//--------------------------------------------------------
// add or replace a definition
public void Set(MMC.Calc.CTerm_Base Term)
{
if (Term != null)
{
string Name = Term.Name;
_Operations[Name] = Term;
if (Name.Length > _LengthMax)
{
_LengthMax = Name.Length;
}
}
}
//------------------------------------------------------------
// find the longest match starting at pos in Term
public MMC.Calc.CTerm_Base Get(string Term, int pos)
{
int len = Term.Length - pos;
MMC.Calc.CTerm_Base rc = null;
for (int i = (len > _LengthMax) ? _LengthMax : len; i > 0; i--)
{
if (_Operations.TryGetValue(Term.Substring(pos, i), out rc))
{
break;
}
}
return(rc);
}
//------------------------------------------------------------
// combine two terms, e.g. "2sqrt2" = "2*sqrt2"
public MMC.Calc.CTerm_Base Combine(MMC.Calc.CTerm_Base A, MMC.Calc.CTerm_Base B)
{
return(new MMC.Calc.Functions.CTerm_Mul("*", A, B));
}
//------------------------------------------------------------
// analyse the string and return the operation
public MMC.Calc.CTerm_Base FindOp(ref string Term)
{
//--------------------------------------------------------
// make sure we have something to do
if (Term != null)
{
int length = Term.Length;
int idx = 0;
while (idx < length)
{
char c = Term[idx];
if (c != ' ' && c != '\t' && c != '\n' && c != '\r')
{
break;
}
idx++;
}
Term = Term.Substring(idx);
}
if (string.IsNullOrEmpty(Term))
{
return(null);
}
//--------------------------------------------------------
// find the match in the various operation maps
MMC.Calc.CTerm_Base Op = _Operations.Get(Term, 0);
if (Op != null)
{
Term = Term.Remove(0, Op.Name.Length);
return(Op.Clone());
}
Op = _Support.Get(Term, 0);
if (Op != null)
{
Term = Term.Remove(0, Op.Name.Length);
return(Op.Clone());
}
Op = _Constants.Get(Term, 0);
if (Op != null)
{
Term = Term.Remove(0, Op.Name.Length);
return(Op); // Do not clone a constant
}
Op = _Variables.Get(Term, 0);
if (Op != null)
{
Term = Term.Remove(0, Op.Name.Length);
return(Op); // Do not clone a variable
}
//--------------------------------------------------------
// is it a number
MMC.Numbers.CNumber N = NewNumber(0.0);
if (N.FromString(ref Term))
{
return(new MMC.Calc.Functions.CTerm_Number(N));
}
//--------------------------------------------------------
// check for an assignment
for (int pos = 1; pos < Term.Length; pos++)
{
Op = _Support.Get(Term, pos);
if (Op != null && Op.Type == CTerm_Base.TTermType.Assignment)
{
MMC.Calc.Functions.CTerm_Variable Var = new MMC.Calc.Functions.CTerm_Variable(Term.Substring(0, pos));
Term = Term.Remove(0, pos);
return(Var);
}
}
//--------------------------------------------------------
// nothing found so something's wrong somewhere
throw new CTermException("Unknown Function or Variable!");
}
//------------------------------------------------------------
// add a new or replace a function/variable
public void SetVariable(MMC.Calc.CTerm_Base Term)
{
_Variables.Set(Term);
}
