C++ TiValue::toString方法代码示例

UString TiObject::toString(TiExcState* exec) const
{
    TiValue primitive = toPrimitive(exec, PreferString);
    if (exec->hadException())
        return "";
    return primitive.toString(exec);
}

EncodedTiValue JSC_HOST_CALL numberProtoFuncToLocaleString(TiExcState* exec)
{
    TiValue thisValue = exec->hostThisValue();
    // FIXME: Not implemented yet.

    TiValue v = thisValue.getJSNumber();
    if (!v)
        return throwVMTypeError(exec);

    return TiValue::encode(jsString(exec, v.toString(exec)));
}

EncodedTiValue JSC_HOST_CALL errorProtoFuncToString(TiExcState* exec)
{
    TiObject* thisObj = exec->hostThisValue().toThisObject(exec);

    StringRecursionChecker checker(exec, thisObj);
    if (EncodedTiValue earlyReturnValue = checker.earlyReturnValue())
        return earlyReturnValue;

    TiValue name = thisObj->get(exec, exec->propertyNames().name);
    TiValue message = thisObj->get(exec, exec->propertyNames().message);

    // Mozilla-compatible format.

    if (!name.isUndefined()) {
        if (!message.isUndefined())
            return TiValue::encode(jsMakeNontrivialString(exec, name.toString(exec), ": ", message.toString(exec)));
        return TiValue::encode(jsNontrivialString(exec, name.toString(exec)));
    }
    if (!message.isUndefined())
        return TiValue::encode(jsMakeNontrivialString(exec, "Error: ", message.toString(exec)));
    return TiValue::encode(jsNontrivialString(exec, "Error"));
}

ALWAYS_INLINE static void operationPutByValInternal(TiExcState* exec, EncodedTiValue encodedBase, EncodedTiValue encodedProperty, EncodedTiValue encodedValue)
{
    TiGlobalData* globalData = &exec->globalData();

    TiValue baseValue = TiValue::decode(encodedBase);
    TiValue property = TiValue::decode(encodedProperty);
    TiValue value = TiValue::decode(encodedValue);

    if (LIKELY(property.isUInt32())) {
        uint32_t i = property.asUInt32();

        if (isTiArray(globalData, baseValue)) {
            TiArray* jsArray = asArray(baseValue);
            if (jsArray->canSetIndex(i)) {
                jsArray->setIndex(*globalData, i, value);
                return;
            }

            jsArray->TiArray::put(exec, i, value);
            return;
        }

        if (isTiArrayArray(globalData, baseValue) && asByteArray(baseValue)->canAccessIndex(i)) {
            TiArrayArray* jsByteArray = asByteArray(baseValue);
            // FIXME: the JITstub used to relink this to an optimized form!
            if (value.isInt32()) {
                jsByteArray->setIndex(i, value.asInt32());
                return;
            }

            double dValue = 0;
            if (value.getNumber(dValue)) {
                jsByteArray->setIndex(i, dValue);
                return;
            }
        }

        baseValue.put(exec, i, value);
        return;
    }

    // Don't put to an object if toString throws an exception.
    Identifier ident(exec, property.toString(exec));
    if (!globalData->exception) {
        PutPropertySlot slot(strict);
        baseValue.put(exec, ident, value, slot);
    }
}

TiStringRef TiValueToStringCopy(TiContextRef ctx, TiValueRef value, TiValueRef* exception)
{
    TiExcState* exec = toJS(ctx);
    APIEntryShim entryShim(exec);

    TiValue jsValue = toJS(exec, value);
    
    RefPtr<OpaqueTiString> stringRef(OpaqueTiString::create(jsValue.toString(exec)));
    if (exec->hadException()) {
        if (exception)
            *exception = toRef(exec, exec->exception());
        exec->clearException();
        stringRef.clear();
    }
    return stringRef.release().releaseRef();
}

EncodedTiValue operationGetByVal(TiExcState* exec, EncodedTiValue encodedBase, EncodedTiValue encodedProperty)
{
    TiValue baseValue = TiValue::decode(encodedBase);
    TiValue property = TiValue::decode(encodedProperty);

    if (LIKELY(baseValue.isCell())) {
        TiCell* base = baseValue.asCell();

        if (property.isUInt32()) {
            TiGlobalData* globalData = &exec->globalData();
            uint32_t i = property.asUInt32();

