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CSSParserImpl.cpp
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1005 lines (848 loc) · 41 KB
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// Copyright 2014 The Chromium Authors. All rights reserved.
// Copyright (C) 2016-2022 Apple Inc. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "config.h"
#include "CSSParserImpl.h"
#include "CSSAtRuleID.h"
#include "CSSCounterStyleRule.h"
#include "CSSCustomPropertyValue.h"
#include "CSSFontFamily.h"
#include "CSSFontPaletteValuesOverrideColorsValue.h"
#include "CSSKeyframeRule.h"
#include "CSSKeyframesRule.h"
#include "CSSParserObserver.h"
#include "CSSParserObserverWrapper.h"
#include "CSSParserSelector.h"
#include "CSSPropertyParser.h"
#include "CSSSelectorParser.h"
#include "CSSStyleSheet.h"
#include "CSSSupportsParser.h"
#include "CSSTokenizer.h"
#include "CSSVariableParser.h"
#include "ContainerQueryParser.h"
#include "Document.h"
#include "Element.h"
#include "FontPaletteValues.h"
#include "MediaList.h"
#include "MediaQueryParser.h"
#include "MediaQueryParserContext.h"
#include "StyleProperties.h"
#include "StyleRuleImport.h"
#include "StyleSheetContents.h"
#include <bitset>
#include <memory>
namespace WebCore {
CSSParserImpl::CSSParserImpl(const CSSParserContext& context, StyleSheetContents* styleSheet)
: m_context(context)
, m_styleSheet(styleSheet)
{
}
CSSParserImpl::CSSParserImpl(const CSSParserContext& context, const String& string, StyleSheetContents* styleSheet, CSSParserObserverWrapper* wrapper)
: m_context(context)
, m_styleSheet(styleSheet)
, m_tokenizer(wrapper ? CSSTokenizer::tryCreate(string, *wrapper) : CSSTokenizer::tryCreate(string))
, m_observerWrapper(wrapper)
{
}
CSSParser::ParseResult CSSParserImpl::parseValue(MutableStyleProperties* declaration, CSSPropertyID propertyID, const String& string, bool important, const CSSParserContext& context)
{
CSSParserImpl parser(context, string);
auto ruleType = context.enclosingRuleType.value_or(StyleRuleType::Style);
parser.consumeDeclarationValue(parser.tokenizer()->tokenRange(), propertyID, important, ruleType);
if (parser.m_parsedProperties.isEmpty())
return CSSParser::ParseResult::Error;
return declaration->addParsedProperties(parser.m_parsedProperties) ? CSSParser::ParseResult::Changed : CSSParser::ParseResult::Unchanged;
}
CSSParser::ParseResult CSSParserImpl::parseCustomPropertyValue(MutableStyleProperties* declaration, const AtomString& propertyName, const String& string, bool important, const CSSParserContext& context)
{
CSSParserImpl parser(context, string);
parser.consumeCustomPropertyValue(parser.tokenizer()->tokenRange(), propertyName, important);
if (parser.m_parsedProperties.isEmpty())
return CSSParser::ParseResult::Error;
return declaration->addParsedProperties(parser.m_parsedProperties) ? CSSParser::ParseResult::Changed : CSSParser::ParseResult::Unchanged;
}
static inline void filterProperties(bool important, const ParsedPropertyVector& input, ParsedPropertyVector& output, size_t& unusedEntries, std::bitset<numCSSProperties>& seenProperties, HashSet<AtomString>& 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() == CSSPropertyCustom) {
auto& name = downcast<CSSCustomPropertyValue>(*property.value()).name();
if (!seenCustomProperties.add(name).isNewEntry)
continue;
output[--unusedEntries] = property;
continue;
}
auto seenPropertyBit = seenProperties[propertyIDIndex];
if (seenPropertyBit)
continue;
seenPropertyBit = true;
output[--unusedEntries] = property;
}
}
static Ref<ImmutableStyleProperties> createStyleProperties(ParsedPropertyVector& parsedProperties, CSSParserMode mode)
{
std::bitset<numCSSProperties> seenProperties;
size_t unusedEntries = parsedProperties.size();
ParsedPropertyVector results(unusedEntries);
HashSet<AtomString> seenCustomProperties;
filterProperties(true, parsedProperties, results, unusedEntries, seenProperties, seenCustomProperties);
filterProperties(false, parsedProperties, results, unusedEntries, seenProperties, seenCustomProperties);
Ref<ImmutableStyleProperties> result = ImmutableStyleProperties::create(results.data() + unusedEntries, results.size() - unusedEntries, mode);
