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 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

 /* This Source Code Form is subject to the terms of the Mozilla Public

  * License, v. 2.0. If a copy of the MPL was not distributed with this

  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

 /*

  * style sheet and style rule processor representing style attributes

  */

 #include "nsHTMLCSSStyleSheet.h"

 #include "mozilla/MemoryReporting.h"

 #include "mozilla/css/StyleRule.h"

 #include "nsIStyleRuleProcessor.h"

 #include "nsPresContext.h"

 #include "nsRuleWalker.h"

 #include "nsRuleProcessorData.h"

 #include "mozilla/dom/Element.h"

 #include "nsAttrValue.h"

 #include "nsAttrValueInlines.h"

 using namespace mozilla;

 using namespace mozilla::dom;

 namespace {

 PLDHashOperator

 ClearAttrCache(const nsAString& aKey, MiscContainer*& aValue, void*)

 {

   // Ideally we'd just call MiscContainer::Evict, but we can't do that since

   // we're iterating the hashtable.

   MOZ_ASSERT(aValue->mType == nsAttrValue::eCSSStyleRule);

   aValue->mValue.mCSSStyleRule->SetHTMLCSSStyleSheet(nullptr);

   aValue->mValue.mCached = 0;

   return PL_DHASH_REMOVE;

 }

 } // anonymous namespace

 nsHTMLCSSStyleSheet::nsHTMLCSSStyleSheet()

 {

 }

 nsHTMLCSSStyleSheet::~nsHTMLCSSStyleSheet()

 {

   // We may go away before all of our cached style attributes do,

   // so clean up any that are left.

   mCachedStyleAttrs.Enumerate(ClearAttrCache, nullptr);

 }

 NS_IMPL_ISUPPORTS(nsHTMLCSSStyleSheet, nsIStyleRuleProcessor)

 /* virtual */ void

 nsHTMLCSSStyleSheet::RulesMatching(ElementRuleProcessorData* aData)

 {

   Element* element = aData->mElement;

   // just get the one and only style rule from the content's STYLE attribute

   css::StyleRule* rule = element->GetInlineStyleRule();

   if (rule) {

     rule->RuleMatched();

     aData->mRuleWalker->Forward(rule);

   }

   rule = element->GetSMILOverrideStyleRule();

   if (rule) {

     if (aData->mPresContext->IsProcessingRestyles() &&

         !aData->mPresContext->IsProcessingAnimationStyleChange()) {

       // Non-animation restyle -- don't process SMIL override style, because we

       // don't want SMIL animation to trigger new CSS transitions. Instead,

       // request an Animation restyle, so we still get noticed.

       aData->mPresContext->PresShell()->RestyleForAnimation(element,

                                                             eRestyle_Self);

     } else {

       // Animation restyle (or non-restyle traversal of rules)

       // Now we can walk SMIL overrride style, without triggering transitions.

       rule->RuleMatched();

       aData->mRuleWalker->Forward(rule);

     }

   }

 }

 /* virtual */ void

 nsHTMLCSSStyleSheet::RulesMatching(PseudoElementRuleProcessorData* aData)

 {

   if (nsCSSPseudoElements::PseudoElementSupportsStyleAttribute(aData->mPseudoType)) {

     MOZ_ASSERT(aData->mPseudoElement,

         "If pseudo element is supposed to support style attribute, it must "

         "have a pseudo element set");

     // just get the one and only style rule from the content's STYLE attribute

     css::StyleRule* rule = aData->mPseudoElement->GetInlineStyleRule();

     if (rule) {

       rule->RuleMatched();

       aData->mRuleWalker->Forward(rule);

     }

   }

 }

 /* virtual */ void

 nsHTMLCSSStyleSheet::RulesMatching(AnonBoxRuleProcessorData* aData)

 {

 }

 #ifdef MOZ_XUL

 /* virtual */ void

 nsHTMLCSSStyleSheet::RulesMatching(XULTreeRuleProcessorData* aData)

 {

 }

 #endif

 // Test if style is dependent on content state

 /* virtual */ nsRestyleHint

 nsHTMLCSSStyleSheet::HasStateDependentStyle(StateRuleProcessorData* aData)

 {

   return nsRestyleHint(0);

 }

 /* virtual */ nsRestyleHint

 nsHTMLCSSStyleSheet::HasStateDependentStyle(PseudoElementStateRuleProcessorData* aData)

 {

   return nsRestyleHint(0);

 }

 /* virtual */ bool

 nsHTMLCSSStyleSheet::HasDocumentStateDependentStyle(StateRuleProcessorData* aData)

 {

   return false;

 }

 // Test if style is dependent on attribute

 /* virtual */ nsRestyleHint

 nsHTMLCSSStyleSheet::HasAttributeDependentStyle(AttributeRuleProcessorData* aData)

 {

   // Perhaps should check that it's XUL, SVG, (or HTML) namespace, but

   // it doesn't really matter.

   if (aData->mAttrHasChanged && aData->mAttribute == nsGkAtoms::style) {

     return eRestyle_Self;

   }

   return nsRestyleHint(0);

 }

 /* virtual */ bool

 nsHTMLCSSStyleSheet::MediumFeaturesChanged(nsPresContext* aPresContext)

 {

   return false;

 }

 /* virtual */ size_t

 nsHTMLCSSStyleSheet::SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const

 {

   return 0;

 }

 /* virtual */ size_t

 nsHTMLCSSStyleSheet::SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const

 {

   return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);

 }

 void

 nsHTMLCSSStyleSheet::CacheStyleAttr(const nsAString& aSerialized,

                                     MiscContainer* aValue)

 {

   mCachedStyleAttrs.Put(aSerialized, aValue);

 }

 void

 nsHTMLCSSStyleSheet::EvictStyleAttr(const nsAString& aSerialized,

                                     MiscContainer* aValue)

 {

 #ifdef DEBUG

   {

     NS_ASSERTION(aValue = mCachedStyleAttrs.Get(aSerialized),

                  "Cached value does not match?!");

   }

 #endif

   mCachedStyleAttrs.Remove(aSerialized);

 }

 MiscContainer*

 nsHTMLCSSStyleSheet::LookupStyleAttr(const nsAString& aSerialized)

 {

   return mCachedStyleAttrs.Get(aSerialized);

 }