tree-sitter-rust
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tree-sitter
feature: frontmatter
Did you check the tree-sitter docs?
- [x] I have read all the tree-sitter docs if it relates to using the parser
Is your feature request related to a problem? Please describe.
Rust now supports frontmatter blocks in nightly. See RFC 3503.
These blocks are similar to markdown's fenced code blocks but using dashes instead of backticks.
They're opened with a line of 3+ dashes and an optional infostring, i.e. matching /^-{3,}\s*([^\s,]+)?\s*$/ (for example ---, -----, or --- cargo).
The blocks may contain any characters including dashes.
They are closed by a line matching /^-{n}\s*$/ where n is the number of opening dashes. That will need to be done in scanner.c.
Describe the solution you'd like
Something to match these frontmatter blocks and highlight them as a comment would be nice.
In the future the contents will probably want to be parsed with a language injection depending on the value of the infostring (e.g. TOML for cargo) but I don't think all of that is worked out on the Rust side yet.
Describe alternatives you've considered
An alternative is to just not implement this. It's still unstable.
Additional context
https://rust-lang.github.io/rfcs/3503-frontmatter.html#reference-level-explanation
