public string runScript(string script)
{
IntPtr returnValue;
try
{
JavaScriptValue result;
JavaScriptValue promiseResult;
if (Native.JsRunScript(script, currentSourceContext++, "", out result) != JavaScriptErrorCode.NoError)
{
// Get error message and clear exception
JavaScriptValue exception;
if (Native.JsGetAndClearException(out exception) != JavaScriptErrorCode.NoError)
{
return("failed to get and clear exception");
}
JavaScriptPropertyId messageName;
if (Native.JsGetPropertyIdFromName("message",
out messageName) != JavaScriptErrorCode.NoError)
{
return("failed to get error message id");
}
JavaScriptValue messageValue;
if (Native.JsGetProperty(exception, messageName, out messageValue)
!= JavaScriptErrorCode.NoError)
{
return("failed to get error message");
}
IntPtr message;
UIntPtr length;
if (Native.JsStringToPointer(messageValue, out message, out length) != JavaScriptErrorCode.NoError)
{
return("failed to convert error message");
}
return(Marshal.PtrToStringUni(message));
}
// Execute promise tasks stored in promiseCallback
while (promiseCallback.toIntPtr() != IntPtr.Zero)
{
JavaScriptValue task = promiseCallback;
promiseCallback = new JavaScriptValue(IntPtr.Zero);
Native.JsCallFunction(task, null, 0, out promiseResult);
}
// Convert the return value.
JavaScriptValue stringResult;
UIntPtr stringLength;
if (Native.JsConvertValueToString(result, out stringResult) != JavaScriptErrorCode.NoError)
{
return("failed to convert value to string.");
}
if (Native.JsStringToPointer(stringResult, out returnValue, out stringLength) != JavaScriptErrorCode.NoError)
{
return("failed to convert return value.");
}
}
catch (Exception e)
{
return("chakrahost: fatal error: internal error: " + e.Message);
}
return(Marshal.PtrToStringUni(returnValue));
}