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Handle RootSquare functions with RootPattern

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This commit is contained in:
Riccardo Azzolini 2018-10-16 20:33:01 +02:00
parent 66a04607b3
commit 21d8c37903
2 changed files with 47 additions and 5 deletions
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24
core/src/main/java/it/cavallium/warppi/math/rules/dsl/patterns/RootPattern.java
View File

@ -2,16 +2,21 @@ package it.cavallium.warppi.math.rules.dsl.patterns;
import it.cavallium.warppi.math.Function;
import it.cavallium.warppi.math.MathContext;
import it.cavallium.warppi.math.functions.Number;
import it.cavallium.warppi.math.functions.Root;
import it.cavallium.warppi.math.functions.RootSquare;
import it.cavallium.warppi.math.rules.dsl.Pattern;
import it.cavallium.warppi.math.rules.dsl.PatternUtils;
import it.cavallium.warppi.math.rules.dsl.VisitorPattern;
import java.math.BigDecimal;
import java.util.Map;
import java.util.Optional;
/**
* Matches and generates a root of degree and radicand patterns.
* <p>
* Also matches and generates functions of type <code>RootSquare</code>.
*/
public class RootPattern extends VisitorPattern {
private final Pattern degree;
@ -27,12 +32,21 @@ public class RootPattern extends VisitorPattern {
return PatternUtils.matchFunctionOperatorParameters(root, degree, radicand);
}
@Override
public Optional<Map<String, Function>> visit(RootSquare rootSquare) {
return PatternUtils.matchFunctionOperatorParameters(rootSquare, degree, radicand);
}
@Override
public Function replace(final MathContext mathContext, final Map<String, Function> subFunctions) {
return new Root(
mathContext,
degree.replace(mathContext, subFunctions),
radicand.replace(mathContext, subFunctions)
);
final Function newDegree = degree.replace(mathContext, subFunctions);
final Function newRadicand = radicand.replace(mathContext, subFunctions);
if (newDegree instanceof Number
&& ((Number) newDegree).getTerm().compareTo(new BigDecimal(2)) == 0) {
return new RootSquare(mathContext, newRadicand);
} else {
return new Root(mathContext, newDegree, newRadicand);
}
}
}

28
core/src/test/java/it/cavallium/warppi/math/rules/dsl/PatternTest.java
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@ -160,6 +160,34 @@ public class PatternTest {
assertEquals(shouldMatch, pattern.replace(mathContext, subFunctions.get()));
}
@Test
public void rootPatternForRootSquare() {
final Pattern pattern = new RootPattern(
new SubFunctionPattern("x"),
new SubFunctionPattern("y")
);
final Function root = new Root(
mathContext,
new Number(mathContext, 2),
new Number(mathContext, 1)
);
final Optional<Map<String, Function>> rootSubFunctions = pattern.match(root);
assertTrue(rootSubFunctions.isPresent());
final Function rootSquare = new RootSquare(
mathContext,
new Number(mathContext, 1)
);
final Optional<Map<String, Function>> rootSquareSubFunctions = pattern.match(rootSquare);
assertTrue(rootSquareSubFunctions.isPresent());
assertEquals(rootSubFunctions.get(), rootSquareSubFunctions.get());
final Function replacement = pattern.replace(mathContext, rootSubFunctions.get());
assertTrue(replacement instanceof RootSquare);
assertEquals(rootSquare, replacement);
}
@Test
public void otherBinaryPatterns() {
final Number one = new Number(mathContext, 1);