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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* (C) 2001 Peter Kelly (pmk@post.com)
* (C) 2001 Dirk Mueller (mueller@kde.org)
* Copyright (C) 2003, 2004, 2005, 2006, 2008, 2012 Apple Inc. All rights
* reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_DOM_ATTRIBUTE_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_DOM_ATTRIBUTE_H_
#include "base/containers/span.h"
#include "build/build_config.h"
#include "third_party/blink/renderer/core/dom/qualified_name.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
namespace blink {
class Attribute;
}
namespace base {
template <>
inline constexpr bool kCanSafelyConvertToByteSpan<::blink::Attribute> =
kCanSafelyConvertToByteSpan<::blink::QualifiedName> &&
kCanSafelyConvertToByteSpan<::WTF::AtomicString>;
}
namespace blink {
// This value is set fairly arbitrarily, to get above what we expect to be
// the maximum number of attributes on a normal element. It is used for
// preallocation in Vectors holding Attributes, e.g. to avoid allocations
// in HTMLAtomicToken (which is short-lived, and thus does not need to worry
// much about extra memory usage).
//
// Many places that use this constant don't actually care directly about
// preallocation, but the value tends to propagate out through APIs.
static constexpr int kAttributePrealloc = 10;
// This is the internal representation of an attribute, consisting of a name and
// value. It is distinct from the web-exposed Attr, which also knows of the
// element to which it attached, if any.
class Attribute {
DISALLOW_NEW();
public:
Attribute(const QualifiedName& name, const AtomicString& value)
: name_(name), value_(value) {}
Attribute(QualifiedName&& name, AtomicString&& value)
: name_(std::move(name)), value_(std::move(value)) {}
// NOTE: The references returned by these functions are only valid for as long
// as the Attribute stays in place. For example, calling a function that
// mutates an Element's internal attribute storage may invalidate them.
const AtomicString& Value() const { return value_; }
const AtomicString& Prefix() const { return name_.Prefix(); }
const AtomicString& LocalName() const { return name_.LocalName(); }
const AtomicString& NamespaceURI() const { return name_.NamespaceURI(); }
const QualifiedName& GetName() const { return name_; }
bool IsEmpty() const { return value_.empty(); }
bool Matches(const QualifiedName&) const;
bool MatchesCaseInsensitive(const QualifiedName&) const;
void SetValue(const AtomicString& value) { value_ = value; }
// Note: This API is only for HTMLTreeBuilder. It is not safe to change the
// name of an attribute once parseAttribute has been called as DOM
// elements may have placed the Attribute in a hash by name.
void ParserSetName(const QualifiedName& name) { name_ = name; }
#if defined(COMPILER_MSVC)
// NOTE: This constructor is not actually implemented, it's just defined so
// MSVC will let us use a zero-length array of Attributes.
Attribute();
#endif
bool operator==(const Attribute& other) const = default;
private:
QualifiedName name_;
AtomicString value_;
};
static_assert(sizeof(Attribute) == sizeof(QualifiedName) + sizeof(AtomicString),
"AttributeHash() assumes Attribute has no padding");
inline bool Attribute::Matches(const QualifiedName& qualified_name) const {
return (qualified_name.LocalName() == LocalName()) &&
(qualified_name.NamespaceURI() == NamespaceURI() ||
qualified_name.Prefix() == g_star_atom);
}
inline bool Attribute::MatchesCaseInsensitive(
const QualifiedName& qualified_name) const {
return qualified_name.LocalNameUpper() == name_.LocalNameUpper() &&
(qualified_name.NamespaceURI() == NamespaceURI() ||
qualified_name.Prefix() == g_star_atom);
}
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_DOM_ATTRIBUTE_H_
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