version bump: 2.9.0 -> 2.9.1

- ApiResponse: add readToBuffer option to defer/stream body instead of eagerly buffering
- TableDataProvider: implement HTML table parser with per-column provider support
- StealthConfig: add 10s page load timeout and copyCookiesFrom parameter for cookie sharing
- StealthUnitDownloader: catch WebDriverTimeoutException on navigation, log warning instead of throwing
- Bump version to 2.9.0

.idea/.idea.Beam/.idea/indexLayout.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="UserContentModel">
+    <attachedFolders />
+    <explicitIncludes />
+    <explicitExcludes />
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+</project>

.idea/.idea.Beam/.idea/projectSettingsUpdater.xml

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.idea/.idea.Beam/.idea/vcs.xml

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.idea/.idea.Beam/.idea/workspace.xml

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+    <MESSAGE value="Refactor data providers and update abstractions&#10;&#10;- Removed obsolete data providers: `AnchorCollectionDataProvider`, `ContentsDataProvider`, and others, consolidating logic into new composable providers.&#10;- Added `ComposeDataProviders`, `SelectDataProvider`, and `RelationalDataProvider` for improved flexibility and reusability.&#10;- Introduced `IManySelectionComposableDataProvider` interface to support multiple-node selection.&#10;- Enhanced `UnitDownloader` with more robust progress tracking.&#10;- Updated package references and project dependencies for consistency.&#10;- Improved error handling in `StealthConfig` initialization for better fallback on browser drivers.&#10;- Incremented project version to 2.4.5." />
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Beam.Abstractions/Beam.Abstractions.csproj

@@ -0,0 +1,16 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net9.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+        <RootNamespace>Beam.Abstract</RootNamespace>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <PackageReference Include="aeqw89.DataKeys" Version="2.1.1" />
+      <PackageReference Include="aeqw89.PersistentData" Version="1.4.5" />
+      <PackageReference Include="HtmlAgilityPack" Version="1.11.72" />
+    </ItemGroup>
+
+</Project>

Beam.Abstractions/IArticleData.cs

@@ -0,0 +1,10 @@
+namespace Beam.Abstractions;
+
+public interface IArticleData : IDocumentMetaData, IEquatable<IArticleData?> {
+    string? Name { get; set; }
+    string[] Authors { get; set; }
+    string? Language { get; set; }
+    string[] Categories { get; set; }
+    string? Version { get; set; }
+    string? Description { get; set; }
+}

Beam.Abstractions/IComposableDataProvider.cs

@@ -0,0 +1,12 @@
+using HtmlAgilityPack;
+
+namespace Beam.Abstractions;
+
+public interface IComposableDataProvider : IComposableDataProvider<object> { }
+
+
+public interface IComposableDataProvider<out T> : IDataProvider<T> {
+    public T Get(HtmlNode node);
+    public HtmlNode? Select(HtmlDocument doc);
+    public HtmlNode? Select(HtmlNode node);
+}

Beam.Abstractions/IDataBindings.cs

@@ -0,0 +1,25 @@
+namespace Beam.Abstractions;
+
+public interface IDataBindings {
+    IDataProvider<string>? Title { get; set; }
+    IDataProvider<string[]>? Authors { get; set; }
+    IDataProvider<string>? Description { get; set; }
+    IDataProvider<string>? Content { get; set; }
+    IDataProvider<string[]>? Language { get; set; }
+    IDataProvider<string[]>? Tags { get; set; }
+    IDataProvider<string>? Publisher { get; set; }
+    IDataProvider<DateTimeOffset>? PublicationDate { get; set; }
+    IDataProvider<string>? ISBN { get; set; }
+    IDataProvider<int>? PageCount { get; set; }
+    IDataProvider<string>? CoverImage { get; set; }
+    IDataProvider<string[]>? Series { get; set; }
+    IDataProvider<int>? Edition { get; set; }
+    IDataProvider<string[]>? Contributors { get; set; }
+    IDataProvider<string[]>? Subjects { get; set; }
+    IDataProvider<string>? Rights { get; set; }
+    IDataProvider<string[]>? TableOfContents { get; set; }
+    IDataProvider<string[]>? PagesDropDown { get; set; }
+    IDataProvider<string>? NextPageButton { get; set; }
+    IDataProvider<string>? PreviousPageButton { get; set; }
+    Dictionary<string, IDataProvider?> Providers { get; set; }
+}

Beam.Abstractions/IDataProvider.cs

@@ -0,0 +1,13 @@
+using HtmlAgilityPack;
+
+namespace Beam.Abstractions;
+
+public interface IDataProvider {
+    public string GetString(HtmlDocument document)
+        => (this as IDataProvider<object>)?.Get(document)?.ToString() ?? "";
+}
+
+public interface IDataProvider<out T> : IDataProvider {
+    public T Get(HtmlDocument document);
+    //public HtmlNode? GetNode(HtmlDocument document);
+}

Beam.Abstractions/IDocument.cs

@@ -0,0 +1,28 @@
+using aeqw89.DataKeys;
+
+namespace Beam.Abstractions;
+
+public interface IDocument {
+    /// <summary>
+    /// The file name of the document. Must be valid in both <c>UNIX</c>, 
+    /// <c>WINDOWS</c>, <c>APPLE</c>, and <c>ANDROID</c> file systems.
+    /// </summary>
+    string Filename { get; }
+
+    /// <summary>
+    /// Additional descriptive data
+    /// </summary>
+    IDictionary<IDataKey<IDocumentMetaData>, IDocumentMetaData> MetaData { get; }
+
+    /// <summary>
+    /// Retrieves the binary representation for the <see cref="IDocument"/>
+    /// </summary>
+    /// <returns>Binary representation of the <see cref="IDocument"/></returns>
+    byte[] ToBytes();
+
+    /// <summary>
+    /// Retrieves the string representation for the <see cref="IDocument"/>
+    /// </summary>
+    /// <returns>String representation of the <see cref="IDocument"/></returns>
+    string ToString();
+}

Beam.Abstractions/IDocumentMetaData.cs

@@ -0,0 +1,7 @@
+using System.Text.Json;
+
+namespace Beam.Abstractions;
+
+public interface IDocumentMetaData {
+    string AsJson(JsonSerializerOptions? options = null);
+}

Beam.Abstractions/IDownloadReport.cs

@@ -0,0 +1,6 @@
+namespace Beam.Abstractions;
+
+public interface IDownloadReport {
+    long BytesDownloaded { get; init; }
+    long? BytesRemaining { get; init; }
+}

Beam.Abstractions/ILinkBuilder.cs

@@ -0,0 +1,9 @@
+namespace Beam.Abstractions;
+
+public interface ILinkBuilder {
+    /// <summary>
+    /// Produces a concrete <see cref="SourceLink"/> using values from an external <see cref="State"/> object.
+    /// </summary>
+    /// <param name="parameterValues">Object providing positional values.</param>
+    string Build(IReadOnlyState parameterValues);
+}

Beam.Abstractions/IManySelectionComposableDataProvider.cs

@@ -0,0 +1,9 @@
+using HtmlAgilityPack;
+
+namespace Beam.Abstractions;
+
+public interface IManySelectionComposableDataProvider<out T> : IDataProvider<T> {
+    public T ManyGet(HtmlNode[] node);
+    public HtmlNode[]? SelectMany(HtmlDocument doc);
+    public HtmlNode[]? SelectMany(HtmlNode[] node);
+}

Beam.Abstractions/IOrdered.cs

@@ -0,0 +1,6 @@
+namespace Beam.Abstractions;
+
+public interface IOrdered<out T> {
+    T Data { get; }
+    int Order { get; }
+}

Beam.Abstractions/IReadOnlyState.cs

@@ -0,0 +1,6 @@
+namespace Beam.Abstractions;
+
+public interface IReadOnlyState {
+    public ReadOnlySpan<string> GetState();
+    IState Copy();
+}

Beam.Abstractions/IResourceDictionary.cs

@@ -0,0 +1,3 @@
+namespace Beam.Abstractions;
+
+public interface IResourceDictionary { }

Beam.Abstractions/IRetryReport.cs

@@ -0,0 +1,6 @@
+namespace Beam.Abstractions;
+
+public interface IRetryReport {
+    int TryNumber { get; }
+    string Link { get; }
+}

Beam.Abstractions/IState.cs

@@ -0,0 +1,9 @@
+namespace Beam.Abstractions;
+
+public interface IState {
+    
+    string[] GetState();
+    void SetState(string[] state);
+    new IState Copy();
+    IReadOnlyState AsReadOnly();
+}

Beam.Abstractions/IStateChangeBehaviour.cs

@@ -0,0 +1,8 @@
+namespace Beam.Abstractions;
+
+/// <summary>
+/// Defines how a url template should should be updated, in what order, and by how much
+/// </summary>
+public interface IStateChangeBehaviour {
+    public void Apply(IState state, object stimulus);
+}

Beam.Abstractions/IStateChangerFactory.cs

@@ -0,0 +1,5 @@
+namespace Beam.Abstractions;
+
+public interface IStateChangerFactory {
+    IStateChangeBehaviour Behavior { get; }
+}

Beam.Abstractions/ITemplate.cs

@@ -0,0 +1,8 @@
+using aeqw89.DataKeys;
+
+namespace Beam.Abstractions;
+
+public interface ITemplate : IKeyed<ITemplate> {
+    IStateChangerFactory Factory { get; set; }
+    ILinkBuilder Builder { get; set; }
+}

Beam.Abstractions/IUnitDownloader.cs

@@ -0,0 +1,7 @@
+
+namespace Beam.Abstractions;
+
+public interface IUnitDownloader<T> {
+    public int LinksPerDownload { get; }
+    public Task<(bool, T?)> TryDownload(IOrdered<string>[] link, CancellationToken ct, int maximumRetryCount = 7, IProgress<IDownloadReport>? downProgress = null, IProgress<IRetryReport>? tryProgress = null);
+}

Beam.Api/ApiCall.cs

@@ -3,12 +3,14 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Net;
+using System.Net.Http;
 using System.Net.Http.Json;
 using System.Text;
 using System.Text.Json;
+using System.Threading;
 using System.Threading.Tasks;
 
-namespace Beam {
+namespace Beam.Api; 
     public class ApiCall(HttpClient client, string uri, HttpMethod method, KeyValuePair<string, string[]>[] headers, object? requestData, object? body, params HashSet<HttpStatusCode> successCodes) {
         public HttpClient Client { get; } = client;
         public object? RequestData { get; } = requestData;
@@ -20,7 +22,7 @@ namespace Beam {
 
         private string? ContentType = "application/json";
 
-        public async Task<ApiResponse> GetResponse(ILogger<ApiResponse>? logger, (int @try, int max)? tries = null, CancellationToken ct = default) {
+        public async Task<ApiResponse> GetResponse(ILogger<ApiResponse>? logger, (int @try, int max)? tries = null, bool readToBuffer = true, CancellationToken ct = default) {
             SanitizeHeaders();
             
             var request = new HttpRequestMessage(Method, Uri);
@@ -33,15 +35,16 @@ namespace Beam {
             foreach (var header in Headers)
                 request.Headers.Add(header.Key, header.Value);
             
+            
             logger?.LogInformation("Fetching '{}' with method '{}', content-type '{}', and headers '{}'", Uri, Method, ContentType, JsonSerializer.Serialize(request.Headers.ToDictionary()));
-            var response = await Client.SendAsync(request, ct);
+            var response = await Client.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, ct);
 
             if (tries is not null && tries?.@try < tries?.max && !SuccessCodes.Contains(response.StatusCode)) {
                 await Task.Delay((int)Math.Min(Math.Pow(2, tries.Value.@try), 60) * 1000, ct);
-                return await GetResponse(logger, (tries.Value.@try + 1, tries.Value.max), ct);
+                return await GetResponse(logger, (tries.Value.@try + 1, tries.Value.max), readToBuffer, ct);
             }
 
-            return await ApiResponse.CreateAsync(response, logger, RequestData, ct);
+            return await ApiResponse.CreateAsync(response, logger, RequestData, readToBuffer, ct);
         }
 
         private void SanitizeHeaders() {
@@ -63,4 +66,3 @@ namespace Beam {
         public static async Task<ApiResponse> Get(HttpClient client, string url, ILoggerFactory factory)
             => await new ApiCall(client, url, HttpMethod.Get, [], null, null).GetResponse(factory.CreateLogger<ApiResponse>());
     }
-}

Beam.Api/ApiCallBuilder.cs

@@ -2,11 +2,12 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Net;
+using System.Net.Http;
 using System.Reflection.PortableExecutable;
 using System.Text;
 using System.Threading.Tasks;
 
-namespace Beam {
+namespace Beam.Api;
     public class ApiCallBuilder(HttpClient client) {
         HttpClient Client = client;
         string Uri;
@@ -25,10 +26,6 @@ namespace Beam {
             return WithUri(uri.AbsoluteUri);
         }
 
-        public ApiCallBuilder WithUri(SourceLink uri) {
-            return WithUri(uri.Link);
-        }
-
         public ApiCallBuilder WithRequestData(object? data) {
             Data = data;
             return this;
@@ -81,4 +78,4 @@ namespace Beam {
             return new ApiCall(Client, Uri, Method, Headers.Select((x) => new KeyValuePair<string, string[]>(x.Key, x.Value.ToArray())).ToArray(), Data, Body, SuccessCodes);
         }
     }
-}
+

Beam.Api/ApiCalls.cs

@@ -1,9 +1,15 @@
 // ApiCalls.cs
+
+using System;
 using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.Linq;
 using System.Net;
+using System.Threading;
+using System.Threading.Tasks;
 using Microsoft.Extensions.Logging;
 
-namespace Beam {
+namespace Beam.Api;
     /// <summary>
     /// Executes a batch of <see cref="ApiCall"/>s using either sequential or parallel strategy.
     /// </summary>
@@ -27,7 +33,7 @@ namespace Beam {
                 // sequential
                 var sequential = new List<ApiResponse>(_calls.Count);
                 foreach (var call in _calls)
-                    sequential.Add(await call.GetResponse(logger, tries, ct));
+                    sequential.Add(await call.GetResponse(logger, tries, true, ct));
                 return sequential;
             }
 
@@ -37,7 +43,7 @@ namespace Beam {
                 _calls.Select((c, i) => (call: c, idx: i)),
                 new ParallelOptions { MaxDegreeOfParallelism = _maxDegree, CancellationToken = ct },
                 async (item, token) => {
-                    var response = await item.call.GetResponse(logger, tries, token);
+                    var response = await item.call.GetResponse(logger, tries, true, token);
                     bag.Add((item.idx, response));
                 });
 
@@ -45,4 +51,4 @@ namespace Beam {
             return bag.OrderBy(x => x.idx).Select(x => x.res).ToList();
         }
     }
-}
+

Beam.Api/ApiCallsBuilder.cs

@@ -1,7 +1,10 @@
 // ApiCallsBuilder.cs
+
+using System;
+using System.Collections.Generic;
 using System.Net;
 
-namespace Beam {
+namespace Beam.Api;
     /// <summary>
     /// Fluent builder for <see cref="ApiCalls"/>.
     /// </summary>
@@ -43,5 +46,4 @@ namespace Beam {
                 throw new InvalidOperationException("At least one ApiCall is required.");
             return new ApiCalls(_calls, _parallelism);
         }
-    }
+    }
-}

Beam.Api/ApiResponse.cs

@@ -1,19 +1,26 @@
-using Microsoft.Extensions.Logging;
+using System;
+using System.IO;
+using Microsoft.Extensions.Logging;
 using System.Net;
+using System.Net.Http;
 using System.Net.Http.Json;
 using System.Text;
 using System.Text.Json;
+using System.Threading;
+using System.Threading.Tasks;
 
-namespace Beam { 
+namespace Beam.Api;
     /// <summary>
     /// Wrapper that lets the response body be read any number of times (even concurrently).
     /// </summary>
     public sealed class ApiResponse {
-        private readonly byte[] _buffer;
+        private byte[] _buffer;
+        private bool _read_has_been_deferred;
 
         private ApiResponse(HttpResponseMessage response, byte[] buffer, ILogger<ApiResponse>? logger, object? requestData = null) {
             Response = response;
             _buffer = buffer;
+            _read_has_been_deferred = _buffer.Length == 0;
             Logger = logger;
             RequestData = requestData;
         }
@@ -28,8 +35,10 @@ namespace Beam {
             HttpResponseMessage response,
             ILogger<ApiResponse>? logger = null,
             object? requestData = null,
+            bool readToBuffer = true,
             CancellationToken ct = default) {
             if (response is null) throw new ArgumentNullException(nameof(response));
+            if (!readToBuffer) return new ApiResponse(response, [], logger, requestData);
 
             var buffer = response.Content is null
                 ? []
@@ -50,33 +59,54 @@ namespace Beam {
             if (!Is200) errorHandler(Response.StatusCode);
             return this;
         }
-
         /* ---------- content helpers ---------- */
 
-        public Task<T?> AsSerializedObject<T>(CancellationToken ct = default) {
+        private async Task ReadToBuffer(CancellationToken ct = default) {
+            if (!_read_has_been_deferred) return;
+            _buffer = Response.Content is null
+                ? []
+                : await Response.Content.ReadAsByteArrayAsync(ct).ConfigureAwait(false);
+            _read_has_been_deferred = false;
+        }
+
+        public async Task<T?> AsSerializedObject<T>(CancellationToken ct = default) {
             if (!Is200) throw new InvalidOperationException();
             if (Response.Content?.Headers.ContentType?.MediaType != "application/json")
                 Logger?.LogWarning("Content-Type is not JSON, yet JSON deserialization was requested.");
 
-            return Task.FromResult(JsonSerializer.Deserialize<T>(_buffer));
+            if (_read_has_been_deferred) {
+                return await JsonSerializer.DeserializeAsync<T>(await Response.Content!.ReadAsStreamAsync(ct), (JsonSerializerOptions?)null, ct);
+            } else {
+                return JsonSerializer.Deserialize<T>(_buffer);
+            }
         }
 
         public Task<T?> AsDynamicObject<T>(T _, CancellationToken ct = default)
             => AsSerializedObject<T>(ct);
 
-        public Task<string> AsString(CancellationToken ct = default) {
+        public async Task<string> AsString(CancellationToken ct = default) {
             if (!Is200) Logger?.LogWarning("Non-success response; attempting to read content.");
-            return Task.FromResult(Encoding.UTF8.GetString(_buffer));
+            if (_read_has_been_deferred) {
+                await ReadToBuffer(ct);
+            }
+
+            return Encoding.UTF8.GetString(_buffer);
         }
 
-        public Task<byte[]> AsBinary(CancellationToken ct = default) {
+        public async Task<byte[]> AsBinary(CancellationToken ct = default) {
             if (!Is200) Logger?.LogWarning("Non-success response; attempting to read content.");
-            return Task.FromResult(_buffer);
+            if (_read_has_been_deferred) {
+                await ReadToBuffer(ct);
+            }
+            return _buffer;
         }
 
-        public Task<Stream> AsStream(CancellationToken ct = default) {
+        public async Task<Stream> AsStream(CancellationToken ct = default) {
             if (!Is200) Logger?.LogWarning("Non-success response; attempting to read content.");
-            return Task.FromResult<Stream>(new MemoryStream(_buffer, writable: false));
+            if (_read_has_been_deferred) {
+                return await Response.Content!.ReadAsStreamAsync(ct);
+            } else {
+                return new MemoryStream(_buffer, writable: false);
+            }
         }
-    }
 }

Beam.Api/Beam.Api.csproj

@@ -0,0 +1,17 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net9.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <PackageReference Include="Microsoft.Extensions.Logging" Version="9.0.9" />
+    </ItemGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\Beam.Abstractions\Beam.Abstractions.csproj" />
+    </ItemGroup>
+
+</Project>

Beam.Api/Beam.Api.csproj.bak

@@ -0,0 +1,17 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net9.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <PackageReference Include="Microsoft.Extensions.Logging" Version="9.0.9" />
+    </ItemGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\Beam.Abstractions\Beam.Abstractions.csproj" />
+    </ItemGroup>
+
+</Project>

Beam.Data/Beam.Data.csproj

@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net9.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\Beam.Dynamic\Beam.Dynamic.csproj" />
+      <ProjectReference Include="..\Beam.Models\Beam.Models.csproj" />
+    </ItemGroup>
+
+</Project>

