pc.cpp

一个小型的编译器,仿照PL/0实现,能实现pl/0全部功能

// xyzPL/0 Compiler
#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <string.h>
#include "pl0.h"

void main(int argc,char *argv[])
{
	char filename[256];
	printf("xyzpl/0 compiler (imitate pl/0 compiler) version 1.0\nWriten by xyzyang, 2007-6-5\nATTENTION: enter 'q' to exit the compiler\n");
	if (argc!=2)
	{
		printf("source file:");
		gets(filename);
	}
	else
		strcpy(filename,argv[1]);

	CPlCompiler pl(filename);
	char ch;

	if (pl.FileEmpty())
	{
		printf("source file cannot be opened!\n");
		while(getch()!='q') 
		{
			getch();
		}
		exit(0);
	}

	printf("list source file?(y/n): ");
	ch=getch();
	while (ch!='y'&&ch!='n')
	{
		ch=getch();
	}
	printf("%c\n",ch);
	if (ch=='y') 
	{
		pl.DisplaySrcfile();
    }
	printf("compiling...\n\n");
	pl.Compile();
	if (pl.ErrorNumber())
	{
		pl.DisplayErrors();
		printf("\ncontinue?(y/n): ");
		ch=getch();
		while (ch!='y'&&ch!='n') 
		{
			ch=getch();
		}
		printf("%c\n",ch);
		if (ch=='n') exit(1);
	}

	printf("list object code?(y/n): ");
	ch=getch();
	while (ch!='y'&&ch!='n') ch=getch();
	printf("%c\n",ch);
	if (ch=='y') pl.ListCode();
	printf("start to run the programe...............\n");
	pl.Interpret();
	while(getch()!='q')
		getch();
	exit(0);
}