private void DoCalculation()
{
try {
var result = _parser.Parse(_tokenizer.Tokenize(Text));
_context.SetVariableValue("ans", result);
HistoryText += Text + Environment.NewLine + result.ToString();
}
catch (Exception ex) {
HistoryText += Text + Environment.NewLine + ex.Message;
}
HistoryText += NewLine;
_expressionHistory.Add(Text);
_expressionHistoryIndex = _expressionHistory.Count;
Text = string.Empty;
}
public double Parse(IEnumerable <Token> tokens)
{
var first = tokens.First();
var second = tokens.ElementAtOrDefault(1);
if (second != null)
{
if (first is VariableToken && second.Text == "=")
{
var value = _calculator.CalculateFromInfix(tokens.Skip(2));
_context.SetVariableValue(first.Text, value);
return(value);
}
}
return(_calculator.CalculateFromInfix(tokens));
}
