纯ruby语法分析器提供了改变这种情况的机会——Ruby IDE(或者其他工具)可以获得Ruby的抽象语法树，同时避免被绑定到特定的语法分析器实现上。

The pure Ruby parser now offers a chance to change that - a Ruby IDE or other tool, can now get at a Ruby AST without getting locked in.

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语法分析器读取这棵树，并通过事件为应用程序描述它。

The parser reads the tree and describes it, through events, to your application.

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所有这些分析器提供了不同的抽象语法树以及获取它们的方式。

All of these provide different ASTs and different ways of getting at it.

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