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An Algebraic Effect System for Golang.
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Stop resume function takes no arguments
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fx.go
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fx.go
···
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type Fx[S, V any] struct {
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imm func() V
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sus func(S) Fx[S, V]
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stp func(any) Fx[S, V]
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stp func() Fx[S, V]
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}
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type FxPure[V any] = Fx[Nil, V]
···
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// An stopped effect that panics if restarted
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func Halt[S, V any]() Fx[S, V] {
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return Stop(func(x any) Fx[S, V] {
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return Stop(func() Fx[S, V] {
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panic("tried to restart halted effect. try using fx.Replace instead")
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})
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}
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func Stop[S, V any](f func(any) Fx[S, V]) Fx[S, V] { return Fx[S, V]{stp: f} }
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func Stop[S, V any](f func() Fx[S, V]) Fx[S, V] { return Fx[S, V]{stp: f} }
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// Replace with y if x is already stopped. Otherwise x continues.
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func Replace[S, V any](y func() Fx[S, V]) func(Fx[S, V]) Fx[S, V] {
···
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func Cont[T, U, S, V any](cmap func(T) S, fmap func(V) Fx[T, U]) func(Fx[S, V]) Fx[T, U] {
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return func(e Fx[S, V]) Fx[T, U] {
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if e.stp != nil {
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return Stop(func(x any) Fx[T, U] {
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return Cont(cmap, fmap)(e.stp(x))
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return Stop(func() Fx[T, U] {
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return Cont(cmap, fmap)(e.stp())
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})
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}
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if e.imm != nil {
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func ContraMap[V, S, R any](f func(R) S) func(Fx[S, V]) Fx[R, V] {
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return func(e Fx[S, V]) Fx[R, V] {
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if e.stp != nil {
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return Stop(func(x any) Fx[R, V] {
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return ContraMap[V](f)(e.stp(x))
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return Stop(func() Fx[R, V] {
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return ContraMap[V](f)(e.stp())
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})
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}
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if e.imm != nil {
···
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func ProvideLeft[A, B, V any](e Fx[And[A, B], V], a A) Fx[B, V] {
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if e.stp != nil {
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return Stop(func(x any) Fx[B, V] {
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return ProvideLeft(e.stp(x), a)
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return Stop(func() Fx[B, V] {
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return ProvideLeft(e.stp(), a)
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})
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}
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if e.imm != nil {
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for {
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e = e.sus(ab)
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if e.stp != nil {
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return Stop(func(x any) Fx[B, V] {
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return loop(e.stp(x))
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return Stop(func() Fx[B, V] {
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return loop(e.stp())
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})
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}
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if e.imm != nil {