496f169a2e
- types.janet: all-ns, remove-ns, create-ns, the-ns, ns-interns, ns-aliases, ns-imports-fn - core.janet: core-binding macro, core-push-thread-bindings, core-pop-thread-bindings wired into core-bindings and core-macro-names - evaluator.janet: - ns accessor special forms: all-ns, the-ns, create-ns, remove-ns, ns-interns, ns-aliases, ns-imports, ns-resolve - ns form extended: :require/:refer, :use, :refer-clojure/:exclude, :import - eval-require extended: :refer support - compiler-test.janet: Phase 1 tests (ns accessors + ns form extensions) - pre-existing delimiter fix in core-binding macro brackets All 317 tests pass, 0 failures. |
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|---|---|---|
| .clj-kondo/.cache/v1 | ||
| .dirge | ||
| .lsp/.cache | ||
| src/jolt | ||
| test | ||
| vendor | ||
| .gitignore | ||
| .gitmodules | ||
| fix-core.janet | ||
| LICENSE | ||
| preprocess.janet | ||
| project.janet | ||
| README.md | ||
| test-defprotocol.janet | ||
| test-eval.janet | ||
| test-form15.janet | ||
| test-ivar.janet | ||
| test-load-sci.janet | ||
| test-parse-utils.janet | ||
Jolt
A Clojure interpreter running on Janet. Jolt reads Clojure source text, evaluates it using an interpreter written in pure Janet, and exposes a Clojure-compatible standard library. The goal is a Janet-hosted SCI runtime — minimal bootstrapping, with SCI as the standard library.
What's inside
Jolt implements the core of Clojure in a single-process Janet project:
Reader — A recursive descent parser for Clojure syntax: symbols, keywords, numbers, strings, characters, lists, vectors, maps, sets, quote forms, reader macros (#(), #_, #?), metadata, deref, and tagged literals.
Evaluator — A tree-walking interpreter with 22 special forms (quote, do, if, def, defmacro, fn*, let*, loop*/recur, throw, try, set!, var, locking, instance?, defmulti, defmethod, deftype, new, ., etc.), syntax-quote with unquote and unquote-splicing, a macro system with &env support, destructuring (:keys and sequential), and namespace forms (ns, require, in-ns).
Core library — 145+ bindings from clojure.core: predicates, math with Clojure arity semantics, comparison, collections, sequences, higher-order functions, string functions, I/O, atoms, macros (when, when-not, if-let, when-let, if-some, when-some, doto, fn, let, defn, defrecord, defprotocol), and SCI bootstrap stubs.
SCI bootstrap — All 317 forms from SCI's 9 core source files (macros, protocols, types, unrestrict, vars, lang, utils, namespaces, core) load with zero failures. 46 namespaces are populated with 900+ bindings. SCI's eval-string is replaced with a Jolt-native implementation.
Quick start
git clone https://github.com/yogthos/jolt.git
cd jolt
git submodule update --init # pulls vendor/sci
jpm build # compiles build/jolt
build/jolt # drops into REPL
Build
jpm build
This compiles src/jolt/*.janet into a standalone build/jolt executable. Requires Janet ≥ 1.36 and jpm.
Run
build/jolt
Drops into a read-eval-print loop where you can type Clojure expressions:
user=> (+ 1 2)
3
user=> (map inc [1 2 3])
[2 3 4]
user=> (defn fib [n] (if (< n 2) n (+ (fib (- n 1)) (fib (- n 2)))))
#'user/fib
user=> (fib 10)
55
Test
jpm test
Runs all tests: API, bootstrap, core, evaluator, macro, namespace, reader, types, and SCI load.
Use as a library
(use jolt/api)
(def ctx (init))
(eval-string ctx "(+ 1 2)") ;; → 3
(eval-string ctx "(map inc [1 2 3])") ;; → [2 3 4]
(eval-string ctx "(def x 42)") ;; → #'user/x
(eval-string ctx "x") ;; → 42
(init) returns a context with clojure.core loaded. Pass it to eval-string to evaluate Clojure source. Each context is isolated — use separate contexts for separate evaluation environments.
Project structure
src/jolt/
types.janet — Var, Namespace, Context, symbol helpers
reader.janet — recursive descent parser for Clojure syntax
evaluator.janet — tree-walking interpreter
core.janet — 145+ clojure.core bindings
api.janet — public API: init, eval-string, eval-string*
main.janet — REPL entry point
test/ — 8 test suites + SCI load test
vendor/sci/ — SCI submodule (git submodule)