# YAML Test Matrix

--- &test-FRK4
  Title: Spec Example 7.3. Completely Empty Flow Nodes
  Tags: [ empty-key, explicit-key, flow, mapping, spec ]

YAML

{
  ? foo :,
  : bar,
}

Expected Events

+STR
+DOC
+MAP {}
=VAL :foo
=VAL :
=VAL :
=VAL :bar
-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   



  


rust-yamlrust-event

 ok   



 
       


py-ruamel-event

 diff 


  Got Events:

+STR
+DOC
+MAP {}
=VAL :foo :
=VAL :
=VAL :
=VAL :bar
-MAP
-DOC
-STR



 



 
       


java-snakeengine-event

 error 
Exception in thread "main" while parsing a flow node
 in reader, line 3, column 3:
      : bar,
      ^
expected the node content, but found ':'
 in reader, line 3, column 3:
      : bar,
      ^

	at org.snakeyaml.engine.v2.parser.ParserImpl.parseNode(ParserImpl.java:548)
	at org.snakeyaml.engine.v2.parser.ParserImpl.parseFlowNode(ParserImpl.java:436)
	at org.snakeyaml.engine.v2.parser.ParserImpl.access$2700(ParserImpl.java:130)
	at org.snakeyaml.engine.v2.parser.ParserImpl$ParseFlowMappingKey.produce(ParserImpl.java:940)
	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 3): syntax error at /perl5/lib/perl5/x86_64-linux-thread-multi/YAML/Syck.pm line 60, <> line 1.


 



  


perl-yaml-perl

 error 
YAML Error: Expected separator '---'
   Code: YAML_PARSE_ERR_NO_SEPARATOR
   Line: 1
   Document: 2
 at /perl5/lib/perl5/YAML/Loader.pm line 88.


 



  


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  
{
  "foo": null,
  "": "bar"
}



 



  


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 node content



 



  


hs-hsyaml-json

 na  
{"":"bar","foo":null}



 



  


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 =SYNX|{
   1    1    1    1 =EOL |\x0a
   2    0    2    2 =WSPC|..
   2    2    4    4 +PAIR|
   2    2    4    4 =SYNX|?
   2    3    5    5 =WSPC|.
   2    4    6    6 +NODE|
   2    4    6    6 +VAL |
   2    4    6    6 =TEXT|foo.:
   2    9   11   11 -VAL |
   2    9   11   11 -NODE|
   2    9   11   11 +NODE|
   2    9   11   11 +VAL |
   2    9   11   11 -VAL |
   2    9   11   11 -NODE|
   2    9   11   11 -PAIR|
   2    9   11   11 =SYNX|,
   2   10   12   12 =EOL |\x0a
   3    0   13   13 =WSPC|..
   3    2   15   15 +PAIR|
   3    2   15   15 +NODE|
   3    2   15   15 +VAL |
   3    2   15   15 -VAL |
   3    2   15   15 -NODE|
   3    2   15   15 =SYNX|:
   3    3   16   16 =WSPC|.
   3    4   17   17 +NODE|
   3    4   17   17 +VAL |
   3    4   17   17 =TEXT|bar
   3    7   20   20 -VAL |
   3    7   20   20 -NODE|
   3    7   20   20 -PAIR|
   3    7   20   20 =SYNX|,
   3    8   21   21 =EOL |\x0a
   4    0   22   22 =SYNX|}
   4    1   23   23 -MAP |
   4    1   23   23 -NODE|
   4    1   23   23 =EOL |\x0a
   5    0   24   24 -DOC |



 



  


java-snakeengine-json

 na  
Exception in thread "main" while parsing a flow node
 in 'reader', line 3, column 3:
      : bar,
      ^
expected the node content, but found ':'
 in 'reader', line 3, column 3:
      : bar,
      ^

	at org.yaml.snakeyaml.parser.ParserImpl.parseNode(ParserImpl.java:526)
	at org.yaml.snakeyaml.parser.ParserImpl.parseFlowNode(ParserImpl.java:414)
	at org.yaml.snakeyaml.parser.ParserImpl.access$2400(ParserImpl.java:121)
	at org.yaml.snakeyaml.parser.ParserImpl$ParseFlowMappingKey.produce(ParserImpl.java:906)
	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 flow node
 in 'reader', line 3, column 3:
      : bar,
      ^
expected the node content, but found ':'
 in 'reader', line 3, column 3:
      : bar,
      ^

	at org.yaml.snakeyaml.parser.ParserImpl.parseNode(ParserImpl.java:526)
	at org.yaml.snakeyaml.parser.ParserImpl.parseFlowNode(ParserImpl.java:414)
	at org.yaml.snakeyaml.parser.ParserImpl.access$2400(ParserImpl.java:121)
	at org.yaml.snakeyaml.parser.ParserImpl$ParseFlowMappingKey.produce(ParserImpl.java:906)
	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  
{"foo":null,"null":"bar"}



