# YAML Test Matrix

--- &test-A2M4
  Title: Spec Example 6.2. Indentation Indicators
  Tags: [ explicit-key, indent, libyaml-err, sequence, spec, upto-1.2, whitespace ]

YAML

? a
: -	b
  -  -	c
     - d

Expected Events

+STR
+DOC
+MAP
=VAL :a
+SEQ
=VAL :b
+SEQ
=VAL :c
=VAL :d
-SEQ
-SEQ
-MAP
-DOC
-STR

Expected JSON

{
"a": [
"b",
[
"c",
"d"
]
]
}

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

c-libfyaml-json

 json_ok

dotnet-yamldotnet-json

 json_ok

hs-hsyaml-json

 json_ok

js-jsyaml-json

 json_ok

js-yaml-json

 json_ok

perl-pp-json

 json_ok

rust-yamlrust-event

 diff
Minimal Events:
+STR
+DOC
+MAP
=VAL :a
+SEQ
=VAL :b
+SEQ
=VAL :c
=VAL :d
-SEQ
-SEQ
-MAP
-DOC
-STR
Transformed Events:
+STR
+DOC
+MAP
=VAL :a
+SEQ
=VAL :\tb
+SEQ
=VAL :\tc
=VAL :d
-SEQ
-SEQ
-MAP
-DOC
-STR
Got Events:
+STR
+DOC
+MAP
=VAL :a
+SEQ
=VAL :\tb
+SEQ
=VAL :\tc
=VAL :d
-SEQ
-SEQ
-MAP
-DOC
-STR

perl-syck-json

 json_diff
{
  "a": "-\tb -  -\tc - d"
}

c-libyaml-event

 error
+STR
+DOC
+MAP
=VAL :a
+SEQ
Parse error: found character that cannot start any token

go-yaml-json

 error
yaml: line 2: found character that cannot start any token

lua-lyaml-json

 error
luajit: 2:3: found character that cannot start any token
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:393: in function 'load_node'
	/usr/local/share/lua/5.1/lyaml/init.lua:378: 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 0x5639f8ff1ed0

perl-pplibyaml-json

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

    found character that cannot start any token

was found at , line: 2, column: 4
while scanning for the next token at line: 2, column: 4

perl-pplibyaml-perl

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

    found character that cannot start any token

was found at , line: 2, column: 4
while scanning for the next token at line: 2, column: 4

perl-xs-json

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

    found character that cannot start any token

was found at document: 1, line: 2, column: 4
while scanning for the next token at line: 2, column: 4

perl-xs-perl

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

    found character that cannot start any token

was found at document: 1, line: 2, column: 4
while scanning for the next token at line: 2, column: 4

perl-yaml-json

 error
YAML Error: Inconsistent indentation level
   Code: YAML_PARSE_ERR_INCONSISTENT_INDENTATION
   Line: 3
   Document: 1
 at /perl5/lib/perl5/YAML/Loader.pm line 804.

perl-yaml-perl

 error
YAML Error: Inconsistent indentation level
   Code: YAML_PARSE_ERR_INCONSISTENT_INDENTATION
   Line: 3
   Document: 1
 at /perl5/lib/perl5/YAML/Loader.pm line 804.

py-pyyaml-event

 error
+STR
+DOC
+MAP
=VAL :a
+SEQ
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 379, in parse_block_sequence_first_entry
    return self.parse_block_sequence_entry()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/parser.py", line 384, in parse_block_sequence_entry
    if not self.check_token(BlockEntryToken, BlockEndToken):
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/scanner.py", line 116, in check_token
    self.fetch_more_tokens()
  File "/python/lib/python3.12/site-packages/yaml/scanner.py", line 258, in fetch_more_tokens
    raise ScannerError("while scanning for the next token", None,
yaml.scanner.ScannerError: while scanning for the next token
found character '\t' that cannot start any token
  in "<unicode string>", line 2, column 4:
    : -	b
       ^

