MONADS
This commit is contained in:
Sam Caldwell
parent
5544052488
commit
da1f9d4b6d
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@ -184,11 +184,50 @@
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(define (make-store . vs)
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(make-immutable-hash vs))
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;; A (Continue A) is (continue A σ (Listof Action) (Listof FacetTree))
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(struct continue (v sto as fs) #:transparent)
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;; A Stop is (stop σ (Listof Action))
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(struct stop (sto as) #:transparent)
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;; A (Result A) is a Stop or (Continue A)
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;; result-bind : Result (Any σ Any ... -> Result) Any ... -> Result
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(define (result-bind r f . extra-args)
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(match r
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[(continue v σ as fs)
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(match (apply f (cons v (cons σ extra-args)))
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[(continue next-v next-σ more-as more-fs)
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(continue next-v next-σ (append as more-as) (append fs more-fs))]
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[s s])]
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[s s]))
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;; result-map : (Result A) (A -> B) -> (Result B)
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(define (result-map f r)
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(match r
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[(continue v σ as fs)
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(continue (f v) σ as fs)]
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[s s]))
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;; sequence-steps : Any σ (Listof (Any σ -> Result)) -> Result
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(define (sequence-steps v σ steps)
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(for/fold ([r (inj-result v σ)])
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([s (in-list steps)])
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(result-bind r s)))
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;; inj-result : A σ -> (Continue A)
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(define (inj-result v σ)
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(continue v σ (list) (list)))
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;; for-steps : A σ (Sequenceof B) (A σ B -> (Result A)) -> (Result A)
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(define (for-steps v σ seq f)
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(for/fold ([r (inj-result v σ)])
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([x seq])
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(result-bind r f x)))
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;; boot-facet : facet Γ σ -> (Values σ (Listof Action) FacetTree)
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(define (boot-facet f Γ σ)
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(define initial-sto (initial-store f Γ σ))
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(match-define-values ((store-concat parent-sto facet-sto) as fs)
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(eval-start-actions f Γ (store-concat σ initial-sto)))
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(match-define (continue _ (store-concat parent-sto facet-sto) as fs)
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(eval-start-actions f Γ (store-concat σ initial-sto)))
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(values parent-sto as (facet-tree f Γ facet-sto fs)))
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;; initial-store : facet Γ σ -> σ
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@ -197,26 +236,24 @@
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(match-define `(react ,O ...) f)
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(define locations
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(for/fold ([locations (list)])
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([o (in-list O)])
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(match o
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[`(field ,id ,exp)
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(define-values (v s as fs) (eval-exp exp Γ σ))
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(cons (cons id v) locations)]
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[_ locations])))
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([o (in-list O)])
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(match o
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[`(field ,id ,exp)
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(match-define (continue v _ _ _) (eval-exp exp Γ σ))
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(cons (cons id v) locations)]
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[_ locations])))
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(apply make-store locations))
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;; eval-start-actions : facet Γ σ -> (Values σ (Listof Action) (Listof FacetTree))
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;; eval-start-actions : facet Γ σ -> (Continue #f)
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(define (eval-start-actions f Γ σ)
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(match-define `(react ,O ...) f)
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(for/fold ([sto σ]
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[as (list)]
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[facets (list)])
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([o (in-list O)])
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(match o
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[`(on-start ,exp ...)
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(define-values (new-sto more-as more-facets) (eval-exp* exp Γ σ))
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(values new-sto (append as more-as) (append facets more-facets))]
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[_ (values sto as facets)])))
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(for-steps #f σ (in-list O)
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(lambda (_ σ o)
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(match o
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[`(on-start ,exp ...)
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(eval-exp* exp Γ σ)]
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[_
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(inj-result #f σ)]))))
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;; boot-actor : actor Γ -> Action
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(define (boot-actor a Γ)
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@ -232,151 +269,129 @@
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(boot-actor a Γ)))
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(spawn-dataspace boot-actions)]))
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;; eval-exp : exp Γ σ -> (Values val σ (Listof Action) (Listof FacetTree))
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;; eval-exp : exp Γ σ -> (Continue val)
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(define (eval-exp e Γ σ)
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(match e
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[`(react ,O ...)
