Package org.antlr.v4.runtime

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

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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);
       assertEquals('0', input.LA(1));
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       assertEquals(IntStream.EOF, input.LA(6));
     }

    @Test public void testBufferWrapSize1() throws Exception {
       CharStream input = createStream("01234", 1);
        assertEquals('0', input.LA(1));
        input.consume();
        assertEquals('1', input.LA(1));
        input.consume();
        assertEquals('2', input.LA(1));
        input.consume();
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    @Test public void testBufferWrapSize1() throws Exception {
       CharStream input = createStream("01234", 1);
        assertEquals('0', input.LA(1));
        input.consume();
        assertEquals('1', input.LA(1));
        input.consume();
        assertEquals('2', input.LA(1));
        input.consume();
        assertEquals('3', input.LA(1));
        input.consume();
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       CharStream input = createStream("01234", 1);
        assertEquals('0', input.LA(1));
        input.consume();
        assertEquals('1', input.LA(1));
        input.consume();
        assertEquals('2', input.LA(1));
        input.consume();
        assertEquals('3', input.LA(1));
        input.consume();
        assertEquals('4', input.LA(1));
        input.consume();
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        input.consume();
        assertEquals('1', input.LA(1));
        input.consume();
        assertEquals('2', input.LA(1));
        input.consume();
        assertEquals('3', input.LA(1));
        input.consume();
        assertEquals('4', input.LA(1));
        input.consume();
       assertEquals(IntStream.EOF, input.LA(1));
     }
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        input.consume();
        assertEquals('2', input.LA(1));
        input.consume();
        assertEquals('3', input.LA(1));
        input.consume();
        assertEquals('4', input.LA(1));
        input.consume();
       assertEquals(IntStream.EOF, input.LA(1));
     }

    @Test public void testBufferWrapSize2() throws Exception {
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        input.consume();
        assertEquals('3', input.LA(1));
        input.consume();
        assertEquals('4', input.LA(1));
        input.consume();
       assertEquals(IntStream.EOF, input.LA(1));
     }

    @Test public void testBufferWrapSize2() throws Exception {
       CharStream input = createStream("01234", 2);
        assertEquals('0', input.LA(1));
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       assertEquals(IntStream.EOF, input.LA(1));
     }

    @Test public void testBufferWrapSize2() throws Exception {
       CharStream input = createStream("01234", 2);
        assertEquals('0', input.LA(1));
        input.consume();
        assertEquals('1', input.LA(1));
        input.consume();
        assertEquals('2', input.LA(1));
        input.consume();
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    @Test public void testBufferWrapSize2() throws Exception {
       CharStream input = createStream("01234", 2);
        assertEquals('0', input.LA(1));
        input.consume();
        assertEquals('1', input.LA(1));
        input.consume();
        assertEquals('2', input.LA(1));
        input.consume();
        assertEquals('3', input.LA(1));
        input.consume();
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       CharStream input = createStream("01234", 2);
        assertEquals('0', input.LA(1));
        input.consume();
        assertEquals('1', input.LA(1));
        input.consume();
        assertEquals('2', input.LA(1));
        input.consume();
        assertEquals('3', input.LA(1));
        input.consume();
        assertEquals('4', input.LA(1));
        input.consume();
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