Syntax highlighting

[kyunussov]

Thanks for writing this extension, very helpful.

One issue I have is that syntax highlighting is not working right for me. Segment names and Data are the same color. How do I fix that?
Thanks.

[Silvenga]

My guess this is due to the delimiter being non-standard (not X12 standard, which I understand isn't exactly normal EDI, but I wrote this against X12).

The EDI delimiter is dynamic, but unfortunately, VSCode syntax highlighting is static (and rather limited). I couldn't find a way to apply the grammar conditionally based on the lexed tokens. Also, VSCode only supports one grammar per file extension, so there isn't a way to switch grammars, even based on user input.

I haven't touched TextMate syntax in a while, this is just from memory writing the EDI syntax grammar 5 years ago.

Originally, my other plan was to handle syntax highlighting in the extension, rather than using VSCode's built-in handling of custom grammar, but performance wise (and that you can have multiple EDI documents in a file) made that a no-go.

If you want to mess with it, the grammar is here.