yufa.h

c语言做的pl0编译器

// yufa.h: interface for the yufa class.
//////////////////////////////////////////////////////////////////////
#ifndef __YUFA_H
#define __YUFA_H
#include "pl0.h"
#include "cifa.h"
#include "symset.h"
#define MAX_LEVEL	3            //最大层差

class CYufa
{
public:
	CYufa(CPlCompiler*p);
	void Analysis();
	int DataAddr(){return dx[lev];}
	int Level(){return lev;}

private:
	void getsym(){sym=pl->cifa->GetSymbol();}
	void test(CSymbolSet s1,CSymbolSet s2,int n);
	void block(CSymbolSet fsys);
	void vardeclaration();
	void constdeclaration();
	void statement(CSymbolSet fsys);
	void expression(CSymbolSet fsys);
	void term(CSymbolSet fsys);
	void factor(CSymbolSet fsys);
	void condition(CSymbolSet fsys);

private:
	CPlCompiler *pl;
	symbol sym;
	int dx[MAX_LEVEL+1];		 //数据段内存分配指针
	int lev;
	CSymbolSet declbegsys,statbegsys,facbegsys;
};

#endif