| // Copyright 2014 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "core/css/parser/CSSParserImpl.h" |
| |
| #include "core/css/CSSCustomIdentValue.h" |
| #include "core/css/CSSCustomPropertyDeclaration.h" |
| #include "core/css/CSSKeyframesRule.h" |
| #include "core/css/CSSStyleSheet.h" |
| #include "core/css/StylePropertySet.h" |
| #include "core/css/StyleRuleImport.h" |
| #include "core/css/StyleRuleKeyframe.h" |
| #include "core/css/StyleRuleNamespace.h" |
| #include "core/css/StyleSheetContents.h" |
| #include "core/css/parser/CSSAtRuleID.h" |
| #include "core/css/parser/CSSParserObserver.h" |
| #include "core/css/parser/CSSParserObserverWrapper.h" |
| #include "core/css/parser/CSSParserSelector.h" |
| #include "core/css/parser/CSSPropertyParser.h" |
| #include "core/css/parser/CSSSelectorParser.h" |
| #include "core/css/parser/CSSSupportsParser.h" |
| #include "core/css/parser/CSSTokenizer.h" |
| #include "core/css/parser/CSSVariableParser.h" |
| #include "core/css/parser/MediaQueryParser.h" |
| #include "core/dom/Document.h" |
| #include "core/dom/Element.h" |
| #include "core/frame/Deprecation.h" |
| #include "core/frame/UseCounter.h" |
| #include "platform/TraceEvent.h" |
| #include "wtf/PtrUtil.h" |
| #include <bitset> |
| #include <memory> |
| |
| namespace blink { |
| |
| CSSParserImpl::CSSParserImpl(const CSSParserContext& context, StyleSheetContents* styleSheet) |
| : m_context(context) |
| , m_styleSheet(styleSheet) |
| , m_observerWrapper(nullptr) |
| { |
| } |
| |
| bool CSSParserImpl::parseValue(MutableStylePropertySet* declaration, CSSPropertyID unresolvedProperty, const String& string, bool important, const CSSParserContext& context) |
| { |
| CSSParserImpl parser(context); |
| StyleRule::RuleType ruleType = StyleRule::Style; |
| if (declaration->cssParserMode() == CSSViewportRuleMode) |
| ruleType = StyleRule::Viewport; |
| CSSTokenizer::Scope scope(string); |
| parser.consumeDeclarationValue(scope.tokenRange(), unresolvedProperty, important, ruleType); |
| if (parser.m_parsedProperties.isEmpty()) |
| return false; |
| return declaration->addParsedProperties(parser.m_parsedProperties); |
| } |
| |
| bool CSSParserImpl::parseVariableValue(MutableStylePropertySet* declaration, const AtomicString& propertyName, const String& value, bool important, const CSSParserContext& context) |
| { |
| CSSParserImpl parser(context); |
| CSSTokenizer::Scope scope(value); |
| parser.consumeVariableValue(scope.tokenRange(), propertyName, important); |
| if (parser.m_parsedProperties.isEmpty()) |
| return false; |
| return declaration->addParsedProperties(parser.m_parsedProperties); |
| } |
| |
| static inline void filterProperties(bool important, const HeapVector<CSSProperty, 256>& input, HeapVector<CSSProperty, 256>& output, size_t& unusedEntries, std::bitset<numCSSProperties>& seenProperties, HashSet<AtomicString>& seenCustomProperties) |
| { |
| // Add properties in reverse order so that highest priority definitions are reached first. Duplicate definitions can then be ignored when found. |
| for (size_t i = input.size(); i--; ) { |
| const CSSProperty& property = input[i]; |
| if (property.isImportant() != important) |
| continue; |
| const unsigned propertyIDIndex = property.id() - firstCSSProperty; |
| |
| if (property.id() == CSSPropertyVariable) { |
| const AtomicString& name = toCSSCustomPropertyDeclaration(property.value())->name(); |
| if (seenCustomProperties.contains(name)) |
| continue; |
| seenCustomProperties.add(name); |
| } else if (property.id() == CSSPropertyApplyAtRule) { |
| // TODO(timloh): Do we need to do anything here? |
| } else { |
| if (seenProperties.test(propertyIDIndex)) |
| continue; |
| seenProperties.set(propertyIDIndex); |
| } |
| output[--unusedEntries] = property; |
| } |
| } |
| |
| static ImmutableStylePropertySet* createStylePropertySet(HeapVector<CSSProperty, 256>& parsedProperties, CSSParserMode mode) |
| { |
| std::bitset<numCSSProperties> seenProperties; |
| size_t unusedEntries = parsedProperties.size(); |
| HeapVector<CSSProperty, 256> results(unusedEntries); |
| HashSet<AtomicString> seenCustomProperties; |
| |
| filterProperties(true, parsedProperties, results, unusedEntries, seenProperties, seenCustomProperties); |
