lexical.h

实现编译器的词法分析

#pragma once
#include "Symbol.h"
class Lexical : public Symbol
{
private:
	char * beffer;
	int  forward;
	int lexeme_beginning;
	int state;
	int line;
	int lockload;
	int mode;
	std::ifstream * inputfile;
    Token tok;
    char * word;
    Token gettoken(int digitnum);
    void copyword();
    char nextchar();
	bool isletter(char c);
    bool isdigit(char c);
public:
	
	bool eof;
	int value;
	Lexical(std::ifstream *);
    Token nexttoken();//////////////////////

public:
	~Lexical(void);
};