/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* ***** BEGIN LICENSE BLOCK ***** * Version: MPL 1.1/GPL 2.0/LGPL 2.1 * * The contents of this file are subject to the Mozilla Public License Version * 1.1 (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Original Code is mozilla.org code. * * The Initial Developer of the Original Code is * Netscape Communications Corporation. * Portions created by the Initial Developer are Copyright (C) 1998 * the Initial Developer. All Rights Reserved. * * Contributor(s): * Daniel Glazman * Brian Ryner * L. David Baron , Mozilla Corporation * * Alternatively, the contents of this file may be used under the terms of * either of the GNU General Public License Version 2 or later (the "GPL"), * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), * in which case the provisions of the GPL or the LGPL are applicable instead * of those above. If you wish to allow use of your version of this file only * under the terms of either the GPL or the LGPL, and not to allow others to * use your version of this file under the terms of the MPL, indicate your * decision by deleting the provisions above and replace them with the notice * and other provisions required by the GPL or the LGPL. If you do not delete * the provisions above, a recipient may use your version of this file under * the terms of any one of the MPL, the GPL or the LGPL. * * ***** END LICENSE BLOCK ***** */ /* * the container for the style sheets that apply to a presentation, and * the internal API that the style system exposes for creating (and * potentially re-creating) style contexts */ #include "nsStyleSet.h" #include "nsNetUtil.h" #include "nsICSSStyleSheet.h" #include "nsIDocument.h" #include "nsRuleWalker.h" #include "nsStyleContext.h" #include "nsICSSStyleRule.h" #include "nsCSSAnonBoxes.h" #include "nsCSSPseudoElements.h" #include "nsCSSRuleProcessor.h" #include "nsIContent.h" #include "nsIFrame.h" #include "nsContentUtils.h" NS_IMPL_ISUPPORTS1(nsEmptyStyleRule, nsIStyleRule) NS_IMETHODIMP nsEmptyStyleRule::MapRuleInfoInto(nsRuleData* aRuleData) { return NS_OK; } #ifdef DEBUG NS_IMETHODIMP nsEmptyStyleRule::List(FILE* out, PRInt32 aIndent) const { return NS_OK; } #endif static const nsStyleSet::sheetType gCSSSheetTypes[] = { nsStyleSet::eAgentSheet, nsStyleSet::eUserSheet, nsStyleSet::eDocSheet, nsStyleSet::eOverrideSheet }; nsStyleSet::nsStyleSet() : mRuleTree(nsnull), mRuleWalker(nsnull), mDestroyedCount(0), mBatching(0), mInShutdown(PR_FALSE), mAuthorStyleDisabled(PR_FALSE), mInReconstruct(PR_FALSE), mDirty(0) { } nsresult nsStyleSet::Init(nsPresContext *aPresContext) { mFirstLineRule = new nsEmptyStyleRule; mFirstLetterRule = new nsEmptyStyleRule; if (!mFirstLineRule || !mFirstLetterRule) { return NS_ERROR_OUT_OF_MEMORY; } if (!BuildDefaultStyleData(aPresContext)) { mDefaultStyleData.Destroy(0, aPresContext); return NS_ERROR_OUT_OF_MEMORY; } mRuleTree = nsRuleNode::CreateRootNode(aPresContext); if (!mRuleTree) { mDefaultStyleData.Destroy(0, aPresContext); return NS_ERROR_OUT_OF_MEMORY; } mRuleWalker = new nsRuleWalker(mRuleTree); if (!mRuleWalker) { mRuleTree->Destroy(); mDefaultStyleData.Destroy(0, aPresContext); return NS_ERROR_OUT_OF_MEMORY; } return NS_OK; } nsresult nsStyleSet::BeginReconstruct() { NS_ASSERTION(!mInReconstruct, "Unmatched begin/end?"); NS_ASSERTION(mRuleTree, "Reconstructing before first construction?"); // Create a new rule tree root nsRuleNode* newTree = nsRuleNode::CreateRootNode(mRuleTree->GetPresContext()); if (!newTree) return NS_ERROR_OUT_OF_MEMORY; nsRuleWalker* ruleWalker = new nsRuleWalker(newTree); if (!ruleWalker) { newTree->Destroy(); return NS_ERROR_OUT_OF_MEMORY; } // Save the old rule tree so we can destroy it later if (!mOldRuleTrees.AppendElement(mRuleTree)) { delete ruleWalker; newTree->Destroy(); return NS_ERROR_OUT_OF_MEMORY; } // Delete mRuleWalker because it holds a reference to the rule tree root delete mRuleWalker; // We need to keep mRoots so that the rule tree GC will only free the // rule trees that really aren't referenced anymore (which should be // all of them, if there are no bugs in reresolution code). mInReconstruct = PR_TRUE; mRuleTree = newTree; mRuleWalker = ruleWalker; return NS_OK; } void nsStyleSet::EndReconstruct() { NS_ASSERTION(mInReconstruct, "Unmatched begin/end?"); mInReconstruct = PR_FALSE; #ifdef DEBUG for (PRInt32 i = mRoots.Length() - 1; i >= 0; --i) { nsRuleNode *n = mRoots[i]->GetRuleNode(); while (n->GetParent()) { n = n->GetParent(); } // Since nsStyleContext's mParent and mRuleNode are immutable, and // style contexts own their parents, and nsStyleContext asserts in // its constructor that the style context and its parent are in the // same rule tree, we don't need to check any of the children of // mRoots; we only need to check the rule nodes of mRoots // themselves. NS_ASSERTION(n == mRuleTree, "style context has old rule node"); } #endif // This *should* destroy the only element of mOldRuleTrees, but in // case of some bugs (which would trigger the above assertions), it // won't. GCRuleTrees(); } void nsStyleSet::SetQuirkStyleSheet(nsIStyleSheet* aQuirkStyleSheet) { NS_ASSERTION(aQuirkStyleSheet, "Must have quirk sheet if this is called"); NS_ASSERTION(!mQuirkStyleSheet, "Multiple calls to SetQuirkStyleSheet?"); NS_ASSERTION(mSheets[eAgentSheet].IndexOf(aQuirkStyleSheet) != -1, "Quirk style sheet not one of our agent sheets?"); mQuirkStyleSheet = aQuirkStyleSheet; } nsresult nsStyleSet::GatherRuleProcessors(sheetType aType) { mRuleProcessors[aType] = nsnull; if (mAuthorStyleDisabled && (aType == eDocSheet || aType == ePresHintSheet || aType == eHTMLPresHintSheet || aType == eStyleAttrSheet)) { //don't regather if this level is disabled return NS_OK; } if (mSheets[aType].Count()) { switch (aType) { case eAgentSheet: case eUserSheet: case eDocSheet: case eOverrideSheet: { // levels containing CSS stylesheets nsCOMArray& sheets = mSheets[aType]; nsCOMArray cssSheets(sheets.Count()); for (PRInt32 i = 0, i_end = sheets.Count(); i < i_end; ++i) { nsCOMPtr cssSheet = do_QueryInterface(sheets[i]); NS_ASSERTION(cssSheet, "not a CSS sheet"); cssSheets.AppendObject(cssSheet); } mRuleProcessors[aType] = new nsCSSRuleProcessor(cssSheets, PRUint8(aType)); } break; default: // levels containing non-CSS stylesheets NS_ASSERTION(mSheets[aType].Count() == 1, "only one sheet per level"); mRuleProcessors[aType] = do_QueryInterface(mSheets[aType][0]); break; } } return NS_OK; } #ifdef DEBUG #define CHECK_APPLICABLE \ PR_BEGIN_MACRO \ PRBool applicable = PR_TRUE; \ aSheet->GetApplicable(applicable); \ NS_ASSERTION(applicable, "Inapplicable sheet being placed in style set"); \ PR_END_MACRO #else #define CHECK_APPLICABLE #endif nsresult nsStyleSet::AppendStyleSheet(sheetType aType, nsIStyleSheet *aSheet) { NS_PRECONDITION(aSheet, "null arg"); CHECK_APPLICABLE; mSheets[aType].RemoveObject(aSheet); if (!mSheets[aType].AppendObject(aSheet)) return NS_ERROR_OUT_OF_MEMORY; if (!mBatching) return GatherRuleProcessors(aType); mDirty |= 1 << aType; return NS_OK; } nsresult nsStyleSet::PrependStyleSheet(sheetType aType, nsIStyleSheet *aSheet) { NS_PRECONDITION(aSheet, "null arg"); CHECK_APPLICABLE; mSheets[aType].RemoveObject(aSheet); if (!mSheets[aType].InsertObjectAt(aSheet, 0)) return NS_ERROR_OUT_OF_MEMORY; if (!mBatching) return GatherRuleProcessors(aType); mDirty |= 1 << aType; return NS_OK; } nsresult nsStyleSet::RemoveStyleSheet(sheetType aType, nsIStyleSheet *aSheet) { NS_PRECONDITION(aSheet, "null arg"); #ifdef DEBUG PRBool complete = PR_TRUE; aSheet->GetComplete(complete); NS_ASSERTION(complete, "Incomplete sheet being removed from style set"); #endif mSheets[aType].RemoveObject(aSheet); if (!mBatching) return GatherRuleProcessors(aType); mDirty |= 1 << aType; return NS_OK; } nsresult nsStyleSet::ReplaceSheets(sheetType aType, const nsCOMArray &aNewSheets) { mSheets[aType].Clear(); if (!mSheets[aType].AppendObjects(aNewSheets)) return NS_ERROR_OUT_OF_MEMORY; if (!mBatching) return GatherRuleProcessors(aType); mDirty |= 1 << aType; return NS_OK; } PRBool nsStyleSet::GetAuthorStyleDisabled() { return mAuthorStyleDisabled; } nsresult nsStyleSet::SetAuthorStyleDisabled(PRBool aStyleDisabled) { if (aStyleDisabled == !mAuthorStyleDisabled) { mAuthorStyleDisabled = aStyleDisabled; BeginUpdate(); mDirty |= 1 << eDocSheet | 1 << ePresHintSheet | 1 << eHTMLPresHintSheet | 1 << eStyleAttrSheet; return EndUpdate(); } return NS_OK; } // -------- Doc Sheets nsresult nsStyleSet::AddDocStyleSheet(nsIStyleSheet* aSheet, nsIDocument* aDocument) { NS_PRECONDITION(aSheet && aDocument, "null arg"); CHECK_APPLICABLE; nsCOMArray& docSheets = mSheets[eDocSheet]; docSheets.RemoveObject(aSheet); // lowest index first PRInt32 newDocIndex = aDocument->GetIndexOfStyleSheet(aSheet); PRInt32 count = docSheets.Count(); PRInt32 index; for (index = 0; index < count; index++) { nsIStyleSheet* sheet = docSheets.ObjectAt(index); PRInt32 sheetDocIndex = aDocument->GetIndexOfStyleSheet(sheet); if (sheetDocIndex > newDocIndex) break; } if (!docSheets.InsertObjectAt(aSheet, index)) return NS_ERROR_OUT_OF_MEMORY; if (!mBatching) return GatherRuleProcessors(eDocSheet); mDirty |= 1 << eDocSheet; return NS_OK; } #undef CHECK_APPLICABLE // Batching void nsStyleSet::BeginUpdate() { ++mBatching; } nsresult nsStyleSet::EndUpdate() { NS_ASSERTION(mBatching > 0, "Unbalanced EndUpdate"); if (--mBatching) { // We're not completely done yet. return NS_OK; } for (int i = 0; i < eSheetTypeCount; ++i) { if (mDirty & (1 << i)) { nsresult rv = GatherRuleProcessors(sheetType(i)); NS_ENSURE_SUCCESS(rv, rv); } } mDirty = 0; return NS_OK; } void nsStyleSet::EnableQuirkStyleSheet(PRBool aEnable) { #ifdef DEBUG PRBool oldEnabled; { nsCOMPtr domSheet = do_QueryInterface(mQuirkStyleSheet); domSheet->GetDisabled(&oldEnabled); oldEnabled = !oldEnabled; } #endif mQuirkStyleSheet->SetEnabled(aEnable); #ifdef DEBUG // This should always be OK, since SetEnabled should call // ClearRuleCascades. // Note that we can hit this codepath multiple times when document.open() // (potentially implied) happens multiple times. if (mRuleProcessors[eAgentSheet] && aEnable != oldEnabled) { static_cast(static_cast( mRuleProcessors[eAgentSheet]))->AssertQuirksChangeOK(); } #endif } static PRBool EnumRulesMatching(nsIStyleRuleProcessor* aProcessor, void* aData) { ElementRuleProcessorData* data = static_cast(aData); aProcessor->RulesMatching(data); return PR_TRUE; } /** * |GetContext| implements sharing of style contexts (not just the data * on the rule nodes) between siblings and cousins of the same * generation. (It works for cousins of the same generation since * |aParentContext| could itself be a shared context.) */ already_AddRefed nsStyleSet::GetContext(nsPresContext* aPresContext, nsStyleContext* aParentContext, nsIAtom* aPseudoTag) { nsStyleContext* result = nsnull; nsRuleNode* ruleNode = mRuleWalker->GetCurrentNode(); if (aParentContext) result = aParentContext->FindChildWithRules(aPseudoTag, ruleNode).get(); #ifdef NOISY_DEBUG if (result) fprintf(stdout, "--- SharedSC %d ---\n", ++gSharedCount); else fprintf(stdout, "+++ NewSC %d +++\n", ++gNewCount); #endif if (!result) { result = NS_NewStyleContext(aParentContext, aPseudoTag, ruleNode, aPresContext).get(); if (!aParentContext && result) mRoots.AppendElement(result); } return result; } void nsStyleSet::AddImportantRules(nsRuleNode* aCurrLevelNode, nsRuleNode* aLastPrevLevelNode) { if (!aCurrLevelNode) return; nsAutoTArray, 16> importantRules; for (nsRuleNode *node = aCurrLevelNode; node != aLastPrevLevelNode; node = node->GetParent()) { nsIStyleRule *rule = node->GetRule(); nsCOMPtr cssRule(do_QueryInterface(rule)); if (cssRule) { nsCOMPtr impRule = cssRule->GetImportantRule(); if (impRule) importantRules.AppendElement(impRule); } } for (PRUint32 i = importantRules.Length(); i-- != 0; ) { mRuleWalker->Forward(importantRules[i]); } } #ifdef DEBUG void nsStyleSet::AssertNoImportantRules(nsRuleNode* aCurrLevelNode, nsRuleNode* aLastPrevLevelNode) { if (!aCurrLevelNode) return; for (nsRuleNode *node = aCurrLevelNode; node != aLastPrevLevelNode; node = node->GetParent()) { nsIStyleRule *rule = node->GetRule(); nsCOMPtr cssRule(do_QueryInterface(rule)); if (cssRule) { nsCOMPtr impRule = cssRule->GetImportantRule(); NS_ASSERTION(!impRule, "Unexpected important rule"); } } } void nsStyleSet::AssertNoCSSRules(nsRuleNode* aCurrLevelNode, nsRuleNode* aLastPrevLevelNode) { if (!aCurrLevelNode) return; for (nsRuleNode *node = aCurrLevelNode; node != aLastPrevLevelNode; node = node->GetParent()) { nsIStyleRule *rule = node->GetRule(); nsCOMPtr cssRule(do_QueryInterface(rule)); NS_ASSERTION(!cssRule || !cssRule->Selector(), "Unexpected CSS rule"); } } #endif // Enumerate the rules in a way that cares about the order of the rules. void nsStyleSet::FileRules(nsIStyleRuleProcessor::EnumFunc aCollectorFunc, RuleProcessorData* aData) { // Cascading order: // [least important] // 1. UA normal rules = Agent normal // 2. Presentation hints = PresHint normal // 3. User normal rules = User normal // 4. HTML Presentation hints = HTMLPresHint normal // 5. Author normal rules = Document normal // 6. Override normal rules = Override normal // 7. Author !important rules = Document !important // 8. Override !important rules = Override !important // 9. User !important rules = User !important // 10. UA !important rules = Agent !important // [most important] NS_PRECONDITION(SheetCount(ePresHintSheet) == 0 || SheetCount(eHTMLPresHintSheet) == 0, "Can't have both types of preshint sheets at once!"); mRuleWalker->SetLevel(eAgentSheet, PR_FALSE); if (mRuleProcessors[eAgentSheet]) (*aCollectorFunc)(mRuleProcessors[eAgentSheet], aData); nsRuleNode* lastAgentRN = mRuleWalker->GetCurrentNode(); mRuleWalker->SetLevel(ePresHintSheet, PR_FALSE); if (mRuleProcessors[ePresHintSheet]) (*aCollectorFunc)(mRuleProcessors[ePresHintSheet], aData); nsRuleNode* lastPresHintRN = mRuleWalker->GetCurrentNode(); mRuleWalker->SetLevel(eUserSheet, PR_FALSE); PRBool skipUserStyles = aData->mContent && aData->mContent->IsInNativeAnonymousSubtree(); if (!skipUserStyles && mRuleProcessors[eUserSheet]) // NOTE: different (*aCollectorFunc)(mRuleProcessors[eUserSheet], aData); nsRuleNode* lastUserRN = mRuleWalker->GetCurrentNode(); mRuleWalker->SetLevel(eHTMLPresHintSheet, PR_FALSE); if (mRuleProcessors[eHTMLPresHintSheet]) (*aCollectorFunc)(mRuleProcessors[eHTMLPresHintSheet], aData); nsRuleNode* lastHTMLPresHintRN = mRuleWalker->GetCurrentNode(); mRuleWalker->SetLevel(eDocSheet, PR_FALSE); PRBool cutOffInheritance = PR_FALSE; if (mBindingManager) { // We can supply additional document-level sheets that should be walked. mBindingManager->WalkRules(aCollectorFunc, aData, &cutOffInheritance); } if (!skipUserStyles && !cutOffInheritance && mRuleProcessors[eDocSheet]) // NOTE: different (*aCollectorFunc)(mRuleProcessors[eDocSheet], aData); mRuleWalker->SetLevel(eStyleAttrSheet, PR_FALSE); if (mRuleProcessors[eStyleAttrSheet]) (*aCollectorFunc)(mRuleProcessors[eStyleAttrSheet], aData); nsRuleNode* lastDocRN = mRuleWalker->GetCurrentNode(); mRuleWalker->SetLevel(eOverrideSheet, PR_FALSE); if (mRuleProcessors[eOverrideSheet]) (*aCollectorFunc)(mRuleProcessors[eOverrideSheet], aData); nsRuleNode* lastOvrRN = mRuleWalker->GetCurrentNode(); mRuleWalker->SetLevel(eDocSheet, PR_TRUE); AddImportantRules(lastDocRN, lastHTMLPresHintRN); // doc mRuleWalker->SetLevel(eOverrideSheet, PR_TRUE); AddImportantRules(lastOvrRN, lastDocRN); // override #ifdef DEBUG AssertNoCSSRules(lastHTMLPresHintRN, lastUserRN); AssertNoImportantRules(lastHTMLPresHintRN, lastUserRN); // HTML preshints #endif mRuleWalker->SetLevel(eUserSheet, PR_TRUE); AddImportantRules(lastUserRN, lastPresHintRN); //user #ifdef DEBUG AssertNoCSSRules(lastPresHintRN, lastAgentRN); AssertNoImportantRules(lastPresHintRN, lastAgentRN); // preshints #endif mRuleWalker->SetLevel(eAgentSheet, PR_TRUE); AddImportantRules(lastAgentRN, nsnull); //agent } // Enumerate all the rules in a way that doesn't care about the order // of the rules and doesn't walk !important-rules. void nsStyleSet::WalkRuleProcessors(nsIStyleRuleProcessor::EnumFunc aFunc, RuleProcessorData* aData) { NS_PRECONDITION(SheetCount(ePresHintSheet) == 0 || SheetCount(eHTMLPresHintSheet) == 0, "Can't have both types of preshint sheets at once!"); if (mRuleProcessors[eAgentSheet]) (*aFunc)(mRuleProcessors[eAgentSheet], aData); if (mRuleProcessors[ePresHintSheet]) (*aFunc)(mRuleProcessors[ePresHintSheet], aData); PRBool skipUserStyles = aData->mContent && aData->mContent->IsInNativeAnonymousSubtree(); if (!skipUserStyles && mRuleProcessors[eUserSheet]) // NOTE: different (*aFunc)(mRuleProcessors[eUserSheet], aData); if (mRuleProcessors[eHTMLPresHintSheet]) (*aFunc)(mRuleProcessors[eHTMLPresHintSheet], aData); PRBool cutOffInheritance = PR_FALSE; if (mBindingManager) { // We can supply additional document-level sheets that should be walked. mBindingManager->WalkRules(aFunc, aData, &cutOffInheritance); } if (!skipUserStyles && !cutOffInheritance && mRuleProcessors[eDocSheet]) // NOTE: different (*aFunc)(mRuleProcessors[eDocSheet], aData); if (mRuleProcessors[eStyleAttrSheet]) (*aFunc)(mRuleProcessors[eStyleAttrSheet], aData); if (mRuleProcessors[eOverrideSheet]) (*aFunc)(mRuleProcessors[eOverrideSheet], aData); } PRBool nsStyleSet::BuildDefaultStyleData(nsPresContext* aPresContext) { NS_ASSERTION(!mDefaultStyleData.mResetData && !mDefaultStyleData.mInheritedData, "leaking default style data"); mDefaultStyleData.mResetData = new (aPresContext) nsResetStyleData; if (!mDefaultStyleData.mResetData) return PR_FALSE; mDefaultStyleData.mInheritedData = new (aPresContext) nsInheritedStyleData; if (!mDefaultStyleData.mInheritedData) return PR_FALSE; #define SSARG_PRESCONTEXT aPresContext #define CREATE_DATA(name, type, args) \ if (!