main.java

SkipOOMiniJOOL教学语言的编译器前端

package edu.ustc.cs.minijool.lexer;

import java.io.*;

import org.eclipse.jdt.core.dom.*;
import edu.ustc.cs.minijool.lab2parser.*;

public class Main {

	/**
	 * 主函数，主要作用是检查您所完成的代码的正确性，检查分别由part0-2,请在
	 * 实验完成的不同阶段使用对应的检查runPart方法
	 */
	
	//minijool源语言测试例子所在的文件
	public final static String file = "test/test.mj";
	
	public static void main(String args[]) {
		runPart2();
		//runPart3();
		//runPart4();
	}
	
	public static void runPart2() {
		ExpressionLexer l = new ExpressionLexer("test/expr.txt");
		Symbol s = l.nextToken();
		while (s.getType() != Symbol.EOF) {
			System.out.println(s);
			s = l.nextToken();
		}
	}
	
	public static void runPart3() {
		ASTNode spec = SpecParser.parse("MJLex/MiniJOOL.mlex");
		NFAGenerator nfaGen = new NFAGenerator();
		spec.accept(nfaGen);
		PushbackReader    reader = null;
		try {
			reader = new PushbackReader(new FileReader(file));
		} catch(IOException e) {
			e.printStackTrace();
			System.exit(-1);
		}
		NFASimulator sim = new NFASimulator(reader, nfaGen.getNFA());
		
		Symbol s = sim.nextToken();
		while (s.getType() != Symbol.EOF) {
			System.out.println(s);
			s = sim.nextToken();
		}
	}
	
	public static void runPart4() {
		PushbackReader reader = null;
		
		try {
			reader = new PushbackReader(new FileReader(file));
		} catch(IOException e) {
			System.out.println(e);
			System.exit(-1);
		}
		
		NFASimulator lexer = new NFASimulator(reader, (new LexerCode()).getNFA());
		
		Symbol s = lexer.nextToken();
		while(s.getType() != Symbol.EOF) {
			System.out.println(s);
			s = lexer.nextToken();
		} 
	}
}