pl0.cpp

c语言做的pl0编译器

///////////////////////////////////////////////////////////////////////
#include <stdio.h>
#include "pl0.h"
#include "cifa.h"
#include "errors.h"
#include "table.h"
#include "code.h"
#include "yufa.h"

CPlCompiler::CPlCompiler(char *filename)
{
	if (fp=fopen(filename,"r"))
	{
		errors=new CErrors(this);
		table=new Ctable(this);
		code=new Ccode;
		cifa=new CCifa(this);
		yufa=new CYufa(this);
	}
	else
	{
		cifa=0;
		errors=0;
		code=0;
		table=0;
		yufa=0;
	}
}
CPlCompiler::~CPlCompiler()
{
	if (cifa) delete cifa;
	if (errors) delete errors;
	if (code) delete code;
	if (table) delete table;
	if (yufa) delete yufa;
	if (fp) fclose(fp);
}
int CPlCompiler::Compile()
{
	if (!(cifa && yufa && code && errors && table && fp))
		return 0;
	yufa->Analysis();
	return 1;
}
void CPlCompiler::DisplaySrcfile()
{
	if (!fp) return;
	long pos=ftell(fp);
	fseek(fp,0,SEEK_SET);
	char ch;
	while((ch=getc(fp))!=EOF) putchar(ch);
	putchar('\n');
	fseek(fp,pos,SEEK_SET);
}
int CPlCompiler::ErrorNumber()
{
	if (!errors) return 0;
	return errors->Number();
}
void CPlCompiler::DisplayErrors()
{
	if (errors) errors->Display();
}
void CPlCompiler::ListCode()
{
	if (code) code->ListCode();
}
void CPlCompiler::Interpret()
{
	if (code) code->Interpret();
}