# YAML Test Matrix

--- &test-6M2F
  Title: Aliases in Explicit Block Mapping
  Tags: [ alias, empty-key, explicit-key ]

YAML

? &a a
: &b b
: *a

Expected Events

+STR
+DOC
+MAP
=VAL &a :a
=VAL &b :b
=VAL :
=ALI *a
-MAP
-DOC
-STR

Expected JSON



c-libfyaml-event

 ok

cpp-rapidyaml-event

 ok

cpp-yamlcpp-event

 ok

dotnet-yamldotnet-event

 ok

hs-hsyaml-event

 ok

js-yaml-event

 ok

nim-nimyaml-event

 ok

perl-pp-event

 ok

perl-refparser-event

 ok

py-ruamel-event

 ok

rust-yamlrust-event

 ok

java-snakeengine-event

 error
Exception in thread "main" while parsing a block mapping
 in reader, line 1, column 1:
    ? &a a
    ^
expected <block end>, but found ':'
 in reader, line 3, column 1:
    : *a
    ^

	at org.snakeyaml.engine.v2.parser.ParserImpl$ParseBlockMappingKey.produce(ParserImpl.java:689)
	at org.snakeyaml.engine.v2.parser.ParserImpl.lambda$produce$0(ParserImpl.java:185)
	at java.util.Optional.ifPresent(Optional.java:159)
	at org.snakeyaml.engine.v2.parser.ParserImpl.produce(ParserImpl.java:185)
	at org.snakeyaml.engine.v2.parser.ParserImpl.hasNext(ParserImpl.java:210)
	at org.yaml.editor.SnakeEngine2Events.yamlToEvents(SnakeEngine2Events.java:15)
	at org.yaml.editor.SnakeEngine2Events.main(SnakeEngine2Events.java:23)

perl-syck-perl

 error
Syck parser (line 3, column 1): syntax error at /perl5/lib/perl5/x86_64-linux-thread-multi/YAML/Syck.pm line 60, <> line 1.

raku-yamlish-raku

 error
Couldn't parse YAML
  in sub load-yamls at /raku/sources/44795C7AB0F35700F4CA9C3E2CC5C924EE4C608F (YAMLish) line 959
  in block <unit> at /yaml/bin/raku-yamlish-raku line 6

c-libfyaml-json

 na
{
  "a": "b",
  "": "a"
}

dotnet-yamldotnet-json

 na
Unhandled exception. YamlDotNet.Core.YamlException: (Line: 1, Col: 1, Idx: 0) - (Line: 1, Col: 1, Idx: 0): Exception during deserialization
 ---> System.ArgumentNullException: Value cannot be null. (Parameter 'key')
   at System.Collections.Generic.Dictionary`2.System.Collections.IDictionary.set_Item(Object key, Object value)
   at YamlDotNet.Serialization.NodeDeserializers.DictionaryNodeDeserializer.DeserializeHelper(Type tKey, Type tValue, IParser parser, Func`3 nestedObjectDeserializer, IDictionary result)
   at YamlDotNet.Serialization.NodeDeserializers.DictionaryNodeDeserializer.YamlDotNet.Serialization.INodeDeserializer.Deserialize(IParser parser, Type expectedType, Func`3 nestedObjectDeserializer, Object& value)
   at YamlDotNet.Serialization.ValueDeserializers.NodeValueDeserializer.DeserializeValue(IParser parser, Type expectedType, SerializerState state, IValueDeserializer nestedObjectDeserializer)
   --- End of inner exception stack trace ---
   at YamlDotNet.Serialization.ValueDeserializers.NodeValueDeserializer.DeserializeValue(IParser parser, Type expectedType, SerializerState state, IValueDeserializer nestedObjectDeserializer)
   at YamlDotNet.Serialization.ValueDeserializers.AliasValueDeserializer.DeserializeValue(IParser parser, Type expectedType, SerializerState state, IValueDeserializer nestedObjectDeserializer)
   at YamlDotNet.Serialization.Deserializer.Deserialize(IParser parser, Type type)
   at YamlDotNet.Serialization.Deserializer.Deserialize(TextReader input, Type type)
   at YamlDotNet.Serialization.Deserializer.Deserialize(TextReader input)
   at Program.Main(String[] commandLineArguments)
Aborted (core dumped)