            // FIXME: the JIT used to handle these in compiled code!
            if (isTiArray(globalData, base) && asArray(base)->canGetIndex(i))
                return TiValue::encode(asArray(base)->getIndex(i));

            // FIXME: the JITstub used to relink this to an optimized form!
            if (isTiString(globalData, base) && asString(base)->canGetIndex(i))
                return TiValue::encode(asString(base)->getIndex(exec, i));

            // FIXME: the JITstub used to relink this to an optimized form!
            if (isTiArrayArray(globalData, base) && asByteArray(base)->canAccessIndex(i))
                return TiValue::encode(asByteArray(base)->getIndex(exec, i));

            return TiValue::encode(baseValue.get(exec, i));
        }

        if (property.isString()) {
            Identifier propertyName(exec, asString(property)->value(exec));
            PropertySlot slot(base);
            if (base->fastGetOwnPropertySlot(exec, propertyName, slot))
                return TiValue::encode(slot.getValue(exec, propertyName));
        }
    }

    Identifier ident(exec, property.toString(exec));
    return TiValue::encode(baseValue.get(exec, ident));
}

EncodedTiValue JSC_HOST_CALL numberProtoFuncToString(TiExcState* exec)
{
    TiValue thisValue = exec->hostThisValue();
    TiValue v = thisValue.getJSNumber();
    if (!v)
        return throwVMTypeError(exec);

    TiValue radixValue = exec->argument(0);
    int radix;
    if (radixValue.isInt32())
        radix = radixValue.asInt32();
    else if (radixValue.isUndefined())
        radix = 10;
    else
        radix = static_cast<int>(radixValue.toInteger(exec)); // nan -> 0

    if (radix == 10)
        return TiValue::encode(jsString(exec, v.toString(exec)));

    static const char* const digits = "0123456789abcdefghijklmnopqrstuvwxyz";

    // Fast path for number to character conversion.
    if (radix == 36) {
        if (v.isInt32()) {
            int x = v.asInt32();
            if (static_cast<unsigned>(x) < 36) { // Exclude negatives
                TiGlobalData* globalData = &exec->globalData();
                return TiValue::encode(globalData->smallStrings.singleCharacterString(globalData, digits[x]));
            }
        }
    }

    if (radix < 2 || radix > 36)
        return throwVMError(exec, createRangeError(exec, "toString() radix argument must be between 2 and 36"));

    // INT_MAX results in 1024 characters left of the dot with radix 2
    // give the same space on the right side. safety checks are in place
    // unless someone finds a precise rule.
    char s[2048 + 3];
    const char* lastCharInString = s + sizeof(s) - 1;
    double x = v.uncheckedGetNumber();
    if (isnan(x) || isinf(x))
        return TiValue::encode(jsString(exec, UString::number(x)));

    bool isNegative = x < 0.0;
    if (isNegative)
        x = -x;

    double integerPart = floor(x);
    char* decimalPoint = s + sizeof(s) / 2;

    // convert integer portion
    char* p = decimalPoint;
    double d = integerPart;
    do {
        int remainderDigit = static_cast<int>(fmod(d, radix));
        *--p = digits[remainderDigit];
        d /= radix;
    } while ((d <= -1.0 || d >= 1.0) && s < p);

    if (isNegative)
        *--p = '-';
    char* startOfResultString = p;
    ASSERT(s <= startOfResultString);

    d = x - integerPart;
    p = decimalPoint;
    const double epsilon = 0.001; // TODO: guessed. base on radix ?
    bool hasFractionalPart = (d < -epsilon || d > epsilon);
    if (hasFractionalPart) {
        *p++ = '.';
        do {
            d *= radix;
            const int digit = static_cast<int>(d);
            *p++ = digits[digit];
            d -= digit;
        } while ((d < -epsilon || d > epsilon) && p < lastCharInString);
    }
    *p = '\0';
    ASSERT(p < s + sizeof(s));

    return TiValue::encode(jsString(exec, startOfResultString));
}