Add Pakistani ID card number

Based on the implementation provided by Quantum Novice (Syed Haseeb
Shah).

Closes arthurdejong#306
Closes arthurdejong#304

stdnum/pk/__init__.py

@@ -0,0 +1,21 @@
+# __init__.py - collection of Pakistani numbers
+# coding: utf-8
+#
+# Copyright (C) 2022 Arthur de Jong
+#
+# 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
+
+"""Collection of Pakistani numbers."""

stdnum/pk/cnic.py

@@ -0,0 +1,112 @@
+# cnic.py - functions for handling Pakistani CNIC numbers
+# coding: utf-8
+#
+# Copyright (C) 2022 Syed Haseeb Shah
+# Copyright (C) 2022 Arthur de Jong
+#
+# 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
+
+"""CNIC number (Pakistani Computerised National Identity Card number).
+
+The CNIC (Computerised National Identity Card, قومی شناختی کارڈ) or SNIC
+(Smart National Identity Card) is issued by by Pakistan's NADRA (National
+Database and Registration Authority) to citizens of 18 years or older.
+
+The number consists of 13 digits and encodes the person's locality (5
+digits), followed by 7 digit serial number an a single digit indicating
+gender.
+
+More Information:
+
+* https://en.wikipedia.org/wiki/CNIC_(Pakistan)
+* https://www.nadra.gov.pk/identity/identity-cnic/
+
+>>> validate('34201-0891231-8')
+'3420108912318'
+>>> validate('42201-0397640-8')
+'4220103976408'
+>>> get_gender('42201-0397640-8')
+'F'
+>>> get_province('42201-0397640-8')
+'Sindh'
+>>> format('3420108912318')
+'34201-0891231-8'
+"""
+
+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 get_gender(number):
+    """Get the person's birth gender ('M' or 'F')."""
+    number = compact(number)
+    if number[-1] in '13579':
+        return 'M'
+    elif number[-1] in '2468':
+        return 'F'
+
+
+# Valid Province IDs
+PROVINCES = {
+    '1': 'Khyber Pakhtunkhwa',
+    '2': 'FATA',
+    '3': 'Punjab',
+    '4': 'Sindh',
+    '5': 'Balochistan',
+    '6': 'Islamabad',
+    '7': 'Gilgit-Baltistan',
+}
+
+
+def get_province(number):
+    """Get the person's birth gender ('M' or 'F')."""
+    number = compact(number)
+    return PROVINCES.get(number[0])
+
+
+def validate(number):
+    """Check if the number is a valid CNIC. This checks the length, formatting
+    and some digits."""
+    number = compact(number)
+    if not isdigits(number):
+        raise InvalidFormat()
+    if len(number) != 13:
+        raise InvalidLength()
+    if not get_gender(number):
+        raise InvalidComponent()
+    if not get_province(number):
+        raise InvalidComponent()
+    return number
+
+
+def is_valid(number):
+    """Check if the number is a valid CNIC."""
+    try:
+        return bool(validate(number))
+    except ValidationError:
+        return False
+
+
+def format(number):
+    """Reformat the number to the standard presentation format."""
+    number = compact(number)
+    return '-'.join((number[:5], number[5:12], number[12:]))

tests/test_pk_cnic.doctest

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+test_pk_cnic.doctest - more detailed doctests for stdnum.pk.cnic
+
+Copyright (C) 2022 Arthur de Jong
+
+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
+
+
+This file contains more detailed doctests for the stdnum.pk.cnic module.
+
+>>> from stdnum.pk import cnic
+
+
+>>> cnic.validate('34201-0891231-8')
+'3420108912318'
+>>> cnic.validate('34201-0891231-0')  # invalid gender
+Traceback (most recent call last):
+    ...
+InvalidComponent: ...
+>>> cnic.validate('94201-0891231-8')  # invalid province
+Traceback (most recent call last):
+    ...
+InvalidComponent: ...
+
+>>> cnic.get_gender('34201-0891231-8')
+'F'
+>>> cnic.get_gender('34201-0891231-9')
+'M'