pt.cc

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/*

Copyright (C) 1996-2018 John W. Eaton

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 (HAVE_CONFIG_H)
#  include "config.h"
#endif

#include <iostream>
#include <sstream>
#include <string>

#include "ov-fcn.h"
#include "pt.h"
#include "pt-pr-code.h"
#include "unwind-prot.h"

namespace octave
{
  // Hide the details of the string buffer so that we are less likely to
  // create a memory leak.

  std::string
  tree::str_print_code (void)
  {
    std::ostringstream buf;

    tree_print_code tpc (buf);

    accept (tpc);

    std::string retval = buf.str ();

    return retval;
  }

  // function from libinterp/parse-tree/oct-parse.cc, not listed in oct-parse.h
  octave_value_list eval_string (const std::string&, bool, int&, int);
  // Is the current breakpoint condition met?
  bool
  tree::meets_bp_condition () const
  {
    bool retval;
    if (m_bp_cond == nullptr)
      retval = false;
    else if (m_bp_cond->empty ())     // empty condition always met
      retval = true;
    else
      {
        int parse_status = 0;

        unwind_protect frame;
        frame.protect_var (buffer_error_messages);
        frame.protect_var (Vdebug_on_error);
        frame.protect_var (Vdebug_on_warning);

        buffer_error_messages++;
        Vdebug_on_error = false;
        Vdebug_on_warning = false;

        retval = true;                // default to stopping if any error
        try
          {
            octave_value_list val
              = eval_string (*m_bp_cond, 1, parse_status, 1);

            if (parse_status == 0)
              {
                if (! val(0).is_scalar_type ())
                  warning ("Breakpoint condition must be a scalar, not size %s",
                           val(0).dims ().str ('x').c_str ());
                else
                  retval = val(0).bool_value ();
              }
            else
              warning ("Error parsing breakpoint condition");
          }
        catch (const execution_exception& e)
          {
            warning ("Error evaluating breakpoint condition:\n    %s",
                     last_error_message ().c_str ());
          }
      }
    return retval;
  }
}