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/**
* Copyright (c) 2008, SnakeYAML
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
* in compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
*/
package org.yaml.snakeyaml.resolver;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.regex.Pattern;
import org.yaml.snakeyaml.nodes.NodeId;
import org.yaml.snakeyaml.nodes.Tag;
/**
* Resolver tries to detect a type by content (when the tag is implicit)
*/
public class Resolver {
public static final Pattern BOOL = Pattern
.compile("^(?:yes|Yes|YES|no|No|NO|true|True|TRUE|false|False|FALSE|on|On|ON|off|Off|OFF)$");
/**
* The regular expression is taken from the 1.2 specification but '_'s are added to keep backwards
* compatibility
*/
public static final Pattern FLOAT =
Pattern.compile("^(" + "[-+]?(?:[0-9][0-9_]*)\\.[0-9_]*(?:[eE][-+]?[0-9]+)?" + // (base 10)
"|[-+]?(?:[0-9][0-9_]*)(?:[eE][-+]?[0-9]+)" + // (base 10, scientific notation without .)
"|[-+]?\\.[0-9_]+(?:[eE][-+]?[0-9]+)?" + // (base 10, starting with .)
"|[-+]?[0-9][0-9_]*(?::[0-5]?[0-9])+\\.[0-9_]*" + // (base 60)
"|[-+]?\\.(?:inf|Inf|INF)" + "|\\.(?:nan|NaN|NAN)" + ")$");
public static final Pattern INT = Pattern.compile("^(?:" + "[-+]?0b_*[0-1][0-1_]*" + // (base 2)
"|[-+]?0_*[0-7][0-7_]*" + // (base 8)
"|[-+]?(?:0|[1-9][0-9_]*)" + // (base 10)
"|[-+]?0x_*[0-9a-fA-F][0-9a-fA-F_]*" + // (base 16)
"|[-+]?[1-9][0-9_]*(?::[0-5]?[0-9])+" + // (base 60)
")$");
public static final Pattern MERGE = Pattern.compile("^(?:<<)$");
public static final Pattern NULL = Pattern.compile("^(?:~|null|Null|NULL| )$");
public static final Pattern EMPTY = Pattern.compile("^$");
public static final Pattern TIMESTAMP = Pattern.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])?))?)$");
public static final Pattern VALUE = Pattern.compile("^(?:=)$");
public static final Pattern YAML = Pattern.compile("^(?:!|&|\\*)$");
protected Map<Character, List<ResolverTuple>> yamlImplicitResolvers =
new HashMap<Character, List<ResolverTuple>>();
protected void addImplicitResolvers() {
addImplicitResolver(Tag.BOOL, BOOL, "yYnNtTfFoO", 10);
/*
* INT must be before FLOAT because the regular expression for FLOAT matches INT (see issue 130)
* http://code.google.com/p/snakeyaml/issues/detail?id=130
*/
addImplicitResolver(Tag.INT, INT, "-+0123456789");
addImplicitResolver(Tag.FLOAT, FLOAT, "-+0123456789.");
addImplicitResolver(Tag.MERGE, MERGE, "<", 10);
addImplicitResolver(Tag.NULL, NULL, "~nN\0", 10);
addImplicitResolver(Tag.NULL, EMPTY, null, 10);
addImplicitResolver(Tag.TIMESTAMP, TIMESTAMP, "0123456789", 50);
// The following implicit resolver is only for documentation purposes.
// It cannot work because plain scalars cannot start with '!', '&', or '*'.
addImplicitResolver(Tag.YAML, YAML, "!&*", 10);
}
public Resolver() {
addImplicitResolvers();
}
public void addImplicitResolver(Tag tag, Pattern regexp, String first) {
addImplicitResolver(tag, regexp, first, 1024);
}
public void addImplicitResolver(Tag tag, Pattern regexp, String first, int limit) {
if (first == null) {
List<ResolverTuple> curr = yamlImplicitResolvers.get(null);
if (curr == null) {
curr = new ArrayList<ResolverTuple>();
yamlImplicitResolvers.put(null, curr);
}
curr.add(new ResolverTuple(tag, regexp, limit));
} else {
char[] chrs = first.toCharArray();
for (int i = 0, j = chrs.length; i < j; i++) {
Character theC = Character.valueOf(chrs[i]);
if (theC == 0) {
// special case: for null
theC = null;
}
List<ResolverTuple> curr = yamlImplicitResolvers.get(theC);
if (curr == null) {
curr = new ArrayList<ResolverTuple>();
yamlImplicitResolvers.put(theC, curr);
}
curr.add(new ResolverTuple(tag, regexp, limit));
}
}
}
public Tag resolve(NodeId kind, String value, boolean implicit) {
if (kind == NodeId.scalar && implicit) {
final List<ResolverTuple> resolvers;
if (value.length() == 0) {
resolvers = yamlImplicitResolvers.get('\0');
} else {
resolvers = yamlImplicitResolvers.get(value.charAt(0));
}
if (resolvers != null) {
for (ResolverTuple v : resolvers) {
Tag tag = v.getTag();
Pattern regexp = v.getRegexp();
if (value.length() <= v.getLimit() && regexp.matcher(value).matches()) {
return tag;
}
}
}
if (yamlImplicitResolvers.containsKey(null)) {
// check null resolver
for (ResolverTuple v : yamlImplicitResolvers.get(null)) {
Tag tag = v.getTag();
Pattern regexp = v.getRegexp();
if (value.length() <= v.getLimit() && regexp.matcher(value).matches()) {
return tag;
}
}
}
}
switch (kind) {
case scalar:
return Tag.STR;
case sequence:
return Tag.SEQ;
default:
return Tag.MAP;
}
}
}
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