arrow-optics/arrow.optics/PPrism

PPrism

interface PPrism<S, T, A, B> : POptional<S, T, A, B> , PSetter<S, T, A, B> , POptionalGetter<S, T, A> , PTraversal<S, T, A, B> , PEvery<S, T, A, B> (source)

A Prism is a loss less invertible optic that can look into a structure and optionally find its focus. Mostly used for finding a focus that is only present under certain conditions i.e. list head Prism, Int>

A (polymorphic) PPrism is useful when setting or modifying a value for a polymorphic sum type i.e. PPrism, Option, String, Int>

A PPrism gathers the two concepts of pattern matching and constructor and thus can be seen as a pair of functions:

getOrModify: A -> Either<A, B> meaning it returns the focus of a PPrism OR the original value
reverseGet : B -> A meaning we can construct the source type of a PPrism from a focus B

Parameters

the source of a PPrism

the modified source of a PPrism

the focus of a PPrism

the modified focus of a PPrism

Types

Companion

object Companion

Functions

all

open fun all(source: S, predicate: (focus: A) -> Boolean): Boolean

Check if all targets satisfy the predicate

any

open fun any(source: S, predicate: (focus: A) -> Boolean): Boolean

Returns true if at least one focus matches the given predicate.

choice

open infix fun <C> choice(other: Fold<C, A>): Fold<Either<S, C>, A>

Join two Fold with the same target

open infix fun <S1, T1> choice(other: POptional<S1, T1, A, B>): POptional<Either<S, S1>, Either<T, T1>, A, B>

Join two POptional with the same focus B

open infix fun <S1, T1> choice(other: POptionalGetter<S1, T1, A>): POptionalGetter<Either<S, S1>, Either<T, T1>, A>

Join two POptionalGetter with the same focus

open infix fun <U, V> choice(other: PSetter<U, V, A, B>): PSetter<Either<S, U>, Either<T, V>, A, B>

Join two PSetter with the same target

open fun <U, V> choice(other: PTraversal<U, V, A, B>): PTraversal<Either<S, U>, Either<T, V>, A, B>

compose

open infix fun <C> compose(other: Fold<in A, out C>): Fold<S, C>

Compose a Fold with a Fold

open infix fun <C, D> compose(other: PEvery<in A, out B, out C, in D>): PEvery<S, T, C, D>

Compose a PEvery with a PEvery

open infix fun <C, D> compose(other: POptional<in A, out B, out C, in D>): POptional<S, T, C, D>

Compose a POptional with a POptional

open infix fun <C> compose(other: POptionalGetter<in A, T, out C>): POptionalGetter<S, T, C>

Compose a POptionalGetter with a POptionalGetter

open infix fun <C, D> compose(other: PPrism<in A, out B, out C, in D>): PPrism<S, T, C, D>

Compose a PPrism with another PPrism

open infix fun <C, D> compose(other: PSetter<in A, out B, out C, in D>): PSetter<S, T, C, D>

Compose a PSetter with a PSetter

open infix fun <C, D> compose(other: PTraversal<in A, out B, out C, in D>): PTraversal<S, T, C, D>

Compose a PTraversal with a PTraversal

exists

open fun exists(source: S, predicate: (focus: A) -> Boolean): Boolean

Check whether at least one element satisfies the predicate.

findOrNull

open fun findOrNull(source: S, predicate: (focus: A) -> Boolean): A?

Find the first element matching the predicate, if one exists.

first

open override fun <C> first(): PPrism<Pair<S, C>, Pair<T, C>, Pair<A, C>, Pair<B, C>>

Create a product of the PPrism and a type C

firstOrNull

open fun firstOrNull(source: S): A?

Get the first target or null

fold

open fun fold(M: Monoid<A>, source: S): A

Fold using the given Monoid instance.

foldMap

open override fun <R> foldMap(M: Monoid<R>, source: S, map: (focus: A) -> R): R

Map each target to a type R and use a Monoid to fold the results

getAll

open fun getAll(source: S): List<A>

Get all targets of the Fold

getOrModify

abstract override fun getOrModify(source: S): Either<T, A>

Get the focus of a POptional or return the original value while allowing the type to change if it does not match

getOrNull

open fun getOrNull(source: S): A?

