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A defisland that lets users type an SX expression, step through CEK evaluation one transition at a time, and see C/E/K registers update live. Demonstrates that cek-step is pure data->data. - cek.sx geography: add ~geography/cek/demo-stepper island with source input, step/run/reset buttons, state display, step history - platform_js.py: register CEK stepping primitives (make-cek-state, cek-step, cek-terminal?, cek-value, make-env, sx-serialize) so island code can access them Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
454 lines
23 KiB
Plaintext
454 lines
23 KiB
Plaintext
;; ---------------------------------------------------------------------------
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;; CEK Machine — Geography section
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;; ---------------------------------------------------------------------------
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;; ---------------------------------------------------------------------------
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;; Island demos
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;; ---------------------------------------------------------------------------
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;; Counter: signal + deref in text position
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(defisland ~geography/cek/demo-counter (&key initial)
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(let ((count (signal (or initial 0)))
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(doubled (computed (fn () (* 2 (deref count))))))
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(div :class "rounded-lg border border-stone-200 p-4 space-y-2"
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(div :class "flex items-center gap-3"
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(button :class "px-3 py-1 rounded bg-violet-600 text-white text-sm"
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:on-click (fn (e) (swap! count dec)) "-")
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(span :class "text-2xl font-bold text-violet-700 min-w-[3ch] text-center"
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(deref count))
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(button :class "px-3 py-1 rounded bg-violet-600 text-white text-sm"
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:on-click (fn (e) (swap! count inc)) "+"))
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(p :class "text-sm text-stone-500"
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(str "doubled: " (deref doubled))))))
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;; Computed chain: base -> doubled -> quadrupled
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(defisland ~geography/cek/demo-chain ()
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(let ((base (signal 1))
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(doubled (computed (fn () (* (deref base) 2))))
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(quadrupled (computed (fn () (* (deref doubled) 2)))))
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(div :class "rounded-lg border border-stone-200 p-4 space-y-2"
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(div :class "flex items-center gap-3"
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(button :class "px-3 py-1 rounded bg-violet-600 text-white text-sm"
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:on-click (fn (e) (swap! base dec)) "-")
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(span :class "text-2xl font-bold text-violet-700 min-w-[3ch] text-center"
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(deref base))
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(button :class "px-3 py-1 rounded bg-violet-600 text-white text-sm"
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:on-click (fn (e) (swap! base inc)) "+"))
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(p :class "text-sm text-stone-500"
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(str "doubled: " (deref doubled) " | quadrupled: " (deref quadrupled))))))
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;; Reactive attribute: (deref sig) in :class position
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(defisland ~geography/cek/demo-reactive-attr ()
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(let ((danger (signal false)))
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(div :class "rounded-lg border border-stone-200 p-4 space-y-3"
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(button :class "px-3 py-1 rounded bg-violet-600 text-white text-sm"
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:on-click (fn (e) (swap! danger not))
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(if (deref danger) "Safe mode" "Danger mode"))
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(div :class (str "p-3 rounded font-medium transition-colors "
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(if (deref danger)
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"bg-red-100 text-red-800"
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"bg-green-100 text-green-800"))
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(if (deref danger)
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"DANGER: reactive class binding via CEK"
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"SAFE: reactive class binding via CEK")))))
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;; Stopwatch: effect + cleanup
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(defisland ~geography/cek/demo-stopwatch ()
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(let ((running (signal false))
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(elapsed (signal 0))
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(time-text (create-text-node "0.0s"))
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(btn-text (create-text-node "Start")))
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(effect (fn ()
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(when (deref running)
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(let ((id (set-interval (fn () (swap! elapsed inc)) 100)))
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(fn () (clear-interval id))))))
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(effect (fn ()
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(let ((e (deref elapsed)))
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(dom-set-text-content time-text
