Fwd: Tabs inside scalars

This was sent to me, but was probably meant for there mailing list:

Begin forwarded message:

From: Ingy dot Net <[email protected]<mailto:[email protected]>>
Subject: Re: [Yaml-core] Tabs inside scalars
Date: 2011-12-17 20:01:59 GMT+01:00
To: Uwe Kubosch <[email protected]<mailto:[email protected]>>

a tab in the middle of a plain scalar should be allowed.

Interestingly, the Perl binding of libyaml handles it fine, while the python version fails:

> perl -MYAML::XS -e 'print Dump Load "x\tx"'
--- "x\tx"

> python -c 'import yaml;print yaml.dump(yaml.load("x\tx"))'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python2.7/dist-packages/yaml/__init__.py", line 71, in load
    return loader.get_single_data()
  File "/usr/lib/python2.7/dist-packages/yaml/constructor.py", line 37, in get_single_data
    node = self.get_single_node()
  File "/usr/lib/python2.7/dist-packages/yaml/composer.py", line 35, in get_single_node
    if not self.check_event(StreamEndEvent):
  File "/usr/lib/python2.7/dist-packages/yaml/parser.py", line 98, in check_event
    self.current_event = self.state()
  File "/usr/lib/python2.7/dist-packages/yaml/parser.py", line 143, in parse_implicit_document_start
    StreamEndToken):
  File "/usr/lib/python2.7/dist-packages/yaml/scanner.py", line 116, in check_token
    self.fetch_more_tokens()
  File "/usr/lib/python2.7/dist-packages/yaml/scanner.py", line 257, in fetch_more_tokens
    % ch.encode('utf-8'), self.get_mark())
yaml.scanner.ScannerError: while scanning for the next token
found character '\t' that cannot start any token
  in "<string>", line 1, column 2:
    x    x
     ^

Kirill?

On Thu, Dec 15, 2011 at 3:09 PM, Uwe Kubosch <[email protected]<mailto:[email protected]>> wrote:
Hi!

I have example output from Ruby 1.8 that fails to parse with SnakeYAML:

"36L\tDIESEL" dumped from Ruby 1.8 gives "--- 36L\tDIESEL\n"

When loaded with SnakeYAML it throws an exception:

Exception in thread "main" while scanning for the next token
found character         '\t' that cannot start any token
 in "<string>", line 1, column 8:
   --- 36L     DIESEL
          ^

       at org.yaml.snakeyaml.scanner.ScannerImpl.fetchMoreTokens(ScannerImpl.java:358)
       at org.yaml.snakeyaml.scanner.ScannerImpl.peekToken(ScannerImpl.java:202)
       at org.yaml.snakeyaml.parser.ParserImpl$ParseDocumentEnd.produce(ParserImpl.java:265)
       at org.yaml.snakeyaml.parser.ParserImpl.peekEvent(ParserImpl.java:161)
       at org.yaml.snakeyaml.parser.ParserImpl.getEvent(ParserImpl.java:171)
       at org.yaml.snakeyaml.composer.Composer.composeDocument(Composer.java:125)
       at org.yaml.snakeyaml.composer.Composer.getSingleNode(Composer.java:106)
       at org.yaml.snakeyaml.constructor.BaseConstructor.getSingleData(BaseConstructor.java:121)
       at org.yaml.snakeyaml.Yaml.loadFromReader(Yaml.java:296)
       at org.yaml.snakeyaml.Yaml.load(Yaml.java:266)
       at
Issue136.main(Issue136.java:5)

This is currently being tracked at http://code.google.com/p/snakeyaml/issues/detail?id=136

The question is wether the example is legal YAML.

I have read the specs, and I find them inconclusive.  Ruby 1.8 has been around for a long while, and the use of YAML with Ruby is widespread, being in the standard library and all.  So I assumed that the output is legal YAML and that SnakeYAML should accept it.

Anybody got an answer on this?

--
Uwe Kubosch
Systems Developer
Datek Wireless AS
[email protected]<mailto:[email protected]>
http://datek.no/



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--
Uwe Kubosch
Systems Developer
Datek Wireless AS
[email protected]<mailto:[email protected]>
http://datek.no/

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