Add feature parity with Rust's Result type
This commit is contained in:
parent
c3534276b4
commit
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@ -1,9 +1,20 @@
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package com.mikebull94.result
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package com.mikebull94.result
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/**
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/**
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* - Elm: [Result.andThen](http://package.elm-lang.org/packages/elm-lang/core/latest/Result#andThen)
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* Rust: [Result.and](https://doc.rust-lang.org/std/result/enum.Result.html#method.and)
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*/
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*/
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inline fun <V, E, U> Result<V, E>.andThen(transform: (V) -> Result<U, E>): Result<U, E> {
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infix fun <V, E> Result<V, E>.and(result: Result<V, E>): Result<V, E> {
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return when(this) {
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is Ok -> result
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is Error -> err(error)
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}
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}
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/**
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* - Elm: [Result.andThen](http://package.elm-lang.org/packages/elm-lang/core/latest/Result#andThen)
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* - Rust: [Result.and_then](https://doc.rust-lang.org/std/result/enum.Result.html#method.and_then)
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*/
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infix inline fun <V, E, U> Result<V, E>.andThen(transform: (V) -> Result<U, E>): Result<U, E> {
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return when (this) {
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return when (this) {
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is Ok -> transform(value)
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is Ok -> transform(value)
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is Error -> err(error)
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is Error -> err(error)
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@ -2,6 +2,7 @@ package com.mikebull94.result
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/**
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/**
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* - Elm: [Result.toMaybe](http://package.elm-lang.org/packages/elm-lang/core/latest/Result#toMaybe)
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* - Elm: [Result.toMaybe](http://package.elm-lang.org/packages/elm-lang/core/latest/Result#toMaybe)
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* - Rust: [Result.ok](https://doc.rust-lang.org/std/result/enum.Result.html#method.ok)
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*/
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*/
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fun <V, E> Result<V, E>.get(): V? {
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fun <V, E> Result<V, E>.get(): V? {
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return when (this) {
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return when (this) {
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@ -11,11 +12,33 @@ fun <V, E> Result<V, E>.get(): V? {
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}
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}
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/**
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/**
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* - Elm: [Result.withDefault](http://package.elm-lang.org/packages/elm-lang/core/latest/Result#withDefault)
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* - Rust: [Result.err](https://doc.rust-lang.org/std/result/enum.Result.html#method.err)
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*/
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*/
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infix fun <V, E> Result<V, E>.getOrElse(default: V): V {
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fun <V, E> Result<V, E>.getError(): E? {
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return when(this) {
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is Ok -> null
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is Error -> error
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}
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}
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/**
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* - Elm: [Result.withDefault](http://package.elm-lang.org/packages/elm-lang/core/latest/Result#withDefault)
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* - Rust: [Result.unwrap_or](https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or)
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*/
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infix fun <V, E> Result<V, E>.getOr(default: V): V {
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return when (this) {
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return when (this) {
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is Ok -> value
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is Ok -> value
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is Error -> default
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is Error -> default
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}
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}
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}
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}
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/**
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* - Elm: [Result.extract](http://package.elm-lang.org/packages/circuithub/elm-result-extra/1.4.0/Result-Extra#extract)
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* - Rust: [Result.unwrap_or_else](https://doc.rust-lang.org/src/core/result.rs.html#735-740)
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*/
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infix inline fun <V,E> Result<V,E>.getOrElse(transform: (E) -> V): V {
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return when (this) {
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is Ok -> value
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is Error -> transform(error)
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}
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}
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@ -3,8 +3,9 @@ package com.mikebull94.result
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/**
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/**
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* - Elm: [Result.map](http://package.elm-lang.org/packages/elm-lang/core/latest/Result#map)
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* - Elm: [Result.map](http://package.elm-lang.org/packages/elm-lang/core/latest/Result#map)
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* - Haskell: [Data.Bifunctor.first](https://hackage.haskell.org/package/base-4.10.0.0/docs/Data-Bifunctor.html#v:first)
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* - Haskell: [Data.Bifunctor.first](https://hackage.haskell.org/package/base-4.10.0.0/docs/Data-Bifunctor.html#v:first)
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* - Rust: [Result.map](https://doc.rust-lang.org/std/result/enum.Result.html#method.map)
