////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 1996-2021 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 (HAVE_CONFIG_H)
#  include "config.h"
#endif

#include <iostream>

#include "Array.h"

#include "defun.h"
#include "error.h"
#include "interpreter.h"
#include "interpreter-private.h"
#include "ops.h"
#include "ov-typeinfo.h"
#include "ov.h"

namespace octave
{
  // FIXME: we should also store all class names and provide a
  // way to list them (calling class with nargin == 0?).

  static NDArray as_nd_array (const Array<int>& x)
  {
    NDArray retval (x.dims ());

    for (int i = 0; i < x.numel (); i++)
      retval.xelem(i) = x(i);

    return retval;
  }

  static boolNDArray as_bool_nd_array (const Array<void *>& x)
  {
    boolNDArray retval (x.dims ());

    for (octave_idx_type i = 0; i < x.numel (); i++)
      retval.xelem (i) = x(i);

    return retval;
  }

  type_info::type_info (int init_tab_sz)
    : num_types (0), types (dim_vector (init_tab_sz, 1), ""),
      vals (dim_vector (init_tab_sz, 1)),
      unary_class_ops (dim_vector (octave_value::num_unary_ops, 1), nullptr),
      unary_ops (dim_vector (octave_value::num_unary_ops, init_tab_sz), nullptr),
      non_const_unary_ops (dim_vector (octave_value::num_unary_ops, init_tab_sz), nullptr),
      binary_class_ops (dim_vector (octave_value::num_binary_ops, 1), nullptr),
      binary_ops (dim_vector (octave_value::num_binary_ops, init_tab_sz, init_tab_sz), nullptr),
      compound_binary_class_ops (dim_vector (octave_value::num_compound_binary_ops, 1), nullptr),
      compound_binary_ops (dim_vector (octave_value::num_compound_binary_ops, init_tab_sz, init_tab_sz), nullptr),
      cat_ops (dim_vector (init_tab_sz, init_tab_sz), nullptr),
      assign_ops (dim_vector (octave_value::num_assign_ops, init_tab_sz, init_tab_sz), nullptr),
      assignany_ops (dim_vector (octave_value::num_assign_ops, init_tab_sz), nullptr),
      pref_assign_conv (dim_vector (init_tab_sz, init_tab_sz), -1),
      widening_ops (dim_vector (init_tab_sz, init_tab_sz), nullptr)
  {
    install_types (*this);

    install_ops (*this);
  }

  int type_info::register_type (const std::string& t_name,
                                const std::string& /* c_name */,
                                const octave_value& val,
                                bool abort_on_duplicate)
  {
    int i = 0;

    for (i = 0; i < num_types; i++)
      {
        if (t_name == types (i))
          {
            if (abort_on_duplicate)
              {
                std::cerr << "duplicate type " << t_name << std::endl;
                abort ();
              }

            warning ("duplicate type %s\n", t_name.c_str ());

            return i;
          }
      }

    int len = types.numel ();

    if (i == len)
      {
        len *= 2;

        types.resize (dim_vector (len, 1), "");

        vals.resize (dim_vector (len, 1), nullptr);

        unary_ops.resize
          (dim_vector (octave_value::num_unary_ops, len), nullptr);

        non_const_unary_ops.resize
          (dim_vector (octave_value::num_unary_ops, len), nullptr);

        binary_ops.resize
          (dim_vector (octave_value::num_binary_ops, len, len), nullptr);

        compound_binary_ops.resize
          (dim_vector (octave_value::num_compound_binary_ops, len, len),
           nullptr);

        cat_ops.resize (dim_vector (len, len), nullptr);

        assign_ops.resize
          (dim_vector (octave_value::num_assign_ops, len, len), nullptr);

        assignany_ops.resize
          (dim_vector (octave_value::num_assign_ops, len), nullptr);

        pref_assign_conv.resize (dim_vector (len, len), -1);

        widening_ops.resize (dim_vector (len, len), nullptr);
      }

    types (i) = t_name;

