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Created April 15, 2019 07:10 — forked from yydai/
chapter4 of antlr4---Building a Calculator Using a Visitor
* Excerpted from "The Definitive ANTLR 4 Reference",
* published by The Pragmatic Bookshelf.
* Copyrights apply to this code. It may not be used to create training material,
* courses, books, articles, and the like. Contact us if you are in doubt.
* We make no guarantees that this code is fit for any purpose.
* Visit for more book information.
import org.antlr.v4.runtime.*;
import org.antlr.v4.runtime.tree.ParseTree;