/*

Copyright (C) 2004 David Bateman

This program 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 2, or (at your option)
any later version.

This program 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, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.

In addition to the terms of the GPL, you are permitted to link
this program with any Open Source program, as defined by the
Open Source Initiative (www.opensource.org)

*/

#if defined (__GNUG__) && defined (USE_PRAGMA_INTERFACE_IMPLEMENTATION)
#pragma implementation
#endif

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

#include <istream>
#include <iostream>

#include "defun.h"
#include "error.h"
#include "gripes.h"
#include "oct-map.h"
#include "ov-base.h"
#include "ov-fcn-inline.h"
#include "pr-output.h"
#include "variables.h"
#include "parse.h"

#include "byte-swap.h"
#include "ls-oct-ascii.h"
#include "ls-hdf5.h"
#include "ls-utils.h"

DEFINE_OCTAVE_ALLOCATOR (octave_fcn_inline);

DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_fcn_inline,
				     "inline function",
				     "inline function");

octave_fcn_inline::octave_fcn_inline (const std::string& f,
				      const string_vector& a,
				      const std::string& n)
  : octave_fcn_handle (n), iftext (f), ifargs (a)
{
  // Form a string representing the function.

  OSSTREAM buf;

  buf << "@(";

  for (int i = 0; i < ifargs.length (); i++)
    {
      if (i > 0)
	buf << ", ";

      buf << ifargs(i);
    }

  buf << ") " << iftext << OSSTREAM_ENDS;

  int parse_status;
  octave_value anon_fcn_handle = eval_string (OSSTREAM_STR (buf), true,
					      parse_status);

  OSSTREAM_FREEZE (buf);

  if (parse_status == 0)
    {
      octave_fcn_handle *fh = anon_fcn_handle.fcn_handle_value ();

      if (fh)
	fcn = fh->fcn_val ();
    }

  if (fcn.is_undefined ())
    error ("inline: unable to define function");
}

bool
octave_fcn_inline::save_ascii (std::ostream& os, bool&, bool)
{
  os << "# nargs: " <<  ifargs.length () << "\n";
  for (int i = 0; i < ifargs.length (); i++)
    os << ifargs(i) << "\n";
  if (nm.length () < 1)
    // Write an invalid value to flag empty fcn handle name.
    os << "0\n";
  else
    os << nm << "\n";
  os << iftext << "\n";
  return true;
}

bool
octave_fcn_inline::load_ascii (std::istream& is)
{
  int nargs;
  if (extract_keyword (is, "nargs", nargs, true))
    {
      ifargs.resize (nargs);
      for (int i = 0; i < nargs; i++)
	is >> ifargs(i);
      is >> nm;
      if (nm == "0")
	nm = "";

      char c;
      OSSTREAM buf;

      // Skip preceeding newline(s)
      while (is.get (c) && c == '\n');

      if (is)
	{
	  buf << c;

	  // Get a line of text whitespace characters included, leaving
	  // newline in the stream
	  while (is.peek () != '\n')
	    {
	      is.get (c);
	      if (! is)
		break;
	      buf << c;
	    }
	}

      buf << OSSTREAM_ENDS;
      iftext = OSSTREAM_STR (buf);
      OSSTREAM_FREEZE (buf);

      octave_fcn_inline tmp (iftext, ifargs, nm);
      fcn = tmp.fcn;

      return true;
    }
  else
    return false;
}

bool
octave_fcn_inline::save_binary (std::ostream& os, bool&)
{
  FOUR_BYTE_INT tmp = ifargs.length ();
  os.write (X_CAST (char *, &tmp), 4);
  for (int i = 0; i < ifargs.length (); i++)
    {
      tmp = ifargs(i).length ();
      os.write (X_CAST (char *, &tmp), 4);
      os.write (ifargs(i).c_str (), ifargs(i).length ());
    }
  tmp = nm.length ();
  os.write (X_CAST (char *, &tmp), 4);
  os.write (nm.c_str (), nm.length ());
  tmp = iftext.length ();
  os.write (X_CAST (char *, &tmp), 4);
  os.write (iftext.c_str (), iftext.length ());
  return true;
}

bool
octave_fcn_inline::load_binary (std::istream& is, bool swap,
				oct_mach_info::float_format)
{
  FOUR_BYTE_INT nargs;
  if (! is.read (X_CAST (char *, &nargs), 4))
    return false;
  if (swap)
    swap_bytes<4> (&nargs);

  if (nargs < 1)
    return false;
  else
    {
      FOUR_BYTE_INT tmp;
      ifargs.resize (nargs);
      for (int i = 0; i < nargs; i++)
	{
	  if (! is.read (X_CAST (char *, &tmp), 4))
	    return false;
	  if (swap)
	    swap_bytes<4> (&tmp);

