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
|
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/dom/CSSUnitValue.h"
#include "mozilla/AlreadyAddRefed.h"
#include "mozilla/CSSPropertyId.h"
#include "mozilla/ErrorResult.h"
#include "mozilla/RefPtr.h"
#include "mozilla/dom/BindingDeclarations.h"
#include "mozilla/dom/CSSUnitValueBinding.h"
namespace mozilla::dom {
CSSUnitValue::CSSUnitValue(nsCOMPtr<nsISupports> aParent, double aValue,
const nsACString& aUnit)
: CSSNumericValue(std::move(aParent), ValueType::UnitValue),
mValue(aValue),
mUnit(aUnit) {}
JSObject* CSSUnitValue::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return CSSUnitValue_Binding::Wrap(aCx, this, aGivenProto);
}
// start of CSSUnitValue Web IDL implementation
// https://drafts.css-houdini.org/css-typed-om-1/#dom-cssunitvalue-cssunitvalue
//
// static
already_AddRefed<CSSUnitValue> CSSUnitValue::Constructor(
const GlobalObject& aGlobal, double aValue, const nsACString& aUnit,
ErrorResult& aRv) {
// XXX Units should be normalized to lowercase. The Typed OM spec doesn’t
// state this explicitly, but WPT requires lowercase normalization and it
// can also be deduced from the CSS Values spec. Besides fixing it here,
// a spec issue may be needed to clarify this.
// Step 1.
// XXX A type should be created from unit and if that fails, the failure
// should be propagated here
// Step 2.
return MakeAndAddRef<CSSUnitValue>(aGlobal.GetAsSupports(), aValue, aUnit);
}
double CSSUnitValue::Value() const { return mValue; }
void CSSUnitValue::SetValue(double aArg) { mValue = aArg; }
void CSSUnitValue::GetUnit(nsCString& aRetVal) const { aRetVal = mUnit; }
// end of CSSUnitValue Web IDL implementation
void CSSUnitValue::ToCssTextWithProperty(const CSSPropertyId& aPropertyId,
nsACString& aDest) const {
// XXX See:
// https://drafts.css-houdini.org/css-typed-om-1/#create-an-internal-representation
//
// The current |isValueOutOfRange| check implements only a minimal subset of
// the algorithm step that wraps out-of-range numeric values (e.g. negative
// perspective) in a calc() expression to keep them representable.
//
// This is a temporary solution until a more robust mechanism is added for
// handling range checks and value wrapping. The long-term plan is to move
// this logic to a dedicated FromTyped trait or similar infrastructure that
// can validate and construct internal representations in a property-aware
// and fully spec-compliant manner. See bug 2005142
const bool isValueOutOfRange = [](NonCustomCSSPropertyId aId, double aValue) {
switch (aId) {
case eCSSProperty_column_width:
case eCSSProperty_perspective:
case eCSSProperty_border_block_end_width:
case eCSSProperty_border_block_start_width:
case eCSSProperty_border_bottom_width:
case eCSSProperty_border_inline_end_width:
case eCSSProperty_border_inline_start_width:
case eCSSProperty_border_left_width:
case eCSSProperty_border_right_width:
case eCSSProperty_border_top_width:
case eCSSProperty_outline_width:
return aValue < 0;
default:
return false;
}
}(aPropertyId.mId, mValue);
if (isValueOutOfRange) {
aDest.Append("calc("_ns);
}
aDest.AppendFloat(mValue);
aDest.Append(mUnit);
if (isValueOutOfRange) {
aDest.Append(")"_ns);
}
}
CSSUnitValue& CSSStyleValue::GetAsCSSUnitValue() {
MOZ_DIAGNOSTIC_ASSERT(mValueType == ValueType::UnitValue);
return *static_cast<CSSUnitValue*>(this);
}
} // namespace mozilla::dom
|
