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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 "RuntimeEnabledFeatures.h"
#include "Settings.h"
#include "StyledElement.h"
#include <wtf/IsoMallocInlines.h>
#include <wtf/Optional.h>
#include <wtf/Variant.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(CSSStyleDeclaration);
namespace {
enum class PropertyNamePrefix {
None, Epub, CSS, Pixel, Pos, WebKit,
#if ENABLE(LEGACY_CSS_VENDOR_PREFIXES)
Apple, KHTML,
#endif
};
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) {
#if ENABLE(LEGACY_CSS_VENDOR_PREFIXES)
case 'a':
if (RuntimeEnabledFeatures::sharedFeatures().legacyCSSVendorPrefixesEnabled() && matchesCSSPropertyNamePrefix(propertyName, "apple"))
return PropertyNamePrefix::Apple;
break;
#endif
case 'c':
if (matchesCSSPropertyNamePrefix(propertyName, "css"))
return PropertyNamePrefix::CSS;
break;
#if ENABLE(LEGACY_CSS_VENDOR_PREFIXES)
case 'k':
if (RuntimeEnabledFeatures::sharedFeatures().legacyCSSVendorPrefixesEnabled() && matchesCSSPropertyNamePrefix(propertyName, "khtml"))
return PropertyNamePrefix::KHTML;
break;
#endif
case 'e':
if (matchesCSSPropertyNamePrefix(propertyName, "epub"))
return PropertyNamePrefix::Epub;
break;
case 'p':
if (matchesCSSPropertyNamePrefix(propertyName, "pos"))
return PropertyNamePrefix::Pos;
if (matchesCSSPropertyNamePrefix(propertyName, "pixel"))
return PropertyNamePrefix::Pixel;
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++ = '-';
}
struct CSSPropertyInfo {
CSSPropertyID propertyID;
bool hadPixelOrPosPrefix;
};
static CSSPropertyInfo parseJavaScriptCSSPropertyName(const AtomString& propertyName)
{
using CSSPropertyInfoMap = HashMap<String, CSSPropertyInfo>;
static NeverDestroyed<CSSPropertyInfoMap> propertyInfoCache;
CSSPropertyInfo propertyInfo = { CSSPropertyInvalid, false };
auto* propertyNameString = propertyName.impl();
if (!propertyNameString)
return propertyInfo;
unsigned length = propertyNameString->length();
if (!length)
return propertyInfo;
propertyInfo = propertyInfoCache.get().get(propertyNameString);
if (propertyInfo.propertyID)
return propertyInfo;
bool hadPixelOrPosPrefix = false;
constexpr size_t bufferSize = maxCSSPropertyNameLength + 1;
char buffer[bufferSize];
char* bufferPtr = buffer;
const char* name = bufferPtr;
unsigned i = 0;
// Prefixes CSS, Pixel, Pos are ignored.
// Prefixes Apple, KHTML and Webkit are transposed to "-webkit-".
// The prefix "Epub" becomes "-epub-".
switch (propertyNamePrefix(*propertyNameString)) {
case PropertyNamePrefix::None:
if (isASCIIUpper((*propertyNameString)[0]))
return propertyInfo;
break;
case PropertyNamePrefix::CSS:
i += 3;
break;
case PropertyNamePrefix::Pixel:
i += 5;
hadPixelOrPosPrefix = true;
break;
case PropertyNamePrefix::Pos:
i += 3;
hadPixelOrPosPrefix = true;
break;
#if ENABLE(LEGACY_CSS_VENDOR_PREFIXES)
case PropertyNamePrefix::Apple:
case PropertyNamePrefix::KHTML:
ASSERT(RuntimeEnabledFeatures::sharedFeatures().legacyCSSVendorPrefixesEnabled());
writeWebKitPrefix(bufferPtr);
i += 5;
break;
#endif
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 propertyInfo;
for (; i < length; ++i) {
UChar c = (*propertyNameString)[i];
if (!c || !isASCII(c))
return propertyInfo; // illegal character
if (isASCIIUpper(c)) {
size_t bufferSizeLeft = stringEnd - bufferPtr;
size_t propertySizeLeft = length - i + 1;
if (propertySizeLeft > bufferSizeLeft)
return propertyInfo;
*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;
#if PLATFORM(IOS_FAMILY)
cssPropertyNameIOSAliasing(buffer, name, outputLength);
#endif
auto* hashTableEntry = findProperty(name, outputLength);
if (auto propertyID = hashTableEntry ? hashTableEntry->id : 0) {
auto id = static_cast<CSSPropertyID>(propertyID);
propertyInfo.hadPixelOrPosPrefix = hadPixelOrPosPrefix;
propertyInfo.propertyID = id;
propertyInfoCache.get().add(propertyNameString, propertyInfo);