parsedProperties.clear();
return result;
}
Ref<ImmutableStyleProperties> CSSParserImpl::parseInlineStyleDeclaration(const String& string, const Element* element)
{
CSSParserContext context(element->document());
context.mode = strictToCSSParserMode(element->isHTMLElement() && !element->document().inQuirksMode());
CSSParserImpl parser(context, string);
parser.consumeDeclarationList(parser.tokenizer()->tokenRange(), StyleRuleType::Style);
return createStyleProperties(parser.m_parsedProperties, context.mode);
}
bool CSSParserImpl::parseDeclarationList(MutableStyleProperties* declaration, const String& string, const CSSParserContext& context)
{
CSSParserImpl parser(context, string);
auto ruleType = context.enclosingRuleType.value_or(StyleRuleType::Style);
parser.consumeDeclarationList(parser.tokenizer()->tokenRange(), ruleType);
if (parser.m_parsedProperties.isEmpty())
return false;
std::bitset<numCSSProperties> seenProperties;
size_t unusedEntries = parser.m_parsedProperties.size();
ParsedPropertyVector results(unusedEntries);
HashSet<AtomString> 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);
}
RefPtr<StyleRuleBase> CSSParserImpl::parseRule(const String& string, const CSSParserContext& context, StyleSheetContents* styleSheet, AllowedRulesType allowedRules)
{
CSSParserImpl parser(context, string, styleSheet);
CSSParserTokenRange range = parser.tokenizer()->tokenRange();
range.consumeWhitespace();
if (range.atEnd())
return nullptr; // Parse error, empty rule
RefPtr<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)
{
CSSParserImpl parser(context, string, &styleSheet, nullptr);
bool firstRuleValid = parser.consumeRuleList(parser.tokenizer()->tokenRange(), TopLevelRuleList, [&styleSheet](RefPtr<StyleRuleBase> rule) {
if (rule->isCharsetRule())
return;
styleSheet.parserAppendRule(rule.releaseNonNull());
});
styleSheet.setHasSyntacticallyValidCSSHeader(firstRuleValid);
styleSheet.shrinkToFit();
}
CSSSelectorList CSSParserImpl::parsePageSelector(CSSParserTokenRange range, StyleSheetContents* styleSheet)
{
// We only support a small subset of the css-page spec.
range.consumeWhitespace();
AtomString typeSelector;
if (range.peek().type() == IdentToken)
typeSelector = range.consume().value().toAtomString();
StringView pseudo;
if (range.peek().type() == ColonToken) {
range.consume();
if (range.peek().type() != IdentToken)
return CSSSelectorList();
pseudo = range.consume().value();
}
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 = makeUnique<CSSParserSelector>(QualifiedName(nullAtom(), typeSelector, styleSheet->defaultNamespace()));
else {
selector = makeUnique<CSSParserSelector>();
if (!pseudo.isNull()) {
selector = std::unique_ptr<CSSParserSelector>(CSSParserSelector::parsePagePseudoSelector(pseudo));
if (!selector || selector->match() != CSSSelector::PagePseudoClass)
return CSSSelectorList();
}
if (!typeSelector.isNull())
selector->prependTagSelector(QualifiedName(nullAtom(), typeSelector, styleSheet->defaultNamespace()));
}
selector->setForPage();
return CSSSelectorList { Vector<std::unique_ptr<CSSParserSelector>>::from(WTFMove(selector)) };
}
Vector<double> CSSParserImpl::parseKeyframeKeyList(const String& keyList)
{
return consumeKeyframeKeyList(CSSTokenizer(keyList).tokenRange());
}
bool CSSParserImpl::supportsDeclaration(CSSParserTokenRange& range)
{
ASSERT(m_parsedProperties.isEmpty());
consumeDeclaration(range, StyleRuleType::Style);
bool result = !m_parsedProperties.isEmpty();
m_parsedProperties.clear();
return result;
}
void CSSParserImpl::parseDeclarationListForInspector(const String& declaration, const CSSParserContext& context, CSSParserObserver& observer)
{
CSSParserObserverWrapper wrapper(observer);
CSSParserImpl parser(context, declaration, nullptr, &wrapper);
observer.startRuleHeader(StyleRuleType::Style, 0);
observer.endRuleHeader(1);
parser.consumeDeclarationList(parser.tokenizer()->tokenRange(), StyleRuleType::Style);
}
void CSSParserImpl::parseStyleSheetForInspector(const String& string, const CSSParserContext& context, StyleSheetContents* styleSheet, CSSParserObserver& observer)
