def __init__(self):
"""Expression type is somewhat of an C++/Java abstract type,
__init__ must only be called by a subclass.
Sets _needs_parens to False. User may set it
to true in a subclass to add a parenthesis expression"""
self._needs_parens = False
Traversable.__init__(self)
def setChild(self, which, t):
"""Overrides Traversable's setChild to
enforce the rule that a child of an Expression must be
type Expression"""
if isinstance(t, Expression):
Traversable.setChild(self, which, t)
else:
raise ChildNotAnExpressionError(str(type(t)))
return self
def __init__(self):
"""Initializes SymbolTable with a new dict type"""
self.currSyms = {}
Traversable.__init__(self)
def setParent(self, t):
"""Overrides the setParent in Traversable to
catch unsupported parent node"""
self._catchParentNotCorrectType(t)
Traversable.setParent(self, t)
def removeChild(self, t):
"""Overrides the Traversable removeChild to
catch unsupported referenced nodes"""
self._catchChildNotCorrectType(t)
Traversable.removeChild(self, t)
def setChild(self, which, t):
"""Overrides the Traversable setChild to catch
unsupported child nodes"""
self._catchChildNotCorrectType(t)
Traversable.setChild(self, which, t)
def __init__(self, size=1):
Traversable.__init__(self)
self.setNumChildren(size)
"""Returns a dict representing the contents of
this Expression object and its base classes
instances' contents. Uses the items() function.
Contents added here is _needs_parens, by calling
'items' function"""
return dict(self.items())
def __setstate__(self, statedict):
"""Blindly calls setattr with entried from hir.
__getstate__ like string->attr dict"""
for k, v in list(statedict.items()):
setattr(self, k, v)
if __name__ == '__main__':
exp = Expression()
# exp.testIfNoChild()
# exp.testIfNoParent()
tra = Traversable()
exp.setParens(True)
exp.setParent(tra)
exp.setNumChildren(2)
chi1 = Expression()
chi2 = Expression()
exp.setChild(0, chi1)
exp.setChild(1, chi2)
# exp.getChild(100)
# exp.setChild(1,1)
# exp.setChild(100,chi1)
print((repr(exp)))
# exp.setParent(1)
def __init__(self):
Traversable.__init__(self)
def __init__(self):
Traversable.__init__(self)
self.setNumChildren(0)