136 lines
4.2 KiB
Java
136 lines
4.2 KiB
Java
/*
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SETTINGS: (please don't move this part)
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PATH=ExpandRule2
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*/
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import org.warp.picalculator.math.Function;
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import org.warp.picalculator.math.FunctionOperator;
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import org.warp.picalculator.math.MathContext;
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import it.unimi.dsi.fastutil.objects.ObjectArrayList;
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import org.warp.picalculator.math.rules.Rule;
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import org.warp.picalculator.math.rules.RuleType;
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import org.warp.picalculator.math.functions.Multiplication;
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import org.warp.picalculator.math.functions.Sum;
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import org.warp.picalculator.math.functions.Subtraction;
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import org.warp.picalculator.math.functions.SumSubtraction;
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import org.warp.picalculator.math.functions.Number;
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/**
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* Expand rule
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* -(-a) = a
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*
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* @author Andrea Cavalli
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*
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*/
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public class ExpandRule2 implements Rule {
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// Rule name
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@Override
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public String getRuleName() {
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return "ExpandRule2";
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}
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// Rule type
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@Override
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public RuleType getRuleType() {
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return RuleType.EXPANSION;
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}
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/* Rule function
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Returns:
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- null if it's not executable on the function "f"
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- An ObjectArrayList<Function> if it did something
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*/
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@Override
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public ObjectArrayList<Function> execute(Function f) {
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boolean isExecutable = false;
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if (f instanceof Multiplication) {
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FunctionOperator fnc = (FunctionOperator) f;
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if (fnc.getParameter1().equals(new Number(fnc.getMathContext(), -1))) {
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Function expr = fnc.getParameter2();
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if (expr instanceof Sum) {
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isExecutable = true;
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} else if (expr instanceof Subtraction) {
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isExecutable = true;
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} else if (expr instanceof SumSubtraction) {
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isExecutable = true;
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}
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}
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} else if (f instanceof Subtraction || f instanceof SumSubtraction) {
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FunctionOperator fnc = (FunctionOperator) f;
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Function expr = fnc.getParameter2();
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if (expr instanceof Sum) {
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isExecutable = true;
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} else if (expr instanceof Subtraction) {
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isExecutable = true;
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} else if (expr instanceof SumSubtraction) {
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isExecutable = true;
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}
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}
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if (isExecutable) {
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ObjectArrayList<Function> result = new ObjectArrayList<>();
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MathContext root = f.getMathContext();
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Function expr = null;
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int fromSubtraction = 0;
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Function subtraction = null;
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if (f instanceof Multiplication) {
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expr = ((FunctionOperator) f).getParameter2();
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} else if (f instanceof Subtraction || f instanceof SumSubtraction) {
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expr = ((FunctionOperator) f).getParameter2();
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if (f instanceof Subtraction) {
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fromSubtraction = 1;
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} else {
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fromSubtraction = 2;
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}
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}
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if (f instanceof SumSubtraction) {
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}
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FunctionOperator fnc = (FunctionOperator) expr;
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if (fnc instanceof Sum) {
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Function a = fnc.getParameter1();
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Function b = fnc.getParameter2();
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Function fnc2 = new Subtraction(root, new Multiplication(root, new Number(root, -1), a), b);
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if (fromSubtraction > 0) {
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subtraction = new Subtraction(root, ((FunctionOperator)f).getParameter1(), fnc2);
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result.add(subtraction);
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} else {
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result.add(fnc2);
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}
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} else if (fnc instanceof Subtraction) {
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Function a = fnc.getParameter1();
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Function b = fnc.getParameter2();
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Function fnc2 = new Sum(root, new Multiplication(root, new Number(root, -1), a), b);
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if (fromSubtraction > 0) {
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subtraction = new Subtraction(root, ((FunctionOperator)f).getParameter1(), fnc2);
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result.add(subtraction);
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} else {
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result.add(fnc2);
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}
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} else if (fnc instanceof SumSubtraction) {
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Function a = fnc.getParameter1();
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Function b = fnc.getParameter2();
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Function fnc2 = new Sum(root, new Multiplication(root, new Number(root, -1), a), b);
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Function fnc3 = new Subtraction(root, new Multiplication(root, new Number(root, -1), a), b);
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if (fromSubtraction > 0) {
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subtraction = new SumSubtraction(root, ((FunctionOperator)f).getParameter1(), fnc2);
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result.add(subtraction);
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subtraction = new SumSubtraction(root, ((FunctionOperator)f).getParameter1(), fnc3);
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result.add(subtraction);
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result.add(subtraction);
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} else {
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result.add(fnc2);
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result.add(fnc2);
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}
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}
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return result;
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} else {
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return null;
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}
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}
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}
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