Merge pull request #4 from StuffOfInterest/feature-for

Feature for

LogicTagHelpers.Demo/Controllers/HomeController.cs

@@ -28,5 +28,10 @@ public IActionResult TestWhile()
 		{
 			return View();
 		}
+
+		public IActionResult TestFor()
+		{
+			return View();
+		}
 	}
 }

LogicTagHelpers.Demo/Views/Home/Index.cshtml

@@ -7,4 +7,5 @@
 	<li><a asp-action="TestSwitch">Test Switch</a></li>
 	<li><a asp-action="TestForeach">Test Foreach</a></li>
 	<li><a asp-action="TestWhile">Test While</a></li>
+	<li><a asp-action="TestFor">Test For</a></li>
 </ul>

LogicTagHelpers.Demo/Views/Home/TestFor.cshtml

@@ -0,0 +1,6 @@
+<h2>Test 1</h2>
+
+@{ int x = default; }
+<for initialize="() => x = 0" condition="() => x < 10" update="() => x++">
+	<p>Should display @x.</p>
+</for>

LogicTagHelpers/ForTagHelper.cs

@@ -0,0 +1,44 @@
+using System;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Razor.TagHelpers;
+
+namespace LogicTagHelpers
+{
+	/// <summary>
+	/// For loop rendering block of code as long as condition is met.
+	/// </summary>
+	public class ForTagHelper : TagHelper
+	{
+		/// <summary>
+		/// Initialize variable for loop control.
+		/// </summary>
+		public Action Initialize { get; set; }
+
+		/// <summary>
+		/// Function to evaluate exit condition.
+		/// Inner content will render as long as the condition returns true.
+		/// </summary>
+		public Func<bool> Condition { get; set; }
+
+		/// <summary>
+		/// Update to perform at end of each pass through the loop.
+		/// </summary>
+		public Action Update { get; set; }
+
+		public override async Task ProcessAsync(TagHelperContext context, TagHelperOutput output)
+		{
+			Initialize?.Invoke();
+
+			output.TagName = null;
+			output.Content.Clear();
+
+			while (Condition?.Invoke() ?? true)
+			{
+				var childContent = await output.GetChildContentAsync(false);
+				output.Content.AppendHtml(childContent);
+
+				Update?.Invoke();
+			}
+		}
+	}
+}

LogicTagHelpers/LogicTagHelpers.csproj

@@ -3,7 +3,7 @@
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
-    <Version>0.4.0</Version>
+    <Version>0.5.0</Version>
     <Authors>Delbert Matlock</Authors>
     <Company>Stuff Of Interest</Company>
     <Product />
@@ -14,9 +14,9 @@ Done:
 * switch/case/default
 * foreach
 * while
+* for
 
 Future:
-* for
 * do</Description>
     <PackageProjectUrl>https://github.com/StuffOfInterest/LogicTagHelpers</PackageProjectUrl>
     <RepositoryUrl>https://github.com/StuffOfInterest/LogicTagHelpers</RepositoryUrl>

README.md

@@ -13,10 +13,10 @@
   * case
 * [foreach](#foreach)
 * [while](#while)
+* [for](#for)
 
 ## Future Tags
 
-* for
 * do
 
 ## Installation
@@ -56,7 +56,7 @@ Following line must be added to the `_ViewImports.cshtml` file for the logic tag
 
 ### foreach
 
-```cshtml
+```html
 @{ var context = new ForeachContext<(type)>((values-of-type)); }
 <foreach iterator="context">
    (content to display for each item in collection)
@@ -65,10 +65,18 @@ Following line must be added to the `_ViewImports.cshtml` file for the logic tag
 
 ### while
 
-```cshtml
+```html
 @{ var x = 0; }
 <while condition="() => x < 10">
-	(content to display while condition is true)
-	@{ x++; }
+   (content to display while condition is true)
+   @{ x++; }
 </while>
+```
+
+### for
+```html
+@{ int x = default; }
+<for initialize="() => x = 0" condition="() => x < 10" update="() => x++">
+   (content to display while condition is true)
+</for>
 ```