Beam.Data/BeamDataContext.cs

@@ -0,0 +1,50 @@
+using aeqw89.DataKeys;
+using aeqw89.PersistentData;
+using Beam.Dynamic;
+using Beam.Models;
+
+namespace Beam.Data {
+    using BeamFile = Models.File;
+    
+    public class BeamDataContext : BaseDataDictionary {
+        #region  Tables
+        public Table<Template> Templates {
+            get => GetOrCreateTable<Template>(nameof(Templates));
+            set => Set(nameof(Templates), value);
+        }
+        
+        public Table<DataBindings> Bindings {
+            get => GetOrCreateTable<DataBindings>(nameof(Bindings));
+            set => Set(nameof(Bindings), value);
+        }
+        public Table<WebResource> Resources {
+            get => GetOrCreateTable<WebResource>(nameof(Resources));
+            set => Set(nameof(Resources), value);
+        }
+        public Table<ResourceDictionary> ResourceDictionaries {
+            get => GetOrCreateTable<ResourceDictionary>(nameof(ResourceDictionaries));
+            set => Set(nameof(ResourceDictionaries), value);
+        }
+        public Table<ImmutableState> InitialStates {
+            get => GetOrCreateTable<ImmutableState>(nameof(InitialStates));
+            set => Set(nameof(InitialStates), value);
+        }
+        public Table<BeamFile> Files {
+            get => GetOrCreateTable<BeamFile>(nameof(Files));
+            set => Set(nameof(Files), value);
+        }
+        #endregion
+        #region Junctions
+        public Junction<WebResource, ResourceDictionary> WebResourceToResourceDictionaryJunction {
+            get => GetOrCreateJunction<WebResource, ResourceDictionary>(nameof(WebResourceToResourceDictionaryJunction));
+            set => Set(nameof(WebResourceToResourceDictionaryJunction), value);
+        }
+        #endregion
+        #region Computed
+        public Dictionary<DataKey<WebResource>, ResourceDictionary[]> ResourceDictionariesByNovel =>
+            Resources.Keys.ToDictionary(x => x,
+                x => WebResourceToResourceDictionaryJunction[x].Select(y => ResourceDictionaries[y]).ToArray());
+
+        #endregion
+    }
+}

Beam.Data/LinkBuilder.cs

@@ -1,10 +1,9 @@
-using System;
+using System.Text;
-using System.Collections.Generic;
+using Beam.Abstractions;
-using System.Linq;
+using Beam.Models;
-using System.Text;
+using static Beam.Exceptions.Exceptions;
-using System.Threading.Tasks;
 
-namespace Beam {
+namespace Beam.Data {
     /// <summary>
     /// Describes where a <see cref="Parameter"/> token should be inserted relative to the run‑time value
     /// that ultimately replaces it when building a <see cref="SourceLink"/>.
@@ -129,7 +128,7 @@ namespace Beam {
     /// </remarks>
     /// <param name="host">DNS host name (e.g. <c>api.example.com</c>).</param>
     /// <param name="protocol">Transport protocol; defaults to <c>https</c>.</param>
-    public class SourceLinkBuilder(string host, string protocol = "https") {
+    public class LinkBuilder(string host, string protocol = "https") : ILinkBuilder {
         /// <summary>
         /// Gets or sets the scheme part of the URL (e.g. <c>https</c>, <c>http</c>).
         /// </summary>
@@ -148,8 +147,8 @@ namespace Beam {
         /// <summary>
         /// Produces a deep copy whose <see cref="Segments"/> and contained collections are detached from the original.
         /// </summary>
-        public SourceLinkBuilder Clone()
+        public LinkBuilder Clone()
-            => new SourceLinkBuilder(Host, Protocol) {
+            => new LinkBuilder(Host, Protocol) {
                 Segments = [.. Segments.Select(static x => x.Clone())]
             };
 
@@ -241,7 +240,7 @@ namespace Beam {
         /// Replaces the whole <see cref="Segments"/> collection with the supplied <paramref name="segments"/>, each represented as a <see cref="LinkSegment"/>.
         /// </summary>
         /// <returns>This instance for fluent calls.</returns>
-        public SourceLinkBuilder WithSegments(params IEnumerable<string> segments) {
+        public LinkBuilder WithSegments(params IEnumerable<string> segments) {
             Segments = segments.Select(static x => new LinkSegment(x)).ToList();
             return this;
         }
@@ -250,7 +249,7 @@ namespace Beam {
         /// Replaces the <see cref="Segments"/> collection with <paramref name="count"/> empty segments.
         /// </summary>
         /// <param name="count">Number of segments to create.</param>
-        public SourceLinkBuilder WithSegments(int count)
+        public LinkBuilder WithSegments(int count)
             => WithSegments(Enumerable.Repeat("", count));
         #endregion
 
@@ -258,7 +257,7 @@ namespace Beam {
         /// <summary>
         /// Replaces parameters of the <paramref name="i"/>‑th segment using the supplied identifiers.
         /// </summary>
-        public SourceLinkBuilder WithParameters(int i, params string[] parameters) {
+        public LinkBuilder WithParameters(int i, params string[] parameters) {
             Segments[i].WithParameters(parameters);
             return this;
         }
@@ -266,7 +265,7 @@ namespace Beam {
         /// <summary>
         /// Replaces parameters of the <paramref name="i"/>‑th segment using explicit name/position tuples.
         /// </summary>
-        public SourceLinkBuilder WithParameters(int i, params (string, Position)[] parameters) {
+        public LinkBuilder WithParameters(int i, params (string, Position)[] parameters) {
             Segments[i].WithParameters(parameters);
             return this;
         }
@@ -325,12 +324,15 @@ namespace Beam {
             return count;
         }
 
+        public string Build(IReadOnlyState state)
+            => Build(state.GetState().ToArray().ToArray<object>());
+
         #region Build
         /// <summary>
         /// Produces a concrete <see cref="SourceLink"/> using values from an external <see cref="State"/> object.
         /// </summary>
         /// <param name="parameterValues">Object providing positional values.</param>
-        public SourceLink Build(State parameterValues)
+        public string Build(State parameterValues)
             => Build(parameterValues.GetState());
 
         /// <summary>
@@ -339,7 +341,7 @@ namespace Beam {
         /// <param name="parameterValues">Flat array of values that will be written in the order that parameters appear when segments are enumerated left‑to‑right. Any optional parameters must still appear as null if missing.</param>
         /// <returns>The completed <see cref="SourceLink"/>.</returns>
         /// <exception cref="ArgumentOutOfRangeException">If the supplied value count does not match <see cref="GetParameterCount"/>().</exception>
-        public SourceLink Build(params object?[] parameterValues) {
+        public string Build(params object?[] parameterValues) {
             ArgumentOutOfRangeException.ThrowIfNotEqual(parameterValues.Length, GetParameterCount());
 
             StringBuilder link = new();
@@ -357,10 +359,10 @@ namespace Beam {
                         if (segment.Parameters[i].Position.HasFlag(Position.Optional))
                             continue;
                         else
-                            throw new ArgumentException(S.M.RequiredArgumentMissing);
+                            throw new ArgumentException(string.Format(link_builder_argument_missing, pvC, segment.Parameters[i].Name));
 
                     if (segment.Parameters[i].Position.HasFlag(Position.Query) && Segments[^1] != segment)
-                            throw new ArgumentException(S.M.QueryParametersOnlyAtLastSegment);
+                            throw new ArgumentException(string.Format(link_builder_query_only_at_last, i));
 
                     if (segment.Parameters[i].Position.HasFlag(Position.Query))
                         if (!startedQueryString) {
@@ -378,10 +380,10 @@ namespace Beam {
                     if (parameterValues[pvC] is not null)
                         link.Append(parameterValues[pvC++]);
                     else if (!segment.Parameters[i].Position.HasFlag(Position.Optional))
-                        throw new ArgumentException(S.M.RequiredArgumentMissing);
+                        throw new ArgumentException(string.Format(link_builder_argument_missing, pvC, segment.Parameters[i].Name));
 
                     if (segment.Parameters[i].Position.HasFlag(Position.Query | Position.After))
-                        throw new ArgumentException(S.M.QueryFlagIncompatibleWithAfterFlag);
+                        throw new ArgumentException(string.Format(link_builder_incompatible_flag, nameof(Position.Query), nameof(Position.After)));
 
                     if (segment.Parameters[i].Position.HasFlag(Position.After))
                         link.Append(segment.Parameters[i].Name);
@@ -393,7 +395,7 @@ namespace Beam {
                 link.Append(segment.Suffix);
             }
 
-            return new SourceLink(link.ToString());
+            return link.ToString();
         }
         #endregion
     }

Beam.Data/ResourceDictionary.cs

@@ -1,16 +1,10 @@
-
+using System.Text.Json.Serialization;
-
 using aeqw89.DataKeys;
-using System;
+using Beam.Abstractions;
-using System.Collections.Generic;
+using Beam.Models;
-using System.Diagnostics;
-using System.Linq;
-using System.Text;
-using System.Text.Json.Serialization;
-using System.Threading.Tasks;
 
-namespace Beam.Models {
+namespace Beam.Data {
-    public class ResourceDictionary : IKeyed<ResourceDictionary> {
+    public class ResourceDictionary : IKeyed<ResourceDictionary>, IResourceDictionary {
         public required DataKey<ResourceDictionary> Key { get; set; }
 
         [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]

Beam.Data/Template.cs

@@ -0,0 +1,19 @@
+using aeqw89.DataKeys;
+using Beam.Abstractions;
+using Beam.Dynamic;
+
+namespace Beam.Data {
+    public record class Template : ITemplate {
+        public required DataKey<ITemplate> Key { get; set; }
+        public required StateChangerFactory Factory { get; set; }
+        IStateChangerFactory ITemplate.Factory {
+            get => Factory;
+            set => Factory = (StateChangerFactory)value;
+        }
+        public required LinkBuilder Builder { get; set; }
+        ILinkBuilder ITemplate.Builder {
+            get => Builder;
+            set => Builder = (LinkBuilder)value;
+        }
+    }
+}

Beam.Data/WebResource.cs

@@ -1,13 +1,7 @@
-using aeqw89.PersistentData;
+using aeqw89.DataKeys;
-using aeqw89.DataKeys;
 using Beam.Dynamic;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace Beam.Models {
+namespace Beam.Data {
     /// <summary>
     /// Represents a specific resource accessible online; e.g. a book's contents.
     /// </summary>

Beam.Downloaders/Beam.Downloaders.csproj

@@ -0,0 +1,21 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net9.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\Beam.Abstractions\Beam.Abstractions.csproj" />
+      <ProjectReference Include="..\Beam.Exceptions\Beam.Exceptions.csproj" />
+      <ProjectReference Include="..\Beam.Models\Beam.Models.csproj" />
+    </ItemGroup>
+
+    <ItemGroup>
+      <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="9.0.9" />
+      <PackageReference Include="System.IO.Hashing" Version="10.0.0" />
+      <PackageReference Include="System.Linq.Async" Version="6.0.3" />
+    </ItemGroup>
+
+</Project>

Beam.Downloaders/DownloadContext.cs

@@ -1,42 +1,34 @@
-using HtmlAgilityPack;
+using Beam.Abstractions;
-using System;
+using Beam.Models;
-using System.Collections.Concurrent;
+using HtmlAgilityPack;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 using Microsoft.Extensions.Logging;
 
-namespace Beam {
+namespace Beam.Downloaders {
     //public delegate T HtmlTransformer<out T>(HtmlDocument doc);
-    public delegate Task<U> AsyncTransformer<in T, U>(T elem);
     //public delegate Task<T> AsyncHtmlTransformer<T>(HtmlDocument doc);
     //public delegate Task<T> AsyncBinaryTransformer<T>(byte[] bin);
 
-    public class DownloadContext<RawType> : IDisposable {
+    public class DownloadContext {
         private bool disposedValue;
-
+        
-        public DownloadContextBuilder<RawType> CreateBuilder()
-            => DownloadContextBuilder<RawType>.FromContext(this);
-
         public HttpClient Client { get; }
         public HtmlWeb Web { get; }
-        public IProgress<DownloadReport>? DownloadReporter { get; set; }
+        public IProgress<IDownloadReport>? DownloadReporter { get; set; }
-        public IProgress<RetryReport>? RetryReporter { get; set; }
+        public IProgress<IRetryReport>? RetryReporter { get; set; }
-        public AsyncDownloadFailurePredicate<RawType>?[]? AsyncFailurePredicates { get;  }
+        public AsyncDownloadFailurePredicate<ByteDocument>?[]? AsyncFailurePredicates { get;  }
         public TimeSpan TimeOut { get; set; }
-        public IEnumerable<SourceLink> Links { get; }
+        public IEnumerable<string> Links { get; }
         public CancellationToken CancellationToken { get; }
         public DocumentCache Cache { get; private set; } = [];
         public ILogger? DownloadLogger { get; set; }
 
         public DownloadContext(HtmlWeb web,
                                HttpClient client,
-                               IEnumerable<SourceLink> links,
+                               IEnumerable<string> links,
                                CancellationToken cancellationToken = default,
-                               IProgress<DownloadReport>? downloadReporter = null,
+                               IProgress<IDownloadReport>? downloadReporter = null,
-                               IProgress<RetryReport>? retryReporter = null,
+                               IProgress<IRetryReport>? retryReporter = null,
-                               AsyncDownloadFailurePredicate<RawType>?[]? asyncFailurePredicates = null,
+                               AsyncDownloadFailurePredicate<ByteDocument>?[]? asyncFailurePredicates = null,
                                TimeSpan? timeOut = null,
                                ILogger? downloadLogger = null) {
             ArgumentNullException.ThrowIfNull(web, nameof(web));

Beam.Downloaders/DownloadContextBuilder.cs

@@ -1,21 +1,18 @@
-using HtmlAgilityPack;
+using Beam.Abstractions;
+using Beam.Models;
+using HtmlAgilityPack;
 using Microsoft.Extensions.Logging;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace Beam {
+namespace Beam.Downloaders {
 
-    public class DownloadContextBuilder<RawType> {
+    public class DownloadContextBuilder {
         private HtmlWeb _web;
         private HttpClient _client;
-        private IProgress<DownloadReport>? _downloadReporter;
+        private IProgress<IDownloadReport>? _downloadReporter;
-        private IProgress<RetryReport>? _retryReporter;
+        private IProgress<IRetryReport>? _retryReporter;
-        private AsyncDownloadFailurePredicate<RawType>?[] _asyncFailurePredicates = [];
+        private AsyncDownloadFailurePredicate<ByteDocument>?[] _asyncFailurePredicates = [];
         private TimeSpan _timeOut;
-        private IEnumerable<SourceLink> _links;
+        private IEnumerable<string> _links;
         private CancellationToken _cancellationToken;
         private DocumentCache _cache;
         private ILogger? _downloadLogger;
@@ -29,60 +26,60 @@ namespace Beam {
             _links = [];
         }
 
-        public DownloadContextBuilder<RawType> WithWeb(HtmlWeb web) {
+        public DownloadContextBuilder WithWeb(HtmlWeb web) {
             _web = web;
             return this;
         }
 
-        public DownloadContextBuilder<RawType> WithClient(HttpClient client) {
+        public DownloadContextBuilder WithClient(HttpClient client) {
             _client = client;
             return this;
         }
 
-        public DownloadContextBuilder<RawType> WithDownloadReporter(IProgress<DownloadReport> downloadReporter) {
+        public DownloadContextBuilder WithDownloadReporter(IProgress<IDownloadReport> downloadReporter) {
             _downloadReporter = downloadReporter;
             return this;
         }
 
-        public DownloadContextBuilder<RawType> WithRetryReporter(IProgress<RetryReport> retryReporter) {
+        public DownloadContextBuilder WithRetryReporter(IProgress<IRetryReport> retryReporter) {
             _retryReporter = retryReporter;
             return this;
         }
 
-        public DownloadContextBuilder<RawType> WithAsyncFailurePredicates(params AsyncDownloadFailurePredicate<RawType>[] predicates) {
+        public DownloadContextBuilder WithAsyncFailurePredicates(params AsyncDownloadFailurePredicate<ByteDocument>[] predicates) {
             _asyncFailurePredicates = predicates;
             return this;
         }
 
-        public DownloadContextBuilder<RawType> WithTimeOut(TimeSpan timeOut) {
+        public DownloadContextBuilder WithTimeOut(TimeSpan timeOut) {
             _timeOut = timeOut;
             return this;
         }
 
-        public DownloadContextBuilder<RawType> WithLinks(IEnumerable<SourceLink> links) {
+        public DownloadContextBuilder WithLinks(IEnumerable<string> links) {
             _links = links;
             return this;
         }
 
-        public DownloadContextBuilder<RawType> WithCancellationToken(CancellationToken cancellationToken) {
+        public DownloadContextBuilder WithCancellationToken(CancellationToken cancellationToken) {
             _cancellationToken = cancellationToken;
             return this;
         }
 
-        public DownloadContextBuilder<RawType> WithCache(DocumentCache cache) {
+        public DownloadContextBuilder WithCache(DocumentCache cache) {
             _cache = cache;
             return this;
         }
 
-        public DownloadContextBuilder<RawType> WithDownloadLogger(ILogger downloadLogger) {
+        public DownloadContextBuilder WithDownloadLogger(ILogger downloadLogger) {
             _downloadLogger = downloadLogger;
             return this;
         }
 
 
-        public DownloadContext<RawType> Build() {
+        public DownloadContext Build() {
             // Construct the DownloadContext<T> using the collected values.
-            var context = new DownloadContext<RawType>(
+            var context = new DownloadContext(
                 web: _web,
                 client: _client,
                 links: _links,
@@ -103,15 +100,15 @@ namespace Beam {
             return context;
         }
 
-        public static DownloadContextBuilder<RawType> FromContext(DownloadContext<RawType> existing) {
+        public static DownloadContextBuilder FromContext(DownloadContext existing) {
             if (existing == null) throw new ArgumentNullException(nameof(existing));
 
-            return new DownloadContextBuilder<RawType>(existing.Client, existing.Web)
+            return new DownloadContextBuilder(existing.Client, existing.Web)
                 .WithLinks(existing.Links)
                 .WithCancellationToken(existing.CancellationToken)
                 .WithDownloadReporter(existing.DownloadReporter!)
                 .WithRetryReporter(existing.RetryReporter!)
-                .WithAsyncFailurePredicates(existing.AsyncFailurePredicates ?? Array.Empty<AsyncDownloadFailurePredicate<RawType>>())
+                .WithAsyncFailurePredicates(existing.AsyncFailurePredicates ?? Array.Empty<AsyncDownloadFailurePredicate<ByteDocument>>())
                 .WithTimeOut(existing.TimeOut)
                 .WithDownloadLogger(existing.DownloadLogger!)
                 .WithCache(existing.Cache);

Beam.Downloaders/FailurePredicateOptions.cs

@@ -0,0 +1,9 @@
+using Beam.Models;
+
+namespace Beam.Downloaders;
+
+public record class FailurePredicateOptions<RawType> {
+    public required AsyncDownloadFailurePredicate<RawType>?[]? AsyncDownloadFailurePredicates { get; init; }
+    public bool ProcessInParallel { get; init; } = false;
+    public int? ParallelThreads { get; init; }
+}

Beam.Downloaders/FailurePredicateOptionsBuilder.cs

@@ -0,0 +1,56 @@
+using Beam.Models;
+
+namespace Beam.Downloaders;
+
+public sealed class FailurePredicateOptionsBuilder<TRaw>
+{
+    private readonly System.Collections.Generic.List<AsyncDownloadFailurePredicate<TRaw>?> _predicates =
+        new System.Collections.Generic.List<AsyncDownloadFailurePredicate<TRaw>?>();
+    private bool _processInParallel = false;
+    private int? _parallelThreads = null;
+
+    public FailurePredicateOptionsBuilder<TRaw> WithPredicate(AsyncDownloadFailurePredicate<TRaw>? predicate)
+    {
+        _predicates.Add(predicate);
+        return this;
+    }
+
+    public FailurePredicateOptionsBuilder<TRaw> WithPredicates(System.Collections.Generic.IEnumerable<AsyncDownloadFailurePredicate<TRaw>?> predicates)
+    {
+        if (predicates == null) throw new System.ArgumentNullException(nameof(predicates));
+        _predicates.AddRange(predicates);
+        return this;
+    }
+
+    public FailurePredicateOptionsBuilder<TRaw> WithPredicates(params AsyncDownloadFailurePredicate<TRaw>?[] predicates)
+    {
+        _predicates.Clear();
+        if (predicates != null) _predicates.AddRange(predicates);
+        return this;
+    }
+
+    public FailurePredicateOptionsBuilder<TRaw> WithProcessInParallel(bool value = true)
+    {
+        _processInParallel = value;
+        return this;
+    }
+
+    public FailurePredicateOptionsBuilder<TRaw> WithParallelThreads(int? threads)
+    {
+        if (threads.HasValue && threads.Value <= 0)
+            throw new System.ArgumentOutOfRangeException(nameof(threads));
+        _parallelThreads = threads;
+        return this;
+    }
+
+    public FailurePredicateOptions<TRaw> Build()
+    {
+        var arr = _predicates.Count == 0 ? [] : _predicates.ToArray();
+        return new FailurePredicateOptions<TRaw>
+        {
+            AsyncDownloadFailurePredicates = arr,
+            ProcessInParallel = _processInParallel,
+            ParallelThreads = _parallelThreads
+        };
+    }
+}

