Examples of java.text.Bidi

java.text.Bidi
This class implements the Unicode Bidirectional Algorithm.
A Bidi object provides information on the bidirectional reordering of the text used to create it. This is required, for example, to properly display Arabic or Hebrew text. These languages are inherently mixed directional, as they order numbers from left-to-right while ordering most other text from right-to-left.
Once created, a Bidi object can be queried to see if the text it represents is all left-to-right or all right-to-left. Such objects are very lightweight and this text is relatively easy to process.
If there are multiple runs of text, information about the runs can be accessed by indexing to get the start, limit, and level of a run. The level represents both the direction and the 'nesting level' of a directional run. Odd levels are right-to-left, while even levels are left-to-right. So for example level 0 represents left-to-right text, while level 1 represents right-to-left text, and level 2 represents left-to-right text embedded in a right-to-left run. @since 1.4

    assertTrue(bd.isMixed());
    assertFalse(bd.isRightToLeft());
  }


  public void testComplicatedBidi() {
    bd = new Bidi("a\u05D0a\"a\u05D0\"\u05D0a",
        Bidi.DIRECTION_RIGHT_TO_LEFT);
    assertFalse(bd.baseIsLeftToRight());
    assertEquals(1, bd.getBaseLevel());
    assertEquals(9, bd.getLength());
    assertEquals(2, bd.getLevelAt(0));

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    assertTrue(bd.isMixed());
    assertFalse(bd.isRightToLeft());
  }


  public void testComplicatedOverrideBidi() {
    bd = new Bidi("a\u05D0a\"a\u05D0\"\u05D0a".toCharArray(), 0,
        new byte[] { 0, 0, 0, -3, -3, 2, 2, 0, 3 }, 0, 9,
        Bidi.DIRECTION_RIGHT_TO_LEFT);
    assertFalse(bd.baseIsLeftToRight());
    assertEquals(1, bd.getBaseLevel());
    assertEquals(9, bd.getLength());

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    assertFalse(Bidi.requiresBidi("aa\u05D0a".toCharArray(), 0, 2));
    assertTrue(Bidi.requiresBidi("aa\u05D0a".toCharArray(), 1, 3));
  }


  public void testHebrewOverrideEmbeddings() {
    bd = new Bidi(new char[] { '\u05D0', '\u05D0', '\u05D0' }, 0,
        new byte[] { (byte) -1, (byte) -2, (byte) -3 }, 0, 3,
        Bidi.DIRECTION_DEFAULT_LEFT_TO_RIGHT);
    assertFalse(bd.baseIsLeftToRight());
    assertEquals(1, bd.getBaseLevel());
    assertEquals(3, bd.getLength());
    assertEquals(1, bd.getLevelAt(0));
    assertEquals(2, bd.getLevelAt(1));
    assertEquals(3, bd.getLevelAt(2));
    assertEquals(1, bd.getLevelAt(1000));
    assertEquals(3, bd.getRunCount());
    assertRunArrayEquals(new int[][] { { 0, 1, 1 }, { 1, 2, 2 },
        { 2, 3, 3 }, }, bd);
    assertFalse(bd.isLeftToRight());
    assertTrue(bd.isMixed());
    assertFalse(bd.isRightToLeft());


    bd = new Bidi(new char[] { '\u05D0', '\u05D0', '\u05D0' }, 0,
        new byte[] { (byte) -1, (byte) -2, (byte) -3 }, 0, 3,
        Bidi.DIRECTION_DEFAULT_RIGHT_TO_LEFT);
    assertFalse(bd.baseIsLeftToRight());
    assertEquals(1, bd.getBaseLevel());
    assertEquals(3, bd.getLength());
    assertEquals(1, bd.getLevelAt(0));
    assertEquals(2, bd.getLevelAt(1));
    assertEquals(3, bd.getLevelAt(2));
    assertEquals(1, bd.getLevelAt(1000));
    assertEquals(3, bd.getRunCount());
    assertRunArrayEquals(new int[][] { { 0, 1, 1 }, { 1, 2, 2 },
        { 2, 3, 3 }, }, bd);
    assertFalse(bd.isLeftToRight());
    assertTrue(bd.isMixed());
    assertFalse(bd.isRightToLeft());


    bd = new Bidi(new char[] { '\u05D0', '\u05D0', '\u05D0' }, 0,
        new byte[] { (byte) -1, (byte) -2, (byte) -3 }, 0, 3,
        Bidi.DIRECTION_LEFT_TO_RIGHT);
    assertTrue(bd.baseIsLeftToRight());
    assertEquals(0, bd.getBaseLevel());
    assertEquals(3, bd.getLength());
    assertEquals(1, bd.getLevelAt(0));
    assertEquals(2, bd.getLevelAt(1));
    assertEquals(3, bd.getLevelAt(2));
    assertEquals(0, bd.getLevelAt(1000));
    assertEquals(3, bd.getRunCount());
    assertRunArrayEquals(new int[][] { { 0, 1, 1 }, { 1, 2, 2 },
        { 2, 3, 3 }, }, bd);
    assertFalse(bd.isLeftToRight());
    assertTrue(bd.isMixed());
    assertFalse(bd.isRightToLeft());


    bd = new Bidi(new char[] { '\u05D0', '\u05D0', '\u05D0' }, 0,
        new byte[] { (byte) -1, (byte) -2, (byte) -3 }, 0, 3,
        Bidi.DIRECTION_RIGHT_TO_LEFT);
    assertFalse(bd.baseIsLeftToRight());
    assertEquals(1, bd.getBaseLevel());
    assertEquals(3, bd.getLength());