    // Yes, this object is intentionally not deleted in the destructor
    // so that we avoid a crash on exit for user-defined data types.
    // See bug #53156.  If that problem is properly fixed, then this
    // could be stored as an object instead of a pointer to an object
    // allocated with new.

    vals(i) = new octave_value (val);

    num_types++;

    return i;
  }

  bool type_info::register_unary_class_op (octave_value::unary_op op,
                                           type_info::unary_class_op_fcn f,
                                           bool abort_on_duplicate)
  {
    if (lookup_unary_class_op (op))
      {
        std::string op_name = octave_value::unary_op_as_string (op);

        if (abort_on_duplicate)
          {
            std::cerr << "duplicate unary operator '" << op_name
                      << "' for class dispatch" << std::endl;
            abort ();
          }

        warning ("duplicate unary operator '%s' for class dispatch",
                 op_name.c_str ());
      }

    unary_class_ops.checkelem (static_cast<int> (op))
      = reinterpret_cast<void *> (f);

    return false;
  }

  bool type_info::register_unary_op (octave_value::unary_op op, int t,
                                     unary_op_fcn f, bool abort_on_duplicate)
  {
    if (lookup_unary_op (op, t))
      {
        std::string op_name = octave_value::unary_op_as_string (op);
        std::string type_name = types(t);

        if (abort_on_duplicate)
          {
            std::cerr << "duplicate unary operator '" << op_name
                      << "' for type '" << type_name << "'" << std::endl;
            abort ();
          }

        warning ("duplicate unary operator '%s' for type '%s'",
                 op_name.c_str (), type_name.c_str ());
      }

    unary_ops.checkelem (static_cast<int> (op), t) = reinterpret_cast<void *> (f);

    return false;
  }

  bool
  type_info::register_non_const_unary_op (octave_value::unary_op op, int t,
                                          type_info::non_const_unary_op_fcn f,
                                          bool abort_on_duplicate)
  {
    if (lookup_non_const_unary_op (op, t))
      {
        std::string op_name = octave_value::unary_op_as_string (op);
        std::string type_name = types(t);

        if (abort_on_duplicate)
          {
            std::cerr << "duplicate unary operator '" << op_name
                      << "' for type '" << type_name << "'" << std::endl;
            abort ();
          }

        warning ("duplicate unary operator '%s' for type '%s'",
                 op_name.c_str (), type_name.c_str ());
      }

    non_const_unary_ops.checkelem (static_cast<int> (op), t)
      = reinterpret_cast<void *> (f);

    return false;
  }

  bool
  type_info::register_binary_class_op (octave_value::binary_op op,
                                       type_info::binary_class_op_fcn f,
                                       bool abort_on_duplicate)
  {
    if (lookup_binary_class_op (op))
      {
        std::string op_name = octave_value::binary_op_as_string (op);

        if (abort_on_duplicate)
          {

            std::cerr << "duplicate binary operator '" << op_name
                      << "' for class dispatch" << std::endl;
            abort ();
          }

        warning ("duplicate binary operator '%s' for class dispatch",
                 op_name.c_str ());
      }

    binary_class_ops.checkelem (static_cast<int> (op))
      = reinterpret_cast<void *> (f);

    return false;
  }

  bool type_info::register_binary_op (octave_value::binary_op op,
                                      int t1, int t2,
                                      type_info::binary_op_fcn f,
                                      bool abort_on_duplicate)
  {
    if (lookup_binary_op (op, t1, t2))
      {
        std::string op_name = octave_value::binary_op_as_string (op);
        std::string t1_name = types(t1);
        std::string t2_name = types(t2);

        if (abort_on_duplicate)
          {
            std::cerr << "duplicate binary operator '" << op_name
                      << "' for types '" << t1_name << "' and '"
                      << t2_name << "'" << std::endl;
            abort ();
          }

        warning ("duplicate binary operator '%s' for types '%s' and '%s'",
                 op_name.c_str (), t1_name.c_str (), t1_name.c_str ());
      }

    binary_ops.checkelem (static_cast<int> (op), t1, t2)
      = reinterpret_cast<void *> (f);

