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41 lines
1.0 KiB
41 lines
1.0 KiB
var valid_types = require( '../query/types' ); |
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/** |
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* Calculate the set-style intersection of two arrays |
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*/ |
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var intersection = function intersection(set1, set2) { |
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return set2.filter(function(value) { |
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return set1.indexOf(value) !== -1; |
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}); |
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}; |
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module.exports = function calculate_types(clean_types) { |
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if (!clean_types) { |
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return undefined; |
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} |
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/* the layers and source parameters are cumulative: |
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* perform a set insersection of their specified types |
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*/ |
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if (clean_types.from_layers || clean_types.from_source) { |
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var types = valid_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_source) { |
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types = intersection(types, clean_types.from_source); |
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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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}; |