	  OCTAVE_LOCAL_BUFFER (char, ctmp, tmp+1);
	  is.read (ctmp, tmp);
	  ifargs(i) = std::string (ctmp);

	  if (! is)
	    return false;
	}

      if (! is.read (X_CAST (char *, &tmp), 4))
	return false;
      if (swap)
	swap_bytes<4> (&tmp);

      OCTAVE_LOCAL_BUFFER (char, ctmp1, tmp+1);
      is.read (ctmp1, tmp);
      nm = std::string (ctmp1);

      if (! is)
	return false;

      if (! is.read (X_CAST (char *, &tmp), 4))
	return false;
      if (swap)
	swap_bytes<4> (&tmp);

      OCTAVE_LOCAL_BUFFER (char, ctmp2, tmp+1);
      is.read (ctmp2, tmp);
      iftext = std::string (ctmp2);

      if (! is)
	return false;

      octave_fcn_inline ftmp (iftext, ifargs, nm);
      fcn = ftmp.fcn;
    }
  return true;
}

#if defined (HAVE_HDF5)
bool
octave_fcn_inline::save_hdf5 (hid_t loc_id, const char *name,
			      bool /* save_as_floats */)
{
  hid_t group_hid = -1;
  group_hid = H5Gcreate (loc_id, name, 0);
  if (group_hid < 0 ) return false;

  size_t len = 0;
  for (int i = 0; i < ifargs.length (); i++)
    if (len < ifargs(i).length ())
      len = ifargs(i).length ();

  hid_t space_hid = -1, data_hid = -1, type_hid = -1;;
  bool retval = true;

  // XXX FIXME XXX Is there a better way of saving string vectors, than a
  // null padded matrix?

  OCTAVE_LOCAL_BUFFER (hsize_t, hdims, 2);

  // Octave uses column-major, while HDF5 uses row-major ordering
  hdims[1] = ifargs.length ();
  hdims[0] = len + 1;

  space_hid = H5Screate_simple (2, hdims, 0);
  if (space_hid < 0)
    {
      H5Gclose (group_hid);
      return false;
    }

  data_hid = H5Dcreate (group_hid, "args", H5T_NATIVE_CHAR, space_hid,
			H5P_DEFAULT);
  if (data_hid < 0)
    {
      H5Sclose (space_hid);
      H5Gclose (group_hid);
      return false;
    }

  OCTAVE_LOCAL_BUFFER (char, s, ifargs.length () * (len + 1));

  // Save the args as a null teminated list
  for (int i = 0; i < ifargs.length (); i++)
    {
      const char * cptr = ifargs(i).c_str ();
      for (size_t j = 0; j < ifargs(i).length (); j++)
	s[i*(len+1)+j] = *cptr++;
      s[ifargs(i).length ()] = '\0';
    }

  retval = H5Dwrite (data_hid, H5T_NATIVE_CHAR, H5S_ALL, H5S_ALL,
		     H5P_DEFAULT, s) >= 0;

  H5Dclose (data_hid);
  H5Sclose (space_hid);

  if (!retval)
    {
      H5Gclose (group_hid);
      return false;
    }

  // attach the type of the variable
  type_hid = H5Tcopy (H5T_C_S1);
  H5Tset_size (type_hid, nm.length () + 1);
  if (type_hid < 0)
    {
      H5Gclose (group_hid);
      return false;
    }

  hdims[0] = 0;
  space_hid = H5Screate_simple (0 , hdims, (hsize_t*) 0);
  if (space_hid < 0)
    {
      H5Tclose (type_hid);
      H5Gclose (group_hid);
      return false;
    }

  data_hid = H5Dcreate (group_hid, "nm",  type_hid, space_hid, H5P_DEFAULT);
  if (data_hid < 0 || H5Dwrite (data_hid, type_hid, H5S_ALL, H5S_ALL,
				H5P_DEFAULT, (void*) nm.c_str ()) < 0)
    {
      H5Sclose (space_hid);
      H5Tclose (type_hid);
      H5Gclose (group_hid);
      return false;
    }
  H5Dclose (data_hid);

