blob: 78cb4eb8eb347594332c39cb82d978a242ccd439 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
--
-- Perl Weekly Challenge 254
-- Task 2
-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-254>
--
CREATE SCHEMA IF NOT EXISTS pwc254;
CREATE OR REPLACE FUNCTION
pwc254.task2_plpgsql( word text )
RETURNS text
AS $CODE$
DECLARE
output_string text := '';
current_vowel char;
current_index int;
remaining_vowels int;
letter char;
BEGIN
CREATE TEMPORARY TABLE IF NOT EXISTS vowels( v char, i serial );
TRUNCATE vowels;
INSERT INTO vowels( v )
SELECT v
FROM regexp_split_to_table( lower( word ), '' ) v
WHERE v IN ( 'a', 'e', 'i', 'o', 'u' );
FOR letter IN SELECT v FROM regexp_split_to_table( lower( word ), '' ) v LOOP
SELECT count( * )
FROM vowels
INTO remaining_vowels;
IF letter NOT IN ('a', 'e', 'i', 'o', 'u' ) OR remaining_vowels = 0 THEN
output_string := output_string || letter;
ELSE
SELECT v, i
INTO current_vowel, current_index
FROM vowels
ORDER BY i DESC;
output_string := output_string || current_vowel;
DELETE FROM vowels WHERE i = current_index;
END IF;
END LOOP;
RETURN output_string;
END
$CODE$
LANGUAGE plpgsql;
|
