The Tor Browser: layout/style/nsHTMLStyleSheet.cpp@7e26c7da4463 (annotated)

layout/style/nsHTMLStyleSheet.cpp@7e26c7da4463 (annotated)

layout/style/nsHTMLStyleSheet.cpp

Wed, 31 Dec 2014 06:55:50 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:55:50 +0100
changeset 2: 7e26c7da4463
permissions: -rw-r--r--

Added tag UPSTREAM_283F7C6 for changeset ca08bd8f51b2

 /* -*- 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/.
  *
  * This Original Code has been modified by IBM Corporation. Modifications made by IBM
  * described herein are Copyright (c) International Business Machines Corporation, 2000.
  * Modifications to Mozilla code or documentation identified per MPL Section 3.3
  *
  * Date             Modified by     Description of modification
  * 04/20/2000       IBM Corp.      OS/2 VisualAge build.
  */
 /*
  * style sheet and style rule processor representing data from presentational
  * HTML attributes
  */
 #include "nsHTMLStyleSheet.h"
 #include "nsMappedAttributes.h"
 #include "nsGkAtoms.h"
 #include "nsPresContext.h"
 #include "mozilla/EventStates.h"
 #include "nsIDocument.h"
 #include "nsIPresShell.h"
 #include "nsStyleConsts.h"
 #include "nsRuleWalker.h"
 #include "nsRuleData.h"
 #include "nsError.h"
 #include "nsRuleProcessorData.h"
 #include "nsCSSRuleProcessor.h"
 #include "mozilla/MemoryReporting.h"
 #include "mozilla/dom/Element.h"
 #include "nsHashKeys.h"
 #include "RestyleManager.h"
 using namespace mozilla;
 using namespace mozilla::dom;
 NS_IMPL_ISUPPORTS(nsHTMLStyleSheet::HTMLColorRule, nsIStyleRule)
 /* virtual */ void
 nsHTMLStyleSheet::HTMLColorRule::MapRuleInfoInto(nsRuleData* aRuleData)
 {
   if (aRuleData->mSIDs & NS_STYLE_INHERIT_BIT(Color)) {
     nsCSSValue* color = aRuleData->ValueForColor();
     if (color->GetUnit() == eCSSUnit_Null &&
         aRuleData->mPresContext->UseDocumentColors())
       color->SetColorValue(mColor);
   }
 }
 #ifdef DEBUG
 /* virtual */ void
 nsHTMLStyleSheet::HTMLColorRule::List(FILE* out, int32_t aIndent) const
 {
   for (int32_t index = aIndent; --index >= 0; ) fputs("  ", out);
   fputs("[html color rule] {}\n", out);
 }
 #endif
 NS_IMPL_ISUPPORTS(nsHTMLStyleSheet::GenericTableRule, nsIStyleRule)
 #ifdef DEBUG
 /* virtual */ void
 nsHTMLStyleSheet::GenericTableRule::List(FILE* out, int32_t aIndent) const
 {
   for (int32_t index = aIndent; --index >= 0; ) fputs("  ", out);
   fputs("[generic table rule] {}\n", out);
 }
 #endif
 /* virtual */ void
 nsHTMLStyleSheet::TableTHRule::MapRuleInfoInto(nsRuleData* aRuleData)
 {
   if (aRuleData->mSIDs & NS_STYLE_INHERIT_BIT(Text)) {
     nsCSSValue* textAlign = aRuleData->ValueForTextAlign();
     if (textAlign->GetUnit() == eCSSUnit_Null) {
       textAlign->SetIntValue(NS_STYLE_TEXT_ALIGN_MOZ_CENTER_OR_INHERIT,
                              eCSSUnit_Enumerated);
     }
   }
 }
 /* virtual */ void
 nsHTMLStyleSheet::TableQuirkColorRule::MapRuleInfoInto(nsRuleData* aRuleData)
 {
   if (aRuleData->mSIDs & NS_STYLE_INHERIT_BIT(Color)) {
     nsCSSValue* color = aRuleData->ValueForColor();
     // We do not check UseDocumentColors() here, because we want to
     // use the body color no matter what.
