import-sql/language.sql at master · Sophox/import-sql · GitHub

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CREATE OR REPLACEFUNCTIONdelete_empty_keys(tags hstore) RETURNS hstore AS $$
DECLARE
 result hstore;
BEGIN
select
 hstore(array_agg(key), array_agg(value)) into result
from
 each(hstore(tags))
where nullif(value, '') is not null;
 RETURN result;
END;
$$ STRICT
LANGUAGE plpgsql IMMUTABLE;


CREATE OR REPLACEFUNCTIONremove_latin(text) RETURNS textAS $$
 DECLARE
 i integer;
 DECLARE
 letter text;
 result text='';
BEGIN
 FOR i IN1..char_length($1) LOOP
 letter := substr($1, i, 1);
 IF (unaccent(letter) !~ '^[a-zA-Z].*') THEN
 result := result || letter;
 END IF;
 END LOOP;
 result := regexp_replace(result, '(\([ -.]*\)|\[[ -.]*\])', '');
 result := regexp_replace(result, ' +\. *$', '');
 result :=trim(both ' -\n'from result);
 RETURN result;
 END;
$$ LANGUAGE 'plpgsql' IMMUTABLE;

-- See osml10n_is_latin
-- https://github.com/giggls/mapnik-german-l10n/blob/ea5da9cdfa6c931ae73eac747849140547ecd321/plpgsql/get_localized_name.sql#L19
CREATE or REPLACEFUNCTIONomt_is_latin(text) RETURNS BOOLEANAS $$
 DECLARE
 i integer;
 ascii_val int;
BEGIN
 FOR i IN1..char_length($1) LOOP
 ascii_val := ascii(substr($1, i, 1));
 IF (ascii_val >591
-- Vietnam
-- https://en.wikipedia.org/wiki/Latin_script_in_Unicode
-- https://en.wikipedia.org/wiki/Latin_Extended_Additional
AND ascii_val NOT BETWEEN x'1E00'::intAND x'1EFF'::int
-- https://en.wikipedia.org/wiki/Combining_character
AND ascii_val NOT BETWEEN x'0300'::intAND x'036F'::int

-- Azerbaijan
-- https://en.wikipedia.org/wiki/IPA_Extensions
AND ascii_val <> x'0259'::int
 ) THEN
 RETURN false;
 END IF;
 END LOOP;
 RETURN true;
 END;
$$ LANGUAGE 'plpgsql' IMMUTABLE;

CREATE OR REPLACEFUNCTIONget_latin_name(tags hstore, geometry geometry) RETURNS textAS $$
SELECT COALESCE(
 CASE
 WHEN tags->'name'is not nulland omt_is_latin(tags->'name')
 THEN tags->'name'
 ELSE NULL
 END,
 NULLIF(tags->'name:en', ''),
 NULLIF(tags->'int_name', ''),
 NULLIF(osml10n_get_name_without_brackets_from_tags(tags, 'en', geometry), '')
 );
$$ LANGUAGE SQL IMMUTABLE STRICT;


CREATE OR REPLACEFUNCTIONget_nonlatin_name(tags hstore) RETURNS textAS $$
SELECT
 CASE
 WHEN tags->'name'is not nulland omt_is_latin(tags->'name')
 THEN NULL
 WHEN unaccent(tags->'name') ~ '[a-zA-Z]'
 THEN remove_latin(tags->'name')
 ELSE tags->'name'
 END;
$$ LANGUAGE SQL IMMUTABLE STRICT;

CREATE OR REPLACEFUNCTIONget_basic_names(tags hstore, geometry geometry) RETURNS hstore AS $$
DECLARE
 tags_array text[] := ARRAY[]::text[];
 name_latin text;
 name_nonlatin text;
 name_int text;
BEGIN
 name_latin := get_latin_name(tags, geometry);
 name_nonlatin := get_nonlatin_name(tags);
 IF (name_nonlatin = name_latin) THEN
 name_nonlatin :=null;
 END IF;
 name_int := COALESCE(
 NULLIF(tags->'int_name', ''),
 NULLIF(tags->'name:en', ''),
 NULLIF(name_latin, ''),
 tags->'name'
 );
 IF name_latin IS NOT NULL THEN
 tags_array := tags_array || ARRAY['name:latin', name_latin];
 END IF;
 IF name_nonlatin IS NOT NULL THEN
 tags_array := tags_array || ARRAY['name:nonlatin', name_nonlatin];
 END IF;
 IF name_int IS NOT NULL THEN
 tags_array := tags_array || ARRAY['name_int', name_int];
 END IF;
 RETURN hstore(tags_array);
END;
$$ STRICT
LANGUAGE plpgsql IMMUTABLE;

CREATETABLEIF NOT EXISTS wd_names(id varchar(20), page varchar(200), labels hstore);

CREATE OR REPLACEFUNCTIONmerge_wiki_names(tags hstore) RETURNS hstore AS $$
DECLARE
 result hstore;
BEGIN

 IF (tags ? 'wikidata'OR tags ? 'wikipedia') THEN
select INTO result
 CASE
 WHEN avals(wd.labels) && avals(tags)
 THEN slice_language_tags(wd.labels) || tags
 ELSE tags
 END
FROM wd_names wd
WHEREwd.id= tags->'wikidata'ORwd.page= tags->'wikipedia';
 IF result IS NULL THEN
 result := tags;
 END IF;
 ELSE
 result := tags;
 END IF;

 RETURN result;
END;
$$ STRICT
LANGUAGE plpgsql IMMUTABLE;


CREATE OR REPLACEFUNCTIONupdate_tags(tags hstore, geometry
 geometry) RETURNS hstore AS $$
DECLARE
 result hstore;
BEGIN
 result := delete_empty_keys(tags) || get_basic_names(tags, geometry);
 result := merge_wiki_names(result);
 RETURN result;
END;
$$ STRICT
LANGUAGE plpgsql IMMUTABLE;