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(str (floor (/ e 10)) "." (mod e 10) "s")))))
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(effect (fn ()
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(dom-set-text-content btn-text
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(if (deref running) "Stop" "Start"))))
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(div :class "rounded-lg border border-stone-200 p-4"
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(div :class "flex items-center gap-3"
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(span :class "text-2xl font-bold text-violet-700 font-mono min-w-[5ch]" time-text)
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(button :class "px-3 py-1 rounded bg-violet-600 text-white text-sm"
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:on-click (fn (e) (swap! running not)) btn-text)
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(button :class "px-3 py-1 rounded bg-stone-400 text-white text-sm"
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:on-click (fn (e) (reset! running false) (reset! elapsed 0)) "Reset")))))
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;; Batch: two signals, one notification
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(defisland ~geography/cek/demo-batch ()
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(let ((first-sig (signal 0))
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(second-sig (signal 0))
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(renders (signal 0)))
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(effect (fn ()
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(deref first-sig) (deref second-sig)
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(swap! renders inc)))
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(div :class "rounded-lg border border-stone-200 p-4 space-y-2"
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(div :class "flex items-center gap-4 text-sm"
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(span (str "first: " (deref first-sig)))
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(span (str "second: " (deref second-sig)))
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(span :class "px-2 py-0.5 rounded bg-green-100 text-green-800 text-xs font-semibold"
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(str "renders: " (deref renders))))
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(div :class "flex items-center gap-2"
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(button :class "px-3 py-1 rounded bg-violet-600 text-white text-sm"
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:on-click (fn (e)
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(batch (fn ()
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(swap! first-sig inc)
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(swap! second-sig inc))))
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"Batch +1")
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(button :class "px-3 py-1 rounded bg-stone-400 text-white text-sm"
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:on-click (fn (e)
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(swap! first-sig inc)
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(swap! second-sig inc))
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"No-batch +1")))))
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;; ---------------------------------------------------------------------------
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;; Overview page content
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;; ---------------------------------------------------------------------------
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(defcomp ~geography/cek/cek-content ()
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(~docs/page :title "CEK Machine"
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(~docs/section :title "Three registers" :id "registers"
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(p "The CEK machine makes evaluation explicit. Every step is a pure function from state to state:")
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(ul :class "space-y-1 text-stone-600 list-disc pl-5"
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(li (strong "C") "ontrol — the expression being evaluated")
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(li (strong "E") "nvironment — the bindings in scope")
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(li (strong "K") "ontinuation — what to do with the result"))
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(p "The tree-walk evaluator uses the same three things, but hides them in the call stack. The CEK makes them " (em "data") " — inspectable, serializable, capturable."))
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(~docs/section :title "Why it matters" :id "why"
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(p "Making the continuation explicit enables:")
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(ul :class "space-y-1 text-stone-600 list-disc pl-5"
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(li (strong "Stepping") " — pause evaluation, inspect state, resume")
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(li (strong "Serialization") " — save a computation mid-flight, restore later")
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(li (strong "Delimited continuations") " — " (code "shift") "/" (code "reset") " capture \"the rest of this expression\" as a value")
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(li (strong "Deref-as-shift") " — " (code "(deref sig)") " inside a reactive boundary captures the continuation as the subscriber")))
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(~docs/section :title "Default evaluator" :id "default"
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(p "CEK is the default evaluator on both client (JS) and server (Python). Every " (code "eval-expr") " call goes through " (code "cek-run") ". The tree-walk evaluator is preserved as " (code "_tree_walk_eval_expr") " for test runners that interpret " (code ".sx") " files.")
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(p "The CEK is defined in two spec files:")
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(ul :class "space-y-1 text-stone-600 list-disc pl-5"
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(li (code "frames.sx") " — frame types (IfFrame, ArgFrame, ResetFrame, ReactiveResetFrame, ...)")
