/*
 * token.c - lexical token functions for D compiler
 * CSE 413 au06
 *TODO: add cases for lexical classes added to token.h and
 *      complete other cases
 */

#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "token.h"

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

    /* EOF, id, integer constants */
  case TOK_EOF: strcpy(s, "EOF"); return;
  case TOK_ID:
    strcpy(s, "ID(");
    strcat(s, t.id);
    strcat(s, ")");
    return;
  case TOK_INTGR:
    /* not implemented yet */
    return;

    /* keywords */
  case TOK_INT:  strcpy(s, "INT");  return;
  case TOK_IF:   strcpy(s, "IF");   return;
  case TOK_ELSE: strcpy(s, "ELSE"); return;

    /* Operators, punctuation, and delimiters */
  case LPAREN:   strcpy(s, "LPAREN");   return;
  case RPAREN:   strcpy(s, "RPAREN");   return;
  case COMMA:    strcpy(s, "COMMA");    return;
  case BECOMES:  strcpy(s, "BECOMES");  return;
  case EQUALS:   strcpy(s, "EQUALS");   return;
  case PLUS:     strcpy(s, "PLUS");     return;
  case MINUS:    strcpy(s, "MINUS");    return;

    /* default: should never happen (indicates programming error) */
  default:
    fprintf(stderr, "error: default case reached in tok2str\n");
    exit(EXIT_FAILURE);
  }
}