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/*
* Copyright (C) 2012 Google Inc. All rights reserved.
* Copyright (C) 2013-2017 Igalia S.L.
* Copyright (C) 2025 Samuel Weinig <sam@webkit.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER OR 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 <WebCore/StyleGridPositionSide.h>
#include <WebCore/StylePrimitiveNumeric.h>
#include <WebCore/StyleValueTypes.h>
namespace WebCore {
namespace Style {
// <grid-line-explicit> = [ [ <integer [-∞,-1]> | <integer [1,∞]> ] && <custom-ident>? ]
struct GridPositionExplicit {
// NOTE: We don't currently have an efficient way to represent disjoint numeric ranges so an unconstrained range is used here instead.
using Position = Integer<>;
Position position { 1 };
CustomIdentifier name { nullAtom() };
template<typename... F> decltype(auto) switchOn(F&&... f) const
{
auto visitor = WTF::makeVisitor(std::forward<F>(f)...);
if (name.value.isNull())
return visitor(position);
return visitor(SpaceSeparatedTuple { position, name });
}
bool operator==(const GridPositionExplicit&) const = default;
};
// <grid-line-span> = [ span && [ <integer [1,∞]> || <custom-ident> ] ]
struct GridPositionSpan {
using Position = Integer<CSS::Range{1,CSS::Range::infinity}>;
Position position { 1 };
CustomIdentifier name { nullAtom() };
template<typename... F> decltype(auto) switchOn(F&&... f) const
{
auto visitor = WTF::makeVisitor(std::forward<F>(f)...);
if (name.value.isNull())
return visitor(SpaceSeparatedTuple { CSS::Keyword::Span { }, position });
if (position == 1)
return visitor(SpaceSeparatedTuple { CSS::Keyword::Span { }, name });
return visitor(SpaceSeparatedTuple { CSS::Keyword::Span { }, position, name });
}
bool operator==(const GridPositionSpan&) const = default;
};
// <grid-line> = auto | <custom-ident> | <grid-line-explicit> | <grid-line-span>
// https://drafts.csswg.org/css-grid/#typedef-grid-row-start-grid-line
// FIXME: The standard calls this type "grid-line". We should consider matching it.
struct GridPosition {
using Explicit = GridPositionExplicit;
using Span = GridPositionSpan;
GridPosition(CSS::Keyword::Auto) { }
WEBCORE_EXPORT GridPosition(Explicit&&);
WEBCORE_EXPORT GridPosition(Span&&);
GridPosition(CustomIdentifier&&);
bool isAuto() const { return m_type == GridPositionType::Auto; }
bool isExplicit() const { return m_type == GridPositionType::Explicit; }
bool isSpan() const { return m_type == GridPositionType::Span; }
bool isNamedGridArea() const { return m_type == GridPositionType::NamedGridArea; }
WEBCORE_EXPORT int explicitPosition() const;
WEBCORE_EXPORT int spanPosition() const;
String namedGridLine() const;
bool shouldBeResolvedAgainstOppositePosition() const { return isAuto() || isSpan(); }
// Note that grid line 1 is internally represented by the index 0, that's why the max value for
// a position is gridMaxTracks instead of gridMaxTracks + 1.
static int max();
static int min();
template<typename... F> decltype(auto) switchOn(F&&... f) const
{
auto visitor = WTF::makeVisitor(std::forward<F>(f)...);
switch (m_type) {
case GridPositionType::Auto:
return visitor(CSS::Keyword::Auto { });
case GridPositionType::Explicit:
return visitor(Explicit { { m_integerPosition }, m_namedGridLine });
case GridPositionType::Span:
return visitor(Span { { m_integerPosition }, m_namedGridLine });
case GridPositionType::NamedGridArea:
return visitor(m_namedGridLine);
}
RELEASE_ASSERT_NOT_REACHED();
}
bool operator==(const GridPosition&) const = default;
WEBCORE_EXPORT static void setMaxPositionForTesting(unsigned);
private:
friend void add(Hasher&, const GridPosition&);
enum class GridPositionType : uint8_t {
Auto,
Explicit,
Span,
NamedGridArea
};
GridPositionType m_type { GridPositionType::Auto };
int m_integerPosition { 1 };
CustomIdentifier m_namedGridLine;
};
// MARK: - Conversion
template<> struct CSSValueConversion<GridPosition> { auto operator()(BuilderState&, const CSSValue&) -> GridPosition; };
// MARK: - Logging
WTF::TextStream& operator<<(WTF::TextStream&, const GridPosition&);
} // namespace Style
} // namespace WebCore
DEFINE_VARIANT_LIKE_CONFORMANCE(WebCore::Style::GridPosition)
DEFINE_VARIANT_LIKE_CONFORMANCE(WebCore::Style::GridPosition::Explicit)
DEFINE_VARIANT_LIKE_CONFORMANCE(WebCore::Style::GridPosition::Span)
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