Examples of org.antlr.misc.IntervalSet

org.antlr.misc.IntervalSet
A set of integers that relies on ranges being common to do "run-length-encoded" like compression (if you view an IntSet like a BitSet with runs of 0s and 1s). Only ranges are recorded so that a few ints up near value 1000 don't cause massive bitsets, just two integer intervals. element values may be negative. Useful for sets of EPSILON and EOF. 0..9 char range is index pair ['\u0030','\u0039']. Multiple ranges are encoded with multiple index pairs. Isolated elements are encoded with an index pair where both intervals are the same. The ranges are ordered and disjoint so that 2..6 appears before 101..103.

        String result = s.subtract(s2).toString();
        assertEquals(result, expecting);
    }


    @Test public void testMembership() throws Exception {
        IntervalSet s = IntervalSet.of(15,15);
        s.add(50,60);
        assertTrue(!s.member(0));
        assertTrue(!s.member(20));
        assertTrue(!s.member(100));
        assertTrue(s.member(15));
        assertTrue(s.member(55));
        assertTrue(s.member(50));
        assertTrue(s.member(60));
    }

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        assertTrue(s.member(60));
    }


    // {2,15,18} & 10..20
    @Test public void testIntersectionWithTwoContainedElements() throws Exception {
        IntervalSet s = IntervalSet.of(10,20);
        IntervalSet s2 = IntervalSet.of(2,2);
        s2.add(15);
        s2.add(18);
        String expecting = "{15, 18}";
        String result = (s.and(s2)).toString();
        assertEquals(result, expecting);
    }

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        String result = (s.and(s2)).toString();
        assertEquals(result, expecting);
    }


    @Test public void testIntersectionWithTwoContainedElementsReversed() throws Exception {
        IntervalSet s = IntervalSet.of(10,20);
        IntervalSet s2 = IntervalSet.of(2,2);
        s2.add(15);
        s2.add(18);
        String expecting = "{15, 18}";
        String result = (s2.and(s)).toString();
        assertEquals(result, expecting);
    }

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        String result = (s2.and(s)).toString();
        assertEquals(result, expecting);
    }


    @Test public void testComplement() throws Exception {
        IntervalSet s = IntervalSet.of(100,100);
        s.add(101,101);
        IntervalSet s2 = IntervalSet.of(100,102);
        String expecting = "102";
        String result = (s.complement(s2)).toString();
        assertEquals(result, expecting);
    }

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        String result = (s.complement(s2)).toString();
        assertEquals(result, expecting);
    }


  @Test public void testComplement2() throws Exception {
    IntervalSet s = IntervalSet.of(100,101);
    IntervalSet s2 = IntervalSet.of(100,102);
    String expecting = "102";
    String result = (s.complement(s2)).toString();
    assertEquals(result, expecting);
  }

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    String result = (s.complement(s2)).toString();
    assertEquals(result, expecting);
  }


  @Test public void testComplement3() throws Exception {
    IntervalSet s = IntervalSet.of(1,96);
    s.add(99,Label.MAX_CHAR_VALUE);
    String expecting = "97..98";
    String result = (s.complement(1,Label.MAX_CHAR_VALUE)).toString();
    assertEquals(result, expecting);
  }

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    assertEquals(result, expecting);
  }


    @Test public void testMergeOfRangesAndSingleValues() throws Exception {
        // {0..41, 42, 43..65534}
        IntervalSet s = IntervalSet.of(0,41);
        s.add(42);
        s.add(43,65534);
        String expecting = "0..65534";
        String result = s.toString();
        assertEquals(result, expecting);
    }

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        String result = s.toString();
        assertEquals(result, expecting);
    }


    @Test public void testMergeOfRangesAndSingleValuesReverse() throws Exception {
        IntervalSet s = IntervalSet.of(43,65534);
        s.add(42);
        s.add(0,41);
        String expecting = "0..65534";
        String result = s.toString();
        assertEquals(result, expecting);
    }

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        assertEquals(result, expecting);
    }


    @Test public void testMergeWhereAdditionMergesTwoExistingIntervals() throws Exception {
        // 42, 10, {0..9, 11..41, 43..65534}
        IntervalSet s = IntervalSet.of(42);
        s.add(10);
        s.add(0,9);
        s.add(43,65534);
        s.add(11,41);
        String expecting = "0..65534";
        String result = s.toString();
        assertEquals(result, expecting);
    }

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   * https://github.com/antlr/antlr4/issues/153
   * <p>
   * Resolution back-ported from V4.</p>
   */
  @Test public void testMergeWhereAdditionMergesThreeExistingIntervals() throws Exception {
    IntervalSet s = new IntervalSet();
    s.add(0);
    s.add(3);
    s.add(5);
    s.add(0, 7);
    String expecting = "0..7";
    String result = s.toString();
    assertEquals(expecting, result);
  }

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