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updated wikipedia article code to allow for mutliple languages and remove code duplication

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This commit is contained in:
Brian Quinion
2012-05-07 00:18:31 +01:00
parent cc43bedd21
commit b9a3e52a67
1 changed files with 68 additions and 50 deletions
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118
sql/functions.sql
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@@ -1225,9 +1225,7 @@ DECLARE
name_vector INTEGER[];
nameaddress_vector INTEGER[];
wiki_article TEXT;
wiki_article_title TEXT;
wiki_article_language TEXT;
linked_node_id BIGINT;
result BOOLEAN;
BEGIN
@@ -1313,31 +1311,9 @@ BEGIN
END LOOP;
NEW.importance := null;
-- WARNING: see duplicate of code below (yuk!)
IF NEW.extratags?'wikipedia' THEN
wiki_article := replace(regexp_replace(NEW.extratags->'wikipedia',E'(.*?)([a-z]+).wikipedia.org/wiki/',E'\\2:'),' ','_');
wiki_article_title := split_part(wiki_article, ':', 2);
IF wiki_article_title IS NULL OR wiki_article_title = '' THEN
wiki_article_title := wiki_article;
wiki_article_language := 'en';
ELSE
wiki_article_language := lower(split_part(wiki_article, ':', 1));
END IF;
--RAISE WARNING '% %', wiki_article_language, wiki_article_title;
select wikipedia_article.importance,wikipedia_article.language||':'||wikipedia_article.title
from wikipedia_article
where language = wiki_article_language and
(title = wiki_article_title OR title = catch_decode_url_part(wiki_article_title) OR title = replace(catch_decode_url_part(wiki_article_title),E'\\',''))
UNION ALL
select wikipedia_article.importance,wikipedia_article.language||':'||wikipedia_article.title
from wikipedia_redirect join wikipedia_article on (wikipedia_redirect.language = wikipedia_article.language and wikipedia_redirect.to_title = wikipedia_article.title)
where wikipedia_redirect.language = wiki_article_language and
(from_title = wiki_article_title OR from_title = catch_decode_url_part(wiki_article_title) OR from_title = replace(catch_decode_url_part(wiki_article_title),E'\\',''))
order by importance asc limit 1 INTO NEW.importance,NEW.wikipedia;
ELSE
select importance,language||':'||title from wikipedia_article where osm_type = NEW.osm_type and osm_id = NEW.osm_id order by importance asc limit 1 INTO NEW.importance,NEW.wikipedia;
select language||':'||title,importance from get_wikipedia_match(NEW.extratags) INTO NEW.wikipedia,NEW.importance;
IF NEW.importance IS NULL THEN
select language||':'||title,importance from wikipedia_article where osm_type = NEW.osm_type and osm_id = NEW.osm_id order by importance desc limit 1 INTO NEW.wikipedia,NEW.importance;
END IF;
--RAISE WARNING '% %', NEW.place_id, NEW.rank_search;
@@ -1560,6 +1536,9 @@ BEGIN
-- mark the linked place (excludes from search results)
UPDATE placex set linked_place_id = NEW.place_id where place_id = linkedPlacex.place_id;
-- keep a note of the node id in case we need it for wikipedia in a bit
linked_node_id := linkedPlacex.osm_id;
END IF;
END LOOP;
@@ -1592,6 +1571,8 @@ BEGIN
-- mark the linked place (excludes from search results)
UPDATE placex set linked_place_id = NEW.place_id where place_id = linkedPlacex.place_id;
-- keep a note of the node id in case we need it for wikipedia in a bit
linked_node_id := linkedPlacex.osm_id;
END LOOP;
END IF;
@@ -1600,28 +1581,12 @@ BEGIN
END IF;
-- Did we gain a wikipedia tag in the process? then we need to recalculate our importance
-- WARNING: duplicate of code above (yuk!)