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(li (code "cek.sx") " — step function, run loop, special form handlers, continuation operations")))
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(~docs/section :title "Deref as shift" :id "deref-as-shift"
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(p "The reactive payoff. When " (code "(deref sig)") " encounters a signal inside a " (code "reactive-reset") " boundary:")
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(ol :class "space-y-1 text-stone-600 list-decimal pl-5"
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(li (strong "Shift") " — capture all frames between here and the reactive-reset")
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(li (strong "Subscribe") " — register the captured continuation as a signal subscriber")
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(li (strong "Return") " — flow the current signal value through the rest of the expression"))
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(p "When the signal changes, the captured continuation is re-invoked with the new value. The " (code "update-fn") " on the ReactiveResetFrame mutates the DOM. No explicit " (code "effect()") " wrapping needed.")
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(~docs/code :code (highlight
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";; User writes:\n(div :class (str \"count-\" (deref counter))\n (str \"Value: \" (deref counter)))\n\n;; CEK sees (deref counter) → signal? → reactive-reset on stack?\n;; Yes: capture (str \"count-\" [HOLE]) as continuation\n;; Register as subscriber. Return current value.\n;; When counter changes: re-invoke continuation → update DOM."
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"lisp")))))
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;; ---------------------------------------------------------------------------
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;; CEK stepper: interactive stepping debugger
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;; ---------------------------------------------------------------------------
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(defisland ~geography/cek/demo-stepper (&key initial-expr)
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(let ((source (signal (or initial-expr "(+ 1 (* 2 3))")))
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(state (signal nil))
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(steps (signal 0))
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(history (signal (list)))
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(error-msg (signal nil)))
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;; Parse and create initial CEK state
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(define start-eval
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(fn ()
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(reset! error-msg nil)
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(reset! history (list))
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(reset! steps 0)
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(let ((parsed (sx-parse (deref source))))
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(if (empty? parsed)
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(reset! error-msg "Parse error: empty expression")
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(reset! state (make-cek-state (first parsed) (make-env) (list)))))))
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;; Single step
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(define do-step
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(fn ()
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(when (and (deref state) (not (cek-terminal? (deref state))))
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(let ((prev (deref state)))
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(swap! history (fn (h) (append h (list prev))))
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(swap! steps inc)
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(reset! state (cek-step prev))))))
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;; Run to completion
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(define do-run
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(fn ()
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(when (deref state)
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(let run-loop ((n 0))
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(when (and (not (cek-terminal? (deref state))) (< n 200))
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(do-step)
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(run-loop (+ n 1)))))))
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;; Reset
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(define do-reset
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(fn ()
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(reset! state nil)
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(reset! steps 0)
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(reset! history (list))
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(reset! error-msg nil)))
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;; Format control for display
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(define fmt-control
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(fn (s)
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(if (nil? s) "\u2014"
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(let ((c (get s "control")))
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(if (nil? c) "\u2014"
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(sx-serialize c))))))
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;; Format value
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(define fmt-value
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(fn (s)
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(if (nil? s) "\u2014"
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(let ((v (get s "value")))
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(cond
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(nil? v) "nil"
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(callable? v) (str "\u03bb:" (or (lambda-name v) "fn"))
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:else (sx-serialize v))))))
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;; Format kont
