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Add live CEK stepper island — interactive stepping debugger
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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>
This commit is contained in:
giles
2026-03-14 13:31:52 +00:00
parent 0047757af8
commit 7ec643ab69
3 changed files with 348 additions and 17 deletions
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17
shared/static/scripts/sx-browser.js
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@@ -14,7 +14,7 @@
// =========================================================================
var NIL = Object.freeze({ _nil: true, toString: function() { return "nil"; } });
var SX_VERSION = "2026-03-14T10:44:25Z";
var SX_VERSION = "2026-03-14T14:12:59Z";
function isNil(x) { return x === NIL || x === null || x === undefined; }
function isSxTruthy(x) { return x !== false && !isNil(x); }
@@ -6547,6 +6547,21 @@ return (function() {
return cekValue(state);
};
// CEK stepping primitives — for debugger islands
PRIMITIVES["make-cek-state"] = makeCekState;
PRIMITIVES["cek-step"] = cekStep;
PRIMITIVES["cek-terminal?"] = cekTerminal_p;
PRIMITIVES["cek-value"] = cekValue;
PRIMITIVES["make-env"] = function() { return merge(PRIMITIVES); };
PRIMITIVES["sx-serialize"] = sxSerialize;
PRIMITIVES["lambda-name"] = lambdaName;
PRIMITIVES["callable?"] = isCallable;
PRIMITIVES["is-html-tag?"] = function(name) { return HTML_TAGS.indexOf(name) >= 0; };
PRIMITIVES["make-symbol"] = function(name) { return new Symbol(name); };
PRIMITIVES["keyword-name"] = keywordName;
PRIMITIVES["type-of"] = typeOf;
PRIMITIVES["symbol-name"] = symbolName;
// =========================================================================
// Async IO: Promise-aware rendering for client-side IO primitives