Source/WebCore/layout/LayoutPhase.cpp

/*
 * Copyright (C) 2019 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
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 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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#include "config.h"
#include "LayoutPhase.h"

#if ENABLE(LAYOUT_FORMATTING_CONTEXT)

#include <wtf/NeverDestroyed.h>

namespace WebCore {
namespace Layout {

static Phase& phase()
{
    static NeverDestroyed<Phase> phase;
    return phase;
}

bool Phase::isInTreeBuilding()
{ 
    return *phase() && (*phase()).value() == Type::TreeBuilding;
}

bool Phase::isInLayout()
{ 
    return *phase() && (*phase()).value() == Type::Layout;
}

bool Phase::isInInvalidation()
{ 
    return *phase() && (*phase()).value() == Type::Invalidation;
}

PhaseScope::PhaseScope(Phase::Type type)
{ 
    // Should never nest states like calling TreeBuilding from Layout. 
    ASSERT(!(*phase()).has_value());
    phase().set(type);
}
    
PhaseScope::~PhaseScope()
{
    phase().reset();
}

}
}
#endif