pt-except.h

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////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 1996-2025 The Octave Project Developers
//
// See the file COPYRIGHT.md in the top-level directory of this
// distribution or <https://octave.org/copyright/>.
//
// This file is part of Octave.
//
// Octave 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 of the License, or
// (at your option) any later version.
//
// Octave 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 Octave; see the file COPYING.  If not, see
// <https://www.gnu.org/licenses/>.
//
////////////////////////////////////////////////////////////////////////
 
#if ! defined (octave_pt_except_h)
#define octave_pt_except_h 1
 
#include "octave-config.h"
 
#include "pt-cmd.h"
#include "pt-id.h"
#include "pt-walk.h"
 
OCTAVE_BEGIN_NAMESPACE(octave)
 
class comment_list;
class tree_statement_list;
 
// Simple exception handling.
 
class tree_try_catch_command : public tree_command
{
public:
 
  tree_try_catch_command (const token try_tok, tree_statement_list *tc, const token catch_tok, tree_identifier *id, tree_statement_list *cc, const token& end_tok)
    : m_try_tok (try_tok), m_try_code (tc), m_catch_tok (catch_tok), m_expr_id (id), m_catch_code (cc), m_end_tok (end_tok)
  { }
 
  OCTAVE_DISABLE_COPY_MOVE (tree_try_catch_command)
 
  ~tree_try_catch_command ();
 
  filepos beg_pos () const { return m_try_tok.beg_pos (); }
  filepos end_pos () const { return m_end_tok.end_pos (); }
 
  tree_identifier * identifier () { return m_expr_id; }
 
  tree_statement_list * body () { return m_try_code; }
 
  tree_statement_list * cleanup () { return m_catch_code; }
 
  void accept (tree_walker& tw)
  {
    tw.visit_try_catch_command (*this);
  }
 
private:
 
  token m_try_tok;
 
  // The first block of code to attempt to execute.
  tree_statement_list *m_try_code;
 
  token m_catch_tok;
 
  // Identifier to modify.
  tree_identifier *m_expr_id;
 
  // The code to execute if an error occurs in the first block.
  tree_statement_list *m_catch_code;
 
  token m_end_tok;
};
 
// Simple exception handling.
 
class tree_unwind_protect_command : public tree_command
{
public:
 
  tree_unwind_protect_command (const token& unwind_tok, tree_statement_list *tc, const token& cleanup_tok, tree_statement_list *cc, const token& end_tok)
    : m_unwind_tok (unwind_tok), m_unwind_protect_code (tc), m_cleanup_tok (cleanup_tok), m_cleanup_code (cc), m_end_tok (end_tok)
  { }
 
  OCTAVE_DISABLE_COPY_MOVE (tree_unwind_protect_command)
 
  ~tree_unwind_protect_command ();
 
  filepos beg_pos () const { return m_unwind_tok.beg_pos (); }
  filepos end_pos () const { return m_end_tok.end_pos (); }
 
  tree_statement_list * body () { return m_unwind_protect_code; }
 
  tree_statement_list * cleanup () { return m_cleanup_code; }
 
  void accept (tree_walker& tw)
  {
    tw.visit_unwind_protect_command (*this);
  }
 
private:
 
  token m_unwind_tok;
 
  // The first body of code to attempt to execute.
  tree_statement_list *m_unwind_protect_code;
 
  token m_cleanup_tok;
 
  // The body of code to execute no matter what happens in the first
  // body of code.
  tree_statement_list *m_cleanup_code;
 
  token m_end_tok;
};
 
OCTAVE_END_NAMESPACE(octave)
 
#endif