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1
5 package org.h2.bnf;
6
7 import java.util.HashMap  ;
8
9 public class RuleOptional implements Rule {
10 private Rule rule;
11 private boolean mapSet;
12
13 RuleOptional(Rule rule, boolean repeat) {
14 this.rule = rule;
15 }
16
17 public String name() {
18 return null;
19 }
20
21 public String random(Bnf config, int level) {
22 if(level > 10 ? config.getRandom().nextInt(level) == 1 : config.getRandom().nextBoolean()) {
23 return rule.random(config, level+1);
24 } else {
25 return "";
26 }
27 }
28
29 public Rule last() {
30 return this;
31 }
32
33 public void setLinks(HashMap ruleMap) {
34 if(!mapSet) {
35 rule.setLinks(ruleMap);
36 mapSet = true;
37 }
38 }
39
40 public String matchRemove(String query, Sentence sentence) {
41 if(sentence.stop()) {
42 return null;
43 }
44 if(query.length()==0) {
45 return query;
46 }
47 String s = rule.matchRemove(query, sentence);
48 if(s == null) {
49 return query;
50 }
51 return s;
52 }
53
54
55 public void addNextTokenList(String query, Sentence sentence) {
56 if(sentence.stop()) {
57 return;
58 }
59 rule.addNextTokenList(query, sentence);
60 }
61
62 }
63 |
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