token.h

来自「linux下的Ｃ语言开发」· C头文件 代码 · 共 47 行

/********************************************************
 * token -- token handling module			*
 *							*
 * Functions:						*
 *	next_token -- get the next token from the input	*
 ********************************************************/

/*
 * Define the enumerated list of tokens.
 */
enum TOKEN_TYPE {
   T_NUMBER,		/* Simple number (floating point or integer */
   T_STRING,		/* String or character constant */
   T_COMMENT,	/* Comment */
   T_NEWLINE,	/* Newline character */
   T_OPERATOR,	/* Arithmetic operator */
   T_L_PAREN,	/* Character "(" */
   T_R_PAREN,	/* Character ")" */
   T_L_CURLY,	/* Character "{" */
   T_R_CURLY,	/* Character "}" */
   T_ID,		/* Identifier */
   T_EOF		/* End of File */
};

/*
 * We use #define here instead of "const int" because so many old
 * software packeges use #define.  It's very possible we've picked
 * up a header file that uses #define for TRUE/FALSE.  So that
 * why we protect against double defines as well as using #define
 * ourselves.
 */
#ifndef TRUE
#define TRUE 1		/* Define a simple TRUE/FALSE values */
#define FALSE 0
#endif /* TRUE */

/********************************************************
 * next_token -- read the next token in an input stream	*
 *							*
 * Parameters						*
 *	in_file -- file to read				*
 *							*
 * Returns						*
 *	next token					*
 ********************************************************/
extern enum TOKEN_TYPE next_token(void);