public override double VisitIdentifierExpression(ExpressionGrammarParser.IdentifierExpressionContext context)
{
var result = context.GetText();
string letters = "";
int i = 0;
while (Char.IsLetter(result[i]))
{
letters += result[i];
i++;
}
int numbers = Convert.ToInt32(result.Substring(i));
// get DataGridView
var dgv = Program.form1.getDataGridView();
// update variable dependencies - send selected cells to the ones that they use
int currentRow = Program.form1.CurrentRow; // get row of cell for which we calculate the expression
int currentCol = Program.form1.CurrentColumn; // get col of cell for which we calculate the expression
// MessageBox.Show("Current row for which we calculate the expression:" + dgv.Columns[currentCol].Name + dgv.Rows[currentRow].HeaderCell.Value);
MyCell cell = (MyCell)dgv.Rows[currentRow].Cells[currentCol]; // get cell
// get cell name in Excel terms
string colName = dgv.Columns[cell.ColumnIndex].HeaderText;
string rowName = cell.RowIndex.ToString();
// MessageBox.Show("TRY to add variable dependency:" + (colName + rowName) + " to " + (letters + numbers.ToString()));
//check to prevent adding redundant cells to hashsets (A-B-C type of connection mustn't create A-C link)
if (((MyCell)(dgv.Rows[currentRow].Cells[currentCol])).Expression.Contains(letters + numbers))
{
// MessageBox.Show("added variable dependency:" + (colName + rowName) + " to " + (letters + numbers.ToString()));
// add it as a cell to visit while checking recursion
((MyCell)(dgv.Rows[numbers].Cells[letters])).Variables.Add(colName + rowName);
}
try
{
/*if (((letters + numbers.ToString()) != (colName + rowName))
* && !(RecurChecker.Check((MyCell)dgv.Rows[numbers].Cells[letters], letters + numbers, new HashSet<string>()))
* )
*/
if (!(RecurChecker.Check((MyCell)dgv.Rows[numbers].Cells[letters], letters + numbers, new HashSet <string>())))
{
// MessageBox.Show("Recur checker OK");
// MessageBox.Show("Expression: " + ((MyCell)dgv.Rows[numbers].Cells[letters]).Expression);
Program.form1.CurrentRow = numbers;
int tmp;
Program.form1.getColNameToColIndex().TryGetValue(letters, out tmp);
Program.form1.CurrentColumn = tmp;
return(Convert.ToDouble(Calculator.Evaluate(((MyCell)dgv.Rows[numbers].Cells[letters]).Expression)));
}
else
{
throw new Exception("Cycles detected!");
}
}
catch (Exception e)
{
MessageBox.Show(e.Message, "Cycles!", MessageBoxButtons.OK, MessageBoxIcon.Error);
return(0);
}
}
public static bool Check(MyCell currentCell, string currentVar, HashSet <string> vars)
{
try
{
/*
* MessageBox.Show("inside recur checker");
* MessageBox.Show("current var:" + currentVar);
* string variablesInVars = "";
* foreach (string var in vars)
* {
* variablesInVars += var + " ";
* }
* MessageBox.Show(variablesInVars);
*/
HashSet <string> tmp = new HashSet <string>(vars);
tmp.IntersectWith(currentCell.Variables);
if (tmp.Count != 0)
{
return(true);
}
vars.Add(currentVar);
HashSet <string> cellsToGo = currentCell.Variables;
bool f = false;
foreach (string cellName in cellsToGo)
{
string letters = "";
int i = 0;
while (Char.IsLetter(cellName[i]))
{
letters += cellName[i];
i++;
}
int numbers = Convert.ToInt32(cellName.Substring(i));
if (!f)
{
f = f || Check((MyCell)Program.form1.getDataGridView().Rows[numbers].Cells[letters], cellName, vars);
}
}
return(f);
}
catch (StackOverflowException e)
{
MessageBox.Show("Stack overflow! Recursion use I see indeed.");
return(true);
}
}