Use post-parse `JuliaSyntax.tokenize()` API

[c42f]

Going through the parser allows us to be more precise and complete.

For example it automatically:

• Determines when contextual keywords are keywords, vs identifiers. For example, the outer in outer = 1 is an identifier, but a keyword in for outer i = 1:10
• Validates numeric literals (eg, detecting overflow cases like 10e1000 and flagging as errors)
• Splits or combines ambiguous tokens. For example, making the ... in import ...A three separate . tokens.

Also uses is_error to detect error tokens and highlight them with the error color.

Requires https://github.com/JuliaLang/JuliaSyntax.jl/pull/221

As I was writing this, I noticed that the syntax highlighter has some heuristics in it to act a bit like a parser (just a very little bit!). For example, highlighting quoted symbols a different color.

So I'm not sure this is the best approach long term - maybe we should just be using the parsed GreenTree instead for highlighting. It would give us several options for richer highlighting. Also, if using the parser itself, we'd be able to highlight any syntax error ranges (not just token errors).

Regardless of that, though, this is a straightforward modification we can do right away...

Screenshot showing outer and abstract contextual keywords highlighted correctly and some token errors

[c42f]

Note that the tests here won't work until https://github.com/JuliaLang/JuliaSyntax.jl/pull/221 is merged and a new JuliaSyntax release is deployed.

[c42f]

I released JuliaSyntax-0.3.3 to make this work if you can kick off CI again. @KristofferC 0.3.3 contains your precompile changes and the new tokenize() API required by this PR, but not the breaking changes to the tree data structures I've been doing in the last week.

[codecov-commenter]

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[KristofferC]

I need to update the colorschemes to show a nice red background on errors like in your screenshot.

[c42f]

Oops, I'd broken the docs build with this. Hopefully that's fixed now.

[c42f]

Cool yes updating the color schemes makes sense. I just have this in my startup.jl at the moment.

            cs = OhMyREPL.Passes.SyntaxHighlighter._create_distinguished()
            OhMyREPL.Passes.SyntaxHighlighter.error!(cs,
                OhMyREPL.Crayon(background = (120,50,50)))
            OhMyREPL.Passes.SyntaxHighlighter.add!("myscheme", cs)

We can maybe do better with the errors if we use the full parser but there's a bit of a balance there in terms of avoiding distracting the user when they haven't finished typing. (Might need some heuristic to not report errors due to incomplete syntax etc.) Something for another time anyway.