Source/WebCore/css/CSSStyleDeclaration.cpp - WebKit - Git at Google

 /*
  * Copyright (C) 2017 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. AND ITS 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 APPLE INC. OR ITS 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 "CSSStyleDeclaration.h"

 #include "CSSPropertyNames.h"
 #include "CSSPropertyParser.h"
 #include "DeprecatedGlobalSettings.h"
 #include "Document.h"
 #include "HashTools.h"
 #include "Settings.h"
 #include "StyledElement.h"
 #include <variant>
 #include <wtf/IsoMallocInlines.h>
 #include <wtf/text/StringParsingBuffer.h>

 namespace WebCore {

 WTF_MAKE_ISO_ALLOCATED_IMPL(CSSStyleDeclaration);

 namespace {

 enum class PropertyNamePrefix { None, Epub, WebKit };

 template<size_t prefixCStringLength>
 static inline bool matchesCSSPropertyNamePrefix(const StringImpl& propertyName, const char (&prefix)[prefixCStringLength])
 {
     size_t prefixLength = prefixCStringLength - 1;

     ASSERT(toASCIILower(propertyName[0]) == prefix[0]);
     const size_t offset = 1;

 #ifndef NDEBUG
     for (size_t i = 0; i < prefixLength; ++i)
         ASSERT(isASCIILower(prefix[i]));
     ASSERT(!prefix[prefixLength]);
     ASSERT(propertyName.length());
 #endif

     // The prefix within the property name must be followed by a capital letter.
     // Other characters in the prefix within the property name must be lowercase.
     if (propertyName.length() < prefixLength + 1)
         return false;

     for (size_t i = offset; i < prefixLength; ++i) {
         if (propertyName[i] != prefix[i])
             return false;
     }

     if (!isASCIIUpper(propertyName[prefixLength]))
         return false;

     return true;
 }

 static PropertyNamePrefix propertyNamePrefix(const StringImpl& propertyName)
 {
     ASSERT(propertyName.length());

     // First character of the prefix within the property name may be upper or lowercase.
     UChar firstChar = toASCIILower(propertyName[0]);
     switch (firstChar) {
     case 'e':
         if (matchesCSSPropertyNamePrefix(propertyName, "epub"))
             return PropertyNamePrefix::Epub;
         break;
     case 'w':
         if (matchesCSSPropertyNamePrefix(propertyName, "webkit"))
             return PropertyNamePrefix::WebKit;
         break;
     default:
         break;
     }
     return PropertyNamePrefix::None;
 }

 static inline void writeWebKitPrefix(char*& buffer)
 {
     *buffer++ = '-';
     *buffer++ = 'w';
     *buffer++ = 'e';
     *buffer++ = 'b';
     *buffer++ = 'k';
     *buffer++ = 'i';
     *buffer++ = 't';
     *buffer++ = '-';
 }

 static inline void writeEpubPrefix(char*& buffer)
 {
     *buffer++ = '-';
     *buffer++ = 'e';
     *buffer++ = 'p';
     *buffer++ = 'u';
     *buffer++ = 'b';
     *buffer++ = '-';
 }

 static CSSPropertyID parseJavaScriptCSSPropertyName(const AtomString& propertyName)
 {
     using CSSPropertyIDMap = HashMap<String, CSSPropertyID>;
     static NeverDestroyed<CSSPropertyIDMap> propertyIDCache;

     auto* propertyNameString = propertyName.impl();
     if (!propertyNameString)
         return CSSPropertyInvalid;

     unsigned length = propertyNameString->length();
     if (!length)
         return CSSPropertyInvalid;

     if (auto id = propertyIDCache.get().get(propertyNameString))
         return id;

     constexpr size_t bufferSize = maxCSSPropertyNameLength + 1;
     char buffer[bufferSize];
     char* bufferPtr = buffer;
     const char* name = bufferPtr;

     unsigned i = 0;
     switch (propertyNamePrefix(*propertyNameString)) {
     case PropertyNamePrefix::None:
         if (isASCIIUpper((*propertyNameString)[0]))
             return CSSPropertyInvalid;
         break;
     case PropertyNamePrefix::Epub:
         writeEpubPrefix(bufferPtr);
         i += 4;
         break;
     case PropertyNamePrefix::WebKit:
         writeWebKitPrefix(bufferPtr);
         i += 6;
         break;
     }