}
return propertyInfo;
}
static CSSPropertyInfo propertyInfoFromJavaScriptCSSPropertyName(const AtomString& propertyName, const Settings* settings)
{
auto propertyInfo = parseJavaScriptCSSPropertyName(propertyName);
auto id = propertyInfo.propertyID;
if (!isEnabledCSSProperty(id) || !isCSSPropertyEnabledBySettings(id, settings))
return { CSSPropertyInvalid, false };
return propertyInfo;
}
}
CSSPropertyID CSSStyleDeclaration::getCSSPropertyIDFromJavaScriptPropertyName(const AtomString& propertyName)
{
return propertyInfoFromJavaScriptCSSPropertyName(propertyName, nullptr).propertyID;
}
Optional<Variant<String, double>> CSSStyleDeclaration::namedItem(const AtomString& propertyName)
{
auto* settings = parentElement() ? &parentElement()->document().settings() : nullptr;
auto propertyInfo = propertyInfoFromJavaScriptCSSPropertyName(propertyName, settings);
if (!propertyInfo.propertyID)
return WTF::nullopt;
auto value = getPropertyCSSValueInternal(propertyInfo.propertyID);
if (!value) {
// If the property is a shorthand property (such as "padding"), it can only be accessed using getPropertyValue.
return Variant<String, double> { getPropertyValueInternal(propertyInfo.propertyID) };
}
if (propertyInfo.hadPixelOrPosPrefix && is<CSSPrimitiveValue>(*value)) {
// Call this version of the getter so that, e.g., pixelTop returns top as a number
// in pixel units and posTop should does the same _if_ this is a positioned element.
// FIXME: If not a positioned element, MSIE documentation says posTop should return 0; this rule is not implemented.
return Variant<String, double> { downcast<CSSPrimitiveValue>(*value).floatValue(CSSUnitType::CSS_PX) };
}
return Variant<String, double> { value->cssText() };
}
ExceptionOr<void> CSSStyleDeclaration::setNamedItem(const AtomString& propertyName, String value, bool& propertySupported)
{
auto* settings = parentElement() ? &parentElement()->document().settings() : nullptr;
auto propertyInfo = propertyInfoFromJavaScriptCSSPropertyName(propertyName, settings);
if (!propertyInfo.propertyID) {
propertySupported = false;
return { };
}
propertySupported = true;
if (propertyInfo.hadPixelOrPosPrefix)
value.append("px");
bool important = false;
if (DeprecatedGlobalSettings::shouldRespectPriorityInCSSAttributeSetters()) {
auto importantIndex = value.findIgnoringASCIICase("!important");
if (importantIndex && importantIndex != notFound) {
important = true;
value = value.left(importantIndex - 1);
}
}
auto setPropertyInternalResult = setPropertyInternal(propertyInfo.propertyID, value, important);
if (setPropertyInternalResult.hasException())
return setPropertyInternalResult.releaseException();
return { };
}
Vector<AtomString> CSSStyleDeclaration::supportedPropertyNames() const
{
static unsigned numNames = 0;
static const AtomString* const cssPropertyNames = [] {
String names[numCSSProperties];
for (int i = 0; i < numCSSProperties; ++i) {
CSSPropertyID id = static_cast<CSSPropertyID>(firstCSSProperty + i);
// FIXME: Should take account for flags in settings().
if (isEnabledCSSProperty(id))
names[numNames++] = getJSPropertyName(id);
}
std::sort(&names[0], &names[numNames], WTF::codePointCompareLessThan);
auto* identifiers = new AtomString[numNames];
for (unsigned i = 0; i < numNames; ++i)
identifiers[i] = names[i];
return identifiers;
}();
Vector<AtomString> result;
result.reserveInitialCapacity(numNames);
for (unsigned i = 0; i < numNames; ++i)
result.uncheckedAppend(cssPropertyNames[i]);
return result;
}
String CSSStyleDeclaration::cssFloat()
{
return getPropertyValueInternal(CSSPropertyFloat);
}
ExceptionOr<void> CSSStyleDeclaration::setCssFloat(const String& value)
{
auto result = setPropertyInternal(CSSPropertyFloat, value, false /* important */);
if (result.hasException())
return result.releaseException();
return { };
}
}