144 lines
5.4 KiB
C++
144 lines
5.4 KiB
C++
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Copyright (C) 2016-2020 Apple Inc. All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "config.h"
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#include "CSSVariableReferenceValue.h"
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#include "CSSVariableData.h"
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#include "ConstantPropertyMap.h"
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#include "RenderStyle.h"
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#include "StyleBuilder.h"
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#include "StyleResolver.h"
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namespace WebCore {
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static bool resolveTokenRange(CSSParserTokenRange, Vector<CSSParserToken>&, Style::BuilderState&);
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CSSVariableReferenceValue::CSSVariableReferenceValue(Ref<CSSVariableData>&& data)
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: CSSValue(VariableReferenceClass)
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, m_data(WTFMove(data))
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{
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}
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Ref<CSSVariableReferenceValue> CSSVariableReferenceValue::create(const CSSParserTokenRange& range)
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{
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return adoptRef(*new CSSVariableReferenceValue(CSSVariableData::create(range)));
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}
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bool CSSVariableReferenceValue::equals(const CSSVariableReferenceValue& other) const
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{
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return m_data.get() == other.m_data.get();
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}
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String CSSVariableReferenceValue::customCSSText() const
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{
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if (m_stringValue.isNull())
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m_stringValue = m_data->tokenRange().serialize();
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return m_stringValue;
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}
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static bool resolveVariableFallback(CSSParserTokenRange range, Vector<CSSParserToken>& result, Style::BuilderState& builderState)
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{
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if (range.atEnd())
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return false;
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ASSERT(range.peek().type() == CommaToken);
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range.consumeIncludingWhitespace();
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return resolveTokenRange(range, result, builderState);
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}
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static bool resolveVariableReference(CSSParserTokenRange range, CSSValueID functionId, Vector<CSSParserToken>& result, Style::BuilderState& builderState)
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{
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ASSERT(functionId == CSSValueVar || functionId == CSSValueEnv);
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auto& registeredProperties = builderState.document().getCSSRegisteredCustomPropertySet();
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auto& style = builderState.style();
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range.consumeWhitespace();
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ASSERT(range.peek().type() == IdentToken);
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String variableName = range.consumeIncludingWhitespace().value().toString();
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ASSERT(range.atEnd() || (range.peek().type() == CommaToken));
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// Apply this variable first, in case it is still unresolved
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builderState.builder().applyCustomProperty(variableName);
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// Apply fallback to detect cycles
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Vector<CSSParserToken> fallbackResult;
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bool fallbackReturn = resolveVariableFallback(CSSParserTokenRange(range), fallbackResult, builderState);
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auto* property = functionId == CSSValueVar
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? style.getCustomProperty(variableName)
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: builderState.document().constantProperties().values().get(variableName);
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if (!property || property->isUnset()) {
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auto* registered = registeredProperties.get(variableName);
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if (registered && registered->initialValue())
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property = registered->initialValue();
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}
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if (!property || property->isInvalid()) {
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if (fallbackResult.size() > CSSVariableReferenceValue::maxSubstitutionTokens)
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return false;
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if (fallbackReturn)
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result.appendVector(fallbackResult);
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return fallbackReturn;
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}
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ASSERT(property->isResolved());
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if (property->tokens().size() > CSSVariableReferenceValue::maxSubstitutionTokens)
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return false;
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result.appendVector(property->tokens());
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return true;
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}
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static bool resolveTokenRange(CSSParserTokenRange range, Vector<CSSParserToken>& result, Style::BuilderState& builderState)
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{
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bool success = true;
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while (!range.atEnd()) {
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auto functionId = range.peek().functionId();
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if (functionId == CSSValueVar || functionId == CSSValueEnv)
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success &= resolveVariableReference(range.consumeBlock(), functionId, result, builderState);
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else
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result.append(range.consume());
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}
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return success;
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}
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RefPtr<CSSVariableData> CSSVariableReferenceValue::resolveVariableReferences(Style::BuilderState& builderState) const
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{
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Vector<CSSParserToken> resolvedTokens;
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if (!resolveTokenRange(m_data->tokenRange(), resolvedTokens, builderState))
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return nullptr;
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return CSSVariableData::create(resolvedTokens);
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}
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} // namespace WebCore
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