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MathParserTest.java
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/
MathParserTest.java
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package org.isk.jvmhardcore.mathparser;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.util.LinkedList;
import org.isk.jvmhardcore.mathparser.core.Tokenizer.ParserException;
import org.junit.Assert;
import org.junit.Test;
public class MathParserTest {
private LinkedList<String> expected(final String ... strings) {
final LinkedList<String> list = new LinkedList<>();
for (String s : strings) {
list.add(s);
}
return list;
}
private void test(final String expression, final LinkedList<String> expected) {
final InputStream inputStream = new ByteArrayInputStream(expression.getBytes());
final MathParser parser = new MathParser(inputStream);
final LinkedList<String> tokens = parser.parse();
Assert.assertEquals(expected, tokens);
}
@Test
public void addition() {
this.test("2+5", this.expected("2", "+", "5"));
}
@Test
public void subtraction() {
this.test("2-5", this.expected("2", "-", "5"));
}
@Test
public void multiplication() {
this.test("2*5", this.expected("2", "*", "5"));
}
@Test
public void division() {
this.test("2/5", this.expected("2", "/", "5"));
}
@Test
public void operatorExpected() {
final String string = "3a+5";
final InputStream inputStream = new ByteArrayInputStream(string.getBytes());
final MathParser parser = new MathParser(inputStream);
try {
parser.parse();
Assert.fail();
} catch (ParserException e) {
Assert.assertEquals("Line 1, column 2 - Expected: End of file. Got: a", e.getMessage());
}
}
@Test
public void digitExpected() {
final String string = "2+,5";
final InputStream inputStream = new ByteArrayInputStream(string.getBytes());
final MathParser parser = new MathParser(inputStream);
try {
parser.parse();
Assert.fail();
} catch (ParserException e) {
Assert.assertEquals("Line 1, column 3 - Expected: At least one Digit [0-9]. Got: ,", e.getMessage());
}
}
@Test
public void getNumber0() {
this.test("23+5", this.expected("23", "+", "5"));
}
@Test
public void getNumber1() {
this.test("2+54", this.expected("2", "+", "54"));
}
@Test
public void getNumber2() {
this.test("23+54", this.expected("23", "+", "54"));
}
@Test
public void getFloat0() {
this.test("1.2+5", this.expected("1.2", "+", "5"));
}
@Test
public void getFloat1() {
this.test("1+56.32", this.expected("1", "+", "56.32"));
}
@Test
public void getFloat2() {
this.test("1.2+56.32", this.expected("1.2", "+", "56.32"));
}
@Test
public void getNegativeInteger() {
this.test("-23+-54", this.expected("-23", "+", "-54"));
}
@Test
public void getNegativeFloat() {
this.test("-1.2+-56.32", this.expected("-1.2", "+", "-56.32"));
}
@Test
public void expressionWithUnprintables() {
this.test(" \t1.2\u0003 \u0020+\n5 ", this.expected("1.2", "+", "5"));
}
@Test
public void variableNumberOfOperands() {
this.test("2 + 3 - 4 * 5 / -17", this.expected("2", "+", "3", "-", "4", "*", "5", "/", "-17"));
}
@Test
public void expressionWithParenthesis0() {
this.test("(2 + 5) - 2", this.expected("(", "2", "+", "5", ")", "-", "2"));
}
@Test
public void expressionWithParenthesis1() {
this.test("((2 + 5) * 2) - 2", this.expected("(", "(", "2", "+", "5", ")", "*", "2", ")", "-", "2"));
}
@Test
public void expressionWithParenthesis2() {
this.test("((2 + 5) * (10 - 8)) - 2", this.expected("(", "(", "2", "+", "5", ")", "*", "(", "10", "-", "8", ")", ")", "-", "2"));
}
@Test
public void expressionWithParenthesis3() {
this.test("((2 + 5) * (10 - 8) - 2) + 3", this.expected("(", "(", "2", "+", "5", ")", "*", "(", "10", "-", "8", ")", "-", "2", ")", "+", "3"));
}
@Test
public void expressionWithParenthesis4() {
this.test("((2 + 5) - 2 * (10 - 8)) + 3", this.expected("(", "(", "2", "+", "5", ")", "-", "2", "*", "(", "10", "-", "8", ")", ")", "+", "3"));
}
@Test
public void expressionWithParenthesis5() {
this.test("(2 * (2 + 5) - (10 - 8)) + 3", this.expected("(", "2", "*", "(", "2", "+", "5", ")", "-", "(", "10", "-", "8", ")", ")", "+", "3"));
}
@Test
public void expressionWithParenthesis6() {
this.test("4 - (2 + 5) - 2", this.expected("4", "-", "(", "2", "+", "5", ")", "-", "2"));
}
}