| filterProperties(false, parsedProperties, results, unusedEntries, seenProperties, seenCustomProperties); |
| |
| ImmutableStylePropertySet* result = ImmutableStylePropertySet::create(results.data() + unusedEntries, results.size() - unusedEntries, mode); |
| parsedProperties.clear(); |
| return result; |
| } |
| |
| ImmutableStylePropertySet* CSSParserImpl::parseInlineStyleDeclaration(const String& string, Element* element) |
| { |
| Document& document = element->document(); |
| CSSParserContext context = CSSParserContext(document.elementSheet().contents()->parserContext(), UseCounter::getFrom(&document)); |
| CSSParserMode mode = element->isHTMLElement() && !document.inQuirksMode() ? HTMLStandardMode : HTMLQuirksMode; |
| context.setMode(mode); |
| CSSParserImpl parser(context, document.elementSheet().contents()); |
| CSSTokenizer::Scope scope(string); |
| parser.consumeDeclarationList(scope.tokenRange(), StyleRule::Style); |
| return createStylePropertySet(parser.m_parsedProperties, mode); |
| } |
| |
| bool CSSParserImpl::parseDeclarationList(MutableStylePropertySet* declaration, const String& string, const CSSParserContext& context) |
| { |
| CSSParserImpl parser(context); |
| StyleRule::RuleType ruleType = StyleRule::Style; |
| if (declaration->cssParserMode() == CSSViewportRuleMode) |
| ruleType = StyleRule::Viewport; |
| CSSTokenizer::Scope scope(string); |
| parser.consumeDeclarationList(scope.tokenRange(), ruleType); |
| if (parser.m_parsedProperties.isEmpty()) |
| return false; |
| |
| std::bitset<numCSSProperties> seenProperties; |
| size_t unusedEntries = parser.m_parsedProperties.size(); |
| HeapVector<CSSProperty, 256> results(unusedEntries); |
| HashSet<AtomicString> seenCustomProperties; |
| filterProperties(true, parser.m_parsedProperties, results, unusedEntries, seenProperties, seenCustomProperties); |
| filterProperties(false, parser.m_parsedProperties, results, unusedEntries, seenProperties, seenCustomProperties); |
| if (unusedEntries) |
| results.remove(0, unusedEntries); |
| return declaration->addParsedProperties(results); |
| } |
| |
| StyleRuleBase* CSSParserImpl::parseRule(const String& string, const CSSParserContext& context, StyleSheetContents* styleSheet, AllowedRulesType allowedRules) |
| { |
| CSSParserImpl parser(context, styleSheet); |
| CSSTokenizer::Scope scope(string); |
| CSSParserTokenRange range = scope.tokenRange(); |
| range.consumeWhitespace(); |
| if (range.atEnd()) |
| return nullptr; // Parse error, empty rule |
| StyleRuleBase* rule; |
| if (range.peek().type() == AtKeywordToken) |
| rule = parser.consumeAtRule(range, allowedRules); |
| else |
| rule = parser.consumeQualifiedRule(range, allowedRules); |
| if (!rule) |
| return nullptr; // Parse error, failed to consume rule |
| range.consumeWhitespace(); |
| if (!rule || !range.atEnd()) |
| return nullptr; // Parse error, trailing garbage |
| return rule; |
| } |
| |
| void CSSParserImpl::parseStyleSheet(const String& string, const CSSParserContext& context, StyleSheetContents* styleSheet) |
| { |
| TRACE_EVENT_BEGIN2( |
| "blink,blink_style", "CSSParserImpl::parseStyleSheet", |
| "baseUrl", context.baseURL().getString().utf8(), |
| "mode", context.mode()); |
| |
| TRACE_EVENT_BEGIN0("blink,blink_style", "CSSParserImpl::parseStyleSheet.tokenize"); |
| CSSTokenizer::Scope scope(string); |
| TRACE_EVENT_END0("blink,blink_style", "CSSParserImpl::parseStyleSheet.tokenize"); |
| |
| TRACE_EVENT_BEGIN0("blink,blink_style", "CSSParserImpl::parseStyleSheet.parse"); |
| CSSParserImpl parser(context, styleSheet); |
| bool firstRuleValid = parser.consumeRuleList(scope.tokenRange(), TopLevelRuleList, [&styleSheet](StyleRuleBase* rule) { |
| if (rule->isCharsetRule()) |
| return; |
| styleSheet->parserAppendRule(rule); |
| }); |
| styleSheet->setHasSyntacticallyValidCSSHeader(firstRuleValid); |
| TRACE_EVENT_END0("blink,blink_style", "CSSParserImpl::parseStyleSheet.parse"); |
| |
| TRACE_EVENT_END2( |
| "blink,blink_style", "CSSParserImpl::parseStyleSheet", |
| "tokenCount", scope.tokenCount(), |
| "length", string.length()); |
| } |
| |
| CSSSelectorList CSSParserImpl::parsePageSelector(CSSParserTokenRange range, StyleSheetContents* styleSheet) |
| { |
| // We only support a small subset of the css-page spec. |