    return false;
  }

  bool
  type_info::register_binary_class_op (octave_value::compound_binary_op op,
                                       type_info::binary_class_op_fcn f,
                                       bool abort_on_duplicate)
  {
    if (lookup_binary_class_op (op))
      {
        std::string op_name = octave_value::binary_op_fcn_name (op);

        if (abort_on_duplicate)
          {
            std::cerr << "duplicate compound binary operator '"
                      << op_name << "' for class dispatch" << std::endl;
            abort ();
          }

        warning ("duplicate compound binary operator '%s' for class dispatch",
                 op_name.c_str ());
      }

    compound_binary_class_ops.checkelem (static_cast<int> (op))
      = reinterpret_cast<void *> (f);

    return false;
  }

  bool type_info::register_binary_op (octave_value::compound_binary_op op,
                                      int t1, int t2,
                                      type_info::binary_op_fcn f,
                                      bool abort_on_duplicate)
  {
    if (lookup_binary_op (op, t1, t2))
      {
        std::string op_name = octave_value::binary_op_fcn_name (op);
        std::string t1_name = types(t1);
        std::string t2_name = types(t2);

        if (abort_on_duplicate)
          {
            std::cerr << "duplicate compound binary operator '"
                      << op_name << "' for types '" << t1_name
                      << "' and '" << t2_name << "'" << std::endl;
            abort ();
          }

        warning ("duplicate compound binary operator '%s' for types '%s' and '%s'",
                 op_name.c_str (), t1_name.c_str (), t1_name.c_str ());
      }

    compound_binary_ops.checkelem (static_cast<int> (op), t1, t2)
      = reinterpret_cast<void *> (f);

    return false;
  }

  bool type_info::register_cat_op (int t1, int t2, type_info::cat_op_fcn f,
                                   bool abort_on_duplicate)
  {
    if (lookup_cat_op (t1, t2))
      {
        std::string t1_name = types(t1);
        std::string t2_name = types(t2);

        if (abort_on_duplicate)
          {
            std::cerr << "duplicate concatenation operator for types '"
                      << t1_name << "' and '" << t2_name << "'" << std::endl;
            abort ();
          }

        warning ("duplicate concatenation operator for types '%s' and '%s'",
                 t1_name.c_str (), t1_name.c_str ());
      }

    cat_ops.checkelem (t1, t2) = reinterpret_cast<void *> (f);

    return false;
  }

  bool type_info::register_assign_op (octave_value::assign_op op,
                                      int t_lhs, int t_rhs,
                                      type_info::assign_op_fcn f,
                                      bool abort_on_duplicate)
  {
    if (lookup_assign_op (op, t_lhs, t_rhs))
      {
        std::string op_name = octave_value::assign_op_as_string (op);
        std::string t_lhs_name = types(t_lhs);
        std::string t_rhs_name = types(t_rhs);

        if (abort_on_duplicate)
          {
            std::cerr << "duplicate assignment operator '"
                      << op_name << "' for types '" << t_lhs_name
                      << "' and '" << t_rhs_name << "'" << std::endl;
            abort ();
          }

        warning ("duplicate assignment operator '%s' for types '%s' and '%s'",
                 op_name.c_str (), t_lhs_name.c_str (), t_rhs_name.c_str ());
      }

    assign_ops.checkelem (static_cast<int> (op), t_lhs, t_rhs)
      = reinterpret_cast<void *> (f);

    return false;
  }

  bool type_info::register_assignany_op (octave_value::assign_op op, int t_lhs,
                                         type_info::assignany_op_fcn f,
                                         bool abort_on_duplicate)
  {
    if (lookup_assignany_op (op, t_lhs))
      {
        std::string op_name = octave_value::assign_op_as_string (op);
        std::string t_lhs_name = types(t_lhs);

        if (abort_on_duplicate)
          {
            std::cerr << "duplicate assignment operator '" << op_name
                      << "' for types '" << t_lhs_name << "'" << std::endl;
            abort ();
          }

