import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

layout/style/nsHTMLCSSStyleSheet.cpp

@@ -0,0 +1,217 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 "mozilla/DeclarationBlockInlines.h"
+#include "nsIStyleRuleProcessor.h"
+#include "nsPresContext.h"
+#include "nsRuleWalker.h"
+#include "nsRuleProcessorData.h"
+#include "mozilla/dom/Element.h"
+#include "nsAttrValue.h"
+#include "nsAttrValueInlines.h"
+#include "nsCSSPseudoElements.h"
+#include "mozilla/RestyleManagerHandle.h"
+#include "mozilla/RestyleManagerHandleInlines.h"
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+nsHTMLCSSStyleSheet::nsHTMLCSSStyleSheet()
+{
+}
+
+nsHTMLCSSStyleSheet::~nsHTMLCSSStyleSheet()
+{
+  // We may go away before all of our cached style attributes do,
+  // so clean up any that are left.
+  for (auto iter = mCachedStyleAttrs.Iter(); !iter.Done(); iter.Next()) {
+    MiscContainer*& value = iter.Data();
+
+    // Ideally we'd just call MiscContainer::Evict, but we can't do that since
+    // we're iterating the hashtable.
+    if (value->mType == nsAttrValue::eCSSDeclaration) {
+      DeclarationBlock* declaration = value->mValue.mCSSDeclaration;
+      declaration->SetHTMLCSSStyleSheet(nullptr);
+    } else {
+      MOZ_ASSERT_UNREACHABLE("unexpected cached nsAttrValue type");
+    }
+
+    value->mValue.mCached = 0;
+    iter.Remove();
+  }
+}
+
+NS_IMPL_ISUPPORTS(nsHTMLCSSStyleSheet, nsIStyleRuleProcessor)
+
+/* virtual */ void
+nsHTMLCSSStyleSheet::RulesMatching(ElementRuleProcessorData* aData)
+{
+  ElementRulesMatching(aData->mPresContext, aData->mElement,
+                       aData->mRuleWalker);
+}
+
+void
+nsHTMLCSSStyleSheet::ElementRulesMatching(nsPresContext* aPresContext,
+                                          Element* aElement,
+                                          nsRuleWalker* aRuleWalker)
+{
+  // just get the one and only style rule from the content's STYLE attribute
+  DeclarationBlock* declaration = aElement->GetInlineStyleDeclaration();
+  if (declaration) {
+    declaration->SetImmutable();
+    aRuleWalker->Forward(declaration->AsGecko());
+  }
+
+  declaration = aElement->GetSMILOverrideStyleDeclaration();
+  if (declaration) {
+    MOZ_ASSERT(aPresContext->RestyleManager()->IsGecko(),
+               "stylo: ElementRulesMatching must not be called when we have "
+               "a Servo-backed style system");
+    RestyleManager* restyleManager = aPresContext->RestyleManager()->AsGecko();
+    if (!restyleManager->SkipAnimationRules()) {
+      // Animation restyle (or non-restyle traversal of rules)
+      // Now we can walk SMIL overrride style, without triggering transitions.
+      declaration->SetImmutable();
+      aRuleWalker->Forward(declaration->AsGecko());
+    }
+  }
+}
+
+void
+nsHTMLCSSStyleSheet::PseudoElementRulesMatching(Element* aPseudoElement,
+                                                CSSPseudoElementType
+                                                  aPseudoType,
+                                                nsRuleWalker* aRuleWalker)
+{
+  MOZ_ASSERT(nsCSSPseudoElements::
+               PseudoElementSupportsStyleAttribute(aPseudoType));
+  MOZ_ASSERT(aPseudoElement);
+
+  // just get the one and only style rule from the content's STYLE attribute
+  DeclarationBlock* declaration = aPseudoElement->GetInlineStyleDeclaration();
+  if (declaration) {
+    declaration->SetImmutable();
+    aRuleWalker->Forward(declaration->AsGecko());
+  }
+}
+
+/* virtual */ void
+nsHTMLCSSStyleSheet::RulesMatching(PseudoElementRuleProcessorData* aData)
+{
+  if (nsCSSPseudoElements::PseudoElementSupportsStyleAttribute(aData->mPseudoType) &&
+      aData->mPseudoElement) {
+    PseudoElementRulesMatching(aData->mPseudoElement, aData->mPseudoType,
+                               aData->mRuleWalker);
+  }
+}
+
+/* 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,
+    RestyleHintData& aRestyleHintDataResult)
+{
+  // 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_StyleAttribute;
+  }
+
+  return nsRestyleHint(0);
+}
+
+/* virtual */ bool
+nsHTMLCSSStyleSheet::MediumFeaturesChanged(nsPresContext* aPresContext)
+{
+  return false;
+}
+
+/* virtual */ size_t
+nsHTMLCSSStyleSheet::SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
+{
+  // The size of mCachedStyleAttrs's mTable member (a PLDHashTable) is
+  // significant in itself, but more significant is the size of the nsString
+  // members of the nsStringHashKeys.
+  size_t n = 0;
+  n += mCachedStyleAttrs.ShallowSizeOfExcludingThis(aMallocSizeOf);
+  for (auto iter = mCachedStyleAttrs.ConstIter(); !iter.Done(); iter.Next()) {
+    // We don't own the MiscContainers (the hash table values) so we don't
+    // count them. We do care about the size of the nsString members in the
+    // keys though.
+    n += iter.Key().SizeOfExcludingThisIfUnshared(aMallocSizeOf);
+  }
+  return n;
+}
+
+/* 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);
+}