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    assertTrue(bd.isMixed());
    assertFalse(bd.isRightToLeft());
  }


  public void testCreateLineBidi() {
    bd = new Bidi("a\u05D0a\u05D0a\u05D0\"\u05D0a".toCharArray(), 0,
        new byte[] { 0, 0, 0, -3, -3, 2, 2, 0, 3 }, 0, 9,
        Bidi.DIRECTION_RIGHT_TO_LEFT);
    Bidi line = bd.createLineBidi(2, 7);
    assertFalse(line.baseIsLeftToRight());
    assertEquals(1, line.getBaseLevel());
    assertEquals(5, line.getLength());
    assertEquals(2, line.getLevelAt(0));
    assertEquals(3, line.getLevelAt(1));
    assertEquals(3, line.getLevelAt(2));
    assertEquals(3, line.getLevelAt(3));
    assertEquals(2, line.getLevelAt(4));
    assertEquals(1, line.getLevelAt(1000));
    assertEquals(3, line.getRunCount());
    assertRunArrayEquals(new int[][] { { 0, 1, 2 }, { 1, 4, 3 },
        { 4, 5, 2 }, }, line);
    assertFalse(line.isLeftToRight());
    assertTrue(line.isMixed());
    assertFalse(line.isRightToLeft());
  }

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    assertFalse(line.isRightToLeft());
  }


    public void testCreateLineBidiInvalid() {
        //regression for HARMONY-1050
        Bidi bidi = new Bidi("str", 1);
        try {
            bidi.createLineBidi(-1, 1);
            fail("Expected IAE");           
        } catch (IllegalArgumentException e) {
            // Expected
        }
        
        try {
            bidi.createLineBidi(1, -1);
            fail("Expected IAE");           
        } catch (IllegalArgumentException e) {
            // Expected
        }
        
        try {
            bidi.createLineBidi(-1, -1);
            fail("Expected IAE");           
        } catch (IllegalArgumentException e) {
            // Expected
        }


        try {
            bidi.createLineBidi(2, 1);
            fail("Expected IAE");           
        } catch (IllegalArgumentException e) {
            // Expected
        }


        try {
            bidi.createLineBidi(2, 2);
        }catch (IllegalArgumentException e){
            // Expected
        }


        try {
            bidi.createLineBidi(2, 4);
            fail("Expected IAE");           
        } catch (IllegalArgumentException e) {
            // Expected
        }
    }

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        }
    }
    
  public void testIncompatibleLineAlgorithm() {
    // ICU treat a new line as in the same run, however RI does not
    bd = new Bidi("aaaaa".toCharArray(), 0,
        new byte[] { -2, -1, -3, -3, -2 }, 0, 5,
        Bidi.DIRECTION_RIGHT_TO_LEFT);
    Bidi line = bd.createLineBidi(1, 4);
    assertFalse(line.baseIsLeftToRight());
    assertEquals(1, line.getBaseLevel());
    assertEquals(3, line.getLength());
    assertEquals(1, line.getLevelAt(0));
    assertEquals(1, line.getLevelAt(1));
    assertEquals(1, line.getLevelAt(2));
    assertEquals(1, line.getLevelAt(1000));
    assertEquals(1, line.getRunCount());
    assertRunArrayEquals(new int[][] { { 0, 3, 1 }, }, line);
    assertFalse(line.isLeftToRight());
    assertFalse(line.isMixed());
    assertTrue(line.isRightToLeft());
  }

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                {3, 5},
                {5, 7},
                {7, 9},
        };
        
        Bidi bi = new Bidi(defText, 0);
        final int count = bi.getRunCount();
        for (int i = 0; i < count; i++) {
            assertEquals(expectedRuns[i][0], bi.getRunStart(i));
            assertEquals(expectedRuns[i][1], bi.getRunLimit(i));
        }
    }

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            assertEquals(expectedRuns[i][0], bi.getRunStart(i));
            assertEquals(expectedRuns[i][1], bi.getRunLimit(i));
        }
    }
       public void testGetRunLimit() {
         bd = new Bidi("text", Bidi.DIRECTION_LEFT_TO_RIGHT);
         try {
             assertTrue(4 == bd.getRunLimit(-1));
         } catch (IllegalArgumentException e) {
             // Expected for illegal run limit
             return;

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         fail("Expected IllegalArgumentException to be thrown for invalid run limit");
       }


       public void testBidiConstructor_Iterator() {
               AttributedString paragraph = new AttributedString("text");
         bd = new Bidi(paragraph.getIterator());
         try {
             assertTrue(4 == bd.getRunLimit(1));
         } catch (IllegalArgumentException e) {
             // Expected for illegal run limit
             return;

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        try {
            content.getChars(parStart, parLen, text);
        } catch (final BadLocationException e) { }


        Bidi bidi = new Bidi(text.array, text.offset, null, 0, text.count,
                             getDefaultDirection(par));


        final int runCount = bidi.getRunCount();
        for (int i = 0; i < runCount; i++) {
            int level = bidi.getRunLevel(i);


            if (i == 0 && added.size() > 0) {
                Element prevBidi = added.get(added.size() - 1);
                if (getBidiLevel(prevBidi) == level) {
                    added.remove(added.size() - 1);
                    added.add(new BidiElement(prevBidi.getAttributes(),
                                              prevBidi.getStartOffset(),
                                              parStart + bidi.getRunLimit(i)));
                    continue;
                }
            }


            added.add(
                new BidiElement(context.addAttribute(context.getEmptySet(),
                                                     StyleConstants.BidiLevel,
                                                     new Integer(level)),
                                parStart + bidi.getRunStart(i),
                                parStart + bidi.getRunLimit(i)));
        }


    }

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