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Extract recover functions to separate file
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141 changes: 141 additions & 0 deletions
141
kotlin-result/src/commonMain/kotlin/com/github/michaelbull/result/Recover.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,141 @@ | ||
| package com.github.michaelbull.result | ||
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| import kotlin.contracts.InvocationKind | ||
| import kotlin.contracts.contract | ||
|
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| /** | ||
| * Returns the [transformation][transform] of the [error][Err.error] if this [Result] is [Err], | ||
| * otherwise this [Ok]. | ||
| */ | ||
| public inline infix fun <V, E> Result<V, E>.recover(transform: (E) -> V): Ok<V> { | ||
| contract { | ||
| callsInPlace(transform, InvocationKind.AT_MOST_ONCE) | ||
| } | ||
|
|
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| return when (this) { | ||
| is Ok -> this | ||
| is Err -> Ok(transform(error)) | ||
| } | ||
| } | ||
|
|
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| /** | ||
| * Returns the [transformation][transform] of the [error][Err.error], catching and encapsulating any | ||
| * thrown exception as a failure if this [Result] is [Err], otherwise this [Ok]. | ||
| */ | ||
| public inline infix fun <V, E> Result<V, E>.recoverCatching(transform: (E) -> V): Result<V, Throwable> { | ||
| contract { | ||
| callsInPlace(transform, InvocationKind.AT_MOST_ONCE) | ||
| } | ||
|
|
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| return when (this) { | ||
| is Ok -> this | ||
| is Err -> { | ||
| try { | ||
| Ok(transform(error)) | ||
| } catch (e: Throwable) { | ||
| Err(e) | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
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| /** | ||
| * Returns the [transformation][transform] of the [error][Err.error] if this [Result] is [Err] | ||
| * and satisfies the given [predicate], otherwise this [Result]. | ||
| */ | ||
| public inline fun <V, E> Result<V, E>.recoverIf(predicate: (E) -> Boolean, transform: (E) -> V): Result<V, E> { | ||
| contract { | ||
| callsInPlace(predicate, InvocationKind.AT_MOST_ONCE) | ||
| callsInPlace(transform, InvocationKind.AT_MOST_ONCE) | ||
| } | ||
|
|
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| return when (this) { | ||
| is Ok -> this | ||
| is Err -> if (predicate(error)) { | ||
| Ok(transform(error)) | ||
| } else { | ||
| this | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Returns the [transformation][transform] of the [error][Err.error] if this [Result] is [Err] | ||
| * and _does not_ satisfy the given [predicate], otherwise this [Result]. | ||
| */ | ||
| public inline fun <V, E> Result<V, E>.recoverUnless(predicate: (E) -> Boolean, transform: (E) -> V): Result<V, E> { | ||
| contract { | ||
| callsInPlace(predicate, InvocationKind.AT_MOST_ONCE) | ||
| callsInPlace(transform, InvocationKind.AT_MOST_ONCE) | ||
| } | ||
|
|
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| return when (this) { | ||
| is Ok -> this | ||
| is Err -> if (!predicate(error)) { | ||
| Ok(transform(error)) | ||
| } else { | ||
| this | ||
| } | ||
| } | ||
| } | ||
|
|
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| /** | ||
| * Returns the [transformation][transform] of the [error][Err.error] if this [Result] is [Err], | ||
| * otherwise this [Result]. | ||
| */ | ||
| public inline fun <V, E> Result<V, E>.andThenRecover(transform: (E) -> Result<V, E>): Result<V, E> { | ||
| contract { | ||
| callsInPlace(transform, InvocationKind.AT_MOST_ONCE) | ||
| } | ||
|
|
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| return when (this) { | ||
| is Ok -> this | ||
| is Err -> transform(error) | ||
| } | ||
| } | ||
|
|
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| /** | ||
| * Returns the [transformation][transform] of the [error][Err.error] if this [Result] is [Err] and | ||
| * satisfies the given [predicate], otherwise this [Result]. | ||
| */ | ||
| public inline fun <V, E> Result<V, E>.andThenRecoverIf( | ||
| predicate: (E) -> Boolean, | ||
| transform: (E) -> Result<V, E> | ||
| ): Result<V, E> { | ||
| contract { | ||
| callsInPlace(predicate, InvocationKind.AT_MOST_ONCE) | ||
| callsInPlace(transform, InvocationKind.AT_MOST_ONCE) | ||
| } | ||
|
|
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| return when (this) { | ||
| is Ok -> this | ||
| is Err -> if (predicate(error)) { | ||
| transform(error) | ||
| } else { | ||
| this | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Returns the [transformation][transform] of the [error][Err.error] if this [Result] is [Err] | ||
| * and _does not_ satisfy the given [predicate], otherwise this [Result]. | ||
| */ | ||
| public inline fun <V, E> Result<V, E>.andThenRecoverUnless( | ||
| predicate: (E) -> Boolean, | ||
| transform: (E) -> Result<V, E> | ||
| ): Result<V, E> { | ||
| contract { | ||
| callsInPlace(predicate, InvocationKind.AT_MOST_ONCE) | ||
| callsInPlace(transform, InvocationKind.AT_MOST_ONCE) | ||
| } | ||
|
|
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| return when (this) { | ||
| is Ok -> this | ||
| is Err -> if (!predicate(error)) { | ||
| transform(error) | ||
| } else { | ||
| this | ||
| } | ||
| } | ||
| } |
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