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41 lines
1.2 KiB
41 lines
1.2 KiB
var type_mapping = require( '../helper/type_mapping' ); |
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var _ = require('lodash'); |
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/** |
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* Combine all types and determine the unique subset |
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* |
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* @param {Array} clean_types |
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* @returns {Array} |
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*/ |
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module.exports = function calculate_types(clean_types) { |
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if (!clean_types || !(clean_types.from_layers || clean_types.from_sources || clean_types.from_address_parser)) { |
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throw new Error('clean_types should not be null or undefined'); |
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} |
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/* the layers and source parameters are cumulative: |
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* perform a set intersection of their specified types |
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*/ |
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if (clean_types.from_layers || clean_types.from_sources) { |
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var types = type_mapping.types; |
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if (clean_types.from_layers) { |
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types = _.intersection(types, clean_types.from_layers); |
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} |
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if (clean_types.from_sources) { |
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types = _.intersection(types, clean_types.from_sources); |
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} |
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return types; |
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} |
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/* |
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* Type restrictions requested by the address parser should only be used |
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* if both the source and layers parameters are empty, so do this last |
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*/ |
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if (clean_types.from_address_parser) { |
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return clean_types.from_address_parser; |
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} |
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throw new Error('no types specified'); |
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};
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