/**
* This method exists to make it easier to see when and where classes are changing the formula
* This also serves another purpose by adding spaces and formatting when needed, something that
* the normal setFormula() method cannot do.
*
* @param op
*/
public void addToFormula(char op) throws SyntaxErrorException {
// if the cell to add the operator in does not exist yet, create it
if ((opList == null) || (nextEntry >= opList.size())) opList.add(new TreeCell());
TreeCell currentCell = opList.get(nextEntry); // get the current cell that we will be using
try {
if (((op == '/') || (op == '*')) && (nextEntry > 0)) {
if ((opList.get(nextEntry).getleftSon() == null)
&& (opList.get(nextEntry - 1).getcellValue().length() == 1)) {
opList.remove(nextEntry);
nextEntry--;
currentCell = opList.get(nextEntry);
currentCell.addOpAndReform(op);
} else if ((opList.get(nextEntry).getcellValue() == null)
&& (opList.get(nextEntry - 1).getcellValue().length() >= 1)) {
// this is the first operator to be entered, the first entry being an input.
opList.remove(nextEntry);
nextEntry--;
currentCell = opList.get(nextEntry);
currentCell.setleftSon(new TreeCell(currentCell.getcellValue()));
currentCell.setrightSon(null);
currentCell.setcellValue(op + "");
currentCell.setstatusCell(TreeCell.LEFT_COMPLETED);
}
} else {
currentCell.addOpInCell(op);
}
} catch (SyntaxErrorException e) {
throw e;
}
}
/**
* method will set the current cell to all the values of the leftSon, causing the leftSon to
* replace the currentCell
*/
public void swapWithLeftSon() {
setrightSon(leftSon.getrightSon());
setcellValue(leftSon.getcellValue());
setstatusCell(leftSon.getstatusCell());
setleftSon(leftSon.getleftSon());
}