Re: Draft 2008-04-06

Hello all,

I don't know if these qualify as omissions, bugs, or just misunderstandings
on my part.  I was attempting to track down why ypaste (terrific tool) was
not accepting this document:

---
-1
...

The spec says,

7.3.3. Plain Style
...
Plain scalars must not begin with most indicators, as this would cause
ambiguity with other YAML constructs. However, the ":", "?" and "-"
indicators may be used as the first character if followed by a non-space
character, as this causes no ambiguity.
...

So I expected the above document to be okay.  I started to experiment with
the three stated indicators.  The streams below demonstrate what I've found
so far.

This first stream shows that the colon indicator ':' seems to work as the
spec
states, i.e., it may be the first character of a plain scalar if the
following
character is not whitespace.

---
# scalar value ':v'
- :v
---
# scalar value ':v'
k: :v
---
# scalar key ':k'
:k:
---
# scalar value ':s'
:s
...

The next two streams show that the hyphen '-' and question mark '?'
indicators work as the spec states unless (apparently) they appear as
the first non-whitespace character, um, somewhere other than where
they do work--it's not quite clear to me where that is.  (Obviously,
below they are the first character on the line, but the next example
demonstrates another location.)

---
# scalar value '-v'
- -v
---
# scalar value '-v'
k: -v
---
# fails: expected scalar key '-k'
-k:
---
# fails: expected scalar value '-s'
-s
...

---
# scalar value '?v'
- ?v
---
# scalar value '?v'
k: ?v
---
# fails: expected scalar key '?k'
?k:
---
# fails: expected scalar value '?s'
?s
...

The next stream shows another location where similarly ':' is accepted as
the first character, but '-' and '?' are not.

---
# simple sample, i.e., [{key: value}]
- key: value
---
# scalar key ':key', i.e., [{':key': value}]
- :key: value
---
# fails: expected scalar key '-key'
- -key: value
---
# fails: expected scalar key '?key'
- ?key: value
...


Regards,

-- Brad

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