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/*
* Copyright (C) 2021 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
namespace WebCore {
namespace Style {
// This is used to identify style scopes that can affect an element.
// Scopes are in tree-of-trees order. Styles from earlier scopes win over later ones (modulo !important).
enum class ScopeOrdinal : int8_t {
ContainingHostLimit = std::numeric_limits<int8_t>::min(),
ContainingHost = -1, // ::part rules and author-exposed UA pseudo classes from the host tree scope. Values less than ContainingHost indicate enclosing scopes.
Element = 0, // Normal rules in the same tree where the element is.
FirstSlot = 1, // ::slotted rules in the parent's shadow tree. Values greater than FirstSlot indicate subsequent slots in the chain.
SlotLimit = std::numeric_limits<int8_t>::max() - 1,
Shadow = std::numeric_limits<int8_t>::max(), // :host rules in element's own shadow tree.
};
inline ScopeOrdinal& operator++(ScopeOrdinal& ordinal)
{
ASSERT(ordinal < ScopeOrdinal::SlotLimit);
return ordinal = static_cast<ScopeOrdinal>(static_cast<int8_t>(ordinal) + 1);
}
inline ScopeOrdinal& operator--(ScopeOrdinal& ordinal)
{
ASSERT(ordinal > ScopeOrdinal::ContainingHostLimit);
return ordinal = static_cast<ScopeOrdinal>(static_cast<int8_t>(ordinal) - 1);
}
}
}
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