#if !defined(_EXPRPARSER_H_)
#define _EXPRPARSER_H_

#include "expression.h"
#include "lexer.h"
#include "list.h"

// error class
// thrown when an expression error
// is encountered
struct expression_error {
   int line_number;
   char error[64];
   expression_error(int,char*);
};

class expression_parser {
   private:
      lexer* L; // alias, do not deallocate

      // read a non binary expression
      expression* read_one(istream&,list<char*>&);

   public:
      expression_parser(lexer*);
      expression* read(istream&,list<char*>&);
};

#endif