     *bufferPtr++ = toASCIILower((*propertyNameString)[i++]);

     char* bufferEnd = buffer + bufferSize;
     char* stringEnd = bufferEnd - 1;
     size_t bufferSizeLeft = stringEnd - bufferPtr;
     size_t propertySizeLeft = length - i;
     if (propertySizeLeft > bufferSizeLeft)
         return CSSPropertyInvalid;

     for (; i < length; ++i) {
         UChar c = (*propertyNameString)[i];
         if (!c || !isASCII(c))
             return CSSPropertyInvalid; // illegal character
         if (isASCIIUpper(c)) {
             size_t bufferSizeLeft = stringEnd - bufferPtr;
             size_t propertySizeLeft = length - i + 1;
             if (propertySizeLeft > bufferSizeLeft)
                 return CSSPropertyInvalid;
             *bufferPtr++ = '-';
             *bufferPtr++ = toASCIILowerUnchecked(c);
         } else
             *bufferPtr++ = c;
         ASSERT_WITH_SECURITY_IMPLICATION(bufferPtr < bufferEnd);
     }
     ASSERT_WITH_SECURITY_IMPLICATION(bufferPtr < bufferEnd);
     *bufferPtr = '\0';

     unsigned outputLength = bufferPtr - buffer;
     auto hashTableEntry = findProperty(name, outputLength);
     if (!hashTableEntry)
         return CSSPropertyInvalid;

     auto id = static_cast<CSSPropertyID>(hashTableEntry->id);
     if (!id)
         return CSSPropertyInvalid;

     propertyIDCache.get().add(propertyNameString, id);
     return id;
 }

 static CSSPropertyID propertyIDFromJavaScriptCSSPropertyName(const AtomString& propertyName, const Settings* settings)
 {
     auto id = parseJavaScriptCSSPropertyName(propertyName);
     if (!isEnabledCSSProperty(id) || !isCSSPropertyEnabledBySettings(id, settings))
         return CSSPropertyInvalid;
     return id;
 }

 }

 CSSPropertyID CSSStyleDeclaration::getCSSPropertyIDFromJavaScriptPropertyName(const AtomString& propertyName)
 {
     // FIXME: This is going to return incorrect results for css properties disabled by Settings.
     return propertyIDFromJavaScriptCSSPropertyName(propertyName, nullptr);
 }

 const Settings* CSSStyleDeclaration::settings() const
 {
     return parentElement() ? &parentElement()->document().settings() : nullptr;
 }

 enum class CSSPropertyLookupMode { ConvertUsingDashPrefix, ConvertUsingNoDashPrefix, NoConversion };

 template<CSSPropertyLookupMode mode> static CSSPropertyID lookupCSSPropertyFromIDLAttribute(const AtomString& attribute)
 {
     static NeverDestroyed<HashMap<AtomString, CSSPropertyID>> cache;

     if (auto id = cache.get().get(attribute))
         return id;

     char outputBuffer[maxCSSPropertyNameLength + 1];
     char* outputBufferCurrent = outputBuffer;
     const char* outputBufferStart = outputBufferCurrent;

     if constexpr (mode == CSSPropertyLookupMode::ConvertUsingDashPrefix || mode == CSSPropertyLookupMode::ConvertUsingNoDashPrefix) {
         // Conversion is implementing the "IDL attribute to CSS property algorithm"
         // from https://drafts.csswg.org/cssom/#idl-attribute-to-css-property.

         if constexpr (mode == CSSPropertyLookupMode::ConvertUsingDashPrefix)
             *outputBufferCurrent++ = '-';

         readCharactersForParsing(attribute, [&](auto buffer) {
             while (buffer.hasCharactersRemaining()) {
                 auto c = *buffer++;
                 ASSERT_WITH_MESSAGE(isASCII(c), "Invalid property name: %s", attribute.string().utf8().data());
                 if (isASCIIUpper(c)) {
                     *outputBufferCurrent++ = '-';
                     *outputBufferCurrent++ = toASCIILowerUnchecked(c);
                 } else
                     *outputBufferCurrent++ = c;
             }
         });
         *outputBufferCurrent = '\0';
     } else {
         readCharactersForParsing(attribute, [&](auto buffer) {
             while (buffer.hasCharactersRemaining()) {
                 auto c = *buffer++;
                 ASSERT_WITH_MESSAGE(c == '-' || isASCIILower(c), "Invalid property name: %s", attribute.string().utf8().data());
                 *outputBufferCurrent++ = c;
             }
         });
         *outputBufferCurrent = '\0';
     }

     auto hashTableEntry = findProperty(outputBufferStart, outputBufferCurrent - outputBuffer);
     ASSERT_WITH_MESSAGE(hashTableEntry, "Invalid property name: %s", attribute.string().utf8().data());

     auto id = static_cast<CSSPropertyID>(hashTableEntry->id);
     cache.get().add(attribute, id);
     return id;
 }

