053ed4f790
- types.janet: type-registry, register-protocol-method, find-protocol-method, type-satisfies? - core.janet: rewritten protocol macros (defprotocol, extend-type, extend-protocol, reify) Protocol value stores :jolt/type :jolt/protocol with :methods map Method dispatch fns use fn* [this & rest-args] → protocol-dispatch special form - evaluator.janet: protocol-dispatch, register-method, make-reified special forms satisfies? special form with type registry lookup special-symbol? entries for all 3 protocol ops + satisfies? - 4 test sections (35-38): defprotocol, extend-type, extend-protocol, satisfies? extend-type: basic dispatch works (42 constant), .-field accessor needs further debug satisfies?: fully functional with type registry - 315 ok, 2 fail (pre-existing, unchanged)
1.5 KiB
| name | description |
|---|---|
| jolt-gotchas | Common pitfalls and workarounds discovered during Jolt implementation |
jolt-gotchas
Recurring pitfalls and their fixes discovered across all implementation phases.
PHM/Set Metadata Key Leakage
PHM and set internal keys (:jolt/deftype, :cnt, :buckets, :_meta, :jolt/type, :phm) leak into pairs/keys iteration. Must filter in merge, merge-with, keys, vals, and print-collection.
(when (and (not= k :jolt/deftype) (not= k :cnt)
(not= k :buckets) (not= k :_meta)
(not= k :jolt/type) (not= k :phm)) ...)
Keywords with # Are Invalid Janet Literals
:#inst, :#uuid cause parse errors. Use dynamic table construction:
(let [dr @{}] (put dr (keyword "#inst") fn) dr)
Janet break Only Works in Loops
Does NOT work inside let. Use (var found nil) + (set found val) (break) pattern.
Bare Tuples in eval Are Function Calls
(eval [1 2 3]) calls 1 as function. Use ['tuple 1 2 3] in data-structure emitter.
Janet case for Multi-Arity
Janet lacks Clojure-style multi-arity defn. Use (defn f [& args] (case (length args) 1 ... 2 ...)).
core-renames + core-fn-values Must Stay in Sync
Both tables must be updated together when adding core fns. Missing entries = silent nil returns. "-" is core-sub NOT core--.
set! Field Mutation Reader Quirk
(set! (.-x obj) val) parses as array with .-x symbol head — not as standalone .-x symbol. Check for this case before the (. obj -field) shorthand.