  // attach the type of the variable
  H5Tset_size (type_hid, iftext.length () + 1);
  if (type_hid < 0)
    {
      H5Gclose (group_hid);
      return false;
    }

  data_hid = H5Dcreate (group_hid, "iftext",  type_hid, space_hid,
			H5P_DEFAULT);
  if (data_hid < 0 || H5Dwrite (data_hid, type_hid, H5S_ALL, H5S_ALL,
				H5P_DEFAULT, (void*) iftext.c_str ()) < 0)
    {
      H5Sclose (space_hid);
      H5Tclose (type_hid);
      H5Gclose (group_hid);
      return false;
    }

  H5Dclose (data_hid);
  H5Sclose (space_hid);
  H5Tclose (type_hid);
  H5Gclose (group_hid);

  return retval;
}

bool
octave_fcn_inline::load_hdf5 (hid_t loc_id, const char *name,
			      bool /* have_h5giterate_bug */)
{
  hid_t group_hid, data_hid, space_hid, type_hid, type_class_hid, st_id;
  hsize_t rank;
  int slen;

  group_hid = H5Gopen (loc_id, name);
  if (group_hid < 0 ) return false;

  data_hid = H5Dopen (group_hid, "args");
  space_hid = H5Dget_space (data_hid);
  rank = H5Sget_simple_extent_ndims (space_hid);

  if (rank != 2)
    {
      H5Dclose (data_hid);
      H5Sclose (space_hid);
      H5Gclose (group_hid);
      return false;
    }

  OCTAVE_LOCAL_BUFFER (hsize_t, hdims, rank);
  OCTAVE_LOCAL_BUFFER (hsize_t, maxdims, rank);

  H5Sget_simple_extent_dims (space_hid, hdims, maxdims);

  ifargs.resize (hdims[1]);

  OCTAVE_LOCAL_BUFFER (char, s1, hdims[0] * hdims[1]);

  if (H5Dread (data_hid, H5T_NATIVE_UCHAR, H5S_ALL, H5S_ALL,
	       H5P_DEFAULT, s1) < 0)
    {
      H5Dclose (data_hid);
      H5Sclose (space_hid);
      H5Gclose (group_hid);
      return false;
    }

  H5Dclose (data_hid);
  H5Sclose (space_hid);

  for (size_t i = 0; i < hdims[1]; i++)
    ifargs(i) = std::string (s1 + i*hdims[0]);

  data_hid = H5Dopen (group_hid, "nm");

  if (data_hid < 0)
    {
      H5Gclose (group_hid);
      return false;
    }

  type_hid = H5Dget_type (data_hid);
  type_class_hid = H5Tget_class (type_hid);

  if (type_class_hid != H5T_STRING)
    {
      H5Tclose (type_hid);
      H5Dclose (data_hid);
      H5Gclose (group_hid);
      return false;
    }

  space_hid = H5Dget_space (data_hid);
  rank = H5Sget_simple_extent_ndims (space_hid);

  if (rank != 0)
    {
      H5Sclose (space_hid);
      H5Tclose (type_hid);
      H5Dclose (data_hid);
      H5Gclose (group_hid);
      return false;
    }

  slen = H5Tget_size (type_hid);
  if (slen < 0)
    {
      H5Sclose (space_hid);
      H5Tclose (type_hid);
      H5Dclose (data_hid);
      H5Gclose (group_hid);
      return false;
    }

  OCTAVE_LOCAL_BUFFER (char, nm_tmp, slen);

