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Merge pull request #22 from mta-solutions/async-extensions
Remove internal scoping and add Async extension methods for validation contexts
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16 changes: 16 additions & 0 deletions
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src/FSharp.Data.Validation.Async/FSharp.Data.Validation.Async.fsproj
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| <Project Sdk="Microsoft.NET.Sdk"> | ||
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| <PropertyGroup> | ||
| <TargetFramework>net6.0</TargetFramework> | ||
| <GenerateDocumentationFile>true</GenerateDocumentationFile> | ||
| </PropertyGroup> | ||
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| <ItemGroup> | ||
| <Compile Include="VCtx.fs" /> | ||
| </ItemGroup> | ||
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| <ItemGroup> | ||
| <ProjectReference Include="..\FSharp.Data.Validation\FSharp.Data.Validation.fsproj" /> | ||
| </ItemGroup> | ||
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| </Project> |
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| namespace FSharp.Data.Validation | ||
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| [<RequireQualifiedAccess>] | ||
| module VCtx = | ||
| /// <summary> | ||
| /// Binds a function that returns an asynchronous computation to a validation context. | ||
| /// </summary> | ||
| /// <remarks> | ||
| /// This function takes a function <c>fn</c> that transforms a value of type <c>'A</c> into an | ||
| /// asynchronous computation of type <c>Async<VCtx<'F, 'B>></c> and a validation context <c>c</c> | ||
| /// of type <c>VCtx<'F, 'A></c>. It returns an asynchronous computation of type <c>Async<VCtx<'F, 'B>></c>. | ||
| /// | ||
| /// The function handles the following cases: | ||
| /// <list type="bullet"> | ||
| /// <item> | ||
| /// <description><c>ValidCtx a</c>: Applies the function <c>fn</c> to <c>a</c> and returns the result.</description> | ||
| /// </item> | ||
| /// <item> | ||
| /// <description><c>RefutedCtx (gfs, lfs)</c>: Returns the same <c>RefutedCtx</c> without applying the function.</description> | ||
| /// </item> | ||
| /// <item> | ||
| /// <description><c>DisputedCtx (gfs, lfs, a)</c>: Applies the function <c>fn</c> to <c>a</c> and merges the results accordingly.</description> | ||
| /// </item> | ||
| /// </list> | ||
| /// </remarks> | ||
| /// <param name="fn">A function that takes a value of type <c>'A</c> and returns an asynchronous computation of type <c>Async<VCtx<'F, 'B>></c>.</param> | ||
| /// <param name="c">A validation context of type <c>VCtx<'F, 'A></c>.</param> | ||
| /// <returns>An asynchronous computation of type <c>Async<VCtx<'F, 'B>></c>.</returns> | ||
| let bindToAsync (fn:'A -> Async<VCtx<'F, 'B>>) (c: VCtx<'F, 'A>): Async<VCtx<'F, 'B>> = | ||
| async { | ||
| match c with | ||
| | ValidCtx a -> return! fn a | ||
| | RefutedCtx (gfs,lfs) -> return RefutedCtx (gfs,lfs) | ||
| | DisputedCtx (gfs,lfs,a) -> | ||
| let! b = fn a | ||
| match b with | ||
| | ValidCtx b -> return DisputedCtx (gfs,lfs,b) | ||
| | DisputedCtx (gfs',lfs',b) -> return DisputedCtx (gfs @ gfs', Utilities.mergeFailures lfs lfs', b) | ||
| | RefutedCtx (gfs',lfs') -> return RefutedCtx (gfs @ gfs', Utilities.mergeFailures lfs lfs') | ||
| } | ||
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| /// <summary> | ||
| /// Binds a function that returns a validation context to an asynchronous computation. | ||
| /// </summary> | ||
| /// <remarks> | ||
| /// This function takes a function <c>fn</c> that transforms a value of type <c>'A</c> into a validation context | ||
| /// of type <c>VCtx<'F, 'B></c> and an asynchronous computation <c>c</c> of type <c>Async<VCtx<'F, 'A>></c>. | ||
| /// It returns an asynchronous computation of type <c>Async<VCtx<'F, 'B>></c>. | ||
| /// </remarks> | ||
| /// <param name="fn">A function that takes a value of type <c>'A</c> and returns a validation context of type <c>VCtx<'F, 'B></c>.</param> | ||
| /// <param name="c">An asynchronous computation of type <c>Async<VCtx<'F, 'A>></c>.</param> | ||
| /// <returns>An asynchronous computation of type <c>Async<VCtx<'F, 'B>></c>.</returns> | ||
| let bindAsync (fn:'A -> Async<VCtx<'F, 'B>>) (c: Async<VCtx<'F, 'A>>): Async<VCtx<'F, 'B>> = | ||
| async { | ||
| let! c' = c | ||
| return! bindToAsync fn c' | ||
| } | ||
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| /// <summary> | ||
| /// Binds a function that returns a validation context to a validation context. | ||
| /// </summary> | ||
| /// <remarks> | ||
| /// This function takes a function <c>fn</c> that transforms a value of type <c>'A</c> into a validation context | ||
| /// of type <c>VCtx<'F, 'B></c> and a validation context <c>c</c> of type <c>VCtx<'F, 'A></c>. | ||
| /// It returns a validation context of type <c>VCtx<'F, 'B></c>. | ||
| /// </remarks> | ||
| /// <param name="fn">A function that takes a value of type <c>'A</c> and returns a validation context of type <c>VCtx<'F, 'B></c>.</param> | ||
| /// <param name="c">A validation context of type <c>VCtx<'F, 'A></c>.</param> | ||
| /// <returns>A validation context of type <c>VCtx<'F, 'B></c>.</returns> | ||
| let bindFromAsync (fn:'A -> VCtx<'F, 'B>) (c: Async<VCtx<'F, 'A>>): Async<VCtx<'F, 'B>> = | ||
| bindAsync (fn >> async.Return) c |
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