Package org.antlr.v4.runtime

Examples of org.antlr.v4.runtime.CharStream.LA()

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import static org.junit.Assert.assertEquals;

public class TestUnbufferedCharStream extends BaseTest {
  @Test public void testNoChar() throws Exception {
    CharStream input = createStream("");
    assertEquals(IntStream.EOF, input.LA(1));
    assertEquals(IntStream.EOF, input.LA(2));
  }

  /**
   * The {@link IntStream} interface does not specify the behavior when the
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public class TestUnbufferedCharStream extends BaseTest {
  @Test public void testNoChar() throws Exception {
    CharStream input = createStream("");
    assertEquals(IntStream.EOF, input.LA(1));
    assertEquals(IntStream.EOF, input.LA(2));
  }

  /**
   * The {@link IntStream} interface does not specify the behavior when the
   * EOF symbol is consumed, but {@link UnbufferedCharStream} handles this
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   * particular case by throwing an {@link IllegalStateException}.
   */
  @Test(expected = IllegalStateException.class)
  public void testConsumeEOF() throws Exception {
    CharStream input = createStream("");
    assertEquals(IntStream.EOF, input.LA(1));
    input.consume();
    input.consume();
  }

  @Test(expected = IllegalArgumentException.class)
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  @Test
  public void testLastChar() {
    CharStream input = createStream("abcdef");

    input.consume();
    assertEquals('a', input.LA(-1));

    int m1 = input.mark();
    input.consume();
    input.consume();
    input.consume();
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    int m1 = input.mark();
    input.consume();
    input.consume();
    input.consume();
    assertEquals('d', input.LA(-1));

    input.seek(2);
    assertEquals('b', input.LA(-1));

    input.release(m1);
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    input.consume();
    input.consume();
    assertEquals('d', input.LA(-1));

    input.seek(2);
    assertEquals('b', input.LA(-1));

    input.release(m1);
    input.seek(3);
    assertEquals('c', input.LA(-1));
    // this special case is not required by the IntStream interface, but
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    input.seek(2);
    assertEquals('b', input.LA(-1));

    input.release(m1);
    input.seek(3);
    assertEquals('c', input.LA(-1));
    // this special case is not required by the IntStream interface, but
    // UnbufferedCharStream allows it so we have to make sure the resulting
    // state is consistent
    input.seek(2);
    assertEquals('b', input.LA(-1));
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    assertEquals('c', input.LA(-1));
    // this special case is not required by the IntStream interface, but
    // UnbufferedCharStream allows it so we have to make sure the resulting
    // state is consistent
    input.seek(2);
    assertEquals('b', input.LA(-1));
  }

  @Test public void test1Char() throws Exception {
    TestingUnbufferedCharStream input = createStream("x");
    assertEquals('x', input.LA(1));
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    assertEquals("\uFFFF", input.getBuffer());
  }

    @Test public void test2CharAhead() throws Exception {
       CharStream input = createStream("xy");
       assertEquals('x', input.LA(1));
       assertEquals('y', input.LA(2));
       assertEquals(IntStream.EOF, input.LA(3));
     }

    @Test public void testBufferExpand() throws Exception {
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  }

    @Test public void test2CharAhead() throws Exception {
       CharStream input = createStream("xy");
       assertEquals('x', input.LA(1));
       assertEquals('y', input.LA(2));
       assertEquals(IntStream.EOF, input.LA(3));
     }

    @Test public void testBufferExpand() throws Exception {
    TestingUnbufferedCharStream input = createStream("01234", 2);
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