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// Copyright 2015 The Chromium Authors. All rights reserved.
// Copyright (C) 2016-2021 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 "CSSVariableReferenceValue.h"
#include "CSSCustomPropertyValue.h"
#include "CSSParserTokenRange.h"
#include "CSSPropertyParser.h"
#include "CSSRegisteredCustomProperty.h"
#include "CSSVariableData.h"
#include "ConstantPropertyMap.h"
#include "CustomPropertyRegistry.h"
#include "Document.h"
#include "RenderStyle.h"
#include "StyleBuilder.h"
#include "StyleResolver.h"
namespace WebCore {
CSSVariableReferenceValue::CSSVariableReferenceValue(Ref<CSSVariableData>&& data, const CSSParserContext& context)
: CSSValue(VariableReferenceClass)
, m_data(WTFMove(data))
, m_context(context)
{
}
Ref<CSSVariableReferenceValue> CSSVariableReferenceValue::create(const CSSParserTokenRange& range, const CSSParserContext& context)
{
return adoptRef(*new CSSVariableReferenceValue(CSSVariableData::create(range), context));
}
Ref<CSSVariableReferenceValue> CSSVariableReferenceValue::create(Ref<CSSVariableData>&& data, const CSSParserContext& context)
{
return adoptRef(*new CSSVariableReferenceValue(WTFMove(data), context));
}
bool CSSVariableReferenceValue::equals(const CSSVariableReferenceValue& other) const
{
return m_data.get() == other.m_data.get();
}
String CSSVariableReferenceValue::customCSSText() const
{
if (m_stringValue.isNull())
m_stringValue = m_data->tokenRange().serialize();
return m_stringValue;
}
auto CSSVariableReferenceValue::resolveVariableFallback(const AtomString& variableName, CSSParserTokenRange range, CSSValueID functionId, Style::BuilderState& builderState) const -> std::pair<FallbackResult, Vector<CSSParserToken>>
{
ASSERT(range.atEnd() || range.peek().type() == CommaToken);
if (range.atEnd())
return { FallbackResult::None, { } };
range.consumeIncludingWhitespace();
auto tokens = resolveTokenRange(range, builderState);
if (functionId == CSSValueVar) {
auto* registered = builderState.document().customPropertyRegistry().get(variableName);
if (registered && !registered->syntax.isUniversal()) {
// https://drafts.css-houdini.org/css-properties-values-api/#fallbacks-in-var-references
// The fallback value must match the syntax definition of the custom property being referenced,
// otherwise the declaration is invalid at computed-value time
if (!tokens || !CSSPropertyParser::isValidCustomPropertyValueForSyntax(registered->syntax, *tokens, m_context))
return { FallbackResult::Invalid, { } };
return { FallbackResult::Valid, WTFMove(*tokens) };
}
}
if (!tokens)
return { FallbackResult::None, { } };
return { FallbackResult::Valid, WTFMove(*tokens) };
}
bool CSSVariableReferenceValue::resolveVariableReference(CSSParserTokenRange range, CSSValueID functionId, Vector<CSSParserToken>& tokens, Style::BuilderState& builderState) const
{
ASSERT(functionId == CSSValueVar || functionId == CSSValueEnv);
range.consumeWhitespace();
ASSERT(range.peek().type() == IdentToken);
auto variableName = range.consumeIncludingWhitespace().value().toAtomString();
// Apply this variable first, in case it is still unresolved
builderState.builder().applyCustomProperty(variableName);
// Fallback has to be resolved even when not used to detect cycles and invalid syntax.
auto [fallbackResult, fallbackTokens] = resolveVariableFallback(variableName, range, functionId, builderState);
if (fallbackResult == FallbackResult::Invalid)
return false;
auto* property = [&]() -> const CSSCustomPropertyValue* {
if (functionId == CSSValueEnv)
return builderState.document().constantProperties().values().get(variableName);
return builderState.style().customPropertyValue(variableName);
}();
if (!property || property->isInvalid()) {
if (fallbackTokens.size() > maxSubstitutionTokens)
return false;
if (fallbackResult == FallbackResult::Valid) {
tokens.appendVector(fallbackTokens);
return true;
}
return false;
}
ASSERT(property->isResolved());
if (property->tokens().size() > maxSubstitutionTokens)
return false;
tokens.appendVector(property->tokens());
return true;
}
std::optional<Vector<CSSParserToken>> CSSVariableReferenceValue::resolveTokenRange(CSSParserTokenRange range, Style::BuilderState& builderState) const
{
Vector<CSSParserToken> tokens;
bool success = true;
while (!range.atEnd()) {
auto functionId = range.peek().functionId();
if (functionId == CSSValueVar || functionId == CSSValueEnv) {
if (!resolveVariableReference(range.consumeBlock(), functionId, tokens, builderState))
success = false;
continue;
}
tokens.append(range.consume());
}
if (!success)
return { };
return tokens;
}
RefPtr<CSSVariableData> CSSVariableReferenceValue::resolveVariableReferences(Style::BuilderState& builderState) const
{
auto resolvedTokens = resolveTokenRange(m_data->tokenRange(), builderState);
if (!resolvedTokens)
return nullptr;
return CSSVariableData::create(*resolvedTokens);
}
} // namespace WebCore
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