     if (color->GetUnit() == eCSSUnit_Null)
       color->SetIntValue(NS_STYLE_COLOR_INHERIT_FROM_BODY,
                          eCSSUnit_Enumerated);
   }
 }
 NS_IMPL_ISUPPORTS(nsHTMLStyleSheet::LangRule, nsIStyleRule)
 /* virtual */ void
 nsHTMLStyleSheet::LangRule::MapRuleInfoInto(nsRuleData* aRuleData)
 {
   if (aRuleData->mSIDs & NS_STYLE_INHERIT_BIT(Font)) {
     nsCSSValue* lang = aRuleData->ValueForLang();
     if (lang->GetUnit() == eCSSUnit_Null) {
       lang->SetStringValue(mLang, eCSSUnit_Ident);
     }
   }
 }
 #ifdef DEBUG
 /* virtual */ void
 nsHTMLStyleSheet::LangRule::List(FILE* out, int32_t aIndent) const
 {
   for (int32_t index = aIndent; --index >= 0; ) fputs("  ", out);
   fputs("[lang rule] { language: \"", out);
   fputs(NS_ConvertUTF16toUTF8(mLang).get(), out);
   fputs("\" }\n", out);
 }
 #endif
 // -----------------------------------------------------------
 struct MappedAttrTableEntry : public PLDHashEntryHdr {
   nsMappedAttributes *mAttributes;
 };
 static PLDHashNumber
 MappedAttrTable_HashKey(PLDHashTable *table, const void *key)
 {
   nsMappedAttributes *attributes =
     static_cast<nsMappedAttributes*>(const_cast<void*>(key));
   return attributes->HashValue();
 }
 static void
 MappedAttrTable_ClearEntry(PLDHashTable *table, PLDHashEntryHdr *hdr)
 {
   MappedAttrTableEntry *entry = static_cast<MappedAttrTableEntry*>(hdr);
   entry->mAttributes->DropStyleSheetReference();
   memset(entry, 0, sizeof(MappedAttrTableEntry));
 }
 static bool
 MappedAttrTable_MatchEntry(PLDHashTable *table, const PLDHashEntryHdr *hdr,
                            const void *key)
 {
   nsMappedAttributes *attributes =
     static_cast<nsMappedAttributes*>(const_cast<void*>(key));
   const MappedAttrTableEntry *entry =
     static_cast<const MappedAttrTableEntry*>(hdr);
   return attributes->Equals(entry->mAttributes);
 }
 static const PLDHashTableOps MappedAttrTable_Ops = {
   PL_DHashAllocTable,
   PL_DHashFreeTable,
   MappedAttrTable_HashKey,
   MappedAttrTable_MatchEntry,
   PL_DHashMoveEntryStub,
   MappedAttrTable_ClearEntry,
   PL_DHashFinalizeStub,
   nullptr
 };
 // -----------------------------------------------------------
 struct LangRuleTableEntry : public PLDHashEntryHdr {
   nsRefPtr<nsHTMLStyleSheet::LangRule> mRule;
 };
 static PLDHashNumber
 LangRuleTable_HashKey(PLDHashTable *table, const void *key)
 {
   const nsString *lang = static_cast<const nsString*>(key);
   return HashString(*lang);
 }
 static void
 LangRuleTable_ClearEntry(PLDHashTable *table, PLDHashEntryHdr *hdr)
 {
   LangRuleTableEntry *entry = static_cast<LangRuleTableEntry*>(hdr);
   entry->~LangRuleTableEntry();
   memset(entry, 0, sizeof(LangRuleTableEntry));
 }
 static bool
 LangRuleTable_MatchEntry(PLDHashTable *table, const PLDHashEntryHdr *hdr,
                          const void *key)
 {
   const nsString *lang = static_cast<const nsString*>(key);
   const LangRuleTableEntry *entry = static_cast<const LangRuleTableEntry*>(hdr);
   return entry->mRule->mLang == *lang;
 }
 static bool
 LangRuleTable_InitEntry(PLDHashTable *table, PLDHashEntryHdr *hdr,
                         const void *key)
 {
   const nsString *lang = static_cast<const nsString*>(key);
   LangRuleTableEntry *entry = new (hdr) LangRuleTableEntry();
   // Create the unique rule for this language
   entry->mRule = new nsHTMLStyleSheet::LangRule(*lang);
