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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.vespa.indexinglanguage.expressions;
import com.yahoo.document.datatypes.FieldValue;
import com.yahoo.document.datatypes.IntegerFieldValue;
import com.yahoo.vespa.indexinglanguage.SimpleTestAdapter;
import org.junit.Test;
import static org.junit.Assert.*;
/**
* @author Simon Thoresen Hult
*/
public class MathResolverTestCase {
// --------------------------------------------------------------------------------
//
// Tests
//
// --------------------------------------------------------------------------------
@Test
public void requireThatOperatorsWork() {
assertEquals(3, evaluate(1, ArithmeticExpression.Operator.ADD, 2));
assertEquals(1, evaluate(3, ArithmeticExpression.Operator.SUB, 2));
assertEquals(2, evaluate(4, ArithmeticExpression.Operator.DIV, 2));
assertEquals(1, evaluate(3, ArithmeticExpression.Operator.MOD, 2));
assertEquals(4, evaluate(2, ArithmeticExpression.Operator.MUL, 2));
}
@Test
public void requireThatOperatorPrecedenceIsCorrect() {
assertEquals(3, evaluate(1, ArithmeticExpression.Operator.ADD, 1, ArithmeticExpression.Operator.ADD, 1));
assertEquals(1, evaluate(1, ArithmeticExpression.Operator.ADD, 1, ArithmeticExpression.Operator.SUB, 1));
assertEquals(4, evaluate(2, ArithmeticExpression.Operator.ADD, 4, ArithmeticExpression.Operator.DIV, 2));
assertEquals(2, evaluate(1, ArithmeticExpression.Operator.ADD, 3, ArithmeticExpression.Operator.MOD, 2));
assertEquals(3, evaluate(1, ArithmeticExpression.Operator.ADD, 1, ArithmeticExpression.Operator.MUL, 2));
assertEquals(1, evaluate(1, ArithmeticExpression.Operator.SUB, 1, ArithmeticExpression.Operator.ADD, 1));
assertEquals(-1, evaluate(1, ArithmeticExpression.Operator.SUB, 1, ArithmeticExpression.Operator.SUB, 1));
assertEquals(-1, evaluate(1, ArithmeticExpression.Operator.SUB, 4, ArithmeticExpression.Operator.DIV, 2));
assertEquals(1, evaluate(2, ArithmeticExpression.Operator.SUB, 3, ArithmeticExpression.Operator.MOD, 2));
assertEquals(-1, evaluate(1, ArithmeticExpression.Operator.SUB, 1, ArithmeticExpression.Operator.MUL, 2));
assertEquals(3, evaluate(4, ArithmeticExpression.Operator.DIV, 2, ArithmeticExpression.Operator.ADD, 1));
assertEquals(1, evaluate(4, ArithmeticExpression.Operator.DIV, 2, ArithmeticExpression.Operator.SUB, 1));
assertEquals(2, evaluate(4, ArithmeticExpression.Operator.DIV, 2, ArithmeticExpression.Operator.DIV, 1));
assertEquals(2, evaluate(4, ArithmeticExpression.Operator.DIV, 2, ArithmeticExpression.Operator.MOD, 3));
assertEquals(2, evaluate(4, ArithmeticExpression.Operator.DIV, 2, ArithmeticExpression.Operator.MUL, 1));
assertEquals(2, evaluate(3, ArithmeticExpression.Operator.MOD, 2, ArithmeticExpression.Operator.ADD, 1));
assertEquals(0, evaluate(3, ArithmeticExpression.Operator.MOD, 2, ArithmeticExpression.Operator.SUB, 1));
assertEquals(1, evaluate(3, ArithmeticExpression.Operator.MOD, 2, ArithmeticExpression.Operator.DIV, 1));
assertEquals(1, evaluate(3, ArithmeticExpression.Operator.MOD, 2, ArithmeticExpression.Operator.MOD, 2));
assertEquals(1, evaluate(3, ArithmeticExpression.Operator.MOD, 2, ArithmeticExpression.Operator.MUL, 1));
assertEquals(3, evaluate(1, ArithmeticExpression.Operator.MUL, 2, ArithmeticExpression.Operator.ADD, 1));
assertEquals(1, evaluate(1, ArithmeticExpression.Operator.MUL, 2, ArithmeticExpression.Operator.SUB, 1));
assertEquals(2, evaluate(2, ArithmeticExpression.Operator.MUL, 2, ArithmeticExpression.Operator.DIV, 2));
assertEquals(0, evaluate(1, ArithmeticExpression.Operator.MUL, 2, ArithmeticExpression.Operator.MOD, 2));
assertEquals(4, evaluate(1, ArithmeticExpression.Operator.MUL, 2, ArithmeticExpression.Operator.MUL, 2));
}
@Test
public void requireThatFirstOperatorIsAdd() {
MathResolver resolver = new MathResolver();
for (ArithmeticExpression.Operator type : ArithmeticExpression.Operator.values()) {
if (type == ArithmeticExpression.Operator.ADD) {
continue;
}
try {
resolver.push(type, newInteger(69));
} catch (IllegalArgumentException e) {
assertEquals("First item in an arithmetic operation must be an addition, not " + type, e.getMessage());
}
}
}
@Test
public void requireThatNullOperatorThrowsException() {
try {
new MathResolver().push(null, newInteger(69));
fail();
} catch (IllegalArgumentException e) {
}
}
// --------------------------------------------------------------------------------
//
// Utilities
//
// --------------------------------------------------------------------------------
private static Expression newInteger(int val) {
return new ConstantExpression(new IntegerFieldValue(val));
}
private static int evaluate(Expression exp) {
FieldValue val = new ExecutionContext(new SimpleTestAdapter()).execute(exp).getValue();
assertTrue(val instanceof IntegerFieldValue);
return ((IntegerFieldValue)val).getInteger();
}
private static int evaluate(int lhs, ArithmeticExpression.Operator op, int rhs) {
MathResolver resolver = new MathResolver();
resolver.push(ArithmeticExpression.Operator.ADD, newInteger(lhs));
resolver.push(op, newInteger(rhs));
return evaluate(resolver.resolve());
}
private static int evaluate(int valA,
ArithmeticExpression.Operator opB, int valC,
ArithmeticExpression.Operator opD, int valE)
{
MathResolver resolver = new MathResolver();
resolver.push(ArithmeticExpression.Operator.ADD, newInteger(valA));
resolver.push(opB, newInteger(valC));
resolver.push(opD, newInteger(valE));
return evaluate(resolver.resolve());
}
}
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