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

org.antlr.v4.runtime.TokenStream.LT()
Get the {@link Token} instance associated with the value returned by{@link #LA LA(k)}. This method has the same pre- and post-conditions as {@link IntStream#LA}. In addition, when the preconditions of this method are met, the return value is non-null and the value of {@code LT(k).getType()==LA(k)}. @see IntStream#LA

        CharStream input = new ANTLRInputStream("x = 3 * 0 + 2 * 0;");
        LexerInterpreter lexEngine = g.createLexerInterpreter(input);
        TokenStream tokens = createTokenStream(lexEngine);


        int i = 1;
        Token t = tokens.LT(i);
        while ( t.getType()!=Token.EOF ) {
            i++;
            t = tokens.LT(i);
        }
        tokens.LT(i++); // push it past end

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        int i = 1;
        Token t = tokens.LT(i);
        while ( t.getType()!=Token.EOF ) {
            i++;
            t = tokens.LT(i);
        }
        tokens.LT(i++); // push it past end
        tokens.LT(i++);


        String result = tokens.getText();

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        Token t = tokens.LT(i);
        while ( t.getType()!=Token.EOF ) {
            i++;
            t = tokens.LT(i);
        }
        tokens.LT(i++); // push it past end
        tokens.LT(i++);


        String result = tokens.getText();
        String expecting = "x = 3 * 0 + 2 * 0;";
        assertEquals(expecting, result);

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        while ( t.getType()!=Token.EOF ) {
            i++;
            t = tokens.LT(i);
        }
        tokens.LT(i++); // push it past end
        tokens.LT(i++);


        String result = tokens.getText();
        String expecting = "x = 3 * 0 + 2 * 0;";
        assertEquals(expecting, result);
    }

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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);


        Token t = tokens.LT(1);
        while ( t.getType()!=Token.EOF ) {
            tokens.consume();
            t = tokens.LT(1);
        }

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        TokenStream tokens = createTokenStream(lexEngine);


        Token t = tokens.LT(1);
        while ( t.getType()!=Token.EOF ) {
            tokens.consume();
            t = tokens.LT(1);
        }


        String result = tokens.getText();
        String expecting = "x = 3 * 0 + 2 * 0;";
        assertEquals(expecting, result);

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        CharStream input = new ANTLRInputStream("x = 3 * 0 + 2 * 0;");
        LexerInterpreter lexEngine = g.createLexerInterpreter(input);
        TokenStream tokens = createTokenStream(lexEngine);


        tokens.consume(); // get x into buffer
        Token t = tokens.LT(-1);
        assertEquals("x", t.getText());


        tokens.consume();
        tokens.consume(); // consume '='
        t = tokens.LT(-3);

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        Token t = tokens.LT(-1);
        assertEquals("x", t.getText());


        tokens.consume();
        tokens.consume(); // consume '='
        t = tokens.LT(-3);
        assertEquals("x", t.getText());
        t = tokens.LT(-2);
        assertEquals(" ", t.getText());
        t = tokens.LT(-1);
        assertEquals("=", t.getText());

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        tokens.consume();
        tokens.consume(); // consume '='
        t = tokens.LT(-3);
        assertEquals("x", t.getText());
        t = tokens.LT(-2);
        assertEquals(" ", t.getText());
        t = tokens.LT(-1);
        assertEquals("=", t.getText());
    }

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        tokens.consume(); // consume '='
        t = tokens.LT(-3);
        assertEquals("x", t.getText());
        t = tokens.LT(-2);
        assertEquals(" ", t.getText());
        t = tokens.LT(-1);
        assertEquals("=", t.getText());
    }


}

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