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/*
* Copyright (C) 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* 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.
*/
#pragma once
#include "CSSParserContext.h"
#include "CSSParserTokenRange.h"
#include "GenericMediaQueryTypes.h"
#include <wtf/RobinHoodHashMap.h>
#include <wtf/text/AtomStringHash.h>
namespace WebCore {
struct MediaQueryParserContext;
namespace MQ {
struct FeatureParser {
static std::optional<Feature> consumeFeature(CSSParserTokenRange&, const MediaQueryParserContext&);
static std::optional<Feature> consumeBooleanOrPlainFeature(CSSParserTokenRange&, const MediaQueryParserContext&);
static std::optional<Feature> consumeRangeFeature(CSSParserTokenRange&, const MediaQueryParserContext&);
static RefPtr<CSSValue> consumeValue(CSSParserTokenRange&, const MediaQueryParserContext&);
static bool validateFeatureAgainstSchema(Feature&, const FeatureSchema&);
};
template<typename ConcreteParser>
struct GenericMediaQueryParser {
struct State {
std::optional<CSSValueID> inFunctionId;
};
static std::optional<Condition> consumeCondition(CSSParserTokenRange& range, const MediaQueryParserContext& context)
{
State state;
return consumeCondition(range, context, state);
}
static std::optional<Condition> consumeCondition(CSSParserTokenRange&, const MediaQueryParserContext&, State&);
static std::optional<QueryInParens> consumeQueryInParens(CSSParserTokenRange&, const MediaQueryParserContext&, State&);
static std::optional<Feature> consumeAndValidateFeature(CSSParserTokenRange&, const MediaQueryParserContext&, State&);
static bool isValidFunctionId(CSSValueID) { return false; }
static const FeatureSchema* schemaForFeatureName(const AtomString&, const MediaQueryParserContext&, State&);
static bool validateFeature(Feature&, const MediaQueryParserContext&, State&);
};
template<typename ConcreteParser>
std::optional<Condition> GenericMediaQueryParser<ConcreteParser>::consumeCondition(CSSParserTokenRange& range, const MediaQueryParserContext& context, State& state)
{
if (range.peek().type() == IdentToken) {
if (range.peek().id() == CSSValueNot) {
range.consumeIncludingWhitespace();
auto query = consumeQueryInParens(range, context, state);
if (!query || !range.atEnd())
return { };
return Condition { LogicalOperator::Not, { *query } };
}
}
Condition condition;
auto consumeOperator = [&]() -> std::optional<LogicalOperator> {
auto operatorToken = range.consumeIncludingWhitespace();
if (operatorToken.type() != IdentToken)
return { };
if (operatorToken.id() == CSSValueAnd)
return LogicalOperator::And;
if (operatorToken.id() == CSSValueOr)
return LogicalOperator::Or;
return { };
};
do {
if (!condition.queries.isEmpty()) {
auto op = consumeOperator();
if (!op)
return { };
if (condition.queries.size() > 1 && condition.logicalOperator != *op)
return { };
condition.logicalOperator = *op;
}
auto query = consumeQueryInParens(range, context, state);
if (!query)
return { };
condition.queries.append(*query);
} while (!range.atEnd());
return condition;
}
template<typename ConcreteParser>
std::optional<QueryInParens> GenericMediaQueryParser<ConcreteParser>::consumeQueryInParens(CSSParserTokenRange& range, const MediaQueryParserContext& context, State& state)
{
std::optional<CSSValueID> functionId;
if (range.peek().type() == FunctionToken) {
if (state.inFunctionId)
return { };
functionId = range.peek().functionId();
if (!ConcreteParser::isValidFunctionId(*functionId)) {
auto name = range.peek().value();
auto functionRange = range.consumeBlock();
range.consumeWhitespace();
return GeneralEnclosed { name.toString(), functionRange.serialize() };
}
}
if (!functionId && range.peek().type() != LeftParenthesisToken)
return { };
auto originalBlockRange = range.consumeBlock();
range.consumeWhitespace();
auto blockRange = originalBlockRange;
blockRange.consumeWhitespace();
SetForScope functionScope(state.inFunctionId, functionId ? *functionId : state.inFunctionId);
auto conditionRange = blockRange;
if (auto condition = consumeCondition(conditionRange, context, state)) {
condition->functionId = functionId;
return { condition };
}
auto featureRange = blockRange;
if (auto feature = consumeAndValidateFeature(featureRange, context, state)) {
feature->functionId = functionId;
return { *feature };
}
return GeneralEnclosed { functionId ? nameString(*functionId) : nullAtom(), originalBlockRange.serialize() };
}
template<typename ConcreteParser>
std::optional<Feature> GenericMediaQueryParser<ConcreteParser>::consumeAndValidateFeature(CSSParserTokenRange& range, const MediaQueryParserContext& context, State& state)
{
auto feature = FeatureParser::consumeFeature(range, context);
if (!feature)
return { };
if (!validateFeature(*feature, context, state))
return { };
return feature;
}
template<typename ConcreteParser>
bool GenericMediaQueryParser<ConcreteParser>::validateFeature(Feature& feature, const MediaQueryParserContext& context, State& state)
{
auto* schema = ConcreteParser::schemaForFeatureName(feature.name, context, state);
if (!schema)
return false;
return FeatureParser::validateFeatureAgainstSchema(feature, *schema);
}
template<typename ConcreteParser>
const FeatureSchema* GenericMediaQueryParser<ConcreteParser>::schemaForFeatureName(const AtomString& name, const MediaQueryParserContext&, State&)
{
using SchemaMap = MemoryCompactLookupOnlyRobinHoodHashMap<AtomString, const FeatureSchema*>;
static NeverDestroyed<SchemaMap> schemas = [&] {
SchemaMap map;
for (auto& entry : ConcreteParser::featureSchemas())
map.add(entry->name, entry);
return map;
}();
return schemas->get(name);
}
}
}
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