示例#1
0
/*static*/ status_t
CalcView::_EvaluateThread(void* data)
{
	CalcView* calcView = reinterpret_cast<CalcView*>(data);
	if (calcView == NULL)
		return B_BAD_TYPE;

	BMessenger messenger(calcView);
	if (!messenger.IsValid())
		return B_BAD_VALUE;

	BString result;
	status_t status = acquire_sem(calcView->fEvaluateSemaphore);
	if (status == B_OK) {
		ExpressionParser parser;
		parser.SetDegreeMode(calcView->fOptions->degree_mode);
		BString expression(calcView->fExpressionTextView->Text());
		try {
			result = parser.Evaluate(expression.String());
		} catch (ParseException e) {
			result << e.message.String() << " at " << (e.position + 1);
			status = B_ERROR;
		}
		release_sem(calcView->fEvaluateSemaphore);
	} else
		result = strerror(status);

	BMessage message(kMsgDoneEvaluating);
	message.AddString(status == B_OK ? "value" : "error", result.String());
	messenger.SendMessage(&message);

	return status;
}
示例#2
0
文件: CalcView.cpp 项目: ysei/haiku
void
CalcView::Evaluate()
{
	BString expression = fExpressionTextView->Text();

	if (expression.Length() == 0) {
		beep();
		return;
	}

	_AudioFeedback(false);

	// evaluate expression
	BString value;

	try {
		ExpressionParser parser;
		parser.SetDegreeMode(fOptions->degree_mode);
		value = parser.Evaluate(expression.String());
	} catch (ParseException e) {
		BString error(e.message.String());
		error << " at " << (e.position + 1);
		fExpressionTextView->SetText(error.String());
		return;
	}

	// render new result to display
	fExpressionTextView->SetValue(value.String());
}
示例#3
0
int
main(int argc, char* argv[])
{
	if (argc == 1) {
		// run GUI
		CalcApplication* app = new CalcApplication();

		app->Run();
		delete app;
	} else {
		// evaluate expression from command line
		BString expression;
		int32 i = 1;
		while (i < argc) {
			expression << argv[i];
			i++;
		}

		try {
			ExpressionParser parser;
			BString result = parser.Evaluate(expression.String());
			printf("%s\n", result.String());
		} catch (ParseException e) {
			printf("%s at %" B_PRId32 "\n", e.message.String(), e.position + 1);
			return 1;
		}
	}

	return 0;
}