1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
// 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.evaluation.MapContext;
import com.yahoo.searchlib.rankingexpression.evaluation.MapTypeContext;
import com.yahoo.searchlib.rankingexpression.rule.OperationNode;
import com.yahoo.searchlib.rankingexpression.transform.TransformContext;
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 testTransformer() 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 testIt() throws Exception {
assertTransformed("if(1 - 1, true, 1 - 1)", "1 - 1 || 1 - 1");
}
@Test
public void testNotSkewingNonBoolean() throws Exception {
assertTransformed("a + b + c * d + e + f", "a + b + c * d + e + f");
var expr = new BooleanExpressionTransformer()
.transform(new RankingExpression("a + b + c * d + e + f"),
new TransformContext(Map.of(), new MapTypeContext()));
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 {
assertTransformed(input, input);
}
private void assertTransformed(String expected, String input) throws Exception {
var transformedExpression = new BooleanExpressionTransformer()
.transform(new RankingExpression(input),
new TransformContext(Map.of(), new MapTypeContext()));
assertEquals(new RankingExpression(expected), transformedExpression, "Transformed as expected");
MapContext context = contextWithSingleLetterVariables();
var inputExpression = new RankingExpression(input);
assertEquals(inputExpression.evaluate(context).asBoolean(),
transformedExpression.evaluate(context).asBoolean(),
"Transform and original input are equivalent");
}
private MapContext contextWithSingleLetterVariables() {
var context = new MapContext();
for (int i = 0; i < 26; i++)
context.put(Character.toString(i + 97), Math.floorMod(i, 2));
return context;
}
}
|
