public override INameInfo GetName(string worksheet, string name)
{
ExcelNamedRange nameItem;
ulong id;
ExcelWorksheet ws;
if (string.IsNullOrEmpty(worksheet))
{
if (_package.Workbook.Names.ContainsKey(name))
{
nameItem = _package.Workbook.Names[name];
}
else
{
return(null);
}
ws = null;
}
else
{
ws = _package.Workbook.Worksheets[worksheet];
if (ws != null && ws.Names.ContainsKey(name))
{
nameItem = ws.Names[name];
}
else if (_package.Workbook.Names.ContainsKey(name))
{
nameItem = _package.Workbook.Names[name];
}
else
{
return(null);
}
}
id = ExcelAddress.GetCellID(nameItem.LocalSheetID, nameItem.Index, 0);
if (_names.ContainsKey(id))
{
return(_names[id]);
}
else
{
var ni = new NameInfo()
{
Id = id,
Name = name,
Worksheet = nameItem.LocalSheet?.Name,
Formula = nameItem.NameFormula
};
var range = nameItem.GetFormulaAsCellRange();
if (range == null)
{
ni.Value = nameItem.NameFormula;
}
else
{
ni.Value = new RangeInfo(range.Worksheet ?? ws, range);
}
_names.Add(id, ni);
return(ni);
}
}
/// <summary>
/// This method follows the calculation chain to get the order of the calculation
/// Goto (!) is used internally to prevent stackoverflow on extremly large dependency trees (that is, many recursive formulas).
/// </summary>
/// <param name="depChain">The dependency chain object</param>
/// <param name="lexer">The formula tokenizer</param>
/// <param name="wb">The workbook where the formula comes from</param>
/// <param name="ws">The worksheet where the formula comes from</param>
/// <param name="f">The cell function object</param>
/// <param name="options">Calcultaiton options</param>
private static void FollowChain(DependencyChain depChain, ILexer lexer, ExcelWorkbook wb, ExcelWorksheet ws, FormulaCell f, ExcelCalculationOption options)
{
Stack <FormulaCell> stack = new Stack <FormulaCell>();
iterateToken:
while (f.tokenIx < f.Tokens.Count)
{
var t = f.Tokens[f.tokenIx];
if (t.TokenType == TokenType.ExcelAddress)
{
var adr = new ExcelFormulaAddress(t.Value);
if (adr.IsTableAddress)
{
adr.SetRCFromTable(ws.Package, new ExcelAddress(f.Row, f.Column, f.Row, f.Column));
}
if (adr.WorkSheet == null && adr.Collide(new ExcelAddress(f.Row, f.Column, f.Row, f.Column)) != ExcelAddress.eAddressCollition.No && !options.AllowCircularReferences)
{
throw (new CircularReferenceException(string.Format("Circular Reference in cell {0}", ExcelAddress.GetAddress(f.Row, f.Column))));
}
if (adr._fromRow > 0 && adr._fromCol > 0)
{
if (string.IsNullOrEmpty(adr.WorkSheet))
{
if (f.ws == null)
{
f.ws = ws;
}
else if (f.ws.SheetID != f.SheetID)
{
f.ws = wb.Worksheets.GetBySheetID(f.SheetID);
}
}
else
{
f.ws = wb.Worksheets[adr.WorkSheet];
}
if (f.ws != null)
{
f.iterator = f.ws._formulas.GetEnumerator(adr.Start.Row, adr.Start.Column, adr.End.Row, adr.End.Column);
goto iterateCells;
}
}
}
else if (t.TokenType == TokenType.NameValue)
{
ExcelNamedRange name = null;
var worksheet = f.ws ?? ws;
// Worksheet-scoped named ranges take precedence over workbook-scoped named ranges.
if (worksheet?.Names?.ContainsKey(t.Value) == true)
{
name = worksheet.Names[t.Value];
}
else if (wb.Names.ContainsKey(t.Value))
{
name = wb.Names[t.Value];
}
if (name != null)
{
var nameFormulaTokens = name.GetRelativeNameFormula(f.Row, f.Column)?.ToList();
if (nameFormulaTokens.Count == 0 && !string.IsNullOrEmpty(name.NameFormula))
{
nameFormulaTokens = name.Workbook.FormulaParser.Lexer.Tokenize(name.NameFormula)?.ToList();
}
// Remove the current named range token and replace it with the named range's formula.