IF NEW.importance is null AND NEW.extratags?'wikipedia' THEN
wiki_article := replace(regexp_replace(NEW.extratags->'wikipedia',E'(.*?)([a-z]+).wikipedia.org/wiki/',E'\\2:'),' ','_');
wiki_article_title := split_part(wiki_article, ':', 2);
IF wiki_article_title IS NULL OR wiki_article_title = '' THEN
wiki_article_title := wiki_article;
wiki_article_language := 'en';
ELSE
wiki_article_language := lower(split_part(wiki_article, ':', 1));
END IF;
select wikipedia_article.importance,wikipedia_article.language||':'||wikipedia_article.title
from wikipedia_article
where language = wiki_article_language and
(title = wiki_article_title OR title = catch_decode_url_part(wiki_article_title) OR title = replace(catch_decode_url_part(wiki_article_title),E'\\',''))
UNION ALL
select wikipedia_article.importance,wikipedia_article.language||':'||wikipedia_article.title
from wikipedia_redirect join wikipedia_article on (wikipedia_redirect.language = wikipedia_article.language and wikipedia_redirect.to_title = wikipedia_article.title)
where wikipedia_redirect.language = wiki_article_language and
(from_title = wiki_article_title OR from_title = catch_decode_url_part(wiki_article_title) OR from_title = replace(catch_decode_url_part(wiki_article_title),E'\\',''))
order by importance asc limit 1 INTO NEW.importance,NEW.wikipedia;
IF NEW.importance is null THEN
select language||':'||title,importance from get_wikipedia_match(NEW.extratags) INTO NEW.wikipedia,NEW.importance;
END IF;
-- Still null? how about looking it up by the node id
IF NEW.importance IS NULL THEN
select language||':'||title,importance from wikipedia_article where osm_type = 'N' and osm_id = linked_node_id order by importance desc limit 1 INTO NEW.wikipedia,NEW.importance;
END IF;
END IF;
@@ -2783,3 +2748,56 @@ EXCEPTION
END;
$$
LANGUAGE plpgsql IMMUTABLE;
DROP TYPE wikipedia_article_match CASCADE;
create type wikipedia_article_match as (
language TEXT,
title TEXT,
importance FLOAT
);
CREATE OR REPLACE FUNCTION get_wikipedia_match(extratags HSTORE) RETURNS wikipedia_article_match
AS $$
DECLARE
langs TEXT[];
i INT;
wiki_article TEXT;
wiki_article_title TEXT;
wiki_article_language TEXT;
result wikipedia_article_match;
BEGIN
langs := ARRAY['','ar','bg','ca','cs','da','de','en','es','eo','eu','fa','fr','ko','hi','hr','id','it','he','lt','hu','ms','nl','ja','no','pl','pt','kk','ro','ru','sk','sl','sr','fi','sv','tr','uk','vi','vo','war','zh'];
i := 1;
WHILE langs[i] IS NOT NULL LOOP
wiki_article := extratags->(case when langs[i] = '' THEN 'wikipedia' ELSE 'wikipedia:'||langs[i] END);
IF wiki_article is not null THEN
wiki_article := replace(regexp_replace(wiki_article,E'(.*?)([a-z]+).wikipedia.org/wiki/',E'\\2:'),' ','_');
wiki_article_title := split_part(wiki_article, ':', 2);
IF wiki_article_title IS NULL OR wiki_article_title = '' THEN
wiki_article_title := wiki_article;
wiki_article_language := CASE WHEN langs[i] = '' THEN 'en' ELSE langs[i] END;
ELSE
wiki_article_language := lower(split_part(wiki_article, ':', 1));
END IF;
select wikipedia_article.language,wikipedia_article.title,wikipedia_article.importance
from wikipedia_article
where language = wiki_article_language and
(title = wiki_article_title OR title = catch_decode_url_part(wiki_article_title) OR title = replace(catch_decode_url_part(wiki_article_title),E'\\',''))
UNION ALL
select wikipedia_article.language,wikipedia_article.title,wikipedia_article.importance
from wikipedia_redirect join wikipedia_article on (wikipedia_redirect.language = wikipedia_article.language and wikipedia_redirect.to_title = wikipedia_article.title)
where wikipedia_redirect.language = wiki_article_language and
(from_title = wiki_article_title OR from_title = catch_decode_url_part(wiki_article_title) OR from_title = replace(catch_decode_url_part(wiki_article_title),E'\\',''))
order by importance desc limit 1 INTO result;
IF result.language is not null THEN
return result;
END IF;
END IF;
i := i + 1;
END LOOP;
RETURN NULL;
END;
$$
LANGUAGE plpgsql;