StringConstructor.cpp [plain text]
#include "config.h"
#include "StringConstructor.h"
#include "Error.h"
#include "JITCode.h"
#include "JSFunction.h"
#include "JSGlobalObject.h"
#include "JSCInlines.h"
#include "StringPrototype.h"
#include <wtf/text/StringBuilder.h>
namespace JSC {
static EncodedJSValue JSC_HOST_CALL stringFromCharCode(ExecState*);
static EncodedJSValue JSC_HOST_CALL stringFromCodePoint(ExecState*);
}
#include "StringConstructor.lut.h"
namespace JSC {
const ClassInfo StringConstructor::s_info = { "Function", &InternalFunction::s_info, &stringConstructorTable, nullptr, CREATE_METHOD_TABLE(StringConstructor) };
STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(StringConstructor);
static EncodedJSValue JSC_HOST_CALL callStringConstructor(ExecState*);
static EncodedJSValue JSC_HOST_CALL constructWithStringConstructor(ExecState*);
StringConstructor::StringConstructor(VM& vm, Structure* structure)
: InternalFunction(vm, structure, callStringConstructor, constructWithStringConstructor)
{
}
void StringConstructor::finishCreation(VM& vm, StringPrototype* stringPrototype)
{
Base::finishCreation(vm, stringPrototype->classInfo()->className);
putDirectWithoutTransition(vm, vm.propertyNames->prototype, stringPrototype, PropertyAttribute::ReadOnly | PropertyAttribute::DontEnum | PropertyAttribute::DontDelete);
putDirectWithoutTransition(vm, vm.propertyNames->length, jsNumber(1), PropertyAttribute::ReadOnly | PropertyAttribute::DontEnum);
}
static EncodedJSValue JSC_HOST_CALL stringFromCharCode(ExecState* exec)
{
VM& vm = exec->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
unsigned length = exec->argumentCount();
if (LIKELY(length == 1)) {
scope.release();
unsigned code = exec->uncheckedArgument(0).toUInt32(exec);
return JSValue::encode(jsSingleCharacterString(exec, code));
}
UChar* buf;
auto impl = StringImpl::createUninitialized(length, buf);
for (unsigned i = 0; i < length; ++i) {
buf[i] = static_cast<UChar>(exec->uncheckedArgument(i).toUInt32(exec));
RETURN_IF_EXCEPTION(scope, encodedJSValue());
}
RELEASE_AND_RETURN(scope, JSValue::encode(jsString(exec, WTFMove(impl))));
}
JSString* JSC_HOST_CALL stringFromCharCode(ExecState* exec, int32_t arg)
{
return jsSingleCharacterString(exec, arg);
}
static EncodedJSValue JSC_HOST_CALL stringFromCodePoint(ExecState* exec)
{
VM& vm = exec->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
unsigned length = exec->argumentCount();
StringBuilder builder;
builder.reserveCapacity(length);
for (unsigned i = 0; i < length; ++i) {
double codePointAsDouble = exec->uncheckedArgument(i).toNumber(exec);
RETURN_IF_EXCEPTION(scope, encodedJSValue());
uint32_t codePoint = static_cast<uint32_t>(codePointAsDouble);
if (codePoint != codePointAsDouble || codePoint > UCHAR_MAX_VALUE)
return throwVMError(exec, scope, createRangeError(exec, "Arguments contain a value that is out of range of code points"_s));
if (U_IS_BMP(codePoint))
builder.append(static_cast<UChar>(codePoint));
else {
builder.append(U16_LEAD(codePoint));
builder.append(U16_TRAIL(codePoint));
}
}
RELEASE_AND_RETURN(scope, JSValue::encode(jsString(exec, builder.toString())));
}
static EncodedJSValue JSC_HOST_CALL constructWithStringConstructor(ExecState* exec)
{
VM& vm = exec->vm();
JSGlobalObject* globalObject = jsCast<InternalFunction*>(exec->jsCallee())->globalObject(vm);
auto scope = DECLARE_THROW_SCOPE(vm);
Structure* structure = InternalFunction::createSubclassStructure(exec, exec->newTarget(), globalObject->stringObjectStructure());
RETURN_IF_EXCEPTION(scope, encodedJSValue());
if (!exec->argumentCount())
return JSValue::encode(StringObject::create(vm, structure));
JSString* str = exec->uncheckedArgument(0).toString(exec);
RETURN_IF_EXCEPTION(scope, encodedJSValue());
return JSValue::encode(StringObject::create(vm, structure, str));
}
JSString* stringConstructor(ExecState* exec, JSValue argument)
{
if (argument.isSymbol())
return jsNontrivialString(exec, asSymbol(argument)->descriptiveString());
return argument.toString(exec);
}
static EncodedJSValue JSC_HOST_CALL callStringConstructor(ExecState* exec)
{
if (!exec->argumentCount())
return JSValue::encode(jsEmptyString(exec));
return JSValue::encode(stringConstructor(exec, exec->uncheckedArgument(0)));
}
}