From 7b1c6e0a9d7966522328770cb4ed7464b9c6a5a1 Mon Sep 17 00:00:00 2001
From: "W. Trevor King" <wking@tremily.us>
Date: Sun, 30 Jun 2013 15:03:03 -0400
Subject: [PATCH] entry: Die unless we're parsing a version 2.0 iCalendar

RFC 5545, section 3.7.4 (Version) describes this text field.  Until I
actually see something using using the (minver ";" maxver) syntax,
I'll just require everything to be version 2.0.
---
 pycalendar/entry.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/pycalendar/entry.py b/pycalendar/entry.py
index 4e5db9f..46bf3b6 100644
--- a/pycalendar/entry.py
+++ b/pycalendar/entry.py
@@ -146,6 +146,11 @@ class Entry (dict):
                     self._add_value(key=value, value=child, force_list=True)
                     child_lines = []
             elif not stack:  # our own data, not a child's
+                if key == 'VERSION':
+                    v = _text.unescape(value)
+                    if v != '2.0':
+                        raise NotImplementedError(
+                            'cannot parse VERSION {} feed'.format(v))
                 self._add_value(key=key, value=value)
 
     def _add_value(self, key, value, force_list=False):
-- 
2.26.2