--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/python/c3/scope.py	Fri Mar 01 16:53:22 2013 +0100
@@ -0,0 +1,33 @@
+from . import astnodes
+
+class Scope:
+   """ A scope contains all symbols in a scope """
+   def __init__(self, parent=None):
+      self.symbols = {}
+      self.parent = parent
+   def __iter__(self):
+      return iter(self.symbols.values())
+   def getSymbol(self, name):
+      if name in self.symbols:
+         return self.symbols[name]
+      # Look for symbol:
+      if self.parent:
+         return self.parent.getSymbol(name)
+      raise CompilerException("Symbol {0} not found".format(name), name.loc)
+   def hasSymbol(self, name):
+      if name in self.symbols:
+         return True
+      if self.parent:
+         return self.parent.hasSymbol(name)
+      return False
+   def addSymbol(self, sym):
+      self.symbols[sym.name] = sym
+
+def createBuiltins(scope):
+   for tn in ['int', 'u32', 'u16', 'double']:
+      scope.addSymbol(astnodes.BaseType(tn))
+
+topScope = Scope()
+
+createBuiltins(topScope)
+