def fv(self, kind, env):
if env.isBoundVar(self):
return Concat(None)
def simpleType(x):
if isinstance(x, Id):
return x.symbol
if isinstance(x, List):
return simpleType(x.arg)
return None
if kind in map(lambda x: simpleType(x), env.boundVars(self)):
result = SetSub(None)
result.lhs = FV(kind, self, None)
result.rhs = Concat(None)
result.rhs.elements = set(env.boundVars(self))
return result
if kind not in self.symbol.deepVars():
return Concat(None)
if self.symbol == kind:
return self
return FV(kind, self, None)
def fv(self, kind, env):
if env.isBoundVar(self):
return Concat(None)
def simpleType(x):
if isinstance(x, Id):
return x.symbol
if isinstance(x, List):
return simpleType(x.arg)
return None
if kind in map(lambda x: simpleType(x), env.boundVars(self)):
result = SetSub(None)
result.lhs = FV(kind, self, None)
result.rhs = Concat(None)
result.rhs.elements = set(env.boundVars(self))
return result
if kind not in self.symbol.deepVars():
return Concat(None)
if self.symbol == kind:
return self
return FV(kind, self, None)
def subst(self, new, old, env, symbols):
if env.isBoundVar(self):
return self
if env.provesIn(old, env.boundVars(self)):
return self
if env.provesEq(self, old):
return new
sym = old
if isinstance(old, Id):
sym = old.symbol
if self.symbol == sym and env.provesNE(self, old):
return self
if not env.provesIn(sym, self.symbol.deepVars()):
return self
result = Subst(None)
result.body = self
result.lhs = new
result.rhs = old
return result
def subst(self, new, old, env, symbols):
if env.isBoundVar(self):
return self
if env.provesIn(old, env.boundVars(self)):
return self
if env.provesEq(self, old):
return new
sym = old
if isinstance(old, Id):
sym = old.symbol
if self.symbol == sym and env.provesNE(self, old):
return self
if not env.provesIn(sym, self.symbol.deepVars()):
return self
result = Subst(None)
result.body = self
result.lhs = new
result.rhs = old
return result
