {

("production" !== process.env.NODE_ENV ? warning(

didWarn,

'withContext is deprecated and will be removed in a future version. ' +

'Use a wrapper component with getChildContext instead.'

) : null);

didWarn = true;

}

var result;

var previousContext = ReactContext.current;

ReactContext.current = assign({}, previousContext, newContext);

try {

result = scopedCallback();

} finally {

ReactContext.current = previousContext;

}

return result;

}

};

module.exports = ReactContext;