   return true;
 }
 static const PLDHashTableOps LangRuleTable_Ops = {
   PL_DHashAllocTable,
   PL_DHashFreeTable,
   LangRuleTable_HashKey,
   LangRuleTable_MatchEntry,
   PL_DHashMoveEntryStub,
   LangRuleTable_ClearEntry,
   PL_DHashFinalizeStub,
   LangRuleTable_InitEntry
 };
 // -----------------------------------------------------------
 nsHTMLStyleSheet::nsHTMLStyleSheet(nsIDocument* aDocument)
   : mDocument(aDocument)
   , mTableQuirkColorRule(new TableQuirkColorRule())
   , mTableTHRule(new TableTHRule())
 {
   MOZ_ASSERT(aDocument);
   mMappedAttrTable.ops = nullptr;
   mLangRuleTable.ops = nullptr;
 }
 nsHTMLStyleSheet::~nsHTMLStyleSheet()
 {
   if (mLangRuleTable.ops)
     PL_DHashTableFinish(&mLangRuleTable);
   if (mMappedAttrTable.ops)
     PL_DHashTableFinish(&mMappedAttrTable);
 }
 NS_IMPL_ISUPPORTS(nsHTMLStyleSheet, nsIStyleRuleProcessor)
 /* virtual */ void
 nsHTMLStyleSheet::RulesMatching(ElementRuleProcessorData* aData)
 {
   nsRuleWalker *ruleWalker = aData->mRuleWalker;
   if (aData->mElement->IsHTML() && !ruleWalker->AuthorStyleDisabled()) {
     nsIAtom* tag = aData->mElement->Tag();
     // if we have anchor colors, check if this is an anchor with an href
     if (tag == nsGkAtoms::a) {
       if (mLinkRule || mVisitedRule || mActiveRule) {
         EventStates state =
           nsCSSRuleProcessor::GetContentStateForVisitedHandling(
                                   aData->mElement,
                                   aData->mTreeMatchContext,
                                   aData->mTreeMatchContext.VisitedHandling(),
                                   // If the node being matched is a link,
                                   // it's the relevant link.
                                   nsCSSRuleProcessor::IsLink(aData->mElement));
         if (mLinkRule && state.HasState(NS_EVENT_STATE_UNVISITED)) {
           ruleWalker->Forward(mLinkRule);
           aData->mTreeMatchContext.SetHaveRelevantLink();
         }
         else if (mVisitedRule && state.HasState(NS_EVENT_STATE_VISITED)) {
           ruleWalker->Forward(mVisitedRule);
           aData->mTreeMatchContext.SetHaveRelevantLink();
         }
         // No need to add to the active rule if it's not a link
         if (mActiveRule && nsCSSRuleProcessor::IsLink(aData->mElement) &&
             state.HasState(NS_EVENT_STATE_ACTIVE)) {
           ruleWalker->Forward(mActiveRule);
         }
       } // end link/visited/active rules
     } // end A tag
     // add the rule to handle text-align for a <th>
     else if (tag == nsGkAtoms::th) {
       ruleWalker->Forward(mTableTHRule);
     }
     else if (tag == nsGkAtoms::table) {
       if (aData->mTreeMatchContext.mCompatMode == eCompatibility_NavQuirks) {
         ruleWalker->Forward(mTableQuirkColorRule);
       }
     }
   } // end html element
   // just get the style rules from the content.  For SVG we do this even if
   // author style is disabled, because SVG presentational hints aren't
   // considered style.
   if (!ruleWalker->AuthorStyleDisabled() || aData->mElement->IsSVG()) {
     aData->mElement->WalkContentStyleRules(ruleWalker);
   }
   // http://www.whatwg.org/specs/web-apps/current-work/multipage/elements.html#language
   // says that the xml:lang attribute overrides HTML's lang attribute,
   // so we need to do this after WalkContentStyleRules.
