Basic static/moving circle collisions. (Fixes issue #5)

[python-bulletml.git] / bulletml / parser.py

diff --git a/bulletml/parser.py b/bulletml/parser.py
index 86dfe3c..5435925 100644 (file)
--- a/bulletml/parser.py
+++ b/bulletml/parser.py
@@ -13,6 +13,12 @@ import math
 
 from xml.etree.ElementTree import ElementTree
 
+# Python 3 moved this for no really good reason.
+try:
+    from sys import intern
+except ImportError:
+    pass
+
 try:
     from io import StringIO
 except ImportError:
@@ -64,7 +70,7 @@ class Direction(object):
     def __init__(self, type, value):
         if type not in self.VALID_TYPES:
             raise ValueError("invalid type %r" % type)
-        self.type = type
+        self.type = intern(type)
         self.value = value
 
     def __getstate__(self):
@@ -132,7 +138,7 @@ class Speed(object):
     def __init__(self, type, value):
         if type not in self.VALID_TYPES:
             raise ValueError("invalid type %r" % type)
-        self.type = type
+        self.type = intern(type)
         self.value = value
 
     def __getstate__(self):
@@ -355,9 +361,6 @@ class Accel(object):
 class BulletDef(object):
     """Bullet definition."""
 
-    direction = None
-    speed = None
-
     def __init__(self, actions=(), direction=None, speed=None, tags=()):
         self.direction = direction
         self.speed = speed
@@ -537,7 +540,7 @@ class Offset(object):
     def __init__(self, type, x, y):
         if type not in self.VALID_TYPES:
             raise ValueError("invalid type %r" % type)
-        self.type = type
+        self.type = intern(type)
         self.x = x
         self.y = y
 
@@ -551,7 +554,9 @@ class Offset(object):
 
     def __setstate__(self, state):
         state = dict(state)
-        self.__init__(state["type"], state.get("x"), state.get("y"))
+        x = NumberDef(state["x"]) if "x" in state else None
+        y = NumberDef(state["y"]) if "y" in state else None
+        self.__init__(state["type"], x, y)
 
     @classmethod
     def FromXML(cls, doc, element):
@@ -706,7 +711,7 @@ class BulletML(object):
         )
 
     def __init__(self, type="none", actions=None):
-        self.type = type
+        self.type = intern(type)
         self.actions = [] if actions is None else actions
 
     def __getstate__(self):