| range.consumeWhitespace(); |
| AtomicString typeSelector; |
| if (range.peek().type() == IdentToken) |
| typeSelector = range.consume().value().toAtomicString(); |
| |
| AtomicString pseudo; |
| if (range.peek().type() == ColonToken) { |
| range.consume(); |
| if (range.peek().type() != IdentToken) |
| return CSSSelectorList(); |
| pseudo = range.consume().value().toAtomicString(); |
| } |
| |
| range.consumeWhitespace(); |
| if (!range.atEnd()) |
| return CSSSelectorList(); // Parse error; extra tokens in @page selector |
| |
| std::unique_ptr<CSSParserSelector> selector; |
| if (!typeSelector.isNull() && pseudo.isNull()) { |
| selector = CSSParserSelector::create(QualifiedName(nullAtom, typeSelector, styleSheet->defaultNamespace())); |
| } else { |
| selector = CSSParserSelector::create(); |
| if (!pseudo.isNull()) { |
| selector->setMatch(CSSSelector::PagePseudoClass); |
| selector->updatePseudoType(pseudo.lower()); |
| if (selector->pseudoType() == CSSSelector::PseudoUnknown) |
| return CSSSelectorList(); |
| } |
| if (!typeSelector.isNull()) { |
| selector->prependTagSelector(QualifiedName(nullAtom, typeSelector, styleSheet->defaultNamespace())); |
| } |
| } |
| |
| selector->setForPage(); |
| Vector<std::unique_ptr<CSSParserSelector>> selectorVector; |
| selectorVector.append(std::move(selector)); |
| CSSSelectorList selectorList = CSSSelectorList::adoptSelectorVector(selectorVector); |
| return selectorList; |
| } |
| |
| ImmutableStylePropertySet* CSSParserImpl::parseCustomPropertySet(CSSParserTokenRange range) |
| { |
| range.consumeWhitespace(); |
| if (range.peek().type() != LeftBraceToken) |
| return nullptr; |
| CSSParserTokenRange block = range.consumeBlock(); |
| range.consumeWhitespace(); |
| if (!range.atEnd()) |
| return nullptr; |
| CSSParserImpl parser(strictCSSParserContext()); |
| parser.consumeDeclarationList(block, StyleRule::Style); |
| |
| // Drop nested @apply rules. Seems nicer to do this here instead of making |
| // a different StyleRule type |
| for (size_t i = parser.m_parsedProperties.size(); i--; ) { |
| if (parser.m_parsedProperties[i].id() == CSSPropertyApplyAtRule) |
| parser.m_parsedProperties.remove(i); |
| } |
| |
| return createStylePropertySet(parser.m_parsedProperties, HTMLStandardMode); |
| } |
| |
| std::unique_ptr<Vector<double>> CSSParserImpl::parseKeyframeKeyList(const String& keyList) |
| { |
| return consumeKeyframeKeyList(CSSTokenizer::Scope(keyList).tokenRange()); |
| } |
| |
| bool CSSParserImpl::supportsDeclaration(CSSParserTokenRange& range) |
| { |
| ASSERT(m_parsedProperties.isEmpty()); |
| consumeDeclaration(range, StyleRule::Style); |
| bool result = !m_parsedProperties.isEmpty(); |
| m_parsedProperties.clear(); |
| return result; |
| } |
| |
| void CSSParserImpl::parseDeclarationListForInspector(const String& declaration, const CSSParserContext& context, CSSParserObserver& observer) |
| { |
| CSSParserImpl parser(context); |
| CSSParserObserverWrapper wrapper(observer); |
| parser.m_observerWrapper = &wrapper; |
| CSSTokenizer::Scope scope(declaration, wrapper); |
| observer.startRuleHeader(StyleRule::Style, 0); |
| observer.endRuleHeader(1); |
| parser.consumeDeclarationList(scope.tokenRange(), StyleRule::Style); |
| } |
| |
| void CSSParserImpl::parseStyleSheetForInspector(const String& string, const CSSParserContext& context, StyleSheetContents* styleSheet, CSSParserObserver& observer) |
| { |
| CSSParserImpl parser(context, styleSheet); |
| CSSParserObserverWrapper wrapper(observer); |
| parser.m_observerWrapper = &wrapper; |
| CSSTokenizer::Scope scope(string, wrapper); |
| bool firstRuleValid = parser.consumeRuleList(scope.tokenRange(), TopLevelRuleList, [&styleSheet](StyleRuleBase* rule) { |
| if (rule->isCharsetRule()) |
| return; |
| styleSheet->parserAppendRule(rule); |
| }); |
| styleSheet->setHasSyntacticallyValidCSSHeader(firstRuleValid); |
| } |
| |
| static CSSParserImpl::AllowedRulesType computeNewAllowedRules(CSSParserImpl::AllowedRulesType allowedRules, StyleRuleBase* rule) |
| { |
| if (!rule || allowedRules == CSSParserImpl::KeyframeRules || allowedRules == CSSParserImpl::NoRules) |
| return allowedRules; |
| ASSERT(allowedRules <= CSSParserImpl::RegularRules); |
| if (rule->isCharsetRule() || rule->isImportRule()) |