{
CSSParserObserverWrapper wrapper(observer);
CSSParserImpl parser(context, string, styleSheet, &wrapper);
bool firstRuleValid = parser.consumeRuleList(parser.tokenizer()->tokenRange(), TopLevelRuleList, [&styleSheet](RefPtr<StyleRuleBase> rule) {
if (rule->isCharsetRule())
return;
styleSheet->parserAppendRule(rule.releaseNonNull());
});
styleSheet->setHasSyntacticallyValidCSSHeader(firstRuleValid);
}
static CSSParserImpl::AllowedRulesType computeNewAllowedRules(CSSParserImpl::AllowedRulesType allowedRules, StyleRuleBase* rule)
{
if (!rule || allowedRules == CSSParserImpl::KeyframeRules || allowedRules == CSSParserImpl::CounterStyleRules || allowedRules == CSSParserImpl::NoRules)
return allowedRules;
ASSERT(allowedRules <= CSSParserImpl::RegularRules);
if (rule->isCharsetRule())
return CSSParserImpl::AllowLayerStatementRules;
if (allowedRules <= CSSParserImpl::AllowLayerStatementRules && rule->isLayerRule() && downcast<StyleRuleLayer>(*rule).isStatement())
return CSSParserImpl::AllowLayerStatementRules;
if (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()) {
RefPtr<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.get());
callback(rule);
}
}
return firstRuleValid;
}
RefPtr<StyleRuleBase> CSSParserImpl::consumeAtRule(CSSParserTokenRange& range, AllowedRulesType allowedRules)
{
ASSERT(range.peek().type() == AtKeywordToken);
const StringView name = range.consumeIncludingWhitespace().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 (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 <= RegularRules && id == CSSAtRuleLayer)
return consumeLayerRule(prelude, { });
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)
return nullptr;
ASSERT(allowedRules <= RegularRules);
switch (id) {
case CSSAtRuleMedia:
return consumeMediaRule(prelude, block);
case CSSAtRuleSupports:
return consumeSupportsRule(prelude, block);
case CSSAtRuleFontFace:
return consumeFontFaceRule(prelude, block);
case CSSAtRuleFontPaletteValues:
return consumeFontPaletteValuesRule(prelude, block);
case CSSAtRuleWebkitKeyframes:
return consumeKeyframesRule(true, prelude, block);
case CSSAtRuleKeyframes:
return consumeKeyframesRule(false, prelude, block);
case CSSAtRulePage:
return consumePageRule(prelude, block);
case CSSAtRuleCounterStyle:
return consumeCounterStyleRule(prelude, block);
case CSSAtRuleLayer:
return consumeLayerRule(prelude, block);
case CSSAtRuleContainer:
return consumeContainerRule(prelude, block);
default:
return nullptr; // Parse error, unrecognised at-rule with block
}
}
RefPtr<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.consumeBlockCheckingForEditability(m_styleSheet.get());
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 AtomString consumeStringOrURI(CSSParserTokenRange& range)
{
const CSSParserToken& token = range.peek();
if (token.type() == StringToken || token.type() == UrlToken)
return range.consumeIncludingWhitespace().value().toAtomString();
if (token.type() != FunctionToken || !equalLettersIgnoringASCIICase(token.value(), "url"_s))
return AtomString();
CSSParserTokenRange contents = range.consumeBlock();
const CSSParserToken& uri = contents.consumeIncludingWhitespace();
if (uri.type() == BadStringToken || !contents.atEnd())
return AtomString();
return uri.value().toAtomString();
}
RefPtr<StyleRuleCharset> CSSParserImpl::consumeCharsetRule(CSSParserTokenRange prelude)
{
const CSSParserToken& string = prelude.consumeIncludingWhitespace();
if (string.type() != StringToken || !prelude.atEnd())
return nullptr; // Parse error, expected a single string
return StyleRuleCharset::create();
}
enum class AllowAnonymous { Yes, No };
static std::optional<CascadeLayerName> consumeCascadeLayerName(CSSParserTokenRange& range, AllowAnonymous allowAnonymous)
{
CascadeLayerName name;
if (range.atEnd()) {
if (allowAnonymous == AllowAnonymous::Yes)
return name;
return { };
}
while (true) {
auto nameToken = range.consume();
if (nameToken.type() != IdentToken)
return { };
name.append(nameToken.value().toAtomString());
if (range.peek().type() != DelimiterToken || range.peek().delimiter() != '.')
