Named freeze scopes for serializable reactive state
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Replace raw CEK state serialization with named freeze scopes.
A freeze scope collects signals registered within it. On freeze,
signal values are serialized to SX. On thaw, values are restored.
- freeze-scope: scoped effect delimiter for signal collection
- freeze-signal: register a signal with a name in the current scope
- cek-freeze-scope / cek-thaw-scope: freeze/thaw by scope name
- freeze-to-sx / thaw-from-sx: full SX text round-trip
- cek-freeze-all / cek-thaw-all: batch operations
Also: register boolean?, symbol?, keyword? predicates in both
Python and JS platforms with proper var aliases.
Demo: counter + name input with Freeze/Thaw buttons.
Frozen SX: {:name "demo" :signals {:count 5 :name "world"}}
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
@@ -542,79 +542,84 @@
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(defisland ~geography/cek/freeze-demo ()
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(let ((source (signal "(+ 1 (* 2 3))"))
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(state-sig (signal nil))
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(step-count (signal 0))
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(frozen-sx (signal ""))
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(thaw-result (signal "")))
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(letrec
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((do-parse (fn ()
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(reset! frozen-sx "")
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(reset! thaw-result "")
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(reset! step-count 0)
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(let ((parsed (sx-parse (deref source))))
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(when (not (empty? parsed))
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(reset! state-sig (make-cek-state (first parsed) (make-env) (list)))))))
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(do-step (fn ()
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(when (and (deref state-sig) (not (cek-terminal? (deref state-sig))))
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(reset! state-sig (cek-step (deref state-sig)))
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(swap! step-count inc))))
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(do-freeze (fn ()
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(when (deref state-sig)
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(let ((frozen (cek-freeze (deref state-sig))))
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(reset! frozen-sx (sx-serialize frozen))))))
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(do-thaw (fn ()
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(when (not (empty? (deref frozen-sx)))
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(let ((parsed (sx-parse (deref frozen-sx))))
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(when (not (empty? parsed))
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(let ((thawed (cek-thaw (first parsed))))
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(reset! thaw-result
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(str "Resumed from step " (deref step-count) ": "
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(cek-run thawed)))))))))
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(do-run (fn ()
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(when (deref state-sig)
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(let run-loop ()
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(when (not (cek-terminal? (deref state-sig)))
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(do-step)
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(run-loop)))))))
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;; Auto-parse
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(effect (fn () (do-parse)))
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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) (do-parse))))
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(let ((bg (signal "violet"))
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(size (signal "text-2xl"))
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(weight (signal "font-bold"))
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(text (signal "the joy of sx"))
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(frozen-text (signal ""))
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(saved (signal (list))))
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;; Register in freeze scope
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(freeze-scope "widget" (fn ()
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(freeze-signal "bg" bg)
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(freeze-signal "size" size)
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(freeze-signal "weight" weight)
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(freeze-signal "text" text)))
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(div :class "space-y-4"
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;; Live preview
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(div :class (str "p-6 rounded-lg text-center transition-all "
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"bg-" (deref bg) "-50 border border-" (deref bg) "-200")
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(span :class (str (deref size) " " (deref weight) " text-" (deref bg) "-700")
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(deref text)))
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;; Controls
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(div :class "grid grid-cols-2 gap-3"
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(div
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(label :class "text-xs text-stone-400 block mb-1" "Colour")
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(div :class "flex gap-1"
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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"
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"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"
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"Run")))
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;; Step count + freeze button
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(div :class "flex items-center gap-3"
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(span :class "text-sm text-stone-500 font-mono"
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"Step " (deref step-count))
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(when (deref state-sig)
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(button :on-click (fn (e) (do-freeze))
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:class "px-3 py-1.5 rounded bg-amber-500 text-white text-sm hover:bg-amber-600"
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"Freeze")))
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;; Frozen SX output
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(when (not (empty? (deref frozen-sx)))
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(div :class "space-y-2"
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(label :class "text-xs text-stone-400 block" "Frozen CEK state")
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(pre :class "text-xs font-mono bg-stone-50 rounded p-3 overflow-x-auto whitespace-pre-wrap text-stone-700"
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(deref frozen-sx))
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(button :on-click (fn (e) (do-thaw))
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:class "px-3 py-1.5 rounded bg-emerald-600 text-white text-sm hover:bg-emerald-700"
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"Thaw \u2192 Resume")))
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;; Thaw result
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(when (not (empty? (deref thaw-result)))
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(div :class "rounded bg-emerald-50 border border-emerald-200 p-3 text-emerald-800 font-mono text-sm"
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(deref thaw-result)))))))
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(for-each (fn (c)
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(button :on-click (fn (e) (reset! bg c))
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:class (str "w-8 h-8 rounded-full bg-" c "-400"
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(if (= (deref bg) c) " ring-2 ring-offset-1 ring-stone-400" ""))
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""))
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(list "violet" "rose" "emerald" "amber" "sky" "stone"))))
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(div
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(label :class "text-xs text-stone-400 block mb-1" "Size")
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(div :class "flex gap-1"
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(for-each (fn (s)
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(button :on-click (fn (e) (reset! size s))
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:class (str "px-2 py-1 rounded text-xs "
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(if (= (deref size) s)
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"bg-stone-700 text-white" "bg-stone-100 text-stone-600"))
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s))
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(list "text-sm" "text-lg" "text-2xl" "text-4xl"))))
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(div
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(label :class "text-xs text-stone-400 block mb-1" "Weight")
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(div :class "flex gap-1"
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(for-each (fn (w)
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(button :on-click (fn (e) (reset! weight w))
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:class (str "px-2 py-1 rounded text-xs "
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(if (= (deref weight) w)
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"bg-stone-700 text-white" "bg-stone-100 text-stone-600"))
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w))
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(list "font-normal" "font-bold" "font-semibold"))))
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(div
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(label :class "text-xs text-stone-400 block mb-1" "Text")
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(input :type "text" :bind text
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:class "w-full px-2 py-1 rounded border border-stone-300 text-sm")))
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;; Freeze / Thaw
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(div :class "flex gap-2 items-center"
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(button :on-click (fn (e)
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(let ((sx (freeze-to-sx "widget")))
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(reset! frozen-text sx)
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(swap! saved (fn (l) (append l (list sx))))))
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:class "px-3 py-1.5 rounded bg-amber-500 text-white text-sm hover:bg-amber-600"
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"Save config")
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(span :class "text-xs text-stone-400"
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(str (len (deref saved)) " saved")))
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;; Saved configs
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(when (not (empty? (deref saved)))
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(div :class "space-y-1"
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(label :class "text-xs text-stone-400 block" "Saved configs")
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(for-each (fn (sx)
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(div :class "flex gap-2 items-center"
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(button :on-click (fn (e) (thaw-from-sx sx))
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:class "flex-1 text-left px-2 py-1 rounded bg-stone-50 hover:bg-stone-100 font-mono text-xs text-stone-600 truncate"
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sx)
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))
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(deref saved))))
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;; Current frozen state
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(when (not (empty? (deref frozen-text)))
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(pre :class "text-xs font-mono bg-stone-50 rounded p-3 overflow-x-auto text-stone-500"
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(deref frozen-text))))))
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;; ---------------------------------------------------------------------------
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