platform/util/testSrc/com/intellij/openapi/util/TextRangeTest.java

/*
 * Copyright 2000-2009 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.intellij.openapi.util;

import com.intellij.util.text.TextRangeUtil;
import junit.framework.TestCase;

import java.util.Arrays;
import java.util.Iterator;
import java.util.List;

/**
 * @author dyoma
 */
public class TextRangeTest extends TestCase {
  public void testSubstring() {
    assertEquals("abc", new TextRange(0, 3).substring("abc"));
    assertEquals("abc", new TextRange(0, 3).substring("abcd"));
    assertEquals("bc", new TextRange(1, 3).substring("abcd"));
    assertEquals("", new TextRange(2, 2).substring("abcd"));
  }

  public void testCutOut() {
    assertEquals(new TextRange(1, 5), new TextRange(1, 5).cutOut(new TextRange(0, 4)));
    assertEquals(new TextRange(2, 5), new TextRange(1, 5).cutOut(new TextRange(1, 4)));
    assertEquals(new TextRange(1, 4), new TextRange(1, 5).cutOut(new TextRange(0, 3)));
    assertEquals(new TextRange(3, 3), new TextRange(1, 5).cutOut(new TextRange(2, 2)));
    try {
      new TextRange(1, 5).cutOut(new TextRange(1, 10));
      fail("AssertionError must be thrown");
    }
    catch (AssertionError e) {

    }
  }

  public void testShiftRight() {
    TextRange range = new TextRange(1, 2);
    assertEquals(new TextRange(2, 3), range.shiftRight(1));
    assertEquals(new TextRange(0, 1), range.shiftRight(-1));
    assertSame(range, range.shiftRight(0));
  }

  public void testReplace() {
    TextRange range = new TextRange(1, 3);
    assertEquals("0a345", range.replace("012345", "a"));
    assertEquals("0345", range.replace("012345", ""));
    assertEquals("0abcdef345", range.replace("012345", "abcdef"));
  }
  
  public void testExcludedRanges() {
    List<TextRange> excludedRanges = 
      Arrays.asList(
        new TextRange(95,110),
        new TextRange(15,40),
        new TextRange(5,20),
        new TextRange(105,120),
        new TextRange(70,90),
        new TextRange(50,57),
        new TextRange(56,65),
        new TextRange(50,60)
      );
    List<TextRange> expectedRanges = 
      Arrays.asList(
        new TextRange(40,50),
        new TextRange(65,70),
        new TextRange(90,95)
      );
    Iterable<TextRange> result = TextRangeUtil.excludeRanges(new TextRange(30,100), excludedRanges);
    Iterator<TextRange> resultIterator = result.iterator();
    for (TextRange expectedRange : expectedRanges) {
      assertTrue("Less elements than expected", resultIterator.hasNext());
      TextRange actualRange = resultIterator.next();
      assertEquals("Ranges do not match", expectedRange, actualRange);
    }
    assertTrue("More elements than expected", !resultIterator.hasNext());
  }
}