Fix syntax highlighting for quoted expressions and types

[nicolasstucki]

• Add fix to VS code
• Add fix to GitHub (Update Scala syntax grammar github-linguist/linguist#4044)

We are currently using the first kind of quote to avoid formatting issues as shown below. Currently ' assumes that it contains a single Char or an encoded Char such as '\n'.

It would be good to make it an alias to allow users to copy-paste code from the documentation. I have already had this issue and the error message is not that helpful.

val expr1 = ’{ 1 + x }
val expr2 = ’{ y - 9 }

val expr1 = '{ 1 + x }
val expr2 = '{ y - 9 }

'[Int]
'[List[Int]]

Screenshot:

[smarter]

According to https://github.com/github/linguist/blob/master/vendor/README.md, syntax highligthing for Scala in Github is done using https://github.com/mads-hartmann/scala.tmbundle/tree/master/Syntaxes. The grammar could be fixed there.

[smarter]

In fact, the syntax highlighting of ' is already broken in some cases: mads-hartmann/scala.tmbundle#59

[nicolasstucki]

For the record, the same issue exists in the IDE.

[smarter]

Yes, because the IDE syntax highlighting file is based on the one from https://github.com/mads-hartmann/scala.tmbundle/tree/master/Syntaxes :).

[nicolasstucki]

Perfect, we only need to fix one highlighter :)

[odersky]

I would say, let's do both: Fix the syntax highlighting and introduce the alias.

[nicolasstucki]

mads-hartmann/scala.tmbundle#63 fixes the highlighting issue with the quoted symbols. We should try to enhance that fix to also fix quoted expressions and types.

[smarter]

The PR you link to has been open for 16 days with zero response. If the repo owner is unresponsive we should consider forking it and somehow convince Github to switch to our version.