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Manage field mapping in SQL declaratively

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Simplify some of the OSM->OMT field value mappings using declarative syntax.

This approach is not for all cases, but in many it removes
the need of storing the same field in both the .yaml and .sql files.

TODO: support more complex AND/OR cases
This commit is contained in:
Yuri Astrakhan
2019-10-26 04:28:51 -04:00
parent f3667170f6
commit 1614a4656c
10 changed files with 156 additions and 120 deletions
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18
layers/transportation/class.sql
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@@ -11,23 +11,19 @@ $$ LANGUAGE SQL IMMUTABLE STRICT;
-- https://github.com/ClearTables/ClearTables/blob/master/transportation.lua
CREATE OR REPLACE FUNCTION highway_class(highway TEXT, public_transport TEXT, construction TEXT) RETURNS TEXT AS $$
SELECT CASE
WHEN highway IN ('motorway', 'motorway_link') THEN 'motorway'
WHEN highway IN ('trunk', 'trunk_link') THEN 'trunk'
WHEN highway IN ('primary', 'primary_link') THEN 'primary'
WHEN highway IN ('secondary', 'secondary_link') THEN 'secondary'
WHEN highway IN ('tertiary', 'tertiary_link') THEN 'tertiary'
WHEN highway IN ('unclassified', 'residential', 'living_street', 'road') THEN 'minor'
WHEN highway IN ('pedestrian', 'path', 'footway', 'cycleway', 'steps', 'bridleway', 'corridor') OR public_transport IN ('platform') THEN 'path'
WHEN highway IN ('service', 'track', 'raceway') THEN highway
%%FIELD_MAPPING: class %%
WHEN highway = 'construction' THEN CASE
WHEN construction IN ('motorway', 'motorway_link') THEN 'motorway_construction'
WHEN construction IN ('trunk', 'trunk_link') THEN 'trunk_construction'
WHEN construction IN ('primary', 'primary_link') THEN 'primary_construction'
WHEN construction IN ('secondary', 'secondary_link') THEN 'secondary_construction'
WHEN construction IN ('tertiary', 'tertiary_link') THEN 'tertiary_construction'
WHEN construction = '' OR construction IN ('unclassified', 'residential', 'living_street', 'road') THEN 'minor_construction'
WHEN construction IN ('pedestrian', 'path', 'footway', 'cycleway', 'steps', 'bridleway', 'corridor') OR public_transport IN ('platform') THEN 'path_construction'
WHEN construction IN ('service', 'track', 'raceway') THEN CONCAT(highway, '_construction')
WHEN construction IN ('', 'unclassified', 'residential', 'living_street', 'road') THEN 'minor_construction'
WHEN construction IN ('pedestrian', 'path', 'footway', 'cycleway', 'steps', 'bridleway', 'corridor')
OR public_transport = 'platform' THEN 'path_construction'
WHEN construction = 'service' THEN 'service_construction'
WHEN construction = 'track' THEN 'track_construction'
WHEN construction = 'raceway' THEN 'raceway_construction'
ELSE NULL
END
ELSE NULL