# YAML Test Matrix

--- &test-6BFJ
  Title: Mapping, key and flow sequence item anchors
  Tags: [ anchor, complex-key, flow, mapping, sequence ]

YAML

---
&mapping
&key [ &item a, b, c ]: value

Expected Events

+STR
+DOC ---
+MAP &mapping
+SEQ [] &key
=VAL &item :a
=VAL :b
=VAL :c
-SEQ
=VAL :value
-MAP
-DOC
-STR

Expected JSON






   


c-libfyaml-event

 ok   



  


c-libyaml-event

 ok   



  


cpp-yamlcpp-event

 ok   



  


dotnet-yamldotnet-event

 ok   



  


hs-hsyaml-event

 ok   



  


js-yaml-event

 ok   



  


nim-nimyaml-event

 ok   



  


perl-refparser-event

 ok   



  


py-pyyaml-event

 ok   



  


py-ruamel-event

 ok   



  


rust-yamlrust-event

 ok   



 
             


cpp-rapidyaml-event

 error 
-:3:6: (18B): ERROR: triple-pending anchor
-:3:6: &key [ &item a, b, c ]: value  (size=29)
            ^~~~~~~~~~~~~~~~~~~~~~~~  (cols 6-30)


 



  


perl-pp-event

 error 
+STR
+DOC ---
+SEQ [] &key
Line      : 3
Column    : 16
Message   : A node can only have one anchor
Where     : /perl5/lib/perl5/YAML/PP/Parser.pm line 704
YAML      : " b, c ]: value\n"
  at /yaml/bin/perl-pp-event line 46.


 



  


perl-pp-perl

 error 
Line      : 3
Column    : 16
Message   : A node can only have one anchor
Where     : /perl5/lib/perl5/YAML/PP/Parser.pm line 704
YAML      : " b, c ]: value\n"
  at /perl5/lib/perl5/YAML/PP/Loader.pm line 94.


 



  


perl-syck-perl

 error 
Syck parser (line 3, column 6): 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: 2
   Document: 2
 at /perl5/lib/perl5/YAML/Loader.pm line 88.


 



  


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/constructor.py", line 60, in construct_document
    for dummy in generator:
  File "/python/lib/python3.12/site-packages/yaml/constructor.py", line 413, in construct_yaml_map
    value = self.construct_mapping(node)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/constructor.py", line 218, in construct_mapping
    return super().construct_mapping(node, deep=deep)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/constructor.py", line 141, in construct_mapping
    raise ConstructorError("while constructing a mapping", node.start_mark,
yaml.constructor.ConstructorError: while constructing a mapping
  in "<unicode string>", line 2, column 1:
    &mapping
    ^
found unhashable key
  in "<unicode string>", line 3, column 1:
    &key [ &item a, b, c ]: value
    ^


 



 
    


c-libfyaml-json

 na  
{
stdin:3:6: error: Non scalar keys are not allowed in JSON emit mode
&key [ &item a, b, c ]: value
     ^~~~~~~~~~~~~~~~~



 



  


dotnet-yamldotnet-json

 na  
{? ["a", "b", "c"] : "value"}



 



  


go-yaml-json

 na  
yaml: invalid map key: []interface {}{"a", "b", "c"}



 



  


hs-hsyaml-json

 na  
{"[\"a\",\"b\",\"c\"]":"value"}



 



  


hs-reference-yeast

 na  
Line  Col Char Byte Token|Content
   1    0    0    0 +DOC |
   1    0    0    0 =HEAD|---
   1    3    3    3 +NODE|
   1    3    3    3 =EOL |\x0a
   2    0    4    4 +PROP|
   2    0    4    4 +ANCH|
   2    0    4    4 =SYNX|&
   2    1    5    5 =META|mapping
   2    8   12   12 -ANCH|
   2    8   12   12 -PROP|
   2    8   12   12 =EOL |\x0a
   3    0   13   13 +MAP |
   3    0   13   13 +PAIR|
   3    0   13   13 +NODE|
   3    0   13   13 +PROP|
   3    0   13   13 +ANCH|
   3    0   13   13 =SYNX|&
   3    1   14   14 =META|key
   3    4   17   17 -ANCH|
   3    4   17   17 -PROP|
   3    4   17   17 =WSPC|.
   3    5   18   18 +SEQ |
   3    5   18   18 =SYNX|[
   3    6   19   19 =WSPC|.
   3    7   20   20 +NODE|
   3    7   20   20 +PROP|
   3    7   20   20 +ANCH|
   3    7   20   20 =SYNX|&
   3    8   21   21 =META|item
   3   12   25   25 -ANCH|
   3   12   25   25 -PROP|
   3   12   25   25 =WSPC|.
   3   13   26   26 +VAL |
   3   13   26   26 =TEXT|a
   3   14   27   27 -VAL |
   3   14   27   27 -NODE|
   3   14   27   27 =SYNX|,
   3   15   28   28 =WSPC|.
   3   16   29   29 +NODE|
   3   16   29   29 +VAL |
   3   16   29   29 =TEXT|b
   3   17   30   30 -VAL |
   3   17   30   30 -NODE|
   3   17   30   30 =SYNX|,
   3   18   31   31 =WSPC|.
   3   19   32   32 +NODE|
   3   19   32   32 +VAL |
   3   19   32   32 =TEXT|c
   3   20   33   33 -VAL |
   3   20   33   33 -NODE|
   3   20   33   33 =WSPC|.
   3   21   34   34 =SYNX|]
   3   22   35   35 -SEQ |
   3   22   35   35 -NODE|
   3   22   35   35 =SYNX|:
   3   23   36   36 =WSPC|.
   3   24   37   37 +NODE|
   3   24   37   37 +VAL |
   3   24   37   37 =TEXT|value
   3   29   42   42 -VAL |
   3   29   42   42 -NODE|
   3   29   42   42 =EOL |\x0a
   4    0   43   43 -PAIR|
   4    0   43   43 -MAP |
   4    0   43   43 -NODE|
   4    0   43   43 -DOC |



