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Unicode escapes, variadic infix fix, spreads demos, scoped-effects + foundations plans

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- Add \uXXXX unicode escape support to parser.py and parser.sx spec
- Add char-from-code primitive (Python chr(), JS String.fromCharCode())
- Fix variadic infix operators in both bootstrappers (js.sx, py.sx) —
  (+ a b c d) was silently dropping terms, now left-folds correctly
- Rebootstrap sx_ref.py and sx-browser.js with all fixes
- Fix 3 pre-existing map-dict test failures in shared/sx/tests/run.py
- Add live demos alongside examples in spreads essay (side-by-side layout)
- Add scoped-effects plan: algebraic effects as unified foundation for
  spread/collect/island/lake/signal/context
- Add foundations plan: CEK machine, the computational floor, three-axis
  model (depth/topology/linearity), Curry-Howard correspondence
- Route both plans in page-functions.sx and nav-data.sx

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
giles
2026-03-13 12:03:58 +00:00
parent 28a6560963
commit 214963ea6a
15 changed files with 1323 additions and 38 deletions
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34
shared/sx/ref/parser.sx
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@@ -80,6 +80,9 @@
;; -- Atom readers --
(define hex-digit-value :effects []
(fn (ch) (index-of "0123456789abcdef" (lower ch))))
(define read-string :effects []
(fn ()
(set! pos (inc pos)) ;; skip opening "
@@ -95,14 +98,29 @@
(= ch "\\")
(do (set! pos (inc pos))
(let ((esc (nth source pos)))
(set! buf (str buf
(cond
(= esc "n") "\n"
(= esc "t") "\t"
(= esc "r") "\r"
:else esc)))
(set! pos (inc pos))
(read-str-loop)))
(if (= esc "u")
;; Unicode escape: \uXXXX → char
(do (set! pos (inc pos))
(let ((d0 (hex-digit-value (nth source pos)))
(_ (set! pos (inc pos)))
(d1 (hex-digit-value (nth source pos)))
(_ (set! pos (inc pos)))
(d2 (hex-digit-value (nth source pos)))
(_ (set! pos (inc pos)))
(d3 (hex-digit-value (nth source pos)))
(_ (set! pos (inc pos))))
(set! buf (str buf (char-from-code
(+ (* d0 4096) (* d1 256) (* d2 16) d3))))
(read-str-loop)))
;; Standard escapes: \n \t \r or literal
(do (set! buf (str buf
(cond
(= esc "n") "\n"
(= esc "t") "\t"
(= esc "r") "\r"
:else esc)))
(set! pos (inc pos))
(read-str-loop)))))
:else
(do (set! buf (str buf ch))
(set! pos (inc pos))