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/*
* Copyright (C) 2024 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 "RenderStyle.h"
#include <wtf/HashFunctions.h>
#include <wtf/HashMap.h>
#include <wtf/Hasher.h>
namespace WebCore {
namespace Layout {
enum class WhiteSpaceCollapseBehavior : uint8_t {
CollapseAll,
CollapseWhitespaceSequence,
Preserve
};
static WhiteSpaceCollapseBehavior BehaviorForWhiteSpaceCollapse(WhiteSpaceCollapse collapse)
{
switch (collapse) {
case WhiteSpaceCollapse::Collapse:
return WhiteSpaceCollapseBehavior::CollapseAll;
case WhiteSpaceCollapse::PreserveBreaks:
return WhiteSpaceCollapseBehavior::CollapseWhitespaceSequence;
case WhiteSpaceCollapse::Preserve:
case WhiteSpaceCollapse::BreakSpaces:
// TODO: WhiteSpaceCollapse::PreserveSpaces should also be handled this way.
// WhiteSpaceCollapse::Preserve and WhiteSpaceCollapse::BreakSpaces
// have the same text breaking positions so we don't need to recalculate
// breaking points when switching between these behaviors.
return WhiteSpaceCollapseBehavior::Preserve;
}
ASSERT_NOT_REACHED();
return WhiteSpaceCollapseBehavior::CollapseAll;
}
struct TextBreakingPositionContext {
WhiteSpaceCollapseBehavior whitespaceCollapseBehavior { WhiteSpaceCollapseBehavior::CollapseAll };
OverflowWrap overflowWrap { OverflowWrap::Normal };
LineBreak lineBreak { LineBreak::Normal };
WordBreak wordBreak { WordBreak::Normal };
NBSPMode nbspMode { NBSPMode::Normal };
AtomString locale;
bool isHashTableDeletedValue { false };
TextBreakingPositionContext(const RenderStyle&);
TextBreakingPositionContext() = default;
friend bool operator==(const TextBreakingPositionContext&, const TextBreakingPositionContext&) = default;
};
inline TextBreakingPositionContext::TextBreakingPositionContext(const RenderStyle& style)
: whitespaceCollapseBehavior(BehaviorForWhiteSpaceCollapse(style.whiteSpaceCollapse()))
, overflowWrap(style.overflowWrap())
, lineBreak(style.lineBreak())
, wordBreak(style.wordBreak())
, nbspMode(style.nbspMode())
, locale(style.computedLocale())
{
}
void add(Hasher&, const TextBreakingPositionContext&);
struct TextBreakingPositionContextHash {
static unsigned hash(const TextBreakingPositionContext& context) { return computeHash(context); }
static bool equal(const TextBreakingPositionContext& a, const TextBreakingPositionContext& b) { return a == b; }
static const bool safeToCompareToEmptyOrDeleted = false;
};
} // namespace Layout
} // namespace WebCore
namespace WTF {
template<>
struct HashTraits<WebCore::Layout::TextBreakingPositionContext> : GenericHashTraits<WebCore::Layout::TextBreakingPositionContext> {
static void constructDeletedValue(WebCore::Layout::TextBreakingPositionContext& slot) { slot.isHashTableDeletedValue = true; }
static bool isDeletedValue(const WebCore::Layout::TextBreakingPositionContext& value) { return value.isHashTableDeletedValue; }
static WebCore::Layout::TextBreakingPositionContext emptyValue() { return { }; }
};
template<> struct DefaultHash<WebCore::Layout::TextBreakingPositionContext> : WebCore::Layout::TextBreakingPositionContextHash { };
} // namespace WTF
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