go-yaml-json

 na
yaml: line 2: did not find expected key

hs-hsyaml-json

 na
{"":"a","a":"b"}

hs-reference-yeast

 na
Line  Col Char Byte Token|Content
   1    0    0    0 +DOC |
   1    0    0    0 +NODE|
   1    0    0    0 +MAP |
   1    0    0    0 +PAIR|
   1    0    0    0 =SYNX|?
   1    1    1    1 =WSPC|.
   1    2    2    2 +NODE|
   1    2    2    2 +PROP|
   1    2    2    2 +ANCH|
   1    2    2    2 =SYNX|&
   1    3    3    3 =META|a
   1    4    4    4 -ANCH|
   1    4    4    4 -PROP|
   1    4    4    4 =WSPC|.
   1    5    5    5 +VAL |
   1    5    5    5 =TEXT|a
   1    6    6    6 -VAL |
   1    6    6    6 -NODE|
   1    6    6    6 =EOL |\x0a
   2    0    7    7 =SYNX|:
   2    1    8    8 =WSPC|.
   2    2    9    9 +NODE|
   2    2    9    9 +PROP|
   2    2    9    9 +ANCH|
   2    2    9    9 =SYNX|&
   2    3   10   10 =META|b
   2    4   11   11 -ANCH|
   2    4   11   11 -PROP|
   2    4   11   11 =WSPC|.
   2    5   12   12 +VAL |
   2    5   12   12 =TEXT|b
   2    6   13   13 -VAL |
   2    6   13   13 -NODE|
   2    6   13   13 =EOL |\x0a
   3    0   14   14 -PAIR|
   3    0   14   14 +PAIR|
   3    0   14   14 +NODE|
   3    0   14   14 +VAL |
   3    0   14   14 -VAL |
   3    0   14   14 -NODE|
   3    0   14   14 =SYNX|:
   3    1   15   15 =WSPC|.
   3    2   16   16 +NODE|
   3    2   16   16 +ALI |
   3    2   16   16 =SYNX|*
   3    3   17   17 =META|a
   3    4   18   18 -ALI |
   3    4   18   18 -NODE|
   3    4   18   18 =EOL |\x0a
   4    0   19   19 -PAIR|
   4    0   19   19 -MAP |
   4    0   19   19 -NODE|
   4    0   19   19 -DOC |

java-snakeengine-json

 na
Exception in thread "main" while parsing a block mapping
 in 'reader', line 1, column 1:
    ? &a a
    ^
expected <block end>, but found ':'
 in 'reader', line 3, column 1:
    : *a
    ^

	at org.yaml.snakeyaml.parser.ParserImpl$ParseBlockMappingKey.produce(ParserImpl.java:660)
	at org.yaml.snakeyaml.parser.ParserImpl.peekEvent(ParserImpl.java:166)
	at org.yaml.snakeyaml.comments.CommentEventsCollector$1.peek(CommentEventsCollector.java:59)
	at org.yaml.snakeyaml.comments.CommentEventsCollector$1.peek(CommentEventsCollector.java:45)
	at org.yaml.snakeyaml.comments.CommentEventsCollector.collectEvents(CommentEventsCollector.java:140)
	at org.yaml.snakeyaml.comments.CommentEventsCollector.collectEvents(CommentEventsCollector.java:119)
	at org.yaml.snakeyaml.composer.Composer.composeScalarNode(Composer.java:217)
	at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:187)
	at org.yaml.snakeyaml.composer.Composer.composeValueNode(Composer.java:317)
	at org.yaml.snakeyaml.composer.Composer.composeMappingChildren(Composer.java:308)
	at org.yaml.snakeyaml.composer.Composer.composeMappingNode(Composer.java:289)
	at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:191)
	at org.yaml.snakeyaml.composer.Composer.getNode(Composer.java:116)
	at org.yaml.snakeyaml.constructor.BaseConstructor.getData(BaseConstructor.java:135)
	at org.yaml.snakeyaml.Yaml$1.next(Yaml.java:514)
	at org.yaml.editor.Snake2Json.yamlToJson(Snake2Json.java:20)
	at org.yaml.editor.Snake2Json.main(Snake2Json.java:27)