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(define-values (new-sto as ft) (boot-facet e Γ σ))
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(values (void) new-sto as (list ft))]
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(continue (void) new-sto as (list ft))]
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[`(actor ,_)
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;; don't pass in parent store
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(define spawn-action (boot-actor e Γ))
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(values (void) σ (list spawn-action) (list))]
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(continue (void) σ (list spawn-action) (list))]
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[`(dataspace ,actors ...)
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(values (void) σ (list (boot-actor e Γ)) (list))]
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(continue (void) σ (list (boot-actor e Γ)) (list))]
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[`(outbound ,exp)
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(define-values (v new-sto as facets) (eval-exp exp Γ σ))
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(values (outbound v) σ as facets)]
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(match-define (continue v new-sto as facets) (eval-exp exp Γ σ))
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(continue (outbound v) σ as facets)]
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[`(inbound ,exp)
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(define-values (v new-sto as facets) (eval-exp exp Γ σ))
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(values (inbound v) σ as facets)]
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(match-define (continue v new-sto as facets) (eval-exp exp Γ σ))
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(continue (inbound v) σ as facets)]
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[(? symbol? id)
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(let ([v (env-lookup Γ id)])
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(values v σ (list) (list)))]
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(continue v σ (list) (list)))]
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[`(lambda (,vars ...) ,exp)
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(define c (closure Γ e))
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(values c σ (list) (list))]
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(continue c σ (list) (list))]
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[`(begin ,es ...)
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(for/fold ([v (void)]
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[σ σ]
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[as (list)]
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[facets (list)])
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([e (in-list es)])
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(define-values (v new-sto more-as more-facets) (eval-exp e Γ σ))
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(values v new-sto (append as more-as) (append facets more-facets)))]
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(for-steps (void) σ (in-list es)
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(lambda (v σ e) (eval-exp e Γ σ)))]
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[`(list ,es ...)
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(define-values (rev-vs new-sto as facets)
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(for/fold ([rev-vs (list)]
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[σ σ]
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[as (list)]
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[facets (list)])
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([e (in-list es)])
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(define-values (v new-sto more-as more-facets) (eval-exp e Γ σ))
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(values (cons v rev-vs) new-sto (append as more-as) (append facets more-facets))))
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(values (cons 'list (reverse rev-vs)) new-sto as facets)]
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(define res (for-steps (list) σ (in-list es)
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(lambda (rev-vs σ e)
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(result-map (lambda (v) (cons v rev-vs))
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(eval-exp e Γ σ)))))
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(result-map (lambda (rev-vs) (cons 'list (reverse rev-vs)))
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res)]
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[`(let (,x ,exp) ,body-exp)
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(define-values (v new-sto as facets) (eval-exp exp Γ σ))
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(define new-Γ (extend-env Γ x v))
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(define-values (result-v final-sto more-as more-facets) (eval-exp body-exp new-Γ new-sto))
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(values result-v final-sto (append as more-as) (append facets more-facets))]
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(result-bind (eval-exp exp Γ σ)
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(lambda (v new-sto)
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(define new-Γ (extend-env Γ x v))
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(eval-exp body-exp new-Γ new-sto)))]
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[`(if ,pred-exp ,then-exp ,else-exp)
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(define-values (pred-v pred-sto as facets) (eval-exp pred-exp Γ σ))
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(define-values (result-v final-sto more-as more-facets)
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(if pred-v
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(eval-exp then-exp Γ pred-sto)
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(eval-exp else-exp Γ pred-sto)))
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(values result-v final-sto (append as more-as) (append facets more-facets))]
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(result-bind (eval-exp pred-exp Γ σ)
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(lambda (v new-sto)
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(if v
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(eval-exp then-exp Γ new-sto)
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(eval-exp else-exp Γ new-sto))))]
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[`(send! ,exp)
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(define-values (v new-sto as facets) (eval-exp exp Γ σ))
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(values (void) new-sto (append as (list (message v))) facets)]
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(match-define (continue v new-sto as facets) (eval-exp exp Γ σ))
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(continue (void) new-sto (append as (list (message v))) facets)]
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[`(set! ,id ,exp)
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(define-values (v new-sto as facets) (eval-exp exp Γ σ))
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(match-define (continue v new-sto as facets) (eval-exp exp Γ σ))
