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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/core/css/properties/longhands/will_change.h"
#include "third_party/blink/renderer/core/css/css_value_list.h"
#include "third_party/blink/renderer/core/css/parser/css_parser_token_range.h"
#include "third_party/blink/renderer/core/css/parser/css_property_parser.h"
#include "third_party/blink/renderer/core/css/parser/css_property_parser_helpers.h"
#include "third_party/blink/renderer/core/css/properties/computed_style_utils.h"
#include "third_party/blink/renderer/core/style/computed_style.h"
namespace blink {
namespace CSSLonghand {
const CSSValue* WillChange::ParseSingleValue(
CSSParserTokenRange& range,
const CSSParserContext& context,
const CSSParserLocalContext&) const {
if (range.Peek().Id() == CSSValueAuto)
return CSSPropertyParserHelpers::ConsumeIdent(range);
CSSValueList* values = CSSValueList::CreateCommaSeparated();
// Every comma-separated list of identifiers is a valid will-change value,
// unless the list includes an explicitly disallowed identifier.
while (true) {
if (range.Peek().GetType() != kIdentToken)
return nullptr;
CSSPropertyID unresolved_property =
UnresolvedCSSPropertyID(range.Peek().Value());
if (unresolved_property != CSSPropertyInvalid &&
unresolved_property != CSSPropertyVariable) {
#if DCHECK_IS_ON()
DCHECK(CSSProperty::Get(resolveCSSPropertyID(unresolved_property))
.IsEnabled());
#endif
// Now "all" is used by both CSSValue and CSSPropertyValue.
// Need to return nullptr when currentValue is CSSPropertyAll.
if (unresolved_property == CSSPropertyWillChange ||
unresolved_property == CSSPropertyAll)
return nullptr;
values->Append(*CSSCustomIdentValue::Create(unresolved_property));
range.ConsumeIncludingWhitespace();
} else {
switch (range.Peek().Id()) {
case CSSValueNone:
case CSSValueAll:
case CSSValueAuto:
case CSSValueDefault:
case CSSValueInitial:
case CSSValueInherit:
return nullptr;
case CSSValueContents:
case CSSValueScrollPosition:
values->Append(*CSSPropertyParserHelpers::ConsumeIdent(range));
break;
default:
range.ConsumeIncludingWhitespace();
break;
}
}
if (range.AtEnd())
break;
if (!CSSPropertyParserHelpers::ConsumeCommaIncludingWhitespace(range))
return nullptr;
}
return values;
}
const CSSValue* WillChange::CSSValueFromComputedStyleInternal(
const ComputedStyle& style,
const SVGComputedStyle&,
const LayoutObject*,
Node* styled_node,
bool allow_visited_style) const {
return ComputedStyleUtils::ValueForWillChange(
style.WillChangeProperties(), style.WillChangeContents(),
style.WillChangeScrollPosition());
}
void WillChange::ApplyInitial(StyleResolverState& state) const {
state.Style()->SetWillChangeContents(false);
state.Style()->SetWillChangeScrollPosition(false);
state.Style()->SetWillChangeProperties(Vector<CSSPropertyID>());
state.Style()->SetSubtreeWillChangeContents(
state.ParentStyle()->SubtreeWillChangeContents());
}
void WillChange::ApplyInherit(StyleResolverState& state) const {
state.Style()->SetWillChangeContents(
state.ParentStyle()->WillChangeContents());
state.Style()->SetWillChangeScrollPosition(
state.ParentStyle()->WillChangeScrollPosition());
state.Style()->SetWillChangeProperties(
state.ParentStyle()->WillChangeProperties());
state.Style()->SetSubtreeWillChangeContents(
state.ParentStyle()->SubtreeWillChangeContents());
}
void WillChange::ApplyValue(StyleResolverState& state,
const CSSValue& value) const {
bool will_change_contents = false;
bool will_change_scroll_position = false;
Vector<CSSPropertyID> will_change_properties;
if (value.IsIdentifierValue()) {
DCHECK_EQ(ToCSSIdentifierValue(value).GetValueID(), CSSValueAuto);
} else {
DCHECK(value.IsValueList());
for (auto& will_change_value : ToCSSValueList(value)) {
if (will_change_value->IsCustomIdentValue()) {
will_change_properties.push_back(
ToCSSCustomIdentValue(*will_change_value).ValueAsPropertyID());
} else if (ToCSSIdentifierValue(*will_change_value).GetValueID() ==
CSSValueContents) {
will_change_contents = true;
} else if (ToCSSIdentifierValue(*will_change_value).GetValueID() ==
CSSValueScrollPosition) {
will_change_scroll_position = true;
} else {
NOTREACHED();
}
}
}
state.Style()->SetWillChangeContents(will_change_contents);
state.Style()->SetWillChangeScrollPosition(will_change_scroll_position);
state.Style()->SetWillChangeProperties(will_change_properties);
state.Style()->SetSubtreeWillChangeContents(
will_change_contents || state.ParentStyle()->SubtreeWillChangeContents());
}
} // namespace CSSLonghand
} // namespace blink
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