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(define fmt-kont
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(fn (s)
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(if (nil? s) "\u2014"
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(let ((k (get s "kont")))
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(if (empty? k) "[]"
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(str "[" (join " " (map (fn (f) (get f "type")) k)) "]"))))))
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;; Initialize on first render
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(start-eval)
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(div :class "space-y-4"
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;; Input
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(div :class "flex gap-2 items-end"
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(div :class "flex-1"
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(label :class "text-xs text-stone-400 block mb-1" "Expression")
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(input :type "text" :bind source
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:class "w-full px-3 py-1.5 rounded border border-stone-300 font-mono text-sm focus:outline-none focus:border-violet-400"
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:on-change (fn (e) (start-eval))))
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(div :class "flex gap-1"
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(button :on-click (fn (e) (start-eval))
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:class "px-3 py-1.5 rounded bg-stone-200 text-stone-700 text-sm hover:bg-stone-300" "Reset")
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(button :on-click (fn (e) (do-step))
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:class "px-3 py-1.5 rounded bg-violet-500 text-white text-sm hover:bg-violet-600" "Step")
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(button :on-click (fn (e) (do-run))
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:class "px-3 py-1.5 rounded bg-violet-700 text-white text-sm hover:bg-violet-800" "Run")))
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;; Error
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(when (deref error-msg)
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(div :class "text-red-600 text-sm" (deref error-msg)))
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;; Current state
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(when (deref state)
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(div :class "rounded border border-stone-200 bg-white p-3 font-mono text-sm space-y-1"
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(div :class "flex gap-4"
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(span :class "text-stone-400 w-16" "Step")
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(span :class "font-bold" (deref steps)))
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(div :class "flex gap-4"
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(span :class "text-stone-400 w-16" "Phase")
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(span :class (str "font-bold " (if (= (get (deref state) "phase") "eval") "text-blue-600" "text-green-600"))
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(get (deref state) "phase")))
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(div :class "flex gap-4"
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(span :class "text-violet-500 w-16" "C")
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(span (fmt-control (deref state))))
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(div :class "flex gap-4"
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(span :class "text-amber-600 w-16" "V")
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(span (fmt-value (deref state))))
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(div :class "flex gap-4"
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(span :class "text-emerald-600 w-16" "K")
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(span (fmt-kont (deref state))))
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(when (cek-terminal? (deref state))
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(div :class "mt-2 pt-2 border-t border-stone-200 text-stone-800 font-bold"
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(str "Result: " (sx-serialize (cek-value (deref state))))))))
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;; Step history
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(when (not (empty? (deref history)))
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(div :class "rounded border border-stone-100 bg-stone-50 p-2"
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(div :class "text-xs text-stone-400 mb-1" "History")
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(div :class "space-y-0.5 font-mono text-xs max-h-48 overflow-y-auto"
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(map-indexed (fn (i s)
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(div :class "flex gap-2 text-stone-500"
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(span :class "text-stone-300 w-6 text-right" (+ i 1))
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(span :class (if (= (get s "phase") "eval") "text-blue-400" "text-green-400") (get s "phase"))
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(span :class "text-violet-400 truncate" (fmt-control s))
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(span :class "text-amber-400" (fmt-value s))
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(span :class "text-emerald-400" (fmt-kont s))))
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(deref history))))))))
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;; ---------------------------------------------------------------------------
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;; Render stepper: watch a component render itself, tag by tag
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;;
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;; Walks the SX AST depth-first. At each step, renders ONE subtree
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;; via render-to-html and appends to the accumulating output.
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;; The preview pane shows partial HTML building up.
