1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
|
/*
* 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:
* 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. ``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
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* 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/RenderStyleConstants.h>
#include <WebCore/StyleValueTypes.h>
namespace WebCore {
namespace Style {
// <text-edge> = [ text | cap | ex | ideographic | ideographic-ink ]
// [ text | alphabetic | ideographic | ideographic-ink ]?
// https://drafts.csswg.org/css-inline-3/#typedef-text-edge
struct TextEdgePair {
TextEdgeOver over;
TextEdgeUnder under;
template<typename... F> constexpr decltype(auto) switchOn(F&&... f) const
{
auto visitor = WTF::makeVisitor(std::forward<F>(f)...);
switch (over) {
case TextEdgeOver::Text:
case TextEdgeOver::Cap:
case TextEdgeOver::Ex:
if (under == TextEdgeUnder::Text)
return visitor(over);
break;
case TextEdgeOver::Ideographic:
if (under == TextEdgeUnder::Ideographic)
return visitor(over);
break;
case TextEdgeOver::IdeographicInk:
if (under == TextEdgeUnder::IdeographicInk)
return visitor(over);
break;
}
return visitor(SpaceSeparatedTuple { over, under });
}
constexpr bool operator==(const TextEdgePair&) const = default;
};
template<typename K> struct TextEdge {
using Keyword = K;
using Base = TextEdge<Keyword>;
constexpr TextEdge(Keyword keyword) : m_value { keyword } { }
constexpr TextEdge(TextEdgeOver over, TextEdgeUnder under) : m_value { TextEdgePair { over, under } } { }
constexpr bool isKeyword() const { return holdsAlternative<Keyword>(); }
constexpr bool isTextEdgePair() const { return holdsAlternative<TextEdgePair>(); }
constexpr std::optional<TextEdgePair> tryTextEdgePair() const { return isTextEdgePair() ? std::make_optional(std::get<TextEdgePair>(m_value)) : std::nullopt; }
template<typename U> constexpr bool holdsAlternative() const
{
return WTF::holdsAlternative<U>(m_value);
}
template<typename... F> constexpr decltype(auto) switchOn(F&&... f) const
{
return WTF::switchOn(m_value, std::forward<F>(f)...);
}
constexpr bool operator==(const TextEdge<Keyword>&) const = default;
protected:
Variant<Keyword, TextEdgePair> m_value;
};
// MARK: - Concepts
template<typename T> concept TextEdgeDerived = WTF::IsBaseOfTemplate<TextEdge, T>::value && VariantLike<T>;
} // namespace Style
} // namespace WebCore
DEFINE_VARIANT_LIKE_CONFORMANCE(WebCore::Style::TextEdgePair)
|
