pascal.cpp

C++编写的Pascal词法分析器

#include "stdafx.h"
#include "common.h"
#include "lex.h"
#include "string.h"
#include <iostream.h>

int main(int argc, char* argv[])
{
	if(argc>1)
	{
		strcpy(sourcefile,argv[1]);
		register char* cp;
		cp=&sourcefile[strlen(sourcefile)]-1;
		yyin=fopen(sourcefile,"r");
		while((cp>=sourcefile)&&(*cp!='.')&&(*cp!='\\'))cp--;
		if(*cp=='.')*cp=0;
	}

#ifdef _DEBUG
	else{
		strcpy(sourcefile,"example");
		yyin=fopen("example.pas","r");
	}
#endif
	if(yyin==NULL){
		cout<<"请在屏幕输入源文件,按ctrl+z结束输入"<<endl;
		yyin=0;
	}
	yyout=fopen("out.txt","w");
	while(lex()!=0);//print_result(yyout);
	fclose(yyout);
	if(yyin!=NULL)fclose(yyin);
	return 0;
}