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(try-catch node handler) runs node; on a raised exception calls (handler error) with the reified error via Scheme guard, returns the handler value. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
112 lines
4.3 KiB
Plaintext
112 lines
4.3 KiB
Plaintext
;; lib/flow/tests/control.sx — Phase 2: control flow + error handling.
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(define flow-ctl-pass 0)
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(define flow-ctl-fail 0)
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(define flow-ctl-fails (list))
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(define
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flow-ctl-test
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(fn
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(name actual expected)
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(if
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(= actual expected)
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(set! flow-ctl-pass (+ flow-ctl-pass 1))
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(begin
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(set! flow-ctl-fail (+ flow-ctl-fail 1))
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(append! flow-ctl-fails {:name name :expected expected :actual actual})))))
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(define flow-c (fn (src) (flow-run src)))
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(define flow-cs (fn (src) (get (flow-run src) :scm-string)))
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;; ── branch ──────────────────────────────────────────────────────
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(flow-ctl-test
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"branch: true selects then"
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(flow-c
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"(flow/start (branch (lambda (x) (> x 0)) (lambda (x) (* x 100)) (lambda (x) (- 0 x))) 5)")
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500)
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(flow-ctl-test
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"branch: false selects else"
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(flow-c
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"(flow/start (branch (lambda (x) (> x 0)) (lambda (x) (* x 100)) (lambda (x) (- 0 x))) -3)")
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3)
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(flow-ctl-test
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"branch: predicate sees the threaded input"
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(flow-c
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"(flow/start (sequence (lambda (x) (+ x 1)) (branch (lambda (x) (> x 3)) (flow-const 100) (flow-const 0))) 3)")
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100)
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(flow-ctl-test
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"branch: branches are full nodes (sequence inside)"
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(flow-c
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"(flow/start (branch (lambda (x) (< x 10)) (sequence (lambda (x) (+ x 1)) (lambda (x) (* x 2))) (flow-const 0)) 4)")
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10)
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(flow-ctl-test
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"branch: nested branch (3-way sign)"
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(flow-c
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"(defflow sign (branch (lambda (x) (> x 0)) (flow-const 1) (branch (lambda (x) (< x 0)) (flow-const -1) (flow-const 0)))) (list (flow/start sign 7) (flow/start sign -7) (flow/start sign 0))")
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(list 1 -1 0))
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(flow-ctl-test
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"branch: publish-shaped approval gate"
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(flow-cs
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"(defflow publish (branch (lambda (post) (>= (string-length post) 3)) (lambda (post) (string-append post \" [published]\")) (lambda (post) (string-append post \" [rejected]\")))) (flow/start publish \"ok\")")
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"ok [rejected]")
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;; ── error model — explicit (fail reason) values ─────────────────
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(flow-ctl-test
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"fail: failed? is true for a failure value"
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(flow-c "(failed? (fail 404))")
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true)
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(flow-ctl-test
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"fail: fail-reason extracts the reason"
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(flow-c "(fail-reason (fail 404))")
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404)
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(flow-ctl-test
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"fail: failed? is false for a plain value"
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(flow-c "(failed? 7)")
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false)
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(flow-ctl-test
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"fail: failed? is false for an ordinary list"
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(flow-c "(failed? (list 1 2 3))")
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false)
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(flow-ctl-test
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"fail: a node may emit a failure as data"
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(flow-c
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"(defflow validate (lambda (s) (if (>= (string-length s) 3) s (fail (quote too-short))))) (failed? (flow/start validate \"hi\"))")
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true)
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(flow-ctl-test
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"fail: failure flows downstream, branch recovers"
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(flow-c
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"(defflow guarded (sequence (lambda (s) (if (>= (string-length s) 3) (string-length s) (fail (quote too-short)))) (branch failed? (lambda (f) (list (quote recovered) (fail-reason f))) (lambda (n) (list (quote ok) n))))) (flow/start guarded \"hi\")")
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(list "recovered" "too-short"))
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;; ── try-catch — reify raised exceptions ─────────────────────────
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(flow-ctl-test
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"try-catch: no exception returns node result"
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(flow-c "(flow/start (try-catch (lambda (x) (* x 2)) (lambda (e) -1)) 5)")
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10)
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(flow-ctl-test
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"try-catch: handler runs on raise"
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(flow-c
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"(flow/start (try-catch (lambda (x) (raise (quote boom))) (flow-const 99)) 1)")
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99)
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(flow-ctl-test
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"try-catch: handler receives the reified error"
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(flow-c "(flow/start (try-catch (lambda (x) (raise 42)) (lambda (e) e)) 0)")
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42)
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(flow-ctl-test
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"try-catch: catches exception from deep inside a sequence"
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(flow-c
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"(flow/start (try-catch (sequence (lambda (x) (+ x 1)) (lambda (x) (raise (quote deep)))) (flow-const -99)) 5)")
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-99)
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(flow-ctl-test
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"try-catch: handler may convert to a failure value"
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(flow-c
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"(failed? (flow/start (try-catch (lambda (x) (raise (quote bad))) (lambda (e) (fail e))) 0))")
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true)
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(flow-ctl-test
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"try-catch: composes — recover then continue"
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(flow-c
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"(flow/start (sequence (try-catch (lambda (x) (raise (quote x))) (flow-const 10)) (lambda (n) (* n 5))) 0)")
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50)
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(define flow-ctl-tests-run! (fn () {:total (+ flow-ctl-pass flow-ctl-fail) :passed flow-ctl-pass :failed flow-ctl-fail :fails flow-ctl-fails}))
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