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var valid_types = require( '../query/types' );
/**
* Calculate the set-style intersection of two arrays
*/
var intersection = function intersection(set1, set2) {
return set2.filter(function(value) {
return set1.indexOf(value) !== -1;
});
};
/**
* Combine all types and determine the unique subset
*
* @param {Array} clean_types
* @returns {Array}
*/
module.exports = function calculate_types(clean_types) {
if (!clean_types || !(clean_types.from_layers || clean_types.from_sources || clean_types.from_address_parser)) {
throw new Error('clean_types should not be null or undefined');
}
/* the layers and source parameters are cumulative:
* perform a set intersection of their specified types
*/
if (clean_types.from_layers || clean_types.from_sources) {
var types = valid_types;
if (clean_types.from_layers) {
types = intersection(types, clean_types.from_layers);
}
if (clean_types.from_sources) {
types = intersection(types, clean_types.from_sources);
}
return types;
}
/*
* Type restrictions requested by the address parser should only be used
* if both the source and layers parameters are empty, so do this last
*/
if (clean_types.from_address_parser) {
return clean_types.from_address_parser;
}
throw new Error('no types specified');
};