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(define result-sto (update-sto new-sto id v))
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(values (void) result-sto as facets)]
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(continue (void) result-sto as facets)]
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[`(read ,id)
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(define v (sto-fetch σ id))
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(values v σ (list) (list))]
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(continue v σ (list) (list))]
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[`(,primop ,exp ..1)
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#:when (primop? primop)
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(define-values (args sto as facets)
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(for/fold ([vs (list)]
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[σ σ]
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[as (list)]
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[facets (list)])
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([e (in-list exp)])
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(define-values (v new-sto more-as more-facets) (eval-exp e Γ σ))
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(values (cons v vs) new-sto (append as more-as) (append facets more-facets))))
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(define v (apply-primop primop (reverse args)))
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(values v sto as facets)]
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(result-bind (eval-exp* exp Γ σ)
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(lambda (arg-vs new-sto)
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(inj-result (apply-primop primop arg-vs) σ)))]
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[`(,f-exp ,exps ...)
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(define-values (clo f-σ f-as f-fs) (eval-exp f-exp Γ σ))
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(unless (closure? clo) (error 'eval-exp "tried to apply non-function ~v" clo))
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(define-values (rev-args sto as facets)
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(for/fold ([rev-vs (list)]
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[σ f-σ]
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[as f-as]
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[facets f-fs])
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([e (in-list exps)])
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(define-values (v new-sto more-as more-facets) (eval-exp e Γ σ))
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(values (cons v rev-vs) new-sto (append as more-as) (append facets more-facets))))
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(match-define (closure clo-env `(lambda (,vars ...) ,body-exp)) clo)
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(unless (= (length rev-args) (length vars))
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(error 'eval-exp "wrong number of arguments; expected ~v, got ~v" (length vars) (length rev-args)))
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(define new-env (append (map binding vars (reverse rev-args)) clo-env))
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(define-values (v final-sto even-more-as even-more-fs) (eval-exp body-exp new-env sto))
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(values v final-sto (append as even-more-as) (append facets even-more-fs))]
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[x (values x σ (list) (list))]))
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(result-bind (eval-exp f-exp Γ σ)
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(lambda (f-v new-sto)
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(unless (closure? f-v) (error 'eval-exp "tried to apply non-function ~v" f-v))
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(result-bind (eval-exp* exps Γ σ)
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(lambda (arg-vs final-sto)
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(match-define (closure clo-env `(lambda (,vars ...) ,body-exp)) f-v)
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(unless (= (length arg-vs) (length vars))
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(error 'eval-exp "wrong number of arguments; expected ~v, got ~v" (length vars) (length arg-vs)))
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(define new-env (append (map binding vars arg-vs) clo-env))
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(eval-exp body-exp new-env final-sto)))))]
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[x (continue x σ (list) (list))]))
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(module+ test
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;; sequencing result
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(let-values ([(v s as f) (eval-exp `(begin 1 2 3) mt-Γ mt-σ)])
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(match-let ([(continue v s as f) (eval-exp `(begin 1 2 3) mt-Γ mt-σ)])
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(check-equal? v 3))
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;; variable lookup
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(let-values ([(v s as f) (eval-exp 'x (list (binding 'x "hello")
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(binding 'y "bye")
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(binding 'x "world"))
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mt-σ)])
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(match-let ([(continue v s as f) (eval-exp 'x (list (binding 'x "hello")
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(binding 'y "bye")
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(binding 'x "world"))
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mt-σ)])
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(check-equal? v "hello"))
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;; variable binding
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(let-values ([(v s as f) (eval-exp '(let (y 12) "cake") mt-Γ mt-σ)])
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(match-let ([(continue v s as f) (eval-exp '(let (y 12) "cake") mt-Γ mt-σ)])
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(check-equal? v "cake"))
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(let-values ([(v s as f) (eval-exp '(let (y 12) y) mt-Γ mt-σ)])
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(match-let ([(continue v s as f) (eval-exp '(let (y 12) y) mt-Γ mt-σ)])
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(check-equal? v 12))
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;; if
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(let-values ([(v s as f) (eval-exp '(if #f 5 6) mt-Γ mt-σ)])
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(match-let ([(continue v s as f) (eval-exp '(if #f 5 6) mt-Γ mt-σ)])
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(check-equal? v 6))
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(let-values ([(v s as f) (eval-exp '(if #t 5 6) mt-Γ mt-σ)])
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(match-let ([(continue v s as f) (eval-exp '(if #t 5 6) mt-Γ mt-σ)])
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(check-equal? v 5))
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;; send!
