C++ HandleValue::toString方法代码示例

NS_IMETHODIMP nsAndroidBridge::HandleGeckoMessage(JS::HandleValue val,
        JSContext *cx)
{
    if (val.isObject()) {
        JS::RootedObject object(cx, &val.toObject());
        AndroidBridge::Bridge()->HandleGeckoMessage(cx, object);
        return NS_OK;
    }

    // Now handle legacy JSON messages.
    if (!val.isString()) {
        return NS_ERROR_INVALID_ARG;
    }
    JS::RootedString jsonStr(cx, val.toString());

    JS::RootedValue jsonVal(cx);
    if (!JS_ParseJSON(cx, jsonStr, &jsonVal) || !jsonVal.isObject()) {
        return NS_ERROR_INVALID_ARG;
    }

    // Spit out a warning before sending the message.
    nsContentUtils::ReportToConsoleNonLocalized(
        NS_LITERAL_STRING("Use of JSON is deprecated. "
                          "Please pass Javascript objects directly to handleGeckoMessage."),
        nsIScriptError::warningFlag,
        NS_LITERAL_CSTRING("nsIAndroidBridge"),
        nullptr);

    JS::RootedObject object(cx, &jsonVal.toObject());
    AndroidBridge::Bridge()->HandleGeckoMessage(cx, object);
    return NS_OK;
}

bool GetOVRStringVal(JSContext* cx, JS::HandleValue val, OVR::String* out) {
  if (!val.isString()) {
    JS_ReportError(cx, "Expected a string");
    return false;
  }
  JS::RootedString str(cx, val.toString());
  bool resp = GetOVRString(cx, str, out);
  return resp;
}

/**
 * gjs_string_to_ucs4:
 * @cx: a #JSContext
 * @value: JS::Value containing a string
 * @ucs4_string_p: return location for a #gunichar array
 * @len_p: return location for @ucs4_string_p length
 *
 * Returns: true on success, false otherwise in which case a JS error is thrown
 */
bool
gjs_string_to_ucs4(JSContext      *cx,
                   JS::HandleValue value,
                   gunichar      **ucs4_string_p,
                   size_t         *len_p)
{
    if (ucs4_string_p == NULL)
        return true;

    if (!value.isString()) {
        gjs_throw(cx, "Value is not a string, cannot convert to UCS-4");
        return false;
    }

    JSAutoRequest ar(cx);
    JS::RootedString str(cx, value.toString());
    size_t utf16_len;
    GError *error = NULL;

    const char16_t *utf16 = JS_GetStringCharsAndLength(cx, str, &utf16_len);
    if (utf16 == NULL) {
        gjs_throw(cx, "Failed to get UTF-16 string data");
        return false;
    }

    if (ucs4_string_p != NULL) {
        long length;
        *ucs4_string_p = g_utf16_to_ucs4(reinterpret_cast<const gunichar2 *>(utf16),
                                         utf16_len, NULL, &length, &error);
        if (*ucs4_string_p == NULL) {
            gjs_throw(cx, "Failed to convert UTF-16 string to UCS-4: %s",
                      error->message);
            g_clear_error(&error);
            return false;
        }
        if (len_p != NULL)
            *len_p = (size_t) length;
    }

    return true;
}

//.........这里部分代码省略.........
			JS::Rooted<JSPropertyDescriptor> desc(cx);
			if (!JS_GetPropertyDescriptorById(cx, obj, id, &desc))
				throw PSERROR_Serialize_ScriptError("JS_GetPropertyDescriptorById failed");
			if (desc.hasGetterObject())
				throw PSERROR_Serialize_ScriptError("Cannot serialize property getters");

			// Get the property name as a string
			if (!JS_IdToValue(cx, id, &idval))
				throw PSERROR_Serialize_ScriptError("JS_IdToValue failed");
			JS::RootedString idstr(cx, JS::ToString(cx, idval));
			if (!idstr)
				throw PSERROR_Serialize_ScriptError("JS_ValueToString failed");

			ScriptString("prop name", idstr);

			if (!JS_GetPropertyById(cx, obj, id, &propval))
				throw PSERROR_Serialize_ScriptError("JS_GetPropertyById failed");

			HandleScriptVal(propval);
		}

		break;
	}
	case JSTYPE_FUNCTION:
	{
		// We can't serialise functions, but we can at least name the offender (hopefully)
		std::wstring funcname(L"(unnamed)");
		JS::RootedFunction func(cx, JS_ValueToFunction(cx, val));
		if (func)
		{
			JS::RootedString string(cx, JS_GetFunctionId(func));
			if (string)
			{
				if (JS_StringHasLatin1Chars(string))
				{
					size_t length;
					JS::AutoCheckCannotGC nogc;
					const JS::Latin1Char* ch = JS_GetLatin1StringCharsAndLength(cx, nogc, string, &length);
					if (ch && length > 0)
						funcname.assign(ch, ch + length);
				}
				else
				{
					size_t length;
					JS::AutoCheckCannotGC nogc;
					const char16_t* ch = JS_GetTwoByteStringCharsAndLength(cx, nogc, string, &length);
					if (ch && length > 0)
						funcname.assign(ch, ch + length);
				}
			}
		}

		LOGERROR("Cannot serialise JS objects of type 'function': %s", utf8_from_wstring(funcname));
		throw PSERROR_Serialize_InvalidScriptValue();
	}
	case JSTYPE_STRING:
	{
		m_Serializer.NumberU8_Unbounded("type", SCRIPT_TYPE_STRING);
		JS::RootedString stringVal(cx, val.toString());
		ScriptString("string", stringVal);
		break;
	}
	case JSTYPE_NUMBER:
	{
		// To reduce the size of the serialized data, we handle integers and doubles separately.
		// We can't check for val.isInt32 and val.isDouble directly, because integer numbers are not guaranteed
		// to be represented as integers. A number like 33 could be stored as integer on the computer of one player
		// and as double on the other player's computer. That would cause out of sync errors in multiplayer games because
		// their binary representation and thus the hash would be different.

		double d;
		d = val.toNumber();
		i32 integer;

		if (JS_DoubleIsInt32(d, &integer))
		{
			m_Serializer.NumberU8_Unbounded("type", SCRIPT_TYPE_INT);
			m_Serializer.NumberI32_Unbounded("value", integer);
		}
		else
		{
			m_Serializer.NumberU8_Unbounded("type", SCRIPT_TYPE_DOUBLE);
			m_Serializer.NumberDouble_Unbounded("value", d);
		}
		break;
	}
	case JSTYPE_BOOLEAN:
	{
		m_Serializer.NumberU8_Unbounded("type", SCRIPT_TYPE_BOOLEAN);
		bool b = val.toBoolean();
		m_Serializer.NumberU8_Unbounded("value", b ? 1 : 0);
		break;
	}
	default:
	{
		debug_warn(L"Invalid TypeOfValue");
		throw PSERROR_Serialize_InvalidScriptValue();
	}
	}
}