Add IParserProvider interface.

Next up: decouple the existing HTML provider from FeedBuilder

PolyFeed/ParserProviders/IParserProvider.cs

@@ -0,0 +1,26 @@
+using System;
+using System.Net;
+using Microsoft.SyndicationFeed.Atom;
+
+namespace PolyFeed.ParserProviders
+{
+	/// <summary>
+	/// Defines the functionality that a source parser should provide.
+	/// Sources are represented by a <see cref="FeedSource" /> object, and source parsers 
+	/// are responsible for parsing it and populating a given atom feed.
+	/// </summary>
+	public interface IParserProvider
+	{
+		/// <summary>
+		/// Sets the output feed that parsed output should be written to.
+		/// </summary>
+		/// <param name="feed">The output feed writer that output should be written to.</param>
+		void SetOutputFeed(AtomFeedWriter feed);
+		/// <summary>
+		/// Parses a web response that's paired with a given <see cref="FeedSource" />.
+		/// </summary>
+		/// <param name="source">The <see cref="FeedSource"/> object that the <paramref name="response"/> was generated from.</param>
+		/// <param name="response">The <see cref="WebResponse"/> in question needs parsing.</param>
+		void ParseWebResponse(FeedSource source, WebResponse response);
+	}
+}

PolyFeed/PolyFeed.csproj

@@ -152,6 +152,7 @@
     <Compile Include="Helpers\HtmlHelpers.cs" />
     <Compile Include="Helpers\UserAgentHelper.cs" />
     <Compile Include="Helpers\ReflectionHelpers.cs" />
+    <Compile Include="ParserProviders\IParserProvider.cs" />
   </ItemGroup>
   <ItemGroup>
     <None Include="packages.config" />
@@ -159,6 +160,7 @@
   <ItemGroup>
     <Folder Include="Salamander.Core\" />
     <Folder Include="Helpers\" />
+    <Folder Include="ParserProviders\" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <Import Project="..\packages\NETStandard.Library.2.0.3\build\netstandard2.0\NETStandard.Library.targets" Condition="Exists('..\packages\NETStandard.Library.2.0.3\build\netstandard2.0\NETStandard.Library.targets')" />