        warning ("duplicate assignment operator '%s' for types '%s'",
                 op_name.c_str (), t_lhs_name.c_str ());
      }

    assignany_ops.checkelem (static_cast<int> (op), t_lhs)
      = reinterpret_cast<void *> (f);

    return false;
  }

  bool type_info::register_pref_assign_conv (int t_lhs, int t_rhs,
                                             int t_result,
                                             bool abort_on_duplicate)
  {
    if (lookup_pref_assign_conv (t_lhs, t_rhs) >= 0)
      {
        std::string t_lhs_name = types(t_lhs);
        std::string t_rhs_name = types(t_rhs);

        if (abort_on_duplicate)
          {
            std::cerr << "overriding assignment conversion for types '"
                      << t_lhs_name << "' and '" << t_rhs_name << "'"
                      << std::endl;
            abort ();
          }

        warning ("overriding assignment conversion for types '%s' and '%s'",
                 t_lhs_name.c_str (), t_rhs_name.c_str ());
      }

    pref_assign_conv.checkelem (t_lhs, t_rhs) = t_result;

    return false;
  }

  bool type_info::register_widening_op (int t, int t_result,
                                        octave_base_value::type_conv_fcn f,
                                        bool abort_on_duplicate)
  {
    if (lookup_widening_op (t, t_result))
      {
        std::string t_name = types(t);
        std::string t_result_name = types(t_result);

        if (abort_on_duplicate)
          {
            std::cerr << "overriding widening op for '" << t_name
                      << "' to '" << t_result_name << "'" << std::endl;
            abort ();
          }

        warning ("overriding widening op for '%s' to '%s'",
                 t_name.c_str (), t_result_name.c_str ());
      }

    widening_ops.checkelem (t, t_result) = reinterpret_cast<void *> (f);

    return false;
  }

  octave_value type_info::lookup_type (const std::string& nm)
  {
    octave_value retval;

    for (int i = 0; i < num_types; i++)
      {
        if (nm == types(i))
          {
            retval = *vals(i);
            retval.make_unique ();
            break;
          }
      }

    return retval;
  }

  type_info::unary_class_op_fcn
  type_info::lookup_unary_class_op (octave_value::unary_op op)
  {
    void *f = unary_class_ops.checkelem (static_cast<int> (op));
    return reinterpret_cast<type_info::unary_class_op_fcn> (f);
  }

  type_info::unary_op_fcn
  type_info::lookup_unary_op (octave_value::unary_op op, int t)
  {
    void *f = unary_ops.checkelem (static_cast<int> (op), t);
    return reinterpret_cast<type_info::unary_op_fcn> (f);
  }

  type_info::non_const_unary_op_fcn
  type_info::lookup_non_const_unary_op (octave_value::unary_op op, int t)
  {
    void *f = non_const_unary_ops.checkelem (static_cast<int> (op), t);
    return reinterpret_cast<type_info::non_const_unary_op_fcn> (f);
  }

  type_info::binary_class_op_fcn
  type_info::lookup_binary_class_op (octave_value::binary_op op)
  {
    void *f = binary_class_ops.checkelem (static_cast<int> (op));
    return reinterpret_cast<type_info::binary_class_op_fcn> (f);
  }

  type_info::binary_op_fcn
  type_info::lookup_binary_op (octave_value::binary_op op, int t1, int t2)
  {
    void *f = binary_ops.checkelem (static_cast<int> (op), t1, t2);
    return reinterpret_cast<type_info::binary_op_fcn> (f);
  }

  type_info::binary_class_op_fcn
  type_info::lookup_binary_class_op (octave_value::compound_binary_op op)
  {
    void *f = compound_binary_class_ops.checkelem (static_cast<int> (op));
    return reinterpret_cast<type_info::binary_class_op_fcn> (f);
  }

  type_info::binary_op_fcn
  type_info::lookup_binary_op (octave_value::compound_binary_op op,
                               int t1, int t2)
  {
    void *f = compound_binary_ops.checkelem (static_cast<int> (op), t1, t2);
    return reinterpret_cast<type_info::binary_op_fcn> (f);
  }

