forked from mirrors/gecko-dev
290 lines
10 KiB
C++
290 lines
10 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* representation of CSSRuleList for stylo */
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#include "mozilla/ServoCSSRuleList.h"
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#include "mozilla/dom/CSSCounterStyleRule.h"
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#include "mozilla/dom/CSSFontFaceRule.h"
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#include "mozilla/dom/CSSFontFeatureValuesRule.h"
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#include "mozilla/dom/CSSFontPaletteValuesRule.h"
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#include "mozilla/dom/CSSImportRule.h"
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#include "mozilla/dom/CSSLayerBlockRule.h"
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#include "mozilla/dom/CSSLayerStatementRule.h"
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#include "mozilla/dom/CSSKeyframesRule.h"
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#include "mozilla/dom/CSSContainerRule.h"
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#include "mozilla/dom/CSSMediaRule.h"
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#include "mozilla/dom/CSSMozDocumentRule.h"
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#include "mozilla/dom/CSSNamespaceRule.h"
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#include "mozilla/dom/CSSPageRule.h"
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#include "mozilla/dom/CSSStyleRule.h"
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#include "mozilla/dom/CSSSupportsRule.h"
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#include "mozilla/IntegerRange.h"
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#include "mozilla/ServoBindings.h"
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#include "mozilla/StyleSheet.h"
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#include "mozilla/dom/Document.h"
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using namespace mozilla::dom;
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namespace mozilla {
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ServoCSSRuleList::ServoCSSRuleList(already_AddRefed<ServoCssRules> aRawRules,
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StyleSheet* aSheet,
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css::GroupRule* aParentRule)
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: mStyleSheet(aSheet), mParentRule(aParentRule), mRawRules(aRawRules) {
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ResetRules();
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}
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// QueryInterface implementation for ServoCSSRuleList
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ServoCSSRuleList)
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NS_INTERFACE_MAP_END_INHERITING(dom::CSSRuleList)
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NS_IMPL_ADDREF_INHERITED(ServoCSSRuleList, dom::CSSRuleList)
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NS_IMPL_RELEASE_INHERITED(ServoCSSRuleList, dom::CSSRuleList)
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NS_IMPL_CYCLE_COLLECTION_CLASS(ServoCSSRuleList)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(ServoCSSRuleList)
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tmp->DropAllRules();
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NS_IMPL_CYCLE_COLLECTION_UNLINK_END_INHERITED(dom::CSSRuleList)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(ServoCSSRuleList,
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dom::CSSRuleList)
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tmp->EnumerateInstantiatedRules([&](css::Rule* aRule, uint32_t) {
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if (!aRule->IsCCLeaf()) {
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NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mRules[i]");
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cb.NoteXPCOMChild(aRule);
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}
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});
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
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css::Rule* ServoCSSRuleList::GetRule(uint32_t aIndex) {
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uintptr_t rule = mRules[aIndex];
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if (rule <= kMaxRuleType) {
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RefPtr<css::Rule> ruleObj = nullptr;
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switch (StyleCssRuleType(rule)) {
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#define CASE_RULE(const_, name_) \
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case StyleCssRuleType::const_: { \
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uint32_t line = 0, column = 0; \
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RefPtr<RawServo##name_##Rule> raw = \
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Servo_CssRules_Get##name_##RuleAt(mRawRules, aIndex, &line, &column) \
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.Consume(); \
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MOZ_ASSERT(raw); \
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ruleObj = new CSS##name_##Rule(raw.forget(), mStyleSheet, mParentRule, \
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line, column); \
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MOZ_ASSERT(ruleObj->Type() == StyleCssRuleType(rule)); \
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break; \
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}
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CASE_RULE(Style, Style)
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CASE_RULE(Keyframes, Keyframes)
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CASE_RULE(Media, Media)
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CASE_RULE(Namespace, Namespace)
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CASE_RULE(Page, Page)
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CASE_RULE(Supports, Supports)
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CASE_RULE(Document, MozDocument)
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CASE_RULE(Import, Import)
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CASE_RULE(FontFeatureValues, FontFeatureValues)
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CASE_RULE(FontPaletteValues, FontPaletteValues)
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CASE_RULE(FontFace, FontFace)
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CASE_RULE(CounterStyle, CounterStyle)
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CASE_RULE(LayerBlock, LayerBlock)
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CASE_RULE(LayerStatement, LayerStatement)
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CASE_RULE(Container, Container)
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#undef CASE_RULE