| return CSSParserImpl::AllowImportRules; |
| if (rule->isNamespaceRule()) |
| return CSSParserImpl::AllowNamespaceRules; |
| return CSSParserImpl::RegularRules; |
| } |
| |
| template<typename T> |
| bool CSSParserImpl::consumeRuleList(CSSParserTokenRange range, RuleListType ruleListType, const T callback) |
| { |
| AllowedRulesType allowedRules = RegularRules; |
| switch (ruleListType) { |
| case TopLevelRuleList: |
| allowedRules = AllowCharsetRules; |
| break; |
| case RegularRuleList: |
| allowedRules = RegularRules; |
| break; |
| case KeyframesRuleList: |
| allowedRules = KeyframeRules; |
| break; |
| default: |
| ASSERT_NOT_REACHED(); |
| } |
| |
| bool seenRule = false; |
| bool firstRuleValid = false; |
| while (!range.atEnd()) { |
| StyleRuleBase* rule; |
| switch (range.peek().type()) { |
| case WhitespaceToken: |
| range.consumeWhitespace(); |
| continue; |
| case AtKeywordToken: |
| rule = consumeAtRule(range, allowedRules); |
| break; |
| case CDOToken: |
| case CDCToken: |
| if (ruleListType == TopLevelRuleList) { |
| range.consume(); |
| continue; |
| } |
| // fallthrough |
| default: |
| rule = consumeQualifiedRule(range, allowedRules); |
| break; |
| } |
| if (!seenRule) { |
| seenRule = true; |
| firstRuleValid = rule; |
| } |
| if (rule) { |
| allowedRules = computeNewAllowedRules(allowedRules, rule); |
| callback(rule); |
| } |
| } |
| |
| return firstRuleValid; |
| } |
| |
| StyleRuleBase* CSSParserImpl::consumeAtRule(CSSParserTokenRange& range, AllowedRulesType allowedRules) |
| { |
| ASSERT(range.peek().type() == AtKeywordToken); |
| const StringView name = range.consume().value(); |
| const CSSParserToken* preludeStart = &range.peek(); |
| while (!range.atEnd() && range.peek().type() != LeftBraceToken && range.peek().type() != SemicolonToken) |
| range.consumeComponentValue(); |
| |
| CSSParserTokenRange prelude = range.makeSubRange(preludeStart, &range.peek()); |
| CSSAtRuleID id = cssAtRuleID(name); |
| if (id != CSSAtRuleInvalid && m_context.useCounter()) |
| countAtRule(m_context.useCounter(), id); |
| |
| if (range.atEnd() || range.peek().type() == SemicolonToken) { |
| range.consume(); |
| if (allowedRules == AllowCharsetRules && id == CSSAtRuleCharset) |
| return consumeCharsetRule(prelude); |
| if (allowedRules <= AllowImportRules && id == CSSAtRuleImport) |
| return consumeImportRule(prelude); |
| if (allowedRules <= AllowNamespaceRules && id == CSSAtRuleNamespace) |
| return consumeNamespaceRule(prelude); |
| if (allowedRules == ApplyRules && id == CSSAtRuleApply) { |
| consumeApplyRule(prelude); |
| return nullptr; // consumeApplyRule just updates m_parsedProperties |
| } |
| return nullptr; // Parse error, unrecognised at-rule without block |
| } |
| |
| CSSParserTokenRange block = range.consumeBlock(); |
| if (allowedRules == KeyframeRules) |
| return nullptr; // Parse error, no at-rules supported inside @keyframes |
| if (allowedRules == NoRules || allowedRules == ApplyRules) |
| return nullptr; // Parse error, no at-rules with blocks supported inside declaration lists |
| |
| ASSERT(allowedRules <= RegularRules); |
| |
| switch (id) { |
| case CSSAtRuleMedia: |
| return consumeMediaRule(prelude, block); |
| case CSSAtRuleSupports: |
| return consumeSupportsRule(prelude, block); |
| case CSSAtRuleViewport: |
| return consumeViewportRule(prelude, block); |
| case CSSAtRuleFontFace: |
| return consumeFontFaceRule(prelude, block); |
| case CSSAtRuleWebkitKeyframes: |
| return consumeKeyframesRule(true, prelude, block); |
| case CSSAtRuleKeyframes: |
| return consumeKeyframesRule(false, prelude, block); |
| case CSSAtRulePage: |
| return consumePageRule(prelude, block); |
| default: |
| return nullptr; // Parse error, unrecognised at-rule with block |
| } |
| } |
| |
| StyleRuleBase* CSSParserImpl::consumeQualifiedRule(CSSParserTokenRange& range, AllowedRulesType allowedRules) |
| { |
| const CSSParserToken* preludeStart = &range.peek(); |
| while (!range.atEnd() && range.peek().type() != LeftBraceToken) |
| range.consumeComponentValue(); |
| |
| if (range.atEnd()) |
| return nullptr; // Parse error, EOF instead of qualified rule block |
| |
| CSSParserTokenRange prelude = range.makeSubRange(preludeStart, &range.peek()); |
| CSSParserTokenRange block = range.consumeBlock(); |
