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
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
/*
* Copyright (C) 2022 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. ``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 "CSSToLengthConversionData.h"
#include "CSSValueKeywords.h"
#include "GenericMediaQueryTypes.h"
#include "LayoutUnit.h"
namespace WebCore {
class RenderElement;
namespace MQ {
EvaluationResult evaluateLengthFeature(const Feature&, LayoutUnit, const CSSToLengthConversionData&);
EvaluationResult evaluateRatioFeature(const Feature&, FloatSize);
EvaluationResult evaluateBooleanFeature(const Feature&, bool);
EvaluationResult evaluateIntegerFeature(const Feature&, int);
EvaluationResult evaluateNumberFeature(const Feature&, double);
EvaluationResult evaluateResolutionFeature(const Feature&, float);
EvaluationResult evaluateIdentifierFeature(const Feature&, CSSValueID);
template<typename ConcreteEvaluator>
class GenericMediaQueryEvaluator {
public:
EvaluationResult evaluateQueryInParens(const QueryInParens&, const FeatureEvaluationContext&) const;
EvaluationResult evaluateCondition(const Condition&, const FeatureEvaluationContext&) const;
EvaluationResult evaluateFeature(const Feature&, const FeatureEvaluationContext&) const;
private:
const ConcreteEvaluator& concreteEvaluator() const { return static_cast<const ConcreteEvaluator&>(*this); }
};
template<typename ConcreteEvaluator>
EvaluationResult GenericMediaQueryEvaluator<ConcreteEvaluator>::evaluateQueryInParens(const QueryInParens& queryInParens, const FeatureEvaluationContext& context) const
{
return WTF::switchOn(queryInParens, [&](const Condition& condition) {
return evaluateCondition(condition, context);
}, [&](const MQ::Feature& feature) {
return concreteEvaluator().evaluateFeature(feature, context);
}, [&](const MQ::GeneralEnclosed&) {
return MQ::EvaluationResult::Unknown;
});
}
template<typename ConcreteEvaluator>
EvaluationResult GenericMediaQueryEvaluator<ConcreteEvaluator>::evaluateCondition(const Condition& condition, const FeatureEvaluationContext& context) const
{
if (condition.queries.isEmpty())
return EvaluationResult::Unknown;
switch (condition.logicalOperator) {
case LogicalOperator::Not:
return !concreteEvaluator().evaluateQueryInParens(condition.queries.first(), context);
// Kleene 3-valued logic.
case LogicalOperator::And: {
auto result = EvaluationResult::True;
for (auto& query : condition.queries) {
auto queryResult = concreteEvaluator().evaluateQueryInParens(query, context);
if (queryResult == EvaluationResult::False)
return EvaluationResult::False;
if (queryResult == EvaluationResult::Unknown)
result = EvaluationResult::Unknown;
}
return result;
}
case LogicalOperator::Or: {
auto result = EvaluationResult::False;
for (auto& query : condition.queries) {
auto queryResult = concreteEvaluator().evaluateQueryInParens(query, context);
if (queryResult == EvaluationResult::True)
return EvaluationResult::True;
if (queryResult == EvaluationResult::Unknown)
result = EvaluationResult::Unknown;
}
return result;
}
}
RELEASE_ASSERT_NOT_REACHED();
}
template<typename ConcreteEvaluator>
EvaluationResult GenericMediaQueryEvaluator<ConcreteEvaluator>::evaluateFeature(const Feature& feature, const FeatureEvaluationContext& context) const
{
if (!feature.schema)
return MQ::EvaluationResult::Unknown;
return feature.schema->evaluate(feature, context);
}
inline EvaluationResult operator&(EvaluationResult left, EvaluationResult right)
{
if (left == EvaluationResult::Unknown || right == EvaluationResult::Unknown)
return EvaluationResult::Unknown;
if (left == EvaluationResult::True && right == EvaluationResult::True)
return EvaluationResult::True;
return EvaluationResult::False;
}
inline EvaluationResult operator!(EvaluationResult result)
{
switch (result) {
case EvaluationResult::True:
return EvaluationResult::False;
case EvaluationResult::False:
return EvaluationResult::True;
case EvaluationResult::Unknown:
return EvaluationResult::Unknown;
}
RELEASE_ASSERT_NOT_REACHED();
}
inline EvaluationResult toEvaluationResult(bool boolean)
{
return boolean ? EvaluationResult::True : EvaluationResult::False;
}
}
}
|
