go.mod: allow no space before comment, do not allow double slash in unqouted string

[calebdoxsey]

I believe this will fix the issues identified in #2423 .

A space is no longer required after the directive, so both

require// this is now a comment

and

require(

should be matched.

Comments will also be detected within unquoted strings:

    module k8s.io/kubernetes// this is now a comment

Which I believe replicates this line from the parser: https://github.com/golang/go/blob/master/src/cmd/go/internal/modfile/read.go#L546.

Finally anything unmatched is marked as invalid.

[ramya-rao-a]

Thanks @calebdoxsey!

@brainsnail thoughts?

[brainsnail]

Just loaded it up and tested out @calebdoxsey changes. Looks good to me regarding the comment formatting after the keywords.

I'm not super sure about the formatting for unmatched/invalid lines though.

Here's an example where I just entered a line break prior to a matched ( -

The invalid or unmatched highlighting is a nice addition though once that tweak is made.

Thanks again, @calebdoxsey!

[calebdoxsey]

@brainsnail I believe newlines are not allowed after the require keyword. It errors out:

go: errors parsing go.mod:

So I think the highlighting matches the behavior of the go mod parser.

[marco-m]

hello @ramya-rao-a would you have time to have a look?

[marco-m]

thanks!

[calebdoxsey]

Thanks @ramya-rao-a