java-snakeyaml-json

 na
Exception in thread "main" while parsing a block mapping
 in 'reader', line 1, column 1:
    ? &a a
    ^
expected <block end>, but found ':'
 in 'reader', line 3, column 1:
    : *a
    ^

	at org.yaml.snakeyaml.parser.ParserImpl$ParseBlockMappingKey.produce(ParserImpl.java:660)
	at org.yaml.snakeyaml.parser.ParserImpl.peekEvent(ParserImpl.java:166)
	at org.yaml.snakeyaml.comments.CommentEventsCollector$1.peek(CommentEventsCollector.java:59)
	at org.yaml.snakeyaml.comments.CommentEventsCollector$1.peek(CommentEventsCollector.java:45)
	at org.yaml.snakeyaml.comments.CommentEventsCollector.collectEvents(CommentEventsCollector.java:140)
	at org.yaml.snakeyaml.comments.CommentEventsCollector.collectEvents(CommentEventsCollector.java:119)
	at org.yaml.snakeyaml.composer.Composer.composeScalarNode(Composer.java:217)
	at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:187)
	at org.yaml.snakeyaml.composer.Composer.composeValueNode(Composer.java:317)
	at org.yaml.snakeyaml.composer.Composer.composeMappingChildren(Composer.java:308)
	at org.yaml.snakeyaml.composer.Composer.composeMappingNode(Composer.java:289)
	at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:191)
	at org.yaml.snakeyaml.composer.Composer.getNode(Composer.java:116)
	at org.yaml.snakeyaml.constructor.BaseConstructor.getData(BaseConstructor.java:135)
	at org.yaml.snakeyaml.Yaml$1.next(Yaml.java:514)
	at org.yaml.editor.Snake2Json.yamlToJson(Snake2Json.java:20)
	at org.yaml.editor.Snake2Json.main(Snake2Json.java:27)

js-jsyaml-json

 na
/node/node_modules/js-yaml/lib/loader.js:187
  throw generateError(state, message);
  ^
YAMLException: incomplete explicit mapping pair; a key node is missed; or followed by a non-tabulated empty line (3:1)

 1 | ? &a a
 2 | : &b b
 3 | : *a
-----^
    at generateError (/node/node_modules/js-yaml/lib/loader.js:183:10)
    at throwError (/node/node_modules/js-yaml/lib/loader.js:187:9)
    at readBlockMapping (/node/node_modules/js-yaml/lib/loader.js:1090:9)
    at composeNode (/node/node_modules/js-yaml/lib/loader.js:1441:12)
    at readDocument (/node/node_modules/js-yaml/lib/loader.js:1625:3)
    at loadDocuments (/node/node_modules/js-yaml/lib/loader.js:1688:5)
    at Object.loadAll (/node/node_modules/js-yaml/lib/loader.js:1701:19)
    at Object.<anonymous> (/yaml/bin/js-jsyaml-json:7:13)
    at Module._compile (internal/modules/cjs/loader.js:778:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)

js-yaml-json

 na
{
  "a": "b",
  "": "a"
}

lua-lyaml-json

 na
luajit: 2:3: did not find expected key
stack traceback:
	[C]: in function 'error'
	/usr/local/share/lua/5.1/lyaml/init.lua:306: in function 'error'
	/usr/local/share/lua/5.1/lyaml/init.lua:325: in function 'parse'
	/usr/local/share/lua/5.1/lyaml/init.lua:443: in function 'load_node'
	/usr/local/share/lua/5.1/lyaml/init.lua:340: in function 'load_node'
	/usr/local/share/lua/5.1/lyaml/init.lua:497: in function 'load'
	/yaml/bin/lua-lyaml-json:6: in main chunk
	[C]: at 0x56342c082f97

perl-pp-json

 na
{
   "" : "a",
   "a" : "b"
}

perl-pp-perl

 na
{
  '' => 'a',
  'a' => 'b'
}

perl-pplibyaml-json

 na
YAML::PP::LibYAML Error: The problem:

    did not find expected key

was found at , line: 3, column: 1
while parsing a block mapping at line: 1, column: 1

perl-syck-json

 na
Syck parser (line 3, column 1): syntax error at /perl5/lib/perl5/x86_64-linux-thread-multi/YAML/Syck.pm line 60, <> line 1.

