c9e7ad90c6
Minor code cleanup: SQL already returns NULL in the "WHEN" condition if it is not matched by any of the cases. Co-authored-by: Eva Jelinkova <evka.jelinkova@gmail.com>
55 lines
3.0 KiB
PL/PgSQL
55 lines
3.0 KiB
PL/PgSQL
CREATE OR REPLACE FUNCTION brunnel(is_bridge BOOL, is_tunnel BOOL, is_ford BOOL) RETURNS TEXT AS $$
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SELECT CASE
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WHEN is_bridge THEN 'bridge'
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WHEN is_tunnel THEN 'tunnel'
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WHEN is_ford THEN 'ford'
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END;
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$$ LANGUAGE SQL IMMUTABLE STRICT;
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-- The classes for highways are derived from the classes used in ClearTables
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-- https://github.com/ClearTables/ClearTables/blob/master/transportation.lua
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CREATE OR REPLACE FUNCTION highway_class(highway TEXT, public_transport TEXT, construction TEXT) RETURNS TEXT AS $$
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SELECT CASE
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%%FIELD_MAPPING: class %%
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WHEN highway = 'construction' THEN CASE
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WHEN construction IN ('motorway', 'motorway_link') THEN 'motorway_construction'
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WHEN construction IN ('trunk', 'trunk_link') THEN 'trunk_construction'
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WHEN construction IN ('primary', 'primary_link') THEN 'primary_construction'
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WHEN construction IN ('secondary', 'secondary_link') THEN 'secondary_construction'
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WHEN construction IN ('tertiary', 'tertiary_link') THEN 'tertiary_construction'
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WHEN construction IN ('', 'unclassified', 'residential', 'living_street', 'road') THEN 'minor_construction'
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WHEN construction IN ('pedestrian', 'path', 'footway', 'cycleway', 'steps', 'bridleway', 'corridor')
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OR public_transport = 'platform' THEN 'path_construction'
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WHEN construction = 'service' THEN 'service_construction'
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WHEN construction = 'track' THEN 'track_construction'
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WHEN construction = 'raceway' THEN 'raceway_construction'
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END
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END;
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$$ LANGUAGE SQL IMMUTABLE;
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-- The classes for railways are derived from the classes used in ClearTables
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-- https://github.com/ClearTables/ClearTables/blob/master/transportation.lua
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CREATE OR REPLACE FUNCTION railway_class(railway TEXT) RETURNS TEXT AS $$
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SELECT CASE
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WHEN railway IN ('rail', 'narrow_gauge', 'preserved', 'funicular') THEN 'rail'
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WHEN railway IN ('subway', 'light_rail', 'monorail', 'tram') THEN 'transit'
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END;
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$$ LANGUAGE SQL IMMUTABLE STRICT;
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-- Limit service to only the most important values to ensure
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-- we always know the values of service
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CREATE OR REPLACE FUNCTION service_value(service TEXT) RETURNS TEXT AS $$
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SELECT CASE
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WHEN service IN ('spur', 'yard', 'siding', 'crossover', 'driveway', 'alley', 'parking_aisle') THEN service
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END;
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$$ LANGUAGE SQL IMMUTABLE STRICT;
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-- Limit surface to only the most important values to ensure
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-- we always know the values of surface
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CREATE OR REPLACE FUNCTION surface_value(surface TEXT) RETURNS TEXT AS $$
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SELECT CASE
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WHEN surface IN ('paved', 'asphalt', 'cobblestone', 'concrete', 'concrete:lanes', 'concrete:plates', 'metal', 'paving_stones', 'sett', 'unhewn_cobblestone', 'wood') THEN 'paved'
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WHEN surface IN ('unpaved', 'compacted', 'dirt', 'earth', 'fine_gravel', 'grass', 'grass_paver', 'gravel', 'gravel_turf', 'ground', 'ice', 'mud', 'pebblestone', 'salt', 'sand', 'snow', 'woodchips') THEN 'unpaved'
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END;
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$$ LANGUAGE SQL IMMUTABLE STRICT;
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