From 323ac9257fa0f8d426da5052e4098b5537512c31 Mon Sep 17 00:00:00 2001
From: Doug Blank <doug.blank@gmail.com>
Date: Sat, 27 Dec 2008 21:31:16 +0000
Subject: [PATCH] Added len to Span class, and added an is_valid method to
 date. is_valid similar to is_regular, but allows partial dates

svn: r11528
---
 src/gen/lib/date.py | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/gen/lib/date.py b/src/gen/lib/date.py
index 8ea68b93c..564a0ef4b 100644
--- a/src/gen/lib/date.py
+++ b/src/gen/lib/date.py
@@ -111,6 +111,9 @@ class Span:
             return False
         return self.diff_tuple > other.diff_tuple
 
+    def __len__(self):
+        return len(self.diff_tuple)
+
 
 #-------------------------------------------------------------------------
 #
@@ -904,6 +907,12 @@ class Date:
         """
         return self.modifier != Date.MOD_TEXTONLY
 
+    def is_valid(self):
+        """ 
+        Return true if any part of the date is valid.
+        """
+        return self.modifier != Date.MOD_TEXTONLY and self.sortval != 0
+
     def get_stop_year(self):
         """
         Return the day of the year associated with the second part of a