/*
* $Id$
*
* Copyright (C) 2003-2015 JNode.org
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; If not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package org.jnode.test.shell.bjorne;
import org.jnode.shell.ShellException;
import org.jnode.shell.ShellSyntaxException;
import org.jnode.shell.bjorne.BjorneArithmeticEvaluator;
import org.jnode.shell.bjorne.BjorneContext;
import org.jnode.shell.io.CommandIOHolder;
import org.junit.Assert;
import org.junit.Test;
/**
* Some unit tests for the BjorneArithmeticEvaluator class.
*
* @author crawley@jnode.org
*/
public class BjorneArithmeticEvaluatorTest {
// This class simply allows us to call the setVariable method directly
private static class TestBjorneContext extends BjorneContext {
TestBjorneContext(CommandIOHolder[] holders) {
super(null, holders);
}
TestBjorneContext() {
super(null, null);
}
@Override
protected void setVariable(String name, String value) {
super.setVariable(name, value);
}
@Override
protected String variable(String name) throws ShellSyntaxException {
return super.variable(name);
}
}
private static class TestBjorneArithmeticEvaluator extends BjorneArithmeticEvaluator {
public TestBjorneArithmeticEvaluator(BjorneContext context) {
super(context);
}
@Override
public synchronized String evaluateExpression(CharSequence source) throws ShellException {
return super.evaluateExpression(source);
}
}
@Test
public void testConstructor() {
new BjorneArithmeticEvaluator(new TestBjorneContext());
}
@Test
public void testLiterals() throws ShellException {
TestBjorneArithmeticEvaluator ev =
new TestBjorneArithmeticEvaluator(new TestBjorneContext());
Assert.assertEquals("1", ev.evaluateExpression("1"));
Assert.assertEquals("1", ev.evaluateExpression(" 1 "));
Assert.assertEquals("42", ev.evaluateExpression("42"));
}
@Test
public void testVariable() throws ShellException {
TestBjorneContext context = new TestBjorneContext();
context.setVariable("A", "1");
TestBjorneArithmeticEvaluator ev = new TestBjorneArithmeticEvaluator(context);
Assert.assertEquals("1", ev.evaluateExpression("A"));
Assert.assertEquals("1", ev.evaluateExpression(" A "));
Assert.assertEquals("0", ev.evaluateExpression(" B"));
}
@Test
public void testUnaryPlusMinus() throws ShellException {
TestBjorneContext context = new TestBjorneContext();
context.setVariable("A", "1");
TestBjorneArithmeticEvaluator ev = new TestBjorneArithmeticEvaluator(context);
Assert.assertEquals("1", ev.evaluateExpression("+A"));
Assert.assertEquals("1", ev.evaluateExpression(" + A "));
Assert.assertEquals("0", ev.evaluateExpression(" + B"));
Assert.assertEquals("-1", ev.evaluateExpression("-A"));
Assert.assertEquals("-1", ev.evaluateExpression(" - A "));
Assert.assertEquals("0", ev.evaluateExpression(" - B"));
}
@Test
public void testInfixOperators() throws ShellException {
TestBjorneContext context = new TestBjorneContext();
context.setVariable("A", "1");
TestBjorneArithmeticEvaluator ev = new TestBjorneArithmeticEvaluator(context);
Assert.assertEquals("2", ev.evaluateExpression("1 + 1"));
Assert.assertEquals("2", ev.evaluateExpression("A + 1"));
Assert.assertEquals("0", ev.evaluateExpression("1 - 1"));
Assert.assertEquals("0", ev.evaluateExpression("1 - A"));
Assert.assertEquals("4", ev.evaluateExpression("2 * 2"));
Assert.assertEquals("2", ev.evaluateExpression("4 / 2"));
Assert.assertEquals("1", ev.evaluateExpression("4 % 3"));
Assert.assertEquals("27", ev.evaluateExpression("3 ** 3"));
try {
ev.evaluateExpression("4 / 0");
Assert.fail("no exception for '4 / 0'");
} catch (ShellException ex) {
// expected
}
try {
ev.evaluateExpression("4 % 0");
Assert.fail("no exception for '4 % 0'");
} catch (ShellException ex) {
// expected
}
}
@Test
public void testInfixPrecedence() throws ShellException {
TestBjorneContext context = new TestBjorneContext();
context.setVariable("A", "1");
TestBjorneArithmeticEvaluator ev = new TestBjorneArithmeticEvaluator(context);
Assert.assertEquals("0", ev.evaluateExpression("-1 * 2 + 2"));
Assert.assertEquals("4", ev.evaluateExpression("1 * 2 + 2"));
Assert.assertEquals("5", ev.evaluateExpression("1 + 2 * 2"));
Assert.assertEquals("9", ev.evaluateExpression("1 + 2 * 2 ** 2"));
Assert.assertEquals("8", ev.evaluateExpression("1 + 2 * 2 ** 2 + -A"));
}
@Test
public void testParentheses() throws ShellException {
TestBjorneContext context = new TestBjorneContext();
context.setVariable("A", "1");
TestBjorneArithmeticEvaluator ev = new TestBjorneArithmeticEvaluator(context);
Assert.assertEquals("-4", ev.evaluateExpression("-1 * (2 + 2)"));
Assert.assertEquals("4", ev.evaluateExpression("(1 * 2 + 2)"));
Assert.assertEquals("6", ev.evaluateExpression("((1) + 2) * 2"));
Assert.assertEquals("17", ev.evaluateExpression("1 + (2 * 2) ** 2"));
Assert.assertEquals("10", ev.evaluateExpression("1 + 2 * 2 ** 2 + -(-1)"));
}
@Test
public void testIncDec() throws ShellException {
TestBjorneContext context = new TestBjorneContext();
context.setVariable("A", "1");
TestBjorneArithmeticEvaluator ev = new TestBjorneArithmeticEvaluator(context);
Assert.assertEquals("1", ev.evaluateExpression("A++"));
Assert.assertEquals("2", context.variable("A"));
Assert.assertEquals("3", ev.evaluateExpression("++A"));
Assert.assertEquals("3", context.variable("A"));
Assert.assertEquals("3", ev.evaluateExpression("A--"));
Assert.assertEquals("2", context.variable("A"));
Assert.assertEquals("1", ev.evaluateExpression("--A"));
Assert.assertEquals("1", context.variable("A"));
}
}