break;
range.consume();
}
range.consumeWhitespace();
return name;
}
RefPtr<StyleRuleImport> CSSParserImpl::consumeImportRule(CSSParserTokenRange prelude)
{
AtomString 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(StyleRuleType::Import, m_observerWrapper->startOffset(prelude));
m_observerWrapper->observer().endRuleHeader(endOffset);
m_observerWrapper->observer().startRuleBody(endOffset);
m_observerWrapper->observer().endRuleBody(endOffset);
}
prelude.consumeWhitespace();
auto consumeCascadeLayer = [&]() -> std::optional<CascadeLayerName> {
if (!m_context.cascadeLayersEnabled)
return { };
auto& token = prelude.peek();
if (token.type() == FunctionToken && equalLettersIgnoringASCIICase(token.value(), "layer"_s)) {
auto savedPreludeForFailure = prelude;
auto contents = CSSPropertyParserHelpers::consumeFunction(prelude);
auto layerName = consumeCascadeLayerName(contents, AllowAnonymous::No);
if (!layerName || !contents.atEnd()) {
prelude = savedPreludeForFailure;
return { };
}
return layerName;
}
if (token.type() == IdentToken && equalLettersIgnoringASCIICase(token.value(), "layer"_s)) {
prelude.consumeIncludingWhitespace();
return CascadeLayerName { };
}
return { };
};
auto cascadeLayerName = consumeCascadeLayer();
auto mediaQuerySet = MediaQueryParser::parseMediaQuerySet(prelude, MediaQueryParserContext(m_context));
return StyleRuleImport::create(uri, mediaQuerySet.releaseNonNull(), WTFMove(cascadeLayerName));
}
RefPtr<StyleRuleNamespace> CSSParserImpl::consumeNamespaceRule(CSSParserTokenRange prelude)
{
AtomString namespacePrefix;
if (prelude.peek().type() == IdentToken)
namespacePrefix = prelude.consumeIncludingWhitespace().value().toAtomString();
AtomString uri(consumeStringOrURI(prelude));
if (uri.isNull() || !prelude.atEnd())
return nullptr; // Parse error, expected string or URI
return StyleRuleNamespace::create(namespacePrefix, uri);
}
RefPtr<StyleRuleMedia> CSSParserImpl::consumeMediaRule(CSSParserTokenRange prelude, CSSParserTokenRange block)
{
Vector<RefPtr<StyleRuleBase>> rules;
if (m_observerWrapper) {
m_observerWrapper->observer().startRuleHeader(StyleRuleType::Media, m_observerWrapper->startOffset(prelude));
m_observerWrapper->observer().endRuleHeader(m_observerWrapper->endOffset(prelude));
m_observerWrapper->observer().startRuleBody(m_observerWrapper->previousTokenStartOffset(block));
}
consumeRuleList(block, RegularRuleList, [&rules](RefPtr<StyleRuleBase> rule) {
rules.append(rule);
});
rules.shrinkToFit();
if (m_observerWrapper)
m_observerWrapper->observer().endRuleBody(m_observerWrapper->endOffset(block));
return StyleRuleMedia::create(MediaQueryParser::parseMediaQuerySet(prelude, { m_context }).releaseNonNull(), WTFMove(rules));
}
RefPtr<StyleRuleSupports> CSSParserImpl::consumeSupportsRule(CSSParserTokenRange prelude, CSSParserTokenRange block)
{
auto supported = CSSSupportsParser::supportsCondition(prelude, *this, CSSSupportsParser::ForAtRule);
if (supported == CSSSupportsParser::Invalid)
return nullptr; // Parse error, invalid @supports condition
if (m_observerWrapper) {
