qtdeclarative/src/v4/qmljs_value.cpp

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#include <qmljs_engine.h>
#include <qv4object.h>
#include <qv4objectproto.h>

#include <wtf/MathExtras.h>

namespace QQmlJS {
namespace VM {


int Value::toUInt16(ExecutionContext *ctx) const
{
    if (isConvertibleToInt())
        return (ushort)(uint)integerValue();

    double number = __qmljs_to_number(*this, ctx);

    double D16 = 65536.0;
    if ((number >= 0 && number < D16))
        return static_cast<ushort>(number);

    if (!isfinite(number))
        return +0;

    double d = ::floor(::fabs(number));
    if (signbit(number))
        d = -d;

    number = ::fmod(d , D16);

    if (number < 0)
        number += D16;

    return (unsigned short)number;
}

double Value::toInteger(ExecutionContext *ctx) const
{
    if (isConvertibleToInt())
        return int_32;

    return Value::toInteger(__qmljs_to_number(*this, ctx));
}

double Value::toNumber(ExecutionContext *ctx) const
{
    return __qmljs_to_number(*this, ctx);
}

bool Value::sameValue(Value other) const {
    if (val == other.val)
        return true;
    if (isString() && other.isString())
        return stringValue()->isEqualTo(other.stringValue());
    if (isInteger())
        return int_32 ? (double(int_32) == other.dbl) : (other.val == 0);
    if (other.isInteger())
        return other.int_32 ? (dbl == double(other.int_32)) : (val == 0);
    return false;
}

Value Value::fromString(ExecutionContext *ctx, const QString &s)
{
    return fromString(ctx->engine->newString(s));
}

int Value::toInt32(double number)
{
    const double D32 = 4294967296.0;
    const double D31 = D32 / 2.0;

    if ((number >= -D31 && number < D31))
        return static_cast<int>(number);


    if (!isfinite(number))
        return 0;

    double d = ::floor(::fabs(number));
    if (signbit(number))
        d = -d;

    number = ::fmod(d , D32);

    if (number < -D31)
        number += D32;
    else if (number >= D31)
        number -= D32;

    return int(number);
}

unsigned int Value::toUInt32(double number)
{
    const double D32 = 4294967296.0;
    if ((number >= 0 && number < D32))
        return static_cast<uint>(number);

    if (!isfinite(number))
        return +0;

    double d = ::floor(::fabs(number));
    if (signbit(number))
        d = -d;

    number = ::fmod(d , D32);

    if (number < 0)
        number += D32;

    return unsigned(number);
}

double Value::toInteger(double number)
{
    if (isnan(number))
        return +0;
    else if (! number || isinf(number))
        return number;
    const double v = floor(fabs(number));
    return signbit(number) ? -v : v;
}

Value Value::property(ExecutionContext *ctx, String *name) const
{
    return isObject() ? objectValue()->__get__(ctx, name) : undefinedValue();
}



} // namespace VM
} // namespace QQmlJS