define([

"./core",
"./var/rnotwhite",
"./core/access",
"./data/var/data_priv",
"./data/var/data_user"

], function( jQuery, rnotwhite, access, data_priv, data_user ) {

// 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 = /^(?:{[wW]*}|[[wW]*])$/,

rmultiDash = /([A-Z])/g;

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, "-$1" ).toLowerCase();
        data = elem.getAttribute( name );

        if ( typeof data === "string" ) {
                try {
                        data = data === "true" ? true :
                                data === "false" ? false :
                                data === "null" ? null :
                                // Only convert to a number if it doesn't change the string
                                +data + "" === data ? +data :
                                rbrace.test( data ) ? jQuery.parseJSON( data ) :
                                data;
                } catch( e ) {}

                // Make sure we set the data so it isn't changed later
                data_user.set( elem, key, data );
        } else {
                data = undefined;
        }
}
return data;

}

jQuery.extend({

hasData: function( elem ) {
        return data_user.hasData( elem ) || data_priv.hasData( elem );
},

data: function( elem, name, data ) {
        return data_user.access( elem, name, data );
},

removeData: function( elem, name ) {
        data_user.remove( elem, name );
},

// TODO: Now that all calls to _data and _removeData have been replaced
// with direct calls to data_priv methods, these can be deprecated.
_data: function( elem, name, data ) {
        return data_priv.access( elem, name, data );
},

_removeData: function( elem, name ) {
        data_priv.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 = data_user.get( elem );

                        if ( elem.nodeType === 1 && !data_priv.get( elem, "hasDataAttrs" ) ) {
                                i = attrs.length;
                                while ( i-- ) {

                                        // Support: IE11+
                                        // The attrs elements can be null (#14894)
                                        if ( attrs[ i ] ) {
                                                name = attrs[ i ].name;
                                                if ( name.indexOf( "data-" ) === 0 ) {
                                                        name = jQuery.camelCase( name.slice(5) );
                                                        dataAttr( elem, name, data[ name ] );
                                                }
                                        }
                                }
                                data_priv.set( elem, "hasDataAttrs", true );
                        }
                }

                return data;
        }

        // Sets multiple values
        if ( typeof key === "object" ) {
                return this.each(function() {
                        data_user.set( this, key );
                });
        }

        return access( this, function( value ) {
                var data,
                        camelKey = jQuery.camelCase( key );

                // 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
                        // with the key as-is
                        data = data_user.get( elem, key );
                        if ( data !== undefined ) {
                                return data;
                        }

                        // Attempt to get data from the cache
                        // with the key camelized
                        data = data_user.get( elem, camelKey );
                        if ( data !== undefined ) {
                                return data;
                        }

                        // Attempt to "discover" the data in
                        // HTML5 custom data-* attrs
                        data = dataAttr( elem, camelKey, undefined );
                        if ( data !== undefined ) {
                                return data;
                        }

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

                // Set the data...
                this.each(function() {
                        // First, attempt to store a copy or reference of any
                        // data that might've been store with a camelCased key.
                        var data = data_user.get( this, camelKey );

                        // For HTML5 data-* attribute interop, we have to
                        // store property names with dashes in a camelCase form.
                        // This might not apply to all properties...*
                        data_user.set( this, camelKey, value );

                        // *... In the case of properties that might _actually_
                        // have dashes, we need to also store a copy of that
                        // unchanged property.
                        if ( key.indexOf("-") !== -1 && data !== undefined ) {
                                data_user.set( this, key, value );
                        }
                });
        }, null, value, arguments.length > 1, null, true );
},

removeData: function( key ) {
        return this.each(function() {
                data_user.remove( this, key );
        });
}

});

return jQuery; });