/*
 * token.h - definition of lexical tokens for D compiler
 * CSE 413 au07
 *TODO: add constants for remaining lexical token classes
 *      (note: integer values do not need to be contiguous, but since
 *       token classes are used in switch statements, it's best to keep
 *       the values relatively small.  feel free to change any of these
 *       values - the exact integers assigned to the names don't matter.)
 */

#ifndef TOKEN_H
#define TOKEN_H

/*----- Lexical classes -----*/

/*----- EOF, ID, and INT -----*/

#define TOK_EOF    0   /* end of file */
#define TOK_ID     1   /* identifier  */
#define TOK_INTGR  2   /* integer */

/*----- D keywords -----*/

#define TOK_INT   10   /* int */
#define TOK_IF    11   /* if */
#define TOK_ELSE  12   /* else */

/*----- Operators, punctuation, and delimiters */

#define LPAREN    20   /* (  */
#define RPAREN    21   /* )  */
#define COMMA     22   /* ,  */
#define BECOMES   23   /* =  */
#define EQUALS    24   /* == */
#define PLUS      25   /* +  */
#define MINUS     26   /* -  */

/*----- Token type definition and toString function -----*/

/* Length of longest possible identifier + 1 */
#define MAX_ID_LENGTH 31

typedef struct {           /* One lexical token: */
  int  kind;               /* Lexical class      */
  char id[MAX_ID_LENGTH];  /* if kind is TOK_ID, the actual identifier */
  int  val;                /* if kind is TOK_INTGR, the int constant value */
} Token;

/* Store a string representation of Token t in s. */
/* pre: s must have enough space for the result.  */
void tok2str(Token t, char* s);

#endif /* ifndef TOKEN_H */