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;; ---------------------------------------------------------------------------
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(defisland ~geography/cek/demo-render-stepper (&key initial-expr)
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(let ((source (signal (or initial-expr
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"(div :class \"p-4 rounded border border-violet-200 bg-violet-50\"\n (h2 :class \"font-bold text-violet-800\" \"Hello from CEK\")\n (p :class \"text-stone-600\" (str \"2+3 = \" (+ 2 3))))")))
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(steps (signal (list)))
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(preview (signal ""))
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(step-idx (signal 0))
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(error-msg (signal nil)))
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(div :class "space-y-4"
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(div
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(label :class "text-xs text-stone-400 block mb-1" "Component expression")
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(textarea :bind source :rows 4
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:class "w-full px-3 py-2 rounded border border-stone-300 font-mono text-xs focus:outline-none focus:border-violet-400"))
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(div :class "flex gap-1"
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(button :on-click (fn (e)
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;; Parse and build step list
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(reset! error-msg nil)
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(reset! preview "")
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(reset! step-idx 0)
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(let ((parsed (sx-parse (deref source))))
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(if (empty? parsed)
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(do (reset! error-msg "Parse error") (reset! steps (list)))
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(let ((expr (first parsed)))
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;; If root is an HTML tag, split into per-child steps
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(if (and (list? expr) (not (empty? expr))
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(= (type-of (first expr)) "symbol")
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(is-html-tag? (symbol-name (first expr))))
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;; Split: open tag, each child, close tag
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(let ((tag (symbol-name (first expr)))
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(args (rest expr))
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(children (list))
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(attrs (list))
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(in-kw false)
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(result (list)))
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(for-each (fn (a)
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(cond
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(= (type-of a) "keyword") (do (set! in-kw true) (append! attrs a))
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in-kw (do (set! in-kw false) (append! attrs a))
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:else (do (set! in-kw false) (append! children a))))
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args)
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;; Build attr string
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(let ((attr-parts (list)))
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(let loop ((i 0))
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(when (< i (len attrs))
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(append! attr-parts
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(str " " (keyword-name (nth attrs i)) "=\""
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(nth attrs (+ i 1)) "\""))
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(loop (+ i 2))))
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(let ((attr-str (join "" attr-parts))
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(open-html (str "<" tag attr-str ">")))
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;; Step 1: open tag
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(append! result {"label" (str "<" tag " ...>") "html" open-html})
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;; Steps 2..N-1: each child rendered
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(for-each (fn (child)
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(let ((child-html (render-to-html child (make-env)))
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(child-sx (sx-serialize child)))
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(append! result {"label" child-sx "html" child-html})))
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children)
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;; Step N: close tag
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(append! result {"label" (str "</" tag ">") "html" (str "</" tag ">")})
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(reset! steps result))))
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;; Not a tag — single step
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(let ((html (render-to-html expr (make-env))))
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(reset! steps (list {"label" (sx-serialize expr) "html" html}))))))))
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:class "px-3 py-1.5 rounded bg-stone-200 text-stone-700 text-sm hover:bg-stone-300" "Parse")
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(button :on-click (fn (e)
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;; Step: add next step's HTML to preview
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(when (< (deref step-idx) (len (deref steps)))
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(let ((step (nth (deref steps) (deref step-idx))))
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(swap! preview (fn (p) (str p (get step "html"))))
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(swap! step-idx inc))))
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:class "px-3 py-1.5 rounded bg-violet-500 text-white text-sm hover:bg-violet-600" "Step")
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(button :on-click (fn (e)
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;; Run all remaining steps
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(let loop ()
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(when (< (deref step-idx) (len (deref steps)))
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(let ((step (nth (deref steps) (deref step-idx))))
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(swap! preview (fn (p) (str p (get step "html"))))
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(swap! step-idx inc)
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(loop)))))
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:class "px-3 py-1.5 rounded bg-violet-700 text-white text-sm hover:bg-violet-800" "Run"))
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(when (deref error-msg)
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(div :class "text-red-600 text-sm" (deref error-msg)))
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;; Two-pane
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(div :class "grid grid-cols-1 md:grid-cols-2 gap-4"
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;; Left: step list
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(div :class "rounded border border-stone-200 bg-white p-3 min-h-24"
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(div :class "text-xs text-stone-400 mb-2"
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(str (deref step-idx) " / " (len (deref steps)) " steps"
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(if (and (> (len (deref steps)) 0) (= (deref step-idx) (len (deref steps))))
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" \u2014 complete" "")))
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(div :class "space-y-0.5 font-mono text-xs max-h-64 overflow-y-auto"
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(map-indexed (fn (i step)
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(div :class (str "flex gap-2 px-1 rounded "
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(if (= i (deref step-idx)) "bg-violet-100" "")
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(if (< i (deref step-idx)) " text-stone-400" " text-stone-600"))
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(span :class "text-stone-300 w-4 text-right" (+ i 1))
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(span :class "truncate"
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(let ((lbl (get step "label")))
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(if (> (len lbl) 60) (str (slice lbl 0 57) "...") lbl)))))
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(deref steps))))
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;; Right: live preview
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(div :class "rounded border border-stone-200 bg-white p-3 min-h-24"
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(div :class "text-xs text-stone-400 mb-2" "Live preview")
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(if (empty? (deref preview))
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(div :class "text-stone-300 text-sm italic" "Click Parse then Step...")
