Re: Tabs inside scalars

When should I expect a decision on this?


On 2011-12-19, at 18:33, Ingy dot Net wrote:

> Yes, sorry about that. Kirill is likely the person who can answer most definitively.
> 
> On Mon, Dec 19, 2011 at 12:59 AM, Uwe Kubosch <[email protected]> wrote:
> This was sent to me, but was probably meant for there mailing list:
> 
> Begin forwarded message:
> 
>> From: Ingy dot Net <[email protected]>
>> Subject: Re: [Yaml-core] Tabs inside scalars
>> Date: 2011-12-17 20:01:59 GMT+01:00
>> To: Uwe Kubosch <[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]> 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]
>> http://datek.no/
>> 
>> 
>> 
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> 
> --
> Uwe Kubosch
> Systems Developer
> Datek Wireless AS
> [email protected]
> http://datek.no/
> 
> 
> 
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--
Uwe Kubosch
Systems Developer
Datek Wireless AS
[email protected]
http://datek.no/



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