Robert Wilton <rwil...@cisco.com> wrote:
> Hi Martin,
>
> I was looking at the YANG ABNF grammar a bit more last night (to see
> how hard it would be to write a parser for it) and I had a couple more
> observations. Apologies that this is after the WG last call ...
>
> 1. [Trivial] The indentation of the range statement in 9.3.5 looks
> wrong.
>
> 9.3.5. Usage Example
>
> typedef my-decimal {
> type decimal64 {
> fraction-digits 2;
> range "1 .. 3.14 | 10 | 20..max";
> }
> }
>
>
> I presume that it should be:
>
> 9.3.5. Usage Example
>
> typedef my-decimal {
> type decimal64 {
> fraction-digits 2;
> range "1 .. 3.14 | 10 | 20..max";
> }
> }
Fixed.
> 2. The description of yang-char (around page 186) doesn't seem to be
> quite accurate (relative to description of legal characters in 6. YANG
> Syntax), and given that it excludes character values outside the
> unicode range.
Hmm, which characters are outside the unicode range?
> ;; any Unicode character including tab, carriage return, and line
> ;; feed, but excluding the other C0 control characters, the surrogate
> ;; blocks, and the noncharacters.
> yang-char = %x9 / %xA / %xD / %x20-D7FF /
> ...
>
>
> Should this be:
>
> ;; any Unicode or IOS/IEC 10646 character including tab, carriage return,
> ;; and line
> ;; feed, but excluding the other C0 control characters, the surrogate
> ;; blocks, and the noncharacters.
> yang-char = %x9 / %xA / %xD / %x20-D7FF /
I think this would be ok.
> 3. There are lots of comments where "these stmts can appear in any
> order", e.g.
>
> linkageStmts = ;; these stmts can appear in any order
> *importStmt
> *includeStmt
>
> Am I right in interpreting that there can be any number of import and
> include statements and they can be interleaved in any arbitrary
> order?
Yes.
> E.g. this specific example (but not in the general case) could equally
> have been written *(importStmt / includeStmt).
Well, the grammar defines the canonical order. With the alternative
rule above, the canonical order would be different.
/martin
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