perl-tiny-json

 na
YAML::Tiny does not support a feature in line '? &a a' at /yaml/bin/perl-tiny-json line 12.

perl-xs-json

 na
YAML::XS::Load Error: The problem:

    did not find expected key

was found at document: 1, line: 3, column: 1
while parsing a block mapping at line: 1, column: 1

perl-yaml-json

 na
{
   "" : "a",
   "a" : "b"
}

perl-yaml-perl

 na
{
  '' => 'a',
  'a' => 'b'
}

py-pyyaml-json

 na
Traceback (most recent call last):
  File "/yaml/bin/py-pyyaml-json", line 19, in <module>
    for doc in yaml.load_all(sys.stdin.read(), Loader=yaml.FullLoader):
  File "/python/lib/python3.7/site-packages/yaml/__init__.py", line 93, in load_all
    yield loader.get_data()
  File "/python/lib/python3.7/site-packages/yaml/constructor.py", line 45, in get_data
    return self.construct_document(self.get_node())
  File "/python/lib/python3.7/site-packages/yaml/composer.py", line 27, in get_node
    return self.compose_document()
  File "/python/lib/python3.7/site-packages/yaml/composer.py", line 55, in compose_document
    node = self.compose_node(None, None)
  File "/python/lib/python3.7/site-packages/yaml/composer.py", line 84, in compose_node
    node = self.compose_mapping_node(anchor)
  File "/python/lib/python3.7/site-packages/yaml/composer.py", line 127, in compose_mapping_node
    while not self.check_event(MappingEndEvent):
  File "/python/lib/python3.7/site-packages/yaml/parser.py", line 98, in check_event
    self.current_event = self.state()
  File "/python/lib/python3.7/site-packages/yaml/parser.py", line 439, in parse_block_mapping_key
    "expected <block end>, but found %r" % token.id, token.start_mark)
yaml.parser.ParserError: while parsing a block mapping
  in "<unicode string>", line 1, column 1:
    ? &a a
    ^
expected <block end>, but found ':'
  in "<unicode string>", line 3, column 1:
    : *a
    ^

py-ruamel-json

 na
Error json.dumps: <class 'TypeError'>
Traceback (most recent call last):
  File "/yaml/bin/py-ruamel-json", line 21, in <module>
    print(json.dumps(doc, sort_keys=True, skipkeys=True, indent=2))
  File "/usr/lib/python3.7/json/__init__.py", line 238, in dumps
    **kw).encode(obj)
  File "/usr/lib/python3.7/json/encoder.py", line 201, in encode
    chunks = list(chunks)
  File "/usr/lib/python3.7/json/encoder.py", line 431, in _iterencode
    yield from _iterencode_dict(o, _current_indent_level)
  File "/usr/lib/python3.7/json/encoder.py", line 353, in _iterencode_dict
    items = sorted(dct.items(), key=lambda kv: kv[0])
TypeError: '<' not supported between instances of 'NoneType' and 'str'

py-ruamel-py

 na
{None: 'a', 'a': 'b'}

raku-yamlish-json

 na
Couldn't parse YAML
  in sub load-yamls at /raku/sources/44795C7AB0F35700F4CA9C3E2CC5C924EE4C608F (YAMLish) line 959
  in block <unit> at /yaml/bin/raku-yamlish-json line 6

ruby-psych-json

 na
/ruby/gems/psych/lib/psych.rb:459:in `parse': (<unknown>): did not find expected key while parsing a block mapping at line 1 column 1 (Psych::SyntaxError)
	from /ruby/gems/psych/lib/psych.rb:459:in `parse_stream'
	from /ruby/gems/psych/lib/psych.rb:565:in `load_stream'
	from /yaml/bin/ruby-psych-json:6:in `<main>'

