forked from WebKit/WebKit
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathCSSUnitValue.cpp
More file actions
188 lines (166 loc) · 6.08 KB
/
CSSUnitValue.cpp
File metadata and controls
188 lines (166 loc) · 6.08 KB
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
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
/*
* Copyright (C) 2019 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 THE COPYRIGHT HOLDER “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 HOLDER 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.
*/
#include "config.h"
#include "CSSUnitValue.h"
#if ENABLE(CSS_TYPED_OM)
#include "CSSParserToken.h"
#include "CSSPrimitiveValue.h"
#include <wtf/IsoMallocInlines.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(CSSUnitValue);
CSSUnitType CSSUnitValue::parseUnit(const String& unit)
{
if (unit == "number"_s)
return CSSUnitType::CSS_NUMBER;
if (unit == "percent"_s)
return CSSUnitType::CSS_PERCENTAGE;
// FIXME: Remove these when LineHeightUnitsEnabled is changed back to true or removed
// https://bugs.webkit.org/show_bug.cgi?id=211351
if (unit == "lh"_s)
return CSSUnitType::CSS_LHS;
if (unit == "rlh"_s)
return CSSUnitType::CSS_RLHS;
return CSSParserToken::stringToUnitType(unit);
}
ASCIILiteral CSSUnitValue::unit() const
{
switch (m_unit) {
case CSSUnitType::CSS_NUMBER:
return "number"_s;
case CSSUnitType::CSS_PERCENTAGE:
return "percent"_s;
default:
break;
}
return unitSerialization();
}
ASCIILiteral CSSUnitValue::unitSerialization() const
{
return CSSPrimitiveValue::unitTypeString(m_unit);
}
void CSSUnitValue::serialize(StringBuilder& builder, OptionSet<SerializationArguments>) const
{
builder.append(FormattedCSSNumber::create(m_value));
builder.append(unitSerialization());
}
ExceptionOr<Ref<CSSUnitValue>> CSSUnitValue::create(double value, const String& unit)
{
auto parsedUnit = parseUnit(unit);
if (parsedUnit == CSSUnitType::CSS_UNKNOWN)
return Exception { TypeError };
auto type = CSSNumericType::create(parsedUnit);
if (!type)
return Exception { TypeError };
auto unitValue = adoptRef(*new CSSUnitValue(value, parsedUnit));
unitValue->m_type = WTFMove(*type);
return unitValue;
}
CSSUnitValue::CSSUnitValue(double value, CSSUnitType unit)
: CSSNumericValue(CSSNumericType::create(unit).value_or(CSSNumericType()))
, m_value(value)
, m_unit(unit)
{
}
static double conversionToCanonicalUnitsScaleFactor(CSSUnitType unit)
{
constexpr double pixelsPerInch = 96;
constexpr double pixelsPerCentimeter = pixelsPerInch / 2.54;
constexpr double pointsPerInch = 72;
constexpr double picasPerInch = 6;
switch (unit) {
case CSSUnitType::CSS_MS:
return 0.001;
case CSSUnitType::CSS_CM:
return pixelsPerCentimeter;
case CSSUnitType::CSS_DPCM:
return 1.0 / pixelsPerCentimeter;
case CSSUnitType::CSS_MM:
return pixelsPerCentimeter / 10;
case CSSUnitType::CSS_Q:
return pixelsPerCentimeter / 40;
case CSSUnitType::CSS_IN:
return pixelsPerInch;
case CSSUnitType::CSS_DPI:
return 1.0 / pixelsPerInch;
case CSSUnitType::CSS_PT:
return pixelsPerInch / pointsPerInch;
case CSSUnitType::CSS_PC:
return pixelsPerInch / picasPerInch;
case CSSUnitType::CSS_RAD:
return 180 / piDouble;
case CSSUnitType::CSS_GRAD:
return 0.9;
case CSSUnitType::CSS_TURN:
return 360;
case CSSUnitType::CSS_KHZ:
return 1000;
default:
return 1.0;
}
}
RefPtr<CSSUnitValue> CSSUnitValue::convertTo(CSSUnitType unit) const
{
// https://drafts.css-houdini.org/css-typed-om/#convert-a-cssunitvalue
if (unitCategory(unitEnum()) != unitCategory(unit))
return nullptr;
return create(m_value * conversionToCanonicalUnitsScaleFactor(unitEnum()) / conversionToCanonicalUnitsScaleFactor(unit), unit);
}
auto CSSUnitValue::toSumValue() const -> std::optional<SumValue>
{
// https://drafts.css-houdini.org/css-typed-om/#create-a-sum-value
auto canonicalUnit = [] (CSSUnitType unit) {
// FIXME: We probably want to change the definition of canonicalUnitTypeForCategory so this lambda isn't necessary.
auto category = unitCategory(unit);
switch (category) {
case CSSUnitCategory::Percent:
return CSSUnitType::CSS_PERCENTAGE;
case CSSUnitCategory::Other:
if (unit == CSSUnitType::CSS_FR)
return CSSUnitType::CSS_FR;
break;
default:
break;
}
return canonicalUnitTypeForCategory(category);
} (m_unit);
auto convertedValue = m_value * conversionToCanonicalUnitsScaleFactor(unitEnum()) / conversionToCanonicalUnitsScaleFactor(canonicalUnit);
if (m_unit == CSSUnitType::CSS_NUMBER)
return { { { convertedValue, { } } } };
return { { { convertedValue, { { canonicalUnit, 1 } } } } };
}
bool CSSUnitValue::equals(const CSSNumericValue& other) const
{
// https://drafts.css-houdini.org/css-typed-om/#equal-numeric-value
auto* otherUnitValue = dynamicDowncast<CSSUnitValue>(other);
if (!otherUnitValue)
return false;
return m_value == otherUnitValue->m_value && m_unit == otherUnitValue->m_unit;
}
} // namespace WebCore
#endif