 String CSSStyleDeclaration::propertyValueForCamelCasedIDLAttribute(const AtomString& attribute)
 {
     auto propertyID = lookupCSSPropertyFromIDLAttribute<CSSPropertyLookupMode::ConvertUsingNoDashPrefix>(attribute);
     ASSERT_WITH_MESSAGE(propertyID != CSSPropertyInvalid, "Invalid attribute: %s", attribute.string().utf8().data());
     return getPropertyValueInternal(propertyID);
 }

 ExceptionOr<void> CSSStyleDeclaration::setPropertyValueForCamelCasedIDLAttribute(const AtomString& attribute, const String& value)
 {
     auto propertyID = lookupCSSPropertyFromIDLAttribute<CSSPropertyLookupMode::ConvertUsingNoDashPrefix>(attribute);
     ASSERT_WITH_MESSAGE(propertyID != CSSPropertyInvalid, "Invalid attribute: %s", attribute.string().utf8().data());
     return setPropertyInternal(propertyID, value, false);
 }

 String CSSStyleDeclaration::propertyValueForWebKitCasedIDLAttribute(const AtomString& attribute)
 {
     auto propertyID = lookupCSSPropertyFromIDLAttribute<CSSPropertyLookupMode::ConvertUsingDashPrefix>(attribute);
     ASSERT_WITH_MESSAGE(propertyID != CSSPropertyInvalid, "Invalid attribute: %s", attribute.string().utf8().data());
     return getPropertyValueInternal(propertyID);
 }

 ExceptionOr<void> CSSStyleDeclaration::setPropertyValueForWebKitCasedIDLAttribute(const AtomString& attribute, const String& value)
 {
     auto propertyID = lookupCSSPropertyFromIDLAttribute<CSSPropertyLookupMode::ConvertUsingDashPrefix>(attribute);
     ASSERT_WITH_MESSAGE(propertyID != CSSPropertyInvalid, "Invalid attribute: %s", attribute.string().utf8().data());
     return setPropertyInternal(propertyID, value, false);
 }

 String CSSStyleDeclaration::propertyValueForDashedIDLAttribute(const AtomString& attribute)
 {
     auto propertyID = lookupCSSPropertyFromIDLAttribute<CSSPropertyLookupMode::NoConversion>(attribute);
     ASSERT_WITH_MESSAGE(propertyID != CSSPropertyInvalid, "Invalid attribute: %s", attribute.string().utf8().data());
     return getPropertyValueInternal(propertyID);
 }

 ExceptionOr<void> CSSStyleDeclaration::setPropertyValueForDashedIDLAttribute(const AtomString& attribute, const String& value)
 {
     auto propertyID = lookupCSSPropertyFromIDLAttribute<CSSPropertyLookupMode::NoConversion>(attribute);
     ASSERT_WITH_MESSAGE(propertyID != CSSPropertyInvalid, "Invalid attribute: %s", attribute.string().utf8().data());
     return setPropertyInternal(propertyID, value, false);
 }

 String CSSStyleDeclaration::propertyValueForEpubCasedIDLAttribute(const AtomString& attribute)
 {
     auto propertyID = lookupCSSPropertyFromIDLAttribute<CSSPropertyLookupMode::ConvertUsingDashPrefix>(attribute);
     ASSERT_WITH_MESSAGE(propertyID != CSSPropertyInvalid, "Invalid attribute: %s", attribute.string().utf8().data());
     return getPropertyValueInternal(propertyID);
 }

 ExceptionOr<void> CSSStyleDeclaration::setPropertyValueForEpubCasedIDLAttribute(const AtomString& attribute, const String& value)
 {
     auto propertyID = lookupCSSPropertyFromIDLAttribute<CSSPropertyLookupMode::ConvertUsingDashPrefix>(attribute);
     ASSERT_WITH_MESSAGE(propertyID != CSSPropertyInvalid, "Invalid attribute: %s", attribute.string().utf8().data());
     return setPropertyInternal(propertyID, value, false);
 }

 String CSSStyleDeclaration::cssFloat()
 {
     return getPropertyValueInternal(CSSPropertyFloat);
 }

 ExceptionOr<void> CSSStyleDeclaration::setCssFloat(const String& value)
 {
     return setPropertyInternal(CSSPropertyFloat, value, false /* important */);
 }

