feat(extract): add regex-based R (.r/.R) extractor (#1689)#1759
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Summary
Adds a real extractor for R (
.r/.R), resolving the actionable half of #1689: R files were classified as code (.ris inCODE_EXTENSIONS) but had no extractor wired into_DISPATCH, so every R file silently contributed zero nodes to the graph. The#1689warning (already at HEAD) surfaced the gap; this PR closes it.Why regex, not tree-sitter
Unlike every other language graphify depends on, there is no standalone
tree-sitter-rdistribution on PyPI (tree-sitter-r/tree-sitter-rlangboth 404; verified via the PyPI JSON API andpip index). The only pip-installable R grammar is the ~165-grammartree-sitter-language-pack, which cuts hard against this repo's one-dedicated-wheel-per-language convention.So this follows the existing regex-fallback precedent already used for Pascal (#781) and the non-tree-sitter path for DM (#1104): a self-contained, zero-dependency regex extractor in
graphify/extractors/r.py.pyproject.tomlis untouched — no new dependency.An AST-quality upgrade is a clean future follow-up if/when a standalone R grammar wheel becomes available; the module is structured so that swap is localized.
What it extracts
f <- function(x),g = function(x),h <<- function(),k <- \(x) xcontainsnode/edgelibrary(dplyr),require(ggplot2),requireNamespace(...),loadNamespace(...)imports(context=import)source("helpers.R")imports(context=import)setClass("Circle", ...),setRefClass(...)containsnodesetClass("Circle", contains = "Shape")inheritsedgesetGeneric("area", ...)containsnodesetMethod("area", "Circle", ...)methodedge (class → method)calls(context=call)The extractor is string- and comment-aware (a
#inside a string literal is not a comment; braces/parens inside strings don't affect body-span matching), and skips accessor/namespace-qualified call targets (obj$m(),obj@m(),pkg::fn()) so only genuine local free-function calls becomecallsedges.Wiring
graphify/extractors/r.py— new module (mirrorsextractors/elixir.pylayout, reusesbase.pyhelpers_make_id/_file_stem).extract.py— import + re-exportextract_r;.r/.R→_DISPATCH; language-name map entry;Rscript→_SHEBANG_DISPATCH(so#!/usr/bin/env Rscriptextensionless scripts route correctly); updated the#1689warning comment (it no longer applies to.r).Tests
tests/fixtures/sample.R— new fixture exercising every construct.tests/test_languages.py— 12 new R tests (functions,\(x)lambda, imports incl.source(), S4 classes, inheritance, generics/methods, calls, call-context, no-dangling-edges).tests/test_extract.py— updated the two tests that used.r/.Ras their "code file with no AST extractor" example (that's no longer true) to use.ets(ArkTS), which remains genuinely unsupported.Local run (on
v8):tests/test_languages.py+tests/test_extract.py= 442 passed, 14 skipped, no regressions. The 12 new R tests and the two updated#1689tests all pass.Closes the extractor half of #1689.