1  /* Copyright (C) 2021-2023 Free Software Foundation, Inc.
       2     Contributed by Oracle.
       3  
       4     This file is part of GNU Binutils.
       5  
       6     This program is free software; you can redistribute it and/or modify
       7     it under the terms of the GNU General Public License as published by
       8     the Free Software Foundation; either version 3, or (at your option)
       9     any later version.
      10  
      11     This program is distributed in the hope that it will be useful,
      12     but WITHOUT ANY WARRANTY; without even the implied warranty of
      13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      14     GNU General Public License for more details.
      15  
      16     You should have received a copy of the GNU General Public License
      17     along with this program; if not, write to the Free Software
      18     Foundation, 51 Franklin Street - Fifth Floor, Boston,
      19     MA 02110-1301, USA.  */
      20  
      21  #ifndef _QLPARSER_H
      22  #define _QLPARSER_H
      23  
      24  #include <sstream>
      25  #include <istream>
      26  #include <iostream>
      27  #include "Expression.h"
      28  
      29  /* This class contains parser inputs (a string, if non-NULL: if NULL, use cin),
      30     and outputs (obtained via operator(), which resets the output
      31     expression).  The destructor deletes the returned expression to allow
      32     exception throws on syntax error to clean up properly.  */
      33  
      34  namespace QL
      35  {
      36    struct Result
      37    {
      38      std::stringstream streamify;
      39    public:
      40      std::istream in;
      41      Expression *out;
      42  
      43      Result () : in (std::cin.rdbuf ()), out (NULL) { }
      44      Result (const char *instr) : streamify (std::string (instr)),
      45  	in (streamify.rdbuf ()), out (NULL) { }
      46  
      47      Expression *operator() ()
      48      {
      49        Expression *o = out;
      50        out = NULL;
      51        return o;
      52      }
      53  
      54      ~Result ()
      55      {
      56        delete out;
      57      }
      58    };
      59  };
      60  
      61  #endif /* _QLPARSER_H */