Get the focus of an OptionalGetter or null if the is not there

isEmpty

open fun isEmpty(source: S): Boolean

Check if there is no target

isNotEmpty

open fun isNotEmpty(source: S): Boolean

Check if there is at least one target

lastOrNull

open fun lastOrNull(source: S): A?

Get the last target or null

left

open override fun <C> left(): PPrism<Either<S, C>, Either<T, C>, Either<A, C>, Either<B, C>>

Create a sum of the PPrism and a type C

lift

open fun lift(map: (focus: A) -> B): (source: S) -> T

Lift a function map: (A) -> B to the context of S: (S) -> T`

liftNullable

open fun liftNullable(f: (focus: A) -> B): (source: S) -> T?

Lift a function f: (A) -> B to the context of S: (S) -> T?`

modify

open override fun modify(source: S, map: (A) -> B): T

Modify the focus of a PPrism with a function

modifyNullable

open fun modifyNullable(source: S, map: (focus: A) -> B): T?

Modify the focus of a POptional with a function map

plus

open operator fun <C> plus(other: Fold<in A, out C>): Fold<S, C>

open operator fun <C, D> plus(other: PEvery<in A, out B, out C, in D>): PEvery<S, T, C, D>

open operator fun <C, D> plus(other: POptional<in A, out B, out C, in D>): POptional<S, T, C, D>

open operator fun <C, D> plus(other: POptionalGetter<in A, T, out C>): POptionalGetter<S, T, C>

open operator fun <C, D> plus(other: PPrism<in A, out B, out C, in D>): PPrism<S, T, C, D>

open operator fun <C, D> plus(other: PSetter<in A, out B, out C, in D>): PSetter<S, T, C, D>

open operator fun <C, D> plus(other: PTraversal<in A, out B, out C, in D>): PTraversal<S, T, C, D>

reverseGet

abstract fun reverseGet(focus: B): T

right

open override fun <C> right(): PPrism<Either<C, S>, Either<C, T>, Either<C, A>, Either<C, B>>

Create a sum of a type C and the PPrism

second

open override fun <C> second(): PPrism<Pair<C, S>, Pair<C, T>, Pair<C, A>, Pair<C, B>>

Create a product of a type C and the PPrism

set

open override fun set(source: S, focus: B): T

Set the focus of a PPrism with a value

setNullable

open fun setNullable(source: S, b: B): T?

Set the focus of a POptional with a value.

size

open fun size(source: S): Int

Calculate the number of targets

Properties

every

open val <U, V> PLens<U, V, S, T>.every: PTraversal<U, V, A, B>

DSL to compose Traversal with a Lens for a structure S to see all its foci A

open val <U, V> PIso<U, V, S, T>.every: PTraversal<U, V, A, B>

DSL to compose Traversal with a Iso for a structure S to see all its foci A

open val <U, V> PPrism<U, V, S, T>.every: PTraversal<U, V, A, B>

DSL to compose Traversal with a Prism for a structure S to see all its foci A

open val <U, V> POptional<U, V, S, T>.every: PTraversal<U, V, A, B>

DSL to compose Traversal with a Optional for a structure S to see all its foci A

open val <U, V> PSetter<U, V, S, T>.every: PSetter<U, V, A, B>

DSL to compose Traversal with a Setter for a structure S to see all its foci A

open val <U, V> PTraversal<U, V, S, T>.every: PTraversal<U, V, A, B>

DSL to compose Traversal with a Traversal for a structure S to see all its foci A

open val <U, V> PEvery<U, V, S, T>.every: PTraversal<U, V, A, B>

DSL to compose Traversal with a PEvery for a structure S to see all its foci A

Inheritors

PIso

Extensions

fun <T, S, I, A> Prism<T, S>.at(AT: At<S, I, A>, i: I): Optional<T, A>

DSL to compose At with a Prism for a structure S to focus in on A at given index I.

fun <T, S, I, A> Optional<T, S>.at(AT: At<S, I, A>, i: I): Optional<T, A>

DSL to compose At with an Optional for a structure S to focus in on A at given index I.

fun <T, S, I, A> Setter<T, S>.at(AT: At<S, I, A>, i: I): Setter<T, A>

DSL to compose At with a Setter for a structure S to focus in on A at given index I.