Beam.Downloaders/FragmentOptions.cs

@@ -0,0 +1,7 @@
+namespace Beam.Downloaders;
+
+public record class FragmentOptions {
+    public required int FragmentSize { get; init; }
+    public bool DownloadInParallel { get; init; } = false;
+    public int? ParallelThreads { get; init; }
+}

Beam.Downloaders/FragmentOptionsBuilder.cs

@@ -0,0 +1,36 @@
+namespace Beam.Downloaders;
+
+public sealed class FragmentOptionsBuilder {
+    private int? _fragmentSize;
+    private bool _downloadInParallel = false;
+    private int? _parallelThreads = null;
+
+    public FragmentOptionsBuilder WithFragmentSize(int bytes) {
+        if (bytes <= 0) throw new System.ArgumentOutOfRangeException(nameof(bytes));
+        _fragmentSize = bytes;
+        return this;
+    }
+
+    public FragmentOptionsBuilder WithDownloadInParallel(bool value = true) {
+        _downloadInParallel = value;
+        return this;
+    }
+
+    public FragmentOptionsBuilder WithParallelThreads(int? threads) {
+        if (threads.HasValue && threads.Value <= 0)
+            throw new System.ArgumentOutOfRangeException(nameof(threads));
+        _parallelThreads = threads;
+        return this;
+    }
+
+    public FragmentOptions Build() {
+        if (!_fragmentSize.HasValue)
+            throw new System.InvalidOperationException("FragmentSize must be provided.");
+
+        return new FragmentOptions {
+            FragmentSize = _fragmentSize.Value,
+            DownloadInParallel = _downloadInParallel,
+            ParallelThreads = _parallelThreads
+        };
+    }
+}

Beam.Downloaders/SequentialDownloader.cs

@@ -1,18 +1,19 @@
-using HtmlAgilityPack;
+using Beam.Abstractions;
+using Beam.Models;
 using Microsoft.Extensions.Logging;
 
-namespace Beam {
+namespace Beam.Downloaders {
-    public class SequentialDownloader<RawType, OutType> : IAsyncEnumerator<OutType> {
+    public class SequentialDownloader<OutType> : IAsyncEnumerator<OutType> {
         public OutType Current { get; protected set; }
-        public DownloadContext<RawType> Context { get; }
+        public DownloadContext Context { get; }
         public ILogger? Logger { get; set; }
         public int LastOrder { get; set; } = 0;
 
-        protected IEnumerator<SourceLink> LinksEnumerator;
+        protected IEnumerator<string> LinksEnumerator;
 
         public Func<IUnitDownloader<OutType>> GetUnitDownloader { get; set; }
 
-        public SequentialDownloader(DownloadContext<RawType> context, Func<DownloadContext<RawType>, IUnitDownloader<OutType>> getUnitDownloader, ILogger? logger = null) {
+        public SequentialDownloader(DownloadContext context, Func<DownloadContext, IUnitDownloader<OutType>> getUnitDownloader, ILogger? logger = null) {
             Context = context;
             Logger = logger;
             LinksEnumerator = Context.Links.GetEnumerator();
@@ -41,22 +42,29 @@ namespace Beam {
             List<Ordered<string>> links = [];
 
             //Logger?.LogInformation("MoveNextAsync() \n\t -> Links.Current = {} ", LinksEnumerator.Current.Link.AbsoluteUri);
-            links.Add(new Ordered<string>(LinksEnumerator.Current.Link.AbsoluteUri, LastOrder++));
+            links.Add(new Ordered<string>(LinksEnumerator.Current, LastOrder++));
+
+            while (links.Count < idealLinkCount && LinksEnumerator.MoveNext()) {
+                if (string.IsNullOrWhiteSpace(LinksEnumerator.Current)) {
+                    return false;
+                }
+                
+                links.Add(new Ordered<string>(LinksEnumerator.Current, LastOrder++));
+            }
 
-            while (LinksEnumerator.MoveNext() && LinksEnumerator.Current != SourceLink.InvalidLink && links.Count < idealLinkCount)
-                links.Add(new Ordered<string>(LinksEnumerator.Current.Link.AbsoluteUri, LastOrder++));
             //Logger?.LogInformation("MoveNextAsync() \n\t -> links.Count = {} ", links.Count);
             if (links.Count == 0) {
                 Logger?.LogInformation("Out of links!");
                 return false;
             }
 
-            if (links.Any((x) => x.Data == SourceLink.InvalidLink.Link.AbsoluteUri))
+            if (links.Any((x) => string.IsNullOrWhiteSpace(x.Data)))
                 return false;
 
             var (result, downloadedT) = await unit.TryDownload(
                 links.ToArray(),
                 Context.CancellationToken, 
+                downProgress: Context.DownloadReporter,
                 tryProgress: Context.RetryReporter);
 
             if (!result) {

Beam.Downloaders/SequentialFragmentDownloader.cs

@@ -1,11 +1,12 @@
-using Microsoft.Extensions.Logging;
+using Beam.Abstractions;
-using System.Collections.Concurrent;
+using Beam.Models;
+using Microsoft.Extensions.Logging;
 
-namespace Beam {
+namespace Beam.Downloaders {
-    public class SequentialFragmentDownloader<RawType, OutType> : SequentialDownloader<RawType, Fragment<Ordered<OutType>>> {
+    public class SequentialFragmentDownloader<OutType> : SequentialDownloader<Fragment<Ordered<OutType>>> {
         public SequentialFragmentDownloader(
-            DownloadContext<RawType> context, 
+            DownloadContext context, 
-            Func<DownloadContext<RawType>, IUnitDownloader<Fragment<Ordered<OutType>>>> getUnitDownloader,
+            Func<DownloadContext, IUnitDownloader<Fragment<Ordered<OutType>>>> getUnitDownloader,
             ILogger? logger = null) 
             : base(context, getUnitDownloader, logger) {}
     }

Beam.Downloaders/SkipPredicateOptions.cs

@@ -0,0 +1,48 @@
+using Beam.Models;
+
+namespace Beam.Downloaders;
+
+public class SkipPredicateOptions<OutType> {
+    public required SkipPredicate<OutType>?[]? SkipPredicates { get; init; }
+    public bool ProcessInParallel { get; init; } = false;
+    public int? ParallelThreads { get; init; }
+}
+
+public class SkipPredicateOptionsBuilder<OutType> {
+    private List<SkipPredicate<OutType>?> _skipPredicates { get; set; } = [];
+    private bool _processInParallel { get; set; } = false;
+    private int? _parallelThreads { get; set; }
+
+    public SkipPredicateOptionsBuilder<OutType> WithSkipPredicate(SkipPredicate<OutType> predicate, bool replace=false) {
+        if (replace)
+            _skipPredicates.Clear();
+        _skipPredicates.Add(predicate);
+        return this;
+    }
+
+    public SkipPredicateOptionsBuilder<OutType> WithSkipPredicates(SkipPredicate<OutType>[] predicates,
+        bool replace = true) {
+        if (replace)
+            _skipPredicates.Clear();
+        _skipPredicates.AddRange(predicates);
+        return this;
+    }
+
+    public SkipPredicateOptionsBuilder<OutType> ProcessInParallel(bool processInParallel = true) {
+        _processInParallel = processInParallel;
+        return this;
+    }
+
+    public SkipPredicateOptionsBuilder<OutType> WithParallelThreads(int parallelThreads) {
+        _parallelThreads = parallelThreads;
+        return this;
+    }
+
+    public SkipPredicateOptions<OutType> Build() {
+        return new SkipPredicateOptions<OutType>() {
+            SkipPredicates = _skipPredicates.ToArray(),
+            ParallelThreads = _parallelThreads,
+            ProcessInParallel = _processInParallel
+        };
+    }
+}

Beam.Downloaders/UnitDownloader.cs

@@ -0,0 +1,200 @@
+using System.Diagnostics.CodeAnalysis;
+using System.Text;
+using Beam.Abstractions;
+using Beam.Models;
+using HtmlAgilityPack;
+using File = System.IO.File;
+
+namespace Beam.Downloaders {
+    /// <summary>
+    /// A download managing class that manages a singular download with failure-detection and exponential-backoff retries. This class is safe to instantiate per request.
+    /// </summary>
+    /// <typeparam name="T"></typeparam>
+    /// <param name="web"></param>
+    /// <param name="transformer"></param>
+    /// <param name="failurePredicate"></param>
+    public class UnitDownloader<OutType>(UnitDownloaderOptions<OutType> options) : IUnitDownloader<OutType> {
+        public UnitDownloaderOptions<OutType> Options { get; } = options;
+        public HttpClient Client => Options.Client;
+        public virtual AsyncTransformer<ByteDocument, OutType> Transformer => Options.AsyncTransformer;
+        
+        public virtual AsyncDownloadFailurePredicate<ByteDocument>?[]? FailurePredicates =>
+            Options?.FailurePredicateOptions?.AsyncDownloadFailurePredicates;
+
+        public int LinksPerDownload { get; } = 1;
+
+        protected virtual async Task DownloadToStream(string url, int bufferSize, Stream destinationStream, IProgress<IDownloadReport> progress,
+            CancellationToken ct) {
+            if (options.FollowRedirects) {
+                var response = await Client.GetAsync(url, ct); // automatically follows redirects
+                await response.Content.CopyToAsync(destinationStream, ct);
+                progress?.Report(new DownloadReport() {
+                    BytesDownloaded = destinationStream.Length,
+                    BytesRemaining = 0
+                });
+                return;
+            }
+            
+            var stream = await Client.GetStreamAsync(url, ct); // does not follow redirects
+            byte[] buffer = new byte[bufferSize];
+            int inBuffer = 0;
+            long downloaded = 0;
+
+            long? remaining() {
+                try {
+                    return stream.Length - downloaded;
+                }
+                catch {
+                    return null;
+                }
+            }   
+            
+            while ((inBuffer = stream.Read(buffer)) > 0) {
+                downloaded += inBuffer;
+                await destinationStream.WriteAsync(buffer.AsMemory(0, inBuffer), ct);
+                progress?.Report(new DownloadReport() {
+                    BytesDownloaded = inBuffer,
+                    BytesRemaining = remaining()
+                });
+                
+                ct.ThrowIfCancellationRequested();
+            }
+        }
+
+        protected virtual async Task DownloadToFile(string url, int bufferSize, string path,
+            IProgress<IDownloadReport> progress, CancellationToken ct) {
+
+            if (!Directory.Exists(Path.GetDirectoryName(path)))
+                throw new InvalidOperationException(
+                    string.Format(Exceptions.Exceptions.unit_download_directory_nonexistant, path));
+            await using var file = File.OpenWrite(path);
+            await DownloadToStream(url, bufferSize, file, progress, ct);
+        }
+
+        protected virtual async Task<ByteDocument> DownloadToMemory(string url, int bufferSize,
+            IProgress<IDownloadReport> progress, CancellationToken ct) {
+
+            await using var ms = new MemoryStream();
+            await DownloadToStream(url, bufferSize, ms, progress, ct);
+            if (!ms.TryGetBuffer(out var bytes))
+                throw new Exception(Exceptions.Exceptions.unit_download_invalid_memory_stream);
+            return new ByteDocument(url, bytes);
+        }
+        
+        protected virtual async Task<bool> IsFailure(ByteDocument doc, CancellationToken ct) {
+            if (FailurePredicates is null)
+                return false;
+            if (!(Options?.FailurePredicateOptions?.ProcessInParallel ?? false))
+                foreach (var pred in FailurePredicates) {
+                    if (pred is null)
+                        continue;
+                    if (await pred(doc))
+                        return true;
+                }
+            else {
+                var failed = false;
+                await Parallel.ForEachAsync(FailurePredicates, new ParallelOptions() {
+                        MaxDegreeOfParallelism = Options?.FailurePredicateOptions?.ParallelThreads ?? 4,
+                        CancellationToken = ct
+                    },
+                    async (predicate, token) => {
+                        if (token.IsCancellationRequested)
+                            return;
+                        if (failed)
+                            return;
+                        if (predicate == null)
+                            return;
+                        if (await predicate(doc))
+                            Interlocked.CompareExchange(ref failed, true, false);
+                    }
+                );
+                return failed;
+            }
+
+            return false;
+        }
+
+        protected virtual async Task<ByteDocument> _Download(string link, IProgress<IDownloadReport> progress, CancellationToken ct) {
+            if (Options.DownloadFolder is not null) {
+                var path = Path.Combine(Options.DownloadFolder, options.GetFileNameForDownload(link, []));
+                await DownloadToFile(link, Options.BufferSize, path, progress, ct);
+                return new ByteDocument(link, Encoding.UTF8.GetBytes(path));
+            }
+            else {
+                return await DownloadToMemory(link, Options.BufferSize, progress, ct);
+            }
+        }
+        
+        protected virtual async Task<(bool, OutType?)> Transform(ByteDocument download, CancellationToken ct) {
+            try {
+                if (FailurePredicates is null || !(await IsFailure(download, ct)))
+                    return (true, await Transformer(download));
+                else
+                    return (false, default);
+            } catch(Exception) {
+                return (false, default);
+            }
+        }
+
+        public async Task<(bool, OutType?)> TryDownload(IOrdered<string>[] link, CancellationToken ct, int maximumRetryCount = 7, IProgress<IDownloadReport>? downProgress = null, IProgress<IRetryReport>? tryProgress = null) {
+            if (link.Length == 0)
+                return (false, default);
+
+            downProgress ??= new Progress<IDownloadReport>();
+
+            if (ShouldSkip(link[0].Data, out var defaultType))
+                return (true, defaultType);
+            
+            OutType? ot = default;
+            int tryCount = 0;
+            while (tryCount < maximumRetryCount) {
+                ct.ThrowIfCancellationRequested();
+                var rt = await _Download(link[0].Data, downProgress, ct);
+                (var success, ot) = await Transform(rt, ct);
+                if (success && ot != null)
+                    return (true, ot);
+                ++tryCount;
+                tryProgress?.Report(new RetryReport(tryCount, link[0].Data));
+                await Task.Delay((int)Math.Pow(2, tryCount) * 1000);
+            }
+
+            return (false, ot);
+        }
+
+        private bool ShouldSkip(string link, [NotNullWhen(true)] out OutType? outType) {
+            outType = default;
+            if (Options.SkipPredicateOptions?.SkipPredicates is null)
+                return false;
+            if (!Options.SkipPredicateOptions.ProcessInParallel)
+                foreach (var pred in Options.SkipPredicateOptions.SkipPredicates) {
+                    if (pred is null)
+                        continue;
+                    if (pred(link, out outType))
+                        return true;
+                }
+            else {
+                var shouldSkip = false;
+                OutType? _outType = default;
+                Parallel.ForEach(Options.SkipPredicateOptions.SkipPredicates, new ParallelOptions() {
+                        MaxDegreeOfParallelism = Options?.FailurePredicateOptions?.ParallelThreads ?? 4
+                    },
+                    (predicate, parallelLoopState) => {
+                        if (parallelLoopState.ShouldExitCurrentIteration)
+                            return;
+                        if (predicate == null)
+                            return;
+                        if (predicate(link, out var _innerLoopOutType)) {
+                            Interlocked.CompareExchange(ref shouldSkip, true, false);
+                            Interlocked.CompareExchange(ref _outType, _innerLoopOutType, default);
+                            parallelLoopState.Break();
+                        }
+                    }
+                );
+                outType = _outType;
+                return shouldSkip;
+            }
+
+            return false;
+        }
+    }
+}

Beam.Downloaders/UnitDownloaderOptions.cs

@@ -0,0 +1,40 @@
+using System.Diagnostics.CodeAnalysis;
+using System.Security.Cryptography;
+using System.Text;
+using Beam.Models;
+
+namespace Beam.Downloaders;
+
+public record class UnitDownloaderOptions<OutType> {
+    public HttpClient Client { get; init; } = new();
+
+    public DownloadTarget Target { get; init; } = DownloadTarget.URL;
+    
+    public SkipPredicateOptions<OutType>? SkipPredicateOptions { get; init; }
+    public FailurePredicateOptions<ByteDocument>? FailurePredicateOptions { get; init; }
+    public FragmentOptions? FragmentOptions { get; init; }
+    public required AsyncTransformer<ByteDocument, OutType> AsyncTransformer { get; init; }
+    
+    /// <summary>
+    /// The location where the download is stored.
+    /// </summary>
+    /// <remarks>
+    /// If not defined, <c>UnitDownloader.TryDownload()</c> downloads to memory. 
+    /// </remarks>
+    public string? DownloadFolder { get; init; } = null;
+    public int BufferSize { get; init; } = 80 * 1024; // 80kb
+
+    public bool FollowRedirects { get; init; } = true;
+
+    public string GetFileNameForDownload(string url, byte[] additionalData) {
+        byte[] bytes = [..Encoding.UTF8.GetBytes(url), ..additionalData];
+        var name = Convert.ToBase64String(System.IO.Hashing.XxHash64.Hash(bytes));
+        return name.Replace('+', '-').Replace('/', '_').Replace('=', ' ').Trim();
+    }
+}
+
+// ---------- UnitDownloaderOptions Builder ----------
+
+// ---------- FailurePredicateOptions Builder ----------
+
+// ---------- FragmentOptions Builder ----------