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(raw! (deref preview))))))))
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;; ---------------------------------------------------------------------------
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;; Demo page content
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;; ---------------------------------------------------------------------------
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(defcomp ~geography/cek/cek-demo-content ()
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(~docs/page :title "CEK Demo"
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(~docs/section :title "What this demonstrates" :id "what"
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(p "These are " (strong "live islands") " evaluated by the CEK machine. Every " (code "eval-expr") " goes through " (code "cek-run") ". Every " (code "(deref sig)") " in an island creates a reactive DOM binding via continuation frames.")
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(p "The CEK machine is defined in " (code "cek.sx") " and " (code "frames.sx") " — pure s-expressions, bootstrapped to both JavaScript and Python."))
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(~docs/section :title "Stepper" :id "stepper"
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(p "The CEK machine is pure data\u2192data. Each step takes a state dict and returns a new one. "
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"Type an expression, click Step to advance one CEK transition.")
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(~geography/cek/demo-stepper :initial-expr "(let ((x 10)) (+ x (* 2 3)))")
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(~docs/code :code (highlight (component-source "~geography/cek/demo-stepper") "lisp")))
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(~docs/section :title "Render stepper" :id "render-stepper"
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(p "Watch a component render itself. The CEK evaluates the expression — "
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"when it encounters " (code "(div ...)") ", the render adapter produces HTML in one step. "
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"Click Run to see the rendered output appear in the preview.")
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(~geography/cek/demo-render-stepper)
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(~docs/code :code (highlight (component-source "~geography/cek/demo-render-stepper") "lisp")))
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(~docs/section :title "1. Counter" :id "demo-counter"
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(p (code "(deref count)") " in text position creates a reactive text node. " (code "(deref doubled)") " is a computed that updates when count changes.")
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(~geography/cek/demo-counter :initial 0)
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(~docs/code :code (highlight (component-source "~geography/cek/demo-counter") "lisp")))
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|
|
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(~docs/section :title "2. Computed chain" :id "demo-chain"
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(p "Three levels of computed: base -> doubled -> quadrupled. Change base, all propagate.")
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|
(~geography/cek/demo-chain)
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(~docs/code :code (highlight (component-source "~geography/cek/demo-chain") "lisp")))
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|
|
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(~docs/section :title "3. Reactive attributes" :id "demo-attr"
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(p (code "(deref sig)") " in " (code ":class") " position. The CEK evaluates the " (code "str") " expression, and when the signal changes, the continuation re-evaluates and updates the attribute.")
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|
(~geography/cek/demo-reactive-attr)
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|
(~docs/code :code (highlight (component-source "~geography/cek/demo-reactive-attr") "lisp")))
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|
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(~docs/section :title "4. Effect + cleanup" :id "demo-stopwatch"
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(p "Effects still work through CEK. This stopwatch uses " (code "effect") " with cleanup — toggling the signal clears the interval.")
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|
(~geography/cek/demo-stopwatch)
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(~docs/code :code (highlight (component-source "~geography/cek/demo-stopwatch") "lisp")))
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|
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(~docs/section :title "5. Batch coalescing" :id "demo-batch"
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(p "Two signals updated in " (code "batch") " — one notification cycle. Compare render counts between batch and no-batch.")
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(~geography/cek/demo-batch)
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(~docs/code :code (highlight (component-source "~geography/cek/demo-batch") "lisp")))))
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