/*
* [The "BSD license"]
* Copyright (c) 2010 Terence Parr
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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package org.antlr.test;
import org.antlr.runtime.CommonToken;
import org.antlr.runtime.tree.BufferedTreeNodeStream;
import org.antlr.runtime.tree.CommonTree;
import org.antlr.runtime.tree.Tree;
import org.antlr.runtime.tree.TreeNodeStream;
import org.junit.Test;
import static org.junit.Assert.*;
public class TestBufferedTreeNodeStream extends TestTreeNodeStream {
// inherits tests; these methods make it use a new buffer
@Override
public TreeNodeStream newStream(Object t) {
return new BufferedTreeNodeStream(t);
}
@Override
public String toTokenTypeString(TreeNodeStream stream) {
return ((BufferedTreeNodeStream)stream).toTokenTypeString();
}
@Test public void testSeek() throws Exception {
// ^(101 ^(102 103 ^(106 107) ) 104 105)
// stream has 7 real + 6 nav nodes
// Sequence of types: 101 DN 102 DN 103 106 DN 107 UP UP 104 105 UP EOF
Tree r0 = new CommonTree(new CommonToken(101));
Tree r1 = new CommonTree(new CommonToken(102));
r0.addChild(r1);
r1.addChild(new CommonTree(new CommonToken(103)));
Tree r2 = new CommonTree(new CommonToken(106));
r2.addChild(new CommonTree(new CommonToken(107)));
r1.addChild(r2);
r0.addChild(new CommonTree(new CommonToken(104)));
r0.addChild(new CommonTree(new CommonToken(105)));
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());
}
}