Beam.Downloaders/UnitDownloaderOptionsBuilder.cs

@@ -0,0 +1,114 @@
+using Beam.Models;
+
+namespace Beam.Downloaders;
+
+public sealed class UnitDownloaderOptionsBuilder<OutType> {
+    private DownloadTarget _target = DownloadTarget.URL;
+    private HttpClient _client = new HttpClient();
+    private FailurePredicateOptionsBuilder<ByteDocument> _failureOptionsBuilder = new();
+    private FailurePredicateOptions<ByteDocument>? _failurePredicateOptionsOverride = null;
+    private SkipPredicateOptionsBuilder<OutType> _skipPredicateOptionsBuilder = new();
+    private SkipPredicateOptions<OutType>? _skipPredicateOptionsOverride = null;
+    private FragmentOptions? _fragmentOptions;
+    private AsyncTransformer<ByteDocument, OutType>? _asyncTransformer;
+    private string? _downloadFolder = null;
+    private int _bufferSize = 80 * 1024;
+    private bool _followRedirects = true;
+
+    public UnitDownloaderOptionsBuilder<OutType> WithTarget(DownloadTarget target) {
+        _target = target;
+        return this;
+    }
+
+    public UnitDownloaderOptionsBuilder<OutType> WithFollowRedirects(bool followRedirects) {
+        _followRedirects = followRedirects;
+        return this;
+    }
+        
+    public UnitDownloaderOptionsBuilder<OutType> WithClient(HttpClient client)
+    {
+        _client = client ?? throw new System.ArgumentNullException(nameof(client));
+        return this;
+    }
+
+    public UnitDownloaderOptionsBuilder<OutType> WithFailurePredicateOptions(FailurePredicateOptions<ByteDocument>? options)
+    {
+        _failurePredicateOptionsOverride = options;
+        return this;
+    }
+
+    public UnitDownloaderOptionsBuilder<OutType> WithFailurePredicates(System.Action<FailurePredicateOptionsBuilder<ByteDocument>> configure)
+    {
+        if (configure == null) throw new System.ArgumentNullException(nameof(configure));
+        configure(_failureOptionsBuilder);
+        return this;
+    }
+
+    public UnitDownloaderOptionsBuilder<OutType> WithFragmentOptions(FragmentOptions? options)
+    {
+        _fragmentOptions = options;
+        return this;
+    }
+
+    public UnitDownloaderOptionsBuilder<OutType> WithSkipPredicates(Action<SkipPredicateOptionsBuilder<OutType>> configure) {
+        if (configure == null) throw new ArgumentNullException(nameof(configure));
+        configure(_skipPredicateOptionsBuilder);
+        return this;
+    }
+
+    public UnitDownloaderOptionsBuilder<OutType> WithSkipPredicateOptions(
+        SkipPredicateOptions<OutType> skipPredicateOptions) {
+        _skipPredicateOptionsOverride = skipPredicateOptions;
+        return this;
+    }
+
+    public UnitDownloaderOptionsBuilder<OutType> WithFragments(System.Action<FragmentOptionsBuilder> configure)
+    {
+        if (configure == null) throw new System.ArgumentNullException(nameof(configure));
+        var b = new FragmentOptionsBuilder();
+        configure(b);
+        _fragmentOptions = b.Build();
+        return this;
+    }
+
+    public UnitDownloaderOptionsBuilder<OutType> WithAsyncTransformer(AsyncTransformer<ByteDocument, OutType> transformer)
+    {
+        _asyncTransformer = transformer ?? throw new System.ArgumentNullException(nameof(transformer));
+        return this;
+    }
+
+    public UnitDownloaderOptionsBuilder<OutType> WithDownloadFolder(string? downloadFolder)
+    {
+        _downloadFolder = downloadFolder;
+        return this;
+    }
+
+    public UnitDownloaderOptionsBuilder<OutType> WithBufferSize(int bytes)
+    {
+        if (bytes <= 0) throw new System.ArgumentOutOfRangeException(nameof(bytes));
+        _bufferSize = bytes;
+        return this;
+    }
+
+    public UnitDownloaderOptions<OutType> Build()
+    {
+        if (_asyncTransformer == null)
+            throw new System.InvalidOperationException("AsyncTransformer must be provided.");
+
+        _failurePredicateOptionsOverride ??= _failureOptionsBuilder.Build();
+        _skipPredicateOptionsOverride ??= _skipPredicateOptionsBuilder.Build();
+        
+        return new UnitDownloaderOptions<OutType>
+        {
+            Target = _target,
+            Client = _client,
+            FailurePredicateOptions = _failurePredicateOptionsOverride,
+            SkipPredicateOptions = _skipPredicateOptionsOverride,
+            FollowRedirects = _followRedirects,
+            FragmentOptions = _fragmentOptions,
+            AsyncTransformer = _asyncTransformer,
+            DownloadFolder = _downloadFolder,
+            BufferSize = _bufferSize
+        };
+    }
+}

Beam.Downloaders/UnitFragmentDownloader.cs

@@ -0,0 +1,46 @@
+using Beam.Abstractions;
+using Beam.Exceptions;
+using Beam.Models;
+using HtmlAgilityPack;
+using Microsoft.Extensions.Logging;
+
+namespace Beam.Downloaders {
+    public class UnitFragmentDownloader<OutType>(UnitDownloaderOptions<OutType> options,
+        IUnitDownloader<OutType>? internalDownloader = null) : IUnitDownloader<Fragment<Ordered<OutType>>> {
+
+        public UnitDownloaderOptions<OutType> Options { get; } = options;
+        public int LinksPerDownload { get; set; }
+        private IUnitDownloader<OutType> UnitDownloader { get;  } = internalDownloader ?? new UnitDownloader<OutType>(options);
+
+        async Task<(bool, Fragment<Ordered<OutType>>?)> IUnitDownloader<Fragment<Ordered<OutType>>>.TryDownload(IOrdered<string>[] link, CancellationToken ct, int maximumRetryCount, IProgress<IDownloadReport>? downProgress, IProgress<IRetryReport>? tryProgress) {
+            Fragment<Ordered<OutType>> fragment = new Fragment<Ordered<OutType>>(link.Length);
+            if (!Fragment<Ordered<OutType>>.TryAcquireUpdater(fragment, out var updater))
+                throw new AssertionException(Exceptions.Exceptions.fragment_locked);
+            bool isFailure = false;
+            await Parallel.ForEachAsync(link, async (x, pct) => {
+                pct.ThrowIfCancellationRequested();
+                ct.ThrowIfCancellationRequested();
+                if (isFailure)
+                    return;
+                var (result, downloadedT) = await UnitDownloader.TryDownload([x], ct, maximumRetryCount, downProgress, tryProgress);
+                if (!result) {
+                    Interlocked.Exchange(ref isFailure, true);
+                    return;
+                }
+                if (downloadedT == null) {
+                    Interlocked.Exchange(ref isFailure, true);
+                    return;
+                }
+                updater(new Ordered<OutType>(downloadedT, x.Order));
+            });
+
+            if (!isFailure)
+                Fragment<Ordered<OutType>>.SetComplete(fragment, true);
+
+            Fragment<Ordered<OutType>>.TryReleaseUpdater(fragment, updater);
+            
+            return (!isFailure, fragment);
+
+        }
+    }
+}

Beam.Dynamic/AnchorCollectionDataProvider.cs

@@ -1,53 +0,0 @@
-using HtmlAgilityPack;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace Beam.Dynamic {
-    public class AnchorCollectionDataProvider : IDataProvider<string[]>, IDataProvider<SourceLink[]> {
-        public IBinding? Content { get; set; }
-        public string? RelativeTo { get; set; }
-
-        private string GetAbsolute(string? @base, string relative) {
-            if (@base is null)
-                return relative;
-
-            if (@base.EndsWith('/'))
-                @base = @base[..^1];
-            if (relative.StartsWith('/'))
-                relative = relative[1..];
-            return @base + '/' + relative;
-        }
-
-        public string[] Get(HtmlDocument document) {
-            if (Content is null)
-                return [];
-
-            var node = Content.Select(document);
-            if (node is null)
-                return [];
-
-            List<string> links = [];
-            foreach (var child in node.Descendants())
-                links.Add(child.GetAttributeValue("href", ""));
-
-            return links.Where(x => !string.IsNullOrWhiteSpace(x)).ToArray();
-        }
-
-        SourceLink[] IDataProvider<SourceLink[]>.Get(HtmlDocument document) {
-            var links = Get(document);
-
-            if (links.Length == 0)
-                return [];
-
-            List<SourceLink> slinks = [];
-            foreach (var link in links)
-                if (Uri.TryCreate(GetAbsolute(RelativeTo, link), UriKind.RelativeOrAbsolute, out _))
-                    slinks.Add(new SourceLink(GetAbsolute(RelativeTo, link)));
-
-            return slinks.ToArray();
-        }
-    }
-}

Beam.Dynamic/AnchorDataProvider.cs

@@ -1,31 +0,0 @@
-using HtmlAgilityPack;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace Beam.Dynamic {
-    public class AnchorDataProvider : IDataProvider<SourceLink>, IDataProvider<string> {
-        public IBinding? Content { get; set; }
-
-        public string Get(HtmlDocument document) {
-            if (Content is null)
-                return "";
-
-            return Content.Select(document)?.GetAttributeValue("href", "") ?? "";
-
-        }
-
-        SourceLink IDataProvider<SourceLink>.Get(HtmlDocument document) {
-            var content = Get(document);
-            if (content is null)
-                return SourceLink.InvalidLink;
-
-            if (!Uri.TryCreate(content, UriKind.RelativeOrAbsolute, out _))
-                return SourceLink.InvalidLink;
-
-            return new SourceLink(content);
-        }
-    }
-}

Beam.Dynamic/Architecture.cs

@@ -1,13 +1,7 @@
 using aeqw89.DataKeys;
-using HtmlAgilityPack;
+using Beam.Abstractions;
-using Microsoft.Extensions.Logging;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace Beam.Temporary.Cli {
+namespace Beam.Dynamic {
     /// <summary>
     /// <para>
     ///     A collection of specific useful methods and constants that facilitate the use of the application; allows other parts of the application to depend on architecture-specific arbitrary choices without compromising the Single-Responsibility principle or increasing redundant code. 

Beam.Dynamic/Beam.Dynamic.csproj

@@ -6,14 +6,14 @@
         <Nullable>enable</Nullable>
     </PropertyGroup>
     <ItemGroup>
-        <PackageReference Include="aeqw89.DataKeys" Version="2.0.1" />
+        <PackageReference Include="aeqw89.DataKeys" Version="2.1.1" />
-        <PackageReference Include="aeqw89.PersistentData" Version="1.1.0" />
+        <PackageReference Include="aeqw89.PersistentData" Version="1.4.5" />
         <PackageReference Include="HtmlAgilityPack" Version="1.11.72" />
         <PackageReference Include="Microsoft.Recognizers.Text.Number" Version="1.8.13" />
     </ItemGroup>
     <ItemGroup>
-        <ProjectReference Include="..\Beam\Beam.csproj">
+      <ProjectReference Include="..\Beam.Abstractions\Beam.Abstractions.csproj" />
-            <PrivateAssets>all</PrivateAssets>
+      <ProjectReference Include="..\Beam.Exceptions\Beam.Exceptions.csproj" />
-        </ProjectReference>
+      <ProjectReference Include="..\Beam.Models\Beam.Models.csproj" />
     </ItemGroup>
 </Project>

Beam.Dynamic/Beam.Dynamic.csproj.DotSettings

@@ -0,0 +1,2 @@
+<wpf:ResourceDictionary xml:space="preserve" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:s="clr-namespace:System;assembly=mscorlib" xmlns:ss="urn:shemas-jetbrains-com:settings-storage-xaml" xmlns:wpf="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
+	<s:Boolean x:Key="/Default/CodeInspection/NamespaceProvider/NamespaceFoldersToSkip/=dataproviders/@EntryIndexedValue">True</s:Boolean></wpf:ResourceDictionary>

Beam.Dynamic/BindingsCollection.cs

@@ -0,0 +1,12 @@
+using System.Collections;
+using System.Diagnostics.CodeAnalysis;
+using aeqw89.DataKeys;
+using aeqw89.PersistentData;
+using Beam.Abstractions;
+
+namespace Beam.Dynamic;
+
+public class BindingsCollection(Table<IDataProvider>? providers = null)  {
+    public Table<IDataProvider> Providers { get; } = providers ?? [];
+    
+}

Beam.Dynamic/CommonStateChangers.cs

@@ -3,33 +3,35 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
+using Beam.Abstractions;
 
-namespace Beam {
+namespace Beam.Dynamic {
     public static class CommonStateChangers {
         public static IStateChangeBehaviour LastAsNumber => new NumberedStateChanger((x, i) => {
-            object last = x[^1];
+            object last = x.GetState()[^1];
             if (!int.TryParse(last.ToString(), out var number))
-                throw new InvalidOperationException(S.M.StateChangeError);
+                throw new InvalidOperationException(Exceptions.Exceptions.state_change_error); // TODO use more specific exception
-            x[^1] = (number + i).ToString();
+            x.GetState()[^1] = (number + i).ToString();
         });
 
         public static IStateChangeBehaviour Constant => new ConstantStateChanger();
 
         public static IStateChangeBehaviour NthAsNumber(Index n, bool keepSuffix = true)
             => new NumberedStateChanger((x, i) => {
-                string? nth = x[n]?.ToString();
+                string? nth = x.GetState()[n]?.ToString();
+                string[] xState = x.GetState();
                 if (nth is null)
-                    throw new InvalidOperationException(S.M.StateChangeError);
+                    throw new InvalidOperationException(Exceptions.Exceptions.state_change_error); // TODO use more specific exception
                 if (!int.TryParse(nth, out var number))
                     if (keepSuffix) {
                         string[] split = nth.Split('.');
                         if (!int.TryParse(split[0], out number))
-                            throw new InvalidOperationException(S.M.StateChangeError);
+                            throw new InvalidOperationException(Exceptions.Exceptions.state_change_error); // TODO use more specific exception
-                        x[n] = (number + i) + split[1..].Aggregate((x, y) => $"{x}.{y}");
+                        xState[n] = (number + i) + split[1..].Aggregate((x, y) => $"{x}.{y}");
                         return;
                     } else
-                        throw new InvalidOperationException(S.M.StateChangeError);
+                        throw new InvalidOperationException(Exceptions.Exceptions.state_change_error); // TODO use more specific exception
-                x[n] = (number + i).ToString();
+                xState[n] = (number + i).ToString();
             });
 
 

Beam.Dynamic/CommonTransformers.cs

@@ -0,0 +1,45 @@
+using aeqw89.DataKeys;
+using Beam.Abstractions;
+using Beam.Models;
+using HtmlAgilityPack;
+
+namespace Beam.Dynamic;
+
+public static class CommonTransformers {
+    public static AsyncTransformer<HtmlDocument, ArticleData> ArticleDataTransformer(DataBindings? binding) =>
+        (x) => {
+            return Task.FromResult(new ArticleData() {
+                Authors = binding?.Authors?.Get(x)?.Select(StringCleaner.Clean)?.ToArray() ?? [],
+                Name = StringCleaner.Clean(binding?.Title?.Get(x) ?? ""),
+                Categories = binding?.Tags?.Get(x)?.Select(StringCleaner.Clean)?.ToArray() ?? [],
+                Description = StringCleaner.Clean(binding?.Description?.Get(x) ?? "")
+            });
+        };
+
+    public static AsyncTransformer<HtmlDocument, TableOfContentsData>
+        TableOfContentsTransformer(DataBindings? binding) => (x) => {
+        return Task.FromResult(new TableOfContentsData() {
+            Authors = binding?.Authors?.Get(x)?.Select(StringCleaner.Clean)?.ToArray() ?? [],
+            Name = StringCleaner.Clean(binding?.Title?.Get(x) ?? ""),
+            Categories = binding?.Tags?.Get(x)?.Select(StringCleaner.Clean)?.ToArray() ?? [],
+            Description = StringCleaner.Clean(binding?.Description?.Get(x) ?? ""),
+            ContentLinks = binding?.TableOfContents?.Get(x) ?? [],
+            PagesLinks = binding?.PagesDropDown?.Get(x) ?? []
+        });
+    };
+
+    public static AsyncTransformer<HtmlDocument, StringDocument> DocumentTransformer(DataBindings? binding,
+        IDocumentMetaData? metaData = null) => (x) => {
+        var resolved = binding?.Resolve(x);
+        var articleData = new ArticleData() {
+            Name = StringCleaner.Clean(resolved?.Title),
+        };
+        Dictionary<DataKey<IDocumentMetaData>, IDocumentMetaData> meta = [];
+        meta.Add(IArchitecture.Default.ChapterKey, articleData);
+        if (metaData is not null)
+            meta.Add(IArchitecture.Default.BookKey, metaData);
+        return Task.FromResult(new StringDocument(Path.GetRandomFileName(), StringCleaner.Clean(resolved?.Content)) {
+            MetaData = meta
+        });
+    };
+}

Beam.Dynamic/ConstantStateChanger.cs

@@ -0,0 +1,9 @@
+using Beam.Abstractions;
+
+namespace Beam.Dynamic {
+    public class ConstantStateChanger : IStateChangeBehaviour {
+        public void Apply(IState state, object stimulus) {
+            return;
+        }
+    }
+}

Beam.Dynamic/ContentsArrayDataProvider.cs

@@ -1,15 +0,0 @@
-using HtmlAgilityPack;
-
-namespace Beam.Dynamic {
-    public class ContentsArrayDataProvider : ContentsDataProvider, IDataProvider<string[]> {
-        public string[] ArrayDelimiters { get; set; } = [";"];
-
-        string[] IDataProvider<string[]>.Get(HtmlDocument document) {
-            if (Content is null)
-                return [];
-
-            return Content.Select(document)?.InnerText?.Split(ArrayDelimiters, StringSplitOptions.RemoveEmptyEntries) ?? [];
-        }
-    }
-
-}

Beam.Dynamic/ContentsDataProvider.cs

@@ -1,20 +0,0 @@
-using HtmlAgilityPack;
-using System;
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace Beam.Dynamic {
-    public class ContentsDataProvider : IDataProvider<string> {
-        public IBinding? Content { get; set; }
-
-        public string Get(HtmlDocument document) {
-            if (Content is null)
-                return "";
-
-            return Content.Select(document)?.InnerText ?? "";
-        }
-    }
-}

Beam.Dynamic/DataBindings.cs

@@ -1,191 +1,192 @@
-using HtmlAgilityPack;
+using System.Text.Json.Serialization;
-using System.Text.Json.Serialization;
+using Beam.Abstractions;
+using HtmlAgilityPack;
 
-namespace Beam.Dynamic {
+namespace Beam.Dynamic;
-    public record class DataBindings {
-        #region ---------------------- Common Bindings ----------------------
-        [JsonIgnore]
-        public IDataProvider<string>? Title {
-            get => Get<string>(nameof(Title));
-            set => Providers[nameof(Title)] = value;
-        }
-        [JsonIgnore]
-        public IDataProvider<string[]>? Authors {
-            get => Get<string[]>(nameof(Authors));
-            set => Providers[nameof(Authors)] = value;
-        }
-        [JsonIgnore]
-        public IDataProvider<string>? Description {
-            get => Get<string>(nameof(Description));
-            set => Providers[nameof(Description)] = value;
-        }
-        [JsonIgnore]
-        public IDataProvider<string>? Content {
-            get => Get<string>(nameof(Content));
-            set => Providers[nameof(Content)] = value;
-        }
-        [JsonIgnore]
-        public IDataProvider<string[]>? Language {
-            get => Get<string[]>(nameof(Language));
-            set => Providers[nameof(Language)] = value;
-        }
-        [JsonIgnore]
-        public IDataProvider<string[]>? Tags {
-            get => Get<string[]>(nameof(Tags));
-            set => Providers[nameof(Tags)] = value;
-        }
-        [JsonIgnore]
-        public IDataProvider<string>? Publisher {
-            get => Get<string>(nameof(Publisher));
-            set => Providers[nameof(Publisher)] = value;
-        }
-        [JsonIgnore]
-        public IDataProvider<DateTimeOffset>? PublicationDate {
-            get => Get<DateTimeOffset>(nameof(PublicationDate));
-            set => Providers[nameof(PublicationDate)] = value;
-        }
-        [JsonIgnore]
-        public IDataProvider<string>? ISBN {
-            get => Get<string>(nameof(ISBN));
-            set => Providers[nameof(ISBN)] = value;
-        }
-        [JsonIgnore]
-        public IDataProvider<int>? PageCount {
-            get => Get<int>(nameof(PageCount));
-            set => Providers[nameof(PageCount)] = value;
-        }
-        [JsonIgnore]
-        public IDataProvider<SourceLink>? CoverImage {
-            get => Get<SourceLink>(nameof(CoverImage));
-            set => Providers[nameof(CoverImage)] = value;
-        }
-        [JsonIgnore]
-        public IDataProvider<string[]>? Series {
-            get => Get<string[]>(nameof(Series));
-            set => Providers[nameof(Series)] = value;
-        }
-        [JsonIgnore]
-        public IDataProvider<int>? Edition {
-            get => Get<int>(nameof(Edition));
-            set => Providers[nameof(Edition)] = value;
-        }
-        [JsonIgnore]
-        public IDataProvider<string[]>? Contributors {
-            get => Get<string[]>(nameof(Contributors));
-            set => Providers[nameof(Contributors)] = value;
-        }
-        [JsonIgnore]
-        public IDataProvider<string[]>? Subjects {
-            get => Get<string[]>(nameof(Subjects));
-            set => Providers[nameof(Subjects)] = value;
-        }
-        [JsonIgnore]
-        public IDataProvider<string>? Rights {
-            get => Get<string>(nameof(Rights));
-            set => Providers[nameof(Rights)] = value;
-        }
-        [JsonIgnore]
-        public IDataProvider<SourceLink[]>? TableOfContents {
-            get => Get<SourceLink[]>(nameof(TableOfContents));
-            set => Providers[nameof(TableOfContents)] = value;
-        }
-        [JsonIgnore]
-        public IDataProvider<SourceLink[]>? PagesDropDown {
-            get => Get<SourceLink[]>(nameof(PagesDropDown));
-            set => Providers[nameof(PagesDropDown)] = value;
-        }
-        [JsonIgnore]
-        public IDataProvider<SourceLink>? NextPageButton {
-            get => Get<SourceLink>(nameof(NextPageButton));
-            set => Providers[nameof(NextPageButton)] = value;
-        }
-        [JsonIgnore]
-        public IDataProvider<SourceLink>? PreviousPageButton {
-            get => Get<SourceLink>(nameof(PreviousPageButton));
-            set => Providers[nameof(PreviousPageButton)] = value;
-        }
-        #endregion
 