py-pyyaml-json

 error
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 133, in compose_mapping_node
    item_value = self.compose_node(node, item_key)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/composer.py", line 82, in compose_node
    node = self.compose_sequence_node(anchor)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/composer.py", line 110, in compose_sequence_node
    while not self.check_event(SequenceEndEvent):
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  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 379, in parse_block_sequence_first_entry
    return self.parse_block_sequence_entry()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/parser.py", line 384, in parse_block_sequence_entry
    if not self.check_token(BlockEntryToken, BlockEndToken):
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/scanner.py", line 116, in check_token
    self.fetch_more_tokens()
  File "/python/lib/python3.12/site-packages/yaml/scanner.py", line 258, in fetch_more_tokens
    raise ScannerError("while scanning for the next token", None,
yaml.scanner.ScannerError: while scanning for the next token
found character '\t' that cannot start any token
  in "<unicode string>", line 2, column 4:
    : -	b
       ^

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 133, in compose_mapping_node
    item_value = self.compose_node(node, item_key)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/composer.py", line 82, in compose_node
    node = self.compose_sequence_node(anchor)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/composer.py", line 110, in compose_sequence_node
    while not self.check_event(SequenceEndEvent):
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  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 379, in parse_block_sequence_first_entry
    return self.parse_block_sequence_entry()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/parser.py", line 384, in parse_block_sequence_entry
    if not self.check_token(BlockEntryToken, BlockEndToken):
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/yaml/scanner.py", line 116, in check_token
    self.fetch_more_tokens()
  File "/python/lib/python3.12/site-packages/yaml/scanner.py", line 258, in fetch_more_tokens
    raise ScannerError("while scanning for the next token", None,
yaml.scanner.ScannerError: while scanning for the next token
found character '\t' that cannot start any token
  in "<unicode string>", line 2, column 4:
    : -	b
       ^

py-ruamel-event

 error
+STR
+DOC
+MAP
=VAL :a
+SEQ
Traceback (most recent call last):
  File "/yaml/bin/py-ruamel-event", line 9, in <module>
    for event in yaml.parse(sys.stdin.read()):
  File "/python/lib/python3.12/site-packages/ruamel/yaml/main.py", line 371, in parse
    while parser.check_event():
          ^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/parser.py", line 141, in check_event
    self.current_event = self.state()
                         ^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/parser.py", line 532, in parse_block_sequence_first_entry
    return self.parse_block_sequence_entry()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/parser.py", line 538, in parse_block_sequence_entry
    if not self.scanner.check_token(BlockEntryToken, BlockEndToken):
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/scanner.py", line 170, in check_token
    self.fetch_more_tokens()
  File "/python/lib/python3.12/site-packages/ruamel/yaml/scanner.py", line 313, in fetch_more_tokens
    raise ScannerError(
ruamel.yaml.scanner.ScannerError: while scanning for the next token
found character '\t' that cannot start any token
  in "<unicode string>", line 2, column 4:
    : -	b
       ^ (line: 2)

py-ruamel-json

 error
Traceback (most recent call last):
  File "/yaml/bin/py-ruamel-json", line 21, in <module>
    for doc in yaml.load_all(sys.stdin.read()):
  File "/python/lib/python3.12/site-packages/ruamel/yaml/main.py", line 476, in load_all
    yield constructor.get_data()
          ^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/constructor.py", line 110, in get_data
    return self.construct_document(self.composer.get_node())
                                   ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/composer.py", line 63, in get_node
    return self.compose_document()
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/composer.py", line 94, in compose_document
    node = self.compose_node(None, None)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/composer.py", line 130, in compose_node
    node = self.compose_mapping_node(anchor)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/composer.py", line 211, in compose_mapping_node
    item_value = self.compose_node(node, item_key)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/composer.py", line 128, in compose_node
    node = self.compose_sequence_node(anchor)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/composer.py", line 172, in compose_sequence_node
    while not self.parser.check_event(SequenceEndEvent):
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/parser.py", line 141, in check_event
    self.current_event = self.state()
                         ^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/parser.py", line 532, in parse_block_sequence_first_entry
    return self.parse_block_sequence_entry()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/parser.py", line 538, in parse_block_sequence_entry
    if not self.scanner.check_token(BlockEntryToken, BlockEndToken):
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/scanner.py", line 170, in check_token
    self.fetch_more_tokens()
  File "/python/lib/python3.12/site-packages/ruamel/yaml/scanner.py", line 313, in fetch_more_tokens
    raise ScannerError(
ruamel.yaml.scanner.ScannerError: while scanning for the next token
found character '\t' that cannot start any token
  in "<unicode string>", line 2, column 4:
    : -	b
       ^ (line: 2)

