@plurnk/plurnk-mimetypes-text-r

text/x-r mimetype handler for the plurnk ecosystem. Tier 2 — uses the r-lib/tree-sitter-r grammar built to WASM and shipped pre-built (468 KB).

install

npm i @plurnk/plurnk-mimetypes-text-r

No build tools required at install time.

what it does

R's syntactic uniformity (everything is an expression, assignment is just a binary operator) means symbol extraction operates on binary_operator nodes and discriminates by the right-hand side:

• name <- function(...) / name = function(...) / name <- \(...) ... → function (or method if name matches the S3 generic.Class pattern)
• name <- value with SCREAMING_SNAKE_CASE → constant
• name <- value otherwise → variable
• expr -> name (right-assignment) → same dispatch with sides swapped
• setClass(name, ...) → class (S4)
• setGeneric(name, ...) → function (S4)
• setMethod(name, ...) → method (S4)

Three channels per the framework's #10 contract:

• symbols — described above
• deep-json — inherited from TreeSitterExtractor: full named-children walk of the R parse tree
• deep-xml — framework-projected

coverage

Validated against R 4.1+ idioms:

• Both assignment styles (<- and =)
• Lambda syntax (\(x) x * x)
• Variadic params (...)
• Tidyverse pipe chains (%>% and native |>)
• S3 object system (method dispatch by name.Class convention)
• S4 object system (setClass / setGeneric / setMethod)

license

MIT.