[TxMt] Re: Defining a regular expression looking like a grammar

[Allan Odgaard]

On 17 Oct 2018, at 17:36, Jacob Carlborg wrote:

> This is exactly according to the specified grammar [3] and it seems to 
> be working as expected. Not sure if the optional group workaround 
> causes some performance implications.
>
> This technique seems like it could be a viable alternative to 
> supporting variables in the TextMate grammar as has been discussed 
> before.

Just to be clear, you are talking about variables from the parsed 
language and highlighting them later in the scope, right?

So something like: `let foo = 42 in … something_with foo …` and here 
the latter instance of `foo` would be marked as a variable?

To be honest, I don’t follow this 100%; it seems highly impractical to 
have one big regular expression for the language because then we cannot 
save parser state and restart parser on the line that got edited, which 
would be a major performance issue.

I am also not sure how this variable thing would work in a typical 
language where you can define an arbitrary number of variables on 
basically any given line.
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