 }
	/*
	* Copyright (C) 2017 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. AND ITS 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 APPLE INC. OR ITS 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 "CSSStyleDeclaration.h"

	#include "CSSPropertyNames.h"
	#include "CSSPropertyParser.h"
	#include "DeprecatedGlobalSettings.h"
	#include "Document.h"
	#include "HashTools.h"
	#include "Settings.h"
	#include "StyledElement.h"
	#include <variant>
	#include <wtf/IsoMallocInlines.h>
	#include <wtf/text/StringParsingBuffer.h>

	namespace WebCore {

	WTF_MAKE_ISO_ALLOCATED_IMPL(CSSStyleDeclaration);

	namespace {

	enum class PropertyNamePrefix { None, Epub, WebKit };

	template<size_t prefixCStringLength>
	static inline bool matchesCSSPropertyNamePrefix(const StringImpl& propertyName, const char (&prefix)[prefixCStringLength])
	{
	size_t prefixLength = prefixCStringLength - 1;

	ASSERT(toASCIILower(propertyName[0]) == prefix[0]);
	const size_t offset = 1;

	#ifndef NDEBUG
	for (size_t i = 0; i < prefixLength; ++i)
	ASSERT(isASCIILower(prefix[i]));
	ASSERT(!prefix[prefixLength]);
	ASSERT(propertyName.length());
	#endif

	// The prefix within the property name must be followed by a capital letter.
	// Other characters in the prefix within the property name must be lowercase.
	if (propertyName.length() < prefixLength + 1)
	return false;

	for (size_t i = offset; i < prefixLength; ++i) {
	if (propertyName[i] != prefix[i])
	return false;
	}

	if (!isASCIIUpper(propertyName[prefixLength]))
	return false;

	return true;
	}

	static PropertyNamePrefix propertyNamePrefix(const StringImpl& propertyName)
	{
	ASSERT(propertyName.length());

	// First character of the prefix within the property name may be upper or lowercase.
	UChar firstChar = toASCIILower(propertyName[0]);
	switch (firstChar) {
	case 'e':
	if (matchesCSSPropertyNamePrefix(propertyName, "epub"))
	return PropertyNamePrefix::Epub;
	break;
	case 'w':
	if (matchesCSSPropertyNamePrefix(propertyName, "webkit"))
	return PropertyNamePrefix::WebKit;
	break;
	default:
	break;
	}
	return PropertyNamePrefix::None;
	}

	static inline void writeWebKitPrefix(char*& buffer)
	{
	*buffer++ = '-';
	*buffer++ = 'w';
	*buffer++ = 'e';
	*buffer++ = 'b';
	*buffer++ = 'k';
	*buffer++ = 'i';
	*buffer++ = 't';
	*buffer++ = '-';
	}

	static inline void writeEpubPrefix(char*& buffer)
	{
	*buffer++ = '-';
	*buffer++ = 'e';
	*buffer++ = 'p';
	*buffer++ = 'u';
	*buffer++ = 'b';
	*buffer++ = '-';
	}

	static CSSPropertyID parseJavaScriptCSSPropertyName(const AtomString& propertyName)
	{
	using CSSPropertyIDMap = HashMap<String, CSSPropertyID>;
	static NeverDestroyed<CSSPropertyIDMap> propertyIDCache;

	auto* propertyNameString = propertyName.impl();
	if (!propertyNameString)
	return CSSPropertyInvalid;

	unsigned length = propertyNameString->length();
	if (!length)
	return CSSPropertyInvalid;

	if (auto id = propertyIDCache.get().get(propertyNameString))
	return id;

	constexpr size_t bufferSize = maxCSSPropertyNameLength + 1;
	char buffer[bufferSize];
	char* bufferPtr = buffer;
	const char* name = bufferPtr;

	unsigned i = 0;
	switch (propertyNamePrefix(*propertyNameString)) {
	case PropertyNamePrefix::None:
	if (isASCIIUpper((*propertyNameString)[0]))
	return CSSPropertyInvalid;
	break;
	case PropertyNamePrefix::Epub:
	writeEpubPrefix(bufferPtr);
	i += 4;
	break;
	case PropertyNamePrefix::WebKit:
	writeWebKitPrefix(bufferPtr);
	i += 6;
	break;
	}

	bufferPtr++ = toASCIILower((propertyNameString)[i++]);

