public EvaluationName GetName(NamePtg namePtg)
{
int ix = namePtg.Index;
return new Name(_iBook.GetNameRecord(ix), ix);
}
/**
* Generates the variable function ptg for the formula.
* <p>
* For IF Formulas, Additional PTGs are Added To the Tokens
* @param name
* @param numArgs
* @return Ptg a null Is returned if we're in an IF formula, it needs extreme manipulation and Is handled in this function
*/
private ParseNode GetFunction(String name, NamePtg namePtg, ParseNode[] args)
{
FunctionMetadata fm = FunctionMetadataRegistry.GetFunctionByName(name.ToUpper());
int numArgs = args.Length;
if (fm == null)
{
if (namePtg == null)
{
throw new InvalidOperationException("NamePtg must be supplied for external functions");
}
// must be external function
ParseNode[] allArgs = new ParseNode[numArgs + 1];
allArgs[0] = new ParseNode(namePtg);
Array.Copy(args, 0, allArgs, 1, numArgs);
return new ParseNode(new FuncVarPtg(name, (byte)(numArgs + 1)), allArgs);
}
if (namePtg != null)
{
throw new InvalidOperationException("NamePtg no applicable To internal functions");
}
bool IsVarArgs = !fm.HasFixedArgsLength;
int funcIx = fm.Index;
ValidateNumArgs(args.Length, fm);
AbstractFunctionPtg retval;
if (IsVarArgs)
{
retval = new FuncVarPtg(name, (byte)numArgs);
}
else
{
retval = new FuncPtg(funcIx);
}
return new ParseNode(retval, args);
}
public String GetNameText(NamePtg namePtg)
{
return _iBook.GetNameRecord(namePtg.Index).NameText;
}
/**
* Note - Excel function names are 'case aware but not case sensitive'. This method may end
* up creating a defined name record in the workbook if the specified name Is not an internal
* Excel function, and has not been encountered before.
*
* @param name case preserved function name (as it was entered/appeared in the formula).
*/
private ParseNode function(String name)
{
NamePtg nameToken = null;
// Note regarding parameter -
if (!AbstractFunctionPtg.IsInternalFunctionName(name))
{
// external functions Get a Name Token which points To a defined name record
nameToken = new NamePtg(name, this.book);
// in the Token tree, the name Is more or less the first argument
}
Match('(');
ParseNode[] args = Arguments();
Match(')');
return GetFunction(name, nameToken, args);
}
