338 lines
12 KiB
C++
338 lines
12 KiB
C++
/*
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* Copyright (C) 2017 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
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* are met:
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* 1. 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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "CSSStyleDeclaration.h"
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#include "CSSPropertyNames.h"
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#include "CSSPropertyParser.h"
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#include "DeprecatedGlobalSettings.h"
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#include "Document.h"
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#include "HashTools.h"
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#include "Settings.h"
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#include "StyledElement.h"
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#include <wtf/IsoMallocInlines.h>
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#include <wtf/Variant.h>
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#include <wtf/text/StringParsingBuffer.h>
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namespace WebCore {
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WTF_MAKE_ISO_ALLOCATED_IMPL(CSSStyleDeclaration);
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namespace {
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enum class PropertyNamePrefix { None, Epub, WebKit };
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template<size_t prefixCStringLength>
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static inline bool matchesCSSPropertyNamePrefix(const StringImpl& propertyName, const char (&prefix)[prefixCStringLength])
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{
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size_t prefixLength = prefixCStringLength - 1;
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ASSERT(toASCIILower(propertyName[0]) == prefix[0]);
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const size_t offset = 1;
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#ifndef NDEBUG
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for (size_t i = 0; i < prefixLength; ++i)
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ASSERT(isASCIILower(prefix[i]));
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ASSERT(!prefix[prefixLength]);
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ASSERT(propertyName.length());
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#endif
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// The prefix within the property name must be followed by a capital letter.
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// Other characters in the prefix within the property name must be lowercase.
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if (propertyName.length() < prefixLength + 1)
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return false;
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for (size_t i = offset; i < prefixLength; ++i) {
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if (propertyName[i] != prefix[i])
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return false;
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}
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if (!isASCIIUpper(propertyName[prefixLength]))
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return false;
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return true;
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}
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static PropertyNamePrefix propertyNamePrefix(const StringImpl& propertyName)
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{
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ASSERT(propertyName.length());
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// First character of the prefix within the property name may be upper or lowercase.
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UChar firstChar = toASCIILower(propertyName[0]);
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switch (firstChar) {
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case 'e':
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if (matchesCSSPropertyNamePrefix(propertyName, "epub"))
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return PropertyNamePrefix::Epub;
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break;
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case 'w':
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if (matchesCSSPropertyNamePrefix(propertyName, "webkit"))
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return PropertyNamePrefix::WebKit;
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break;
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default:
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break;
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}
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return PropertyNamePrefix::None;
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}
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static inline void writeWebKitPrefix(char*& buffer)
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{
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*buffer++ = '-';
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*buffer++ = 'w';
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*buffer++ = 'e';
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*buffer++ = 'b';
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*buffer++ = 'k';
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*buffer++ = 'i';
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*buffer++ = 't';
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*buffer++ = '-';
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}
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static inline void writeEpubPrefix(char*& buffer)
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{
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*buffer++ = '-';
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*buffer++ = 'e';
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*buffer++ = 'p';
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*buffer++ = 'u';
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*buffer++ = 'b';
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*buffer++ = '-';
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}
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static CSSPropertyID parseJavaScriptCSSPropertyName(const AtomString& propertyName)
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{
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using CSSPropertyIDMap = HashMap<String, CSSPropertyID>;
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static NeverDestroyed<CSSPropertyIDMap> propertyIDCache;
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auto* propertyNameString = propertyName.impl();
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if (!propertyNameString)
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return CSSPropertyInvalid;
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unsigned length = propertyNameString->length();
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if (!length)
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return CSSPropertyInvalid;