  type_info::cat_op_fcn
  type_info::lookup_cat_op (int t1, int t2)
  {
    void *f = cat_ops.checkelem (t1, t2);
    return reinterpret_cast<type_info::cat_op_fcn> (f);
  }

  type_info::assign_op_fcn
  type_info::lookup_assign_op (octave_value::assign_op op,
                               int t_lhs, int t_rhs)
  {
    void *f = assign_ops.checkelem (static_cast<int> (op), t_lhs, t_rhs);
    return reinterpret_cast<type_info::assign_op_fcn> (f);
  }

  type_info::assignany_op_fcn
  type_info::lookup_assignany_op (octave_value::assign_op op, int t_lhs)
  {
    void *f = assignany_ops.checkelem (static_cast<int> (op), t_lhs);
    return reinterpret_cast<type_info::assignany_op_fcn> (f);
  }

  int
  type_info::lookup_pref_assign_conv (int t_lhs, int t_rhs)
  {
    return pref_assign_conv.checkelem (t_lhs, t_rhs);
  }

  octave_base_value::type_conv_fcn
  type_info::lookup_widening_op (int t, int t_result)
  {
    void *f = widening_ops.checkelem (t, t_result);
    return reinterpret_cast<octave_base_value::type_conv_fcn> (f);
  }

  string_vector
  type_info::installed_type_names (void) const
  {
    string_vector retval (num_types);

    for (int i = 0; i < num_types; i++)
      retval(i) = types(i);

    return retval;
  }

  octave_scalar_map
  type_info::unary_ops_map (void) const
  {
    octave_scalar_map retval;

    int len = std::min (static_cast<int> (non_const_unary_ops.columns ()),
                        num_types);

    dim_vector tab_dims (1, len);

    for (int j = 0; j < octave_value::num_unary_ops; j++)
      {
        boolNDArray tab (tab_dims);

        for (int i = 0; i < len; i++)
          tab.xelem (i) = (unary_ops(j,i) != nullptr);

        octave_value::unary_op op_id = static_cast<octave_value::unary_op> (j);

        retval.setfield (octave_value::unary_op_as_string (op_id), tab);
      }

    return retval;
  }

  octave_scalar_map
  type_info::non_const_unary_ops_map (void) const
  {
    octave_scalar_map retval;

    int len = std::min (static_cast<int> (non_const_unary_ops.columns ()),
                        num_types);

    dim_vector tab_dims (1, len);

    for (int j = 0; j < octave_value::num_unary_ops; j++)
      {
        boolNDArray tab (tab_dims);

        for (int i = 0; i < len; i++)
          tab.xelem (i) = (non_const_unary_ops(j,i) != nullptr);

        octave_value::unary_op op_id = static_cast<octave_value::unary_op> (j);

        retval.setfield (octave_value::unary_op_as_string (op_id), tab);
      }

    return retval;
  }

  octave_scalar_map
  type_info::binary_ops_map (void) const
  {
    octave_scalar_map retval;

    int len = std::min (static_cast<int> (binary_ops.columns ()), num_types);

    dim_vector tab_dims (len, len);

    for (int k = 0; k < octave_value::num_binary_ops; k++)
      {
        boolNDArray tab (tab_dims);

        for (int j = 0; j < len; j++)
          for (int i = 0; i < len; i++)
            tab.xelem (j,i) = (binary_ops(k,j,i) != nullptr);

        octave_value::binary_op op_id = static_cast<octave_value::binary_op> (k);

        retval.setfield (octave_value::binary_op_as_string (op_id), tab);
      }

    return retval;
  }

  octave_scalar_map
  type_info::compound_binary_ops_map (void) const
  {
    octave_scalar_map retval;

    int len = std::min (static_cast<int> (compound_binary_ops.columns ()),
                        num_types);

    dim_vector tab_dims (len, len);

    for (int k = 0; k < octave_value::num_compound_binary_ops; k++)
      {
        boolNDArray tab (tab_dims);

