compiler.java

编译原理的课程设计

package source;

import java.util.Queue;
import java.util.Iterator;
import java.util.Collection;
//翻译类
class Compiler 
{
	public static int line = 0;
    //语法制导翻译
	public static void main(String[] args)
	{
		LexicalAnalysis words = new LexicalAnalysis();
		GrammarAnalysis grmr = new GrammarAnalysis();
		String exp = "";
		Queue<Word> optr;
		int status = 1;
		while(((exp = Input.newLine()) != null) && (status == 1))
		{
			//词法分析
			optr = words.lexical_analysis(exp);
			//语法分析
			status = grmr.grammar_analysis(optr);
		}
		Input.close();
		if(status == -1)
			System.out.println("语法错误在第[ " + Input.line + " ]行！");
		else if(status == 1)
			System.out.println("不全的条件语句！");
		else
		{
			Word wrd = grmr.opStack.pop();
			wrd = grmr.opStack.pop();
			if(wrd.Code == 0)
			{
				wrd = grmr.opStack.pop();
				if(wrd.Code == 27)
					System.out.println("正确，编译完毕！");
			}
			else
			{
				System.out.println("检查到未知错误！");
			}
		}
	}
}