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.RpnNode;
37 import jp.sourceforge.rpn_computer.token.MinusToken;
38 import jp.sourceforge.rpn_computer.token.MinusTokenInfo;
39 import jp.sourceforge.rpn_computer.token.PlusToken;
40 import jp.sourceforge.rpn_computer.token.PlusTokenInfo;
41 import jp.sourceforge.rpn_computer.token.SkipTokenInfo;
42 import jp.sourceforge.tokenizer.Token;
43 import jp.sourceforge.tokenizer.TokenInfo;
44 import jp.sourceforge.tokenizer.Tokenizer;
45
46 /**
47 * <p>
48 * AdditiveExpressionを表すノードです。
49 * </p>
50 *
51 * @author uguu@users.sourceforge.jp
52 */
53 public final class AdditiveExpressionNode extends AbstractNode {
54
55 /**
56 * {@inheritDoc}
57 */
58 public void parse(Tokenizer tokenizer) {
59 RpnNode node = new MultiplicativeExpressionNode();
60 node.parse(tokenizer);
61 this.addNode(node);
62
63 TokenInfo[] readTokenInfos = new TokenInfo[] { new PlusTokenInfo(), new MinusTokenInfo(), };
64 TokenInfo[] skipTokenInfos = new TokenInfo[] { new SkipTokenInfo(), };
65 if (tokenizer.read(readTokenInfos, skipTokenInfos)) {
66 Token token = tokenizer.current();
67 if (token instanceof PlusToken) {
68 node = new AddNode();
69 } else if (token instanceof MinusToken) {
70 node = new SubtractNode();
71 } else {
72 throw new ParseException(token, readTokenInfos);
73 }
74 node.parse(tokenizer);
75 this.addNode(node);
76
77 node = new AdditiveExpressionNode();
78 node.parse(tokenizer);
79 this.addNode(node);
80 }
81 }
82
83 /**
84 * {@inheritDoc}
85 */
86 public String toString() {
87 return "additive expression\n" + this.toChildrenString();
88 }
89
90 /**
91 * {@inheritDoc}
92 */
93 public void compile(RpnCompileContext context) {
94 RpnNode[] nodes = this.getChildren();
95
96 if (nodes.length == 1) {
97 nodes[0].compile(context);
98 } else {
99 nodes[0].compile(context);
100 nodes[2].compile(context);
101 nodes[1].compile(context);
102 }
103 }
104 }