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.toString();
        assertEquals(result, expecting);
    }


  @Test public void testMergeWithDoubleOverlap() throws Exception {
    IntervalSet s = IntervalSet.of(1,10);
    s.add(20,30);
    s.add(5,25); // overlaps two!
    String expecting = "1..30";
    String result = s.toString();
    assertEquals(result, expecting);
  }

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


  @Test public void testSize() throws Exception {
    IntervalSet s = IntervalSet.of(20,30);
    s.add(50,55);
    s.add(5,19);
    String expecting = "32";
    String result = String.valueOf(s.size());
    assertEquals(result, expecting);
  }

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


  @Test public void testToList() throws Exception {
    IntervalSet s = IntervalSet.of(20,25);
    s.add(50,55);
    s.add(5,5);
    String expecting = "[5, 20, 21, 22, 23, 24, 25, 50, 51, 52, 53, 54, 55]";
    List foo = new ArrayList();
    String result = String.valueOf(s.toList());
    assertEquals(result, expecting);
  }

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      {'\u0000'..'q', 's'}!!!! broken...
     'q' is 113 ascii
     'u' is 117
  */
  @Test public void testNotRIntersectionNotT() throws Exception {
    IntervalSet s = IntervalSet.of(0,'s');
    s.add('u',200);
    IntervalSet s2 = IntervalSet.of(0,'q');
    s2.add('s',200);
    String expecting = "{0..113, 115, 117..200}";
    String result = (s.and(s2)).toString();
    assertEquals(result, expecting);
  }

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    /** Public default constructor used by TestRig */
    public TestIntervalSet() {
    }


    @Test public void testSingleElement() throws Exception {
        IntervalSet s = IntervalSet.of(99);
        String expecting = "99";
        assertEquals(s.toString(), expecting);
    }

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        String expecting = "99";
        assertEquals(s.toString(), expecting);
    }


    @Test public void testIsolatedElements() throws Exception {
        IntervalSet s = new IntervalSet();
        s.add(1);
        s.add('z');
        s.add('\uFFF0');
        String expecting = "{1, 122, 65520}";
        assertEquals(s.toString(), expecting);
    }

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        String expecting = "{1, 122, 65520}";
        assertEquals(s.toString(), expecting);
    }


    @Test public void testMixedRangesAndElements() throws Exception {
        IntervalSet s = new IntervalSet();
        s.add(1);
        s.add('a','z');
        s.add('0','9');
        String expecting = "{1, 48..57, 97..122}";
        assertEquals(s.toString(), expecting);
    }

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        String expecting = "{1, 48..57, 97..122}";
        assertEquals(s.toString(), expecting);
    }


    @Test public void testSimpleAnd() throws Exception {
        IntervalSet s = IntervalSet.of(10,20);
        IntervalSet s2 = IntervalSet.of(13,15);
        String expecting = "13..15";
        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 testRangeAndIsolatedElement() throws Exception {
        IntervalSet s = IntervalSet.of('a','z');
        IntervalSet s2 = IntervalSet.of('d');
        String expecting = "100";
        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 testEmptyIntersection() throws Exception {
    IntervalSet s = IntervalSet.of('a','z');
    IntervalSet s2 = IntervalSet.of('0','9');
    String expecting = "{}";
    String result = (s.and(s2)).toString();
    assertEquals(result, expecting);
  }

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