-        public Dictionary<string, IDataProvider?> Providers { get; set; } = [];
+public record class DataBindings : IDataBindings {
+    #region ---------------------- Common Bindings ----------------------
+    [JsonIgnore]
+    public IDataProvider<string>? Title {
+        get => Get<string>(nameof(Title));
+        set => Providers[nameof(Title)] = value;
+    }
+    [JsonIgnore]
+    public IDataProvider<string[]>? Authors {
+        get => Get<string[]>(nameof(Authors));
+        set => Providers[nameof(Authors)] = value;
+    }
+    [JsonIgnore]
+    public IDataProvider<string>? Description {
+        get => Get<string>(nameof(Description));
+        set => Providers[nameof(Description)] = value;
+    }
+    [JsonIgnore]
+    public IDataProvider<string>? Content {
+        get => Get<string>(nameof(Content));
+        set => Providers[nameof(Content)] = value;
+    }
+    [JsonIgnore]
+    public IDataProvider<string[]>? Language {
+        get => Get<string[]>(nameof(Language));
+        set => Providers[nameof(Language)] = value;
+    }
+    [JsonIgnore]
+    public IDataProvider<string[]>? Tags {
+        get => Get<string[]>(nameof(Tags));
+        set => Providers[nameof(Tags)] = value;
+    }
+    [JsonIgnore]
+    public IDataProvider<string>? Publisher {
+        get => Get<string>(nameof(Publisher));
+        set => Providers[nameof(Publisher)] = value;
+    }
+    [JsonIgnore]
+    public IDataProvider<DateTimeOffset>? PublicationDate {
+        get => Get<DateTimeOffset>(nameof(PublicationDate));
+        set => Providers[nameof(PublicationDate)] = value;
+    }
+    [JsonIgnore]
+    public IDataProvider<string>? ISBN {
+        get => Get<string>(nameof(ISBN));
+        set => Providers[nameof(ISBN)] = value;
+    }
+    [JsonIgnore]
+    public IDataProvider<int>? PageCount {
+        get => Get<int>(nameof(PageCount));
+        set => Providers[nameof(PageCount)] = value;
+    }
+    [JsonIgnore]
+    public IDataProvider<string>? CoverImage {
+        get => Get<string>(nameof(CoverImage));
+        set => Providers[nameof(CoverImage)] = value;
+    }
+    [JsonIgnore]
+    public IDataProvider<string[]>? Series {
+        get => Get<string[]>(nameof(Series));
+        set => Providers[nameof(Series)] = value;
+    }
+    [JsonIgnore]
+    public IDataProvider<int>? Edition {
+        get => Get<int>(nameof(Edition));
+        set => Providers[nameof(Edition)] = value;
+    }
+    [JsonIgnore]
+    public IDataProvider<string[]>? Contributors {
+        get => Get<string[]>(nameof(Contributors));
+        set => Providers[nameof(Contributors)] = value;
+    }
+    [JsonIgnore]
+    public IDataProvider<string[]>? Subjects {
+        get => Get<string[]>(nameof(Subjects));
+        set => Providers[nameof(Subjects)] = value;
+    }
+    [JsonIgnore]
+    public IDataProvider<string>? Rights {
+        get => Get<string>(nameof(Rights));
+        set => Providers[nameof(Rights)] = value;
+    }
+    [JsonIgnore]
+    public IDataProvider<string[]>? TableOfContents {
+        get => Get<string[]>(nameof(TableOfContents));
+        set => Providers[nameof(TableOfContents)] = value;
+    }
+    [JsonIgnore]
+    public IDataProvider<string[]>? PagesDropDown {
+        get => Get<string[]>(nameof(PagesDropDown));
+        set => Providers[nameof(PagesDropDown)] = value;
+    }
+    [JsonIgnore]
+    public IDataProvider<string>? NextPageButton {
+        get => Get<string>(nameof(NextPageButton));
+        set => Providers[nameof(NextPageButton)] = value;
+    }
+    [JsonIgnore]
+    public IDataProvider<string>? PreviousPageButton {
+        get => Get<string>(nameof(PreviousPageButton));
+        set => Providers[nameof(PreviousPageButton)] = value;
+    }
+    #endregion
 
-        private IDataProvider<T>? Get<T>(string key) {
+    public Dictionary<string, IDataProvider?> Providers { get; set; } = [];
-            if (Providers.TryGetValue(key, out var k) && k is IDataProvider<T> ks)
-                return ks;
-            return default;
-        }
 
-        public virtual ResolvedBindings Resolve(HtmlDocument doc) {
+    private IDataProvider<T>? Get<T>(string key) {
-            // explicit fields already handled below
+        if (Providers.TryGetValue(key, out var k) && k is IDataProvider<T> ks)
-            var mappedKeys = new HashSet<string> {
+            return ks;
-                nameof(Title), nameof(Authors), nameof(Description), nameof(Content),
+        return default;
-                nameof(Language), nameof(Tags), nameof(Publisher), nameof(PublicationDate),
-                nameof(ISBN), nameof(PageCount), nameof(CoverImage), nameof(Series),
-                nameof(Edition), nameof(Contributors), nameof(Subjects), nameof(Rights),
-                nameof(TableOfContents), nameof(PagesDropDown), nameof(NextPageButton),
-                nameof(PreviousPageButton)
-            };
-
-            var additional = new Dictionary<string, object?>();
-
-            foreach (var (key, provider) in Providers) {
-                if (!mappedKeys.Contains(key) && provider is not null) {
-                    // dynamic call so any IDataProvider<T> works
-                    additional[key] = ((dynamic)provider).Get(doc);
-                }
-            }
-
-            return new ResolvedBindings {
-                Title = Title?.Get(doc),
-                Authors = Authors?.Get(doc) ?? [],
-                Description = Description?.Get(doc),
-                Content = Content?.Get(doc),
-                Language = Language?.Get(doc),
-                Tags = Tags?.Get(doc) ?? [],
-                Publisher = Publisher?.Get(doc),
-                PublicationDate = PublicationDate?.Get(doc),
-                ISBN = ISBN?.Get(doc),
-                PageCount = PageCount?.Get(doc),
-                CoverImage = CoverImage?.Get(doc),
-                Series = Series?.Get(doc) ?? [],
-                Edition = Edition?.Get(doc),
-                Contributors = Contributors?.Get(doc) ?? [],
-                Subjects = Subjects?.Get(doc) ?? [],
-                Rights = Rights?.Get(doc),
-                TableOfContents = TableOfContents?.Get(doc) ?? [],
-                PagesDropDown = PagesDropDown?.Get(doc),
-                NextPageButton = NextPageButton?.Get(doc),
-                PreviousPageButton = PreviousPageButton?.Get(doc),
-                Additional = additional
-            };
-        }
     }
 
-    public record class ResolvedBindings {
+    public virtual ResolvedBindings Resolve(HtmlDocument doc) {
-        public string? Title { get; set; }
+        // explicit fields already handled below
-        public string[]? Authors { get; set; }
+        var mappedKeys = new HashSet<string> {
-        public string? Description { get; set; }
+            nameof(Title), nameof(Authors), nameof(Description), nameof(Content),
-        public string? Content { get; set; }
+            nameof(Language), nameof(Tags), nameof(Publisher), nameof(PublicationDate),
-        public string[]? Language { get; set; }
+            nameof(ISBN), nameof(PageCount), nameof(CoverImage), nameof(Series),
-        public string[]? Tags { get; set; }
+            nameof(Edition), nameof(Contributors), nameof(Subjects), nameof(Rights),
-        public string? Publisher { get; set; }
+            nameof(TableOfContents), nameof(PagesDropDown), nameof(NextPageButton),
-        public DateTimeOffset? PublicationDate { get; set; }
+            nameof(PreviousPageButton)
-        public string? ISBN { get; set; }
+        };
-        public int? PageCount { get; set; }
-        public SourceLink? CoverImage { get; set; }
-        public string[]? Series { get; set; }
-        public int? Edition { get; set; }
-        public string[]? Contributors { get; set; }
-        public string[]? Subjects { get; set; }
-        public string? Rights { get; set; }
-        public SourceLink[]? TableOfContents { get; set; }
-        public SourceLink[]? PagesDropDown { get; set; }
-        public SourceLink? NextPageButton { get; set; }
-        public SourceLink? PreviousPageButton { get; set; }
 
-        /// <summary>
+        var additional = new Dictionary<string, object?>();
-        /// Values resolved from any providers whose keys aren’t represented
+
-        /// by the named properties above.
+        foreach (var (key, provider) in Providers) {
-        /// </summary>
+            if (!mappedKeys.Contains(key) && provider is not null) {
-        public Dictionary<string, object?> Additional { get; set; } = [];
+                // dynamic call so any IDataProvider<T> works
+                additional[key] = ((dynamic)provider).Get(doc);
+            }
+        }
+
+        return new ResolvedBindings {
+            Title = Title?.Get(doc),
+            Authors = Authors?.Get(doc) ?? [],
+            Description = Description?.Get(doc),
+            Content = Content?.Get(doc),
+            Language = Language?.Get(doc),
+            Tags = Tags?.Get(doc) ?? [],
+            Publisher = Publisher?.Get(doc),
+            PublicationDate = PublicationDate?.Get(doc),
+            ISBN = ISBN?.Get(doc),
+            PageCount = PageCount?.Get(doc),
+            CoverImage = CoverImage?.Get(doc),
+            Series = Series?.Get(doc) ?? [],
+            Edition = Edition?.Get(doc),
+            Contributors = Contributors?.Get(doc) ?? [],
+            Subjects = Subjects?.Get(doc) ?? [],
+            Rights = Rights?.Get(doc),
+            TableOfContents = TableOfContents?.Get(doc) ?? [],
+            PagesDropDown = PagesDropDown?.Get(doc),
+            NextPageButton = NextPageButton?.Get(doc),
+            PreviousPageButton = PreviousPageButton?.Get(doc),
+            Additional = additional
+        };
     }
 }
+
+public record class ResolvedBindings {
+    public string? Title { get; set; }
+    public string[]? Authors { get; set; }
+    public string? Description { get; set; }
+    public string? Content { get; set; }
+    public string[]? Language { get; set; }
+    public string[]? Tags { get; set; }
+    public string? Publisher { get; set; }
+    public DateTimeOffset? PublicationDate { get; set; }
+    public string? ISBN { get; set; }
+    public int? PageCount { get; set; }
+    public string? CoverImage { get; set; }
+    public string[]? Series { get; set; }
+    public int? Edition { get; set; }
+    public string[]? Contributors { get; set; }
+    public string[]? Subjects { get; set; }
+    public string? Rights { get; set; }
+    public string[]? TableOfContents { get; set; }
+    public string[]? PagesDropDown { get; set; }
+    public string? NextPageButton { get; set; }
+    public string? PreviousPageButton { get; set; }
+
+    /// <summary>
+    /// Values resolved from any providers whose keys aren’t represented
+    /// by the named properties above.
+    /// </summary>
+    public Dictionary<string, object?> Additional { get; set; } = [];
+}

Beam.Dynamic/DataProviderJsonTypeInfoResolver.cs

@@ -0,0 +1,38 @@
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using System.Text.Json.Serialization.Metadata;
+using Beam.Abstractions;
+
+namespace Beam.Dynamic;
+
+// [JsonDerivedType(typeof(ParagraphedContentDataProvider), "paragraphed")]
+// [JsonDerivedType(typeof(ListContentDataProvider), "list")]
+// [JsonDerivedType(typeof(ContentsArrayDataProvider), "array")]
+// [JsonDerivedType(typeof(ContentsDataProvider), "single")]
+// [JsonDerivedType(typeof(DropDownDataProvider), "dropdown")]
+// [JsonDerivedType(typeof(AnchorCollectionDataProvider), "anchor-list")]
+// [JsonDerivedType(typeof(AnchorDataProvider), "anchor")]
+
+public class DataProviderJsonTypeInfoResolver : DefaultJsonTypeInfoResolver {
+    public override JsonTypeInfo GetTypeInfo(Type type, JsonSerializerOptions options) {
+        JsonTypeInfo jsonTypeInfo = base.GetTypeInfo(type, options);
+
+        Type basePointType = typeof(IDataProvider);
+        if (jsonTypeInfo.Type == basePointType) {
+            jsonTypeInfo.PolymorphismOptions = new JsonPolymorphismOptions {
+                UnknownDerivedTypeHandling = JsonUnknownDerivedTypeHandling.FallBackToNearestAncestor,
+                DerivedTypes = {
+                    new JsonDerivedType(typeof(ParagraphedContentDataProvider), "paragraphed"),
+                    new JsonDerivedType(typeof(ListContentDataProvider), "list"),  
+                    new JsonDerivedType(typeof(ContentsArrayDataProvider), "array"),     
+                    new JsonDerivedType(typeof(ContentsDataProvider), "single"),
+                    new JsonDerivedType(typeof(DropDownDataProvider), "dropdown"),
+                    new JsonDerivedType(typeof(AnchorCollectionDataProvider), "anchor-list"),
+                    new JsonDerivedType(typeof(AnchorDataProvider), "anchor"),
+                }
+            };
+        }
+
+        return jsonTypeInfo;
+    }
+}

Beam.Dynamic/DataProviders/AnchorCollectionDataProvider.cs

@@ -0,0 +1,46 @@
+using HtmlAgilityPack;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Beam.Abstractions;
+
+namespace Beam.Dynamic {
+    public class AnchorCollectionDataProvider : IComposableDataProvider<string[]> {
+        public IBinding? Content { get; set; }
+        public Uri? RelativeTo { get; set; }
+
+        public string[] Get(HtmlDocument document) {
+            var node = Select(document);
+            return node is null ? [] : Get(node);      
+        }
+
+        public string[] Get(HtmlNode node) {
+            List<string> links = [];
+            foreach (var child in node.Descendants()) {
+                var href = child.GetAttributeValue("href", "");
+                if (Uri.TryCreate(RelativeTo, href, out var uri))
+                    links.Add(uri.AbsoluteUri);
+            }
+
+            return links.Where(x => !string.IsNullOrWhiteSpace(x)).ToArray();
+        }
+        
+        public HtmlNode? Select(HtmlDocument doc) {
+            return Content?.Select(doc);       
+        }
+
+        public HtmlNode? Select(HtmlNode node) {
+            return node;
+        }
+
+
+        public HtmlNode[]? SelectMany(HtmlDocument doc) {
+            throw new NotImplementedException();
+        }
+        public HtmlNode[]? SelectMany(HtmlNode[] node) {
+            throw new NotImplementedException();
+        }
+    }
+}

Beam.Dynamic/DataProviders/AnchorDataProvider.cs

@@ -0,0 +1,32 @@
+using HtmlAgilityPack;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Beam.Abstractions;
+
+namespace Beam.Dynamic {
+    public class AnchorDataProvider : IComposableDataProvider<string> {
+        public IBinding? Content { get; set; }
+        public Uri? RelativeTo { get; set; }
+
+        public string Get(HtmlDocument document) {
+            var node = Select(document);
+            return node is null ? "" : Get(node);      
+        }
+
+        public virtual string Get(HtmlNode node) {
+            if (Uri.TryCreate(RelativeTo, node.GetAttributeValue("href", ""), out var uri))
+                return uri.AbsoluteUri;
+            return "";       
+        }
+        public HtmlNode? Select(HtmlDocument doc) {
+            return Content?.Select(doc);       
+        }
+
+        public HtmlNode? Select(HtmlNode node) {
+            return node;
+        }
+    }
+}

Beam.Dynamic/DataProviders/ComposeDataProviders.cs

@@ -0,0 +1,83 @@
+using Beam.Abstractions;
+using HtmlAgilityPack;
+
+namespace Beam.Dynamic;
+
+/// <summary>
+/// Allows composition of different data providers to adapt to different types of data.
+/// </summary>
+/// <typeparam name="T"></typeparam>
+public class ComposeDataProviders<T> : IComposableDataProvider<T> {
+    public required IComposableDataProvider<object>[] SelectWith { get; init; }
+    public required IComposableDataProvider<T> GetWith { get; init; }
+    
+    private ComposeDataProviders() {}
+
+    public static ComposeDataProviders<T> Create(IComposableDataProvider<object> selectWith, IComposableDataProvider<T> getWith) {
+        return new ComposeDataProviders<T>() {
+            GetWith = getWith,
+            SelectWith = [selectWith]
+        };
+    }
+
+    public static ComposeDataProviders<T> Create(IComposableDataProvider<object>[] selectWiths, IComposableDataProvider<T> getWith) {
+        return new ComposeDataProviders<T>() {
+            GetWith = getWith,
+            SelectWith = selectWiths
+        };
+    }
+
+    /// <summary>
+    /// Composes the data providers, first selecting a node with <see cref="SelectWith"/>, then getting the data with <see cref="GetWith"/>.
+    /// </summary>
+    /// <exception cref="Exception">Throws when <see cref="SelectWith"/> returns a null value.</exception>
+    /// <param name="document"></param>
+    /// <returns></returns>
+    public T Get(HtmlDocument document) {
+        var selected = Select(document);
+        if (selected is null)
+            throw new Exception("Selection operation failed.");
+        return GetWith.Get(selected);
+    }
+    
+    /// <summary>
+    /// Uses the <see cref="GetWith"/> data provider to get the data from the supplied node.
+    /// </summary>
+    /// <param name="node"></param>
+    /// <returns></returns>
+    public T Get(HtmlNode node) {
+        return GetWith.Get(node);
+    }
+    
+    /// <summary>
+    /// Uses the <see cref="SelectWith"/> data provider to select a node from the supplied document.
+    /// </summary>
+    /// <param name="doc"></param>
+    /// <returns></returns>
+    public HtmlNode? Select(HtmlDocument doc) {
+        var selected = SelectWith[0].Select(doc);
+        foreach(var provider in SelectWith.Skip(1)) {
+            if (selected is null)
+                return null;
+            selected = provider.Select(selected);
+        }
+
+        return selected;
+    }
+
+    /// <summary>
+    /// Uses the <see cref="SelectWith"/> data provider to select a node from the supplied document.
+    /// </summary>
+    /// <param name="doc"></param>
+    /// <returns></returns>
+    public HtmlNode? Select(HtmlNode node) {
+        var selected = SelectWith[0].Select(node);
+        foreach(var provider in SelectWith.Skip(1)) {
+            if (selected is null)
+                return null;
+            selected = provider.Select(selected);
+        }
+
+        return selected;
+    }
+}

Beam.Dynamic/DataProviders/ContentsArrayDataProvider.cs

@@ -0,0 +1,18 @@
+using Beam.Abstractions;
+using HtmlAgilityPack;
+
+namespace Beam.Dynamic {
+    public class ContentsArrayDataProvider : ContentsDataProvider, IComposableDataProvider<string[]> {
+        public string[] ArrayDelimiters { get; set; } = [";"];
+
+        string[] IDataProvider<string[]>.Get(HtmlDocument document) {
+            var node = Select(document);
+            return node is null ? [] : Get(node);       
+        }
+
+        public new string[] Get(HtmlNode node) {
+            return node.InnerText?.Split(ArrayDelimiters, StringSplitOptions.RemoveEmptyEntries) ?? [];
+        }
+    }
+
+}

Beam.Dynamic/DataProviders/ContentsDataProvider.cs

@@ -0,0 +1,30 @@
+using HtmlAgilityPack;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Beam.Abstractions;
+
+namespace Beam.Dynamic {
+    public class ContentsDataProvider : IComposableDataProvider<string> {
+        public IBinding? Content { get; set; }
+
+        public string Get(HtmlDocument document) {
+            var node = Select(document);
+            return node is null ? "" : Get(node);
+        }
+
+        public string Get(HtmlNode node) {
+            return node.InnerText;
+        }
+        public HtmlNode? Select(HtmlDocument doc) {
+            return Content?.Select(doc);
+        }
+
+        public HtmlNode? Select(HtmlNode node) {
+            return node;
+        }
+    }
+}