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if (auto id = propertyIDCache.get().get(propertyNameString))
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return id;
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constexpr size_t bufferSize = maxCSSPropertyNameLength + 1;
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char buffer[bufferSize];
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char* bufferPtr = buffer;
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const char* name = bufferPtr;
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unsigned i = 0;
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switch (propertyNamePrefix(*propertyNameString)) {
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case PropertyNamePrefix::None:
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if (isASCIIUpper((*propertyNameString)[0]))
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return CSSPropertyInvalid;
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break;
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case PropertyNamePrefix::Epub:
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writeEpubPrefix(bufferPtr);
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i += 4;
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break;
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case PropertyNamePrefix::WebKit:
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writeWebKitPrefix(bufferPtr);
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i += 6;
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break;
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}
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*bufferPtr++ = toASCIILower((*propertyNameString)[i++]);
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char* bufferEnd = buffer + bufferSize;
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char* stringEnd = bufferEnd - 1;
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size_t bufferSizeLeft = stringEnd - bufferPtr;
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size_t propertySizeLeft = length - i;
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if (propertySizeLeft > bufferSizeLeft)
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return CSSPropertyInvalid;
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for (; i < length; ++i) {
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UChar c = (*propertyNameString)[i];
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if (!c || !isASCII(c))
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return CSSPropertyInvalid; // illegal character
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if (isASCIIUpper(c)) {
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size_t bufferSizeLeft = stringEnd - bufferPtr;
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size_t propertySizeLeft = length - i + 1;
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if (propertySizeLeft > bufferSizeLeft)
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return CSSPropertyInvalid;
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*bufferPtr++ = '-';
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*bufferPtr++ = toASCIILowerUnchecked(c);
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} else
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*bufferPtr++ = c;
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ASSERT_WITH_SECURITY_IMPLICATION(bufferPtr < bufferEnd);
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}
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ASSERT_WITH_SECURITY_IMPLICATION(bufferPtr < bufferEnd);
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*bufferPtr = '\0';
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unsigned outputLength = bufferPtr - buffer;
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auto hashTableEntry = findProperty(name, outputLength);
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if (!hashTableEntry)
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return CSSPropertyInvalid;
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auto id = static_cast<CSSPropertyID>(hashTableEntry->id);
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if (!id)
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return CSSPropertyInvalid;
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propertyIDCache.get().add(propertyNameString, id);
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return id;
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}
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static CSSPropertyID propertyIDFromJavaScriptCSSPropertyName(const AtomString& propertyName, const Settings* settings)
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{
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auto id = parseJavaScriptCSSPropertyName(propertyName);
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if (!isEnabledCSSProperty(id) || !isCSSPropertyEnabledBySettings(id, settings))
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return CSSPropertyInvalid;
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return id;
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}
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}
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CSSPropertyID CSSStyleDeclaration::getCSSPropertyIDFromJavaScriptPropertyName(const AtomString& propertyName)
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{
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// FIXME: This is going to return incorrect results for css properties disabled by Settings.
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return propertyIDFromJavaScriptCSSPropertyName(propertyName, nullptr);
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}
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const Settings* CSSStyleDeclaration::settings() const
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{
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return parentElement() ? &parentElement()->document().settings() : nullptr;
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}
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enum class CSSPropertyLookupMode { ConvertUsingDashPrefix, ConvertUsingNoDashPrefix, NoConversion };
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template<CSSPropertyLookupMode mode> static CSSPropertyID lookupCSSPropertyFromIDLAttribute(const AtomString& attribute)
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{
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static NeverDestroyed<HashMap<AtomString, CSSPropertyID>> cache;
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if (auto id = cache.get().get(attribute))
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return id;
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char outputBuffer[maxCSSPropertyNameLength + 1];
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char* outputBufferCurrent = outputBuffer;
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const char* outputBufferStart = outputBufferCurrent;
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if constexpr (mode == CSSPropertyLookupMode::ConvertUsingDashPrefix || mode == CSSPropertyLookupMode::ConvertUsingNoDashPrefix) {
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// Conversion is implementing the "IDL attribute to CSS property algorithm"
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// from https://drafts.csswg.org/cssom/#idl-attribute-to-css-property.
