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/*
* 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 */);
}
}