Beam.Dynamic/DataProviders/DropDownDataProvider.cs

@@ -0,0 +1,59 @@
+using HtmlAgilityPack;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Runtime.InteropServices.Marshalling;
+using System.Text;
+using System.Text.Json;
+using System.Threading.Tasks;
+using Beam.Abstractions;
+
+namespace Beam.Dynamic;
+
+public class DropDownDataProvider : IComposableDataProvider<string>, IComposableDataProvider<string[]> {
+    public IBinding? Content { get; set; }
+    public Uri? RelativeTo { get; set; }
+
+    public string[] Get(HtmlDocument document) {
+        if (Content is null)
+            return [];
+        var node = Select(document);
+        if (node is null)
+            return [];
+        return Get(node);
+    }
+
+    string IDataProvider<string>.Get(HtmlDocument document) {
+        var node = Select(document);
+        return node is null ? "" : (this as IComposableDataProvider<string>).Get(node);
+    }
+
+    public string[] Get(HtmlNode node) {
+        List<string> links = [];
+        foreach (var child in node.ChildNodes.Where(x => x.Name == "option")) {
+            var childValue = child.GetAttributeValue("value", null);
+            if (!Uri.TryCreate(RelativeTo, childValue, out var uri))
+                continue;
+            links.Add(uri.AbsoluteUri);
+        }
+
+        return links.ToArray();
+    }
+
+    string IComposableDataProvider<string>.Get(HtmlNode node) {
+        return JsonSerializer.Serialize(Get(node));
+    }
+    
+    public HtmlNode? Select(HtmlDocument doc) {
+        return Content?.Select(doc);
+    }
+
+    HtmlNode? IComposableDataProvider<string[]>.Select(HtmlNode node) {
+        return node;
+    }
+
+    HtmlNode? IComposableDataProvider<string>.Select(HtmlNode node) {
+        return node;
+    }
+}

Beam.Dynamic/DataProviders/ListContentDataProvider.cs

@@ -1,18 +1,21 @@
 using HtmlAgilityPack;
 using System.Text;
+using Beam.Abstractions;
 
 namespace Beam.Dynamic {
-    public class ListContentDataProvider : IDataProvider<string> {
+    public class ListContentDataProvider : IComposableDataProvider<string> {
         public IBinding? Content { get; set; }
 
         public string Get(HtmlDocument document) {
             if (Content is null)
                 return "";
 
-            var node = Content.Select(document);
+            var node = Select(document);
-            if (node is null)
+            return node is null ? "" : Get(node);
-                return "";
+        }
 
+        public string Get(HtmlNode node) {
+            
             StringBuilder content = new();
             foreach(var childNode in node.ChildNodes.SkipLast(1)) {
                 if (childNode.Name != "li")
@@ -23,5 +26,12 @@ namespace Beam.Dynamic {
             content.Append(node.ChildNodes.Last().InnerText.Trim());
             return content.ToString();
         }
+        public HtmlNode? Select(HtmlDocument doc) {
+            return Content?.Select(doc);
+        }
+
+        public HtmlNode? Select(HtmlNode node) {
+            return node;
+        }
     }
 }

Beam.Dynamic/DataProviders/ManyAnchorsDataProvider.cs

@@ -0,0 +1,20 @@
+using Beam.Abstractions;
+using HtmlAgilityPack;
+
+namespace Beam.Dynamic;
+
+public class ManyAnchorsDataProvider : AnchorDataProvider, IManySelectionComposableDataProvider<string[]> {
+    public new string[] Get(HtmlDocument document) {
+        return [base.Get(document)];
+    }
+    public string[] ManyGet(HtmlNode[] node) {
+        return node.Select(x => base.Get(x)).ToArray();
+    }
+    public HtmlNode[]? SelectMany(HtmlDocument doc) {
+        var k = Select(doc);
+        return k == null ? null : [k];
+    }
+    public HtmlNode[]? SelectMany(HtmlNode[] node) {
+        return node.Select(x => Select(x) ?? null).Where(x => x is not null).Cast<HtmlNode>().ToArray();
+    }
+}

Beam.Dynamic/DataProviders/ManyComposeDataProviders.cs

@@ -0,0 +1,80 @@
+using Beam.Abstractions;
+using HtmlAgilityPack;
+
+namespace Beam.Dynamic;
+
+
+public class ManyComposeDataProviders<T> : IManySelectionComposableDataProvider<T> {
+    public required IManySelectionComposableDataProvider<object>[] SelectWith { get; init; }
+    public required IManySelectionComposableDataProvider<T> GetWith { get; init; }
+    
+    private ManyComposeDataProviders() {}
+
+    public static ManyComposeDataProviders<T> Create(IManySelectionComposableDataProvider<object> selectWith, IManySelectionComposableDataProvider<T> getWith) {
+        return new ManyComposeDataProviders<T>() {
+            GetWith = getWith,
+            SelectWith = [selectWith]
+        };
+    }
+
+    public static ManyComposeDataProviders<T> Create(IManySelectionComposableDataProvider<object>[] selectWiths, IManySelectionComposableDataProvider<T> getWith) {
+        return new ManyComposeDataProviders<T>() {
+            GetWith = getWith,
+            SelectWith = selectWiths
+        };
+    }
+
+    /// <summary>
+    /// Composes the data providers, first selecting a node with <see cref="SelectWith"/>, then getting the data with <see cref="GetWith"/>.
+    /// </summary>
+    /// <exception cref="Exception">Throws when <see cref="SelectWith"/> returns a null value.</exception>
+    /// <param name="document"></param>
+    /// <returns></returns>
+    public T Get(HtmlDocument document) {
+        var selected = SelectMany(document);
+        if (selected is null)
+            throw new Exception("Selection operation failed.");
+        return GetWith.ManyGet(selected);
+    }
+    
+    /// <summary>
+    /// Uses the <see cref="GetWith"/> data provider to get the data from the supplied node.
+    /// </summary>
+    /// <param name="node"></param>
+    /// <returns></returns>
+    public T ManyGet(HtmlNode[] node) {
+        return GetWith.ManyGet(node);
+    }
+    
+    /// <summary>
+    /// Uses the <see cref="SelectWith"/> data provider to select a node from the supplied document.
+    /// </summary>
+    /// <param name="doc"></param>
+    /// <returns></returns>
+    public HtmlNode[]? SelectMany(HtmlDocument doc) {
+        var selected = SelectWith[0].SelectMany(doc);
+        foreach(var provider in SelectWith.Skip(1)) {
+            if (selected is null)
+                return null;
+            selected = provider.SelectMany(selected);
+        }
+
+        return selected;
+    }
+
+    /// <summary>
+    /// Uses the <see cref="SelectWith"/> data provider to select a node from the supplied document.
+    /// </summary>
+    /// <param name="doc"></param>
+    /// <returns></returns>
+    public HtmlNode[]? SelectMany(HtmlNode[] node) {
+        var selected = SelectWith[0].SelectMany(node);
+        foreach(var provider in SelectWith.Skip(1)) {
+            if (selected is null)
+                return null;
+            selected = provider.SelectMany(selected);
+        }
+
+        return selected;
+    }
+}

Beam.Dynamic/DataProviders/ParagraphedContentDataProvider.cs

@@ -4,9 +4,10 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
+using Beam.Abstractions;
 
 namespace Beam.Dynamic {
-    public class ParagraphedContentDataProvider : IDataProvider<string> {
+    public class ParagraphedContentDataProvider : IComposableDataProvider<string> {
         public IBinding? Content { get; set; }
 
         public string Get(HtmlDocument document) {
@@ -14,9 +15,10 @@ namespace Beam.Dynamic {
                 return "";
 
             var node = Content.Select(document);
-            if (node is null)
+            return node is null ? "" : Get(node);
-                return "";
+        }
 
+        public string Get(HtmlNode node) {
             StringBuilder content = new();
             foreach(var childNode in node.ChildNodes) {
                 if (childNode.Name != "p")
@@ -26,5 +28,12 @@ namespace Beam.Dynamic {
 
             return content.ToString();
         }
+        public HtmlNode? Select(HtmlDocument doc) {
+            return Content?.Select(doc);
+        }
+
+        public HtmlNode? Select(HtmlNode node) {
+            return node;
+        }
     }
 }

Beam.Dynamic/DataProviders/RelationalDataProvider.cs

@@ -0,0 +1,45 @@
+using Beam.Abstractions;
+using HtmlAgilityPack;
+
+namespace Beam.Dynamic;
+
+public enum RelationType {
+    Parent,
+    Child,
+    NextSibling,
+    PreviousSibling,
+}
+
+public class RelationalDataProvider : IComposableDataProvider<HtmlNode?> {
+    
+    public RelationType RelationType { get; set; } = RelationType.Parent;
+    public int Distance { get; set; } = 1;
+    public IBinding? Content { get; set; }
+    
+    public HtmlNode? Get(HtmlDocument document) {
+        return Select(document);
+    }
+    public HtmlNode? Get(HtmlNode node) {
+        return Select(node);
+    }
+    public HtmlNode? Select(HtmlDocument doc) {
+        return Select(Content?.Select(doc) ?? doc.DocumentNode);
+    }
+    public HtmlNode? Select(HtmlNode node) {
+        return _Select(node, Distance);
+    }
+
+    private HtmlNode? _Select(HtmlNode node, int distance = 0) {
+        while (true) {
+            if (distance == 0) return node;
+            node = RelationType switch {
+                RelationType.Parent => node.ParentNode,
+                RelationType.Child => node.FirstChild,
+                RelationType.NextSibling => node.NextSibling,
+                RelationType.PreviousSibling => node.PreviousSibling,
+                _ => throw new NotSupportedException()
+            };
+            distance = distance - 1;
+        }
+    }
+}

Beam.Dynamic/DataProviders/SelectDataProvider.cs

@@ -0,0 +1,155 @@
+using System.Text.RegularExpressions;
+using Beam.Abstractions;
+using HtmlAgilityPack;
+
+namespace Beam.Dynamic;
+
+public enum SearchStrategy {
+    DepthFirst,
+    BreadthFirst,
+}
+
+public enum SearchStringDefaultSelection {
+    First,
+    Last,
+    GreatestChildren,
+    Any,
+    None,
+}
+
+public class SearchStringOptions {
+    public required bool SearchStringIsRegex { get; set; }
+    public required bool SearchInBody { get; set; }
+    public required string? SearchInAttribute { get; set; }
+    
+    /// <summary>
+    /// Only used when both <see cref="SearchInBody"/> and <see cref="SearchInAttribute"/> are false/null, or no match is found for the search criteria.
+    /// </summary>
+    public SearchStringDefaultSelection DefaultSelection { get; set; } = SearchStringDefaultSelection.First;
+    
+    /// <summary>
+    /// Only used when <see cref="SearchStringIsRegex"/> is false.
+    /// </summary>
+    public IEqualityComparer<string> UseComparer { get; set; } = StringComparer.CurrentCulture;
+}
+
+public class SelectDataProvider : IComposableDataProvider<HtmlNode?>, IManySelectionComposableDataProvider<HtmlNode?> {
+    public SearchStrategy SearchStrategyType { get; set; } = SearchStrategy.DepthFirst;
+    public SearchStringOptions SearchStringOptions { get; set; } = new SearchStringOptions() {
+        SearchStringIsRegex = false,
+        SearchInBody = true,
+        SearchInAttribute = null
+    };
+    
+    public string? SearchString { get; set; }
+    public IBinding? Content { get; set; }
+    
+    /// <summary>
+    /// Returns the first node that matches the search criteria.
+    /// </summary>
+    /// <param name="document"></param>
+    /// <returns></returns>
+    public HtmlNode? Get(HtmlDocument document) {
+        return Select(document);
+    }
+    /// <summary>
+    /// Returns the first child node that matches the search criteria.
+    /// </summary>
+    /// <param name="node"></param>
+    /// <returns></returns>
+    public HtmlNode? Get(HtmlNode node) {
+        return Select(node);
+    }
+
+    public HtmlNode? Get(HtmlNode[] node) {
+        throw new NotSupportedException();
+    }
+    
+    public HtmlNode[]? _Select(HtmlNode node) {
+        LinkedList<HtmlNode> searchSet = new();
+        LinkedListNode<HtmlNode> currentNode = searchSet.AddLast(node);
+        HashSet<HtmlNode> visited = [node];
+        
+        void breadthFirst(HtmlNode node) {
+            foreach (var child in node.ChildNodes) {
+                if (visited.Contains(child))
+                    continue;
+                searchSet.AddLast(child);
+                visited.Add(child);
+            }
+        }
+
+        void depthFirst(HtmlNode node) {
+            foreach (var child in node.ChildNodes.Reverse()) {
+                if (visited.Contains(child))
+                    continue;
+                searchSet.AddAfter(currentNode, child);
+                visited.Add(child);
+            }
+        }
+
+        Action<HtmlNode> enqueueStartegy = SearchStrategyType switch {
+            SearchStrategy.BreadthFirst => breadthFirst,
+            SearchStrategy.DepthFirst => depthFirst,
+            _ => throw new NotSupportedException()
+        };
+
+        var bestCandidate = currentNode.Value;
+        List<HtmlNode> selected = [];
+        
+        do {
+            var n = currentNode.Value;
+            if (SearchStringOptions.SearchInBody)
+                if (SearchStringOptions.SearchStringIsRegex && Regex.IsMatch(n.InnerText ?? "", SearchString ?? ""))
+                    selected.Add(n);
+                else if (SearchStringOptions.UseComparer.Equals(n.InnerText, SearchString ?? ""))
+                    selected.Add(n);
+            if (SearchStringOptions.SearchInAttribute is not null)
+                if (SearchStringOptions.SearchStringIsRegex && n.GetAttributeValue(SearchStringOptions.SearchInAttribute, null) != null &&
+                    Regex.IsMatch(n.GetAttributeValue(SearchStringOptions.SearchInAttribute, ""), SearchString ?? ""))
+                    selected.Add(n);
+                else if (SearchStringOptions.UseComparer.Equals(n.GetAttributeValue(SearchStringOptions.SearchInAttribute, null), SearchString ?? ""))
+                    selected.Add(n);
+
+            switch (SearchStringOptions.DefaultSelection) {
+                case SearchStringDefaultSelection.GreatestChildren:
+                    if (n.ChildNodes.Count > bestCandidate.ChildNodes.Count)
+                        bestCandidate = n;
+                    break;
+                case SearchStringDefaultSelection.Last:
+                    bestCandidate = n;
+                    break;
+                case SearchStringDefaultSelection.Any:
+                case SearchStringDefaultSelection.First:
+                case SearchStringDefaultSelection.None:
+                default:
+                    break;
+            }
+            enqueueStartegy(n);
+
+        } while ((currentNode = currentNode.Next!) != null);
+
+        if (selected.Count == 0 && SearchStringOptions.DefaultSelection != SearchStringDefaultSelection.None)
+            selected.Add(bestCandidate);
+        
+        return selected.ToArray();
+    }
+
+    public HtmlNode? Select(HtmlDocument document) {
+        return Select(Content?.Select(document) ?? document.DocumentNode);
+    }
+    
+    public HtmlNode? Select(HtmlNode node) {
+        return _Select(node)?.FirstOrDefault();
+    }
+
+    public HtmlNode? ManyGet(HtmlNode[] node) {
+        throw new NotSupportedException();
+    }
+    public HtmlNode[]? SelectMany(HtmlDocument doc) {
+        return _Select(Content?.Select(doc) ?? doc.DocumentNode);
+    }
+    public HtmlNode[]? SelectMany(HtmlNode[] node) {
+        return node.SelectMany(x => _Select(x) ?? []).ToArray();
+    }
+}

Beam.Dynamic/DataProviders/TableDataProvider.cs

@@ -0,0 +1,154 @@
+
+using System.Text.Json;
+using Beam.Abstractions;
+using HtmlAgilityPack;
+
+namespace Beam.Dynamic;
+
+public class TableDataProvider
+    : IComposableDataProvider<string>,
+      IComposableDataProvider<string[][]>
+{
+    public IBinding? Content { get; set; }
+
+    /// <summary>
+    /// One provider per column. Each provider is executed per row.
+    /// Missing columns are filled with defaults that return the td/th text at that column index.
+    /// </summary>
+    public IDataProvider<string>[]? ColumnProviders { get; set; }
+
+    public string[][] Get(HtmlDocument document)
+    {
+        if (Content is null)
+            return [];
+
+        var node = Select(document);
+        if (node is null)
+            return [];
+
+        return Get(node);
+    }
+
+    string IDataProvider<string>.Get(HtmlDocument document)
+    {
+        var node = Select(document);
+        return node is null ? "" : (this as IComposableDataProvider<string>).Get(node);
+    }
+
+    public string[][] Get(HtmlNode node)
+    {
+        var rows = node.Descendants("tr").ToList();
+        if (rows.Count == 0)
+            return [];
+
+        // Determine how many columns we should output:
+        // max of provided providers length and max cell count across rows.
+        var maxCellsInAnyRow = rows
+            .Select(r => r.ChildNodes.Count(n => n.Name == "td" || n.Name == "th"))
+            .DefaultIfEmpty(0)
+            .Max();
+
+        var providedCount = ColumnProviders?.Length ?? 0;
+        var columnCount = Math.Max(providedCount, maxCellsInAnyRow);
+
+        if (columnCount == 0)
+            return [];
+
+        var effectiveProviders = BuildEffectiveProviders(columnCount);
+
+        var result = new string[rows.Count][];
+        for (int r = 0; r < rows.Count; r++)
+        {
+            var rowNode = rows[r];
+            var rowOut = new string[columnCount];
+
+            for (int c = 0; c < columnCount; c++)
+            {
+                var provider = effectiveProviders[c];
+
+                if (provider is IComposableDataProvider<string> composable)
+                {
+                    // Execute with row context.
+                    rowOut[c] = composable.Get(rowNode);
+                }
+                else
+                {
+                    // Fallback to document context.
+                    rowOut[c] = provider.Get(rowNode.OwnerDocument);
+                }
+
+                rowOut[c] ??= "";
+            }
+
+            result[r] = rowOut;
+        }
+
+        return result;
+    }
+
+    string IComposableDataProvider<string>.Get(HtmlNode node)
+    {
+        return JsonSerializer.Serialize(Get(node));
+    }
+
+    public HtmlNode? Select(HtmlDocument doc) => Content?.Select(doc);
+
+    HtmlNode? IComposableDataProvider<string[][]>.Select(HtmlNode node) => node;
+    HtmlNode? IComposableDataProvider<string>.Select(HtmlNode node) => node;
+
+    private IDataProvider<string>[] BuildEffectiveProviders(int columnCount)
+    {
+        var effective = new IDataProvider<string>[columnCount];
+
+        if (ColumnProviders is null || ColumnProviders.Length == 0)
+        {
+            for (int i = 0; i < columnCount; i++)
+                effective[i] = new ColumnCellContentsProvider(i);
+            return effective;
+        }
+
+        var maxCopy = Math.Min(ColumnProviders.Length, columnCount);
+        for (int i = 0; i < maxCopy; i++)
+            effective[i] = ColumnProviders[i] ?? new ColumnCellContentsProvider(i);
+
+        for (int i = maxCopy; i < columnCount; i++)
+            effective[i] = new ColumnCellContentsProvider(i);
+
+        return effective;
+    }
+
+    /// <summary>
+    /// Default column provider: for a given row, returns text of td/th at ColumnIndex.
+    /// </summary>
+    private sealed class ColumnCellContentsProvider : IComposableDataProvider<string>
+    {
+        public int ColumnIndex { get; }
+
+        public ColumnCellContentsProvider(int columnIndex)
+        {
+            ColumnIndex = columnIndex;
+        }
+
+        public string Get(HtmlDocument document)
+        {
+            var node = Select(document);
+            return node is null ? "" : Get(node);
+        }
+
+        public string Get(HtmlNode rowNode)
+        {
+            var cells = rowNode
+                .ChildNodes
+                .Where(n => n.Name == "td" || n.Name == "th")
+                .ToList();
+
+            if (ColumnIndex < 0 || ColumnIndex >= cells.Count)
+                return "";
+
+            return cells[ColumnIndex].InnerText;
+        }
+
+        public HtmlNode? Select(HtmlDocument doc) => doc.DocumentNode;
+        public HtmlNode? Select(HtmlNode node) => node;
+    }
+}

