lex.h

利用flex写的C_minus的词法分析器

#ifndef _LEX_H_
#define _LEX_H_

typedef struct{
	int code;	// 单词代码
	int addr;	// 地址
} token;	// 单词

typedef struct{
	char name[33];	// 组成关键字的字符串，最长32个字符
	int code;		// 关键字代码
} keyword;

typedef struct{
	int number;
	char name[30];//组成标识符或常数的字符串
} symbol;

// 定义一些常量
enum TVAL { $AUTO=1,$BREAK,$CASE,$CHAR,$CONST,$CONTINUE,$DEFAULT,$DO,$DOUBLE,
			$ELSE,$ENUM,$EXTERN,$FLOAT,$FOR,$GOTO,$IF,$INT,$LONG,$REGISTER,
			$RETURN,$SHORT,$SIGNED,$SIZEOF,$STATIC,$STRUCT,$SWITCH,$TYPEDEF,
			$UNION,$UNSIGNED,$VOID,$VOLATILE,$WHILE,$NULL,
			$ADD,$SUB,$MUL,$DIV,$MOD,$ASSIGN,$EQUAL,$LT,$LE,$GT,$GE,$NE,
		//	+	-	*	/	%	=	==	<	<=	<	>	>= !=
			$INC,$DEC,$ADDA,$SUBA,$MULA,$DIVA,$MODA,$LSHIFTA,$RSHIFTA,$BITANDA,$BITXORA,$BITORA,
		//	++	--	+=	-=	*=	/=	%=	<<=	>>=	&=	^=	|=
			$LOGICNOT,$LOGICAND,$LOGICOR,$LSHIFT,$RSHIFT,$BITNOT,$BITOR,$BITXOR,$BITAND,$ARROWOP,
		//	!	&& ||	|	<<	>>	~	|	^	&	->
			$LRBRACKET,$RRBRACKET,$LBRACE,$RBRACE,$LSBRACKET,$RSBRACKET,$SEMICOLON,$COMMA,$COLON,$QUES,
		//	(	)	{	}	[	]	; 	,	:	?
			$ID,$INTNUM,$FLOATNUM,$CHARTYPE,$STRINGTYPE,$COMMENT, $ERROR, $END};							
		// 标识符, 整型常量，浮点常量，字符常量, 字符串常量，注释
		
#endif	// #ifndef _LEX_H_