m_observerWrapper->observer().startRuleHeader(StyleRuleType::Supports, m_observerWrapper->startOffset(prelude));
m_observerWrapper->observer().endRuleHeader(m_observerWrapper->endOffset(prelude));
m_observerWrapper->observer().startRuleBody(m_observerWrapper->previousTokenStartOffset(block));
}
Vector<RefPtr<StyleRuleBase>> rules;
consumeRuleList(block, RegularRuleList, [&rules](RefPtr<StyleRuleBase> rule) {
rules.append(rule);
});
rules.shrinkToFit();
if (m_observerWrapper)
m_observerWrapper->observer().endRuleBody(m_observerWrapper->endOffset(block));
return StyleRuleSupports::create(prelude.serialize().stripWhiteSpace(), supported, WTFMove(rules));
}
RefPtr<StyleRuleFontFace> CSSParserImpl::consumeFontFaceRule(CSSParserTokenRange prelude, CSSParserTokenRange block)
{
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(StyleRuleType::FontFace, m_observerWrapper->startOffset(prelude));
m_observerWrapper->observer().endRuleHeader(endOffset);
m_observerWrapper->observer().startRuleBody(endOffset);
m_observerWrapper->observer().endRuleBody(endOffset);
}
consumeDeclarationList(block, StyleRuleType::FontFace);
return StyleRuleFontFace::create(createStyleProperties(m_parsedProperties, m_context.mode));
}
RefPtr<StyleRuleFontPaletteValues> CSSParserImpl::consumeFontPaletteValuesRule(CSSParserTokenRange prelude, CSSParserTokenRange block)
{
auto name = CSSPropertyParserHelpers::consumeDashedIdent(prelude);
if (!name || !prelude.atEnd())
return nullptr; // Parse error; expected custom ident in @font-palette-values header
if (m_observerWrapper) {
unsigned endOffset = m_observerWrapper->endOffset(prelude);
m_observerWrapper->observer().startRuleHeader(StyleRuleType::FontPaletteValues, m_observerWrapper->startOffset(prelude));
m_observerWrapper->observer().endRuleHeader(endOffset);
m_observerWrapper->observer().startRuleBody(endOffset);
m_observerWrapper->observer().endRuleBody(endOffset);
}
consumeDeclarationList(block, StyleRuleType::FontPaletteValues);
auto properties = createStyleProperties(m_parsedProperties, m_context.mode);
AtomString fontFamily;
if (auto fontFamilyValue = properties->getPropertyCSSValue(CSSPropertyFontFamily))
fontFamily = AtomString { downcast<CSSPrimitiveValue>(*fontFamilyValue).fontFamily().familyName };
std::optional<FontPaletteIndex> basePalette;
if (auto basePaletteValue = properties->getPropertyCSSValue(CSSPropertyBasePalette)) {
const auto& primitiveValue = downcast<CSSPrimitiveValue>(*basePaletteValue);
if (primitiveValue.isInteger())
basePalette = FontPaletteIndex(primitiveValue.value<unsigned>());
else if (primitiveValue.valueID() == CSSValueLight)
basePalette = FontPaletteIndex(FontPaletteIndex::Type::Light);
else if (primitiveValue.valueID() == CSSValueDark)
basePalette = FontPaletteIndex(FontPaletteIndex::Type::Dark);
}
Vector<FontPaletteValues::OverriddenColor> overrideColors;
if (auto overrideColorsValue = properties->getPropertyCSSValue(CSSPropertyOverrideColors)) {
const auto& list = downcast<CSSValueList>(*overrideColorsValue);
for (const auto& item : list) {
const auto& pair = downcast<CSSFontPaletteValuesOverrideColorsValue>(item.get());
if (!pair.key().isInteger())
