/**
* this method removes the last element of the formula, and returns whether the element removed is
* an operator or an input:
*
* @return true if it is an operator, false otherwise
* @exception SyntaxErrorException TO COMMENT FURTHER
*/
public boolean removeFromFormula() throws SyntaxErrorException {
boolean isOperator = true;
TreeCell currentCell;
if (nextEntry == 0) // only one value
{
currentCell = opList.get(0);
} else if ((nextEntry < opList.size())
&& (opList.get(nextEntry).getstatusCell() != TreeCell.NOT_COMPLETED)) {
currentCell = opList.get(nextEntry);
} else {
currentCell = opList.get(nextEntry - 1); // get the current cell that we will be using
}
try {
isOperator = currentCell.removeInCell();
if (!isOperator) this.removeLeaveTotal();
if (currentCell.getstatusCell() == TreeCell.NOT_COMPLETED) {
if (nextEntry > 0) nextEntry--;
if (nextEntry < opList.size()) opList.remove(currentCell);
} else if ((currentCell.getstatusCell() == TreeCell.LEFT_COMPLETED))
nextEntry = this.opList.size();
else if (nextEntry < opList.size()) {
nextEntry++;
}
return isOperator;
} catch (SyntaxErrorException e) {
throw e;
}
}
/**
* 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 toAdd the information to add to the Formula : either operator or inputs
* @exception SyntaxErrorException: this exception is thrown if the method is called trying to add
* an input where the last entry in the formula is an input already, or an operator following
* another operator. it also throws the exception if the first operator added is * or / and no
* inputs have been entered before. those are all errors that are dealt with in the AMT code,
* and the method should never be called in those instances.
*/
public void addToFormula(String toAdd) throws SyntaxErrorException {
if (toAdd.length() == 1) {
addToFormula(toAdd.charAt(0));
return;
}
// 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 {
currentCell.addInputInCell(toAdd);
if ((currentCell.getstatusCell() == TreeCell.RIGHT_COMPLETED)
&& ((currentCell.getcellValue().length() > 1))) nextEntry++;
if ((currentCell.getstatusCell() == TreeCell.RIGHT_COMPLETED)
&& ((currentCell.getcellValue().length() == 1))
&& (currentCell.getrightSon() != null)) nextEntry++;
this.addLeaveTotal();
} catch (SyntaxErrorException e) {
throw e;
}
}
/**
* Method exists to remove the value in the Cell
*
* @exception SytaxErrorException: thrown if -the cell's status is NOT_COMPLETED -the cell is
* RIGHT_COMPLETED, the right is null, and the cellValue is a math operator
* @returns true if a value can be removed, or false if a math operator is in the cell
*/
public boolean removeInCell() throws SyntaxErrorException {
SyntaxErrorException e = null;
switch (status) {
case NOT_COMPLETED:
Logger.getLogger()
.concatOut(
amt.log.Logger.DEBUG,
"Formula",
"SyntaxErrorException: try to remove a cell which is void, method fails");
e.fillInStackTrace();
throw e;
case LEFT_COMPLETED:
if (this.getleftSon() == null) {
// we are in a cell that only has either an operator + or -, or an input
if (this.cellValue.length() > 1) {
// the element to remove is an input
this.cellValue = null;
status = NOT_COMPLETED;
return false;
} else if ((this.cellValue.charAt(0) != '*') && (this.cellValue.charAt(0) != '/')) {
// there might be something else in the right son that needs to be removed.
