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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