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style_builder.cc
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style_builder.cc
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/*
* Copyright (C) 2013 Google Inc. All rights reserved.
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
* Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
* Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc.
* All rights reserved.
* Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
* Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
* Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
* (http://www.torchmobile.com/)
* Copyright (c) 2011, Code Aurora Forum. All rights reserved.
* Copyright (C) Research In Motion Limited 2011. All rights reserved.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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
* OWNER OR CONTRIBUTORS 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 <memory>
#include <utility>
#include "third_party/blink/renderer/core/animation/css/css_animations.h"
#include "third_party/blink/renderer/core/css/css_property_name.h"
#include "third_party/blink/renderer/core/css/properties/css_property_ref.h"
#include "third_party/blink/renderer/core/css/properties/longhand.h"
#include "third_party/blink/renderer/core/css/properties/longhands/variable.h"
#include "third_party/blink/renderer/core/css/resolver/style_builder.h"
#include "third_party/blink/renderer/core/css/resolver/style_resolver_state.h"
#include "third_party/blink/renderer/core/style/computed_style.h"
namespace blink {
namespace {
#if DCHECK_IS_ON()
bool IsCustomPropertyWithUniversalSyntax(const CSSProperty& property) {
if (const auto* custom_property = DynamicTo<CustomProperty>(property)) {
return custom_property->HasUniversalSyntax();
}
return false;
}
#endif // DCHECK_IS_ON()
} // namespace
void StyleBuilder::ApplyProperty(const CSSPropertyName& name,
StyleResolverState& state,
const CSSValue& value,
ValueMode value_mode) {
CSSPropertyRef ref(name, state.GetDocument());
DCHECK(ref.IsValid());
ApplyProperty(ref.GetProperty(), state, value, value_mode);
}
void StyleBuilder::ApplyProperty(const CSSProperty& property,
StyleResolverState& state,
const CSSValue& value,
ValueMode value_mode) {
const CSSProperty* physical = &property;
if (property.IsSurrogate()) {
physical = property.SurrogateFor(state.StyleBuilder().Direction(),
state.StyleBuilder().GetWritingMode());
DCHECK(physical);
}
ApplyPhysicalProperty(*physical, state, value, value_mode);
}
void StyleBuilder::ApplyPhysicalProperty(const CSSProperty& property,
StyleResolverState& state,
const CSSValue& value,
ValueMode value_mode) {
DCHECK(!Variable::IsStaticInstance(property))
<< "Please use a CustomProperty instance to apply custom properties";
DCHECK(!property.IsSurrogate())
<< "Please use ApplyProperty for surrogate properties";
CSSPropertyID id = property.PropertyID();
// These values must be resolved by StyleCascade before application:
DCHECK(!value.IsPendingSubstitutionValue());
DCHECK(!value.IsRevertValue());
DCHECK(!value.IsRevertLayerValue());
// CSSVariableReferenceValues should have been resolved as well, *except*
// for custom properties with universal syntax, which actually use
// CSSVariableReferenceValue to represent their computed value.
#if DCHECK_IS_ON()
DCHECK(!value.IsVariableReferenceValue() ||
IsCustomPropertyWithUniversalSyntax(property));
#endif // DCHECK_IS_ON()
DCHECK(!property.IsShorthand())
<< "Shorthand property id = " << static_cast<int>(id)
<< " wasn't expanded at parsing time";
bool is_inherit = state.ParentNode() && value.IsInheritedValue();
bool is_initial = value.IsInitialValue() ||
(!state.ParentNode() && value.IsInheritedValue());
// isInherit => !isInitial && isInitial => !isInherit
DCHECK(!is_inherit || !is_initial);
// isInherit => (state.parentNode() && state.parentStyle())
DCHECK(!is_inherit || (state.ParentNode() && state.ParentStyle()));
bool is_inherited_for_unset = state.IsInheritedForUnset(property);
if (is_inherit && !is_inherited_for_unset) {
state.StyleBuilder().SetHasExplicitInheritance();
state.ParentStyle()->SetChildHasExplicitInheritance();
} else if (value.IsUnsetValue()) {
DCHECK(!is_inherit && !is_initial);
if (is_inherited_for_unset) {
is_inherit = true;
} else {
is_initial = true;
}
}
if (is_initial) {
To<Longhand>(property).ApplyInitial(state);
} else if (is_inherit) {
To<Longhand>(property).ApplyInherit(state);
} else {
To<Longhand>(property).ApplyValue(state, value, value_mode);
}
}
} // namespace blink