| |
| if (allowedRules <= RegularRules) |
| return consumeStyleRule(prelude, block); |
| if (allowedRules == KeyframeRules) |
| return consumeKeyframeStyleRule(prelude, block); |
| |
| ASSERT_NOT_REACHED(); |
| return nullptr; |
| } |
| |
| // This may still consume tokens if it fails |
| static AtomicString consumeStringOrURI(CSSParserTokenRange& range) |
| { |
| const CSSParserToken& token = range.peek(); |
| |
| if (token.type() == StringToken || token.type() == UrlToken) |
| return range.consumeIncludingWhitespace().value().toAtomicString(); |
| |
| if (token.type() != FunctionToken || !equalIgnoringASCIICase(token.value(), "url")) |
| return AtomicString(); |
| |
| CSSParserTokenRange contents = range.consumeBlock(); |
| const CSSParserToken& uri = contents.consumeIncludingWhitespace(); |
| ASSERT(uri.type() == StringToken); |
| if (!contents.atEnd()) |
| return AtomicString(); |
| return uri.value().toAtomicString(); |
| } |
| |
| StyleRuleCharset* CSSParserImpl::consumeCharsetRule(CSSParserTokenRange prelude) |
| { |
| prelude.consumeWhitespace(); |
| const CSSParserToken& string = prelude.consumeIncludingWhitespace(); |
| if (string.type() != StringToken || !prelude.atEnd()) |
| return nullptr; // Parse error, expected a single string |
| return StyleRuleCharset::create(); |
| } |
| |
| StyleRuleImport* CSSParserImpl::consumeImportRule(CSSParserTokenRange prelude) |
| { |
| prelude.consumeWhitespace(); |
| AtomicString uri(consumeStringOrURI(prelude)); |
| if (uri.isNull()) |
| return nullptr; // Parse error, expected string or URI |
| |
| if (m_observerWrapper) { |
| unsigned endOffset = m_observerWrapper->endOffset(prelude); |
| m_observerWrapper->observer().startRuleHeader(StyleRule::Import, m_observerWrapper->startOffset(prelude)); |
| m_observerWrapper->observer().endRuleHeader(endOffset); |
| m_observerWrapper->observer().startRuleBody(endOffset); |
| m_observerWrapper->observer().endRuleBody(endOffset); |
| } |
| |
| return StyleRuleImport::create(uri, MediaQueryParser::parseMediaQuerySet(prelude)); |
| } |
| |
| StyleRuleNamespace* CSSParserImpl::consumeNamespaceRule(CSSParserTokenRange prelude) |
| { |
| prelude.consumeWhitespace(); |
| AtomicString namespacePrefix; |
| if (prelude.peek().type() == IdentToken) |
| namespacePrefix = prelude.consumeIncludingWhitespace().value().toAtomicString(); |
| |
| AtomicString uri(consumeStringOrURI(prelude)); |
| prelude.consumeWhitespace(); |
| if (uri.isNull() || !prelude.atEnd()) |
| return nullptr; // Parse error, expected string or URI |
| |
| return StyleRuleNamespace::create(namespacePrefix, uri); |
| } |
| |
| StyleRuleMedia* CSSParserImpl::consumeMediaRule(CSSParserTokenRange prelude, CSSParserTokenRange block) |
| { |
| HeapVector<Member<StyleRuleBase>> rules; |
| |
| if (m_observerWrapper) { |
| CSSParserTokenRange preludeWithoutWhitespace = prelude; |
| preludeWithoutWhitespace.consumeWhitespace(); |
| m_observerWrapper->observer().startRuleHeader(StyleRule::Media, m_observerWrapper->startOffset(preludeWithoutWhitespace)); |
| m_observerWrapper->observer().endRuleHeader(m_observerWrapper->endOffset(preludeWithoutWhitespace)); |
| m_observerWrapper->observer().startRuleBody(m_observerWrapper->previousTokenStartOffset(block)); |
| } |
| |
| if (m_styleSheet) |
| m_styleSheet->setHasMediaQueries(); |
| |
| consumeRuleList(block, RegularRuleList, [&rules](StyleRuleBase* rule) { |
| rules.append(rule); |
| }); |
| |
| if (m_observerWrapper) |
| m_observerWrapper->observer().endRuleBody(m_observerWrapper->endOffset(block)); |
| |
| return StyleRuleMedia::create(MediaQueryParser::parseMediaQuerySet(prelude), rules); |
| } |
| |
| StyleRuleSupports* CSSParserImpl::consumeSupportsRule(CSSParserTokenRange prelude, CSSParserTokenRange block) |
| { |
| CSSSupportsParser::SupportsResult supported = CSSSupportsParser::supportsCondition(prelude, *this); |
| if (supported == CSSSupportsParser::Invalid) |
| return nullptr; // Parse error, invalid @supports condition |
| |
| if (m_observerWrapper) { |
| m_observerWrapper->observer().startRuleHeader(StyleRule::Supports, m_observerWrapper->startOffset(prelude)); |
| m_observerWrapper->observer().endRuleHeader(m_observerWrapper->endOffset(prelude)); |
