47 lines
1.8 KiB
Java
47 lines
1.8 KiB
Java
package it.cavallium.warppi.math.parser.steps;
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import it.cavallium.warppi.math.Function;
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import it.cavallium.warppi.math.functions.Subtraction;
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import it.cavallium.warppi.math.functions.Sum;
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import it.cavallium.warppi.math.functions.SumSubtraction;
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import it.cavallium.warppi.math.parser.MathParserStep;
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import it.cavallium.warppi.util.Error;
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import it.cavallium.warppi.util.Errors;
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import it.cavallium.warppi.util.IntWrapper;
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import it.unimi.dsi.fastutil.objects.ObjectArrayList;
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public class FixSumsAndSubtractions implements MathParserStep {
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@Override
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public boolean eval(final IntWrapper curIndex, final Function lastFunction, final Function currentFunction,
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final ObjectArrayList<Function> functionsList) throws Error {
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if (currentFunction instanceof Sum || currentFunction instanceof Subtraction || currentFunction instanceof SumSubtraction) {
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if (currentFunction.getParameter(0) == null && currentFunction.getParameter(1) == null) {
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if (curIndex.i - 1 >= 0 && curIndex.i + 1 < functionsList.size()) {
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final Function next = functionsList.get(curIndex.i + 1);
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final Function prev = functionsList.get(curIndex.i - 1);
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functionsList.set(curIndex.i, currentFunction.setParameter(0, prev).setParameter(1, next));
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functionsList.remove(curIndex.i + 1);
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functionsList.remove(curIndex.i - 1);
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curIndex.i--;
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return true;
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} else if (currentFunction.getParameter(0) == null || currentFunction.getParameter(1) == null) {
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throw new Error(Errors.MISSING_ARGUMENTS, "There is a function at the end without any argument specified.");
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}
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}
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}
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return false;
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}
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@Override
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public boolean requiresReversedIteration() {
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return false;
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}
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@Override
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public String getStepName() {
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return "Fix Sums and Subtractions";
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}
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}
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