/*

Copyright (C) 1993-2017 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_variables_h)
#define octave_variables_h 1

#include "octave-config.h"

class octave_function;
class octave_user_function;

class tree_identifier;
class octave_value;
class octave_value_list;
class octave_builtin;
class string_vector;

#include <cfloat>

#include <limits>
#include <string>

#include "lo-ieee.h"

#include "ov.h"
#include "ov-builtin.h"
#include "symtab.h"

extern OCTINTERP_API void clear_mex_functions (void);

extern OCTINTERP_API octave_function *
is_valid_function (const octave_value&, const std::string& = "",
                   bool warn = false);

extern OCTINTERP_API octave_function *
is_valid_function (const std::string&, const std::string& = "",
                   bool warn = false);

extern OCTINTERP_API octave_function *
extract_function (const octave_value& arg, const std::string& warn_for,
                  const std::string& fname, const std::string& header,
                  const std::string& trailer);

extern OCTINTERP_API string_vector
get_struct_elts (const std::string& text);

extern OCTINTERP_API string_vector
generate_struct_completions (const std::string& text, std::string& prefix,
                             std::string& hint);

extern OCTINTERP_API bool
looks_like_struct (const std::string& text, char prev_char);

extern OCTINTERP_API int
symbol_exist (const std::string& name, const std::string& type = "any");

extern OCTINTERP_API std::string
unique_symbol_name (const std::string& basename);

extern OCTINTERP_API octave_value
lookup_function_handle (const std::string& nm);

extern OCTINTERP_API octave_value
get_global_value (const std::string& nm, bool silent = false);

extern OCTINTERP_API void
set_global_value (const std::string& nm, const octave_value& val);

extern OCTINTERP_API octave_value
get_top_level_value (const std::string& nm, bool silent = false);

extern OCTINTERP_API void
set_top_level_value (const std::string& nm, const octave_value& val);

extern OCTINTERP_API octave_value
set_internal_variable (bool& var, const octave_value_list& args,
                       int nargout, const char *nm);

extern OCTINTERP_API octave_value
set_internal_variable (char& var, const octave_value_list& args,
                       int nargout, const char *nm);

extern OCTINTERP_API octave_value
set_internal_variable (int& var, const octave_value_list& args,
                       int nargout, const char *nm,
                       int minval = std::numeric_limits<int>::min (),
                       int maxval = std::numeric_limits<int>::max ());

extern OCTINTERP_API octave_value
set_internal_variable (double& var, const octave_value_list& args,
                       int nargout, const char *nm,
                       double minval = -octave::numeric_limits<double>::Inf (),
                       double maxval = octave::numeric_limits<double>::Inf ());

extern OCTINTERP_API octave_value
set_internal_variable (std::string& var, const octave_value_list& args,
                       int nargout, const char *nm, bool empty_ok = true);

extern OCTINTERP_API octave_value
set_internal_variable (std::string& var, const octave_value_list& args,
                       int nargout, const char *nm, const char **choices);

extern OCTINTERP_API octave_value
set_internal_variable (int& var, const octave_value_list& args,
                       int nargout, const char *nm, const char **choices);

#define SET_INTERNAL_VARIABLE(NM)                       \
  set_internal_variable (V ## NM, args, nargout, #NM)

#define SET_NONEMPTY_INTERNAL_STRING_VARIABLE(NM)               \
  set_internal_variable (V ## NM, args, nargout, #NM, false)

#define SET_INTERNAL_VARIABLE_WITH_LIMITS(NM, MINVAL, MAXVAL)           \
  set_internal_variable (V ## NM, args, nargout, #NM, MINVAL, MAXVAL)

// in the following, CHOICES must be a C string array terminated by null.
#define SET_INTERNAL_VARIABLE_CHOICES(NM, CHOICES)              \
  set_internal_variable (V ## NM, args, nargout, #NM, CHOICES)

extern OCTINTERP_API std::string builtin_string_variable (const std::string&);
extern OCTINTERP_API int builtin_real_scalar_variable (const std::string&,
                                                       double&);
extern OCTINTERP_API octave_value builtin_any_variable (const std::string&);

extern OCTINTERP_API void bind_ans (const octave_value& val, bool print);

OCTAVE_DEPRECATED ("note: internal variables have been replaced by functions; use 'feval' instead")
OCTINTERP_API extern void
bind_internal_variable (const std::string& fname, const octave_value& val);

extern OCTINTERP_API void mlock (void);
extern OCTINTERP_API void munlock (const std::string&);
extern OCTINTERP_API bool mislocked (const std::string&);

extern OCTINTERP_API void clear_function (const std::string& nm);
extern OCTINTERP_API void clear_variable (const std::string& nm);
extern OCTINTERP_API void clear_symbol (const std::string& nm);

extern OCTINTERP_API void maybe_missing_function_hook (const std::string& name);

#endif
