def __parse_literal(self, start_point_loc):
'''
Private function to parse a single LITERAL expression. The _file
variable should be in a state starting with (without quotes):
'<val>)'
That is, the '(lit ' section has alread been read.
Returns an instance of Literal()
'''
lit_val = self.__parse_word()
loc = start_point_loc.span(self.__get_point_loc())
# Convert the value to the correct type.
lit_type = Type.get_type_from_string_val(loc, lit_val)
lit_val = Type.convert_type(loc, lit_type, lit_val)
return Literal(loc, lit_type, lit_val)
