public override bool TryCreate(string pattern, FormulaBuilder builder, out FormulaItem item)
{
string trimmed = pattern.Trim();
item = null;
bool isSymbol = Regex.IsMatch(trimmed, REGEX) || Regex.IsMatch(trimmed, REGEX2);
if (!isSymbol)
{
return(false);
}
item = new SymbolItem();
item.Pattern = pattern;
(item as SymbolItem).Symbol = trimmed;
return(true);
}
public Element Convert(FormulaItem item)
{
Element element = null;
if (item is ValueItem)
{
ValueItem i = (ValueItem)item;
ValueElement e = new ValueElement();
e.Value = i.Value.ToString();
element = e;
}
if (item is SymbolItem)
{
SymbolItem i = (SymbolItem)item;
SymbolElement e = new SymbolElement();
if (!string.IsNullOrEmpty(i.Symbol))
{
string[] splited = i.Symbol.Split('.');
e.Symbol = splited[0];
if (splited.Length == 2)
{
e.Suffix = splited[1];
}
}
element = e;
}
if (item is UnitItem)
{
UnitItem u = (UnitItem)item;
UnitElement e = new UnitElement();
e.Unit = u.Unit;
element = e;
}
if (item is FunctionSum)
{
FunctionSum sum = (FunctionSum)item;
SumElement sumElem = new SumElement();
for (int i = 0; i < sum.Coeffs.Count; ++i)
{
if (i == 0)
{
sumElem.Signs.Add(string.Empty);
continue;
}
double coeff = sum.Coeffs[i];
string sign = (coeff > 0) ? "+" : "-";
sumElem.Signs.Add(sign);
}
element = sumElem;
}
if (item is FunctionMultiply)
{
FunctionMultiply multi = (FunctionMultiply)item;
if (multi.Arguments.Count == 2 && multi.Flags[1] == false)
{
FractionElement fraction = new FractionElement();
element = fraction;
}
else
{
SumElement sumElem = new SumElement();
for (int i = 0; i < multi.Flags.Count; ++i)
{
if (i == 0)
{
sumElem.Signs.Add(string.Empty);
continue;
}
bool flag = multi.Flags[i];
string sign = flag ? "x" : "/";
sumElem.Signs.Add(sign);
}
element = sumElem;
}
}
if (item is FunctionSqrt)
{
element = new SqrtElement();
}
if (item is FunctionPow)
{
element = new PowElement();
}
if (item is FunctionMax)
{
element = createElement("max");
}
if (item is FunctionMin)
{
element = createElement("min");
}
if (item is FunctionSin)
{
element = createElement("sin");
}
if (item is FunctionCos)
{
element = createElement("cos");
}
if (item is FunctionTan)
{
element = createElement("tan");
}
if (item is BracketItem)
{
element = createElement("");
}
if (item is FunctionItem)
{
FunctionItem function = (FunctionItem)item;
foreach (FormulaItem arg in function.Arguments)
{
Element argElement = Convert(arg);
element.Arguments.Add(argElement);
}
}
return(element);
}