# YAML Test Matrix

--- &test-SM9W:01
  Title: Single character streams
  Tags: [ mapping ]

YAML

:

Expected Events

+STR
+DOC
+MAP
=VAL :
=VAL :
-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   



 
             


c-libyaml-event

 error 
+STR
+DOC
+MAP
Parse error: did not find expected key


 



  


perl-pplibyaml-perl

 error 
YAML::PP::LibYAML Error: The problem:

    did not find expected key

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


 



  


perl-tiny-perl

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


 



  


perl-xs-perl

 error 
YAML::XS::Load Error: The problem:

    did not find expected key

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


 



  


py-pyyaml-event

 error 
+STR
+DOC
+MAP
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/python3.12/site-packages/yaml/__init__.py", line 75, in parse
    while loader.check_event():
          ^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/parser.py", line 98, in check_event
    self.current_event = self.state()
                         ^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/parser.py", line 425, in parse_block_mapping_first_key
    return self.parse_block_mapping_key()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/parser.py", line 438, in parse_block_mapping_key
    raise ParserError("while parsing a block mapping", self.marks[-1],
yaml.parser.ParserError: while parsing a block mapping
expected <block end>, but found ':'
  in "<unicode string>", line 1, column 1:
    :
    ^


 



  


py-pyyaml-py

 error 
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/python3.12/site-packages/yaml/__init__.py", line 130, in load_all
    yield loader.get_data()
          ^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/constructor.py", line 45, in get_data
    return self.construct_document(self.get_node())
                                   ^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/composer.py", line 27, in get_node
    return self.compose_document()
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/composer.py", line 55, in compose_document
    node = self.compose_node(None, None)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/composer.py", line 84, in compose_node
    node = self.compose_mapping_node(anchor)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/composer.py", line 127, in compose_mapping_node
    while not self.check_event(MappingEndEvent):
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/parser.py", line 98, in check_event
    self.current_event = self.state()
                         ^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/parser.py", line 425, in parse_block_mapping_first_key
    return self.parse_block_mapping_key()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/parser.py", line 438, in parse_block_mapping_key
    raise ParserError("while parsing a block mapping", self.marks[-1],
yaml.parser.ParserError: while parsing a block mapping
expected <block end>, but found ':'
  in "<unicode string>", line 1, column 1:
    :
    ^


 



 
    


c-libfyaml-json

 na  
{
  "": null
}



 



  


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: did not find expected key



 



  


hs-hsyaml-json

 na  
{"":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 +PAIR|
   1    0    0    0 +NODE|
   1    0    0    0 +VAL |
   1    0    0    0 -VAL |
   1    0    0    0 -NODE|
   1    0    0    0 =SYNX|:
   1    1    1    1 +NODE|
   1    1    1    1 +VAL |
   1    1    1    1 -VAL |
   1    1    1    1 -NODE|
   1    1    1    1 -PAIR|
   1    1    1    1 -MAP |
   1    1    1    1 -NODE|
   1    1    1    1 -DOC |



 



  


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 (1:1)

 1 | :
-----^
    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 (node:internal/modules/cjs/loader:1358:14)
    at Module._extensions..js (node:internal/modules/cjs/loader:1416:10) {
  reason: 'incomplete explicit mapping pair; a key node is missed; or followed by a non-tabulated empty line',
  mark: {
    name: null,
    buffer: ':\n',
    position: 0,
    line: 0,
    column: 0,
    snippet: ' 1 | :\n-----^'
  }
}

Node.js v20.13.1



 



  


js-yaml-json

 na  
{
  "": null
}



 



  


lua-lyaml-json

 na  
luajit: 1:1: 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 0x556236aeded0



 



  


perl-pp-json

 na  
{
   "" : null
}



 



  


perl-pp-perl

 na  
{
  '' => undef
}



 



  


perl-pplibyaml-json

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

    did not find expected key

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



 



  


perl-syck-json

 na  
":"



 



  


perl-syck-perl

 na  
':'



 



  


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:

    did not find expected key

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



 



  


perl-yaml-json

 na  
{
   "" : null
}



 



  


perl-yaml-perl

 na  
{
  '' => undef
}



 



  


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/python3.12/site-packages/yaml/__init__.py", line 130, in load_all
    yield loader.get_data()
          ^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/constructor.py", line 45, in get_data
    return self.construct_document(self.get_node())
                                   ^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/composer.py", line 27, in get_node
    return self.compose_document()
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/composer.py", line 55, in compose_document
    node = self.compose_node(None, None)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/composer.py", line 84, in compose_node
    node = self.compose_mapping_node(anchor)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/composer.py", line 127, in compose_mapping_node
    while not self.check_event(MappingEndEvent):
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/parser.py", line 98, in check_event
    self.current_event = self.state()
                         ^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/parser.py", line 425, in parse_block_mapping_first_key
    return self.parse_block_mapping_key()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/parser.py", line 438, in parse_block_mapping_key
    raise ParserError("while parsing a block mapping", self.marks[-1],
yaml.parser.ParserError: while parsing a block mapping
expected <block end>, but found ':'
  in "<unicode string>", line 1, column 1:
    :
    ^



 



  


py-ruamel-json

 na  
{
  "null": null
}



 



  


py-ruamel-py

 na  
{None: None}



 



  


ruby-psych-json

 na  
/ruby/gems/psych/lib/psych.rb:458: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:458:in `parse_stream'
	from /ruby/gems/psych/lib/psych.rb:632:in `load_stream'
	from /yaml/bin/ruby-psych-json:6:in `<main>'