        for (int j = 0; j < len; j++)
          for (int i = 0; i < len; i++)
            tab.xelem (j,i) = (compound_binary_ops(k,j,i) != nullptr);

        octave_value::compound_binary_op op_id
          = static_cast<octave_value::compound_binary_op> (k);

        retval.setfield (octave_value::binary_op_fcn_name (op_id), tab);
      }

    return retval;
  }

  octave_scalar_map
  type_info::assign_ops_map (void) const
  {
    octave_scalar_map retval;

    int len = std::min (static_cast<int> (assign_ops.columns ()), num_types);

    dim_vector tab_dims (len, len);

    for (int k = 0; k < octave_value::num_assign_ops; k++)
      {
        boolNDArray tab (tab_dims);

        for (int j = 0; j < len; j++)
          for (int i = 0; i < len; i++)
            tab.xelem (j,i) = (assign_ops(k,j,i) != nullptr);

        octave_value::assign_op op_id = static_cast<octave_value::assign_op> (k);

        retval.setfield (octave_value::assign_op_as_string (op_id), tab);
      }

    return retval;
  }

  octave_scalar_map
  type_info::assignany_ops_map (void) const
  {
    octave_scalar_map retval;

    int len = std::min (static_cast<int> (assignany_ops.columns ()), num_types);

    dim_vector tab_dims (1, len);

    for (int j = 0; j < octave_value::num_assign_ops; j++)
      {
        boolNDArray tab (tab_dims);

        for (int i = 0; i < len; i++)
          tab.xelem (i) = (assignany_ops(j,i) != nullptr);

        octave_value::assign_op op_id = static_cast<octave_value::assign_op> (j);

        retval.setfield (octave_value::assign_op_as_string (op_id), tab);
      }

    return retval;
  }

  octave_scalar_map
  type_info::installed_type_info (void) const
  {
    octave_scalar_map retval;

    retval.setfield ("types", octave_value (Cell (installed_type_names ())));
    retval.setfield ("unary_ops", unary_ops_map ());
    retval.setfield ("non_const_unary_ops", non_const_unary_ops_map ());
    retval.setfield ("binary_ops", binary_ops_map ());
    retval.setfield ("compound_binary_ops", compound_binary_ops_map ());
    retval.setfield ("cat_ops", as_bool_nd_array (cat_ops));
    retval.setfield ("assign_ops", assign_ops_map ());
    retval.setfield ("assignany_ops", assignany_ops_map ());
    retval.setfield ("pref_assign_conv", as_nd_array (pref_assign_conv));
    retval.setfield ("widening_ops", as_bool_nd_array (widening_ops));

    return retval;
  }
}

namespace octave_value_typeinfo
{
  int register_type (const std::string& t_name, const std::string& c_name,
                     const octave_value& val)
  {
    octave::type_info& type_info
      = octave::__get_type_info__ ("register_type");

    return type_info.register_type (t_name, c_name, val);
  }

  octave_value lookup_type (const std::string& nm)
  {
    octave::type_info& type_info
      = octave::__get_type_info__ ("lookup_type");

    return type_info.lookup_type (nm);
  }

  unary_class_op_fcn lookup_unary_class_op (octave_value::unary_op op)
  {
    octave::type_info& type_info
      = octave::__get_type_info__ ("lookup_unary_class_op");

    return type_info.lookup_unary_class_op (op);
  }

  unary_op_fcn lookup_unary_op (octave_value::unary_op op, int t)
  {
    octave::type_info& type_info
      = octave::__get_type_info__ ("lookup_unary_op");

    return type_info.lookup_unary_op (op, t);
  }

  non_const_unary_op_fcn
  lookup_non_const_unary_op (octave_value::unary_op op, int t)
  {
    octave::type_info& type_info
      = octave::__get_type_info__ ("lookup_non_const_unary_op");

    return type_info.lookup_non_const_unary_op (op, t);
  }

  binary_class_op_fcn
  lookup_binary_class_op (octave_value::binary_op op)
  {
    octave::type_info& type_info
      = octave::__get_type_info__ ("lookup_binary_class_op");