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case StyleCssRuleType::Viewport:
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MOZ_ASSERT_UNREACHABLE("viewport is not implemented in Gecko");
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return nullptr;
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case StyleCssRuleType::Keyframe:
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MOZ_ASSERT_UNREACHABLE("keyframe rule cannot be here");
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return nullptr;
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}
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rule = CastToUint(ruleObj.forget().take());
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mRules[aIndex] = rule;
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}
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return CastToPtr(rule);
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}
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css::Rule* ServoCSSRuleList::IndexedGetter(uint32_t aIndex, bool& aFound) {
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if (aIndex >= mRules.Length()) {
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aFound = false;
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return nullptr;
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}
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aFound = true;
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return GetRule(aIndex);
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}
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template <typename Func>
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void ServoCSSRuleList::EnumerateInstantiatedRules(Func aCallback) {
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uint32_t index = 0;
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for (uintptr_t rule : mRules) {
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if (rule > kMaxRuleType) {
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aCallback(CastToPtr(rule), index);
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}
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index++;
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}
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}
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static void DropRule(already_AddRefed<css::Rule> aRule) {
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RefPtr<css::Rule> rule = aRule;
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rule->DropReferences();
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}
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void ServoCSSRuleList::ResetRules() {
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// DropRule could reenter here via the cycle collector.
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auto rules = std::move(mRules);
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for (uintptr_t rule : rules) {
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if (rule > kMaxRuleType) {
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DropRule(already_AddRefed<css::Rule>(CastToPtr(rule)));
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}
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}
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MOZ_ASSERT(mRules.IsEmpty());
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if (mRawRules) {
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Servo_CssRules_ListTypes(mRawRules, &mRules);
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}
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}
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void ServoCSSRuleList::DropAllRules() {
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mStyleSheet = nullptr;
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mParentRule = nullptr;
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mRawRules = nullptr;
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ResetRules();
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}
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void ServoCSSRuleList::DropSheetReference() {
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// If mStyleSheet is not set on this rule list, then it is not set on any of
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// its instantiated rules either. To avoid O(N^2) beavhior in the depth of
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// group rule nesting, which can happen if we are unlinked starting from the
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// deepest nested group rule, skip recursing into the rule list if we know we
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// don't need to.
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if (!mStyleSheet) {
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return;
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}
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mStyleSheet = nullptr;
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EnumerateInstantiatedRules(
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[](css::Rule* rule, uint32_t) { rule->DropSheetReference(); });
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}
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void ServoCSSRuleList::DropParentRuleReference() {
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mParentRule = nullptr;
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EnumerateInstantiatedRules(
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[](css::Rule* rule, uint32_t) { rule->DropParentRuleReference(); });
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}
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nsresult ServoCSSRuleList::InsertRule(const nsACString& aRule,
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uint32_t aIndex) {
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MOZ_ASSERT(mStyleSheet,
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"Caller must ensure that "
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"the list is not unlinked from stylesheet");
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if (!mRawRules || IsReadOnly()) {
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return NS_OK;
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}
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mStyleSheet->WillDirty();
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bool nested = !!mParentRule;
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css::Loader* loader = nullptr;
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auto allowImportRules = mStyleSheet->SelfOrAncestorIsConstructed()
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? StyleAllowImportRules::No
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: StyleAllowImportRules::Yes;
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// TODO(emilio, bug 1535456): Should probably always be able to get a handle
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// to some loader if we're parsing an @import rule, but which one?
