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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.schema.expressiontransforms;
import com.yahoo.searchlib.rankingexpression.RankingExpression;
import com.yahoo.searchlib.rankingexpression.Reference;
import com.yahoo.searchlib.rankingexpression.evaluation.MapContext;
import com.yahoo.searchlib.rankingexpression.evaluation.MapTypeContext;
import com.yahoo.searchlib.rankingexpression.rule.OperationNode;
import com.yahoo.searchlib.rankingexpression.transform.TransformContext;
import com.yahoo.tensor.TensorType;
import org.junit.jupiter.api.Test;
import java.util.Map;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertTrue;
/**
* @author bratseth
*/
public class BooleanExpressionTransformerTestCase {
@Test
public void booleanTransformation() throws Exception {
assertTransformed("if (a, b, false)", "a && b");
assertTransformed("if (a, true, b)", "a || b");
assertTransformed("if (a, true, b + c)", "a || b + c");
assertTransformed("if (c + a, true, b)", "c + a || b");
assertTransformed("if (c + a, true, b + c)", "c + a || b + c");
assertTransformed("if (a + b, true, if (c - d * e, f, false))", "a + b || c - d * e && f");
assertTransformed("if (a, true, if (b, c, false))", "a || b && c");
assertTransformed("if (a + b, true, if (if (c, d, false), e * f - g, false))", "a + b || c && d && e * f - g");
assertTransformed("if(1 - 1, true, 1 - 1)", "1 - 1 || 1 - 1");
}
@Test
public void noTransformationOnTensorTypes() throws Exception {
var typeContext = new MapTypeContext();
typeContext.setType(Reference.fromIdentifier("tensorA"), TensorType.fromSpec("tensor(x{})"));
typeContext.setType(Reference.fromIdentifier("tensorB"), TensorType.fromSpec("tensor(x{})"));
assertUntransformed("tensorA && tensorB", typeContext);
assertTransformed("a && (tensorA * tensorB)","a && ( tensorA * tensorB)", typeContext);
}
@Test
public void testNotSkewingNonBoolean() throws Exception {
var expr = assertTransformed("a + b + c * d + e + f", "a + b + c * d + e + f");
assertTrue(expr.getRoot() instanceof OperationNode);
OperationNode root = (OperationNode) expr.getRoot();
assertEquals(5, root.operators().size());
assertEquals(6, root.children().size());
}
@Test
public void testTransformPreservesPrecedence() throws Exception {
assertUntransformed("a");
assertUntransformed("a + b");
assertUntransformed("a + b + c");
assertUntransformed("a * b");
assertUntransformed("a + b * c + d");
assertUntransformed("a + b + c * d + e + f");
assertUntransformed("a * b + c + d + e * f");
assertUntransformed("(a * b) + c + d + e * f");
assertUntransformed("(a * b + c) + d + e * f");
assertUntransformed("a * (b + c) + d + e * f");
assertUntransformed("(a * b) + (c + (d + e)) * f");
}
private void assertUntransformed(String input) throws Exception {
assertUntransformed(input, new MapTypeContext());
}
private void assertUntransformed(String input, MapTypeContext typeContext) throws Exception {
assertTransformed(input, input, typeContext);
}
private RankingExpression assertTransformed(String expected, String input) throws Exception {
return assertTransformed(expected, input, new MapTypeContext());
}
private RankingExpression assertTransformed(String expected, String input, MapTypeContext typeContext) throws Exception {
MapContext context = contextWithSingleLetterVariables(typeContext);
var transformedExpression = new BooleanExpressionTransformer()
.transform(new RankingExpression(input),
new TransformContext(Map.of(), typeContext));
assertEquals(new RankingExpression(expected), transformedExpression, "Transformed as expected");
var inputExpression = new RankingExpression(input);
assertEquals(inputExpression.evaluate(context).asBoolean(),
transformedExpression.evaluate(context).asBoolean(),
"Transform and original input are equivalent");
return transformedExpression;
}
private MapContext contextWithSingleLetterVariables(MapTypeContext typeContext) {
var context = new MapContext();
for (int i = 0; i < 26; i++) {
String name = Character.toString(i + 97);
typeContext.setType(Reference.fromIdentifier(name), TensorType.empty);
context.put(name, Math.floorMod(i, 2));
}
return context;
}
}
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