你看看地图就会明白沙特的窒息感：
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You can think of each rule ('Value', 'Object', etc.) as being like a function, and the function bodies are parsing expressions. Alt, Apply, Opt, Seq, and Term are all subclasses of the abstract PExpr class, and they all have an eval method. These methods are mostly pretty small and straightforward — here's the implementation for Alt:
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