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create table bit_op (
b0 bit(8), b1 bit(8), band bit(8), bor bit(8),
bxor bit(8), bnot0 bit(8), bnot1 bit(8)
);
create function bt(integer, integer) returns bit_op as '
b0 = BitString.new(args[0], 8)
b1 = BitString.new(args[1], 8)
[b0, b1, b0 & b1, b0 | b1, b0 ^ b1, ~b0, ~b1]
' language 'plruby';
select * from bt(12, 24);
b0 | b1 | band | bor | bxor | bnot0 | bnot1
----------+----------+----------+----------+----------+----------+----------
00001100 | 00011000 | 00001000 | 00011100 | 00010100 | 11110011 | 11100111
(1 row)
select * from bt(12, 32);
b0 | b1 | band | bor | bxor | bnot0 | bnot1
----------+----------+----------+----------+----------+----------+----------
00001100 | 00100000 | 00000000 | 00101100 | 00101100 | 11110011 | 11011111
(1 row)
select * from bt(15, 278);
b0 | b1 | band | bor | bxor | bnot0 | bnot1
----------+----------+----------+----------+----------+----------+----------
00001111 | 00010110 | 00000110 | 00011111 | 00011001 | 11110000 | 11101001
(1 row)
create function be(integer) returns setof integer as '
BitString.new(args[0], 8).each {|i| yield i}
' language 'plruby';
select * from be(12);
be
----
0
0
0
0
1
1
0
0
(8 rows)
select * from be(257);
be
----
0
0
0
0
0
0
0
1
(8 rows)
create function bx(integer, integer) returns bit varying as '
BitString.new(*args)
' language 'plruby';
select bx(12, 6);
bx
--------
001100
(1 row)
select bx(12, 8);
bx
----------
00001100
(1 row)
create table bit_sht (
b0 bit(8), shft int, bl bit(8), br bit(8), bs text, bi integer,
sz integer, osz integer
);
create function bs(integer, integer) returns bit_sht as '
b0 = BitString.new(args[0], 8)
[b0, args[1], b0 << args[1], b0 >> args[1], b0.to_s, b0.to_i,
b0.size, b0.octet_size]
' language 'plruby';
select * from bs(12, 2);
b0 | shft | bl | br | bs | bi | sz | osz
----------+------+----------+----------+----------+----+----+-----
00001100 | 2 | 00110000 | 00000011 | 00001100 | 12 | 8 | 1
(1 row)
select * from bs(277, -3);
b0 | shft | bl | br | bs | bi | sz | osz
----------+------+----------+----------+----------+----+----+-----
00010101 | -3 | 00000010 | 10101000 | 00010101 | 21 | 8 | 1
(1 row)
create function ext(text, integer) returns integer as '
b0 = BitString.new(args[0])
b0[args[1]]
' language 'plruby';
select ext('011110', 0);
ext
-----
0
(1 row)
select ext('011110', -1);
ext
-----
0
(1 row)
select ext('011110', 1);
ext
-----
1
(1 row)
select ext('011110', 4);
ext
-----
1
(1 row)
create function ext2(text, integer, integer) returns bit varying(8) as '
b0 = BitString.new(args[0])
b0[args[1], args[2]]
' language 'plruby';
select ext2('0111101', 0, 2);
ext2
------
01
(1 row)
select ext2('0111101', -1, 3);
ext2
------
1
(1 row)
select ext2('0111101', 1, 2);
ext2
------
11
(1 row)
select ext2('0111101', 4, 1);
ext2
------
1
(1 row)
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