ab7ff85816
- loader.janet: load-ns with compile? dispatch, compiled-cache, compiled?, clear-compiled-cache - compiler.janet: compile-ast (Janet data structures for direct eval), compile-and-eval - api.janet: compile-string, compile-file, eval-string dispatches to compile-and-eval when :compile? is true - types.janet: :compile? flag and :compiled-cache table in context env - Stateful forms (def, defmacro, ns, deftype, defmulti, defmethod) fall back to interpreter - All 317 tests pass + 16 new Phase 3 tests
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2.8 KiB
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76 lines
No EOL
2.8 KiB
Markdown
---
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name: jolt-dev
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description: Jolt development workflow — build, test, special form patterns, Janet gotchas
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---
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# Jolt Development
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## Build & Test
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```bash
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cd /Users/yogthos/src/jolt
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jpm build # produces build/jolt
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jpm test # runs all tests
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janet test/foo.janet # run a single test file from project root
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```
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## Compiler Development
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See `jolt-compiler` skill for the Clojure→Janet source-to-source compiler workflow.
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## Janet Eval Pipeline (critical)
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Janet's `(parse s)` does NOT return a parsed form — it returns `[symbol, error-position]`.
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For evaluating Janet source strings, use the parser pipeline:
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```janet
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(def p (parser/new))
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(parser/consume p source)
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(parser/eof p) # REQUIRED — otherwise produce returns nil
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(def form (parser/produce p))
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(eval form)
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```
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**Never** try `(eval [if true 1 2])` — Janet's `eval` doesn't recognize special forms in tuple data structures.
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## `var` vs `def`
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When you need to mutate a local with `set`, use `(var x nil)` not `(def x nil)`. `def` creates constants.
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## Special Form Checklist
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To add a new special form to the evaluator:
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1. Add the name to `special-symbol?` in `src/jolt/evaluator.janet`
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2. Add a match arm in `eval-list` (the match on `name`)
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3. Add tests in `test/evaluator-test.janet`
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The match arm receives `ctx`, `bindings`, and `form` (the full list). Use `(in form 1)` for first arg, etc.
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**Non-symbol heads** (keywords, etc.): `eval-list` first checks `(and (struct? first-form) (= :symbol (...)))` before extracting `name`. If not a symbol, falls through to default function application.
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### Current special forms (22):
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`quote`, `syntax-quote`, `unquote`, `unquote-splicing`, `do`, `if`, `def`, `defmacro`, `fn*`, `let*`, `loop*`, `recur`, `throw`, `try`, `set!`, `var`, `locking`, `instance?`, `defmulti`, `defmethod`, `deftype`, `new`, `.`
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## Persistent Data Structures
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Located in:
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- `src/jolt/clojure/lang/persistent_vector.clj`
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- `src/jolt/clojure/lang/persistent_hash_map.clj`
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Loaded at init time by `load-persistent-structures` in `api.janet`. Use `{:mutable? true}` to skip and use Janet-native types.
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### Implementation detail
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Simple array-based implementation (node-assoc/node-find/find-key-index), NOT HAMT bit-trie.
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HAMT failed because Janet uses 64-bit doubles and bit operations require 32-bit signed ints.
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## Janet Gotchas
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- Bit operations (brshift, brushift, band) use 32-bit signed integers. Hash values can exceed 32-bit range. Use `(band x 0xFFFFFFFF)` before shifting.
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- `deftype` creates tables, not structs. `struct?` returns false.
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- `(get child :key)` DOES follow table prototype chain — resolved and confirmed working.
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- Janet LSP produces many false positives on `.janet` files — safe to ignore.
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## Symbol representation
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Jolt symbols are `{:jolt/type :symbol :ns <string-or-nil> :name <string>}` as produced by the reader. |