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(let-values ([(v s as f) (eval-exp '(send! 5) mt-Γ mt-σ)])
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(match-let ([(continue v s as f) (eval-exp '(send! 5) mt-Γ mt-σ)])
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(check-equal? as (list (message 5)))
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(check-true (void? v)))
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;; set!
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(let-values ([(v s as f) (eval-exp '(set! x 12) mt-Γ (make-store '(x . "hello")))])
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(match-let ([(continue v s as f) (eval-exp '(set! x 12) mt-Γ (make-store '(x . "hello")))])
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(check-true (void? v))
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(check-equal? (hash-ref s 'x) 12))
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(let-values ([(v s as f) (eval-exp '(begin (set! x (+ 1 (read x)))
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(set! x (+ 1 (read x)))
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(set! x (+ 1 (read x)))
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(set! x (+ 1 (read x)))
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(read x))
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mt-Γ (make-store '(x . 0)))])
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(match-let ([(continue v s as f) (eval-exp '(begin (set! x (+ 1 (read x)))
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(set! x (+ 1 (read x)))
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(set! x (+ 1 (read x)))
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(set! x (+ 1 (read x)))
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(read x))
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mt-Γ (make-store '(x . 0)))])
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(check-equal? v 4))
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;; store read
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(let-values ([(v s as f) (eval-exp '(read x) mt-Γ (make-store '(y . 5) '(x . "hello")))])
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(match-let ([(continue v s as f) (eval-exp '(read x) mt-Γ (make-store '(y . 5) '(x . "hello")))])
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(check-equal? v "hello"))
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(let-values ([(v s as f) (eval-exp '(+ (- 5 1) (/ 4 (if (not #t) 1 2))) mt-Γ mt-σ)])
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(match-let ([(continue v s as f) (eval-exp '(+ (- 5 1) (/ 4 (if (not #t) 1 2))) mt-Γ mt-σ)])
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(check-equal? v 6))
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;; lambda
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(let-values ([(v s as f) (eval-exp '(let (f (lambda (x) (+ x 1))) (f 3)) mt-Γ mt-σ)])
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(match-let ([(continue v s as f) (eval-exp '(let (f (lambda (x) (+ x 1))) (f 3)) mt-Γ mt-σ)])
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(check-equal? v 4))
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(let-values ([(v s as f) (eval-exp '(let (z 12)
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(let (f (lambda (x) (+ x z)))
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(let (z 4)
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(f 3)))) mt-Γ mt-σ)])
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(match-let ([(continue v s as f) (eval-exp '(let (z 12)
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(let (f (lambda (x) (+ x z)))
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(let (z 4)
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(f 3)))) mt-Γ mt-σ)])
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(check-equal? v 15))
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(let-values ([(v s as f) (eval-exp '(let (f (lambda () (actor (react (assert 5)))))
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(f)) mt-Γ mt-σ)])
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(match-let ([(continue v s as f) (eval-exp '(let (f (lambda () (actor (react (assert 5)))))
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(f)) mt-Γ mt-σ)])
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(check-false (empty? as))))
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;; dollar-id? : any -> bool
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@ -408,7 +423,7 @@
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(?!)]