	char* bufferEnd = buffer + bufferSize;
	char* stringEnd = bufferEnd - 1;
	size_t bufferSizeLeft = stringEnd - bufferPtr;
	size_t propertySizeLeft = length - i;
	if (propertySizeLeft > bufferSizeLeft)
	return CSSPropertyInvalid;

	for (; i < length; ++i) {
	UChar c = (*propertyNameString)[i];
	if (!c \|\| !isASCII(c))
	return CSSPropertyInvalid; // illegal character
	if (isASCIIUpper(c)) {
	size_t bufferSizeLeft = stringEnd - bufferPtr;
	size_t propertySizeLeft = length - i + 1;
	if (propertySizeLeft > bufferSizeLeft)
	return CSSPropertyInvalid;
	*bufferPtr++ = '-';
	*bufferPtr++ = toASCIILowerUnchecked(c);
	} else
	*bufferPtr++ = c;
	ASSERT_WITH_SECURITY_IMPLICATION(bufferPtr < bufferEnd);
	}
	ASSERT_WITH_SECURITY_IMPLICATION(bufferPtr < bufferEnd);
	*bufferPtr = '\0';

	unsigned outputLength = bufferPtr - buffer;
	auto hashTableEntry = findProperty(name, outputLength);
	if (!hashTableEntry)
	return CSSPropertyInvalid;

	auto id = static_cast<CSSPropertyID>(hashTableEntry->id);
	if (!id)
	return CSSPropertyInvalid;

	propertyIDCache.get().add(propertyNameString, id);
	return id;
	}

	static CSSPropertyID propertyIDFromJavaScriptCSSPropertyName(const AtomString& propertyName, const Settings* settings)
	{
	auto id = parseJavaScriptCSSPropertyName(propertyName);
	if (!isEnabledCSSProperty(id) \|\| !isCSSPropertyEnabledBySettings(id, settings))
	return CSSPropertyInvalid;
	return id;
	}

	}

	CSSPropertyID CSSStyleDeclaration::getCSSPropertyIDFromJavaScriptPropertyName(const AtomString& propertyName)
	{
	// FIXME: This is going to return incorrect results for css properties disabled by Settings.
	return propertyIDFromJavaScriptCSSPropertyName(propertyName, nullptr);
	}

	const Settings* CSSStyleDeclaration::settings() const
	{
	return parentElement() ? &parentElement()->document().settings() : nullptr;
	}

	enum class CSSPropertyLookupMode { ConvertUsingDashPrefix, ConvertUsingNoDashPrefix, NoConversion };

	template<CSSPropertyLookupMode mode> static CSSPropertyID lookupCSSPropertyFromIDLAttribute(const AtomString& attribute)
	{
	static NeverDestroyed<HashMap<AtomString, CSSPropertyID>> cache;

	if (auto id = cache.get().get(attribute))
	return id;

	char outputBuffer[maxCSSPropertyNameLength + 1];
	char* outputBufferCurrent = outputBuffer;
	const char* outputBufferStart = outputBufferCurrent;

	if constexpr (mode == CSSPropertyLookupMode::ConvertUsingDashPrefix \|\| mode == CSSPropertyLookupMode::ConvertUsingNoDashPrefix) {
	// Conversion is implementing the "IDL attribute to CSS property algorithm"
	// from https://drafts.csswg.org/cssom/#idl-attribute-to-css-property.

	if constexpr (mode == CSSPropertyLookupMode::ConvertUsingDashPrefix)
	*outputBufferCurrent++ = '-';

	readCharactersForParsing(attribute, [&](auto buffer) {
	while (buffer.hasCharactersRemaining()) {
	auto c = *buffer++;
	ASSERT_WITH_MESSAGE(isASCII(c), "Invalid property name: %s", attribute.string().utf8().data());
	if (isASCIIUpper(c)) {
	*outputBufferCurrent++ = '-';
	*outputBufferCurrent++ = toASCIILowerUnchecked(c);
	} else
	*outputBufferCurrent++ = c;
	}
	});
	*outputBufferCurrent = '\0';
	} else {
	readCharactersForParsing(attribute, [&](auto buffer) {
	while (buffer.hasCharactersRemaining()) {
	auto c = *buffer++;
	ASSERT_WITH_MESSAGE(c == '-' \|\| isASCIILower(c), "Invalid property name: %s", attribute.string().utf8().data());
	*outputBufferCurrent++ = c;
	}
	});
	*outputBufferCurrent = '\0';
	}

	auto hashTableEntry = findProperty(outputBufferStart, outputBufferCurrent - outputBuffer);
	ASSERT_WITH_MESSAGE(hashTableEntry, "Invalid property name: %s", attribute.string().utf8().data());

	auto id = static_cast<CSSPropertyID>(hashTableEntry->id);
	cache.get().add(attribute, id);
	return id;
	}