continue;
unsigned key = pair.key().value<unsigned>();
Color color = pair.color().isRGBColor() ? pair.color().color() : StyleColor::colorFromKeyword(pair.color().valueID(), { });
overrideColors.append(std::make_pair(key, color));
}
}
return StyleRuleFontPaletteValues::create(AtomString { name->stringValue() }, AtomString { fontFamily }, WTFMove(basePalette), WTFMove(overrideColors));
}
RefPtr<StyleRuleKeyframes> CSSParserImpl::consumeKeyframesRule(bool webkitPrefixed, CSSParserTokenRange prelude, CSSParserTokenRange block)
{
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
AtomString name;
if (nameToken.type() == IdentToken) {
name = nameToken.value().toAtomString();
} else if (nameToken.type() == StringToken && webkitPrefixed)
name = nameToken.value().toAtomString();
else
return nullptr; // Parse error; expected ident token in @keyframes header
if (m_observerWrapper) {
m_observerWrapper->observer().startRuleHeader(StyleRuleType::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));
}
RefPtr<StyleRuleKeyframes> keyframeRule = StyleRuleKeyframes::create(name);
consumeRuleList(block, KeyframesRuleList, [keyframeRule](const RefPtr<StyleRuleBase>& keyframe) {
keyframeRule->parserAppendKeyframe(downcast<const StyleRuleKeyframe>(keyframe.get()));
});
// FIXME-NEWPARSER: Find out why this is done. Behavior difference when prefixed?
// keyframeRule->setVendorPrefixed(webkitPrefixed);
keyframeRule->shrinkToFit();
return keyframeRule;
}
RefPtr<StyleRulePage> CSSParserImpl::consumePageRule(CSSParserTokenRange prelude, CSSParserTokenRange block)
{
CSSSelectorList selectorList = parsePageSelector(prelude, m_styleSheet.get());
if (selectorList.isEmpty())
return nullptr; // Parse error, invalid @page selector
if (m_observerWrapper) {
unsigned endOffset = m_observerWrapper->endOffset(prelude);
m_observerWrapper->observer().startRuleHeader(StyleRuleType::Page, m_observerWrapper->startOffset(prelude));
m_observerWrapper->observer().endRuleHeader(endOffset);
}
consumeDeclarationList(block, StyleRuleType::Style);
return StyleRulePage::create(createStyleProperties(m_parsedProperties, m_context.mode), WTFMove(selectorList));
}
RefPtr<StyleRuleCounterStyle> CSSParserImpl::consumeCounterStyleRule(CSSParserTokenRange prelude, CSSParserTokenRange block)
{
if (!m_context.propertySettings.cssCounterStyleAtRulesEnabled)
return nullptr;
auto rangeCopy = prelude; // For inspector callbacks
auto name = CSSPropertyParserHelpers::consumeCounterStyleNameInPrelude(rangeCopy);
if (name.isNull())
return nullptr;
if (m_observerWrapper) {
m_observerWrapper->observer().startRuleHeader(StyleRuleType::CounterStyle, 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));
}
consumeDeclarationList(block, StyleRuleType::CounterStyle);
return StyleRuleCounterStyle::create(name, createStyleProperties(m_parsedProperties, m_context.mode));
}
RefPtr<StyleRuleLayer> CSSParserImpl::consumeLayerRule(CSSParserTokenRange prelude, std::optional<CSSParserTokenRange> block)
{
if (!m_context.cascadeLayersEnabled)
return nullptr;
auto preludeCopy = prelude;
if (!block) {
// List syntax.
