// scan.h: interface for the Cscan class.
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_SCAN_H__F0293CE1_81AC_47F0_9918_257702C11C14__INCLUDED_)
#define AFX_SCAN_H__F0293CE1_81AC_47F0_9918_257702C11C14__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#include "global.h"
	
/*****************詞法分析器確定性有限自動機DFA的狀態類型*************/				             
/* START 開始狀態; INASSIGN 賦值狀態; INRANGE 下標范圍狀態;          */
/* INNUM 數字狀態; INID 標識符狀態; DONE 完成狀態;                   */
/* INCHAR 字符狀態;INCOMMENT 注釋狀態;                               */

typedef enum
   { START,INASSIGN,INRANGE,INCOMMENT,INNUM,INID,INCHAR,DONE }
   StateType;

//保留字查找表：

  typedef struct 
    { char*   str;
      LexType tok;				
    } ReservedTable;


//初始化保留字查找表：
static const   ReservedTable   reservedWords[MAXRESERVED]
	= { 
	{"program",PROGRAM},
	{"type",TYPE},
	{"var",VAR},
	{"procedure",PROCEDURE},
	{"begin",BEGIN},
	{"end",END},
	{"array",ARRAY},
	{"of",OF},
	{"record",RECORD},
	{"if",IF},
	{"then",THEN},
	{"else",ELSE},
	{"fi",FI},
	{"while",WHILE},
	{"do",DO},
	{"endwh",ENDWH},
	{"read",READ},
	{"write",WRITE},
	{"return",RETURN},
	{"integer",INTEGER},
	{"char",CHAR1}
	};
   
class Cscan : public Cglobal  
{
public:
	
/*************     變量聲明    ***************************/
/* 源代碼文本文件指針source */
 FILE *source;


/*詞法分析結果Token序列的存儲文件指針fp*/
 FILE* fp;


/* tokenString用于保存標識符和保留字單詞的詞元,長度41 */
char tokenString[MAXTOKENLEN+1];

/* BUFLEN源代碼行的輸入緩沖區長度為256 */
#define BUFLEN 256

/* lineBuf為當前輸入代碼行緩沖區 */
 char lineBuf[BUFLEN];

/* linepos為在代碼緩沖區LineBuf中的當前字符位置,初始為0 */
 int linepos ;

/* bufsize為當前緩沖器中所存字串大小 */
 int bufsize ;

/* EOF_flag當為文件尾時,改變函數ungetNextChar功能 */
 int EOF_flag ;

 

 public:
 
	Cscan();
	virtual ~Cscan();
    void  getTokenList(CString  pgm);
    void printTokenlist( );

protected:
	
	/*詞法分析用到的功能函數*/
	 int  getNextChar(void);
	 
	 void ungetNextChar(void);
	 
     void ChainToFile (ChainNodeType *p);
	
	 void  printToken(TokenType token);
    
	 LexType  reservedLookup (char * s);
};

#endif // !defined(AFX_SCAN_H__F0293CE1_81AC_47F0_9918_257702C11C14__INCLUDED_)