private IExpression GetExpression(SubExpression s)
{
var subs = s.GetSubExpressions();
if (subs == null)
{
return(null);
}
if (subs.Length == 1)
{
if (!subs[0].ExpressionString.HasMathSymbols())
{
if (subs[0].ExpressionString.All(char.IsLetter))
{
if (!Variables.ContainsKey(subs[0].ExpressionString))
{
Variables.Add(subs[0].ExpressionString, 0);
}
return(new VariableValueExpression(subs[0].ExpressionString, Variables));
}
return(new StaticValueExpression(subs[0].ExpressionString));
}
else
{
var ct = GetCalcType(subs[0].ExpressionString[0]);
if (ct != null)
{
return(new StaticCalcExpression(ct.Value));
}
else
{
throw new InvalidExpressionException(subs[0].ExpressionString);
}
}
}
var es = new List <IExpression>();
for (var i = 0; i < subs.Length; i++)
{
var ex = GetExpression(subs[i]);
if (ex != null)
{
es.Add(ex);
}
}
if (es.Count > 0)
{
if (es.Count < 3)
{
throw new InvalidExpressionException(s.ExpressionString);
}
if (es.Any(e => e is StaticCalcExpression))
{
do
{
var index = IndexOfCalc(es);
var calc = (StaticCalcExpression)es[index];
var v1 = es[index - 1];
var v2 = es[index + 1];
var e = new CalcExpression(v1, v2, calc.Type);
es.RemoveRange(index - 1, 3);
es.Insert(index - 1, e);
} while (es.Count > 1);
}
return(es.First());
}
return(null);
}