From 575fc75461a854f1fe468cb91a0332d0ffedc18d Mon Sep 17 00:00:00 2001
From: Arthur de Jong <arthur@arthurdejong.org>
Date: Sun, 5 Feb 2012 20:51:19 +0000
Subject: add a RČ (Rodné číslo, the Czech birth numbers) module
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

git-svn-id: http://arthurdejong.org/svn/python-stdnum/python-stdnum@101 9dea7c4f-944c-4273-ac1a-574ede026edc
---
 stdnum/cz/__init__.py |  0
 stdnum/cz/rc.py       | 97 +++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 97 insertions(+)
 create mode 100644 stdnum/cz/__init__.py
 create mode 100644 stdnum/cz/rc.py

(limited to 'stdnum/cz')

diff --git a/stdnum/cz/__init__.py b/stdnum/cz/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/stdnum/cz/rc.py b/stdnum/cz/rc.py
new file mode 100644
index 0000000..eccc8ca
--- /dev/null
+++ b/stdnum/cz/rc.py
@@ -0,0 +1,97 @@
+# rc.py - functions for handling Czech birth 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
+
+"""Module for handling Czech birth numbers (RČ, Rodné číslo), the Czech
+national identifier.
+
+>>> compact('710319/2745')
+'7103192745'
+>>> is_valid('7103192745')
+True
+>>> is_valid('991231123')
+True
+>>> is_valid('7103192746')  # invalid check digit
+False
+>>> is_valid('1103492745')  # invalid date
+False
+>>> is_valid('590312/123')  # 9 digit number in 1959
+False
+>>> format('7103192745')
+'710319/2745'
+"""
+
+import datetime
+
+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."""
+    return clean(number, ' /').upper().strip()
+
+
+def _get_birth_date(number):
+    """Split the date parts from the number and return the birth date."""
+    year = 1900 + int(number[0:2])
+    # females have 50 added to the month value, 20 is added when the serial
+    # overflows (since 2004)
+    month = int(number[2:4]) % 50 % 20
+    day = int(number[4:6])
+    # 9 digit numbers were used until January 1st 1954
+    if len(number) == 9:
+        if year >= 1980:
+            year -= 100
+        if year > 1953:
+            raise ValueError('No 9 digit birth numbers after 1953.')
+    elif year < 1954:
+        year += 100
+    return datetime.date(year, month, day)
+
+
+def is_valid(number):
+    """Checks to see if the number provided is a valid birth number. This
+    checks the length, formatting, embedded date and check digit."""
+    try:
+        number = compact(number)
+    except:
+        return False
+    if not number.isdigit() or len(number) not in (9, 10):
+        return False
+    # check if birth date is valid
+    try:
+        birth_date = _get_birth_date(number)
+        # TODO: check that the birth date is not in the future
+    except ValueError, e:
+        return False
+    # check the check digit
+    if len(number) == 10:
+        check = int(number[:-1]) % 11
+        # before 1985 the checksum could be 0 or 10
+        if birth_date < datetime.date(1985, 1, 1):
+            check = check % 10
+        return number[-1] == str(check)
+    return True
+
+
+def format(number):
+    """Reformat the passed number to the standard format."""
+    number = compact(number)
+    return number[:6] + '/' + number[6:]
-- 
cgit v1.2.3