1 /*
2 * Copyright (C) 2006 uguu@users.sourceforge.jp, All Rights Reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *
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 *
15 * 3. Neither the name of Clarkware Consulting, Inc. nor the names of its
16 * contributors may be used to endorse or promote products derived
17 * from this software without prior written permission. For written
18 * permission, please contact clarkware@clarkware.com.
19 *
20 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
21 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
22 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
23 * CLARKWARE CONSULTING OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
26 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
27 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
29 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 package jp.sourceforge.rpn_computer.node;
33
34 import jp.sourceforge.rpn_computer.ParseException;
35 import jp.sourceforge.rpn_computer.RpnCompileContext;
36 import jp.sourceforge.rpn_computer.command.PreSubtractCommand;
37 import jp.sourceforge.rpn_computer.token.MinusToken;
38 import jp.sourceforge.rpn_computer.token.MinusTokenInfo;
39 import jp.sourceforge.tokenizer.Token;
40 import jp.sourceforge.tokenizer.TokenInfo;
41 import jp.sourceforge.tokenizer.Tokenizer;
42
43 /**
44 * <p>
45 * 単項減算演算子を表すノードです。
46 * </p>
47 *
48 * @author uguu@users.sourceforge.jp
49 */
50 public final class PreSubtractNode extends AbstractNode {
51
52 /**
53 * {@inheritDoc}
54 */
55 public void parse(Tokenizer tokenizer) {
56 Token token = tokenizer.current();
57 if (!(token instanceof MinusToken)) {
58 throw new ParseException(token, new TokenInfo[] { new MinusTokenInfo() });
59 }
60 }
61
62 /**
63 * {@inheritDoc}
64 */
65 public String toString() {
66 return "pre subtract[-]";
67 }
68
69 /**
70 * {@inheritDoc}
71 */
72 public void compile(RpnCompileContext context) {
73 context.add(new PreSubtractCommand());
74 }
75 }