Intern type strings for faster comparison during action running.

diff --git a/bulletml/parser.py b/bulletml/parser.py
index 86dfe3c8700c771728cfcdab60ff92953c6a278e..9d515a24b9e476343a9d829b1492454095850559 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):
@@ -537,7 +543,7 @@ 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
 
@@ -706,7 +712,7 @@ 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):