Re: EBNF for Diet YAML

Well, how's this any better than json?

On Thursday, June 26, 2014, Trans <[email protected]> wrote:

> I have been thinking more and more about the need for a light-weight
> version of YAML, especially after reading
> https://github.com/toml-lang/toml#but-why, and learning that Rust's new
> packages manager apparently will be using TOML. There are some things to
> like about TOML, after all it is essentially the old INI format with a
> couple of extra features. But it's those extra features that cause me rage
> --they are down right ugly and confusing.
>
> Anyway, I wanted to see if I could put together a EBNF for a "diet YAML"
> --basically a YAML without types, complex map keys, etc. Just the basics
> people use to hand write configuration files and such. How does this look
> so far:
>
>   Yaml ::= Data*
>   Data ::= (Scalar | Sequence | Mapping )
>   Scalar ::= (Number | String | Date | Boolean | Nil)
>   Sequence ::= (InlineSequence | IndentedSequence)
>   InlineSequence ::= "[" Data ("," Data)* "]"
>   IndentedSequence ::= OptionalTab "-" Data ("\n" OptionalTab "-" Data)*
>   Mapping ::= ( InlineMapping | IndentedMapping )
>   InlineMapping ::= "{" Key ":" Data ("," Key ":" Data)* "}"
>   IndentedMapping ::= Tab Key ":" Data ("\n" Tab Key ":" Data)*
>   OptionalTab ::= Space*
>   Tab ::= Space+
>   Key ::= Scalar
>   String ::= '"' [A-Za-z0-9]* '"' | [A-Za-z0-9]+
>   Number ::= ("+" | "-")? [0-9]* ("." [0-9]+)?
>   Date ::= [0-9][0-9][0-9][0-9] "-" [0-1][0-9] "-" [0-3][0-9] ( [0-2][0-9]
> ":" [0-5][0-9] ":" [0-5][0-9] )?
>   Boolean ::= "true" | "false"
>   Nil ::= "~"
>   Space ::= " "
>
> What am I missing? What needs fixing?
>
> Note, you can put this code into http://bottlecaps.de/rr/ui and get a
> nice picture of it all. Any one else have a good tool for drawing these?
>
>
> trans
>
>

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