Package org.antlr.v4.runtime

Examples of org.antlr.v4.runtime.TokenStream.LT()

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        assertEquals(Token.EOF, tokens.LA(1));
        assertEquals(";", tokens.LT(-1).getText());

        assertEquals("34", tokens.LT(-2).getText());
        assertEquals("=", tokens.LT(-3).getText());
        assertEquals("x", tokens.LT(-4).getText());
    }

  @Test public void testFetchOffChannel() throws Exception {
    TokenSource lexer = // simulate input " x =34  ; \n"
                        // token indexes   01234 56789
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    TestingUnbufferedCharStream input = createStream("x = 302 * 91 + 20234234 * 0;");
        LexerInterpreter lexEngine = g.createLexerInterpreter(input);
    // copy text into tokens from char stream
    lexEngine.setTokenFactory(new CommonTokenFactory(true));
    CommonTokenStream tokens = new CommonTokenStream(lexEngine);
        String result = tokens.LT(1).getText();
        String expecting = "x";
        assertEquals(expecting, result);
    tokens.fill();
    expecting =
      "[[@0,0:0='x',<1>,1:0], [@1,1:1=' ',<7>,1:1], [@2,2:2='=',<4>,1:2]," +
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      new StringReader("x = 302;")
    );
        LexerInterpreter lexEngine = g.createLexerInterpreter(input);
        TokenStream tokens = new UnbufferedTokenStream<Token>(lexEngine);

    assertEquals("x", tokens.LT(1).getText());
    assertEquals(" ", tokens.LT(2).getText());
    assertEquals("=", tokens.LT(3).getText());
    assertEquals(" ", tokens.LT(4).getText());
    assertEquals("302", tokens.LT(5).getText());
    assertEquals(";", tokens.LT(6).getText());
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    );
        LexerInterpreter lexEngine = g.createLexerInterpreter(input);
        TokenStream tokens = new UnbufferedTokenStream<Token>(lexEngine);

    assertEquals("x", tokens.LT(1).getText());
    assertEquals(" ", tokens.LT(2).getText());
    assertEquals("=", tokens.LT(3).getText());
    assertEquals(" ", tokens.LT(4).getText());
    assertEquals("302", tokens.LT(5).getText());
    assertEquals(";", tokens.LT(6).getText());
    }
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        LexerInterpreter lexEngine = g.createLexerInterpreter(input);
        TokenStream tokens = new UnbufferedTokenStream<Token>(lexEngine);

    assertEquals("x", tokens.LT(1).getText());
    assertEquals(" ", tokens.LT(2).getText());
    assertEquals("=", tokens.LT(3).getText());
    assertEquals(" ", tokens.LT(4).getText());
    assertEquals("302", tokens.LT(5).getText());
    assertEquals(";", tokens.LT(6).getText());
    }
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        TokenStream tokens = new UnbufferedTokenStream<Token>(lexEngine);

    assertEquals("x", tokens.LT(1).getText());
    assertEquals(" ", tokens.LT(2).getText());
    assertEquals("=", tokens.LT(3).getText());
    assertEquals(" ", tokens.LT(4).getText());
    assertEquals("302", tokens.LT(5).getText());
    assertEquals(";", tokens.LT(6).getText());
    }

  @Test public void testNoBuffering() throws Exception {
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    assertEquals("x", tokens.LT(1).getText());
    assertEquals(" ", tokens.LT(2).getText());
    assertEquals("=", tokens.LT(3).getText());
    assertEquals(" ", tokens.LT(4).getText());
    assertEquals("302", tokens.LT(5).getText());
    assertEquals(";", tokens.LT(6).getText());
    }

  @Test public void testNoBuffering() throws Exception {
        LexerGrammar g = new LexerGrammar(
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    assertEquals("x", tokens.LT(1).getText());
    assertEquals(" ", tokens.LT(2).getText());
    assertEquals("=", tokens.LT(3).getText());
    assertEquals(" ", tokens.LT(4).getText());
    assertEquals("302", tokens.LT(5).getText());
    assertEquals(";", tokens.LT(6).getText());
    }

  @Test public void testNoBuffering() throws Exception {
        LexerGrammar g = new LexerGrammar(
            "lexer grammar t;\n"+
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        // Input:  x = 3 * 0 + 2 * 0;
        CharStream input = new ANTLRInputStream("x = 3 * 0 + 2 * 0;");
        LexerInterpreter lexEngine = g.createLexerInterpreter(input);
        TokenStream tokens = createTokenStream(lexEngine);

        String result = tokens.LT(1).getText();
        String expecting = "x";
        assertEquals(expecting, result);
    }

    @Test public void test2ndToken() throws Exception {
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        // Input:  x = 3 * 0 + 2 * 0;
        CharStream input = new ANTLRInputStream("x = 3 * 0 + 2 * 0;");
        LexerInterpreter lexEngine = g.createLexerInterpreter(input);
        TokenStream tokens = createTokenStream(lexEngine);

        String result = tokens.LT(2).getText();
        String expecting = " ";
        assertEquals(expecting, result);
    }

    @Test public void testCompleteBuffer() throws Exception {
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