Vector<CascadeLayerName> nameList;
while (true) {
auto name = consumeCascadeLayerName(prelude, AllowAnonymous::No);
if (!name)
return nullptr;
nameList.append(*name);
if (prelude.atEnd())
break;
auto commaToken = prelude.consumeIncludingWhitespace();
if (commaToken.type() != CommaToken)
return { };
}
if (m_observerWrapper) {
unsigned endOffset = m_observerWrapper->endOffset(preludeCopy);
m_observerWrapper->observer().startRuleHeader(StyleRuleType::LayerStatement, m_observerWrapper->startOffset(preludeCopy));
m_observerWrapper->observer().endRuleHeader(endOffset);
m_observerWrapper->observer().startRuleBody(endOffset);
m_observerWrapper->observer().endRuleBody(endOffset);
}
return StyleRuleLayer::createStatement(WTFMove(nameList));
}
auto name = consumeCascadeLayerName(prelude, AllowAnonymous::Yes);
if (!name)
return nullptr;
// No comma separated list when using the block syntax.
if (!prelude.atEnd())
return nullptr;
if (m_observerWrapper) {
m_observerWrapper->observer().startRuleHeader(StyleRuleType::LayerBlock, m_observerWrapper->startOffset(preludeCopy));
m_observerWrapper->observer().endRuleHeader(m_observerWrapper->endOffset(preludeCopy));
m_observerWrapper->observer().startRuleBody(m_observerWrapper->previousTokenStartOffset(*block));
}
Vector<RefPtr<StyleRuleBase>> rules;
consumeRuleList(*block, RegularRuleList, [&](RefPtr<StyleRuleBase> rule) {
rules.append(rule);
});
rules.shrinkToFit();
if (m_observerWrapper)
m_observerWrapper->observer().endRuleBody(m_observerWrapper->endOffset(*block));
return StyleRuleLayer::createBlock(WTFMove(*name), WTFMove(rules));
}
RefPtr<StyleRuleContainer> CSSParserImpl::consumeContainerRule(CSSParserTokenRange prelude, CSSParserTokenRange block)
{
if (!m_context.propertySettings.cssContainerQueriesEnabled)
return nullptr;
if (prelude.atEnd())
return nullptr;
auto query = ContainerQueryParser::consumeFilteredContainerQuery(prelude, m_context);
if (!query)
return nullptr;
prelude.consumeWhitespace();
if (!prelude.atEnd())
return nullptr;
Vector<RefPtr<StyleRuleBase>> rules;
if (m_observerWrapper) {
m_observerWrapper->observer().startRuleHeader(StyleRuleType::Container, m_observerWrapper->startOffset(prelude));
m_observerWrapper->observer().endRuleHeader(m_observerWrapper->endOffset(prelude));
m_observerWrapper->observer().startRuleBody(m_observerWrapper->previousTokenStartOffset(block));
}
consumeRuleList(block, RegularRuleList, [&rules](RefPtr<StyleRuleBase> rule) {
rules.append(rule);
});
rules.shrinkToFit();
if (m_observerWrapper)
m_observerWrapper->observer().endRuleBody(m_observerWrapper->endOffset(block));
return StyleRuleContainer::create(WTFMove(*query), WTFMove(rules));
}
RefPtr<StyleRuleKeyframe> CSSParserImpl::consumeKeyframeStyleRule(CSSParserTokenRange prelude, CSSParserTokenRange block)
{
auto keyList = consumeKeyframeKeyList(prelude);
if (keyList.isEmpty())
return nullptr;
if (m_observerWrapper) {
m_observerWrapper->observer().startRuleHeader(StyleRuleType::Keyframe, m_observerWrapper->startOffset(prelude));
m_observerWrapper->observer().endRuleHeader(m_observerWrapper->endOffset(prelude));
}
consumeDeclarationList(block, StyleRuleType::Keyframe);
return StyleRuleKeyframe::create(WTFMove(keyList), createStyleProperties(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(StyleRuleType::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));
}
RefPtr<StyleRule> CSSParserImpl::consumeStyleRule(CSSParserTokenRange prelude, CSSParserTokenRange block)
{
auto selectorList = parseCSSSelector(prelude, m_context, m_styleSheet.get());
if (!selectorList)
return nullptr; // Parse error, invalid selector list
if (m_observerWrapper)
observeSelectors(*m_observerWrapper, prelude);
consumeDeclarationList(block, StyleRuleType::Style);
return StyleRule::create(createStyleProperties(m_parsedProperties, m_context.mode), m_context.hasDocumentSecurityOrigin, WTFMove(*selectorList));
