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// Copyright 2014 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef COBALT_DOM_DOM_TOKEN_LIST_H_
#define COBALT_DOM_DOM_TOKEN_LIST_H_
#include <string>
#include <vector>
#include "base/memory/ref_counted.h"
#include "base/optional.h"
#include "cobalt/base/token.h"
#include "cobalt/dom/element.h"
#include "cobalt/script/wrappable.h"
namespace cobalt {
namespace dom {
// The DOMTokenList interface represents a set of space-separated tokens.
// https://www.w3.org/TR/dom/#domtokenlist
class DOMTokenList : public script::Wrappable {
public:
DOMTokenList(Element* element, const std::string& attr_name);
// Web API: DOMTokenList
//
unsigned int length() const;
base::optional<std::string> Item(unsigned int index) const;
bool Contains(const std::string& token) const;
void Add(const std::vector<std::string>& tokens);
void Remove(const std::vector<std::string>& tokens);
std::string AnonymousStringifier() const;
// Custom, not in any spec.
// This is a variation of Contains that should only be called in cases where
// the token has already been validated.
bool ContainsValid(base::Token valid_token) const;
// Returns a reference to the contained tokens for rapid iteration.
const std::vector<base::Token>& GetTokens() const;
// The associated element.
Element* element() { return element_; }
DEFINE_WRAPPABLE_TYPE(DOMTokenList);
void TraceMembers(script::Tracer* tracer) override;
private:
~DOMTokenList();
// From the spec: DOMTokenList.
// https://www.w3.org/TR/dom/#concept-dtl-update
void RunUpdateSteps() const;
// Returns if a token is valid.
bool IsTokenValid(const std::string& token) const;
// Refreshes the cache if it is not up to date.
void MaybeRefresh() const;
// The associated element, it is guaranteed to outlive the dom token list.
Element* element_;
// Name of the associated attribute.
std::string attr_name_;
// Node generation of the element when tokens is updated.
mutable uint32_t element_node_generation_;
// Cached tokens.
mutable std::vector<base::Token> tokens_;
DISALLOW_COPY_AND_ASSIGN(DOMTokenList);
};
} // namespace dom
} // namespace cobalt
#endif // COBALT_DOM_DOM_TOKEN_LIST_H_