| m_observerWrapper->observer().startRuleBody(m_observerWrapper->previousTokenStartOffset(block)); |
| } |
| |
| HeapVector<Member<StyleRuleBase>> rules; |
| consumeRuleList(block, RegularRuleList, [&rules](StyleRuleBase* rule) { |
| rules.append(rule); |
| }); |
| |
| if (m_observerWrapper) |
| m_observerWrapper->observer().endRuleBody(m_observerWrapper->endOffset(block)); |
| |
| return StyleRuleSupports::create(prelude.serialize().stripWhiteSpace(), supported, rules); |
| } |
| |
| StyleRuleViewport* CSSParserImpl::consumeViewportRule(CSSParserTokenRange prelude, CSSParserTokenRange block) |
| { |
| // Allow @viewport rules from UA stylesheets even if the feature is disabled. |
| if (!RuntimeEnabledFeatures::cssViewportEnabled() && !isUASheetBehavior(m_context.mode())) |
| return nullptr; |
| |
| prelude.consumeWhitespace(); |
| if (!prelude.atEnd()) |
| return nullptr; // Parser error; @viewport prelude should be empty |
| |
| if (m_observerWrapper) { |
| unsigned endOffset = m_observerWrapper->endOffset(prelude); |
| m_observerWrapper->observer().startRuleHeader(StyleRule::Viewport, m_observerWrapper->startOffset(prelude)); |
| m_observerWrapper->observer().endRuleHeader(endOffset); |
| m_observerWrapper->observer().startRuleBody(endOffset); |
| m_observerWrapper->observer().endRuleBody(endOffset); |
| } |
| |
| consumeDeclarationList(block, StyleRule::Viewport); |
| return StyleRuleViewport::create(createStylePropertySet(m_parsedProperties, CSSViewportRuleMode)); |
| } |
| |
| StyleRuleFontFace* CSSParserImpl::consumeFontFaceRule(CSSParserTokenRange prelude, CSSParserTokenRange block) |
| { |
| prelude.consumeWhitespace(); |
| if (!prelude.atEnd()) |
| return nullptr; // Parse error; @font-face prelude should be empty |
| |
| if (m_observerWrapper) { |
| unsigned endOffset = m_observerWrapper->endOffset(prelude); |
| m_observerWrapper->observer().startRuleHeader(StyleRule::FontFace, m_observerWrapper->startOffset(prelude)); |
| m_observerWrapper->observer().endRuleHeader(endOffset); |
| m_observerWrapper->observer().startRuleBody(endOffset); |
| m_observerWrapper->observer().endRuleBody(endOffset); |
| } |
| |
| if (m_styleSheet) |
| m_styleSheet->setHasFontFaceRule(); |
| |
| consumeDeclarationList(block, StyleRule::FontFace); |
| return StyleRuleFontFace::create(createStylePropertySet(m_parsedProperties, m_context.mode())); |
| } |
| |
| StyleRuleKeyframes* CSSParserImpl::consumeKeyframesRule(bool webkitPrefixed, CSSParserTokenRange prelude, CSSParserTokenRange block) |
| { |
| prelude.consumeWhitespace(); |
| CSSParserTokenRange rangeCopy = prelude; // For inspector callbacks |
| const CSSParserToken& nameToken = prelude.consumeIncludingWhitespace(); |
| if (!prelude.atEnd()) |
| return nullptr; // Parse error; expected single non-whitespace token in @keyframes header |
| |
| String name; |
| if (nameToken.type() == IdentToken) { |
| name = nameToken.value().toString(); |
| } else if (nameToken.type() == StringToken && webkitPrefixed) { |
| if (m_context.useCounter()) |
| m_context.useCounter()->count(UseCounter::QuotedKeyframesRule); |
| name = nameToken.value().toString(); |
| } else { |
| return nullptr; // Parse error; expected ident token in @keyframes header |
| } |
| |
| if (m_observerWrapper) { |
| m_observerWrapper->observer().startRuleHeader(StyleRule::Keyframes, m_observerWrapper->startOffset(rangeCopy)); |
| m_observerWrapper->observer().endRuleHeader(m_observerWrapper->endOffset(prelude)); |
| m_observerWrapper->observer().startRuleBody(m_observerWrapper->previousTokenStartOffset(block)); |
| m_observerWrapper->observer().endRuleBody(m_observerWrapper->endOffset(block)); |
| } |
| |
| StyleRuleKeyframes* keyframeRule = StyleRuleKeyframes::create(); |
| consumeRuleList(block, KeyframesRuleList, [keyframeRule](StyleRuleBase* keyframe) { |
| keyframeRule->parserAppendKeyframe(toStyleRuleKeyframe(keyframe)); |
| }); |
| keyframeRule->setName(name); |
| keyframeRule->setVendorPrefixed(webkitPrefixed); |
| return keyframeRule; |
| } |
| |
| StyleRulePage* CSSParserImpl::consumePageRule(CSSParserTokenRange prelude, CSSParserTokenRange block) |
| { |
| CSSSelectorList selectorList = parsePageSelector(prelude, m_styleSheet); |
| if (!selectorList.isValid()) |
| return nullptr; // Parse error, invalid @page selector |
