@Override
public MoveResult applyMove(
Equation equation, int moveNum, List<Operation> operations, Operation appliedOrNull) {
Expression lhs = equation.getLhs();
Expression rhs = equation.getRhs();
int num = 0;
Expression lhsResult = factor(lhs);
if (lhsResult != null) {
num++;
}
Expression rhsResult = factor(rhs);
if (rhsResult != null) {
num++;
}
if (num == 1) {
Expression zero = new Expression(0);
if (lhs.isZero()) {
String factored = "0 = (" + rhsResult + ")(" + expr + ")";
return new MoveResult( //
new MultipleSolutionMove(
equation, (appliedOrNull == null ? this : appliedOrNull), factored, moveNum), //
new SecondaryEquationMove(new Equation(zero, rhsResult), 1), //
new SecondaryEquationMove(new Equation(zero, expr), 2));
}
if (rhs.isZero()) {
String factored = "(" + lhsResult + ")(" + expr + ") = 0";
return new MoveResult( //
new MultipleSolutionMove(
equation, (appliedOrNull == null ? this : appliedOrNull), factored, moveNum), //
new SecondaryEquationMove(new Equation(lhsResult, zero), 1), //
new SecondaryEquationMove(new Equation(expr, zero), 2));
}
}
StringBuilder builder = new StringBuilder();
if (lhsResult != null) {
builder.append("(");
builder.append(lhsResult);
builder.append(")(");
builder.append(expr);
builder.append(")");
} else {
builder.append(lhs);
}
builder.append(" = ");
if (rhsResult != null) {
builder.append("(");
builder.append(rhsResult);
builder.append(")(");
builder.append(expr);
builder.append(")");
} else {
builder.append(rhs);
}
FormattedMove move =
new FormattedMove(
equation, (appliedOrNull == null ? this : appliedOrNull), builder.toString(), moveNum);
return new MoveResult(move);
}
@Override
public boolean canApply(Equation equation) {
return canApply(equation.getLhs()) || canApply(equation.getRhs());
}