/*
 *	aegis - project change supervisor
 *	Copyright (C) 1994, 1996 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 struct member assignment expressions
 */

#include <aer/expr/struct.h>
#include <aer/expr/struct_asign.h>
#include <aer/value/ref.h>
#include <aer/value/void.h>
#include <symtab.h>


typedef struct rpt_expr_struct_assign_ty rpt_expr_struct_assign_ty;
struct rpt_expr_struct_assign_ty
{
	RPT_EXPR
	string_ty	*name;
	rpt_expr_ty	*value;
};


static void destruct _((rpt_expr_ty *));

static void
destruct(ep)
	rpt_expr_ty	*ep;
{
	rpt_expr_struct_assign_ty *this;

	this = (rpt_expr_struct_assign_ty *)ep;
	str_free(this->name);
	rpt_expr_free(this->value);
}


static rpt_value_ty *evaluate _((rpt_expr_ty *));

static rpt_value_ty *
evaluate(ep)
	rpt_expr_ty	*ep;
{
	rpt_expr_struct_assign_ty *this;
	rpt_value_ty	*vp;
	rpt_value_ty	*rvp;
	symtab_ty	*stp;

	this = (rpt_expr_struct_assign_ty *)ep;
	vp = rpt_expr_evaluate(this->value, 0);
	if (vp->method->type == rpt_value_type_error)
		return vp;
	rvp = rpt_value_reference(vp);
	rpt_value_free(vp);
	stp = rpt_expr_struct__symtab_query();
	symtab_assign(stp, this->name, rvp);
	return rpt_value_void();
}


static rpt_expr_method_ty method =
{
	sizeof(rpt_expr_struct_assign_ty),
	"struct assign",
	0, /* construct */
	destruct,
	evaluate,
	0, /* lvalue */
};


rpt_expr_ty *
rpt_expr_struct_assign(name, ep)
	string_ty	*name;
	rpt_expr_ty	*ep;
{
	rpt_expr_struct_assign_ty *this;

	this = (rpt_expr_struct_assign_ty *)rpt_expr_alloc(&method);
	this->name = str_copy(name);
	this->value = rpt_expr_copy(ep);
	return (rpt_expr_ty *)this;
}