Kusto

[Iain-S]

Summary

Add lexer for Kusto.

Also corrects a minor typo in the docs.

Checks

• tox tests pass
• Run tox -e mapfiles

Linting

• black
• flake8
• isort

Closes

This (hopefully) closes #2098

Further Work \ Known Limitations

• There are other number formats, such as 1e5, which we don't currently support.
• Datetime literals (e.g. datetime(2015-12-31) should all be treated as a single literal but we simply mark datetime as a keyword.
• Normal or verbatim strings can be obfuscated by pretending either h or H but we ignore this and would treat h/H as a name.

[Iain-S]

I've made the suggested changes. Let me know if you want me to squash any commits.

[jeanas]

@Iain-S I've pushed a commit, mostly to make the code style more like the rest of the code base (note that we do not use Black).

I've also noticed that this state:

        "multi_string": [
            (r"[^`]+", String),
            (r"```", String, "#pop"),
        ],

does not allow single backticks inside ```-delimited strings. I suppose this is not intentional, right? In that case, it needs an extra rule (r"`", String)`.

[Iain-S]

I suppose this is not intentional, right? In that case, it needs an extra rule (r"`", String)`.

True, that was an oversight. I've added your suggested tuple and a test to confirm that it works.

[jeanas]

LGTM now, thank you.