use exceptions for better invalid index error reporting (bug #45957) * lo-array-gripes.h, lo-array-gripes.cc (index_exception): New base class for indexing errors. (invalid_index, out_of_range): New classes. (gripe_index_out_of_range): New overloaded function. (gripe_invalid_index): New overloaded functions. Delete version with no arguments. (gripe_invalid_assignment_size, gripe_assignment_dimension_mismatch): Delete. Change uses of gripe functions as needed. * Cell.cc (Cell::index, Cell::assign, Cell::delete_elements): Use exceptions to collect error info about and handle indexing errors. * data.cc (Fnth_element, do_accumarray_sum, F__accumarray_sum__, do_accumarray_minmax, do_accumarray_minmax_fun, F__accumdim_sum__): Likewise. * oct-map.cc (octave_map::index, octave_map::assign, octave_map::delete_elements): Likewise. * sparse.cc (Fsparse): Likewise. * sub2ind.cc (Fsub2ind, Find2sub): Likewise. New tests. * utils.cc (dims_to_numel): Likewise. * ov-base-diag.cc (octave_base_diag<DMT, MT>::do_index_op, octave_base_diag<DMT, MT>::subsasgn): Likewise. * ov-base-mat.cc (octave_base_matrix<MT>::subsref, octave_base_matrix<MT>::assign): Likewise. * ov-base-sparse.cc (octave_base_sparse<T>::do_index_op, octave_base_sparse<T>::assign, octave_base_sparse<MT>::delete_elements): Likewise. * ov-classdef.cc (cdef_object_array::subsref, cdef_object_array::subsasgn): Likewise. * ov-java.cc (make_java_index): Likewise. * ov-perm.cc (octave_perm_matrix::do_index_op): Likewise. * ov-range.cc (octave_range::do_index_op): Likewise. * ov-re-diag.cc (octave_diag_matrix::do_index_op): Likewise. * ov-str-mat.cc (octave_char_matrix_str::do_index_op_internal): Likewise. * pt-assign.cc (tree_simple_assignment::rvalue1): Likewise. * pt-idx.cc (tree_index_expression::rvalue, tree_index_expression::lvalue): Likewise. * Array-util.cc (sub2ind): Likewise. * toplev.cc (main_loop): Also catch unhandled index_exception exceptions. * ov-base.cc (octave_base_value::index_vector): Improve error message. * ov-re-sparse.cc (octave_sparse_matrix::index_vector): Likewise. * ov-complex.cc (complex_index): New class. (gripe_complex_index): New function. (octave_complex::index_vector): Use it. * pt-id.h, pt-id.cc (tree_identifier::is_variable, tree_black_hole::is_variable): Now const. * pt-idx.cc (final_index_error): New static function. (tree_index_expression::rvalue, tree_index_expression::lvalue): Use it. * index.tst: New tests.

/*

Copyright (C) 2000-2015 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
<http://www.gnu.org/licenses/>.

*/

#if !defined (octave_comment_list_h)
#define octave_comment_list_h 1

#include <string>

#include <base-list.h>

extern std::string get_comment_text (void);

extern char *get_comment_text_c_str (void);

extern void save_comment_text (const std::string& text);

class
octave_comment_elt
{
public:

  enum comment_type
  {
    unknown,
    block,
    full_line,
    end_of_line,
    doc_string,
    copyright
  };

  octave_comment_elt (const std::string& s = std::string (),
                      comment_type t = unknown)
    : txt (s), typ (t) { }

  octave_comment_elt (const octave_comment_elt& oc)
    : txt (oc.txt), typ (oc.typ) { }

  octave_comment_elt& operator = (const octave_comment_elt& oc)
  {
    if (this != &oc)
      {
        txt = oc.txt;
        typ = oc.typ;
      }

    return *this;
  }

  std::string text (void) const { return txt; }

  comment_type type (void) const { return typ; }

  ~octave_comment_elt (void) { }

private:

  // The text of the comment.
  std::string txt;

  // The type of comment.
  comment_type typ;
};

class
octave_comment_list : public octave_base_list<octave_comment_elt>
{
public:

  octave_comment_list (void) { }

  void append (const octave_comment_elt& elt)
  { octave_base_list<octave_comment_elt>::append (elt); }

  void append (const std::string& s,
               octave_comment_elt::comment_type t = octave_comment_elt::unknown)
  { append (octave_comment_elt (s, t)); }

  octave_comment_list *dup (void) const;
};

#endif