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// Copyright 2018 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.
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_CSS_PROPERTIES_CSS_PROPERTY_REF_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_CSS_PROPERTIES_CSS_PROPERTY_REF_H_
#include "third_party/blink/renderer/core/css/properties/longhands/custom_property.h"
namespace blink {
class CSSPropertyName;
class Document;
// Use this class to acquire a reference to a CSSProperty instance. The
// reference returned by GetProperty() may point to the embedded CustomProperty
// object, hence this reference is only valid for the lifetime of the
// CSSPropertyRef object.
//
// Usage:
//
// CSSPropertyRef ref(some_string, document);
//
// if (ref.IsValid()) {
// LOG(INFO) << ref.GetProperty().GetName();
// }
//
// Note that any CSSPropertyRef constructor may produce an invalid
// CSSPropertyRef (e.g. if a non-existent property name is provided), so be
// sure to always check IsValid() before calling GetProperty().
class CORE_EXPORT CSSPropertyRef {
DISALLOW_NEW();
public:
// Look up (or create) a CSSProperty.
//
// If the incoming 'name' is not a CSS property, the CSSPropertyRef is
// invalid.
CSSPropertyRef(const String& name, const Document&);
// Like above, but will never produce an invalid CSSPropertyRef.
CSSPropertyRef(const CSSPropertyName&, const Document&);
// If you already have a CSSProperty& object, you may use it to get
// a CSSPropertyRef again.
//
// Note that the CSSProperty& returned by GetProperty() may be different
// than the incoming CSSProperty&.
//
// Note also that this CSSPropertyRef is invalid if the incoming CSSProperty&
// is the static Variable instance.
CSSPropertyRef(const CSSProperty&);
bool IsValid() const { return property_id_ != CSSPropertyID::kInvalid; }
const CSSProperty& GetProperty() const {
DCHECK(IsValid());
if (property_id_ == CSSPropertyID::kVariable)
return custom_property_;
return CSSProperty::Get(resolveCSSPropertyID(property_id_));
}
const CSSUnresolvedProperty& GetUnresolvedProperty() const {
if (isPropertyAlias(property_id_))
return *CSSUnresolvedProperty::GetAliasProperty(property_id_);
return GetProperty();
}
void Trace(Visitor* visitor) { visitor->Trace(custom_property_); }
private:
CSSPropertyID property_id_;
CustomProperty custom_property_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_CSS_PROPERTIES_CSS_PROPERTY_REF_H_
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