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-- location_extract_place_exact(string, stateAbbrev)
-- This function checks the place_lookup table to find a potential match to
-- the location described at the end of the given string. If an exact match
-- fails, a fuzzy match is performed. The location as found in the given
-- string is returned.
CREATE OR REPLACE FUNCTION location_extract_place_exact(
fullStreet VARCHAR,
stateAbbrev VARCHAR
) RETURNS VARCHAR
AS $_$
DECLARE
ws VARCHAR;
location VARCHAR;
tempInt INTEGER;
lstate VARCHAR;
rec RECORD;
BEGIN
ws := E'[ ,.\n\f\t]';
-- Try for an exact match against places
IF stateAbbrev IS NOT NULL THEN
lstate := statefp FROM state WHERE stusps = stateAbbrev;
SELECT INTO tempInt count(*) FROM place
WHERE place.statefp = lstate AND fullStreet ILIKE '%' || name || '%'
AND texticregexeq(fullStreet, '(?i)' || name || '$');
ELSE
SELECT INTO tempInt count(*) FROM place
WHERE fullStreet ILIKE '%' || name || '%' AND
texticregexeq(fullStreet, '(?i)' || name || '$');
END IF;
IF tempInt > 0 THEN
-- Some matches were found. Look for the last one in the string.
IF stateAbbrev IS NOT NULL THEN
FOR rec IN SELECT substring(fullStreet, '(?i)('
|| name || ')$') AS value, name FROM place
WHERE place.statefp = lstate AND fullStreet ILIKE '%' || name || '%'
AND texticregexeq(fullStreet, '(?i)'
|| name || '$') ORDER BY length(name) DESC LOOP
-- Since the regex is end of string, only the longest (first) result
-- is useful.
location := rec.value;
EXIT;
END LOOP;
ELSE
FOR rec IN SELECT substring(fullStreet, '(?i)('
|| name || ')$') AS value, name FROM place
WHERE fullStreet ILIKE '%' || name || '%' AND texticregexeq(fullStreet, '(?i)'
|| name || '$') ORDER BY length(name) DESC LOOP
-- Since the regex is end of string, only the longest (first) result
-- is useful.
location := rec.value;
EXIT;
END LOOP;
END IF;
END IF;
RETURN location;
END;
$_$ LANGUAGE plpgsql STABLE COST 100;
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