| |
| if (m_observerWrapper) { |
| unsigned endOffset = m_observerWrapper->endOffset(prelude); |
| m_observerWrapper->observer().startRuleHeader(StyleRule::Page, m_observerWrapper->startOffset(prelude)); |
| m_observerWrapper->observer().endRuleHeader(endOffset); |
| } |
| |
| consumeDeclarationList(block, StyleRule::Style); |
| |
| return StyleRulePage::create(std::move(selectorList), createStylePropertySet(m_parsedProperties, m_context.mode())); |
| } |
| |
| void CSSParserImpl::consumeApplyRule(CSSParserTokenRange prelude) |
| { |
| ASSERT(RuntimeEnabledFeatures::cssApplyAtRulesEnabled()); |
| |
| prelude.consumeWhitespace(); |
| const CSSParserToken& ident = prelude.consumeIncludingWhitespace(); |
| if (!prelude.atEnd() || !CSSVariableParser::isValidVariableName(ident)) |
| return; // Parse error, expected a single custom property name |
| m_parsedProperties.append(CSSProperty( |
| CSSPropertyApplyAtRule, |
| *CSSCustomIdentValue::create(ident.value().toString()))); |
| } |
| |
| StyleRuleKeyframe* CSSParserImpl::consumeKeyframeStyleRule(CSSParserTokenRange prelude, CSSParserTokenRange block) |
| { |
| std::unique_ptr<Vector<double>> keyList = consumeKeyframeKeyList(prelude); |
| if (!keyList) |
| return nullptr; |
| |
| if (m_observerWrapper) { |
| m_observerWrapper->observer().startRuleHeader(StyleRule::Keyframe, m_observerWrapper->startOffset(prelude)); |
| m_observerWrapper->observer().endRuleHeader(m_observerWrapper->endOffset(prelude)); |
| } |
| |
| consumeDeclarationList(block, StyleRule::Keyframe); |
| return StyleRuleKeyframe::create(std::move(keyList), createStylePropertySet(m_parsedProperties, m_context.mode())); |
| } |
| |
| static void observeSelectors(CSSParserObserverWrapper& wrapper, CSSParserTokenRange selectors) |
| { |
| // This is easier than hooking into the CSSSelectorParser |
| selectors.consumeWhitespace(); |
| CSSParserTokenRange originalRange = selectors; |
| wrapper.observer().startRuleHeader(StyleRule::Style, wrapper.startOffset(originalRange)); |
| |
| while (!selectors.atEnd()) { |
| const CSSParserToken* selectorStart = &selectors.peek(); |
| while (!selectors.atEnd() && selectors.peek().type() != CommaToken) |
| selectors.consumeComponentValue(); |
| CSSParserTokenRange selector = selectors.makeSubRange(selectorStart, &selectors.peek()); |
| selectors.consumeIncludingWhitespace(); |
| |
| wrapper.observer().observeSelector(wrapper.startOffset(selector), wrapper.endOffset(selector)); |
| } |
| |
| wrapper.observer().endRuleHeader(wrapper.endOffset(originalRange)); |
| } |
| |
| |
| StyleRule* CSSParserImpl::consumeStyleRule(CSSParserTokenRange prelude, CSSParserTokenRange block) |
| { |
| CSSSelectorList selectorList = CSSSelectorParser::parseSelector(prelude, m_context, m_styleSheet); |
| if (!selectorList.isValid()) |
| return nullptr; // Parse error, invalid selector list |
| |
| if (m_observerWrapper) |
| observeSelectors(*m_observerWrapper, prelude); |
| |
| consumeDeclarationList(block, StyleRule::Style); |
| |
| return StyleRule::create(std::move(selectorList), createStylePropertySet(m_parsedProperties, m_context.mode())); |
| } |
| |
| void CSSParserImpl::consumeDeclarationList(CSSParserTokenRange range, StyleRule::RuleType ruleType) |
| { |
| ASSERT(m_parsedProperties.isEmpty()); |
| |
| bool useObserver = m_observerWrapper && (ruleType == StyleRule::Style || ruleType == StyleRule::Keyframe); |
| if (useObserver) { |
| m_observerWrapper->observer().startRuleBody(m_observerWrapper->previousTokenStartOffset(range)); |
| m_observerWrapper->skipCommentsBefore(range, true); |
| } |
| |
| while (!range.atEnd()) { |
| switch (range.peek().type()) { |
| case WhitespaceToken: |
| case SemicolonToken: |
| range.consume(); |
| break; |
| case IdentToken: { |
| const CSSParserToken* declarationStart = &range.peek(); |
| |
| if (useObserver) |
| m_observerWrapper->yieldCommentsBefore(range); |
| |
| while (!range.atEnd() && range.peek().type() != SemicolonToken) |
| range.consumeComponentValue(); |
| |
| consumeDeclaration(range.makeSubRange(declarationStart, &range.peek()), ruleType); |
| |
| if (useObserver) |
| m_observerWrapper->skipCommentsBefore(range, false); |
| break; |
| } |
| case AtKeywordToken: { |
