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////////////////////////////////////////////////////////////////////////
//
// 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 "error.h"
#include "interpreter-private.h"
#include "oct-lvalue.h"
#include "parse.h"
#include "pt-const.h"
#include "pt-id.h"
#include "symscope.h"
#include "utils.h"
#include "variables.h"
namespace octave
{
// Symbols from the symbol table.
void
tree_identifier::eval_undefined_error (void)
{
int l = line ();
int c = column ();
std::string msg = "'" + name () + "' undefined";
if (l > 0)
{
msg += " near line " + std::to_string (l);
if (c > 0)
msg += ", column " + std::to_string (l);
}
std::string missing_msg = maybe_missing_function_hook (name ());
if (! missing_msg.empty ())
msg += "\n\n" + missing_msg;
error_with_id ("Octave:undefined-function", "%s", msg.c_str ());
}
octave_lvalue
tree_identifier::lvalue (tree_evaluator& tw)
{
if (m_sym.is_added_static ())
static_workspace_error ();
return octave_lvalue (m_sym, tw.get_current_stack_frame ());
}
tree_identifier *
tree_identifier::dup (symbol_scope& scope) const
{
// The new tree_identifier object contains a symbol_record
// entry from the duplicated scope.
symbol_record new_sym = scope.find_symbol (name ());
tree_identifier *new_id
= new tree_identifier (new_sym, line (), column ());
new_id->copy_base (*this);
return new_id;
}
octave_value_list
tree_identifier::evaluate_n (tree_evaluator& tw, int nargout)
{
octave_value_list retval;
octave_value val = tw.varval (m_sym);
if (val.is_undefined ())
{
interpreter& interp = tw.get_interpreter ();
symbol_table& symtab = interp.get_symbol_table ();
val = symtab.find_function (m_sym.name ());
}
if (val.is_defined ())
{
// GAGME -- this would be cleaner if we required
// parens to indicate function calls.
//
// If this identifier refers to a function, we need to know
// whether it is indexed so that we can do the same thing
// for 'f' and 'f()'. If the index is present and the function
// object declares it can handle it, return the function object
// and let tree_index_expression::rvalue handle indexing.
// Otherwise, arrange to call the function here, so that we don't
// return the function definition as a value.
octave_function *fcn = nullptr;
if (val.is_function ())
fcn = val.function_value (true);
if (fcn && ! (is_postfix_indexed ()
&& fcn->accepts_postfix_index (postfix_index ())))
{
retval = fcn->call (tw, nargout);
}
else
{
if (print_result () && nargout == 0
&& tw.statement_printing_enabled ())
{
octave_value_list args = ovl (val);
args.stash_name_tags (string_vector (name ()));
feval ("display", args);
}
retval = ovl (val);
}
}
else if (m_sym.is_added_static ())
static_workspace_error ();
else
eval_undefined_error ();
return retval;
}
octave_lvalue
tree_black_hole::lvalue (tree_evaluator& tw)
{
octave_lvalue retval (m_sym, tw.get_current_stack_frame ());
retval.mark_black_hole ();
return retval;
}
}
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