接下来，使用Xpand解析语法并将其转换为基于HashMap的数据结构。

Xpand was then used to parse and translate the grammar into a HashMap-based data structure.

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先从学习如何使用它的语法解析功能开始。

You'll start by learning how to use its syntax parsing abilities.

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这就意味着，如果 yacc 在知道采取哪个动作之前，必须读取两个标记，那么它将无法解析该语法。

This means that if yacc would have to read two tokens before it knew which action to take, it would be unable to parse this grammar.

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