define( [

	"./core",

	"./core/access",

	"./core/camelCase",

	"./data/var/dataPriv",

	"./data/var/dataUser"

], function( jQuery, access, camelCase, dataPriv, dataUser ) {



"use strict";



//	Implementation Summary

//

//	1. Enforce API surface and semantic compatibility with 1.9.x branch

//	2. Improve the module's maintainability by reducing the storage

//		paths to a single mechanism.

//	3. Use the same single mechanism to support "private" and "user" data.

//	4. _Never_ expose "private" data to user code (TODO: Drop _data, _removeData)

//	5. Avoid exposing implementation details on user objects (eg. expando properties)

//	6. Provide a clear path for implementation upgrade to WeakMap in 2014



var rbrace = /^(?:\{[\w\W]*\}|\[[\w\W]*\])$/,

	rmultiDash = /[A-Z]/g;



function getData( data ) {

	if ( data === "true" ) {

		return true;

	}



	if ( data === "false" ) {

		return false;

	}



	if ( data === "null" ) {

		return null;

	}



	// Only convert to a number if it doesn't change the string

	if ( data === +data + "" ) {

		return +data;

	}



	if ( rbrace.test( data ) ) {

		return JSON.parse( data );

	}



	return data;

}



function dataAttr( elem, key, data ) {

	var name;



	// If nothing was found internally, try to fetch any

	// data from the HTML5 data-* attribute

	if ( data === undefined && elem.nodeType === 1 ) {

		name = "data-" + key.replace( rmultiDash, "-$&" ).toLowerCase();

		data = elem.getAttribute( name );



		if ( typeof data === "string" ) {

			try {

				data = getData( data );

			} catch ( e ) {}



			// Make sure we set the data so it isn't changed later

			dataUser.set( elem, key, data );

		} else {

			data = undefined;

		}

	}

	return data;

}



jQuery.extend( {

	hasData: function( elem ) {

		return dataUser.hasData( elem ) || dataPriv.hasData( elem );

	},



	data: function( elem, name, data ) {

		return dataUser.access( elem, name, data );

	},



	removeData: function( elem, name ) {

		dataUser.remove( elem, name );

	},



	// TODO: Now that all calls to _data and _removeData have been replaced

	// with direct calls to dataPriv methods, these can be deprecated.

	_data: function( elem, name, data ) {

		return dataPriv.access( elem, name, data );

	},



	_removeData: function( elem, name ) {

		dataPriv.remove( elem, name );

	}

} );



jQuery.fn.extend( {

	data: function( key, value ) {

		var i, name, data,

			elem = this[ 0 ],

			attrs = elem && elem.attributes;



		// Gets all values

		if ( key === undefined ) {

			if ( this.length ) {

				data = dataUser.get( elem );



				if ( elem.nodeType === 1 && !dataPriv.get( elem, "hasDataAttrs" ) ) {

					i = attrs.length;

					while ( i-- ) {



						// Support: IE 11 only

						// The attrs elements can be null (#14894)

						if ( attrs[ i ] ) {

							name = attrs[ i ].name;

							if ( name.indexOf( "data-" ) === 0 ) {

								name = camelCase( name.slice( 5 ) );

								dataAttr( elem, name, data[ name ] );

							}

						}

					}

					dataPriv.set( elem, "hasDataAttrs", true );

				}

			}



			return data;

		}



		// Sets multiple values

		if ( typeof key === "object" ) {

			return this.each( function() {

				dataUser.set( this, key );

			} );

		}



		return access( this, function( value ) {

			var data;



			// The calling jQuery object (element matches) is not empty

			// (and therefore has an element appears at this[ 0 ]) and the

			// `value` parameter was not undefined. An empty jQuery object

			// will result in `undefined` for elem = this[ 0 ] which will

			// throw an exception if an attempt to read a data cache is made.

			if ( elem && value === undefined ) {



				// Attempt to get data from the cache

				// The key will always be camelCased in Data

				data = dataUser.get( elem, key );

				if ( data !== undefined ) {

					return data;

				}



				// Attempt to "discover" the data in

				// HTML5 custom data-* attrs

				data = dataAttr( elem, key );

				if ( data !== undefined ) {

					return data;

				}



				// We tried really hard, but the data doesn't exist.

				return;

			}



			// Set the data...

			this.each( function() {



				// We always store the camelCased key

				dataUser.set( this, key, value );

			} );

		}, null, value, arguments.length > 1, null, true );

	},



	removeData: function( key ) {

		return this.each( function() {

			dataUser.remove( this, key );

		} );

	}

} );



return jQuery;

} );