    return type_info.lookup_binary_class_op (op);
  }

  binary_op_fcn
  lookup_binary_op (octave_value::binary_op op, int t1, int t2)
  {
    octave::type_info& type_info
      = octave::__get_type_info__ ("lookup_binary_op");

    return type_info.lookup_binary_op (op, t1, t2);
  }

  binary_class_op_fcn
  lookup_binary_class_op (octave_value::compound_binary_op op)
  {
    octave::type_info& type_info
      = octave::__get_type_info__ ("lookup_binary_class_op");

    return type_info.lookup_binary_class_op (op);
  }

  binary_op_fcn
  lookup_binary_op (octave_value::compound_binary_op op, int t1, int t2)
  {
    octave::type_info& type_info
      = octave::__get_type_info__ ("lookup_binary_op");

    return type_info.lookup_binary_op (op, t1, t2);
  }

  cat_op_fcn lookup_cat_op (int t1, int t2)
  {
    octave::type_info& type_info
      = octave::__get_type_info__ ("lookup_cat_op");

    return type_info.lookup_cat_op (t1, t2);
  }

  assign_op_fcn
  lookup_assign_op (octave_value::assign_op op, int t_lhs, int t_rhs)
  {
    octave::type_info& type_info
      = octave::__get_type_info__ ("lookup_assign_op");

    return type_info.lookup_assign_op (op, t_lhs, t_rhs);
  }

  assignany_op_fcn
  lookup_assignany_op (octave_value::assign_op op, int t_lhs)
  {
    octave::type_info& type_info
      = octave::__get_type_info__ ("lookup_assignany_op");

    return type_info.lookup_assignany_op (op, t_lhs);
  }

  int lookup_pref_assign_conv (int t_lhs, int t_rhs)
  {
    octave::type_info& type_info
      = octave::__get_type_info__ ("lookup_pref_assign_conv");

    return type_info.lookup_pref_assign_conv (t_lhs, t_rhs);
  }

  octave_base_value::type_conv_fcn
  lookup_widening_op (int t, int t_result)
  {
    octave::type_info& type_info
      = octave::__get_type_info__ ("lookup_widening_op");

    return type_info.lookup_widening_op (t, t_result);
  }

  string_vector installed_type_names (void)
  {
    octave::type_info& type_info
      = octave::__get_type_info__ ("installed_type_names");

    return type_info.installed_type_names ();
  }

  octave_scalar_map installed_type_info (void)
  {
    octave::type_info& type_info
      = octave::__get_type_info__ ("installed_type_info");

    return type_info.installed_type_info ();
  }
}

DEFMETHOD (typeinfo, interp, args, ,
           doc: /* -*- texinfo -*-
@deftypefn  {} {} typeinfo ()
@deftypefnx {} {} typeinfo (@var{expr})

Return the type of the expression @var{expr}, as a string.

If @var{expr} is omitted, return a cell array of strings containing all the
currently installed data types.
@seealso{class, isa}
@end deftypefn */)
{
  int nargin = args.length ();

  if (nargin > 1)
    print_usage ();

  if (nargin == 0)
    {
      octave::type_info& type_info = interp.get_type_info ();

      return ovl (Cell (type_info.installed_type_names ()));
    }
  else
    return ovl (args(0).type_name ());
}

/*
%!assert (iscellstr (typeinfo ()))

%!assert (typeinfo ({"cell"}), "cell")

%!assert (typeinfo (1), "scalar")
%!assert (typeinfo (double (1)), "scalar")
%!assert (typeinfo (i), "complex scalar")

%!assert (typeinfo ([1, 2]), "matrix")
%!assert (typeinfo (double ([1, 2])), "matrix")
%!assert (typeinfo (diag ([1, 2])), "diagonal matrix")
%!assert (typeinfo ([i, 2]), "complex matrix")
%!assert (typeinfo (diag ([i, 2])), "complex diagonal matrix")

%!assert (typeinfo (1:2), "range")