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*/
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*/
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inline fun <V, E, U> Result<V, E>.map(transform: (V) -> U): Result<U, E> {
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infix inline fun <V, E, U> Result<V, E>.map(transform: (V) -> U): Result<U, E> {
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return when (this) {
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return when (this) {
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is Ok -> ok(transform(value))
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is Ok -> ok(transform(value))
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is Error -> err(error)
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is Error -> err(error)
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@ -14,8 +15,9 @@ inline fun <V, E, U> Result<V, E>.map(transform: (V) -> U): Result<U, E> {
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/**
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/**
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* - Elm: [Result.mapError](http://package.elm-lang.org/packages/elm-lang/core/latest/Result#mapError)
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* - Elm: [Result.mapError](http://package.elm-lang.org/packages/elm-lang/core/latest/Result#mapError)
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* - Haskell: [Data.Bifunctor.right](https://hackage.haskell.org/package/base-4.10.0.0/docs/Data-Bifunctor.html#v:second)
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* - Haskell: [Data.Bifunctor.right](https://hackage.haskell.org/package/base-4.10.0.0/docs/Data-Bifunctor.html#v:second)
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* - Rust: [Result.map_err](https://doc.rust-lang.org/std/result/enum.Result.html#method.map_err)
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*/
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*/
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inline fun <V, E, U> Result<V, E>.mapError(transform: (E) -> U): Result<V, U> {
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infix inline fun <V, E, U> Result<V, E>.mapError(transform: (E) -> U): Result<V, U> {
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return when (this) {
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return when (this) {
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is Ok -> ok(value)
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is Ok -> ok(value)
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is Error -> err(transform(error))
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is Error -> err(transform(error))
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@ -1,18 +1,21 @@
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package com.mikebull94.result
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package com.mikebull94.result
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infix fun <V, E> Result<V, E>.or(default: V): Result<V, E> {
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/**
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* - Rust: [Result.or](https://doc.rust-lang.org/std/result/enum.Result.html#method.or)
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*/
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infix fun <V, E> Result<V, E>.or(result: Result<V, E>): Result<V, E> {
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return when(this) {
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return when(this) {
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is Ok -> this
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is Ok -> ok(value)
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is Error -> ok(default)
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is Error -> result
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}
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}
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}
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}
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/**
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/**
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* - Elm: [Result.extract](http://package.elm-lang.org/packages/circuithub/elm-result-extra/1.4.0/Result-Extra#extract)
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* - Rust: [Result.or_else](https://doc.rust-lang.org/std/result/enum.Result.html#method.or_else)
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*/
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*/
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inline fun <V, E> Result<V, E>.extract(transform: (E) -> V): V {
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infix inline fun <V, E> Result<V, E>.orElse(transform: (E) -> Result<V, E>): Result<V, E> {
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return when (this) {
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return when (this) {
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is Ok -> value
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is Ok -> ok(this.value)
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is Error -> transform(error)
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is Error -> transform(error)
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}
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}
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}
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}
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@ -3,6 +3,7 @@ package com.mikebull94.result
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/**
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/**
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* - Elm: [Result](http://package.elm-lang.org/packages/elm-lang/core/5.1.1/Result)
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* - Elm: [Result](http://package.elm-lang.org/packages/elm-lang/core/5.1.1/Result)
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* - Haskell: [Data.Either](https://hackage.haskell.org/package/base-4.10.0.0/docs/Data-Either.html)
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* - Haskell: [Data.Either](https://hackage.haskell.org/package/base-4.10.0.0/docs/Data-Either.html)
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* - Rust: [Result](https://doc.rust-lang.org/std/result/enum.Result.html)
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*/
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*/
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sealed class Result<out V, out E>
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sealed class Result<out V, out E>
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43
src/main/kotlin/com/mikebull94/result/ResultIterator.kt
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43
src/main/kotlin/com/mikebull94/result/ResultIterator.kt
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package com.mikebull94.result
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/**
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* - Rust: [Result.iter](https://doc.rust-lang.org/std/result/enum.Result.html#method.iter)
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*/
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fun <V, E> Result<V, E>.iterator(): Iterator<V> {
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return ResultIterator(this)
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}
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/**
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* Rust: [Result.iter_mut](https://doc.rust-lang.org/std/result/enum.Result.html#method.iter_mut)
