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Shared/lib/python3.4/site-packages/stdnum/us/ein.py

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+# ein.py - functions for handling EINs
+#
+# Copyright (C) 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
+
+"""EIN (U.S. Employer Identification Number).
+
+The Employer Identification Number, also known as Federal Employer
+Identification Number (FEIN), is used to identify a business entity in the
+United States. It is issued to anyone that has to pay withholding taxes on
+employees.
+
+>>> validate('91-1144442')
+'911144442'
+>>> get_campus('04-2103594') == 'Brookhaven'
+True
+>>> validate('911-14-4442')  # dash in the wrong place
+Traceback (most recent call last):
+    ...
+InvalidFormat: ...
+>>> validate('07-1144442')  # wrong prefix
+Traceback (most recent call last):
+    ...
+InvalidComponent: ...
+>>> format('042103594')
+'04-2103594'
+"""
+
+import re
+
+from stdnum.exceptions import *
+from stdnum.util import clean
+
+
+# regular expression for matching EINs
+_ein_re = re.compile('^(?P<area>[0-9]{2})-?(?P<group>[0-9]{7})$')
+
+
+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_campus(number):
+    """Determine the Campus or other location that issued the EIN."""
+    from stdnum import numdb
+    number = compact(number)
+    results = numdb.get('us/ein').info(number)[0][1]
+    if not results:
+        raise InvalidComponent()
+    return results['campus']
+
+
+def validate(number):
+    """Checks to see if the number provided is a valid EIN. This checks
+    the length, groups and formatting if it is present."""
+    match = _ein_re.search(clean(number, '').strip())
+    if not match:
+        raise InvalidFormat()
+    get_campus(number)  # raises exception for unknown campus
+    return compact(number)
+
+
+def is_valid(number):
+    """Checks to see if the number provided is a valid EIN. This checks
+    the length, groups and formatting if it is present."""
+    try:
+        return bool(validate(number))
+    except ValidationError:
+        return False
+
+
+def format(number):
+    """Reformat the passed number to the standard format."""
+    if len(number) == 9:
+        number = number[:2] + '-' + number[2:]
+    return number