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// Copyright 2015 The Chromium Authors. All rights reserved.
// Copyright (C) 2016-2020 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 "CSSVariableData.h"
#include "ConstantPropertyMap.h"
#include "RenderStyle.h"
#include "StyleBuilder.h"
#include "StyleResolver.h"
namespace WebCore {
static bool resolveTokenRange(CSSParserTokenRange, Vector<CSSParserToken>&, Style::BuilderState&);
CSSVariableReferenceValue::CSSVariableReferenceValue(Ref<CSSVariableData>&& data)
: CSSValue(VariableReferenceClass)
, m_data(WTFMove(data))
{
}
Ref<CSSVariableReferenceValue> CSSVariableReferenceValue::create(const CSSParserTokenRange& range)
{
return adoptRef(*new CSSVariableReferenceValue(CSSVariableData::create(range)));
}
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;
}
static bool resolveVariableFallback(CSSParserTokenRange range, Vector<CSSParserToken>& result, Style::BuilderState& builderState)
{
if (range.atEnd())
return false;
ASSERT(range.peek().type() == CommaToken);
range.consume();
return resolveTokenRange(range, result, builderState);
}
static bool resolveVariableReference(CSSParserTokenRange range, CSSValueID functionId, Vector<CSSParserToken>& result, Style::BuilderState& builderState)
{
ASSERT(functionId == CSSValueVar || functionId == CSSValueEnv);
auto& registeredProperties = builderState.document().getCSSRegisteredCustomPropertySet();
auto& style = builderState.style();
range.consumeWhitespace();
ASSERT(range.peek().type() == IdentToken);
String variableName = range.consumeIncludingWhitespace().value().toString();
ASSERT(range.atEnd() || (range.peek().type() == CommaToken));
// Apply this variable first, in case it is still unresolved
builderState.builder().applyCustomProperty(variableName);
// Apply fallback to detect cycles
Vector<CSSParserToken> fallbackResult;
bool fallbackReturn = resolveVariableFallback(CSSParserTokenRange(range), fallbackResult, builderState);
auto* property = functionId == CSSValueVar
? style.getCustomProperty(variableName)
: builderState.document().constantProperties().values().get(variableName);
if (!property || property->isUnset()) {
auto* registered = registeredProperties.get(variableName);
if (registered && registered->initialValue())
property = registered->initialValue();
}
if (!property || property->isInvalid()) {
if (fallbackReturn)
result.appendVector(fallbackResult);
return fallbackReturn;
}
ASSERT(property->isResolved());
result.appendVector(property->tokens());
return true;
}
static bool resolveTokenRange(CSSParserTokenRange range, Vector<CSSParserToken>& result, Style::BuilderState& builderState)
{
bool success = true;
while (!range.atEnd()) {
auto functionId = range.peek().functionId();
if (functionId == CSSValueVar || functionId == CSSValueEnv)
success &= resolveVariableReference(range.consumeBlock(), functionId, result, builderState);
else
result.append(range.consume());
}
return success;
}
RefPtr<CSSVariableData> CSSVariableReferenceValue::resolveVariableReferences(Style::BuilderState& builderState) const
{
Vector<CSSParserToken> resolvedTokens;
if (!resolveTokenRange(m_data->tokenRange(), resolvedTokens, builderState))
return nullptr;
return CSSVariableData::create(resolvedTokens);
}
} // namespace WebCore