third_party/WebKit/Source/core/html/ClassList.cpp

/*
 * Copyright (C) 2010 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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#include "core/html/ClassList.h"

#include "core/dom/Document.h"
#include "platform/wtf/PtrUtil.h"

namespace blink {

using namespace HTMLNames;

ClassList::ClassList(Element* element)
    : DOMTokenList(nullptr), element_(element) {}

unsigned ClassList::length() const {
  return element_->HasClass() ? ClassNames().size() : 0;
}

const AtomicString ClassList::item(unsigned index) const {
  if (index >= length())
    return AtomicString();
  return ClassNames()[index];
}

bool ClassList::ContainsInternal(const AtomicString& token) const {
  return element_->HasClass() && ClassNames().Contains(token);
}

const SpaceSplitString& ClassList::ClassNames() const {
  DCHECK(element_->HasClass());
  if (element_->GetDocument().InQuirksMode()) {
    if (!class_names_for_quirks_mode_)
      class_names_for_quirks_mode_ = WTF::WrapUnique(
          new SpaceSplitString(value(), SpaceSplitString::kShouldNotFoldCase));
    return *class_names_for_quirks_mode_.get();
  }
  return element_->ClassNames();
}

SpaceSplitString& ClassList::MutableSet() {
  // We can't mutate element_->ClassNames() because it is used to compare class
  // names before/after class attribute change.
  if (element_->HasClass())
    mutable_set_ = ClassNames();
  else
    mutable_set_ = SpaceSplitString();
  return mutable_set_;
}

DEFINE_TRACE(ClassList) {
  visitor->Trace(element_);
  DOMTokenList::Trace(visitor);
}

}  // namespace blink