main.cpp

来自「一个用C++写的编译器」· C++ 代码 · 共 55 行

#include"stdafx.h"

using namespace std;


void main()
{
	string tempF;
	cout<<"Please input the name of the source file"<<endl;
	cin>>tempF;
	SyntaxAnalyzer myAnalyzer;
	myAnalyzer.initialize(tempF);
	ofstream output;
	tempF="r"+tempF;
	output.open(tempF.c_str());
	string message="";
	while(true)
	{
		message=myAnalyzer.parse();
		if(message!="Parsing ended")
		{
			if(message[message.length()-1]==' ')
			{
				output<<setw(40)<<transfer(message.substr(0,message.length()-1))
					<<"   ->"+transSeq(myAnalyzer.getCurrentProduction()->entry)<<endl
					//this sentence output the production used.
					  <<setw(40)<<"ε"<<endl;
			}
			else if(message.length()>6)
			{
					output<<setw(40)<<message<<"  "<<myAnalyzer.getLine()<<endl;
			}
			else
			{
				if(islower(message[1]))
				{
					output<<setw(10)<<transfer(message)<<endl;
				}
				else
				{
					output<<setw(40)<<transfer(message)<<"   "<<"->"+transSeq(myAnalyzer.getCurrentProduction()->entry)<<endl;
				}
			}
		}
		else
		{
			output<<setw(40)<<message;
			break;
		}
	}
	cout<<"Work Done"<<endl;
}