  // create datatype for (null-terminated) string to read into:
  st_id = H5Tcopy (H5T_C_S1);
  H5Tset_size (st_id, slen);

  if (H5Dread (data_hid, st_id, H5S_ALL, H5S_ALL, H5P_DEFAULT,
	       X_CAST (void *, nm_tmp)) < 0)
    {
      H5Sclose (space_hid);
      H5Tclose (type_hid);
      H5Gclose (group_hid);
      return false;
    }
  H5Tclose (st_id);
  H5Dclose (data_hid);
  nm = nm_tmp;

  data_hid = H5Dopen (group_hid, "iftext");

  if (data_hid < 0)
    {
      H5Gclose (group_hid);
      return false;
    }

  type_hid = H5Dget_type (data_hid);
  type_class_hid = H5Tget_class (type_hid);

  if (type_class_hid != H5T_STRING)
    {
      H5Tclose (type_hid);
      H5Dclose (data_hid);
      H5Gclose (group_hid);
      return false;
    }

  space_hid = H5Dget_space (data_hid);
  rank = H5Sget_simple_extent_ndims (space_hid);

  if (rank != 0)
    {
      H5Sclose (space_hid);
      H5Tclose (type_hid);
      H5Dclose (data_hid);
      H5Gclose (group_hid);
      return false;
    }

  slen = H5Tget_size (type_hid);
  if (slen < 0)
    {
      H5Sclose (space_hid);
      H5Tclose (type_hid);
      H5Dclose (data_hid);
      H5Gclose (group_hid);
      return false;
    }

  OCTAVE_LOCAL_BUFFER (char, iftext_tmp, slen);

  // create datatype for (null-terminated) string to read into:
  st_id = H5Tcopy (H5T_C_S1);
  H5Tset_size (st_id, slen);

  if (H5Dread (data_hid, st_id, H5S_ALL, H5S_ALL, H5P_DEFAULT,
	       X_CAST (void *, iftext_tmp)) < 0)
    {
      H5Sclose (space_hid);
      H5Tclose (type_hid);
      H5Gclose (group_hid);
      return false;
    }
  H5Tclose (st_id);
  H5Dclose (data_hid);
  iftext = iftext_tmp;

  octave_fcn_inline ftmp (iftext, ifargs, nm);
  fcn = ftmp.fcn;

  return true;
}
#endif

void
octave_fcn_inline::print (std::ostream& os, bool pr_as_read_syntax) const
{
  print_raw (os, pr_as_read_syntax);
  newline (os);
}

void
octave_fcn_inline::print_raw (std::ostream& os, bool pr_as_read_syntax) const
{
  OSSTREAM buf;

  if (nm.empty ())
    buf << "f(";
  else
    buf << nm << "(";

  for (int i = 0; i < ifargs.length (); i++)
    {
      if (i)
	buf << ", ";

      buf << ifargs(i);
    }

  buf << ") = " << iftext << OSSTREAM_ENDS;

  octave_print_internal (os, OSSTREAM_STR (buf), pr_as_read_syntax,
			 current_print_indent_level ());
  OSSTREAM_FREEZE (buf);
}

octave_value
octave_fcn_inline::convert_to_str_internal (bool, bool) const
{
  return octave_value (fcn_text ());
}

DEFUN (inline, args, ,
  "-*- texinfo -*-\n\
@deftypefn {Built-in Function} {} inline (@var{str})\n\
@deftypefnx {Built-in Function} {} inline (@var{str}, @var{arg1}, ...)\n\
@deftypefnx {Built-in Function} {} inline (@var{str}, @var{n})\n\
Create an inline function from the character string @var{str}.\n\
If called with a single argument, the generated function is\n\
assumed to have a single argument and will be defined\n\
as the first isolated lower case character, except i or j.\n\
\n\
If the second and subsequent arguments are character strings,\n\
they are the names of the arguments of the function.\n\
\n\
If the second argument is an integer @var{n}, the arguments are\n\
@code{\"x\"}, @code{\"P1\"}, @dots{}, @code{\"P@var{N}\"}.\n\
@end deftypefn\n\
@seealso{argnames, formula, vectorize}")
{
  octave_value retval;

  int nargin = args.length ();

  if (nargin > 0)
    {
      std::string fun = args(0).string_value ();

      if (! error_state)
	{
	  string_vector fargs;

	  if (nargin == 1)
	    {
	      fargs.resize (1);

	      // Find the first isolated string as the argument of the
	      // function.