(mDefaultStyleData.m##type##Data->m##name##Data = \ new (aPresContext) nsStyle##name args)) \ return PR_FALSE; #define STYLE_STRUCT_INHERITED(name, checkdata_cb, ctor_args) \ CREATE_DATA(name, Inherited, ctor_args) #define STYLE_STRUCT_RESET(name, checkdata_cb, ctor_args) \ CREATE_DATA(name, Reset, ctor_args) #include "nsStyleStructList.h" #undef STYLE_STRUCT_INHERITED #undef STYLE_STRUCT_RESET #undef SSARG_PRESCONTEXT return PR_TRUE; } already_AddRefed nsStyleSet::ResolveStyleFor(nsIContent* aContent, nsStyleContext* aParentContext) { NS_ENSURE_FALSE(mInShutdown, nsnull); nsStyleContext* result = nsnull; nsPresContext* presContext = PresContext(); NS_ASSERTION(aContent, "must have content"); NS_ASSERTION(aContent->IsNodeOfType(nsINode::eELEMENT), "content must be element"); if (aContent && presContext) { ElementRuleProcessorData data(presContext, aContent, mRuleWalker); FileRules(EnumRulesMatching, &data); result = GetContext(presContext, aParentContext, nsnull).get(); // Now reset the walker back to the root of the tree. mRuleWalker->Reset(); } return result; } already_AddRefed nsStyleSet::ResolveStyleForRules(nsStyleContext* aParentContext, const nsCOMArray &rules) { NS_ENSURE_FALSE(mInShutdown, nsnull); nsStyleContext* result = nsnull; nsPresContext *presContext = PresContext(); if (presContext) { mRuleWalker->SetLevel(eDocSheet, PR_FALSE); for (PRInt32 i = 0; i < rules.Count(); i++) { mRuleWalker->Forward(rules.ObjectAt(i)); } result = GetContext(presContext, aParentContext, nsnull).get(); // Now reset the walker back to the root of the tree. mRuleWalker->Reset(); } return result; } already_AddRefed nsStyleSet::ResolveStyleForNonElement(nsStyleContext* aParentContext) { nsStyleContext* result = nsnull; nsPresContext *presContext = PresContext(); if (presContext) { result = GetContext(presContext, aParentContext, nsCSSAnonBoxes::mozNonElement).get(); NS_ASSERTION(mRuleWalker->AtRoot(), "rule walker must be at root"); } return result; } void nsStyleSet::WalkRestrictionRule(nsIAtom* aPseudoType) { // This needs to match GetPseudoRestriction in nsRuleNode.cpp. if (aPseudoType) { if (aPseudoType == nsCSSPseudoElements::firstLetter) mRuleWalker->Forward(mFirstLetterRule); else if (aPseudoType == nsCSSPseudoElements::firstLine) mRuleWalker->Forward(mFirstLineRule); } } static PRBool EnumPseudoRulesMatching(nsIStyleRuleProcessor* aProcessor, void* aData) { PseudoRuleProcessorData* data = static_cast(aData); aProcessor->RulesMatching(data); return PR_TRUE; } already_AddRefed nsStyleSet::ResolvePseudoStyleFor(nsIContent* aParentContent, nsIAtom* aPseudoTag, nsStyleContext* aParentContext, nsICSSPseudoComparator* aComparator) { NS_ENSURE_FALSE(mInShutdown, nsnull); nsStyleContext* result = nsnull; nsPresContext *presContext = PresContext(); NS_ASSERTION(aPseudoTag, "must have pseudo tag"); NS_ASSERTION(!aParentContent || aParentContent->IsNodeOfType(nsINode::eELEMENT), "content (if non-null) must be element"); NS_ASSERTION(aParentContent || nsCSSAnonBoxes::IsAnonBox(aPseudoTag), "null content must correspond to anonymous box"); NS_ASSERTION(nsCSSAnonBoxes::IsAnonBox(aPseudoTag) || nsCSSPseudoElements::IsPseudoElement(aPseudoTag), "aPseudoTag must be pseudo-element or anonymous box"); if (aPseudoTag && presContext) { PseudoRuleProcessorData data(presContext, aParentContent, aPseudoTag, aComparator, mRuleWalker); WalkRestrictionRule(aPseudoTag); FileRules(EnumPseudoRulesMatching, &data); result = GetContext(presContext, aParentContext, aPseudoTag).get(); // Now reset the walker back to the root of the tree. mRuleWalker->Reset(); } return result; } already_AddRefed nsStyleSet::ProbePseudoStyleFor(nsIContent* aParentContent, nsIAtom* aPseudoTag, nsStyleContext* aParentContext) { NS_ENSURE_FALSE(mInShutdown, nsnull); nsStyleContext* result = nsnull; nsPresContext *presContext = PresContext(); NS_ASSERTION(aPseudoTag, "must have pseudo