KidLisp (Swift port, Menuband) #

Native Swift implementation of KidLisp. Linked into the MenuBand executable but designed to be independent of AppKit (Foundation only) so it can render headlessly from the CLI for conformance testing.

Decree conformance: KidLisp Decree '26: Core — phase 1 corpus only. See kidlisp/SCORE.md for the full runtime registry.

Files #

File	Role
`KLColor.swift`	Pixel color + 147-entry CSS color table
`KLLexer.swift`	Tokenizer (paren/comma/newline/ident/number)
`KLExpr.swift`	AST: number, symbol, list, bareForm, atom, program
`KLParser.swift`	Tokens → AST. Top-level statements separate on `,` and `\n`
`KLRNG.swift`	Seedable PCG32 for deterministic conformance frames
`KLFramebuffer.swift`	CPU RGBA8 buffer + `wipe`/`line` (Bresenham)/`blur` (separable box) + PPM writer
`KLEvaluator.swift`	Tree-walker. Heads: `wipe`, `ink`, `line`, `blur`
`KLRuntime.swift`	Top-level facade: `KLRuntime.render(source:width:height:)`
`KLCLI.swift`	Headless `--kidlisp-render` flag handler

Headless renderer #

swift build
./.build/debug/MenuBand --kidlisp-render '<source>' <width> <height> <out.ppm> [seed]

Examples (phase 1 corpus):

./.build/debug/MenuBand --kidlisp-render 'blue' 256 256 /tmp/4xa.ppm
./.build/debug/MenuBand --kidlisp-render '(wipe blue)' 256 256 /tmp/wib.ppm
./.build/debug/MenuBand --kidlisp-render 'purple, ink, line, blur 5' 256 256 /tmp/bop.ppm

Status #

Phase	Corpus	Heads	Status
1	`$bop` · `$wib` · `$4xa`	wipe, ink, line, blur, bare-color-wipe	✅ done
2	`$pie` · `$39i`	`(fps N)`, timing tokens, magic vars (w/h/frame), scroll, flood, circle, zoom, contrast	not started
3	`$roz` · `$ceo`	`fade:` gradients, `:frame` animation, spin, coat, `?`/`...`	claims `RBP-26` when done
4	`$cow`	`$code` embed (recursive eval + source fetch)	not started
5	`$4bb`	`bake`/`burn` offscreen pages	not started

When phase 3 lands, we can publish KidLisp Decree '26: Core + Render + RBP-26.

Not yet ported from kidlisp.mjs #

Audio API (amp, mic, melody, overtone) — Decree Audio level
3D primitives (cube, form, trans)
Text rendering (write, font tables)
All transformation effects beyond blur — scroll/spin/zoom/contrast/suck
bake/burn offscreen page model (Decree §6 Render)
Embed resolution ($code → fetch + recursive render)
The ? and ... choice/cycle operators

These land in phases 2–5.