// Arithmetic interpreter parser declaration.
//
// OWNER:       course
// NAME:        parser.h
// VERSION:     1
// DATE:        12/26/93
//
// This file declares the arithmetic interpreter parser.
//

#ifndef _PARSER_H_
#define _PARSER_H_

#include "avalue.h"     // The avalue type.

// The grammar for the arithmetic language is as
// follows:
//
//      <expr>     -> <term> {[+,-]<term>}*
//      <term>     -> <factor> {[*,/]<factor>}*
//      <factor>   -> <atom> | <number> | (<expr>)
//                  | -<factor>
//      <asst>     -> <atom> = <expr>;
//      <program>  -> {<asst>}*.
//
// The parser calls avalue type routines, which can be
// changed without changing the parser or the rest of
// the interpreter program.
 
avalue expr (void);
avalue term (void);
avalue factor (void);
avalue asst (void);
avalue program (void);

#endif  // _PARSER_H_