tag"); NS_ASSERTION(aParentContent && aParentContent->IsNodeOfType(nsINode::eELEMENT), "aParentContent must be element"); //NS_ASSERTION(nsCSSPseudoElements::IsPseudoElement(aPseudoTag), // "aPseudoTag must be a pseudo-element"); NS_ASSERTION(aParentContent || nsCSSAnonBoxes::IsAnonBox(aPseudoTag), "null content must correspond to anonymous box"); NS_ASSERTION(nsCSSAnonBoxes::IsAnonBox(aPseudoTag) || nsCSSPseudoElements::IsPseudoElement(aPseudoTag), "aPseudoTag must be pseudo-element or anonymous box"); if (aPseudoTag && presContext) { PseudoRuleProcessorData data(presContext, aParentContent, aPseudoTag, nsnull, mRuleWalker); WalkRestrictionRule(aPseudoTag); // not the root if there was a restriction rule nsRuleNode *adjustedRoot = mRuleWalker->GetCurrentNode(); FileRules(EnumPseudoRulesMatching, &data); if (mRuleWalker->GetCurrentNode() != adjustedRoot) result = GetContext(presContext, aParentContext, aPseudoTag).get(); // Now reset the walker back to the root of the tree. mRuleWalker->Reset(); } // For :before and :after pseudo-elements, having display: none or no // 'content' property is equivalent to not having the pseudo-element // at all. if (result && (aPseudoTag == nsCSSPseudoElements::before || aPseudoTag == nsCSSPseudoElements::after)) { const nsStyleDisplay *display = result->GetStyleDisplay(); const nsStyleContent *content = result->GetStyleContent(); // XXXldb What is contentCount for |content: ""|? if (display->mDisplay == NS_STYLE_DISPLAY_NONE || content->ContentCount() == 0) { result->Release(); result = nsnull; } } return result; } PRBool nsStyleSet::AppendFontFaceRules(nsPresContext* aPresContext, nsTArray& aArray) { NS_ENSURE_FALSE(mInShutdown, PR_FALSE); for (PRUint32 i = 0; i < NS_ARRAY_LENGTH(gCSSSheetTypes); ++i) { nsCSSRuleProcessor *ruleProc = static_cast (mRuleProcessors[gCSSSheetTypes[i]].get()); if (ruleProc && !ruleProc->AppendFontFaceRules(aPresContext, aArray)) return PR_FALSE; } return PR_TRUE; } void nsStyleSet::BeginShutdown(nsPresContext* aPresContext) { mInShutdown = 1; mRoots.Clear(); // no longer valid, since we won't keep it up to date } void nsStyleSet::Shutdown(nsPresContext* aPresContext) { delete mRuleWalker; mRuleWalker = nsnull; mRuleTree->Destroy(); mRuleTree = nsnull; // We can have old rule trees either because: // (1) we failed the assertions in EndReconstruct, or // (2) we're shutting down within a reconstruct (see bug 462392) for (PRUint32 i = mOldRuleTrees.Length(); i > 0; ) { --i; mOldRuleTrees[i]->Destroy(); } mOldRuleTrees.Clear(); mDefaultStyleData.Destroy(0, aPresContext); } static const PRInt32 kGCInterval = 1000; void nsStyleSet::NotifyStyleContextDestroyed(nsPresContext* aPresContext, nsStyleContext* aStyleContext) { if (mInShutdown) return; NS_ASSERTION(mRuleWalker->AtRoot(), "Rule walker should be at root"); // Remove style contexts from mRoots even if mOldRuleTree is non-null. This // could be a style context from the new ruletree! if (!aStyleContext->GetParent()) { mRoots.RemoveElement(aStyleContext); } if (mInReconstruct) return; if (++mDestroyedCount == kGCInterval) { GCRuleTrees(); } } void nsStyleSet::GCRuleTrees() { mDestroyedCount = 0; // Mark the style context tree by marking all style contexts which // have no parent, which will mark all descendants. This will reach // style contexts in the undisplayed map and "additional style // contexts" since they are descendants of the roots. for (PRInt32 i = mRoots.Length() - 1; i >= 0; --i) { mRoots[i]->Mark(); } // Sweep the rule tree. #ifdef DEBUG PRBool deleted = #endif mRuleTree->Sweep(); NS_ASSERTION(!deleted, "Root node must not be gc'd"); // Sweep