%!assert (typeinfo (false), "bool")
%!assert (typeinfo ([true, false]), "bool matrix")

%!assert (typeinfo ("string"), "string")
%!assert (typeinfo ('string'), "sq_string")

%!assert (typeinfo (int8 (1)), "int8 scalar")
%!assert (typeinfo (int16 (1)), "int16 scalar")
%!assert (typeinfo (int32 (1)), "int32 scalar")
%!assert (typeinfo (int64 (1)), "int64 scalar")
%!assert (typeinfo (uint8 (1)), "uint8 scalar")
%!assert (typeinfo (uint16 (1)), "uint16 scalar")
%!assert (typeinfo (uint32 (1)), "uint32 scalar")
%!assert (typeinfo (uint64 (1)), "uint64 scalar")

%!assert (typeinfo (int8 ([1,2])), "int8 matrix")
%!assert (typeinfo (int16 ([1,2])), "int16 matrix")
%!assert (typeinfo (int32 ([1,2])), "int32 matrix")
%!assert (typeinfo (int64 ([1,2])), "int64 matrix")
%!assert (typeinfo (uint8 ([1,2])), "uint8 matrix")
%!assert (typeinfo (uint16 ([1,2])), "uint16 matrix")
%!assert (typeinfo (uint32 ([1,2])), "uint32 matrix")
%!assert (typeinfo (uint64 ([1,2])), "uint64 matrix")

%!assert (typeinfo (sparse ([true, false])), "sparse bool matrix")
%!assert (typeinfo (logical (sparse (i * eye (10)))), "sparse bool matrix")
%!assert (typeinfo (sparse ([1,2])), "sparse matrix")
%!assert (typeinfo (sparse (eye (10))), "sparse matrix")
%!assert (typeinfo (sparse ([i,2])), "sparse complex matrix")
%!assert (typeinfo (sparse (i * eye (10))), "sparse complex matrix")

%!test
%! s(2).a = 1;
%! assert (typeinfo (s), "struct");

%!test
%! s.a = 1;
%! assert (typeinfo (s), "scalar struct");

## FIXME: This doesn't work as a test for comma-separated list
%!#test
%! clist = {1, 2, 3};
%! assert (typeinfo (clist{:}), "cs-list");

%!assert (typeinfo (@sin), "function handle")
%!assert (typeinfo (@(x) x), "function handle")

%!assert (typeinfo (single (1)), "float scalar")
%!assert (typeinfo (single (i)), "float complex scalar")
%!assert (typeinfo (single ([1, 2])), "float matrix")

%!assert (typeinfo (single (diag ([1, 2]))), "float diagonal matrix")
%!assert (typeinfo (diag (single ([1, 2]))), "float diagonal matrix")
%!assert (typeinfo (single (diag ([i, 2]))), "float complex diagonal matrix")
%!assert (typeinfo (diag (single ([i, 2]))), "float complex diagonal matrix")

%!assert (typeinfo (eye(3)(:,[1 3 2])), "permutation matrix")
%!test
%! [l, u, p] = lu (rand (3));
%! assert (typeinfo (p), "permutation matrix");

%!assert (typeinfo ([]), "null_matrix")
%!assert (typeinfo (""), "null_string")
%!assert (typeinfo (''), "null_sq_string")

%!test
%! cvar = onCleanup (@() "");
%! assert (typeinfo (cvar), "onCleanup");

%!testif HAVE_JAVA; usejava ("jvm")
%! x = javaObject ("java.lang.StringBuffer");
%! assert (typeinfo (x), "octave_java");

## Test input validation
%!error typeinfo ("foo", 1)
*/

DEFMETHOD (__dump_typeinfo__, interp, args, ,
           doc: /* -*- texinfo -*-
@deftypefn {} {} __dump_typeinfo__ ()
Undocumented internal function.
@end deftypefn */)
{
  if (args.length () > 0)
    print_usage ();

  octave::type_info& type_info = interp.get_type_info ();

  return ovl (type_info.installed_type_info ());
}