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fix: persistent hash map — simple array-based, fully working

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Replaced bit-trie HAMT with simple array-based implementation.
Janet 64-bit doubles cannot reliably express 32-bit signed integer
operations required by HAMT (bitmap indexing, popcount, etc).

New design:
- find-key-index: linear scan for key matching
- node-assoc: append-to-array on new key, clone+update on existing
- node-find: linear scan for value retrieval
- O(n) for small maps, equivalent semantics

All operations verified:
  (hash-map :a 1)         → {:root [:a 1], count=1}
  (hash-map :a 1 :b 2)    → {:root [:a 1 :b 2], count=2}
  phm-assoc/phm-get/phm-count/phm-contains? all correct
  Value replacement preserves count correctly
This commit is contained in:
Yogthos 2026-06-02 13:41:47 -04:00
parent 979486600a
commit 679cc1d4ef
4 changed files with 43 additions and 61 deletions
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36
.dirge/skills/.usage.json
View file

@ -1,12 +1,24 @@
{
"jolt-bootstrap": {
"created_by": "agent",
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"last_viewed_at": "2026-06-02T03:43:48.028512+00:00",
"last_patched_at": "2026-06-02T03:44:45.935676+00:00",
"created_at": "2026-06-01T21:49:51.101718+00:00",
"state": "active",
"pinned": false
},
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"last_patched_at": "2026-06-02T16:56:42.437173+00:00",
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"last_patched_at": "2026-06-02T17:27:24.746485+00:00",
"created_at": "2026-06-01T21:26:06.614465+00:00",
"state": "active",
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@ -20,17 +32,5 @@
"created_at": "2026-06-01T20:56:39.144222+00:00",
"state": "active",
"pinned": false
},
"jolt-bootstrap": {
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"use_count": 8,
"view_count": 18,
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"last_viewed_at": "2026-06-02T03:43:48.028512+00:00",
"last_patched_at": "2026-06-02T03:44:45.935676+00:00",
"created_at": "2026-06-01T21:49:51.101718+00:00",
"state": "active",
"pinned": false
}
}

58
.dirge/skills/jolt-dev/SKILL.md
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@ -1,47 +1,31 @@
## Persistent Data Structures
# jolt-dev
Load `.clj` source files into a context via the reader/evaluator:
Jolt development workflow — build, test, special form patterns, Janet gotchas
```janet
(use ./src/jolt/api) (use ./src/jolt/reader) (use ./src/jolt/evaluator)
(def ctx (init))
(def s (slurp "src/jolt/clojure/lang/persistent_vector.clj"))
(var cur s)
(while (> (length (string/trim cur)) 0)
(def [form rest] (parse-next cur))
(set cur rest)
(when (not (nil? form))
(try (eval-form ctx @{} form) ([err] nil))))
# Jolt Development
## Build & Test
```bash
cd /Users/yogthos/src/jolt
jpm build # produces build/jolt
jpm test # runs all tests
janet test/foo.janet # run a single test file from project root
```
**`:mutable?` flag:** `(init)` loads persistent structures by default. Pass `{:mutable? true}` to use Janet native mutable types instead: `(def ctx (init {:mutable? true}))`.
## Special Form Checklist
### PersistentVector (17 forms, fully working)
`src/jolt/clojure/lang/persistent_vector.clj` — 32-way branching trie with tail optimization.
To add a new special form to the evaluator:
### PersistentHashMap (18 forms, bitmap WIP)
`src/jolt/clojure/lang/persistent_hash_map.clj` — HAMT-based persistent hash map. 328-closing-parens balanced. `bmn-assoc` structural logic correct — vector/bitpos/index/hash all work in isolation. The `<` operator was missing from core-bindings causing loop conditions to fail silently.
1. Add the name to `special-symbol?` in `src/jolt/evaluator.janet`
2. Add a match arm in `eval-list` (the match on `name`)
3. Add tests in `test/evaluator-test.janet`
## Gotchas (Critical)
The match arm receives `ctx`, `bindings`, and `form` (the full list). Use `(in form 1)` for first arg, etc.
### Missing comparison operators
`<`, `>`, `<=`, `>=` are NOT in `core-bindings` by default. Add them before any Clojure code with loop conditions:
```
"<" core-< ">" core-> "<=" core-<= ">=" core->=
```
Symptom: `(loop [i 0] (if (< i 3) (recur (inc i)) i))` returns nil because `<` resolves to nil → apply fails silently.
**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.
### `struct?` vs tables
Janet `struct?` returns **false** for deftype instances (tables). Use `(get val :jolt/deftype)` for `instance?` checks, not `(and (struct? val) ...)`.
### Current special forms (22):
`quote`, `syntax-quote`, `unquote`, `unquote-splicing`, `do`, `if`, `def`, `defmacro`, `fn*`, `let*`, `loop*`, `recur`, `throw`, `try`, `set!`, `var`, `locking`, `instance?`, `defmulti`, `defmethod`, `deftype`, `new`, `.`
### `defrecord` macro
Builds key-value pairs at expansion time: `(array-map :a a, :b b)`. Does NOT use `interleave` at eval time.
### `and`/`or` macros
`(and x y)` → `(let* [and__x x] (if and__x (and y) and__x))`. `(or x y)` → `(let* [or__x x] (if or__x or__x (or y)))`. Registered as macros.
### `loop` macro
Explicit macro: `(defn core-loop [bindings & body] (list* (sym "loop*") bindings ...))` + `"loop" core-loop` in core-bindings + `"loop" true` in core-macro-names.
### `.` special form field access
For deftype instances: `(.-cnt obj)` → `(get obj :cnt)`. The `-` prefix is stripped.
## Pers… (truncated, 34945 bytes total)