<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def parse(self, text):
 """Parse the given text, return a list of Keywords."""

        token_stream = self.lexer.tokenize(text)
        return self.expr(token_stream, next(token_stream))