YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
词法分析器的⼯工作⽅方式<br />
(与语法分析器协同⼯工作)<br />
被调用时,不断读入余下的输入<br />
直到发现最长的、与某个模式匹配的前缀,调用相应<br />
的动作;<br />
该动作进行相关处理,并把控制返回;<br />
如果不返回,则词法分析器继续寻找其它词素
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