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['_ ?]
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[exp
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(define-values (v s as fs) (eval-exp exp Γ σ))
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(match-define (continue v _ _ _) (eval-exp exp Γ σ))
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v]))
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;; pat-bindings : pat -> (Listof var)
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@ -485,76 +500,56 @@
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;; projection->pattern to convert captures to wildcards
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(assertion (projection->pattern (observe (eval-pat (E-pat E) Γ σ)))))
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;; eval-exp* : (Listof exp) Γ σ -> (Values σ (Listof Action) (Listof FacetTree))
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;; evaluate a sequence of expressions for effect
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;; eval-exp* : (Listof exp) Γ σ -> (Result (Listof Values))
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;; evaluate a sequence of expressions
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(define (eval-exp* exps Γ σ)
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(for/fold ([sto σ]
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[as (list)]
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[facets (list)])
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([e (in-list exps)])
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(define-values (v new-sto more-as more-facets) (eval-exp e Γ σ))
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(values new-sto (append as more-as) (append facets more-facets))))
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(for-steps (list) σ (in-list exps)
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(lambda (vs σ e)
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(result-map (lambda (v) (append vs (list v)))
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(eval-exp e Γ σ)))))
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;; A Continue is (continue σ (Listof Action) (Listof FacetTree))
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(struct continue (sto as fs) #:transparent)
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;; A Stop is (stop σ (Listof Action))
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(struct stop (sto as) #:transparent)
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;; run-facet : facet π σ Γ Event -> (U Continue Stop)
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;; run-facet : facet π σ Γ Event -> Result
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(define (run-facet f π-old σ Γ e)
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(match-define `(react ,O ...) f)
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(for/fold ([s (continue σ (list) (list))])
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([o (in-list O)])
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(match s
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[(stop _ _) s]
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[(continue σ as facets)
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(match (run-endpoint o π-old σ Γ e)
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[(stop σ as)
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;; ok to discard previous as here I guess
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(stop σ as)]
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[(continue new-sto more-as more-facets)
|
||||
(continue new-sto (append as more-as) (append facets more-facets))])])))
|
||||
(for-steps #f σ (in-list O)
|
||||
(lambda (_ σ o)
|
||||
(run-endpoint o π-old σ Γ e))))
|
||||
|
||||
|
||||
;; run-endpoint : O π σ Γ Event -> (U Continue Stop)
|
||||
;; run-endpoint : O π σ Γ Event -> Result
|
||||
;; determine the effects of an endpoint in response to an event
|
||||
(define (run-endpoint O π-old σ Γ e)
|
||||
(match O
|
||||
;; event-insensitive endpoints
|
||||
[`(field ,_ ,_)
|
||||
(continue σ (list) (list))]
|
||||
(inj-result #f σ)]
|
||||
[`(on-start ,exp ...)
|
||||
(continue σ (list) (list))]
|
||||
(inj-result #f σ)]
|
||||
[`(assert ,exp)
|
||||
(continue σ (list) (list))]
|
||||
(inj-result #f σ)]
|
||||
;; event sensitive
|
||||
[`(stop-when ,E ,exps ...)
|
||||
(define bindings (occurrences E e π-old Γ σ))
|
||||
(cond
|
||||
[(empty? bindings)
|
||||
(continue σ (list) (list))]
|
||||
(inj-result #f σ)]
|
||||
[else
|
||||
(define-values (sto as)
|
||||
(for/fold ([sto σ]
|
||||
[as (list)])
|
||||
([captures (in-list bindings)])
|
||||
(define extended-env (append captures Γ))
|
||||
;; seems like we should ignore new facets here?
