main.cpp

该程序是一个MiniPascal语言的编译器

#include "list.h"
#include "global.h"

#include <iostream.h>
#include <string.h>
//----------------------------------------------------------------------------------------------//

//							main函数部分

//包括全局变量的实现，以及源文件的输入和用户界面的提供等

//----------------------------------------------------------------------------------------------//

//**********************************************************************************************//

//					全局变量的实现、初始化(声明在global.h中)

//*********************************************************************************************//

int off;
int lookahead;
char Typename[SIZE];
int ConstVal;
char Constname[SIZE];
char ch;
char token[SIZE];
FILE* testfile;
char errortype[SIZE];
int rightvar;
int leftvar;
int parameterth;
int errorcount=0;
int LINE=1;
type_list typelist[SIZE];
proc_list* cur_proc=new proc_list;

var_list* cur_varlist=new var_list;
proc_list* proc=new proc_list;
var_list* var=new var_list;
field_table* field=new field_table;
int pfollow=0;
int typecount=4;//initial is new type
int VarType=-1;

char progname[SIZE];

void loadprogram();
void program();

void main()
{
	
	char filename[SIZE];
	char objname[SIZE];
	char c;
	cout<<"       *********************************************************"<<endl<<endl;
	cout<<"             Welcome to robin's compiler for minpascal!"<<endl<<endl;
	cout<<"       **********************************************************"<<endl;
	cout<<"Please input the name of source file( .pas ) and press ENTER:"<<endl;
	cin>>filename;
	if((testfile=fopen(filename,"r"))==NULL)
	{
		cout<<"Sorry!cannot open source file..."<<endl;
	    return;
	}
	strcpy(progname,filename);
	program();
    for(int i=0;filename[i]!='.';i++)
		objname[i]=filename[i];
	for(;i<SIZE;i++)
		objname[i]=0;
	strcat(objname,".obj");
	cout<<"compiling complete!"<<endl;
	cout<<objname<<" - "<<errorcount<<" error(s)"<<endl;
	if(errorcount>0) return;
	cout<<"would you like to run "<<objname<<" right now?(y|n)"<<endl;
	cin>>c;
	if(c=='y'||c=='Y')
	{
		
		loadprogram();//
		cout<<"end of execution!"<<endl<<endl;
	}
//	}
}