/**
* Generates the variable function ptg for the formula.
*
* <p>For IF Formulas, additional PTGs are added to the tokens
*
* @param name a {@link NamePtg} or {@link NameXPtg} or <code>null</code>
* @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, Ptg namePtg, ParseNode[] args) {
FunctionMetadata fm = FunctionMetadataRegistry.getFunctionByName(name.toUpperCase());
int numArgs = args.length;
if (fm == null) {
if (namePtg == null) {
throw new IllegalStateException("NamePtg must be supplied for external functions");
}
// must be external function
ParseNode[] allArgs = new ParseNode[numArgs + 1];
allArgs[0] = new ParseNode(namePtg);
System.arraycopy(args, 0, allArgs, 1, numArgs);
return new ParseNode(FuncVarPtg.create(name, numArgs + 1), allArgs);
}
if (namePtg != null) {
throw new IllegalStateException("NamePtg no applicable to internal functions");
}
boolean isVarArgs = !fm.hasFixedArgsLength();
int funcIx = fm.getIndex();
if (funcIx == FunctionMetadataRegistry.FUNCTION_INDEX_SUM && args.length == 1) {
// Excel encodes the sum of a single argument as tAttrSum
// POI does the same for consistency, but this is not critical
return new ParseNode(AttrPtg.getSumSingle(), args);
// The code below would encode tFuncVar(SUM) which seems to do no harm
}
validateNumArgs(args.length, fm);
AbstractFunctionPtg retval;
if (isVarArgs) {
retval = FuncVarPtg.create(name, numArgs);
} else {
retval = FuncPtg.create(funcIx);
}
return new ParseNode(retval, args);
}
/** @return <code>true</code> if the specified name is a valid cell reference */
private boolean isValidCellReference(String str) {
// check range bounds against grid max
boolean result = CellReference.classifyCellReference(str, _ssVersion) == NameType.CELL;
if (result) {
/**
* Check if the argument is a function. Certain names can be either a cell reference or a
* function name depending on the contenxt. Compare the following examples in Excel 2007: (a)
* LOG10(100) + 1 (b) LOG10 + 1 In (a) LOG10 is a name of a built-in function. In (b) LOG10 is
* a cell reference
*/
boolean isFunc = FunctionMetadataRegistry.getFunctionByName(str.toUpperCase()) != null;
if (isFunc) {
int savePointer = _pointer;
resetPointer(_pointer + str.length());
SkipWhite();
// open bracket indicates that the argument is a function,
// the returning value should be false, i.e. "not a valid cell reference"
result = look != '(';
resetPointer(savePointer);
}
}
return result;
}