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Shared/lib/python3.4/site-packages/stdnum/lt/__init__.py

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+# __init__.py - collection of Lithuanian numbers
+# coding: utf-8
+#
+# Copyright (C) 2012 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 Lithuanian numbers."""
+
+# provide vat as an alias
+from stdnum.lt import pvm as vat

Shared/lib/python3.4/site-packages/stdnum/lt/pvm.py

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+# pvm.py - functions for handling Lithuanian VAT numbers
+# coding: utf-8
+#
+# Copyright (C) 2012, 2013 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
+
+"""PVM (Pridėtinės vertės mokestis mokėtojo kodas, Lithuanian VAT number).
+
+The PVM is used for VAT purposes in Lithuania. It is 9 digits (for legal
+entities) or 12 digits long (for temporarily registered taxpayers). This
+module does not check the format of Lithuanian personal codes (Asmens
+kodas).
+
+>>> validate('119511515')  # organisation
+'119511515'
+>>> validate('LT 100001919017')  # temporarily registered
+'100001919017'
+>>> validate('100001919018')  # invalid check digit
+Traceback (most recent call last):
+    ...
+InvalidChecksum: ...
+>>> validate('100004801610')  # second step in check digit calculation
+'100004801610'
+"""
+
+from stdnum.exceptions import *
+from stdnum.util import clean
+
+
+def compact(number):
+    """Convert the number to the minimal representation. This strips the
+    number of any valid separators and removes surrounding whitespace."""
+    number = clean(number, ' -').upper().strip()
+    if number.startswith('LT'):
+        number = number[2:]
+    return number
+
+
+def calc_check_digit(number):
+    """Calculate the check digit. The number passed should not have the
+    check digit included."""
+    check = sum((1 + i % 9) * int(n) for i, n in enumerate(number)) % 11
+    if check == 10:
+        check = sum((1 + (i + 2) % 9) * int(n) for i, n in enumerate(number))
+    return str(check % 11 % 10)
+
+
+def validate(number):
+    """Checks to see if the number provided is a valid VAT number. This
+    checks the length, formatting and check digit."""
+    number = compact(number)
+    if not number.isdigit():
+        raise InvalidFormat()
+    if len(number) == 9:
+        # legal entities
+        if number[7] != '1':
+            raise InvalidComponent()
+    elif len(number) == 12:
+        # temporary tax payers and natural persons
+        if number[10] != '1':
+            raise InvalidComponent()
+    else:
+        raise InvalidLength()
+    if calc_check_digit(number[:-1]) != number[-1]:
+        raise InvalidChecksum()
+    return number
+
+
+def is_valid(number):
+    """Checks to see if the number provided is a valid VAT number. This
+    checks the length, formatting and check digit."""
+    try:
+        return bool(validate(number))
+    except ValidationError:
+        return False