fix(postgresql): support binary/octal/hex integer literals (#61)

Author: h3n4l

postgresql/PostgreSQLLexer.g4

@@ -2587,6 +2587,18 @@ Integral
    : Digits
    ;
 
+BinaryIntegral
+   : '0b' Digits
+   ;
+
+OctalIntegral
+   : '0o' Digits
+   ;
+
+HexadecimalIntegral
+   : '0x' Digits
+   ;
+
 NumericFail
    : Digits '..'
    {l.HandleNumericFail();}

postgresql/PostgreSQLParser.g4

@@ -4105,6 +4105,9 @@ fconst
 
 iconst
    : Integral
+   | BinaryIntegral
+   | OctalIntegral
+   | HexadecimalIntegral
    ;
 
 sconst

postgresql/examples/numeric.sql

@@ -1316,3 +1316,9 @@ SELECT pg_lsn(18446744073709551615::numeric);
 SELECT pg_lsn(-1::numeric);
 SELECT pg_lsn(18446744073709551616::numeric);
 SELECT pg_lsn('NaN'::numeric);
+
+--
+-- Tests for binary/octal/hex integer literals
+--
+SELECT abs(0b10), abs(0B10), abs(0x10), abs(0X10), abs(0o10), abs(0O10),
+       ('{1}'::int[])[0b01], 1::char(0o01), (array[1])[0x01];