   nsString lang;
   if (aData->mElement->GetAttr(kNameSpaceID_XML, nsGkAtoms::lang, lang)) {
     ruleWalker->Forward(LangRuleFor(lang));
   }
 }
 // Test if style is dependent on content state
 /* virtual */ nsRestyleHint
 nsHTMLStyleSheet::HasStateDependentStyle(StateRuleProcessorData* aData)
 {
   if (aData->mElement->IsHTML(nsGkAtoms::a) &&
       nsCSSRuleProcessor::IsLink(aData->mElement) &&
       ((mActiveRule && aData->mStateMask.HasState(NS_EVENT_STATE_ACTIVE)) ||
        (mLinkRule && aData->mStateMask.HasState(NS_EVENT_STATE_VISITED)) ||
        (mVisitedRule && aData->mStateMask.HasState(NS_EVENT_STATE_VISITED)))) {
     return eRestyle_Self;
   }
   return nsRestyleHint(0);
 }
 /* virtual */ nsRestyleHint
 nsHTMLStyleSheet::HasStateDependentStyle(PseudoElementStateRuleProcessorData* aData)
 {
   return nsRestyleHint(0);
 }
 /* virtual */ bool
 nsHTMLStyleSheet::HasDocumentStateDependentStyle(StateRuleProcessorData* aData)
 {
   return false;
 }
 /* virtual */ nsRestyleHint
 nsHTMLStyleSheet::HasAttributeDependentStyle(AttributeRuleProcessorData* aData)
 {
   // Do nothing on before-change checks
   if (!aData->mAttrHasChanged) {
     return nsRestyleHint(0);
   }
   // Note: no need to worry about whether some states changed with this
   // attribute here, because we handle that under HasStateDependentStyle() as
   // needed.
   // Result is true for |href| changes on HTML links if we have link rules.
   Element *element = aData->mElement;
   if (aData->mAttribute == nsGkAtoms::href &&
       (mLinkRule || mVisitedRule || mActiveRule) &&
       element->IsHTML(nsGkAtoms::a)) {
     return eRestyle_Self;
   }
   // Don't worry about the mDocumentColorRule since it only applies
   // to descendants of body, when we're already reresolving.
   // Handle the content style rules.
   if (element->IsAttributeMapped(aData->mAttribute)) {
     // cellpadding on tables is special and requires reresolving all
     // the cells in the table
     if (aData->mAttribute == nsGkAtoms::cellpadding &&
         element->IsHTML(nsGkAtoms::table)) {
       return eRestyle_Subtree;
     }
     return eRestyle_Self;
   }
   return nsRestyleHint(0);
 }
 /* virtual */ bool
 nsHTMLStyleSheet::MediumFeaturesChanged(nsPresContext* aPresContext)
 {
   return false;
 }
 /* virtual */ size_t
 nsHTMLStyleSheet::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const
 {
   return 0; // nsHTMLStyleSheets are charged to the DOM, not layout
 }
 /* virtual */ size_t
 nsHTMLStyleSheet::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
 {
   return 0; // nsHTMLStyleSheets are charged to the DOM, not layout
 }
 /* virtual */ void
 nsHTMLStyleSheet::RulesMatching(PseudoElementRuleProcessorData* aData)
 {
 }
 /* virtual */ void
 nsHTMLStyleSheet::RulesMatching(AnonBoxRuleProcessorData* aData)
 {
 }
 #ifdef MOZ_XUL
 /* virtual */ void
 nsHTMLStyleSheet::RulesMatching(XULTreeRuleProcessorData* aData)
 {
 }
 #endif
 void
 nsHTMLStyleSheet::SetOwningDocument(nsIDocument* aDocument)
 {
   mDocument = aDocument; // not refcounted
 }
 void
 nsHTMLStyleSheet::Reset()
 {
   mLinkRule          = nullptr;
   mVisitedRule       = nullptr;
   mActiveRule        = nullptr;
   if (mLangRuleTable.ops) {
     PL_DHashTableFinish(&mLangRuleTable);
     mLangRuleTable.ops = nullptr;
   }
   if (mMappedAttrTable.ops) {
     PL_DHashTableFinish(&mMappedAttrTable);
     mMappedAttrTable.ops = nullptr;
   }
 }
 nsresult
 nsHTMLStyleSheet::ImplLinkColorSetter(nsRefPtr<HTMLColorRule>& aRule, nscolor aColor)
 {
   if (aRule && aRule->mColor == aColor) {
     return NS_OK;
   }
   aRule = new HTMLColorRule();
   if (!aRule)
     return NS_ERROR_OUT_OF_MEMORY;
   aRule->mColor = aColor;
   // Now make sure we restyle any links that might need it.  This
   // shouldn't happen often, so just rebuilding everything is ok.
