+ langs TEXT[];
+ i INT;
+ wiki_article TEXT;
+ wiki_article_title TEXT;
+ wiki_article_language TEXT;
+ result wikipedia_article_match;
+BEGIN
+ langs := ARRAY['english','country','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] in ('english','country') THEN 'wikipedia' ELSE 'wikipedia:'||langs[i] END);
+ IF wiki_article is not null THEN
+ wiki_article := regexp_replace(wiki_article,E'^(.*?)([a-z]{2,3}).wikipedia.org/wiki/',E'\\2:');
+ wiki_article := regexp_replace(wiki_article,E'^(.*?)([a-z]{2,3}).wikipedia.org/w/index.php\\?title=',E'\\2:');
+ wiki_article := regexp_replace(wiki_article,E'^(.*?)/([a-z]{2,3})/wiki/',E'\\2:');
+ --wiki_article := regexp_replace(wiki_article,E'^(.*?)([a-z]{2,3})[=:]',E'\\2:');
+ wiki_article := replace(wiki_article,' ','_');
+ IF strpos(wiki_article, ':') IN (3,4) THEN
+ wiki_article_language := lower(trim(split_part(wiki_article, ':', 1)));
+ wiki_article_title := trim(substr(wiki_article, strpos(wiki_article, ':')+1));
+ ELSE
+ wiki_article_title := trim(wiki_article);
+ wiki_article_language := CASE WHEN langs[i] = 'english' THEN 'en' WHEN langs[i] = 'country' THEN get_country_language_code(country_code) ELSE langs[i] END;
+ 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;