the old rule trees. for (PRUint32 i = mOldRuleTrees.Length(); i > 0; ) { --i; if (mOldRuleTrees[i]->Sweep()) { // It was deleted, as it should be. mOldRuleTrees.RemoveElementAt(i); } else { NS_NOTREACHED("old rule tree still referenced"); } } } already_AddRefed nsStyleSet::ReParentStyleContext(nsPresContext* aPresContext, nsStyleContext* aStyleContext, nsStyleContext* aNewParentContext) { NS_ASSERTION(aPresContext, "must have pres context"); NS_ASSERTION(aStyleContext, "must have style context"); if (aPresContext && aStyleContext) { if (aStyleContext->GetParent() == aNewParentContext) { aStyleContext->AddRef(); return aStyleContext; } else { // really a new parent nsIAtom* pseudoTag = aStyleContext->GetPseudoType(); nsRuleNode* ruleNode = aStyleContext->GetRuleNode(); mRuleWalker->SetCurrentNode(ruleNode); already_AddRefed result = GetContext(aPresContext, aNewParentContext, pseudoTag); mRuleWalker->Reset(); return result; } } return nsnull; } struct StatefulData : public StateRuleProcessorData { StatefulData(nsPresContext* aPresContext, nsIContent* aContent, PRInt32 aStateMask) : StateRuleProcessorData(aPresContext, aContent, aStateMask), mHint(nsReStyleHint(0)) {} nsReStyleHint mHint; }; static PRBool SheetHasStatefulStyle(nsIStyleRuleProcessor* aProcessor, void *aData) { StatefulData* data = (StatefulData*)aData; nsReStyleHint hint; aProcessor->HasStateDependentStyle(data, &hint); data->mHint = nsReStyleHint(data->mHint | hint); return PR_TRUE; // continue } // Test if style is dependent on content state nsReStyleHint nsStyleSet::HasStateDependentStyle(nsPresContext* aPresContext, nsIContent* aContent, PRInt32 aStateMask) { nsReStyleHint result = nsReStyleHint(0); if (aContent->IsNodeOfType(nsINode::eELEMENT)) { StatefulData data(aPresContext, aContent, aStateMask); WalkRuleProcessors(SheetHasStatefulStyle, &data); result = data.mHint; } return result; } struct AttributeData : public AttributeRuleProcessorData { AttributeData(nsPresContext* aPresContext, nsIContent* aContent, nsIAtom* aAttribute, PRInt32 aModType, PRUint32 aStateMask) : AttributeRuleProcessorData(aPresContext, aContent, aAttribute, aModType, aStateMask), mHint(nsReStyleHint(0)) {} nsReStyleHint mHint; }; static PRBool SheetHasAttributeStyle(nsIStyleRuleProcessor* aProcessor, void *aData) { AttributeData* data = (AttributeData*)aData; nsReStyleHint hint; aProcessor->HasAttributeDependentStyle(data, &hint); data->mHint = nsReStyleHint(data->mHint | hint); return PR_TRUE; // continue } // Test if style is dependent on content state nsReStyleHint nsStyleSet::HasAttributeDependentStyle(nsPresContext* aPresContext, nsIContent* aContent, nsIAtom* aAttribute, PRInt32 aModType, PRUint32 aStateMask) { nsReStyleHint result = nsReStyleHint(0); if (aContent->IsNodeOfType(nsINode::eELEMENT)) { AttributeData data(aPresContext, aContent, aAttribute, aModType, aStateMask); WalkRuleProcessors(SheetHasAttributeStyle, &data); result = data.mHint; } return result; } PRBool nsStyleSet::MediumFeaturesChanged(nsPresContext* aPresContext) { // We can't use WalkRuleProcessors without a content node. PRBool stylesChanged = PR_FALSE; for (PRUint32 i = 0; i < NS_ARRAY_LENGTH(mRuleProcessors); ++i) { nsIStyleRuleProcessor *processor = mRuleProcessors[i]; if (!processor) { continue; } PRBool thisChanged = PR_FALSE; processor->MediumFeaturesChanged(aPresContext, &thisChanged); stylesChanged = stylesChanged || thisChanged; } if (mBindingManager) { PRBool thisChanged = PR_FALSE; mBindingManager->MediumFeaturesChanged(aPresContext, &thisChanged); stylesChanged = stylesChanged || thisChanged; } return stylesChanged; }