/*

Copyright (C) 1994-2011 John W. Eaton
Copyright (C) 2009 VZLU Prague

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/>.

*/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "error.h"
#include "oct-obj.h"
#include "Cell.h"

octave_value_list::octave_value_list (const std::list<octave_value_list>& lst)
{
  octave_idx_type n = 0, nel = 0;

  // Determine number.
  for (std::list<octave_value_list>::const_iterator p = lst.begin ();
       p != lst.end (); p++)
    {
      n++;
      nel += p->length ();
    }

  // Optimize single-element case
  if (n == 1)
    data = lst.front ().data;
  else if (nel > 0)
    {
      data.resize (1, nel);
      octave_idx_type k = 0;
      for (std::list<octave_value_list>::const_iterator p = lst.begin ();
           p != lst.end (); p++)
        {
          data.assign (idx_vector (k, k + p->length ()), p->data);
          k += p->length ();
        }
      assert (k == nel);
    }

}

octave_allocator
octave_value_list::allocator (sizeof (octave_value_list));

octave_value_list&
octave_value_list::prepend (const octave_value& val)
{
  octave_idx_type n = length ();

  resize (n + 1);

  while (n > 0)
    {
      elem (n) = elem (n - 1);
      n--;
    }

  elem (0) = val;
  
  return *this;
}

octave_value_list&
octave_value_list::append (const octave_value& val)
{
  octave_idx_type n = length ();

  resize (n + 1);

  elem (n) = val;

  return *this;
}

octave_value_list&
octave_value_list::append (const octave_value_list& lst)
{
  octave_idx_type len = length ();
  octave_idx_type lst_len = lst.length ();

  resize (len + lst_len);

  for (octave_idx_type i = 0; i < lst_len; i++)
    elem (len + i) = lst (i);

  return *this;
}

octave_value_list&
octave_value_list::reverse (void)
{
  octave_idx_type n = length ();

  for (octave_idx_type i = 0; i < n / 2; i++)
    {
      octave_value tmp = elem (i);
      elem (i) = elem (n - i - 1);
      elem (n - i - 1) = tmp;
    }

  return *this;
}

octave_value_list
octave_value_list::splice (octave_idx_type offset, octave_idx_type rep_length,
                           const octave_value_list& lst) const
{ 
  octave_value_list retval;

  octave_idx_type len = length ();

  if (offset < 0 || offset >= len)
    {
      if (! (rep_length == 0 && offset == len))
        {
          error ("octave_value_list::splice: invalid OFFSET");
          return retval;
        }
    }

  if (rep_length < 0 || rep_length + offset > len)
    {
      error ("octave_value_list::splice: invalid LENGTH");
      return retval;
    }

  octave_idx_type lst_len = lst.length ();

  octave_idx_type new_len = len - rep_length + lst_len;

  retval.resize (new_len);

  octave_idx_type k = 0;

  for (octave_idx_type i = 0; i < offset; i++)
    retval(k++) = elem (i);

  for (octave_idx_type i = 0; i < lst_len; i++)
    retval(k++) = lst(i);

  for (octave_idx_type i = offset + rep_length; i < len; i++)
    retval(k++) = elem (i);

  return retval;
}

bool
octave_value_list::all_strings_p (void) const
{
  octave_idx_type n = length ();

  for (octave_idx_type i = 0; i < n; i++)
    if (! elem(i).is_string ())
      return false;

  return true;
}

bool
octave_value_list::all_scalars (void) const
{
  octave_idx_type n = length (), i;

  for (i = 0; i < n && elem (i).is_string (); i++) ;
  
  return i == n;
}

bool
octave_value_list::any_cell (void) const
{
  octave_idx_type n = length ();

  for (octave_idx_type i = 0; i < n; i++)
    if (elem (i).is_cell ())
      return true;

  return false;
}

bool
octave_value_list::has_magic_colon (void) const
{
  octave_idx_type n = length ();

  for (octave_idx_type i = 0; i < n; i++)
    if (elem(i).is_magic_colon ())
      return true;

  return false;
}

string_vector
octave_value_list::make_argv (const std::string& fcn_name) const
{
  string_vector argv;

  if (all_strings_p ())
    {
      octave_idx_type len = length ();

      octave_idx_type total_nr = 0;

      for (octave_idx_type i = 0; i < len; i++)
        {
          // An empty std::string ("") has zero columns and zero rows (a
          // change that was made for Matlab contemptibility.

          octave_idx_type n = elem(i).rows ();

          total_nr += n ? n : 1;
        }

      octave_idx_type k = 0;
      if (! fcn_name.empty ())
        {
          argv.resize (total_nr+1);
          argv[0] = fcn_name;
          k = 1;
        }
      else
        argv.resize (total_nr);

      for (octave_idx_type i = 0; i < len; i++)
        {
          octave_idx_type nr = elem(i).rows ();

          if (nr < 2)
            argv[k++] = elem(i).string_value ();
          else
            {
              string_vector tmp = elem(i).all_strings ();

              for (octave_idx_type j = 0; j < nr; j++)
                argv[k++] = tmp[j];
            }
        }
    }
  else
    error ("%s: expecting all arguments to be strings", fcn_name.c_str ());

  return argv;
}

void
octave_value_list::make_storable_values (void)
{
  octave_idx_type len = length ();
  const Array<octave_value>& cdata = data;

  for (octave_idx_type i = 0; i < len; i++)
    {
      // This is optimized so that we don't force a copy unless necessary.
      octave_value tmp = cdata(i).storable_value ();
      if (! tmp.is_copy_of (cdata (i)))
        data(i) = tmp;
    }
}