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flow: bounded iteration combinators flow-while/flow-until + 6 tests
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(flow-while pred body max) / (flow-until pred body max) re-run body threading the
value while/until pred holds, capped at max steps for a deterministic bound (no
unbounded loops in pure SX). 122/122 across 7 suites.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
giles
2026-06-06 18:02:59 +00:00
parent 0e6ba55647
commit 0a1b89c975
5 changed files with 45 additions and 9 deletions
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5
lib/flow/spec.sx
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@@ -11,6 +11,9 @@
;; defflow both binds the flow and registers it by name (flow-register!, in
;; store.sx) so it can be re-resolved after a process restart.
;; map-flow (Phase 5): run a node over each item of a list input, join results.
;; flow-while / flow-until (Phase 5): bounded iteration — re-run body, threading
;; the value, while/until pred holds, up to `max` steps (deterministic bound; no
;; unbounded loops in pure SX).
;;
;; Phase 2 combinators (flow-control-src):
;; branch / fail / failed? / fail-reason / try-catch / retry / timeout / tick
@@ -35,7 +38,7 @@
(define
flow-combinators-src
"(define (flow-node f) f)\n (define (flow-id input) input)\n (define (flow-const v) (lambda (input) v))\n (define (flow-seq-step ns v)\n (if (null? ns) v (flow-seq-step (cdr ns) ((car ns) v))))\n (define sequence (lambda ns (lambda (input) (flow-seq-step ns input))))\n (define parallel (lambda ns (lambda (input) (map (lambda (n) (n input)) ns))))\n (define (map-flow node) (lambda (items) (map node items)))\n (define-syntax defflow\n (syntax-rules ()\n ((defflow nm body)\n (begin (define nm body) (flow-register! (quote nm) nm)))))")
"(define (flow-node f) f)\n (define (flow-id input) input)\n (define (flow-const v) (lambda (input) v))\n (define (flow-seq-step ns v)\n (if (null? ns) v (flow-seq-step (cdr ns) ((car ns) v))))\n (define sequence (lambda ns (lambda (input) (flow-seq-step ns input))))\n (define parallel (lambda ns (lambda (input) (map (lambda (n) (n input)) ns))))\n (define (map-flow node) (lambda (items) (map node items)))\n (define (flow-while-step pred body input n)\n (if (<= n 0)\n input\n (if (pred input) (flow-while-step pred body (body input) (- n 1)) input)))\n (define (flow-while pred body max) (lambda (input) (flow-while-step pred body input max)))\n (define (flow-until-step pred body input n)\n (if (<= n 0)\n input\n (if (pred input) input (flow-until-step pred body (body input) (- n 1)))))\n (define (flow-until pred body max) (lambda (input) (flow-until-step pred body input max)))\n (define-syntax defflow\n (syntax-rules ()\n ((defflow nm body)\n (begin (define nm body) (flow-register! (quote nm) nm)))))")
(define
flow-control-src