py-ruamel-py

 error
Traceback (most recent call last):
  File "/yaml/bin/py-ruamel-py", line 38, in <module>
    for doc in yaml.load_all(sys.stdin.read()):
  File "/python/lib/python3.12/site-packages/ruamel/yaml/main.py", line 476, in load_all
    yield constructor.get_data()
          ^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/constructor.py", line 110, in get_data
    return self.construct_document(self.composer.get_node())
                                   ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/composer.py", line 63, in get_node
    return self.compose_document()
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/composer.py", line 94, in compose_document
    node = self.compose_node(None, None)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/composer.py", line 130, in compose_node
    node = self.compose_mapping_node(anchor)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/composer.py", line 211, in compose_mapping_node
    item_value = self.compose_node(node, item_key)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/composer.py", line 128, in compose_node
    node = self.compose_sequence_node(anchor)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/composer.py", line 172, in compose_sequence_node
    while not self.parser.check_event(SequenceEndEvent):
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/parser.py", line 141, in check_event
    self.current_event = self.state()
                         ^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/parser.py", line 532, in parse_block_sequence_first_entry
    return self.parse_block_sequence_entry()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/parser.py", line 538, in parse_block_sequence_entry
    if not self.scanner.check_token(BlockEntryToken, BlockEndToken):
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/python/lib/python3.12/site-packages/ruamel/yaml/scanner.py", line 170, in check_token
    self.fetch_more_tokens()
  File "/python/lib/python3.12/site-packages/ruamel/yaml/scanner.py", line 313, in fetch_more_tokens
    raise ScannerError(
ruamel.yaml.scanner.ScannerError: while scanning for the next token
found character '\t' that cannot start any token
  in "<unicode string>", line 2, column 4:
    : -	b
       ^ (line: 2)

ruby-psych-json

 error
/ruby/gems/psych/lib/psych.rb:458:in `parse': (<unknown>): found character that cannot start any token while scanning for the next token at line 2 column 4 (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>'

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 +VAL |
   1    2    2    2 =TEXT|a
   1    3    3    3 -VAL |
   1    3    3    3 -NODE|
   1    3    3    3 =EOL |\x0a
   2    0    4    4 =SYNX|:
   2    1    5    5 =DENT|.
   2    2    6    6 +NODE|
   2    2    6    6 +SEQ |
   2    2    6    6 =SYNX|-
   2    3    7    7 =WSPC|\x09
   2    4    8    8 +NODE|
   2    4    8    8 +VAL |
   2    4    8    8 =TEXT|b
   2    5    9    9 -VAL |
   2    5    9    9 -NODE|
   2    5    9    9 =EOL |\x0a
   3    0   10   10 =DENT|..
   3    2   12   12 =SYNX|-
   3    3   13   13 =DENT|..
   3    5   15   15 +NODE|
   3    5   15   15 +SEQ |
   3    5   15   15 =SYNX|-
   3    6   16   16 =WSPC|\x09
   3    7   17   17 +NODE|
   3    7   17   17 +VAL |
   3    7   17   17 =TEXT|c
   3    8   18   18 -VAL |
   3    8   18   18 -NODE|
   3    8   18   18 =EOL |\x0a
   4    0   19   19 =DENT|.....
   4    5   24   24 =SYNX|-
   4    6   25   25 =WSPC|.
   4    7   26   26 +NODE|
   4    7   26   26 +VAL |
   4    7   26   26 =TEXT|d
   4    8   27   27 -VAL |
   4    8   27   27 -NODE|
   4    8   27   27 =EOL |\x0a
   5    0   28   28 -SEQ |
   5    0   28   28 -NODE|
   5    0   28   28 -SEQ |
   5    0   28   28 -NODE|
   5    0   28   28 -PAIR|
   5    0   28   28 -MAP |
   5    0   28   28 -NODE|
   5    0   28   28 -DOC |

perl-pp-perl

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

perl-syck-perl

 na
{
  'a' => '-	b -  -	c - d'
}

perl-tiny-json

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

perl-tiny-perl

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