/*

Copyright (C) 2003-2016 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_pt_fcn_handle_h)
#define octave_pt_fcn_handle_h 1

#include "octave-config.h"

#include <iosfwd>
#include <string>

#include "pt-bp.h"
#include "pt-exp.h"
#include "pt-misc.h"
#include "pt-stmt.h"
#include "symtab.h"

class octave_value_list;

class tree_walker;

#include "ov.h"
#include "ov-usr-fcn.h"
#include "symtab.h"

class
tree_fcn_handle : public tree_expression
{
public:

  tree_fcn_handle (int l = -1, int c = -1)
    : tree_expression (l, c), nm () { }

  tree_fcn_handle (const std::string& n, int l = -1, int c = -1)
    : tree_expression (l, c), nm (n) { }

  ~tree_fcn_handle (void) { }

  bool has_magic_end (void) const { return false; }

  void print (std::ostream& os, bool pr_as_read_syntax = false,
              bool pr_orig_txt = true);

  void print_raw (std::ostream& os, bool pr_as_read_syntax = false,
                  bool pr_orig_txt = true);

  std::string name (void) const { return nm; }

  bool rvalue_ok (void) const { return true; }

  octave_value rvalue1 (int nargout = 1);

  octave_value_list rvalue (int nargout);

  tree_expression *dup (symbol_table::scope_id scope,
                        symbol_table::context_id context) const;

  void accept (tree_walker& tw);

private:

  // The name of this function handle.
  std::string nm;

  // No copying!

  tree_fcn_handle (const tree_fcn_handle&) = delete;

  tree_fcn_handle& operator = (const tree_fcn_handle&) = delete;
};

class
tree_anon_fcn_handle : public tree_expression
{
public:

  tree_anon_fcn_handle (int l = -1, int c = -1)
    : tree_expression (l, c), fcn (0), file_name () { }

  tree_anon_fcn_handle (tree_parameter_list *pl, tree_parameter_list *rl,
                        tree_statement_list *cl, symbol_table::scope_id sid,
                        int l = -1, int c = -1)
    : tree_expression (l, c),
      fcn (new octave_user_function (sid, pl, rl, cl)),
      file_name () { }

  ~tree_anon_fcn_handle (void) { delete fcn; }

  bool has_magic_end (void) const { return false; }

  bool rvalue_ok (void) const { return true; }

  octave_value rvalue1 (int nargout = 1);

  octave_value_list rvalue (int nargout);

  tree_parameter_list *parameter_list (void) const
  {
    return fcn ? fcn->parameter_list () : 0;
  }

  tree_parameter_list *return_list (void) const
  {
    return fcn ? fcn->return_list () : 0;
  }

  tree_statement_list *body (void) const
  {
    return fcn ? fcn->body () : 0;
  }

  symbol_table::scope_id scope (void) const
  {
    return fcn ? fcn->scope () : -1;
  }

  tree_expression *dup (symbol_table::scope_id scope,
                        symbol_table::context_id context) const;

  void accept (tree_walker& tw);

  void stash_file_name (const std::string& file) { file_name = file; }

private:

  // The function.
  octave_user_function *fcn;

  // Filename where the handle was defined.
  std::string file_name;

  // No copying!

  tree_anon_fcn_handle (const tree_anon_fcn_handle&) = delete;

  tree_anon_fcn_handle& operator = (const tree_anon_fcn_handle&) = delete;
};

#endif