public ValueEval Evaluate(ValueEval[] args, int srcCellRow, int srcCellCol)
{
ValueEval arg3 = null;
switch (args.Length)
{
case 4:
arg3 = args[3]; // important: assumed array element Is never null
break;
case 3:
break;
default:
// wrong number of arguments
return(ErrorEval.VALUE_INVALID);
}
try
{
// Evaluation order:
// arg0 lookup_value, arg1 table_array, arg3 range_lookup, Find lookup value, arg2 row_index, fetch result
ValueEval lookupValue = OperandResolver.GetSingleValue(args[0], srcCellRow, srcCellCol);
AreaEval tableArray = LookupUtils.ResolveTableArrayArg(args[1]);
bool IsRangeLookup = LookupUtils.ResolveRangeLookupArg(arg3, srcCellRow, srcCellCol);
int colIndex = LookupUtils.LookupIndexOfValue(lookupValue, LookupUtils.CreateRowVector(tableArray, 0), IsRangeLookup);
int rowIndex = LookupUtils.ResolveRowOrColIndexArg(args[2], srcCellRow, srcCellCol);
ValueVector resultCol = CreateResultColumnVector(tableArray, rowIndex);
return(resultCol.GetItem(colIndex));
}
catch (EvaluationException e)
{
return(e.GetErrorEval());
}
}
public override ValueEval Evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0, ValueEval arg1,
ValueEval arg2, ValueEval arg3)
{
try
{
// Evaluation order:
// arg0 lookup_value, arg1 table_array, arg3 range_lookup, find lookup value, arg2 col_index, fetch result
ValueEval lookupValue = OperandResolver.GetSingleValue(arg0, srcRowIndex, srcColumnIndex);
AreaEval tableArray = LookupUtils.ResolveTableArrayArg(arg1);
bool isRangeLookup = LookupUtils.ResolveRangeLookupArg(arg3, srcRowIndex, srcColumnIndex);
int rowIndex = LookupUtils.LookupIndexOfValue(lookupValue, LookupUtils.CreateColumnVector(tableArray, 0), isRangeLookup);
int colIndex = LookupUtils.ResolveRowOrColIndexArg(arg2, srcRowIndex, srcColumnIndex);
ValueVector resultCol = CreateResultColumnVector(tableArray, colIndex);
return(resultCol.GetItem(rowIndex));
}
catch (EvaluationException e)
{
return(e.GetErrorEval());
}
}
public ValueEval Evaluate(ValueEval[] args, int srcCellRow, int srcCellCol)
{
switch (args.Length)
{
case 3:
break;
case 2:
// complex rules to choose lookupVector and resultVector from the single area ref
throw new Exception("Two arg version of LOOKUP not supported yet");
default:
return(ErrorEval.VALUE_INVALID);
}
try
{
ValueEval lookupValue = OperandResolver.GetSingleValue(args[0], srcCellRow, srcCellCol);
AreaEval aeLookupVector = LookupUtils.ResolveTableArrayArg(args[1]);
AreaEval aeResultVector = LookupUtils.ResolveTableArrayArg(args[2]);
ValueVector lookupVector = CreateVector(aeLookupVector);
ValueVector resultVector = CreateVector(aeResultVector);
if (lookupVector.Size > resultVector.Size)
{
// Excel seems to handle this by accessing past the end of the result vector.
throw new Exception("Lookup vector and result vector of differing sizes not supported yet");
}
int index = LookupUtils.LookupIndexOfValue(lookupValue, lookupVector, true);
return(resultVector.GetItem(index));
}
catch (EvaluationException e)
{
return(e.GetErrorEval());
}
}