|
||||
(define-values (new-sto more-as facets) (eval-exp* exps extended-env sto))
|
||||
(values new-sto (append as more-as))))
|
||||
(match-define (continue _ sto as _)
|
||||
(for-steps #f σ (in-list bindings)
|
||||
(lambda (_ σ captures)
|
||||
(define extended-env (append captures Γ))
|
||||
(eval-exp* exps extended-env σ))))
|
||||
(stop sto as)])]
|
||||
[`(on ,E ,exps ...)
|
||||
(define bindings (occurrences E e π-old Γ σ))
|
||||
(cond
|
||||
[(empty? bindings)
|
||||
(continue σ (list) (list))]
|
||||
(inj-result #f σ)]
|
||||
[else
|
||||
(define-values (sto as facets)
|
||||
(for/fold ([sto σ]
|
||||
[as (list)]
|
||||
[facets (list)])
|
||||
([captures (in-list bindings)])
|
||||
(for-steps #f σ (in-list bindings)
|
||||
(lambda (_ sto captures)
|
||||
(define extended-env (append captures Γ))
|
||||
(define-values (new-sto more-as more-facets) (eval-exp* exps extended-env sto))
|
||||
(values new-sto (append as more-as) (append facets more-facets))))
|
||||
(continue sto as facets)])]))
|
||||
(eval-exp* exps extended-env sto)))])]))
|
||||
|
||||
;; endpoint-assertions : O Γ σ -> π
|
||||
;; IGNORE effects from such expressions (yadda yadda evil yadda yadda)
|
||||
|
|
@ -565,7 +560,7 @@
|
|||
[`(on-start ,exp ...)
|
||||
trie-empty]
|
||||
[`(assert ,exp)
|
||||
(define-values (v new-sto as facets) (eval-exp exp Γ σ))
|
||||
(match-define (continue v _ _ _) (eval-exp exp Γ σ))
|
||||
(assertion v)]
|
||||
[`(stop-when ,E ,exps ...)
|
||||
(subscription E Γ σ)]
|
||||
|
|
@ -588,7 +583,7 @@
|
|||
(define facet-sto (store-concat parent-sto sto))
|
||||
;; I'm really not confident about the way the stores are being handled here
|
||||
(match (run-facet stx π facet-sto env e)
|
||||
[(continue new-sto as new-facets)
|
||||
[(continue _ new-sto as new-facets)
|
||||
(define-values (final-sto final-as new-children)
|
||||
(for/fold ([sto new-sto]
|
||||
[as as]
|
||||
|
|
@ -622,7 +617,7 @@
|
|||
(define (actor-behavior e s)
|
||||
(cond
|
||||
[e
|
||||
(with-handlers ([exn:fail? (lambda (e) (quit #:exception e (list)))])
|
||||
(with-handlers ([exn:fail? (lambda (e) (eprintf "exception: ~v\n" e) (quit #:exception e (list)))])
|
||||
(match-define (actor-state π-old ft) s)
|
||||
(match (run-facets ft π-old mt-σ e)
|
||||
[(ok _ ft as)
|
||||
|
|
@ -668,7 +663,9 @@
|
|||
(set! balance (+ (read balance) amount)))))
|
||||
|
||||
(actor (react (on (asserted (list "account" $balance))
|
||||
(printf "Balance changed to ~a\n" balance))))
|
||||
(printf "Balance changed to ~a\n" balance))
|
||||
(stop-when (asserted (list "account" 70))
|
||||
(printf "bye\n"))))
|
||||
|
||||
(actor (react (stop-when (asserted (observe (list "deposit" _)))
|
||||
(send! (list "deposit" +100))
|
||||
|
|
@ -693,4 +690,4 @@
|
|||
(on (asserted 16))
|
||||
(on-start (send! 5))))))
|
||||
|
||||
(run multi-level-ex)
|
||||
(run bank-account)
|
||||
Loading…
Reference in New Issue