/*
 * Copyright (C) 2022 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once

#include "Expression.h"
#include "Statement.h"
#include <wtf/UniqueRef.h>

namespace WGSL::AST {

class AssignmentStatement final : public Statement {
    WTF_MAKE_FAST_ALLOCATED;
public:
    AssignmentStatement(SourceSpan span, std::unique_ptr<Expression>&& lhs, UniqueRef<Expression>&& rhs)
        : Statement(span)
        , m_lhs(WTFMove(lhs))
        , m_rhs(WTFMove(rhs))
    {
    }

    Kind kind() const override { return Kind::Assignment; }
    Expression* maybeLhs() { return m_lhs.get(); }
    Expression& rhs() { return m_rhs; }

private:
    // LHS can be null in the case it is '_', but RHS is never null
    std::unique_ptr<Expression> m_lhs;
    UniqueRef<Expression> m_rhs;
};

} // namespace WGSL::AST

SPECIALIZE_TYPE_TRAITS_WGSL_STATEMENT(AssignmentStatement, isAssignment())