pt-except.h

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////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 1996-2023 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 (int l = -1, int c = -1)
    : tree_command (l, c), m_try_code (nullptr), m_catch_code (nullptr),
      m_expr_id (nullptr), m_lead_comm (nullptr), m_mid_comm (nullptr),
      m_trail_comm (nullptr)
  { }
 
  tree_try_catch_command (tree_statement_list *tc, tree_statement_list *cc,
                          tree_identifier *id,
                          comment_list *cl = nullptr,
                          comment_list *cm = nullptr,
                          comment_list *ct = nullptr,
                          int l = -1, int c = -1)
    : tree_command (l, c), m_try_code (tc), m_catch_code (cc),
      m_expr_id (id), m_lead_comm (cl), m_mid_comm (cm), m_trail_comm (ct)
  { }
 
  // No copying!
 
  tree_try_catch_command (const tree_try_catch_command&) = delete;
 
  tree_try_catch_command& operator = (const tree_try_catch_command&) = delete;
 
  ~tree_try_catch_command (void);
 
  tree_identifier * identifier (void) { return m_expr_id; }
 
  tree_statement_list * body (void) { return m_try_code; }
 
  tree_statement_list * cleanup (void) { return m_catch_code; }
 
  comment_list * leading_comment (void) { return m_lead_comm; }
 
  comment_list * middle_comment (void) { return m_mid_comm; }
 
  comment_list * trailing_comment (void) { return m_trail_comm; }
 
  void accept (tree_walker& tw)
  {
    tw.visit_try_catch_command (*this);
  }
 
private:
 
  // The first block of code to attempt to execute.
  tree_statement_list *m_try_code;
 
  // The code to execute if an error occurs in the first block.
  tree_statement_list *m_catch_code;
 
  // Identifier to modify.
  tree_identifier *m_expr_id;
 
  // Comment preceding TRY token.
  comment_list *m_lead_comm;
 
  // Comment preceding CATCH token.
  comment_list *m_mid_comm;
 
  // Comment preceding END_TRY_CATCH token.
  comment_list *m_trail_comm;
};
 
// Simple exception handling.
 
class tree_unwind_protect_command : public tree_command
{
public:
 
  tree_unwind_protect_command (int l = -1, int c = -1)
    : tree_command (l, c),
      m_unwind_protect_code (nullptr), m_cleanup_code (nullptr),
      m_lead_comm (nullptr), m_mid_comm (nullptr), m_trail_comm (nullptr)
  { }
 
  tree_unwind_protect_command (tree_statement_list *tc,
                               tree_statement_list *cc,
                               comment_list *cl = nullptr,
                               comment_list *cm = nullptr,
                               comment_list *ct = nullptr,
                               int l = -1, int c = -1)
    : tree_command (l, c), m_unwind_protect_code (tc), m_cleanup_code (cc),
      m_lead_comm (cl), m_mid_comm (cm), m_trail_comm (ct)
  { }
 
  // No copying!
 
  tree_unwind_protect_command (const tree_unwind_protect_command&) = delete;
 
  tree_unwind_protect_command&
  operator = (const tree_unwind_protect_command&) = delete;
 
  ~tree_unwind_protect_command (void);
 
  tree_statement_list * body (void) { return m_unwind_protect_code; }
 
  tree_statement_list * cleanup (void) { return m_cleanup_code; }
 
  comment_list * leading_comment (void) { return m_lead_comm; }
 
  comment_list * middle_comment (void) { return m_mid_comm; }
 
  comment_list * trailing_comment (void) { return m_trail_comm; }
 
  void accept (tree_walker& tw)
  {
    tw.visit_unwind_protect_command (*this);
  }
 
private:
 
  // The first body of code to attempt to execute.
  tree_statement_list *m_unwind_protect_code;
 
  // The body of code to execute no matter what happens in the first
  // body of code.
  tree_statement_list *m_cleanup_code;
 
  // Comment preceding UNWIND_PROTECT token.
  comment_list *m_lead_comm;
 
  // Comment preceding UNWIND_PROTECT_CLEANUP token.
  comment_list *m_mid_comm;
 
  // Comment preceding END_UNWIND_PROTECT token.
  comment_list *m_trail_comm;
};
 
OCTAVE_END_NAMESPACE(octave)
 
#endif