| AllowedRulesType allowedRules = ruleType == StyleRule::Style && RuntimeEnabledFeatures::cssApplyAtRulesEnabled() ? ApplyRules : NoRules; |
| StyleRuleBase* rule = consumeAtRule(range, allowedRules); |
| ASSERT_UNUSED(rule, !rule); |
| break; |
| } |
| default: // Parse error, unexpected token in declaration list |
| while (!range.atEnd() && range.peek().type() != SemicolonToken) |
| range.consumeComponentValue(); |
| break; |
| } |
| } |
| |
| // Yield remaining comments |
| if (useObserver) { |
| m_observerWrapper->yieldCommentsBefore(range); |
| m_observerWrapper->observer().endRuleBody(m_observerWrapper->endOffset(range)); |
| } |
| } |
| |
| void CSSParserImpl::consumeDeclaration(CSSParserTokenRange range, StyleRule::RuleType ruleType) |
| { |
| CSSParserTokenRange rangeCopy = range; // For inspector callbacks |
| |
| ASSERT(range.peek().type() == IdentToken); |
| const CSSParserToken& token = range.consumeIncludingWhitespace(); |
| CSSPropertyID unresolvedProperty = token.parseAsUnresolvedCSSPropertyID(); |
| if (range.consume().type() != ColonToken) |
| return; // Parse error |
| |
| bool important = false; |
| const CSSParserToken* declarationValueEnd = range.end(); |
| const CSSParserToken* last = range.end() - 1; |
| while (last->type() == WhitespaceToken) |
| --last; |
| if (last->type() == IdentToken && equalIgnoringASCIICase(last->value(), "important")) { |
| --last; |
| while (last->type() == WhitespaceToken) |
| --last; |
| if (last->type() == DelimiterToken && last->delimiter() == '!') { |
| important = true; |
| declarationValueEnd = last; |
| } |
| } |
| |
| size_t propertiesCount = m_parsedProperties.size(); |
| if (RuntimeEnabledFeatures::cssVariablesEnabled() && unresolvedProperty == CSSPropertyInvalid && CSSVariableParser::isValidVariableName(token)) { |
| AtomicString variableName = token.value().toAtomicString(); |
| consumeVariableValue(range.makeSubRange(&range.peek(), declarationValueEnd), variableName, important); |
| } |
| |
| if (important && (ruleType == StyleRule::FontFace || ruleType == StyleRule::Keyframe)) |
| return; |
| |
| if (unresolvedProperty != CSSPropertyInvalid) { |
| if (m_styleSheet && m_styleSheet->singleOwnerDocument()) |
| Deprecation::warnOnDeprecatedProperties(m_styleSheet->singleOwnerDocument()->frame(), unresolvedProperty); |
| consumeDeclarationValue(range.makeSubRange(&range.peek(), declarationValueEnd), unresolvedProperty, important, ruleType); |
| } |
| |
| if (m_observerWrapper && (ruleType == StyleRule::Style || ruleType == StyleRule::Keyframe)) { |
| m_observerWrapper->observer().observeProperty( |
| m_observerWrapper->startOffset(rangeCopy), m_observerWrapper->endOffset(rangeCopy), |
| important, m_parsedProperties.size() != propertiesCount); |
| } |
| } |
| |
| void CSSParserImpl::consumeVariableValue(CSSParserTokenRange range, const AtomicString& variableName, bool important) |
| { |
| if (CSSCustomPropertyDeclaration* value = CSSVariableParser::parseDeclarationValue(variableName, range)) |
| m_parsedProperties.append(CSSProperty(CSSPropertyVariable, *value, important)); |
| } |
| |
| void CSSParserImpl::consumeDeclarationValue(CSSParserTokenRange range, CSSPropertyID unresolvedProperty, bool important, StyleRule::RuleType ruleType) |
| { |
| CSSPropertyParser::parseValue(unresolvedProperty, important, range, m_context, m_parsedProperties, ruleType); |
| } |
| |
| std::unique_ptr<Vector<double>> CSSParserImpl::consumeKeyframeKeyList(CSSParserTokenRange range) |
| { |
| std::unique_ptr<Vector<double>> result = wrapUnique(new Vector<double>); |
| while (true) { |
| range.consumeWhitespace(); |
| const CSSParserToken& token = range.consumeIncludingWhitespace(); |
| if (token.type() == PercentageToken && token.numericValue() >= 0 && token.numericValue() <= 100) |
| result->append(token.numericValue() / 100); |
| else if (token.type() == IdentToken && equalIgnoringASCIICase(token.value(), "from")) |
| result->append(0); |
| else if (token.type() == IdentToken && equalIgnoringASCIICase(token.value(), "to")) |
| result->append(1); |
| else |
| return nullptr; // Parser error, invalid value in keyframe selector |
| if (range.atEnd()) |
| return result; |
| if (range.consume().type() != CommaToken) |
| return nullptr; // Parser error |
| } |
| } |
| |
| } // namespace blink |
