init

src/Evalvisitor.cpp

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+#include "Evalvisitor.h"

src/Evalvisitor.h

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+#pragma once
+#ifndef PYTHON_INTERPRETER_EVALVISITOR_H
+#define PYTHON_INTERPRETER_EVALVISITOR_H
+
+
+#include "Python3ParserBaseVisitor.h"
+
+
+class EvalVisitor : public Python3ParserBaseVisitor {
+	// TODO: override all methods of Python3ParserBaseVisitor
+};
+
+
+#endif//PYTHON_INTERPRETER_EVALVISITOR_H

src/main.cpp

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+#include "Evalvisitor.h"
+#include "Python3Lexer.h"
+#include "Python3Parser.h"
+#include "antlr4-runtime.h"
+#include <iostream>
+using namespace antlr4;
+// TODO: regenerating files in directory named "generated" is dangerous.
+//       if you really need to regenerate,please ask TA for help.
+int main(int argc, const char *argv[]) {
+	// TODO: please don't modify the code below the construction of ifs if you want to use visitor mode
+	ANTLRInputStream input(std::cin);
+	Python3Lexer lexer(&input);
+	CommonTokenStream tokens(&lexer);
+	tokens.fill();
+	Python3Parser parser(&tokens);
+	tree::ParseTree *tree = parser.file_input();
+	EvalVisitor visitor;
+	visitor.visit(tree);
+	return 0;
+}