/***************************************************************
 *                                                             *
 * Scanner class for Aho and Ullman's Pascal subset            *
 *                                                             *
 * Written by : Nancy Ide                                      *
 *                                                             *
 ***************************************************************/

#ifndef SCANNER_H
#define SCANNER_H

#define EQ ==
#define NE !=



/* TOKEN_LIST macro is used to generate an enumerated list of
   token types as well as a string array containing each token
   name -- makes modifying the token list easier.              */

   
// Token types returned by the scanner and used by the parser

#define TOKEN_LIST
   T(T_program),		// Program keyword
   T(T_begin),			// Begin keyword
   T(T_end),			// End 
   T(T_var),			// Var keyword
   T(T_function),		// Function keyword
   T(T_procedure),		// Procedure keyword
   T(T_result),			// Result keyword
   T(T_integer),		// Integer keyword
   T(T_real),			// Real keyword
   T(T_array),			// Array keyword
   T(T_of),			// Of keyword
   T(T_if),			// If keyword
   T(T_then),			// Then keyword
   T(T_else),			// Else keyword
   T(T_while),			// While keyword
   T(T_do),			// Do keyword
   T(T_not),			// Not keyword
   T(T_identifier),		// Identifier
   T(T_constant),		// Constant (integer or real number)
   T(T_relop),			// Relop("=", "<> ", "< ", "> ", "< =", "> =" )
   T(T_mulop),			// Mulop("*", "/", "div","mod", "and")
   T(T_addop),			// Addop("+", "-", "or")
   T(T_assignop),		// Assignment operator (";=")
   T(T_comma),			// Comma
   T(T_semicolon),		// Semicolon
   T(T_colon),			// Colon
   T(T_rightparen),		// Right parenthesis
   T(T_leftparen),		// Left parenthesis
   T(T_rightbracket),		// Right bracket
   T(T_leftbracket),		// Left bracket
   T(T_unaryminus),		// Unary minus
   T(T_unaryplus),		// Unary plus
   T(T_doubledot),		// Doubledot ("..")
   T(T_endmarker),		// End of program marker (".")
   T(T_eof)			// End of file marker


/*
 *     Define the enumerated list of tokens.
 *     Uses a trick with T macro and TOKEN_LIST
 */
#define T(name) name		// Define T() as the name
    enum TOKEN_TYPE {
      TOKEN_LIST
    };
#undef T			// Remove temporary macro


// A list of the names of the tokens
extern const char *const TOKEN_NAMES[] = {

...  // fill in as appropriate

#endif