def read(self):
"""Match the grammar for a read."""
self.match("READ")
self.stack.append("Designator")
location = self.designator()
if not isinstance(location, Location) or location.type != self.integer_type:
# Not an integer variable.
try:
raise InvalidRead(location.type, self.last)
except InvalidRead as e:
self.invalid_token(e)
r = Read(location)
r.token = self.last
return r