	String CSSStyleDeclaration::propertyValueForCamelCasedIDLAttribute(const AtomString& attribute)
	{
	auto propertyID = lookupCSSPropertyFromIDLAttribute<CSSPropertyLookupMode::ConvertUsingNoDashPrefix>(attribute);
	ASSERT_WITH_MESSAGE(propertyID != CSSPropertyInvalid, "Invalid attribute: %s", attribute.string().utf8().data());
	return getPropertyValueInternal(propertyID);
	}

	ExceptionOr<void> CSSStyleDeclaration::setPropertyValueForCamelCasedIDLAttribute(const AtomString& attribute, const String& value)
	{
	auto propertyID = lookupCSSPropertyFromIDLAttribute<CSSPropertyLookupMode::ConvertUsingNoDashPrefix>(attribute);
	ASSERT_WITH_MESSAGE(propertyID != CSSPropertyInvalid, "Invalid attribute: %s", attribute.string().utf8().data());
	return setPropertyInternal(propertyID, value, false);
	}

	String CSSStyleDeclaration::propertyValueForWebKitCasedIDLAttribute(const AtomString& attribute)
	{
	auto propertyID = lookupCSSPropertyFromIDLAttribute<CSSPropertyLookupMode::ConvertUsingDashPrefix>(attribute);
	ASSERT_WITH_MESSAGE(propertyID != CSSPropertyInvalid, "Invalid attribute: %s", attribute.string().utf8().data());
	return getPropertyValueInternal(propertyID);
	}

	ExceptionOr<void> CSSStyleDeclaration::setPropertyValueForWebKitCasedIDLAttribute(const AtomString& attribute, const String& value)
	{
	auto propertyID = lookupCSSPropertyFromIDLAttribute<CSSPropertyLookupMode::ConvertUsingDashPrefix>(attribute);
	ASSERT_WITH_MESSAGE(propertyID != CSSPropertyInvalid, "Invalid attribute: %s", attribute.string().utf8().data());
	return setPropertyInternal(propertyID, value, false);
	}

	String CSSStyleDeclaration::propertyValueForDashedIDLAttribute(const AtomString& attribute)
	{
	auto propertyID = lookupCSSPropertyFromIDLAttribute<CSSPropertyLookupMode::NoConversion>(attribute);
	ASSERT_WITH_MESSAGE(propertyID != CSSPropertyInvalid, "Invalid attribute: %s", attribute.string().utf8().data());
	return getPropertyValueInternal(propertyID);
	}

	ExceptionOr<void> CSSStyleDeclaration::setPropertyValueForDashedIDLAttribute(const AtomString& attribute, const String& value)
	{
	auto propertyID = lookupCSSPropertyFromIDLAttribute<CSSPropertyLookupMode::NoConversion>(attribute);
	ASSERT_WITH_MESSAGE(propertyID != CSSPropertyInvalid, "Invalid attribute: %s", attribute.string().utf8().data());
	return setPropertyInternal(propertyID, value, false);
	}

	String CSSStyleDeclaration::propertyValueForEpubCasedIDLAttribute(const AtomString& attribute)
	{
	auto propertyID = lookupCSSPropertyFromIDLAttribute<CSSPropertyLookupMode::ConvertUsingDashPrefix>(attribute);
	ASSERT_WITH_MESSAGE(propertyID != CSSPropertyInvalid, "Invalid attribute: %s", attribute.string().utf8().data());
	return getPropertyValueInternal(propertyID);
	}

	ExceptionOr<void> CSSStyleDeclaration::setPropertyValueForEpubCasedIDLAttribute(const AtomString& attribute, const String& value)
	{
	auto propertyID = lookupCSSPropertyFromIDLAttribute<CSSPropertyLookupMode::ConvertUsingDashPrefix>(attribute);
	ASSERT_WITH_MESSAGE(propertyID != CSSPropertyInvalid, "Invalid attribute: %s", attribute.string().utf8().data());
	return setPropertyInternal(propertyID, value, false);
	}

	String CSSStyleDeclaration::cssFloat()
	{
	return getPropertyValueInternal(CSSPropertyFloat);
	}

	ExceptionOr<void> CSSStyleDeclaration::setCssFloat(const String& value)
	{
	return setPropertyInternal(CSSPropertyFloat, value, false /* important */);
	}

	}