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', 'void']:
      scope.addSymbol(astnodes.BaseType(tn))

topScope = Scope()
createBuiltins(topScope)