fun <T, S, I, A> Fold<T, S>.at(AT: At<S, I, A>, i: I): Fold<T, A>

DSL to compose At with a Fold for a structure S to focus in on A at given index I.

fun <T, S, I, A> Traversal<T, S>.at(AT: At<S, I, A>, i: I): Traversal<T, A>

DSL to compose At with a Traversal for a structure S to focus in on A at given index I.

every

fun <T, S, A> Prism<T, S>.every(TR: Every<S, A>): Every<T, A>

DSL to compose Traversal with a Prism for a structure S to see all its foci A

fun <T, S, A> Optional<T, S>.every(TR: Every<S, A>): Every<T, A>

DSL to compose Traversal with an Optional for a structure S to see all its foci A

fun <T, S, A> Setter<T, S>.every(TR: Every<S, A>): Setter<T, A>

DSL to compose Traversal with a Setter for a structure S to see all its foci A

fun <T, S, A> Fold<T, S>.every(TR: Every<S, A>): Fold<T, A>

DSL to compose Traversal with a Fold for a structure S to see all its foci A

fun <T, S, A> Traversal<T, S>.every(TR: Every<S, A>): Traversal<T, A>

DSL to compose Traversal with a Traversal for a structure S to see all its foci A

index

fun <T, S, I, A> Prism<T, S>.index(ID: Index<S, I, A>, i: I): Optional<T, A>

DSL to compose Index with a Prism for a structure S to focus in on A at given index I

fun <T, S, I, A> Optional<T, S>.index(ID: Index<S, I, A>, i: I): Optional<T, A>

DSL to compose Index with an Optional for a structure S to focus in on A at given index I

fun <T, S, I, A> Setter<T, S>.index(ID: Index<S, I, A>, i: I): Setter<T, A>

DSL to compose Index with a Setter for a structure S to focus in on A at given index I

fun <T, S, I, A> Fold<T, S>.index(ID: Index<S, I, A>, i: I): Fold<T, A>

DSL to compose Index with a Fold for a structure S to focus in on A at given index I

fun <T, S, I, A> Traversal<T, S>.index(ID: Index<S, I, A>, i: I): Traversal<T, A>

DSL to compose Index with a Traversal for a structure S to focus in on A at given index I

left

val <A, L, R> Prism<A, Either<L, R>>.left: Prism<A, L>

DSL to compose a Prism with focus Either with a Prism with a focus of Either.Left<L>

val <A, L, R> Optional<A, Either<L, R>>.left: Optional<A, L>

DSL to compose a Optional with focus Either with a Prism with a focus of Either.Left<L>

val <A, L, R> Traversal<A, Either<L, R>>.left: Traversal<A, L>

DSL to compose a Traversal with focus Either with a Prism with a focus of Either.Left<L>

right

val <A, L, R> Prism<A, Either<L, R>>.right: Prism<A, R>

DSL to compose a Prism with focus Either with a Prism with a focus of Either.Right<R>

val <A, L, R> Optional<A, Either<L, R>>.right: Optional<A, R>

DSL to compose a Optional with focus Either with a Prism with a focus of Either.Right<R>

val <A, L, R> Traversal<A, Either<L, R>>.right: Traversal<A, R>

DSL to compose a Traversal with focus Either with a Prism with a focus of Either.Right<R>

some

val <T, S> Prism<T, Option<S>>.some: Prism<T, S>

DSL to compose a Prism with focus arrow.core.Some with a Prism with a focus of Option<S>

val <T, S> Optional<T, Option<S>>.some: Optional<T, S>

DSL to compose a Prism with focus arrow.core.Some with a Optional with a focus of Option<S>

val <T, S> Setter<T, Option<S>>.some: Setter<T, S>

DSL to compose a Prism with focus arrow.core.Some with a Setter with a focus of Option<S>

val <T, S> Fold<T, Option<S>>.some: Fold<T, S>

DSL to compose a Prism with focus arrow.core.Some with a Fold with a focus of Option<S>

val <T, S> Traversal<T, Option<S>>.some: Traversal<T, S>

DSL to compose a Prism with focus arrow.core.Some with a Traversal with a focus of Option<S>