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
|
/*
* 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.
*/
#include "config.h"
#include "StyleTextAlign.h"
#include "Document.h"
#include "Element.h"
#include "RenderStyle.h"
#include "StyleBuilderChecking.h"
#include "StylePrimitiveKeyword+CSSValueConversion.h"
namespace WebCore {
namespace Style {
auto CSSValueConversion<TextAlign>::operator()(BuilderState& state, const CSSValue& value) -> TextAlign
{
RefPtr primitiveValue = requiredDowncast<CSSPrimitiveValue>(state, value);
if (!primitiveValue)
return TextAlign::Start;
if (!primitiveValue->isValueID()) {
state.setCurrentPropertyInvalidAtComputedValueTime();
return TextAlign::Start;
}
auto& parentStyle = state.parentStyle();
// User agents are expected to have a rule in their user agent stylesheet that matches 'th' elements that have a parent
// node whose computed value for the 'text-align' property is its initial value, whose declaration block consists of
// just a single declaration that sets the 'text-align' property to the value 'center'.
// https://html.spec.whatwg.org/multipage/rendering.html#rendering
if (primitiveValue->valueID() == CSSValueInternalThCenter) {
if (parentStyle.textAlign() == TextAlign::Start)
return TextAlign::Center;
return parentStyle.textAlign();
}
if (primitiveValue->valueID() == CSSValueWebkitMatchParent || primitiveValue->valueID() == CSSValueMatchParent) {
RefPtr element = state.element();
if (element && element == state.document().documentElement())
return TextAlign::Start;
if (parentStyle.textAlign() == TextAlign::Start)
return parentStyle.writingMode().isBidiLTR() ? TextAlign::Left : TextAlign::Right;
if (parentStyle.textAlign() == TextAlign::End)
return parentStyle.writingMode().isBidiLTR() ? TextAlign::Right : TextAlign::Left;
return parentStyle.textAlign();
}
return fromCSSValue<TextAlign>(value);
}
} // namespace Style
} // namespace WebCore
|