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if constexpr (mode == CSSPropertyLookupMode::ConvertUsingDashPrefix)
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*outputBufferCurrent++ = '-';
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readCharactersForParsing(attribute, [&](auto buffer) {
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while (buffer.hasCharactersRemaining()) {
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auto c = *buffer++;
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ASSERT_WITH_MESSAGE(isASCII(c), "Invalid property name: %s", attribute.string().utf8().data());
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if (isASCIIUpper(c)) {
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*outputBufferCurrent++ = '-';
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*outputBufferCurrent++ = toASCIILowerUnchecked(c);
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} else
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*outputBufferCurrent++ = c;
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}
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});
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*outputBufferCurrent = '\0';
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} else {
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readCharactersForParsing(attribute, [&](auto buffer) {
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while (buffer.hasCharactersRemaining()) {
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auto c = *buffer++;
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ASSERT_WITH_MESSAGE(c == '-' || isASCIILower(c), "Invalid property name: %s", attribute.string().utf8().data());
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*outputBufferCurrent++ = c;
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}
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});
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*outputBufferCurrent = '\0';
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}
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auto hashTableEntry = findProperty(outputBufferStart, outputBufferCurrent - outputBuffer);
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ASSERT_WITH_MESSAGE(hashTableEntry, "Invalid property name: %s", attribute.string().utf8().data());
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auto id = static_cast<CSSPropertyID>(hashTableEntry->id);
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cache.get().add(attribute, id);
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return id;
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}
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String CSSStyleDeclaration::propertyValueForCamelCasedIDLAttribute(const AtomString& attribute)
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{
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auto propertyID = lookupCSSPropertyFromIDLAttribute<CSSPropertyLookupMode::ConvertUsingNoDashPrefix>(attribute);
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ASSERT_WITH_MESSAGE(propertyID != CSSPropertyInvalid, "Invalid attribute: %s", attribute.string().utf8().data());
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return getPropertyValueInternal(propertyID);
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}
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ExceptionOr<void> CSSStyleDeclaration::setPropertyValueForCamelCasedIDLAttribute(const AtomString& attribute, const String& value)
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{
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auto propertyID = lookupCSSPropertyFromIDLAttribute<CSSPropertyLookupMode::ConvertUsingNoDashPrefix>(attribute);
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ASSERT_WITH_MESSAGE(propertyID != CSSPropertyInvalid, "Invalid attribute: %s", attribute.string().utf8().data());
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return setPropertyInternal(propertyID, value, false);
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}
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String CSSStyleDeclaration::propertyValueForWebKitCasedIDLAttribute(const AtomString& attribute)
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{
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auto propertyID = lookupCSSPropertyFromIDLAttribute<CSSPropertyLookupMode::ConvertUsingDashPrefix>(attribute);
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ASSERT_WITH_MESSAGE(propertyID != CSSPropertyInvalid, "Invalid attribute: %s", attribute.string().utf8().data());
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return getPropertyValueInternal(propertyID);
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}
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ExceptionOr<void> CSSStyleDeclaration::setPropertyValueForWebKitCasedIDLAttribute(const AtomString& attribute, const String& value)
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{
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auto propertyID = lookupCSSPropertyFromIDLAttribute<CSSPropertyLookupMode::ConvertUsingDashPrefix>(attribute);
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ASSERT_WITH_MESSAGE(propertyID != CSSPropertyInvalid, "Invalid attribute: %s", attribute.string().utf8().data());
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return setPropertyInternal(propertyID, value, false);
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}
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String CSSStyleDeclaration::propertyValueForDashedIDLAttribute(const AtomString& attribute)
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{
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auto propertyID = lookupCSSPropertyFromIDLAttribute<CSSPropertyLookupMode::NoConversion>(attribute);
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ASSERT_WITH_MESSAGE(propertyID != CSSPropertyInvalid, "Invalid attribute: %s", attribute.string().utf8().data());
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return getPropertyValueInternal(propertyID);
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}
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ExceptionOr<void> CSSStyleDeclaration::setPropertyValueForDashedIDLAttribute(const AtomString& attribute, const String& value)
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{
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auto propertyID = lookupCSSPropertyFromIDLAttribute<CSSPropertyLookupMode::NoConversion>(attribute);
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ASSERT_WITH_MESSAGE(propertyID != CSSPropertyInvalid, "Invalid attribute: %s", attribute.string().utf8().data());
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return setPropertyInternal(propertyID, value, false);
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}
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String CSSStyleDeclaration::propertyValueForEpubCasedIDLAttribute(const AtomString& attribute)
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{
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auto propertyID = lookupCSSPropertyFromIDLAttribute<CSSPropertyLookupMode::ConvertUsingDashPrefix>(attribute);
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ASSERT_WITH_MESSAGE(propertyID != CSSPropertyInvalid, "Invalid attribute: %s", attribute.string().utf8().data());
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return getPropertyValueInternal(propertyID);
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}
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ExceptionOr<void> CSSStyleDeclaration::setPropertyValueForEpubCasedIDLAttribute(const AtomString& attribute, const String& value)
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{
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auto propertyID = lookupCSSPropertyFromIDLAttribute<CSSPropertyLookupMode::ConvertUsingDashPrefix>(attribute);
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ASSERT_WITH_MESSAGE(propertyID != CSSPropertyInvalid, "Invalid attribute: %s", attribute.string().utf8().data());
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return setPropertyInternal(propertyID, value, false);
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}
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String CSSStyleDeclaration::cssFloat()
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{
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return getPropertyValueInternal(CSSPropertyFloat);
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}
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ExceptionOr<void> CSSStyleDeclaration::setCssFloat(const String& value)
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{
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return setPropertyInternal(CSSPropertyFloat, value, false /* important */);
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}
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}
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