if (rightSon == null) {
// the element to remove is an operator
this.cellValue = null;
status = NOT_COMPLETED;
return true;
} else {
TreeCell currentCell = rightSon;
boolean res = currentCell.removeInCell();
if (currentCell.getstatusCell() == NOT_COMPLETED) {
rightSon = null;
this.status = LEFT_COMPLETED;
}
return res;
}
} else {
this.cellValue = null;
status = NOT_COMPLETED;
return true;
}
} else if (this.rightSon != null) {
swapWithInputs();
return true;
} else {
// the element to remove is an operator, and there is something in the left-son, the cell
// is taken away and the content of the son is put one up
swapWithLeftSon();
return true;
}
case RIGHT_COMPLETED:
if (this.getrightSon() == null) {
// this should be a leaf, containning an input only
if (this.cellValue.length() > 1) {
// the element to remove is an input
this.cellValue = null;
status = NOT_COMPLETED;
return false;
} else {
Logger.getLogger()
.concatOut(
amt.log.Logger.DEBUG,
"Formula",
"SyntaxErrorException: try to remove an input in an operator "
+ this.cellValue
+ " cell");
e.fillInStackTrace();
throw e;
}
} else {
boolean res = this.rightSon.removeInCell();
if (rightSon.status == NOT_COMPLETED) {
rightSon = null;
}
this.status = LEFT_COMPLETED;
return res;
}
}
return false;
}
/**
* 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());
}
/*
* Checks if formula made matches a passed formula
* @param correctFormula: The formula to be compared
*/
public boolean checkFormulaCorrect(Formula correctFormula) {
Formula goodF, userF;
try {
goodF = new Formula(correctFormula);
userF = new Formula(this);
if (goodF.opList.size() > 0) {
TreeCell firstCell = goodF.opList.get(0);
if ((firstCell.getcellValue().length() > 1)
|| (firstCell.getcellValue().charAt(0) == '*')
|| (firstCell.getcellValue().charAt(0) == '/')) {
TreeCell topCell = new TreeCell("+");
topCell.setleftSon(null);
topCell.setrightSon(firstCell);
if (firstCell.getstatusCell() == TreeCell.RIGHT_COMPLETED)
topCell.setstatusCell(TreeCell.RIGHT_COMPLETED);
else topCell.setstatusCell(TreeCell.LEFT_COMPLETED);
goodF.opList.set(0, topCell);
}
}
if (userF.opList.size() > 0) {
TreeCell firstCell = userF.opList.get(0);
if ((firstCell.getcellValue().length() > 1)
|| (firstCell.getcellValue().charAt(0) == '*')
|| (firstCell.getcellValue().charAt(0) == '/')) {
TreeCell topCell = new TreeCell("+");
topCell.setleftSon(null);
topCell.setrightSon(firstCell);
if (firstCell.getstatusCell() == TreeCell.RIGHT_COMPLETED)
topCell.setstatusCell(TreeCell.RIGHT_COMPLETED);
else topCell.setstatusCell(TreeCell.LEFT_COMPLETED);
userF.opList.set(0, topCell);
}
}
/*System.out.println("the formulas after init");
System.out.println(userF.FormulaToString());
System.out.println(goodF.FormulaToString());*/
boolean opChecked[] = new boolean[userF.nextEntry];
boolean opCheckedCorrect = false;
// compare the number of leaves: if not identical we know it is not good.
if (userF.nb_leaves != goodF.nb_leaves) {
// System.out.println("nbLeaves not equal");
return false;
}
// if the two formulas do not have the same number of top operators, we know it is not good.
else if (userF.opList.size() != goodF.opList.size()) {
// System.out.println("size of opList not equal");
return false;
} else {
// System.out.println("first tests passed");
for (int i = 0; i < goodF.opList.size(); i++) {
String correctvalue = goodF.opList.get(i).getcellValue();
// System.out.println("test of operator: "+ correctvalue);
if (correctvalue.length() == 1) {
opCheckedCorrect = false;
for (int j = 0; j < userF.opList.size(); j++) {
if ((!opCheckedCorrect) && (!opChecked[j])) {
String currentValue = userF.opList.get(j).getcellValue();
// System.out.println("test of user operator: "+ currentValue+ "" + j);
if (correctvalue.equals(currentValue)) {
// System.out.println("test of the cells:");
// System.out.println("user"+ userF.opList.get(j).turnToString());
// System.out.println("user"+ goodF.opList.get(i).turnToString());
if (userF.opList.get(j).cellCorrect(goodF.opList.get(i))) {
// System.out.println("this cell is correct");
opChecked[j] = true;
opCheckedCorrect = true;
}
}
}
}
if (!opCheckedCorrect) return false;
}
}
return true;
}
} catch (SyntaxErrorException ex) {
java.util.logging.Logger.getLogger(Formula.class.getName()).log(Level.SEVERE, null, ex);
}
return false;
}