private bool TryGetScriptError()

in ClearScript/Windows/Core/WindowsScriptItem.cs [56:125]
57 lines of code
18 McCabe index (conditional complexity)

        private bool TryGetScriptError(Exception exception, out IScriptEngineException scriptError)
        {
            // WORKAROUND: Windows Script items often throw ugly exceptions. The code here
            // attempts to clean up specific cases.

            while (exception is TargetInvocationException)
            {
                exception = exception.InnerException;
            }

            scriptError = exception as IScriptEngineException;
            if (scriptError != null)
            {
                return true;
            }

            if (exception is COMException comException)
            {
                var result = comException.ErrorCode;
                if (((result == HResult.SCRIPT_E_REPORTED) || (result == HResult.CLEARSCRIPT_E_HOSTEXCEPTION)) && (engine.CurrentScriptFrame != null))
                {
                    scriptError = engine.CurrentScriptFrame.ScriptError ?? engine.CurrentScriptFrame.PendingScriptError;
                    if (scriptError != null)
                    {
                        return true;
                    }

                    var hostException = engine.CurrentScriptFrame.HostException;
                    if (hostException != null)
                    {
                        scriptError = new ScriptEngineException(engine.Name, hostException.Message, null, HResult.CLEARSCRIPT_E_HOSTEXCEPTION, false, true, null, hostException);
                        return true;
                    }
                }
                else if (HResult.GetFacility(result) == HResult.FACILITY_CONTROL)
                {
                    // These exceptions often have awful messages that include COM error codes.
                    // The engine itself may be able to provide a better message.

                    if (engine.RuntimeErrorMap.TryGetValue(HResult.GetCode(result), out var runtimeErrorMessage) && (runtimeErrorMessage != exception.Message))
                    {
                        scriptError = new ScriptEngineException(engine.Name, runtimeErrorMessage, null, HResult.CLEARSCRIPT_E_SCRIPTITEMEXCEPTION, false, false, null, exception.InnerException);
                        return true;
                    }

                    if (engine.SyntaxErrorMap.TryGetValue(HResult.GetCode(result), out var syntaxErrorMessage) && (syntaxErrorMessage != exception.Message))
                    {
                        scriptError = new ScriptEngineException(engine.Name, syntaxErrorMessage, null, HResult.CLEARSCRIPT_E_SCRIPTITEMEXCEPTION, false, false, null, exception.InnerException);
                        return true;
                    }
                }
                else if ((result == HResult.DISP_E_MEMBERNOTFOUND) || (result == HResult.DISP_E_UNKNOWNNAME))
                {
                    // this usually indicates invalid object or property access in JScript
                    scriptError = new ScriptEngineException(engine.Name, "Invalid object or property access", null, HResult.CLEARSCRIPT_E_SCRIPTITEMEXCEPTION, false, false, null, exception.InnerException);
                    return true;
                }
            }
            else
            {
                if ((exception is ArgumentException argumentException) && (argumentException.ParamName == null))
                {
                    // this usually indicates invalid object or property access in VBScript
                    scriptError = new ScriptEngineException(engine.Name, "Invalid object or property access", null, HResult.CLEARSCRIPT_E_SCRIPTITEMEXCEPTION, false, false, null, exception.InnerException);
                    return true;
                }
            }

            return false;
        }