def add_definition(self, string):
term = self.parse(string)
assert qterm.is_combination(term)
assert qterm.is_combination(term.operator)
assert term.operator.operator.name == '='
assert qterm.is_variable(term.operator.operand) \
or qterm.is_constant(term.operator.operand)
name = term.operator.operand.name
self.definitions[name] = term
def beta_reduce(term):
if not qterm.is_combination(term):
return term
if qterm.is_abstraction(term.operator):
return substitute(term.operand, term.operator.bound, term.operator.body)
return term
def apply_to_term(self, term):
if qterm.is_atom(term):
return self.apply_to_atom(term)
elif qterm.is_combination(term):
return self.apply_to_combination(term)
elif qterm.is_abstraction(term):
return self.apply_to_abstraction(term)
else:
raise Exception('unrecognized term')
def uncurry(term):
if not qterm.is_combination(term):
return term, []
operator, operands = uncurry(term.operator)
return operator, operands + [term.operand]