Add malaysian itn number

Author: Sergi Almacellas Abellana

stdnum/my/itn.py

@@ -0,0 +1,91 @@
+# itn.py - functions for handling ITN numbers
+#
+# Copyright (C) 2020 Sergi Almacellas Abellana
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+# 02110-1301 USA
+
+"""ITN No. (Malaysian Income Tax Number)
+
+The number is assigned by The Inland Revenue Board of Malaysia (IRBM) and it
+is required to report the income. This unique number is known as
+"Nombor CukaiPendapatan" or Income Tax Number.
+
+The number consist of 11 or 12 digits. It is structured by two types, normally
+separated by an space. The first one consists of 1 or 2 leters and represents
+the type of the file number. The second one is always ten digits an represents
+the tax number.
+
+>>> validate('C2584563202')
+'C2584563202'
+>>> validate('CDB2584563202')  # Should contain the prefix
+Traceback (most recent call last):
+    ...
+InvalidLength: ...
+>>> validate('CD12346789012')  # Should contain the prefix
+Traceback (most recent call last):
+    ...
+InvalidLength: ...
+>>> validate('C258456320B')  # number should only contain digits
+Traceback (most recent call last):
+    ...
+InvalidFormat: ...
+>>> format('C2584563202')
+'C 2584563202'
+"""
+
+from stdnum.exceptions import *
+from stdnum.util import clean, isdigits
+
+
+def compact(number):
+    """Convert the number to the minimal representation. This strips the
+    number of any valid separators and removes surrounding whitespace."""
+    return clean(number, ' -*').strip()
+
+
+def split(number):
+    number = compact(number)
+    index = 10
+    if len(number) > 12:
+        index += 11
+    return number[:-index], number[-index:]
+
+
+def validate(number):
+    """Check if the number is a valid NRIC number. This checks the length,
+    formatting and birth date and place."""
+    number = compact(number)
+    if len(number) > 13 or len(number) <= 10:
+        raise InvalidLength()
+    prefix, digits = split(number)
+    if not prefix or len(prefix) > 2:
+        raise InvalidLength()
+    if not isdigits(digits):
+        raise InvalidFormat()
+    return number
+
+
+def is_valid(number):
+    """Check if the number is a valid NRIC number."""
+    try:
+        return bool(validate(number))
+    except ValidationError:
+        return False
+
+
+def format(number):
+    """Reformat the number to the standard presentation format."""
+    return ' '.join(split(number))