	      // XXX FIXME XXX -- use just "x" for now.
	      fargs(0) = "x";
	    }
	  else if (nargin == 2 && args(1).is_numeric_type ())
	    {
	      int n = args(1).int_value ();

	      if (! error_state)
		{
		  if (n >= 0)
		    {
		      fargs.resize (n+1);

		      fargs(0) = "x";

		      for (int i = 1; i < n+1; i++)
			{
			  OSSTREAM buf;
			  buf << "P" << i << OSSTREAM_ENDS;
			  fargs(i) = OSSTREAM_STR (buf);
			  OSSTREAM_FREEZE (buf);
			}
		    }
		  else
		    {
		      error ("inline: numeric argument must be nonnegative");
		      return retval;
		    }
		}
	      else
		{
		  error ("inline: expecting second argument to be an integer");
		  return retval;
		}
	    }
	  else
	    {
	      fargs.resize (nargin - 1);

	      for (int i = 1; i < nargin; i++)
		{
		  std::string s = args(i).string_value ();

		  if (! error_state)
		    fargs(i-1) = s;
		  else
		    {
		      error ("inline: expecting string arguments");
		      return retval;
		    }
		}
	    }

	  retval = octave_value (new octave_fcn_inline (fun, fargs));
	}
      else
	error ("inline: first argument must be a string");
    }
  else
    print_usage ("inline");

  return retval;
}

DEFUN (formula, args, ,
  "-*- texinfo -*-\n\
@deftypefn {Built-in Function} {} formula (@var{fun})\n\
Return a character string representing the inline function @var{fun}.\n\
Note that @code{char (@var{fun})} is equivalent to\n\
@code{formula (@var{fun})}.\n\
@end deftypefn\n\
@seealso{argnames, inline, vectorize}")
{
  octave_value retval;

  int nargin = args.length ();

  if (nargin == 1)
    {
      octave_fcn_inline* fn = args(0).fcn_inline_value (true);

      if (fn)
	retval = octave_value (fn->fcn_text ());
      else
	error ("formula: must be an inline function");
    }
  else
    print_usage ("formula");

  return retval;
}

DEFUN (argnames, args, ,
  "-*- texinfo -*-\n\
@deftypefn {Built-in Function} {} argnames (@var{fun})\n\
Return a cell array of character strings containing the names of\n\
the arguments of the inline function @var{fun}.\n\
@end deftypefn\n\
@seealso{argnames, inline, formula, vectorize}")
{
  octave_value retval;

  int nargin = args.length ();

  if (nargin == 1)
    {
      octave_fcn_inline *fn = args(0).fcn_inline_value (true);

      if (fn)
	{
	  string_vector t1 = fn->fcn_arg_names ();

	  Cell t2 (dim_vector (t1.length (), 1));

	  for (int i = 0; i < t1.length (); i++)
	    t2(i) = t1(i);

	  retval = t2;
	}
      else
	error ("argnames: argument must be an inline function");
    }
  else
    print_usage ("argnames");

  return retval;
}

DEFUN (vectorize, args, ,
  "-*- texinfo -*-\n\
@deftypefn {Built-in Function} {} argnames (@var{fun})\n\
Create a vectorized version of the inline function @var{fun}\n\
by replacing all occurrences of @code{*}, @code{/}, etc., with\n\
@code{.*}, @code{./}, etc.\n\
@end deftypefn\n\
@seealso{argnames, inline, formula, vectorize}")
{
  octave_value retval;

  int nargin = args.length ();

  if (nargin == 1)
    {
      octave_fcn_inline* old = args(0).fcn_inline_value (true);

      if (old)
	{
	  std::string old_func = old->fcn_text ();
	  std::string new_func;

	  size_t i = 0;

	  while (i < old_func.length ())
	    {
	      std::string t1 = old_func.substr (i, 1);

	      if (t1 == "*" || t1 == "/" || t1 == "\\" || t1 == "^")
		{
		  if (i && old_func.substr (i-1, 1) != ".")
		    new_func.append (".");

		  // Special case for ** operator.
		  if (t1 == "*" && i < (old_func.length () - 1)
		      && old_func.substr (i+1, 1) == "*")
		    {
		      new_func.append ("*");
		      i++;
		    }
		}
	      new_func.append (t1);
	      i++;
	    }

	  retval = octave_value (new octave_fcn_inline (new_func, old->fcn_arg_names ()));
	}
      else
	error ("vectorize: must be an inline function");
    }
  else
    print_usage ("vectorize");

  return retval;
}

/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; End: ***
*/