Beam.Dynamic/DropDownDataProvider.cs

@@ -1,55 +0,0 @@
-using HtmlAgilityPack;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Runtime.InteropServices;
-using System.Runtime.InteropServices.Marshalling;
-using System.Text;
-using System.Text.Json;
-using System.Threading.Tasks;
-
-namespace Beam.Dynamic {
-    public class DropDownDataProvider
-            : IDataProvider<string>, 
-              IDataProvider<string[]>, 
-              IDataProvider<SourceLink[]> {
-        public IBinding? Content { get; set; }
-        public string? RelativeTo { get; set; } 
-
-        private string GetAbsolute(string? @base, string relative) {
-            if (@base is null)
-                return relative;
-
-            if (@base.EndsWith('/'))
-                @base = @base[..^1];
-            if (relative.StartsWith('/'))
-                relative = relative[1..];
-            return @base + '/' + relative;
-        }
-
-        public SourceLink[] Get(HtmlDocument document) {
-            if (Content is null)
-                return [];
-            var node = Content.Select(document);
-            if (node is null)
-                return [];
-            List<SourceLink> links = [];
-            foreach (var child in node.ChildNodes.Where(x => x.Name == "option")) {
-                var childValue = child.GetAttributeValue("value", null);
-                if (!Uri.TryCreate(GetAbsolute(RelativeTo, childValue), UriKind.Absolute, out _))
-                    continue;
-                links.Add(new SourceLink(GetAbsolute(RelativeTo, childValue)));
-            }
-
-            return links.ToArray();
-        }
-
-        string[] IDataProvider<string[]>.Get(HtmlDocument document) {
-            return this.Get(document).Select(x => x.Link.AbsoluteUri).ToArray();
-        }
-
-        string IDataProvider<string>.Get(HtmlDocument document) {
-            return JsonSerializer.Serialize(this.Get(document));
-        }
-    }
-}

Beam.Dynamic/IDataProvider.cs

@@ -1,21 +0,0 @@
-using HtmlAgilityPack;
-using System.Text.Json.Serialization;
-
-namespace Beam.Dynamic {
-    [JsonDerivedType(typeof(ParagraphedContentDataProvider), "paragraphed")]
-    [JsonDerivedType(typeof(ListContentDataProvider), "list")]
-    [JsonDerivedType(typeof(ContentsArrayDataProvider), "array")]
-    [JsonDerivedType(typeof(ContentsDataProvider), "single")]
-    [JsonDerivedType(typeof(DropDownDataProvider), "dropdown")]
-    [JsonDerivedType(typeof(AnchorCollectionDataProvider), "anchor-list")]
-    [JsonDerivedType(typeof(AnchorDataProvider), "anchor")]
-    public interface IDataProvider {
-        public string GetString(HtmlDocument document)
-            => (this as IDataProvider<object>)?.Get(document)?.ToString() ?? "";
-    }
-
-    public interface IDataProvider<out T> : IDataProvider {
-        public T Get(HtmlDocument document);
-        //public HtmlNode? GetNode(HtmlDocument document);
-    }
-}

Beam.Dynamic/MainArchitecture.cs

@@ -1,9 +1,7 @@
 using aeqw89.DataKeys;
-using Beam.Dynamic;
+using Beam.Abstractions;
-using HtmlAgilityPack;
-using Microsoft.Extensions.Logging;
 
-namespace Beam.Temporary.Cli {
+namespace Beam.Dynamic {
     public partial interface IArchitecture {
         private class MainArchitecture : IArchitecture {
             public MainArchitecture() { }

Beam.Dynamic/NumberedStateChanger.cs

@@ -1,15 +1,17 @@
-namespace Beam {
+using Beam.Abstractions;
+
+namespace Beam.Dynamic {
     public class NumberedStateChanger(NumberedStateChanger.MoveState moveState) : IStateChangeBehaviour {
-        public delegate void MoveState(State state, int amount);
+        public delegate void MoveState(IState state, int amount);
         public MoveState MoveStateDlgte { get; set; } = moveState;
 
-        public virtual void Apply(State state, object stimulus) {
+        public virtual void Apply(IState state, object stimulus) {
             if (stimulus is not int amount)
-                throw new ArgumentException(S.M.StimulusMustBeInt, nameof(stimulus));
+                throw new ArgumentException(string.Format(Exceptions.Exceptions.num_state_changer_stimulus_must_be_int, stimulus.GetType().Name), nameof(stimulus));
             Apply(state, amount);
         }
 
-        public virtual void Apply(State state, int amount) {
+        public virtual void Apply(IState state, int amount) {
             MoveStateDlgte(state, amount);
         }
 

Beam.Dynamic/StateChangerFactory.cs

@@ -4,9 +4,10 @@ using System.Linq;
 using System.Text;
 using System.Text.Json.Serialization;
 using System.Threading.Tasks;
+using Beam.Abstractions;
 
 namespace Beam.Dynamic {
-    public class StateChangerFactory {
+    public class StateChangerFactory : IStateChangerFactory {
         [JsonIgnore]
         public IStateChangeBehaviour Behavior => FactoryTable[StateChangerKey]();
         

Beam.Dynamic/StringCleaner.cs

@@ -10,7 +10,7 @@ using System.Threading.Tasks;
 using System.Web;
 
 namespace Beam.Dynamic {
-    public static partial class OnlineCleaner {
+    public static partial class StringCleaner {
         [GeneratedRegex("&#x?[\\d\\w]{1,4};")]
         public static partial Regex MochaBlendUnicodeEscapeSequence();
 

Beam.Exceptions/AssertionException.cs

@@ -0,0 +1,14 @@
+namespace Beam.Exceptions;
+
+/// <summary>
+/// The kind of exception that should never happen
+/// </summary>
+[Serializable]
+public class AssertionException : Exception {
+    public AssertionException() { }
+    public AssertionException(string message) : base(message) { }
+    public AssertionException(string message, Exception inner) : base(message, inner) { }
+    protected AssertionException(
+        System.Runtime.Serialization.SerializationInfo info,
+        System.Runtime.Serialization.StreamingContext context) : base(info, context) { }
+}

Beam.Exceptions/Beam.Exceptions.csproj

@@ -0,0 +1,24 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net9.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <EmbeddedResource Update="Exceptions.resx">
+        <Generator>PublicResXFileCodeGenerator</Generator>
+        <LastGenOutput>Exceptions.Designer.cs</LastGenOutput>
+      </EmbeddedResource>
+    </ItemGroup>
+
+    <ItemGroup>
+      <Compile Update="Exceptions.Designer.cs">
+        <DesignTime>True</DesignTime>
+        <AutoGen>True</AutoGen>
+        <DependentUpon>Exceptions.resx</DependentUpon>
+      </Compile>
+    </ItemGroup>
+
+</Project>

Beam.Exceptions/Exceptions.Designer.cs

@@ -0,0 +1,188 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+namespace Beam.Exceptions {
+    using System;
+    
+    
+    /// <summary>
+    ///   A strongly-typed resource class, for looking up localized strings, etc.
+    /// </summary>
+    // This class was auto-generated by the StronglyTypedResourceBuilder
+    // class via a tool like ResGen or Visual Studio.
+    // To add or remove a member, edit your .ResX file then rerun ResGen
+    // with the /str option, or rebuild your VS project.
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("System.Resources.Tools.StronglyTypedResourceBuilder", "4.0.0.0")]
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+    [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+    public class Exceptions {
+        
+        private static global::System.Resources.ResourceManager resourceMan;
+        
+        private static global::System.Globalization.CultureInfo resourceCulture;
+        
+        [global::System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
+        internal Exceptions() {
+        }
+        
+        /// <summary>
+        ///   Returns the cached ResourceManager instance used by this class.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        public static global::System.Resources.ResourceManager ResourceManager {
+            get {
+                if (object.ReferenceEquals(resourceMan, null)) {
+                    global::System.Resources.ResourceManager temp = new global::System.Resources.ResourceManager("Beam.Exceptions.Exceptions", typeof(Exceptions).Assembly);
+                    resourceMan = temp;
+                }
+                return resourceMan;
+            }
+        }
+        
+        /// <summary>
+        ///   Overrides the current thread's CurrentUICulture property for all
+        ///   resource lookups using this strongly typed resource class.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        public static global::System.Globalization.CultureInfo Culture {
+            get {
+                return resourceCulture;
+            }
+            set {
+                resourceCulture = value;
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to The state of the builder is invalid..
+        /// </summary>
+        public static string fluent_invalid_state {
+            get {
+                return ResourceManager.GetString("fluent_invalid_state", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to A type conversion from &apos;{0}&apos; to &apos;{1}&apos; has failed, indicating an invalid state..
+        /// </summary>
+        public static string fluent_type_conversion_failure {
+            get {
+                return ResourceManager.GetString("fluent_type_conversion_failure", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to The builder state &apos;{0}&apos; points to an unsupported unit downloader..
+        /// </summary>
+        public static string fluent_unsupported_pattern {
+            get {
+                return ResourceManager.GetString("fluent_unsupported_pattern", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to The transformer type &apos;{0}&apos; is unsupported by this fluent pathway. Consider manually instantiating DownloadContext..
+        /// </summary>
+        public static string fluent_unsupported_transformer {
+            get {
+                return ResourceManager.GetString("fluent_unsupported_transformer", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to A fragment is locked when it should be free; failed to obtain updater..
+        /// </summary>
+        public static string fragment_locked {
+            get {
+                return ResourceManager.GetString("fragment_locked", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to The argument at index &apos;{0}&apos; with name &apos;{1}&apos; is not marked optional and is missing..
+        /// </summary>
+        public static string link_builder_argument_missing {
+            get {
+                return ResourceManager.GetString("link_builder_argument_missing", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to The flag &apos;{0}&apos; is incompatible with the flag(s) &apos;{1}&apos;.
+        /// </summary>
+        public static string link_builder_incompatible_flag {
+            get {
+                return ResourceManager.GetString("link_builder_incompatible_flag", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to The query flag is only allowed on the last segment; found on segment index &apos;{0}&apos;.
+        /// </summary>
+        public static string link_builder_query_only_at_last {
+            get {
+                return ResourceManager.GetString("link_builder_query_only_at_last", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to The stimulus must be an integer; got &apos;{0}&apos;.
+        /// </summary>
+        public static string num_state_changer_stimulus_must_be_int {
+            get {
+                return ResourceManager.GetString("num_state_changer_stimulus_must_be_int", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to There must be at least one state in resource definition..
+        /// </summary>
+        public static string resource_definition_invalid_states_count {
+            get {
+                return ResourceManager.GetString("resource_definition_invalid_states_count", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to Encountered an error while changing state.
+        /// </summary>
+        public static string state_change_error {
+            get {
+                return ResourceManager.GetString("state_change_error", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to Could not open a filestream to a non-existant directory &apos;{0}&apos;..
+        /// </summary>
+        public static string unit_download_directory_nonexistant {
+            get {
+                return ResourceManager.GetString("unit_download_directory_nonexistant", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to The memory stream was created with an invisible inner byte array..
+        /// </summary>
+        public static string unit_download_invalid_memory_stream {
+            get {
+                return ResourceManager.GetString("unit_download_invalid_memory_stream", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to The base unit downloader class only supports RawType&apos;s of string and ByteDocument..
+        /// </summary>
+        public static string unit_downloader_limited_support {
+            get {
+                return ResourceManager.GetString("unit_downloader_limited_support", resourceCulture);
+            }
+        }
+    }
+}

Beam.Exceptions/Exceptions.resx

@@ -0,0 +1,63 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<root>
+    <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+        <xsd:element name="root" msdata:IsDataSet="true">
+            
+        </xsd:element>
+    </xsd:schema>
+    <resheader name="resmimetype">
+        <value>text/microsoft-resx</value>
+    </resheader>
+    <resheader name="version">
+        <value>1.3</value>
+    </resheader>
+    <resheader name="reader">
+        <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+    </resheader>
+    <resheader name="writer">
+        <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+    </resheader>
+    <data name="link_builder_argument_missing" xml:space="preserve">
+        <value>The argument at index '{0}' with name '{1}' is not marked optional and is missing.</value>
+    </data>
+    <data name="link_builder_incompatible_flag" xml:space="preserve">
+        <value>The flag '{0}' is incompatible with the flag(s) '{1}'</value>
+    </data>
+    <data name="link_builder_query_only_at_last" xml:space="preserve">
+        <value>The query flag is only allowed on the last segment; found on segment index '{0}'</value>
+    </data>
+    <data name="num_state_changer_stimulus_must_be_int" xml:space="preserve">
+        <value>The stimulus must be an integer; got '{0}'</value>
+    </data>
+    <data name="state_change_error" xml:space="preserve">
+        <value>Encountered an error while changing state</value>
+    </data>
+    <data name="fragment_locked" xml:space="preserve">
+        <value>A fragment is locked when it should be free; failed to obtain updater.</value>
+    </data>
+    <data name="fluent_unsupported_transformer" xml:space="preserve">
+        <value>The transformer type '{0}' is unsupported by this fluent pathway. Consider manually instantiating DownloadContext.</value>
+    </data>
+    <data name="fluent_invalid_state" xml:space="preserve">
+        <value>The state of the builder is invalid.</value>
+    </data>
+    <data name="fluent_type_conversion_failure" xml:space="preserve">
+        <value>A type conversion from '{0}' to '{1}' has failed, indicating an invalid state.</value>
+    </data>
+    <data name="fluent_unsupported_pattern" xml:space="preserve">
+        <value>The builder state '{0}' points to an unsupported unit downloader.</value>
+    </data>
+    <data name="resource_definition_invalid_states_count" xml:space="preserve">
+        <value>There must be at least one state in resource definition.</value>
+    </data>
+    <data name="unit_download_directory_nonexistant" xml:space="preserve">
+        <value>Could not open a filestream to a non-existant directory '{0}'.</value>
+    </data>
+    <data name="unit_download_invalid_memory_stream" xml:space="preserve">
+        <value>The memory stream was created with an invisible inner byte array.</value>
+    </data>
+    <data name="unit_downloader_limited_support" xml:space="preserve">
+        <value>The base unit downloader class only supports RawType's of string and ByteDocument.</value>
+    </data>
+</root>

Beam.Exceptions/MapException.cs

@@ -0,0 +1,11 @@
+namespace Beam.Exceptions;
+
+[Serializable]
+public class MapException : ArgumentException {
+    public MapException() { }
+    public MapException(string message) : base(message) { }
+    public MapException(string message, Exception inner) : base(message, inner) { }
+    protected MapException(
+        System.Runtime.Serialization.SerializationInfo info,
+        System.Runtime.Serialization.StreamingContext context) : base(info, context) { }
+}

Beam.Exports/Beam.Exports.csproj

@@ -6,11 +6,9 @@
         <Nullable>enable</Nullable>
     </PropertyGroup>
     <ItemGroup>
-	  
+      <ProjectReference Include="..\Beam.Models\Beam.Models.csproj" />
   </ItemGroup>
     <ItemGroup>
-        <ProjectReference Include="..\Beam\Beam.csproj">
+
-            <PrivateAssets>all</PrivateAssets>
-        </ProjectReference>
     </ItemGroup>
 </Project>

Beam.Exports/Exporter.cs

@@ -1,8 +1,11 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Net;
 using System.Text;
 using System.Threading.Tasks;
+using Beam.Abstractions;
+using Beam.Models;
 
 namespace Beam.Exports {
     public class PlainTextExporter : IExporter, IAsyncExporter {
@@ -24,14 +27,14 @@ namespace Beam.Exports {
             var text = Convert();
             if (!Directory.Exists(Path.GetDirectoryName(path)))
                 throw new ArgumentException(S.M.FileDirectoryDoesNotExist, nameof(path));
-            File.WriteAllText(path, text, Encoding.Unicode);
+            System.IO.File.WriteAllText(path, text, Encoding.Unicode);
         }
 
         public virtual async Task WriteAsync(string path) {
             var text = await ConvertAsync();
             if (!Directory.Exists(path))
                 throw new ArgumentException(S.M.FileDirectoryDoesNotExist, nameof(path));
-            await File.WriteAllTextAsync(path, text);
+            await System.IO.File.WriteAllTextAsync(path, text);
         }
     }
 }

Beam.Exports/HtmlExporter.cs

@@ -1,4 +1,6 @@
 using System.Text;
+using Beam.Abstractions;
+using Beam.Models;
 
 namespace Beam.Exports {
     public class HtmlExporter : PlainTextExporter {

Beam.Fluent/Beam.Fluent.csproj

@@ -6,17 +6,19 @@
         <Nullable>enable</Nullable>
     </PropertyGroup>
     <ItemGroup>
-        <PackageReference Include="aeqw89.DataKeys" Version="2.0.1" />
+        <PackageReference Include="aeqw89.DataKeys" Version="2.1.1" />
-        <PackageReference Include="aeqw89.PersistentData" Version="1.1.0" />
+        <PackageReference Include="aeqw89.PersistentData" Version="1.4.5" />
-        <PackageReference Include="Microsoft.Extensions.Logging" Version="9.0.7" />
+        <PackageReference Include="Microsoft.Extensions.Logging" Version="9.0.9" />
-        <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="9.0.7" />
+        <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="9.0.9" />
-        <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="9.0.7" />
+        <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="9.0.9" />
-        <PackageReference Include="System.Linq.Async" Version="6.0.1" />
     </ItemGroup>
     <ItemGroup>
+        <ProjectReference Include="..\Beam.Data\Beam.Data.csproj" />
+        <ProjectReference Include="..\Beam.Downloaders\Beam.Downloaders.csproj" />
         <ProjectReference Include="..\Beam.Dynamic\Beam.Dynamic.csproj">
             <PrivateAssets>all</PrivateAssets>
         </ProjectReference>
+        <ProjectReference Include="..\Beam.Exceptions\Beam.Exceptions.csproj" />
         <ProjectReference Include="..\Beam.Models\Beam.Models.csproj" />
         <ProjectReference Include="..\Beam.Playwright\Beam.Playwright.csproj">
             <PrivateAssets>all</PrivateAssets>
@@ -24,8 +26,6 @@
         <ProjectReference Include="..\Beam.Stealth\Beam.Stealth.csproj">
             <PrivateAssets>all</PrivateAssets>
         </ProjectReference>
-        <ProjectReference Include="..\Beam\Beam.csproj">
+        <ProjectReference Include="..\Beam\Beam.csproj" />
-            <PrivateAssets>all</PrivateAssets>
-        </ProjectReference>
     </ItemGroup>
 </Project>

