1 /* 2 * [The "BSD license"] 3 * Copyright (c) 2010 Terence Parr 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 package org.antlr.test; 29 30 import org.antlr.runtime.CommonToken; 31 import org.antlr.runtime.tree.BufferedTreeNodeStream; 32 import org.antlr.runtime.tree.CommonTree; 33 import org.antlr.runtime.tree.Tree; 34 import org.antlr.runtime.tree.TreeNodeStream; 35 import org.junit.Test; 36 37 public class TestBufferedTreeNodeStream extends TestTreeNodeStream { 38 // inherits tests; these methods make it use a new buffer 39 40 public TreeNodeStream newStream(Object t) { 41 return new BufferedTreeNodeStream(t); 42 } 43 44 public String toTokenTypeString(TreeNodeStream stream) { 45 return ((BufferedTreeNodeStream)stream).toTokenTypeString(); 46 } 47 48 @Test public void testSeek() throws Exception { 49 // ^(101 ^(102 103 ^(106 107) ) 104 105) 50 // stream has 7 real + 6 nav nodes 51 // Sequence of types: 101 DN 102 DN 103 106 DN 107 UP UP 104 105 UP EOF 52 Tree r0 = new CommonTree(new CommonToken(101)); 53 Tree r1 = new CommonTree(new CommonToken(102)); 54 r0.addChild(r1); 55 r1.addChild(new CommonTree(new CommonToken(103))); 56 Tree r2 = new CommonTree(new CommonToken(106)); 57 r2.addChild(new CommonTree(new CommonToken(107))); 58 r1.addChild(r2); 59 r0.addChild(new CommonTree(new CommonToken(104))); 60 r0.addChild(new CommonTree(new CommonToken(105))); 61 62 TreeNodeStream stream = newStream(r0); 63 stream.consume(); // consume 101 64 stream.consume(); // consume DN 65 stream.consume(); // consume 102 66 stream.seek(7); // seek to 107 67 assertEquals(107, ((Tree)stream.LT(1)).getType()); 68 stream.consume(); // consume 107 69 stream.consume(); // consume UP 70 stream.consume(); // consume UP 71 assertEquals(104, ((Tree)stream.LT(1)).getType()); 72 } 73 } 74
