IntlObjectInlines.h [plain text]
#pragma once
#include "BuiltinNames.h"
#include "IntlObject.h"
#include "JSBoundFunction.h"
#include "JSObject.h"
#include <unicode/ucol.h>
namespace JSC {
template<typename StringType>
static constexpr uint32_t computeTwoCharacters16Code(const StringType& string)
{
return static_cast<uint16_t>(string.characterAt(0)) | (static_cast<uint32_t>(static_cast<uint16_t>(string.characterAt(1))) << 16);
}
template<typename Predicate> String bestAvailableLocale(const String& locale, Predicate predicate)
{
String candidate = locale;
while (!candidate.isEmpty()) {
if (predicate(candidate))
return candidate;
size_t pos = candidate.reverseFind('-');
if (pos == notFound)
return String();
if (pos >= 2 && candidate[pos - 2] == '-')
pos -= 2;
candidate = candidate.substring(0, pos);
}
return String();
}
template<typename Constructor, typename Factory>
JSValue constructIntlInstanceWithWorkaroundForLegacyIntlConstructor(JSGlobalObject* globalObject, JSValue thisValue, Constructor* callee, Factory factory)
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
auto* instance = factory(vm);
RETURN_IF_EXCEPTION(scope, JSValue());
if (thisValue.isObject()) {
JSObject* thisObject = asObject(thisValue);
ASSERT(!callee->template inherits<JSBoundFunction>(vm));
JSValue prototype = callee->getDirect(vm, vm.propertyNames->prototype); ASSERT(prototype);
bool hasInstance = JSObject::defaultHasInstance(globalObject, thisObject, prototype);
RETURN_IF_EXCEPTION(scope, JSValue());
if (hasInstance) {
PropertyDescriptor descriptor(instance, PropertyAttribute::ReadOnly | PropertyAttribute::DontEnum | PropertyAttribute::DontDelete);
scope.release();
thisObject->methodTable(vm)->defineOwnProperty(thisObject, globalObject, vm.propertyNames->builtinNames().intlLegacyConstructedSymbol(), descriptor, true);
return thisObject;
}
}
return instance;
}
template<typename InstanceType>
InstanceType* unwrapForLegacyIntlConstructor(JSGlobalObject* globalObject, JSValue thisValue, JSObject* constructor)
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
JSObject* thisObject = jsDynamicCast<JSObject*>(vm, thisValue);
if (UNLIKELY(!thisObject))
return nullptr;
auto* instance = jsDynamicCast<InstanceType*>(vm, thisObject);
if (LIKELY(instance))
return instance;
ASSERT(!constructor->template inherits<JSBoundFunction>(vm));
JSValue prototype = constructor->getDirect(vm, vm.propertyNames->prototype); ASSERT(prototype);
bool hasInstance = JSObject::defaultHasInstance(globalObject, thisObject, prototype);
RETURN_IF_EXCEPTION(scope, nullptr);
if (!hasInstance)
return nullptr;
JSValue value = thisObject->get(globalObject, vm.propertyNames->builtinNames().intlLegacyConstructedSymbol());
RETURN_IF_EXCEPTION(scope, nullptr);
return jsDynamicCast<InstanceType*>(vm, value);
}
template<typename ResultType>
ResultType intlOption(JSGlobalObject* globalObject, JSValue options, PropertyName property, std::initializer_list<std::pair<ASCIILiteral, ResultType>> values, ASCIILiteral notFoundMessage, ResultType fallback)
{
ASSERT(values.size() > 0);
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
if (options.isUndefined())
return fallback;
JSObject* opts = options.toObject(globalObject);
RETURN_IF_EXCEPTION(scope, { });
JSValue value = opts->get(globalObject, property);
RETURN_IF_EXCEPTION(scope, { });
if (!value.isUndefined()) {
String stringValue = value.toWTFString(globalObject);
RETURN_IF_EXCEPTION(scope, { });
for (const auto& entry : values) {
if (entry.first == stringValue)
return entry.second;
}
throwException(globalObject, scope, createRangeError(globalObject, notFoundMessage));
return { };
}
return fallback;
}
ALWAYS_INLINE bool canUseASCIIUCADUCETComparison(UChar character)
{
return isASCII(character) && ducetWeights[character];
}
template<typename CharacterType1, typename CharacterType2>
inline UCollationResult compareASCIIWithUCADUCET(const CharacterType1* characters1, unsigned length1, const CharacterType2* characters2, unsigned length2)
{
unsigned commonLength = std::min(length1, length2);
for (unsigned position = 0; position < commonLength; ++position) {
auto lhs = characters1[position];
auto rhs = characters2[position];
ASSERT(canUseASCIIUCADUCETComparison(lhs));
ASSERT(canUseASCIIUCADUCETComparison(rhs));
uint8_t leftWeight = ducetWeights[lhs];
uint8_t rightWeight = ducetWeights[rhs];
if (leftWeight == rightWeight)
continue;
return leftWeight > rightWeight ? UCOL_GREATER : UCOL_LESS;
}
if (length1 == length2)
return UCOL_EQUAL;
return length1 > length2 ? UCOL_GREATER : UCOL_LESS;
}
}