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*/
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fun <V, E> Result<V, E>.mutableIterator(): MutableIterator<V> {
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return ResultIterator(this)
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}
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private class ResultIterator<out V, out E>(private val result: Result<V, E>) : MutableIterator<V> {
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private var yielded = false
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override fun hasNext(): Boolean {
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if (yielded) {
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return false
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}
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return when (result) {
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is Ok -> true
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is Error -> false
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}
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}
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override fun next(): V {
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if (!yielded && result is Ok) {
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yielded = true
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return result.value
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} else {
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throw NoSuchElementException()
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}
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}
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override fun remove() {
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yielded = true
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}
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}
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43
src/main/kotlin/com/mikebull94/result/Unwrap.kt
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43
src/main/kotlin/com/mikebull94/result/Unwrap.kt
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package com.mikebull94.result
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class UnwrapException(message: String): Exception(message)
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/**
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* - Rust: [Result.unwrap](https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap)
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*/
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fun <V, E> Result<V, E>.unwrap(): V {
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return when (this) {
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is Ok -> value
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is Error -> throw UnwrapException("called Result.wrap on an Error value $error")
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}
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}
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/**
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* - Rust: [Result.expect](https://doc.rust-lang.org/std/result/enum.Result.html#method.expect)
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*/
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infix fun <V, E> Result<V, E>.expect(message: String): V {
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return when (this) {
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is Ok -> value
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is Error -> throw UnwrapException(message)
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}
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}
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/**
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* - Rust: [Result.unwrap_err](https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_err)
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*/
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fun <V, E> Result<V, E>.unwrapError(): E {
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return when (this) {
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is Ok -> throw UnwrapException("called Result.unwrapError on an Ok value $value")
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is Error -> error
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}
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}
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/**
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* - Rust: [Reseult.expect_err](https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err)
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*/
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infix fun <V, E> Result<V, E>.expectError(message: String): E {
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return when (this) {
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is Ok -> throw UnwrapException(message)
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is Error -> error
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}
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}
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@ -8,6 +8,18 @@ import org.junit.jupiter.api.Test
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internal class AndTest {
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internal class AndTest {
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private object AndError
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private object AndError
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@Test
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internal fun `and should return the result value if ok`() {
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val value = ok(230).and(ok(500)).get()
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assertThat(value, equalTo(500))
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}
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@Test
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internal fun `and should return the result value if not ok`() {
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val error = ok(300).and(err("hello world")).getError()
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assertThat(error, equalTo("hello world"))
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}
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@Test
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@Test
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internal fun `andThen should return the transformed result value if ok`() {
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internal fun `andThen should return the transformed result value if ok`() {
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val value = ok(5).andThen { ok(it + 7) }.get()
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val value = ok(5).andThen { ok(it + 7) }.get()
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@ -16,10 +28,7 @@ internal class AndTest {
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@Test
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@Test
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internal fun `andThen should return the result error if not ok`() {
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internal fun `andThen should return the result error if not ok`() {
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val result = ok(20).andThen { ok(it + 43) }.andThen { err(AndError) }
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val error = ok(20).andThen { ok(it + 43) }.andThen { err(AndError) }.getError()!!