f.Tokens.RemoveAt(f.tokenIx);
f.Tokens.InsertRange(f.tokenIx, nameFormulaTokens);
goto iterateToken;
}
}
else if (t.TokenType == TokenType.Function && t.Value.IsEquivalentTo(Offset.Name))
{
var stringBuilder = new StringBuilder($"{OffsetAddress.Name}(");
int offsetStartIndex = f.tokenIx;
int parenCount = 1;
for (f.tokenIx += 2; parenCount > 0 && f.tokenIx < f.Tokens.Count; f.tokenIx++)
{
var token = f.Tokens[f.tokenIx];
stringBuilder.Append(token.Value);
if (token.TokenType == TokenType.OpeningParenthesis)
{
parenCount++;
}
else if (token.TokenType == TokenType.ClosingParenthesis)
{
parenCount--;
}
}
ExcelRange cell = ws.Cells[f.Row, f.Column];
string originalFormula = cell.Formula;
string addressOffsetFormula = stringBuilder.ToString();
stringBuilder.Clear();
for (int i = 0; i < f.Tokens.Count; i++)
{
if (i == offsetStartIndex)
{
stringBuilder.Append(0);
}
else if (i < offsetStartIndex || i >= f.tokenIx)
{
stringBuilder.Append(f.Tokens[i].Value);
}
}
cell.Formula = stringBuilder.ToString();
var offsetResult = ws.Calculate(addressOffsetFormula, f.Row, f.Column);
cell.Formula = originalFormula;
if (offsetResult is string resultString)
{
ExcelAddress adr = new ExcelAddress(resultString);
var worksheet = string.IsNullOrEmpty(adr.WorkSheet) ? ws : wb.Worksheets[adr.WorkSheet];
// Only complete the OFFSET's dependency chain if a valid existing address was successfully parsed.
if (worksheet != null)
{
f.Tokens.RemoveRange(offsetStartIndex, f.tokenIx - offsetStartIndex);
var offsetResultTokens = wb.FormulaParser.Lexer.Tokenize(adr.FullAddress);
f.Tokens.InsertRange(offsetStartIndex, offsetResultTokens);
f.ws = worksheet;
f.iterator = f.ws._formulas.GetEnumerator(adr.Start.Row, adr.Start.Column, adr.End.Row, adr.End.Column);
goto iterateCells;
}
}
}
f.tokenIx++;
}
depChain.CalcOrder.Add(f.Index);
if (stack.Count > 0)
{
f = stack.Pop();
goto iterateCells;
}
return;
iterateCells:
while (f.iterator != null && f.iterator.MoveNext())
{
var v = f.iterator.Value;
if (v == null || v.ToString().Trim() == "")
{
continue;
}
var id = ExcelAddress.GetCellID(f.ws.SheetID, f.iterator.Row, f.iterator.Column);
if (!depChain.Index.ContainsKey(id))
{
var rf = new FormulaCell()
{
SheetID = f.ws.SheetID, Row = f.iterator.Row, Column = f.iterator.Column
};
if (f.iterator.Value is int)
{
rf.Formula = f.ws._sharedFormulas[(int)v].GetFormula(f.iterator.Row, f.iterator.Column, ws.Name);
}
else
{
rf.Formula = v.ToString();
}
rf.ws = f.ws;
rf.Tokens = lexer.Tokenize(rf.Formula, f.ws.Name).ToList();
ws._formulaTokens.SetValue(rf.Row, rf.Column, rf.Tokens);
depChain.Add(rf);
stack.Push(f);
f = rf;
goto iterateToken;
}
else
{
if (stack.Count > 0)
{
//Check for circular references
foreach (var par in stack)
{
if (ExcelAddress.GetCellID(par.ws.SheetID, par.iterator.Row, par.iterator.Column) == id ||
ExcelAddress.GetCellID(par.ws.SheetID, par.Row, par.Column) == id)
{
if (options.AllowCircularReferences == false)
{
throw (new CircularReferenceException(string.Format("Circular Reference in cell {0}!{1}", par.ws.Name, ExcelAddress.GetAddress(f.Row, f.Column))));
}
else
{
f = stack.Pop();
goto iterateCells;
}
}
}
}
}
}
f.tokenIx++;
goto iterateToken;
}