Re: Top level block scalar without indentation

Well, example 9.5 is pretty explicit in what the spec says. Note that the
auto-detect does not return 0, it returns at least 1, but since we start
with -1 this results with an overall 0 indentation (since production 207
uses -1 and not 0).

The same logic holds for both of your samples; example 9.3 shows an
unindented plain at the top level.

Oren.



On Sat, Apr 13, 2013 at 2:10 PM, KOSEKI Kengo <[email protected]> wrote:

> Hi,
>
> I noticed that LibYAML doesn't parse block scalar without indentation.
>
>   Sample: 1
>   ---
>   XXX
>   YYY
>   ZZZ
>
>   Sample: 2
>   --- |
>   XXX
>   YYY
>   ZZZ
>
> I expected that these samples would be parsed like this:
>
>   [{"Sample": 1}, "XXX YYY ZZZ"]
>   [{"Sample": 2}, "XXX\nYYY\nZZZ\n"]
>
> LibYAML can parse Sample 1 but not Sample 2.
>
>   $ ./run-parser Sample1.yaml
>   [1] Parsing 'Sample1.yaml': SUCCESS (11 events)
>
>   $ ./run-parser Sample2.yaml
>   [1] Parsing 'Sample2.yaml': FAILURE (10 events)
>
> PyYAML returned error.
>
>   expected '<document start>', but found '<scalar>'
>
>
> I checked some implementations. The results are:
>
>   Syck (YAML 1.0) - Ruby
>     Sample1 ... PASS
>     Sample2 ... PASS
>
>   YAML.pm (YAML 1.0) - Perl
>     Sample1 ... FAIL
>     Sample2 ... PASS
>
>   PyYAML (YAML 1.1) - Python / LibYAML
>     Sample1 ... PASS
>     Sample2 ... FAIL
>
>   Psych     (YAML 1.1) - Ruby / LibYAML
>     Sample1 ... PASS
>     Sample2 ... FAIL
>
>   SnakeYAML (YAML 1.1) - Java / based on LibYAML
>     Sample1 ... PASS
>     Sample2 ... FAIL
>
>   JS-YAML (YAML 1.2) - JavaScript
>     Sample1 ... PASS
>     Sample2 ... PASS
>
>   Yamerl (YAML 1.2) - Erlang
>     Sample1 ... PASS
>     Sample2 ... PASS
>
>
> My questions are:
>
>   (1) Which parsers are implemented properly, at this point?
>   (2) Is there possibility that LibYAML support Sample2?
>       At YAML 1.1 trunk or future 1.2 branch?
>
>
> In YAML 1.0 spec, Example 4.21 says:
>
>   --- |
>   Usually top level nodes are not indented.
>
> In YAML 1.2 spec, Example 9.5 says:
>
>   %YAML 1.2
>   --- |
>   %!PS-Adobe-2.0
>   ...
>
>   %YAML 1.2
>   ---
>   !!str "%!PS-Adobe-2.0\n"
>   ...
>
> I couldn't find an example like these in the YAML 1.1 spec.
> It may be determined by [161] detect(m) being able to return 0 or not.
>
>
> I found this message.
>
>  * http://osdir.com/ml/text.yaml.general/2008-07/msg00001.html
>
> > The spec requires that continuation lines of a flow scalar are indented
> > with at least one space. LibYAML relaxes this rule by allowing
> > multi-line flow scalars not to be indented,
>
> So I realized that the Sample1 result was came from relaxing
> the spec. But how about the block scalar, Sample 2?
>
>
> I think this notation is important, because this enable to append
> metadata to the plain text.
>
> An email will be represented like this.
>
>   Date: 2013-04-13 20:10:53+09:00
>   Subject: Top level block scalar without indentation
>   From: [email protected]
>   To: [email protected]
>   --- |
>   Hi,
>   I noticed that ...
>
>
> Using template engine to generate HTML.
>
>   title: YAML block scalar
>   template: blog
>   published: 2013-04-13
>   --- |
>   <article>
>     <h1>xxxxxx</h1>
>     <pre>
>       Here must
>       be written in
>       multi lines.
>     </pre>
>   </article>
>
>
> Best regards,
>
> --
> koseki
>
>
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analytics on semi-structured data. The platform includes APIs for building
apps and a phenomenal toolset for data science. Developers can use
our toolset for easy data analysis & visualization. Get a free account!
http://www2.precog.com/precogplatform/slashdotnewsletter

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