Language support

Repowise ships language-aware resolvers under packages/core/src/repowise/core/ingestion/resolvers/. Every language lands on one rung of a five-rung ladder, and the rung decides which pipeline stages produce meaningful output. Languages below the parsing rungs still appear in the wiki and still carry git history.

Coverage matrix#

Tree-sitter parsing stops after the Partial rung. The first three rungs are the 26 languages parsed to a full AST; all five rungs are the 40 on the ladder. Both numbers are worth stating and neither is worth stating alone, so the useful thing to take from this page is the rung your language sits on rather than either count.

SQL and shell sit outside the ladder on purpose, because each has a coverage shape the rungs cannot describe. SQL is parsed by sqlglot rather than tree-sitter and gets symbols, wiki pages and health markers but no call graph, with import edges only inside a dbt project. Shell gets symbols, source edges and function-level complexity, but reachability means little for a script invoked by name.

What each tier gets from the pipeline#

Scala's import resolution is partial: it shares the JVM index with Java and Kotlin and falls back to parsing SBT or Mill build files. Every other Full and Good language resolves imports outright.

COBOL is excluded from dead-code claims. JCL, schedulers and dynamic program calls are external entry paths the repository graph cannot observe, so a COBOL program that nothing in the repo calls is not evidence that nothing calls it.

GDScript has a dedicated import resolver and Godot-specific framework edges, but no named bindings. Scenes, autoloads and class_name declarations connect scripts that no import statement ever linked.

Svelte and Vue share the TypeScript resolver: a single-file component's <script> block and markup expressions are projected to a TypeScript buffer at byte-identical offsets, so the same queries, config and code-health dialects apply.

Framework awareness#

Repowise recognises common framework conventions and emits edges for them, even when the underlying call goes through a decorator or a runtime registry.

Dead-code awareness#

The dead-code detector knows about dynamic dispatch patterns that look unused to a static analyzer but aren't:

• Naming patterns: *Plugin, *Handler, *Adapter, *Middleware
• Dynamic imports: importlib.import_module(), __import__(), dynamic require()
• Framework convention files (Flask blueprints, FastAPI routers, Django apps, Rails controllers, Laravel providers, TYPO3 extensions)
• Deprecation annotations: @Deprecated, [Obsolete], @deprecated and their siblings feed a finding's confidence
• Symbols a docs build or an API dump names, and symbols reached by a framework, a container, or a registration decorator

These are excluded from safe_to_delete findings to keep the false-positive rate near zero.

Code-health marker rollout#

Health markers run off a per-language walker map that is independent of .scm parsing, so a language can parse perfectly for the graph and still need this map before markers fire. This table is most of the reason a language is Full rather than Good.

C, F# and Objective-C reach the complexity walker and carry real cyclomatic complexity and maintainability numbers, without the rest of the marker suite.

Every cell is a deliberate call rather than an oversight: a language reaches a dialect or it stays silent, and an n/a records a metric the language cannot carry rather than one nobody got to. Kotlin's Extract Method is blocked on the grammar, not unscheduled.

Adding a language#

Adding new language support is five required steps: a LanguageSpec module, a manual LanguageTag registration, a tree-sitter .scm query file, a LanguageConfig entry, and the grammar dependency. Two of those are one-line registrations, but the LanguageTag edit can't be derived and has to be made by hand. No changes to parser.py, graph.py, or any other analysis core file. See architecture/language-support.md in the OSS repo for the full recipe, including the optional steps that buy heritage extraction, named bindings, and call resolution.