grammer.h

用C语言实现的PL0的源代码

#ifndef __YUFA_H
#define __YUFA_H

#include "pl0.h"
#include "MorP.h"
#include "symset.h"

#define MAX_LEVEL	3	//max depth of block nesting

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 constdeclaration();
	void vardeclaration();
	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];			//data allocation index
	int lev;
	CSymbolSet declbegsys,statbegsys,facbegsys;
};

#endif //yufa.h