}
void CSSParserImpl::consumeDeclarationList(CSSParserTokenRange range, StyleRuleType ruleType)
{
ASSERT(m_parsedProperties.isEmpty());
bool useObserver = m_observerWrapper && (ruleType == StyleRuleType::Style || ruleType == StyleRuleType::Keyframe || ruleType == StyleRuleType::CounterStyle);
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: {
RefPtr<StyleRuleBase> rule = consumeAtRule(range, NoRules);
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));
}
}
static void removeTrailingWhitespace(const CSSParserTokenRange& range, const CSSParserToken*& position)
{
while (position != range.begin() && position[-1].type() == WhitespaceToken)
--position;
}
// https://drafts.csswg.org/css-syntax/#consume-declaration
void CSSParserImpl::consumeDeclaration(CSSParserTokenRange range, StyleRuleType ruleType)
{
CSSParserTokenRange rangeCopy = range; // For inspector callbacks
ASSERT(range.peek().type() == IdentToken);
auto& token = range.consumeIncludingWhitespace();
auto propertyID = token.parseAsCSSPropertyID();
if (range.consume().type() != ColonToken)
return; // Parse error
range.consumeWhitespace();
auto declarationValueEnd = range.end();
bool important = false;
if (!range.atEnd()) {
auto end = range.end();
removeTrailingWhitespace(range, end);
declarationValueEnd = end;
if (end[-1].type() == IdentToken && equalLettersIgnoringASCIICase(end[-1].value(), "important"_s)) {
--end;
removeTrailingWhitespace(range, end);
if (end[-1].type() == DelimiterToken && end[-1].delimiter() == '!') {
important = true;
--end;
removeTrailingWhitespace(range, end);
declarationValueEnd = end;
}
}
}
size_t propertiesCount = m_parsedProperties.size();
if (!isCSSPropertyExposed(propertyID, &m_context.propertySettings))
propertyID = CSSPropertyInvalid;
if (propertyID == CSSPropertyInvalid && CSSVariableParser::isValidVariableName(token)) {
AtomString variableName = token.value().toAtomString();
consumeCustomPropertyValue(range.makeSubRange(&range.peek(), declarationValueEnd), variableName, important);
}
if (important && (ruleType == StyleRuleType::FontFace || ruleType == StyleRuleType::Keyframe || ruleType == StyleRuleType::CounterStyle || ruleType == StyleRuleType::FontPaletteValues))
return;
if (propertyID != CSSPropertyInvalid)
consumeDeclarationValue(range.makeSubRange(&range.peek(), declarationValueEnd), propertyID, important, ruleType);
if (m_observerWrapper && (ruleType == StyleRuleType::Style || ruleType == StyleRuleType::Keyframe)) {
m_observerWrapper->observer().observeProperty(
m_observerWrapper->startOffset(rangeCopy), m_observerWrapper->endOffset(rangeCopy),
important, m_parsedProperties.size() != propertiesCount);
}
}
void CSSParserImpl::consumeCustomPropertyValue(CSSParserTokenRange range, const AtomString& variableName, bool important)
{
if (range.atEnd())
m_parsedProperties.append(CSSProperty(CSSPropertyCustom, CSSCustomPropertyValue::createEmpty(variableName), important));
else if (auto value = CSSVariableParser::parseDeclarationValue(variableName, range, m_context))
m_parsedProperties.append(CSSProperty(CSSPropertyCustom, WTFMove(value), important));
}
void CSSParserImpl::consumeDeclarationValue(CSSParserTokenRange range, CSSPropertyID propertyID, bool important, StyleRuleType ruleType)
{
CSSPropertyParser::parseValue(propertyID, important, range, m_context, m_parsedProperties, ruleType);
}
Vector<double> CSSParserImpl::consumeKeyframeKeyList(CSSParserTokenRange range)
{
Vector<double> result;
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 && equalLettersIgnoringASCIICase(token.value(), "from"_s))
result.append(0);
else if (token.type() == IdentToken && equalLettersIgnoringASCIICase(token.value(), "to"_s))
result.append(1);
else
return { }; // Parser error, invalid value in keyframe selector
if (range.atEnd()) {
result.shrinkToFit();
return result;
}
if (range.consume().type() != CommaToken)