35 lines
1.6 KiB
PL/PgSQL
35 lines
1.6 KiB
PL/PgSQL
CREATE OR REPLACE FUNCTION brunnel(is_bridge BOOL, is_tunnel BOOL, is_ford BOOL) RETURNS TEXT AS $$
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SELECT CASE
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WHEN is_bridge THEN 'bridge'
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WHEN is_tunnel THEN 'tunnel'
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WHEN is_ford THEN 'ford'
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ELSE NULL
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END;
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$$ 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) RETURNS TEXT AS $$
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SELECT CASE
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WHEN highway IN ('motorway', 'motorway_link') THEN 'motorway'
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WHEN highway IN ('trunk', 'trunk_link') THEN 'trunk'
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WHEN highway IN ('primary', 'primary_link') THEN 'primary'
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WHEN highway IN ('secondary', 'secondary_link') THEN 'secondary'
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WHEN highway IN ('tertiary', 'tertiary_link') THEN 'tertiary'
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WHEN highway IN ('unclassified', 'residential', 'living_street', 'road') THEN 'minor'
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WHEN highway IN ('service', 'track') THEN highway
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WHEN highway IN ('pedestrian', 'path', 'footway', 'cycleway', 'steps') THEN 'path'
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ELSE NULL
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END;
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$$ LANGUAGE SQL IMMUTABLE STRICT;
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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 $$
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SELECT CASE
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WHEN railway IN ('rail', 'narrow_gauge', 'preserved', 'funicular') THEN 'rail'
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WHEN railway IN ('subway', 'light_rail', 'monorail', 'tram') THEN 'transit'
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ELSE NULL
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END;
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$$ LANGUAGE SQL IMMUTABLE STRICT;
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