 



  


js-yaml-json

 na  
{
  "foo": null,
  "": "bar"
}



 



  


lua-lyaml-json

 na  
luajit: 1:1: found unexpected ':'
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 0x5577498bff97



 



  


perl-pp-json

 na  
{
   "" : "bar",
   "foo" : null
}



 



  


perl-pp-perl

 na  
{
  '' => 'bar',
  'foo' => undef
}



 



  


perl-pplibyaml-json

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

    found unexpected ':'

was found at , line: 2, column: 9
while scanning a plain scalar at line: 2, column: 5



 



  


perl-syck-json

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



 



  


perl-tiny-json

 na  
YAML::Tiny failed to classify line '{' at /yaml/bin/perl-tiny-json line 12.



 



  


perl-xs-json

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

    found unexpected ':'

was found at document: 1, line: 2, column: 9
while scanning a plain scalar at line: 2, column: 5



 



  


perl-yaml-json

 na  
YAML Error: Expected separator '---'
   Code: YAML_PARSE_ERR_NO_SEPARATOR
   Line: 1
   Document: 2
 at /perl5/lib/perl5/YAML/Loader.pm line 88.



 



  


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 562, in parse_flow_mapping_key
    return self.parse_flow_node()
  File "/python/lib/python3.7/site-packages/yaml/parser.py", line 268, in parse_flow_node
    return self.parse_node()
  File "/python/lib/python3.7/site-packages/yaml/parser.py", line 371, in parse_node
    token.start_mark)
yaml.parser.ParserError: while parsing a flow node
expected the node content, but found ':'
  in "<unicode string>", line 3, column 3:
      : bar,
      ^



 



  


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: 'bar', 'foo :': None}



 



  


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>): found unexpected ':' while scanning a plain scalar at line 2 column 5 (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 {}
Parse error: found unexpected ':'


 



  


java-snakeyaml-event

 ni 
Exception in thread "main" while parsing a flow node
 in 'reader', line 3, column 3:
      : bar,
      ^
expected the node content, but found ':'
 in 'reader', line 3, column 3:
      : bar,
      ^

	at org.yaml.snakeyaml.parser.ParserImpl.parseNode(ParserImpl.java:526)
	at org.yaml.snakeyaml.parser.ParserImpl.parseFlowNode(ParserImpl.java:414)
	at org.yaml.snakeyaml.parser.ParserImpl.access$2400(ParserImpl.java:121)
	at org.yaml.snakeyaml.parser.ParserImpl$ParseFlowMappingKey.produce(ParserImpl.java:906)
	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:

    found unexpected ':'

was found at , line: 2, column: 9
while scanning a plain scalar at line: 2, column: 5


 



  


perl-tiny-perl

 ni 
YAML::Tiny failed to classify line '{' at /yaml/bin/perl-tiny-perl line 15.


 



  


perl-xs-perl

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

    found unexpected ':'

was found at document: 1, line: 2, column: 9
while scanning a plain scalar at line: 2, column: 5


 



  


py-pyyaml-event

 ni 
+STR
+DOC
+MAP {}
=VAL :foo
=VAL :
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 562, in parse_flow_mapping_key
    return self.parse_flow_node()
  File "/python/lib/python3.7/site-packages/yaml/parser.py", line 268, in parse_flow_node
    return self.parse_node()
  File "/python/lib/python3.7/site-packages/yaml/parser.py", line 371, in parse_node
    token.start_mark)
yaml.parser.ParserError: while parsing a flow node
expected the node content, but found ':'
  in "<unicode string>", line 3, column 3:
      : bar,
      ^


 



  


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 562, in parse_flow_mapping_key
    return self.parse_flow_node()
  File "/python/lib/python3.7/site-packages/yaml/parser.py", line 268, in parse_flow_node
    return self.parse_node()
  File "/python/lib/python3.7/site-packages/yaml/parser.py", line 371, in parse_node
    token.start_mark)
yaml.parser.ParserError: while parsing a flow node
expected the node content, but found ':'
  in "<unicode string>", line 3, column 3:
      : bar,
      ^