when comparing ASN.1 types, by-tag and/or by-constraints matching

can now be performed with the isSuperTypeOf()/isSameTypeWith() optional
flags

2 files changed, 14 insertions, 6 deletions

diff --git a/CHANGES b/CHANGES
index a5f8267..083d729 100644
--- a/CHANGES
+++ b/CHANGES
@@ -15,6 +15,9 @@ Revision 0.1.8
   made public.
 - The base.NoValue() class instances now support __repr__() what makes
   possible to perform repr() on uninitialized pyasn1 types objects.
+- When comparing ASN.1 types, by-tag and/or by-constraints matching
+  can now be performed with the isSuperTypeOf()/isSameTypeWith() optional
+  flags.
 - Fix to NamedType.__repr__() to work properly.
 - Fixes to __repr__() implementation of many built-in ASN.1 types to take into
   account all of their initializers such as tagSet, subtypeSpec etc.
diff --git a/pyasn1/type/base.py b/pyasn1/type/base.py
index 7d3445c..2380fb0 100644
--- a/pyasn1/type/base.py
+++ b/pyasn1/type/base.py
@@ -38,14 +38,19 @@ class Asn1ItemBase(Asn1Item):
     def getEffectiveTagSet(self): return self._tagSet  # used by untagged types
     def getTagMap(self): return tagmap.TagMap({self._tagSet: self})
     
-    def isSameTypeWith(self, other):
+    def isSameTypeWith(self, other, ignoreTags=False, ignoreConstraints=False):
         return self is other or \
-               self._tagSet == other.getTagSet() and \
-               self._subtypeSpec == other.getSubtypeSpec()
-    def isSuperTypeOf(self, other):
+               (ignoreTags or \
+                self._tagSet == other.getTagSet()) and \
+               (ignoreConstraints or \
+                self._subtypeSpec==other.getSubtypeSpec())
+
+    def isSuperTypeOf(self, other, ignoreTags=False, ignoreConstraints=False):
         """Returns true if argument is a ASN1 subtype of ourselves"""
-        return self._tagSet.isSuperTagSetOf(other.getTagSet()) and \
-               self._subtypeSpec.isSuperTypeOf(other.getSubtypeSpec())
+        return (ignoreTags or  \
+                self._tagSet.isSuperTagSetOf(other.getTagSet())) and \
+               (ignoreConstraints or \
+                (self._subtypeSpec.isSuperTypeOf(other.getSubtypeSpec())))
 
 class NoValue:
     def __getattr__(self, attr):