////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2003-2026 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_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 "pt-walk.h"
#include "symscope.h"

class octave_value_list;

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

OCTAVE_BEGIN_NAMESPACE(octave)

class OCTINTERP_API tree_fcn_handle : public tree_expression
{
public:

  tree_fcn_handle (const token& tok) : m_token (tok), m_name (m_token.text ()) { }

  OCTAVE_DISABLE_COPY_MOVE (tree_fcn_handle)

  ~tree_fcn_handle () = default;

  filepos beg_pos () const { return m_token.beg_pos (); }
  filepos end_pos () const { return m_token.end_pos (); }

  comment_list leading_comments () const { return m_token.leading_comments (); }
  comment_list trailing_comments () const { return m_token.trailing_comments (); }

  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);

  token at_token () const { return m_token; }

  std::string name () const { return m_name; }

  bool rvalue_ok () const { return true; }

  tree_expression * dup (symbol_scope& scope) const;

  octave_value evaluate (tree_evaluator& tw, int nargout = 1);

  octave_value_list evaluate_n (tree_evaluator& tw, int nargout = 1)
  {
    return ovl (evaluate (tw, nargout));
  }

  void accept (tree_walker& tw)
  {
    tw.visit_fcn_handle (*this);
  }

private:

  token m_token;

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

class OCTINTERP_API tree_anon_fcn_handle : public tree_expression
{
public:

  tree_anon_fcn_handle (const token& at_tok, tree_parameter_list *pl, tree_expression *ex, const symbol_scope& scope, const symbol_scope& parent_scope)
    : m_at_tok (at_tok), m_parameter_list (pl), m_expression (ex), m_scope (scope), m_parent_scope (parent_scope)
  { }

  OCTAVE_DISABLE_COPY_MOVE (tree_anon_fcn_handle)

  ~tree_anon_fcn_handle ();

  filepos beg_pos () const { return m_at_tok.beg_pos (); }
  filepos end_pos () const { return m_expression->end_pos (); }

  comment_list leading_comments () const { return m_at_tok.leading_comments (); }
  comment_list trailing_comments () const { return m_expression->trailing_comments (); }

  bool rvalue_ok () const { return true; }

  token at_token () const { return m_at_tok; }

  tree_parameter_list * parameter_list () const
  {
    return m_parameter_list;
  }

  tree_expression * expression () const { return m_expression; }

  symbol_scope scope () const { return m_scope; }

  symbol_scope parent_scope () const { return m_parent_scope; }

  bool has_parent_scope () const { return m_parent_scope.is_valid (); }

  tree_expression * dup (symbol_scope& scope) const;

  octave_value evaluate (tree_evaluator& tw, int nargout = 1);

  octave_value_list evaluate_n (tree_evaluator& tw, int nargout = 1)
  {
    return ovl (evaluate (tw, nargout));
  }

  void accept (tree_walker& tw) { tw.visit_anon_fcn_handle (*this); }

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

  std::string file_name () const { return m_file_name; }

private:

  token m_at_tok;

  // Inputs parameters.
  tree_parameter_list *m_parameter_list;

  // Function body, limited to a single expression.
  tree_expression *m_expression;

  // Function scope.
  symbol_scope m_scope;

  // Parent scope, or an invalid scope if none.
  symbol_scope m_parent_scope;

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

OCTAVE_END_NAMESPACE(octave)

#endif