Beam.Fluent/ContextStage.cs

@@ -0,0 +1,189 @@
+using Beam.Models;
+using HtmlAgilityPack;
+using Beam.Playwright;
+using Beam.Stealth;
+using Beam;
+using Beam.Abstractions;
+using Beam.Downloaders;
+
+namespace Beam.Fluent;
+
+internal sealed class ContextStage<OutType> : IContextStage<OutType> {
+    private readonly DownloadContextBuilder _ctxBuilder;
+    private readonly AsyncTransformer<ByteDocument, OutType> _transformer;
+    private FragmentMode _fragmentMode = FragmentMode.Single;
+    private Channel _channel = Channel.Plain;
+    private readonly ContentKind _contentKind;
+    private int _parallelism = 4;
+    private UnitDownloaderOptionsBuilder<OutType> _optionsBuilder = new();
+
+    // ──────────────── playwright ────────────────
+    private PlaywrightAsyncManipulator? _playwrightManipulator = null;
+    // ────────────────────────────────────────────
+
+    // ──────────────── stealth ───────────────────
+    private StealthAsyncManipulator? _stealthManipulator = null;
+    private StealthConfig? _stealthConfig = null;
+    // ────────────────────────────────────────────
+
+
+    public ContextStage(DownloadContextBuilder ctxBuilder,
+        AsyncTransformer<ByteDocument, OutType> transformer) {
+        _ctxBuilder = ctxBuilder;
+        _transformer = transformer;
+        _contentKind = transformer switch {
+            AsyncTransformer<StringDocument, OutType> => ContentKind.File,
+            AsyncTransformer<ByteDocument, OutType> => ContentKind.Binary,
+            _ => throw new ArgumentException(string.Format(Exceptions.Exceptions.fluent_unsupported_transformer,
+                transformer.GetType()
+                    .AsUniqueName()))
+        };
+
+        _optionsBuilder
+            .WithAsyncTransformer(_transformer);
+    }
+
+    public IContextStage<OutType> Configure(Action<DownloadContextBuilder> configure) {
+        configure(_ctxBuilder);
+        return this;
+    }
+
+    public IContextStage<OutType> ConfigureUnitDownloaderOptions(
+        Action<UnitDownloaderOptionsBuilder< OutType>> configure) {
+        configure(_optionsBuilder);
+        return this;
+    }
+
+    public IContextStage< OutType> WithParallelism(int degree) {
+        _parallelism = Math.Max(1, degree);
+        return this;
+    }
+
+    public IContextStage< OutType> WithTimeout(TimeSpan timeout) {
+        _ctxBuilder.WithTimeOut(timeout);
+        return this;
+    }
+
+    public IContextStage< OutType> WithRetryReporter(IProgress<IRetryReport> reporter) {
+        _ctxBuilder.WithRetryReporter(reporter);
+        return this;
+    }
+
+    /// <summary>
+    /// Uses fragments to download multiple links in parallel. This strategy is mutually exclusive with <see cref="UsePlaywright(PlaywrightAsyncManipulator)"/>
+    /// </summary>
+    /// <returns></returns>
+    public IContextStage< OutType> UseFragments() {
+        if (_playwrightManipulator is not null)
+            _playwrightManipulator = null;
+        if (_channel == Channel.Playwright)
+            _channel = Channel.Plain;
+
+        _fragmentMode = FragmentMode.Fragmented;
+        return this;
+    }
+
+    /// <summary>
+    /// Use a puppet browser to download the links. This strategy is mutually exclusive with <see cref="UseFragments"/>
+    /// </summary>
+    /// <param name="manipulator">The page manipulator</param>
+    /// <returns></returns>
+    public IContextStage< OutType> UsePlaywright(PlaywrightAsyncManipulator manipulator) {
+        if (_fragmentMode == FragmentMode.Fragmented)
+            _fragmentMode = FragmentMode.Single;
+        if (_stealthManipulator is not null)
+            _stealthManipulator = null;
+
+        _channel = Channel.Playwright;
+        _playwrightManipulator = manipulator;
+        return this;
+    }
+
+    public IContextStage< OutType> UseStealth(StealthAsyncManipulator manipulator, StealthConfig config) {
+        if (_playwrightManipulator is not null)
+            _playwrightManipulator = null;
+
+        _channel = Channel.Stealth;
+        _stealthManipulator = manipulator;
+        _stealthConfig = config;
+        return this;
+    }
+
+    private object ConstructUnitDownloader(DownloadContext context) {
+        #region Utility functions
+
+        T To<T>(object? o) where T : class
+            => (o as T) ??
+               throw new Exception(
+                   string.Format(Exceptions.Exceptions.fluent_type_conversion_failure,
+                       o?.GetType().AsUniqueName() ?? "null", typeof(T).AsUniqueName()));
+
+        AsyncTransformer<StringDocument, OutType> FileTransformer()
+            => To<AsyncTransformer<StringDocument, OutType>>(_transformer);
+
+        AsyncTransformer<ByteDocument, OutType> ByteTransformer()
+            => To<AsyncTransformer<ByteDocument, OutType>>(_transformer);
+
+        AsyncDownloadFailurePredicate<StringDocument>[] FileFailurePredicates()
+            => To<AsyncDownloadFailurePredicate<StringDocument>[]>(context.AsyncFailurePredicates);
+
+        AsyncDownloadFailurePredicate<ByteDocument>[] ByteFailurePredicates()
+            => To<AsyncDownloadFailurePredicate<ByteDocument>[]>(context.AsyncFailurePredicates);
+
+        T EnsureExists<T>(T? o) where T : class
+            => (o ?? throw new Exception(Exceptions.Exceptions.fluent_invalid_state));
+
+        #endregion
+
+        if (context.AsyncFailurePredicates is not null)
+            _optionsBuilder
+                .WithFailurePredicates(x => x.WithPredicates(context.AsyncFailurePredicates));
+        var options = _optionsBuilder
+            .WithClient(context.Client)
+            .Build();
+
+        return (_channel, _fragmentMode, _contentKind) switch {
+            // ────────────────  fragmented  ────────────────
+            (Channel.Plain, FragmentMode.Fragmented, _)
+                => new UnitFragmentDownloader< OutType>(options),
+            // ────────────────  single      ────────────────
+            (Channel.Plain, FragmentMode.Single, _)
+                => new UnitDownloader< OutType>(options),
+            // ────────────────  single playwright ────────────────
+            (Channel.Playwright, FragmentMode.Single, _)
+                => new PlaywrightUnitDownloader< OutType>(options, EnsureExists(_playwrightManipulator)),
+            // ────────────────  single stealth ────────────────
+            (Channel.Stealth, FragmentMode.Single, ContentKind.Binary)
+                => new StealthUnitDownloader< OutType>(options, EnsureExists(_stealthConfig), EnsureExists(_stealthManipulator)),
+            // ────────────────  fragment stealth  ────────────────
+            (Channel.Stealth, FragmentMode.Fragmented, ContentKind.Binary)
+                => new StealthFragmentDownloader< OutType>(options,
+                    EnsureExists(_stealthConfig),
+                    EnsureExists(_stealthManipulator)),
+            _ => throw new Exception(string.Format(Exceptions.Exceptions.fluent_unsupported_pattern,
+                $"({_channel}, {_fragmentMode}, {_contentKind})")),
+        };
+    }
+
+    private IAsyncEnumerator<Ordered<OutType>> ConstructDownloader(DownloadContext context) {
+        var copyOfContext = DownloadContextBuilder.FromContext(context).Build();
+        return _fragmentMode switch {
+            FragmentMode.Fragmented => new SequentialFragmentDownloader<OutType>(
+                copyOfContext,
+                ctx => (IUnitDownloader<Fragment<Ordered<OutType>>>)ConstructUnitDownloader(ctx),
+                context.DownloadLogger).UnwrapFragmented(),
+            FragmentMode.Single => new SequentialDownloader< OutType>(
+                copyOfContext,
+                ctx => (IUnitDownloader<OutType>)ConstructUnitDownloader(ctx),
+                context.DownloadLogger).WrapOrdered(),
+            _ => throw new Exception(string.Format(Exceptions.Exceptions.fluent_unsupported_pattern,
+                $"{_fragmentMode}")),
+        };
+    }
+
+    public DownloadEnumerable<OutType> Build() {
+        var context = _ctxBuilder.Build();
+        var enumerable = new DownloadEnumerable<OutType>(ConstructDownloader(context));
+        return enumerable;
+    }
+}

Beam.Fluent/Core/FragmentMode.cs

@@ -0,0 +1,17 @@
+namespace Beam.Fluent;
+
+public enum FragmentMode {
+    Single,
+    Fragmented
+}
+
+public enum Channel {
+    Plain,
+    Stealth,
+    Playwright
+}
+
+public enum ContentKind {
+    File,
+    Binary
+}

Beam.Fluent/Core/IContextStage.cs

@@ -0,0 +1,20 @@
+using Beam.Abstractions;
+using Beam.Downloaders;
+using Beam.Models;
+using Beam.Playwright;
+using Beam.Stealth;
+
+namespace Beam.Fluent;
+
+public interface IContextStage<OutType> {
+    IContextStage<OutType> Configure(Action<DownloadContextBuilder> configure);
+    IContextStage<OutType> WithParallelism(int degree);
+    IContextStage<OutType> WithTimeout(TimeSpan timeout);
+    IContextStage<OutType> WithRetryReporter(IProgress<IRetryReport> reporter);
+    IContextStage<OutType> UseFragments();
+    IContextStage<OutType> UsePlaywright(PlaywrightAsyncManipulator manipulator);
+    IContextStage<OutType> UseStealth(StealthAsyncManipulator manipulator, StealthConfig config);
+    IContextStage<OutType> ConfigureUnitDownloaderOptions(
+        Action<UnitDownloaderOptionsBuilder<OutType>> configure);
+    DownloadEnumerable<OutType> Build();
+}

Beam.Fluent/Core/IDownloadStage.cs

@@ -0,0 +1,12 @@
+using System.Collections.Concurrent;
+
+namespace Beam.Fluent;
+
+public interface IDownloadStage<OutType> {
+    IDownloadStage<OutType> SaveToDirectory(string dir);
+    IDownloadStage<OutType> SaveToFiles(IEnumerable<string> files);
+    IDownloadStage<OutType> SaveToMemory(ConcurrentBag<OutType> bag);
+    void WaitForDownload();
+    Task WaitForDownloadAsync();
+    DownloadEnumerable<OutType> AsAsyncEnumerable();
+}

Beam.Fluent/Core/ITransformStage.cs

@@ -0,0 +1,8 @@
+using Beam.Dynamic;
+using Beam.Models;
+
+namespace Beam.Fluent;
+
+public interface ITransformStage<OutType> {
+    IContextStage<OutType> WithTransformer(AsyncTransformer<ByteDocument, OutType> factory);
+}

Beam.Fluent/DownloadBuilder.ContextStage.cs

@@ -1,186 +0,0 @@
-using HtmlAgilityPack;
-using Beam.Playwright;
-using Beam.Stealth;
-
-namespace Beam.Fluent {
-public static partial class DownloadBuilder<RawType, OutType> {
-        private sealed class ContextStage : IContextStage {
-            private readonly DownloadContextBuilder<RawType> _ctxBuilder;
-            private readonly AsyncTransformer<RawType, OutType> _transformer;
-            private int _parallelism = 4;
-            private bool _useFragments = false;
-            private PlaywrightAsyncManipulator? _usePlaywrightManipulator = null;
-            private StealthAsyncManipulator? _useStealthManipulator = null;
-            private StealthConfig? _stealthConfig = null;
-
-            public ContextStage(DownloadContextBuilder<RawType> ctxBuilder, AsyncTransformer<RawType, OutType> transformer) {
-                _ctxBuilder = ctxBuilder;
-                _transformer = transformer;
-            }
-
-            public IContextStage Configure(Action<DownloadContextBuilder<RawType>> configure) {
-                configure(_ctxBuilder);
-                return this;
-            }
-
-            public IContextStage WithParallelism(int degree) {
-                _parallelism = Math.Max(1, degree);
-                return this;
-            }
-
-            public IContextStage WithTimeout(TimeSpan timeout) {
-                _ctxBuilder.WithTimeOut(timeout);
-                return this;
-            }
-
-            public IContextStage WithRetryReporter(IProgress<RetryReport> reporter) {
-                _ctxBuilder.WithRetryReporter(reporter);
-                return this;
-            }
-
-            /// <summary>
-            /// Uses fragments to download multiple links in parallel. This strategy is mutually exclusive with <see cref="UsePlaywright(PlaywrightAsyncManipulator)"/>
-            /// </summary>
-            /// <returns></returns>
-            public IContextStage UseFragments() {
-                if (_usePlaywrightManipulator is not null)
-                    _usePlaywrightManipulator = null;
-
-                _useFragments = true;
-                return this;
-            }
-
-            /// <summary>
-            /// Use a puppet browser to download the links. This strategy is mutually exclusive with <see cref="UseFragments"/>
-            /// </summary>
-            /// <param name="manipulator">The page manipulator</param>
-            /// <returns></returns>
-            public IContextStage UsePlaywright(PlaywrightAsyncManipulator manipulator) {
-                if (_useFragments)
-                    _useFragments = false;
-                if (_useStealthManipulator is not null)
-                    _useStealthManipulator = null;
-
-                _usePlaywrightManipulator = manipulator;
-                return this;
-            }
-
-            public IContextStage UseStealth(StealthAsyncManipulator manipulator, StealthConfig config) {
-                if (_usePlaywrightManipulator is not null)
-                    _usePlaywrightManipulator = null;
-
-                _useStealthManipulator = manipulator;
-                _stealthConfig = config;
-                return this;
-            }
-
-            private object ConstructUnitDownloader(DownloadContext<RawType> context) {
-                return (_useFragments, _useStealthManipulator, _usePlaywrightManipulator, _transformer, context.AsyncFailurePredicates) switch {
-                    // ────────────────  fragmented HTML  ────────────────
-                    (true, null, _, AsyncTransformer<HtmlDocument, OutType> asyncHtmlTransformer,
-                    AsyncDownloadFailurePredicate<HtmlDocument>[] documentFailurePredicates)
-                        => new UnitFragmentDownloader<OutType>(
-                            context.Web,
-                            asyncHtmlTransformer,
-                            documentFailurePredicates,
-                            _parallelism,
-                            context.DownloadLogger),
-                    // ────────────────  fragmented binary  ────────────────
-                    (true, null, _, AsyncTransformer<ByteDocument, OutType> asyncBinaryTransformer,
-                    AsyncDownloadFailurePredicate<ByteDocument>[] responseFailurePredicates)
-                        => new UnitFragmentDownloaderBinary<OutType>(
-                            context.Client,
-                            asyncBinaryTransformer,
-                            responseFailurePredicates,
-                            _parallelism,
-                            context.DownloadLogger),
-                    // ────────────────  single HTML  ────────────────
-                    (false, null, null, AsyncTransformer<HtmlDocument, OutType> asyncHtmlTransformer,
-                    AsyncDownloadFailurePredicate<HtmlDocument>[] documentFailurePredicates)
-                        => new UnitDownloader<OutType>(
-                            context.Web,
-                            asyncHtmlTransformer,
-                            documentFailurePredicates),
-                    // ────────────────  single binary  ────────────────
-                    (false, null, null, AsyncTransformer<ByteDocument, OutType> asyncBinaryTransformer,
-                    AsyncDownloadFailurePredicate<ByteDocument>[] responseFailurePredicates)
-                        => new UnitDownloaderBinary<OutType>(
-                            context.Client,
-                            asyncBinaryTransformer,
-                            responseFailurePredicates),
-                    // ────────────────  single playwright binary  ────────────────
-                    (false, _, PlaywrightAsyncManipulator manipulator, AsyncTransformer<ByteDocument, OutType> asyncBinaryTransformer,
-                    AsyncDownloadFailurePredicate<ByteDocument>[] responseFailurePredicates)
-                        => new PlaywrightUnitDownloader<OutType>(
-                            context.Client,
-                            manipulator,
-                            asyncBinaryTransformer,
-                            responseFailurePredicates),
-                    // ────────────────  single playwrigt HTML  ────────────────
-                    (false, _, PlaywrightAsyncManipulator manipulator, AsyncTransformer<HtmlDocument, OutType> asyncHtmlTransformer,
-                    AsyncDownloadFailurePredicate<HtmlDocument>[] documentFailurePredicates)
-                        => new PlaywrightUnitPageDownloader<OutType>(
-                            context.Web,
-                            manipulator,
-                            asyncHtmlTransformer,
-                            documentFailurePredicates),
-                    // ────────────────  single stealth HTML  ────────────────
-                    (false, StealthAsyncManipulator manipulator, _, AsyncTransformer<HtmlDocument, OutType> asyncHtmlTransformer,
-                    AsyncDownloadFailurePredicate<HtmlDocument>[] documentFailurePredicates)
-                        => new StealthUnitPageDownloader<OutType>(
-                            context.Web,
-                            _stealthConfig ?? throw new Exception($"Stealth config is null"),
-                            manipulator,
-                            asyncHtmlTransformer,
-                            documentFailurePredicates),
-                    // ────────────────  single stealth binary  ────────────────
-                    (false, StealthAsyncManipulator manipulator, _, AsyncTransformer<ByteDocument, OutType> asyncBinaryTransformer,
-                    AsyncDownloadFailurePredicate<ByteDocument>[] responseFailurePredicates)
-                        => new StealthUnitDownloader<OutType>(
-                            context.Client,
-                            _stealthConfig ?? throw new Exception($"Stealth config is null"),
-                            manipulator,
-                            asyncBinaryTransformer,
-                            responseFailurePredicates),
-                    // ────────────────  fragment stealth HTML  ────────────────
-                    (true, StealthAsyncManipulator manipulator, _, AsyncTransformer<HtmlDocument, OutType> asyncHtmlTransformer,
-                    AsyncDownloadFailurePredicate<HtmlDocument>[] downloadFailurePredicates)
-                        => new StealthFragmentPageDownloader<OutType>(
-                            context.Web,
-                            _stealthConfig ?? throw new Exception($"Stealth config is null"),
-                            manipulator,
-                            asyncHtmlTransformer),
-                    // ────────────────  fragment stealth binary  ────────────────
-                    (true, StealthAsyncManipulator manipulator, _, AsyncTransformer<ByteDocument, OutType> asyncBinaryTransformer,
-                    AsyncDownloadFailurePredicate<ByteDocument>[] responseFailurePredicates)
-                        => new StealthFragmentDownloader<OutType>(
-                            context.Client,
-                            _stealthConfig ?? throw new Exception($"Stealth config is null"),
-                            manipulator,
-                            asyncBinaryTransformer),
-                    _ => throw new Exception($"Unsupported transformer / failure-predicate combinatAsyion. Missing pattern: {_useFragments} , {_transformer.GetType().AsUniqueName()} , {context.AsyncFailurePredicates?.GetType().AsUniqueName()}"),
-                };
-            }
-
-            private IAsyncEnumerator<Ordered<OutType>> ConstructDownloader(DownloadContext<RawType> context) {
-                var copyOfContext = context.CreateBuilder().Build();
-                return _useFragments switch {
-                    true => new SequentialFragmentDownloader<RawType, OutType>(
-                        copyOfContext,
-                        ctx => (IUnitDownloader<Fragment<Ordered<OutType>>>)ConstructUnitDownloader(ctx),
-                        context.DownloadLogger).UnwrapFragmented(),
-                    false => new SequentialDownloader<RawType, OutType>(
-                        copyOfContext,
-                        ctx => (IUnitDownloader<OutType>)ConstructUnitDownloader(ctx),
-                        context.DownloadLogger).WrapOrdered()
-                };
-            }
-
-            public DownloadEnumerable<OutType> Build() {
-                var context = _ctxBuilder.Build();
-                var enumerable = new DownloadEnumerable<OutType>(ConstructDownloader(context));
-                return enumerable;
-            }
-        }
-    }
-}

Beam.Fluent/DownloadBuilder.DownloadStage.cs

@@ -1,43 +0,0 @@
-using System.Collections.Concurrent;
-using System.Text.Json;
-
-namespace Beam.Fluent {
-public static partial class DownloadBuilder<RawType, OutType> {
-        private sealed class DownloadStage(DownloadEnumerable<OutType> download) : IDownloadStage {
-            private IAsyncEnumerable<Ordered<OutType>> _download = download;
-
-            public DownloadEnumerable<OutType> AsAsyncEnumerable() {
-                return new DownloadEnumerable<OutType>(_download.GetAsyncEnumerator());
-            }
-
-            private async IAsyncEnumerable<Ordered<OutType>> _SaveToDirectory(string dir) {
-                Directory.CreateDirectory(dir);
-                await foreach(var download in _download) {
-                    await System.IO.File.WriteAllTextAsync(Path.Combine(dir, $"{Path.GetRandomFileName()}.{download.Order}.json"), JsonSerializer.Serialize(dir));
-                    yield return download;
-                }
-            }
-
-            public IDownloadStage SaveToDirectory(string dir) {
-                _download = _SaveToDirectory(dir);
-                return this;
-            }
-
-            public IDownloadStage SaveToFiles(IEnumerable<string> files) {
-                throw new NotImplementedException();
-            }
-
-            public IDownloadStage SaveToMemory(ConcurrentBag<OutType> bag) {
-                throw new NotImplementedException();
-            }
-
-            public void WaitForDownload() {
-                throw new NotImplementedException();
-            }
-
-            public Task WaitForDownloadAsync() {
-                throw new NotImplementedException();
-            }
-        }
-    }
-}

Beam.Fluent/DownloadBuilder.IAlternativeLinkStage.cs

@@ -1,7 +0,0 @@
-namespace Beam.Fluent {
-public static partial class DownloadBuilder<RawType, OutType> {
-        public interface IAlternativeLinkStage {
-            IAlternativeTransformStage WithLinks(IEnumerable<SourceLink> links);
-        }
-    }
-}

Beam.Fluent/DownloadBuilder.IAlternativeTransformStage.cs

@@ -1,10 +0,0 @@
-namespace Beam.Fluent {
-public static partial class DownloadBuilder<RawType, OutType> {
-        public interface IAlternativeTransformStage {
-            IContextStage WithTransformer(AsyncTransformer<RawType, OutType> transformer);
-            IContextStage WithTransformer(Func<RawType, OutType> transformer) {
-                return WithTransformer(rt => Task.FromResult(transformer(rt)));
-            }
-        }
-    }
-}