+
+CREATE OR REPLACE FUNCTION get_postcode_rank(country_code VARCHAR(2), postcode TEXT,
+ OUT rank_search SMALLINT, OUT rank_address SMALLINT)
+AS $$
+DECLARE
+ part TEXT;
+BEGIN
+ rank_search := 30;
+ rank_address := 30;
+
+ IF country_code = 'gb' THEN
+ IF postcode ~ '^([A-Z][A-Z]?[0-9][0-9A-Z]? [0-9][A-Z][A-Z])$' THEN
+ rank_search := 25;
+ rank_address := 5;
+ ELSEIF postcode ~ '^([A-Z][A-Z]?[0-9][0-9A-Z]? [0-9])$' THEN
+ rank_search := 23;
+ rank_address := 5;
+ ELSEIF postcode ~ '^([A-Z][A-Z]?[0-9][0-9A-Z])$' THEN
+ rank_search := 21;
+ rank_address := 5;
+ END IF;
+
+ ELSEIF country_code = 'sg' THEN
+ IF postcode ~ '^([0-9]{6})$' THEN
+ rank_search := 25;
+ rank_address := 11;
+ END IF;
+
+ ELSEIF country_code = 'de' THEN
+ IF postcode ~ '^([0-9]{5})$' THEN
+ rank_search := 21;
+ rank_address := 11;
+ END IF;
+
+ ELSE
+ -- Guess at the postcode format and coverage (!)
+ IF postcode ~ '^[A-Z0-9]{1,5}$' THEN -- Probably too short to be very local
+ rank_search := 21;
+ rank_address := 11;
+ ELSE
+ -- Does it look splitable into and area and local code?
+ part := substring(postcode from '^([- :A-Z0-9]+)([- :][A-Z0-9]+)$');
+
+ IF part IS NOT NULL THEN
+ rank_search := 25;
+ rank_address := 11;
+ ELSEIF postcode ~ '^[- :A-Z0-9]{6,}$' THEN
+ rank_search := 21;
+ rank_address := 11;
+ END IF;
+ END IF;
+ END IF;
+
+END;
+$$
+LANGUAGE plpgsql IMMUTABLE;
+
+-- Find the nearest artificial postcode for the given geometry.
+-- TODO For areas there should not be more than two inside the geometry.
+CREATE OR REPLACE FUNCTION get_nearest_postcode(country VARCHAR(2), geom GEOMETRY) RETURNS TEXT
+ AS $$
+DECLARE
+ item RECORD;
+BEGIN
+ FOR item IN
+ SELECT postcode FROM location_postcode
+ WHERE ST_DWithin(geom, location_postcode.geometry, 0.05)
+ AND location_postcode.country_code = country
+ ORDER BY ST_Distance(geom, location_postcode.geometry)
+ LIMIT 1
+ LOOP
+ RETURN item.postcode;
+ END LOOP;
+
+ RETURN null;
+END;
+$$
+LANGUAGE plpgsql;
+
+