如何从YACC的AST？ [英] How to get the AST from YACC?

问题描述

我知道如何使YACC产生AST，但你如何actaully怎么做呢？我的意思是，你怎么actaully从YACC得到根节点的价值？

I know how to make YACC generate an AST, but how do you actaully get it? I mean, how do you actaully get the value of the root node from YACC?

推荐答案

Yacc的只给你一次背一个节点，它的的总是的东西，你只是在一些较早的时间给了YACC，即，无论你想从任何你想从一个终结符返回减产或退货。 （对不起，你说你知道，但有些人读这可能不是。）

Yacc only gives you back one node at a time, and it's always something that you just gave yacc at some earlier time, i.e., whatever you wanted to return from a reduced production or whatever you wanted to return from a terminal symbol. (Sorry, you said you knew that, but some people reading this might not.)

因此​​，采取一切你woud已经从根或顶部规则返回，并保存（在连接C还原code）您喜欢的任何方式。

So, take whatever you woud have returned from the root or top rule, and save it (in your attached C reduction code) any way you like.

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