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//
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// StyleSheet::ReparseSheet just mints a new loader, but that'd be wrong in
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// this case I think, since such a load will bypass CSP checks.
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if (Document* doc = mStyleSheet->GetAssociatedDocument()) {
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loader = doc->CSSLoader();
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}
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StyleCssRuleType type;
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nsresult rv = Servo_CssRules_InsertRule(mRawRules, mStyleSheet->RawContents(),
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&aRule, aIndex, nested, loader,
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allowImportRules, mStyleSheet, &type);
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if (NS_FAILED(rv)) {
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return rv;
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}
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mRules.InsertElementAt(aIndex, uintptr_t(type));
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return rv;
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}
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nsresult ServoCSSRuleList::DeleteRule(uint32_t aIndex) {
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if (!mRawRules || IsReadOnly()) {
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return NS_OK;
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}
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nsresult rv = Servo_CssRules_DeleteRule(mRawRules, aIndex);
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if (!NS_FAILED(rv)) {
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uintptr_t rule = mRules[aIndex];
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mRules.RemoveElementAt(aIndex);
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if (rule > kMaxRuleType) {
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DropRule(already_AddRefed<css::Rule>(CastToPtr(rule)));
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}
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}
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return rv;
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}
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void ServoCSSRuleList::SetRawContents(RefPtr<ServoCssRules> aNewRules,
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bool aFromClone) {
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mRawRules = std::move(aNewRules);
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if (!aFromClone) {
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ResetRules();
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return;
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}
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EnumerateInstantiatedRules([&](css::Rule* aRule, uint32_t aIndex) {
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#define CASE_FOR(constant_, type_) \
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case StyleCssRuleType::constant_: { \
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uint32_t line = 0, column = 0; \
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RefPtr<RawServo##type_##Rule> raw = \
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Servo_CssRules_Get##type_##RuleAt(mRawRules, aIndex, &line, &column) \
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.Consume(); \
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static_cast<dom::CSS##type_##Rule*>(aRule)->SetRawAfterClone( \
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std::move(raw)); \
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break; \
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}
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switch (aRule->Type()) {
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CASE_FOR(Style, Style)
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CASE_FOR(Keyframes, Keyframes)
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CASE_FOR(Media, Media)
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CASE_FOR(Namespace, Namespace)
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CASE_FOR(Page, Page)
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CASE_FOR(Supports, Supports)
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CASE_FOR(Document, MozDocument)
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CASE_FOR(Import, Import)
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CASE_FOR(FontFeatureValues, FontFeatureValues)
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CASE_FOR(FontPaletteValues, FontPaletteValues)
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CASE_FOR(FontFace, FontFace)
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CASE_FOR(CounterStyle, CounterStyle)
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CASE_FOR(LayerBlock, LayerBlock)
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CASE_FOR(LayerStatement, LayerStatement)
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CASE_FOR(Container, Container)
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case StyleCssRuleType::Keyframe:
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MOZ_ASSERT_UNREACHABLE("keyframe rule cannot be here");
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break;
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case StyleCssRuleType::Viewport:
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MOZ_ASSERT_UNREACHABLE("Gecko doesn't implemente @viewport?");
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break;
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}
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#undef CASE_FOR
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});
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}
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ServoCSSRuleList::~ServoCSSRuleList() {
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MOZ_ASSERT(!mStyleSheet, "Backpointer should have been cleared");
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MOZ_ASSERT(!mParentRule, "Backpointer should have been cleared");
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DropAllRules();
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}
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bool ServoCSSRuleList::IsReadOnly() const {
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MOZ_ASSERT(!mStyleSheet || !mParentRule ||
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mStyleSheet->IsReadOnly() == mParentRule->IsReadOnly(),
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"a parent rule should be read only iff the owning sheet is "
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"read only");
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return mStyleSheet && mStyleSheet->IsReadOnly();
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}
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} // namespace mozilla
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