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Expressions: a kept layer's info is private, so freezing the layer doesn't keep it

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tylerjenningsw
2026-10-29 17:53:50 -04:00
parent 48c9993bd3
commit ffad10c7f3
1 changed files with 10 additions and 8 deletions
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crates/expr/src/prelude.js
+10 -8
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@@ -552,12 +552,18 @@ function Layer(c, l) {
delete f.length;
Object.setPrototypeOf(f, Layer.prototype);
// Kept across evaluations (`__layer`), so an expression can't change which layer it is, delete
// a field or leave its own on it. `__i` and `__s` stay writable: `__info` reads them again in an
// evaluation whose `__S` isn't `__s`, and every evaluation has a new `__S`.
// a field or leave its own on it. Its info is private to `__info`, which reads it again in an
// evaluation whose `__S` isn't the one it was read in (every evaluation has a new `__S`), so
// freezing the layer can't keep its info either.
var info = null, read = null;
Object.defineProperty(f, '__c', { value: c });
Object.defineProperty(f, '__l', { value: l });
Object.defineProperty(f, '__i', { value: null, writable: true });
Object.defineProperty(f, '__s', { value: null, writable: true });
Object.defineProperty(f, '__info', {
get: function () {
if (read !== __S) { info = __h(__LINFO, c, l); read = __S; }
return info;
},
});
Object.preventExtensions(f);
return f;
}
@@ -609,10 +615,6 @@ function __m4(m, p, vec) {
Layer.prototype = {
__isLayer: true,
get __info() {
if (this.__s !== __S) { this.__i = __h(__LINFO, this.__c, this.__l); this.__s = __S; }
return this.__i;
},
get name() { return this.__info[0]; },
get index() { return this.__info[1]; },
get inPoint() { return this.__info[2]; },