ractive/src/viewmodel/adaptConfig.js

Next-generation DOM manipulation

// should this be combined with prototype/adapt.js?

var configure = {

	lookup: function ( target, adaptors ) {

		var i, adapt = target.adapt;

		if ( !adapt || !adapt.length ) { return adapt; }


		if ( adaptors && Object.keys( adaptors ).length && ( i = adapt.length ) ) {
			while ( i-- ) {
				let adaptor = adapt[i];

				if ( typeof adaptor === 'string' ) {
					adapt[i] = adaptors[ adaptor ] || adaptor;
				}
			}
		}

		return adapt;
	},

	combine: function ( parent, adapt ) {

		// normalize 'Foo' to [ 'Foo' ]
		parent = arrayIfString( parent );
		adapt = arrayIfString( adapt );

		// no parent? return adapt
		if ( !parent || !parent.length) { return adapt; }

		// no adapt? return 'copy' of parent
		if ( !adapt || !adapt.length ) { return parent.slice(); }

		// add parent adaptors to options
		parent.forEach( a => {
			// don't put in duplicates
			if ( adapt.indexOf( a ) === -1 ) {
				adapt.push( a );
			}
		});

		return adapt;
	}
};

function arrayIfString ( adapt ) {
	if ( typeof adapt === 'string' ) {
		adapt = [ adapt ];
	}

	return adapt;
}

export default configure;