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16 package org.yaml.snakeyaml.resolver;
17
18 import java.util.ArrayList;
19 import java.util.HashMap;
20 import java.util.List;
21 import java.util.Map;
22 import java.util.regex.Pattern;
23
24 import org.yaml.snakeyaml.nodes.NodeId;
25 import org.yaml.snakeyaml.nodes.Tag;
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30
31 public class Resolver {
32 public static final Pattern BOOL = Pattern
33 .compile("^(?:yes|Yes|YES|no|No|NO|true|True|TRUE|false|False|FALSE|on|On|ON|off|Off|OFF)$");
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38
39 public static final Pattern FLOAT = Pattern
40 .compile("^([-+]?(\\.[0-9]+|[0-9_]+(\\.[0-9_]*)?)([eE][-+]?[0-9]+)?|[-+]?[0-9][0-9_]*(?::[0-5]?[0-9])+\\.[0-9_]*|[-+]?\\.(?:inf|Inf|INF)|\\.(?:nan|NaN|NAN))$");
41 public static final Pattern INT = Pattern
42 .compile("^(?:[-+]?0b[0-1_]+|[-+]?0[0-7_]+|[-+]?(?:0|[1-9][0-9_]*)|[-+]?0x[0-9a-fA-F_]+|[-+]?[1-9][0-9_]*(?::[0-5]?[0-9])+)$");
43 public static final Pattern MERGE = Pattern.compile("^(?:<<)$");
44 public static final Pattern NULL = Pattern.compile("^(?:~|null|Null|NULL| )$");
45 public static final Pattern EMPTY = Pattern.compile("^$");
46 public static final Pattern TIMESTAMP = Pattern
47 .compile("^(?:[0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]|[0-9][0-9][0-9][0-9]-[0-9][0-9]?-[0-9][0-9]?(?:[Tt]|[ \t]+)[0-9][0-9]?:[0-9][0-9]:[0-9][0-9](?:\\.[0-9]*)?(?:[ \t]*(?:Z|[-+][0-9][0-9]?(?::[0-9][0-9])?))?)$");
48 public static final Pattern VALUE = Pattern.compile("^(?:=)$");
49 public static final Pattern YAML = Pattern.compile("^(?:!|&|\\*)$");
50
51 protected Map<Character, List<ResolverTuple>> yamlImplicitResolvers = new HashMap<Character, List<ResolverTuple>>();
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60 public Resolver(boolean respectDefaultImplicitScalars) {
61 if (respectDefaultImplicitScalars) {
62 addImplicitResolvers();
63 }
64 }
65
66 protected void addImplicitResolvers() {
67 addImplicitResolver(Tag.BOOL, BOOL, "yYnNtTfFoO");
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72
73 addImplicitResolver(Tag.INT, INT, "-+0123456789");
74 addImplicitResolver(Tag.FLOAT, FLOAT, "-+0123456789.");
75 addImplicitResolver(Tag.MERGE, MERGE, "<");
76 addImplicitResolver(Tag.NULL, NULL, "~nN\0");
77 addImplicitResolver(Tag.NULL, EMPTY, null);
78 addImplicitResolver(Tag.TIMESTAMP, TIMESTAMP, "0123456789");
79 addImplicitResolver(Tag.VALUE, VALUE, "=");
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84 addImplicitResolver(Tag.YAML, YAML, "!&*");
85 }
86
87 public Resolver() {
88 this(true);
89 }
90
91 public void addImplicitResolver(Tag tag, Pattern regexp, String first) {
92 if (first == null) {
93 List<ResolverTuple> curr = yamlImplicitResolvers.get(null);
94 if (curr == null) {
95 curr = new ArrayList<ResolverTuple>();
96 yamlImplicitResolvers.put(null, curr);
97 }
98 curr.add(new ResolverTuple(tag, regexp));
99 } else {
100 char[] chrs = first.toCharArray();
101 for (int i = 0, j = chrs.length; i < j; i++) {
102 Character theC = Character.valueOf(chrs[i]);
103 if (theC == 0) {
104
105 theC = null;
106 }
107 List<ResolverTuple> curr = yamlImplicitResolvers.get(theC);
108 if (curr == null) {
109 curr = new ArrayList<ResolverTuple>();
110 yamlImplicitResolvers.put(theC, curr);
111 }
112 curr.add(new ResolverTuple(tag, regexp));
113 }
114 }
115 }
116
117 public Tag resolve(NodeId kind, String value, boolean implicit) {
118 if (kind == NodeId.scalar && implicit) {
119 List<ResolverTuple> resolvers = null;
120 if (value.length() == 0) {
121 resolvers = yamlImplicitResolvers.get('\0');
122 } else {
123 resolvers = yamlImplicitResolvers.get(value.charAt(0));
124 }
125 if (resolvers != null) {
126 for (ResolverTuple v : resolvers) {
127 Tag tag = v.getTag();
128 Pattern regexp = v.getRegexp();
129 if (regexp.matcher(value).matches()) {
130 return tag;
131 }
132 }
133 }
134 if (yamlImplicitResolvers.containsKey(null)) {
135 for (ResolverTuple v : yamlImplicitResolvers.get(null)) {
136 Tag tag = v.getTag();
137 Pattern regexp = v.getRegexp();
138 if (regexp.matcher(value).matches()) {
139 return tag;
140 }
141 }
142 }
143 }
144 switch (kind) {
145 case scalar:
146 return Tag.STR;
147 case sequence:
148 return Tag.SEQ;
149 default:
150 return Tag.MAP;
151 }
152 }
153 }