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Shared/lib/python3.4/site-packages/stdnum/isil.py

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+# isil.py - functions for handling identifiers for libraries and related
+#           organizations
+#
+# Copyright (C) 2011, 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
+
+"""ISIL (International Standard Identifier for Libraries).
+
+The ISIL is the International Standard Identifier for
+Libraries and Related Organizations.
+
+>>> validate('IT-RM0267')
+'IT-RM0267'
+>>> validate('OCLC-DLC')
+'OCLC-DLC'
+>>> validate('WW-RM0267')  # unregistered country code
+Traceback (most recent call last):
+    ...
+InvalidComponent: ...
+>>> validate('WW-RM026712423345334534512334534545')  # too long
+Traceback (most recent call last):
+    ...
+InvalidLength: ...
+>>> format('it-RM0267')
+'IT-RM0267'
+"""
+
+from stdnum.exceptions import *
+from stdnum.util import clean
+
+
+# the valid characters in an ISIL
+_alphabet = set('0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-:/')
+
+
+def compact(number):
+    """Convert the ISIL to the minimal representation. This strips
+    surrounding whitespace."""
+    return clean(number, '').strip()
+
+
+def _known_agency(agency):
+    """Checks whether the specified agency is valid."""
+    # look it up in the db
+    from stdnum import numdb
+    results = numdb.get('isil').info(agency.upper() + '$')
+    # there should be only one part and it should have properties
+    return len(results) == 1 and bool(results[0][1])
+
+
+def validate(number):
+    """Checks to see if the number provided is a valid isil (or isilSV)
+    number."""
+    number = compact(number)
+    for n in number:
+        if n not in _alphabet:
+            raise InvalidFormat()
+    if len(number) > 15:
+        raise InvalidLength()
+    if not _known_agency(number.split('-')[0]):
+        raise InvalidComponent()
+    return number
+
+
+def is_valid(number):
+    """Checks to see if the number provided is a valid isil (or isilSV)
+    number."""
+    try:
+        return bool(validate(number))
+    except ValidationError:
+        return False
+
+
+def format(number):
+    """Reformat the passed number to the standard format."""
+    number = compact(number)
+    parts = number.split('-')
+    if len(parts) > 1 and _known_agency(parts[0]):
+        parts[0] = parts[0].upper()
+    return '-'.join(parts)