pc.cpp

这是一个语法分析器

// PL0 Compiler
#include <stdio.h>
#include <conio.h>
#include <string.h>
#include "pl0.h"

void main(int argc,char *argv[])
{
	char filename[256];

	if (argc!=2)
	{
		printf("请输入源文件:");
		gets(filename);
	}
	else
		strcpy(filename,argv[1]);

	CPlCompiler pl(filename);
	char ch;

	if (pl.FileEmpty())
	{
		printf("source file cannot be opened!\n");
		return;
	}

	printf("要不要显示源文件?(y/n): ");
	ch=getch();
	while (ch!='y'&&ch!='n') ch=getch();
	printf("%c\n",ch);
	if (ch=='y') pl.DisplaySrcfile();

	
	pl.Compile();
	if (pl.ErrorNumber())
	{
		pl.DisplayErrors();
	//	printf("continue?(y/n): ");
	//	ch=getch();
	//	while (ch!='y'&&ch!='n') ch=getch();
	//	printf("%c\n",ch);
	//	if (ch=='n') return;
	}
	else printf("这是正确的程序！\n");

	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\n");
	pl.Interpret();
}