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assertThat(error, sameInstance(AndError))
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result as Error
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assertThat(result.error, sameInstance(AndError))
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}
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}
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}
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}
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@ -20,14 +20,38 @@ internal class GetTest {
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}
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}
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@Test
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@Test
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internal fun `getOrElse should return the result value if ok`() {
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internal fun `getError should return null if ok`() {
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val value = ok("hello").getOrElse("world")
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val error = ok("example").getError()
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assertThat(error, equalTo(null))
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}
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@Test
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internal fun `getError should return the result error if not ok`() {
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val error = err("example").getError()
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assertThat(error, equalTo("example"))
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}
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@Test
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internal fun `getOr should return the result value if ok`() {
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val value = ok("hello").getOr("world")
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assertThat(value, equalTo("hello"))
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assertThat(value, equalTo("hello"))
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}
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}
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@Test
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@Test
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internal fun `getOrElse should return default value if not ok`() {
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internal fun `getOr should return default value if not ok`() {
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val value = err(GetError).getOrElse("default")
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val value = err(GetError).getOr("default")
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assertThat(value, equalTo("default"))
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assertThat(value, equalTo("default"))
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}
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}
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@Test
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internal fun `getOrElse should return the result value if ok`() {
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val value = ok("hello").getOrElse { "world" }
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assertThat(value, equalTo("hello"))
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}
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@Test
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internal fun `getOrElse should return the transformed result error if ok`() {
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val value = err("hello").getOrElse { "world" }
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assertThat(value, equalTo("world"))
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}
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}
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}
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@ -9,25 +9,25 @@ internal class OrTest {
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@Test
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@Test
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internal fun `or should return the result value if ok`() {
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internal fun `or should return the result value if ok`() {
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val value = ok(500).or(1000).get()
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val value = ok(500).or(ok(1000)).get()
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assertThat(value, equalTo(500))
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assertThat(value, equalTo(500))
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}
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}
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@Test
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@Test
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internal fun `or should return the default value if not ok`() {
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internal fun `or should return the default value if not ok`() {
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val error = err(OrError).or(5000).get()
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val error = err(OrError).or(ok(5000)).get()
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assertThat(error, equalTo(5000))
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assertThat(error, equalTo(5000))
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}
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}
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@Test
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@Test
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internal fun `extract should return the result value if ok`() {
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internal fun `orElse should return the result value if ok`() {
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val value = ok("hello").extract { OrError } as String
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val value = ok(3000).orElse { ok(4000) }.get()
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assertThat(value, equalTo("hello"))
