我正在明天修订考试,并在往年进行。
在测试中,是图表。
Expression -> Foo "+" Bar "end"
Foo -> [a-z0-9]+ | Expression
Bar -> Expression Foo | a*b*c+
我已经尝试并花了几个小时时间研究如何做,但可以说出。
我看着用ep子来替代东西,但并不感到有信心。
我认为,我需要建立一个oo和一个酒吧,然后在化sil规则中加入,但我不相信。
请允许我(简略地)介绍一下我——如何将其改为能够读书的L(1)。
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