/*
 * (C) 1999-2003 Lars Knoll (knoll@kde.org)
 * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
 * Copyright (C) 2002, 2005, 2006, 2007, 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.
 */

#include "third_party/blink/renderer/core/css/css_rule.h"

#include "third_party/blink/renderer/core/css/css_grouping_rule.h"
#include "third_party/blink/renderer/core/css/css_style_rule.h"
#include "third_party/blink/renderer/core/css/css_style_sheet.h"
#include "third_party/blink/renderer/core/css/style_rule.h"
#include "third_party/blink/renderer/core/css/style_sheet_contents.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/platform/wtf/size_assertions.h"

namespace blink {

struct SameSizeAsCSSRule : public GarbageCollected<SameSizeAsCSSRule>,
                           public ScriptWrappable {
  ~SameSizeAsCSSRule() override;
  unsigned char bitfields;
  Member<ScriptWrappable> member;
};

ASSERT_SIZE(CSSRule, SameSizeAsCSSRule);

CSSRule::CSSRule(CSSStyleSheet* parent)
    : has_cached_selector_text_(false),
      parent_is_rule_(false),
      parent_(parent) {}

const CSSParserContext* CSSRule::ParserContext(
    SecureContextMode secure_context_mode) const {
  CSSStyleSheet* style_sheet = parentStyleSheet();
  return style_sheet ? style_sheet->Contents()->ParserContext()
                     : StrictCSSParserContext(secure_context_mode);
}

void CSSRule::CountUse(WebFeature feature) const {
  CSSStyleSheet* style_sheet = parentStyleSheet();
  Document* document = style_sheet ? style_sheet->OwnerDocument() : nullptr;
  if (document) {
    document->CountUse(feature);
  }
}

wtf_size_t CSSRule::ReplaceChildRuleInParentIfExists(StyleRuleBase* old_rule,
                                                     StyleRuleBase* new_rule,
                                                     wtf_size_t position_hint) {
  CSSRule* parent_rule = parentRule();
  if (auto* style_rule = DynamicTo<CSSStyleRule>(parent_rule)) {
    return style_rule->GetStyleRule()->ReplaceChildRuleIfExists(
        old_rule, new_rule, position_hint);
  }
  if (auto* grouping_rule = DynamicTo<CSSGroupingRule>(parent_rule)) {
    return grouping_rule->GroupRule()->ReplaceChildRuleIfExists(
        old_rule, new_rule, position_hint);
  }
  if (CSSStyleSheet* parent_stylesheet = parentStyleSheet()) {
    StyleSheetContents* contents = parent_stylesheet->Contents();
    CHECK(contents);
    return contents->ReplaceChildRuleIfExists(old_rule, new_rule,
                                              position_hint);
  }
  return std::numeric_limits<wtf_size_t>::max();  // Not found.
}

void CSSRule::SetParentStyleSheet(CSSStyleSheet* style_sheet) {
  parent_is_rule_ = false;
  parent_ = style_sheet;
}

void CSSRule::SetParentRule(CSSRule* rule) {
  parent_is_rule_ = true;
  parent_ = rule;
}

void CSSRule::Trace(Visitor* visitor) const {
  visitor->Trace(parent_);
  ScriptWrappable::Trace(visitor);
}

bool CSSRule::VerifyParentIsCSSRule() const {
  return !parent_ || ToWrapperTypeInfo(parent_)->IsSubclass(
                         CSSRule::GetStaticWrapperTypeInfo());
}
bool CSSRule::VerifyParentIsCSSStyleSheet() const {
  return !parent_ || ToWrapperTypeInfo(parent_)->IsSubclass(
                         CSSStyleSheet::GetStaticWrapperTypeInfo());
}

}  // namespace blink