76 lines
2.3 KiB
Java
76 lines
2.3 KiB
Java
/*
|
|
SETTINGS: (please don't move this part)
|
|
PATH=ExpandRule5
|
|
*/
|
|
|
|
import org.warp.picalculator.math.Function;
|
|
import org.warp.picalculator.math.FunctionOperator;
|
|
import org.warp.picalculator.math.FunctionDynamic;
|
|
import org.warp.picalculator.math.FunctionSingle;
|
|
import org.warp.picalculator.math.MathContext;
|
|
|
|
import org.warp.picalculator.Error;
|
|
import org.warp.picalculator.math.functions.Number;
|
|
import org.warp.picalculator.math.functions.Expression;
|
|
import org.warp.picalculator.math.functions.Multiplication;
|
|
import org.warp.picalculator.math.functions.Negative;
|
|
import org.warp.picalculator.math.functions.Subtraction;
|
|
import org.warp.picalculator.math.rules.Rule;
|
|
import org.warp.picalculator.math.rules.RuleType;
|
|
|
|
import it.unimi.dsi.fastutil.objects.ObjectArrayList;
|
|
|
|
/**
|
|
* Expand rule
|
|
* -(-a) = a
|
|
*
|
|
* @author Andrea Cavalli
|
|
*
|
|
*/
|
|
public class ExpandRule5 implements Rule {
|
|
// Rule name
|
|
@Override
|
|
public String getRuleName() {
|
|
return "ExpandRule5";
|
|
}
|
|
|
|
// Rule type
|
|
@Override
|
|
public RuleType getRuleType() {
|
|
return RuleType.EXPANSION;
|
|
}
|
|
|
|
/* Rule function
|
|
Returns:
|
|
- null if it's not executable on the function "f"
|
|
- An ObjectArrayList<Function> if it did something
|
|
*/
|
|
@Override
|
|
public ObjectArrayList<Function> execute(Function f) {
|
|
boolean isExecutable = false;
|
|
if (f instanceof Negative) {
|
|
isExecutable = ((FunctionSingle)f).getParameter() instanceof Negative;
|
|
} else if (f instanceof Multiplication) {
|
|
if (((FunctionOperator)f).getParameter1().equals(new Number(f.getMathContext(), -1)) && ((FunctionOperator)f).getParameter2() instanceof Multiplication) {
|
|
isExecutable = ((FunctionOperator)((FunctionOperator)f).getParameter2()).getParameter1().equals(((FunctionOperator)f).getParameter1());
|
|
}
|
|
}
|
|
|
|
if (isExecutable) {
|
|
ObjectArrayList<Function> result = new ObjectArrayList<>();
|
|
|
|
if (f instanceof Negative) {
|
|
Negative fnc = (Negative) f;
|
|
result.add(((FunctionSingle)((FunctionSingle)fnc.getParameter()).getParameter()).getParameter());
|
|
} else if (f instanceof Multiplication) {
|
|
FunctionOperator fnc = (FunctionOperator) f;
|
|
result.add(((FunctionOperator)fnc.getParameter2()).getParameter2());
|
|
}
|
|
return result;
|
|
} else {
|
|
return null;
|
|
}
|
|
}
|
|
|
|
}
|