 



  


js-jsyaml-json

 na  
/node/node_modules/js-yaml/lib/loader.js:187
  throw generateError(state, message);
  ^
YAMLException: duplication of an anchor property (3:1)

 1 | ---
 2 | &mapping
 3 | &key [ &item a, b, c ]: value
-----^
    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 readAnchorProperty (/node/node_modules/js-yaml/lib/loader.js:1317:5)
    at composeNode (/node/node_modules/js-yaml/lib/loader.js:1407:38)
    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: 'duplication of an anchor property',
  mark: {
    name: null,
    buffer: '---\n&mapping\n&key [ &item a, b, c ]: value\n',
    position: 13,
    line: 2,
    column: 0,
    snippet: ' 1 | ---\n 2 | &mapping\n 3 | &key [ &item a, b, c ]: value\n-----^'
  }
}

Node.js v20.13.1



 



  


js-yaml-json

 na  
{
  "[ &item a, b, c ]": "value"
}
(node:765) Warning: Keys with collection values will be stringified due to JS Object restrictions: "[ &item a, b, c ]". Set mapAsMap: true to use object keys.
(Use `node --trace-warnings ...` to show where the warning was created)



 



  


lua-lyaml-json

 na  
luajit: /yaml/bin/lua-lyaml-json:8: Cannot serialise table: table key must be a number or string
stack traceback:
	[C]: in function 'encode'
	/yaml/bin/lua-lyaml-json:8: in main chunk
	[C]: at 0x55be17d4aed0



 



  


perl-pp-json

 na  
Line      : 3
Column    : 16
Message   : A node can only have one anchor
Where     : /perl5/lib/perl5/YAML/PP/Parser.pm line 704
YAML      : " b, c ]: value\n"
  at /perl5/lib/perl5/YAML/PP/Loader.pm line 94.



 



  


perl-pplibyaml-json

 na  
{
   "['a','b','c']" : "value"
}



 



  


perl-pplibyaml-perl

 na  
{
  '[\'a\',\'b\',\'c\']' => 'value'
}



 



  


perl-syck-json

 na  
Syck parser (line 3, column 6): 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 '&mapping' at /yaml/bin/perl-tiny-json line 12.



 



  


perl-xs-json

 na  
{
   "ARRAY(0x7f09d2f5f8e0)" : "value"
}



 



  


perl-xs-perl

 na  
{
  'ARRAY(0x7f4f426e9608)' => 'value'
}



 



  


perl-yaml-json

 na  
YAML Error: Expected separator '---'
   Code: YAML_PARSE_ERR_NO_SEPARATOR
   Line: 2
   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/python3.12/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/constructor.py", line 60, in construct_document
    for dummy in generator:
  File "/python/lib/python3.12/site-packages/yaml/constructor.py", line 413, in construct_yaml_map
    value = self.construct_mapping(node)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/constructor.py", line 218, in construct_mapping
    return super().construct_mapping(node, deep=deep)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/constructor.py", line 141, in construct_mapping
    raise ConstructorError("while constructing a mapping", node.start_mark,
yaml.constructor.ConstructorError: while constructing a mapping
  in "<unicode string>", line 2, column 1:
    &mapping
    ^
found unhashable key
  in "<unicode string>", line 3, column 1:
    &key [ &item a, b, c ]: value
    ^



 



  


py-ruamel-json

 na  
{
  
}



 



  


py-ruamel-py

 na  
{('a', 'b', 'c'): 'value'}



 



  


ruby-psych-json

 na  
{"[\"a\", \"b\", \"c\"]":"value"}



 



 
    


perl-tiny-perl

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