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());
}
/*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;
}