| /* Copyright (C) 2021-2023 Free Software Foundation, Inc. |
| Contributed by Oracle. |
| |
| This file is part of GNU Binutils. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3, or (at your option) |
| any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, 51 Franklin Street - Fifth Floor, Boston, |
| MA 02110-1301, USA. */ |
| |
| #ifndef _QLPARSER_H |
| #define _QLPARSER_H |
| |
| #include <sstream> |
| #include <istream> |
| #include <iostream> |
| #include "Expression.h" |
| |
| /* This class contains parser inputs (a string, if non-NULL: if NULL, use cin), |
| and outputs (obtained via operator(), which resets the output |
| expression). The destructor deletes the returned expression to allow |
| exception throws on syntax error to clean up properly. */ |
| |
| namespace QL |
| { |
| struct Result |
| { |
| std::stringstream streamify; |
| public: |
| std::istream in; |
| Expression *out; |
| |
| Result () : in (std::cin.rdbuf ()), out (NULL) { } |
| Result (const char *instr) : streamify (std::string (instr)), |
| in (streamify.rdbuf ()), out (NULL) { } |
| |
| Expression *operator() () |
| { |
| Expression *o = out; |
| out = NULL; |
| return o; |
| } |
| |
| ~Result () |
| { |
| delete out; |
| } |
| }; |
| }; |
| |
| #endif /* _QLPARSER_H */ |