c-libyaml-event

 ni
+STR
+DOC
+MAP
=VAL &a :a
=VAL &b :b
Parse error: did not find expected key

java-snakeyaml-event

 ni
Exception in thread "main" while parsing a block mapping
 in 'reader', line 1, column 1:
    ? &a a
    ^
expected <block end>, but found ':'
 in 'reader', line 3, column 1:
    : *a
    ^

	at org.yaml.snakeyaml.parser.ParserImpl$ParseBlockMappingKey.produce(ParserImpl.java:660)
	at org.yaml.snakeyaml.parser.ParserImpl.peekEvent(ParserImpl.java:166)
	at org.yaml.snakeyaml.Yaml$3.hasNext(Yaml.java:677)
	at org.yaml.editor.Snake2Events.yamlToEvents(Snake2Events.java:134)
	at org.yaml.editor.Snake2Events.main(Snake2Events.java:142)

perl-pplibyaml-perl

 ni
YAML::PP::LibYAML Error: The problem:

    did not find expected key

was found at , line: 3, column: 1
while parsing a block mapping at line: 1, column: 1

perl-tiny-perl

 ni
YAML::Tiny does not support a feature in line '? &a a' at /yaml/bin/perl-tiny-perl line 15.

perl-xs-perl

 ni
YAML::XS::Load Error: The problem:

    did not find expected key

was found at document: 1, line: 3, column: 1
while parsing a block mapping at line: 1, column: 1

py-pyyaml-event

 ni
+STR
+DOC
+MAP
=VAL &a :a
=VAL &b :b
Traceback (most recent call last):
  File "/yaml/bin/py-pyyaml-event", line 7, in <module>
    for event in yaml.parse(sys.stdin.read()):
  File "/python/lib/python3.7/site-packages/yaml/__init__.py", line 46, in parse
    while loader.check_event():
  File "/python/lib/python3.7/site-packages/yaml/parser.py", line 98, in check_event
    self.current_event = self.state()
  File "/python/lib/python3.7/site-packages/yaml/parser.py", line 439, in parse_block_mapping_key
    "expected <block end>, but found %r" % token.id, token.start_mark)
yaml.parser.ParserError: while parsing a block mapping
  in "<unicode string>", line 1, column 1:
    ? &a a
    ^
expected <block end>, but found ':'
  in "<unicode string>", line 3, column 1:
    : *a
    ^

py-pyyaml-py

 ni
Traceback (most recent call last):
  File "/yaml/bin/py-pyyaml-py", line 36, in <module>
    for doc in yaml.load_all(sys.stdin.read(), Loader=yaml.FullLoader):
  File "/python/lib/python3.7/site-packages/yaml/__init__.py", line 93, in load_all
    yield loader.get_data()
  File "/python/lib/python3.7/site-packages/yaml/constructor.py", line 45, in get_data
    return self.construct_document(self.get_node())
  File "/python/lib/python3.7/site-packages/yaml/composer.py", line 27, in get_node
    return self.compose_document()
  File "/python/lib/python3.7/site-packages/yaml/composer.py", line 55, in compose_document
    node = self.compose_node(None, None)
  File "/python/lib/python3.7/site-packages/yaml/composer.py", line 84, in compose_node
    node = self.compose_mapping_node(anchor)
  File "/python/lib/python3.7/site-packages/yaml/composer.py", line 127, in compose_mapping_node
    while not self.check_event(MappingEndEvent):
  File "/python/lib/python3.7/site-packages/yaml/parser.py", line 98, in check_event
    self.current_event = self.state()
  File "/python/lib/python3.7/site-packages/yaml/parser.py", line 439, in parse_block_mapping_key
    "expected <block end>, but found %r" % token.id, token.start_mark)
yaml.parser.ParserError: while parsing a block mapping
  in "<unicode string>", line 1, column 1:
    ? &a a
    ^
expected <block end>, but found ':'
  in "<unicode string>", line 3, column 1:
    : *a
    ^