   if (mDocument && mDocument->GetShell()) {
     Element* root = mDocument->GetRootElement();
     if (root) {
       mDocument->GetShell()->GetPresContext()->RestyleManager()->
         PostRestyleEvent(root, eRestyle_Subtree, NS_STYLE_HINT_NONE);
     }
   }
   return NS_OK;
 }
 nsresult
 nsHTMLStyleSheet::SetLinkColor(nscolor aColor)
 {
   return ImplLinkColorSetter(mLinkRule, aColor);
 }
 nsresult
 nsHTMLStyleSheet::SetActiveLinkColor(nscolor aColor)
 {
   return ImplLinkColorSetter(mActiveRule, aColor);
 }
 nsresult
 nsHTMLStyleSheet::SetVisitedLinkColor(nscolor aColor)
 {
   return ImplLinkColorSetter(mVisitedRule, aColor);
 }
 already_AddRefed<nsMappedAttributes>
 nsHTMLStyleSheet::UniqueMappedAttributes(nsMappedAttributes* aMapped)
 {
   if (!mMappedAttrTable.ops) {
     PL_DHashTableInit(&mMappedAttrTable, &MappedAttrTable_Ops,
                       nullptr, sizeof(MappedAttrTableEntry), 16);
   }
   MappedAttrTableEntry *entry = static_cast<MappedAttrTableEntry*>
                                            (PL_DHashTableOperate(&mMappedAttrTable, aMapped, PL_DHASH_ADD));
   if (!entry)
     return nullptr;
   if (!entry->mAttributes) {
     // We added a new entry to the hashtable, so we have a new unique set.
     entry->mAttributes = aMapped;
   }
   nsRefPtr<nsMappedAttributes> ret = entry->mAttributes;
   return ret.forget();
 }
 void
 nsHTMLStyleSheet::DropMappedAttributes(nsMappedAttributes* aMapped)
 {
   NS_ENSURE_TRUE_VOID(aMapped);
   NS_ASSERTION(mMappedAttrTable.ops, "table uninitialized");
 #ifdef DEBUG
   uint32_t entryCount = mMappedAttrTable.entryCount - 1;
 #endif
   PL_DHashTableOperate(&mMappedAttrTable, aMapped, PL_DHASH_REMOVE);
   NS_ASSERTION(entryCount == mMappedAttrTable.entryCount, "not removed");
 }
 nsIStyleRule*
 nsHTMLStyleSheet::LangRuleFor(const nsString& aLanguage)
 {
   if (!mLangRuleTable.ops) {
     PL_DHashTableInit(&mLangRuleTable, &LangRuleTable_Ops,
                       nullptr, sizeof(LangRuleTableEntry), 16);
   }
   LangRuleTableEntry *entry = static_cast<LangRuleTableEntry*>
     (PL_DHashTableOperate(&mLangRuleTable, &aLanguage, PL_DHASH_ADD));
   if (!entry) {
     NS_ASSERTION(false, "out of memory");
     return nullptr;
   }
   return entry->mRule;
 }
 static size_t
 SizeOfAttributesEntryExcludingThis(PLDHashEntryHdr* aEntry,
                                    MallocSizeOf aMallocSizeOf,
                                    void* aArg)
 {
   NS_PRECONDITION(aEntry, "The entry should not be null!");
   MappedAttrTableEntry* entry = static_cast<MappedAttrTableEntry*>(aEntry);
   NS_ASSERTION(entry->mAttributes, "entry->mAttributes should not be null!");
   return entry->mAttributes->SizeOfIncludingThis(aMallocSizeOf);
 }
 size_t
 nsHTMLStyleSheet::DOMSizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
 {
   size_t n = aMallocSizeOf(this);
   if (mMappedAttrTable.ops) {
     n += PL_DHashTableSizeOfExcludingThis(&mMappedAttrTable,
                                           SizeOfAttributesEntryExcludingThis,
                                           aMallocSizeOf);
   }
   // Measurement of the following members may be added later if DMD finds it is
   // worthwhile:
   // - mURL
   // - mLinkRule
   // - mVisitedRule
   // - mActiveRule
   // - mTableQuirkColorRule
   // - mTableTHRule
   // - mLangRuleTable
   //
   // The following members are not measured:
   // - mDocument, because it's non-owning
   return n;
 }

The Tor Browser / annotate

layout/style/nsHTMLStyleSheet.cpp@7e26c7da4463 (annotated)

layout/style/nsHTMLStyleSheet.cpp