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assertThat(value, equalTo(3000))
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}
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}
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@Test
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@Test
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internal fun `extract should return the transformed result error if not ok`() {
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internal fun `orElse should return the transformed value if not ok`() {
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val error = err("hello").extract { "$it darkness" }
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val error = err(4000).orElse { ok(2000) }.get()
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assertThat(error, equalTo("hello darkness"))
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assertThat(error, equalTo(2000))
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}
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}
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}
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}
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69
src/test/kotlin/com/mikebull94/result/ResultIteratorTest.kt
Normal file
69
src/test/kotlin/com/mikebull94/result/ResultIteratorTest.kt
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package com.mikebull94.result
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import com.natpryce.hamkrest.assertion.assertThat
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import com.natpryce.hamkrest.equalTo
|
||||||
|
import org.junit.jupiter.api.Assertions.*
|
||||||
|
import org.junit.jupiter.api.Test
|
||||||
|
|
||||||
|
internal class ResultIteratorTest {
|
||||||
|
@Test
|
||||||
|
internal fun `hasNext should return true if unyielded and result is ok`() {
|
||||||
|
val iterator = ok("hello").iterator()
|
||||||
|
assertThat(iterator.hasNext(), equalTo(true))
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
internal fun `hasNext should return false if result is not ok`() {
|
||||||
|
val iterator = err("hello").iterator()
|
||||||
|
assertThat(iterator.hasNext(), equalTo(false))
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
internal fun `hasNext should return false if yielded`() {
|
||||||
|
val iterator = ok("hello").iterator()
|
||||||
|
iterator.next()
|
||||||
|
assertThat(iterator.hasNext(), equalTo(false))
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
internal fun `next should return the result value if unyielded and result is ok`() {
|
||||||
|
val value = ok("hello").iterator().next()
|
||||||
|
assertThat(value, equalTo("hello"))
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
internal fun `next should throw NoSuchElementException if unyielded and result is not ok`() {
|
||||||
|
val iterator = err("hello").iterator()
|
||||||
|
|
||||||
|
assertThrows(NoSuchElementException::class.java) {
|
||||||
|
iterator.next()
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
internal fun `next should throw NoSuchElementException if yielded and result is ok`() {
|
||||||
|
val iterator = ok("hello").iterator()
|
||||||
|
iterator.next()
|
||||||
|
|
||||||
|
assertThrows(NoSuchElementException::class.java) {
|
||||||
|
iterator.next()
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
internal fun `remove should make hasNext return false`() {
|
||||||
|
val iterator = ok("hello").mutableIterator()
|
||||||
|
iterator.remove()
|
||||||
|
assertThat(iterator.hasNext(), equalTo(false))
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
internal fun `remove should make next throw NoSuchElementException`() {
|
||||||
|
val iterator = ok("hello").mutableIterator()
|
||||||
|
iterator.remove()
|
||||||
|
|
||||||
|
assertThrows(NoSuchElementException::class.java) {
|
||||||
|
iterator.next()
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
60
src/test/kotlin/com/mikebull94/result/UnwrapTest.kt
Normal file
60
src/test/kotlin/com/mikebull94/result/UnwrapTest.kt
Normal file
@ -0,0 +1,60 @@
|
|||||||
|
package com.mikebull94.result
|
||||||
|
|
||||||
|
import com.natpryce.hamkrest.assertion.assertThat
|
||||||
|
import com.natpryce.hamkrest.equalTo
|
||||||
|
import org.junit.jupiter.api.Assertions.assertThrows
|
||||||
|
import org.junit.jupiter.api.Test
|
||||||
|
|
||||||
|
internal class UnwrapTest {
|
||||||
|
@Test
|
||||||
|
internal fun `unwrap should return the result value if ok`() {
|
||||||
|
val value = ok(5000).unwrap()
|
||||||
|
assertThat(value, equalTo(5000))
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
internal fun `unwrap should throw an UnwrapException if not ok`() {
|
||||||
|
assertThrows(UnwrapException::class.java, {
|
||||||
|
err(5000).unwrap()
|
||||||
|
}, "called Result.wrap on an Error value 5000")
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
internal fun `expect should return the result value if ok`() {
|
||||||
|
val value = ok(1994).expect("the year should be 1994")
|
||||||
|
assertThat(value, equalTo(1994))
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
internal fun `expect should throw an UnwrapException with a specified message if not ok`() {
|
||||||
|
assertThrows(UnwrapException::class.java, {
|
||||||
|
err(1994).expect("the year should be 1994")
|
||||||
|
}, "the year should be 1994")
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
internal fun `unwrapError should throw an UnwrapException if ok`() {
|
||||||
|
assertThrows(UnwrapException::class.java, {
|
||||||
|
ok("example").unwrapError()
|
||||||
|
}, "called Result.unwrapError on an Ok value example")
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
internal fun `unwrapError should return the result error if not ok`() {
|
||||||
|
val error = err("example").unwrapError()
|
||||||
|
assertThat(error, equalTo("example"))
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
internal fun `expectError should throw an UnwrapException with a specified message if ok`() {
|
||||||
|
assertThrows(UnwrapException::class.java, {
|
||||||
|
ok(2010).expectError("the year should be 2010")
|
||||||
|
}, "the year should be 2010")
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
internal fun `expectError should return the result error if not ok`() {
|
||||||
|
val error = err(2010).expectError("the year should be 2010")
|
||||||
|
assertThat(error, equalTo(2010))
|
||||||
|
}
|
||||||
|
}
|
Loading…
Reference in New Issue
Block a user