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/*
* cook - file construction tool
* Copyright (C) 1997, 1999, 2006, 2007 Peter Miller;
* All rights reserved.
*
* 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 of the License, 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
*
* MANIFEST: functions to manipulate nothing IDs
*/
#include <cook/id/nothing.h>
#include <cook/id/private.h>
#include <cook/opcode/context.h>
/*
* NAME
* destructor
*
* SYNOPSIS
* void destructor(id_ty *);
*
* DESCRIPTION
* The destructor function is used to release the resources held by
* an ID instance.
*/
static void
destructor(id_ty *idp)
{
(void)idp;
}
/*
* NAME
* evaluate
*
* SYNOPSIS
* int evaluate(id_ty *, const string_list_ty *, string_list_ty *);
*
* DESCRIPTION
* The evaluate function is used to evaluate an ID instance (there
* are several types). The arguments to the evaluation are not to
* be changed, the results are only to be appended (not
* constructor'ed first).
*
* RETURNS
* int; 0 on success, -1 on error.
*/
static int
interpret(id_ty *idp, opcode_context_ty *ocp, const struct expr_position_ty *pp)
{
string_list_ty *arg;
(void)idp;
(void)pp;
arg = opcode_context_string_list_pop(ocp);
string_list_delete(arg);
return 0;
}
/*
* NAME
* method
*
* DESCRIPTION
* The method nothing describes this ID class.
*
* CAVEAT
* This symbol is not to be exported from this file (its name is
* not unique).
*/
static id_method_ty method =
{
"nothing",
sizeof(id_ty),
destructor,
interpret,
interpret, /* script */
};
/*
* NAME
* id_nothing_new
*
* SYNOPSIS
* void id_nothing_new(void);
*
* DESCRIPTION
* The id_nothing_new function is used to create a new instance of
* a nothing ID's value. The given value is copied.
*
* RETURNS
* id_ty *; a pointer to a ID instance is dynamic memory.
*
* CAVEAT
* Use id_instance_delete when you are done with it.
*/
id_ty *
id_nothing_new(void)
{
return id_instance_new(&method);
}
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