Examples of org.antlr.runtime.tree.TreeNodeStream.LT()

org.antlr.runtime.tree.TreeNodeStream.LT()

Get tree node at current input pointer + {@code k} ahead where{@code k==1} is next node. {@code k<0} indicates nodes in the past. So{@code LT(-1)} is previous node, but implementations are not required toprovide results for {@code k < -1}. {@code LT(0)} is undefined. For{@code k<=n}, return {@code null}. Return {@code null} for {@code LT(0)}and any index that results in an absolute address that is negative.

This is analogous to {@link TokenStream#LT}, but this returns a tree node instead of a {@link Token}. Makes code generation identical for both parser and tree grammars.

        TreeNodeStream stream = newStream(r0);
        stream.consume(); // consume 101
        stream.consume(); // consume DN
        stream.consume(); // consume 102
        stream.seek(7);   // seek to 107
        assertEquals(107, ((Tree)stream.LT(1)).getType());
        stream.consume(); // consume 107
        stream.consume(); // consume UP
        stream.consume(); // consume UP
        assertEquals(104, ((Tree)stream.LT(1)).getType());
    }

        stream.seek(7);   // seek to 107
        assertEquals(107, ((Tree)stream.LT(1)).getType());
        stream.consume(); // consume 107
        stream.consume(); // consume UP
        stream.consume(); // consume UP
        assertEquals(104, ((Tree)stream.LT(1)).getType());
    }    
}

        TreeNodeStream stream = newStream(r0);
        stream.consume(); // consume 101
        stream.consume(); // consume DN
        stream.consume(); // consume 102
        stream.seek(7);   // seek to 107
        assertEquals(107, ((Tree)stream.LT(1)).getType());
        stream.consume(); // consume 107
        stream.consume(); // consume UP
        stream.consume(); // consume UP
        assertEquals(104, ((Tree)stream.LT(1)).getType());
    }

        stream.seek(7);   // seek to 107
        assertEquals(107, ((Tree)stream.LT(1)).getType());
        stream.consume(); // consume 107
        stream.consume(); // consume UP
        stream.consume(); // consume UP
        assertEquals(104, ((Tree)stream.LT(1)).getType());
    }    
}

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