Added a fix for Issue #38

#38

Author: deanhume

.vscode/settings.json

@@ -0,0 +1,3 @@
+{
+    "dotnet.preferCSharpExtension": true
+}

HtmlMinifier.Tests/DataHelpers.cs

@@ -1,10 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace HtmlMinifier.Tests
+namespace HtmlMinifier.Tests
 {
     public static class DataHelpers
     {
@@ -111,5 +105,10 @@ public static class DataHelpers
 
         public static string GithubIssue54 = "<input\r\n  type=\"file\"\r\n  id=\"docpicker\"\r\n  accept=\"application/pdf,image/*\" />";
         public static string GithubIssue54Result = "<input type=\"file\" id=\"docpicker\" accept=\"application/pdf,image/*\" />";
+
+        public static string GithubIssue38 = "<div>\r\n<pre>\r\nTEST\r\nHello\r\nWorld\r\n</pre>\r\n</div>";
+        public static string GithubIssue38Result = "<div> <pre>\r\nTEST\r\nHello\r\nWorld\r\n</pre> </div>";
+
+
     }
 }

HtmlMinifier.Tests/MinificationTests.cs

@@ -199,6 +199,16 @@ public void GithubIssue36_ShouldReturnCorrectly()
             Assert.AreEqual(minifiedHtml, DataHelpers.GithubIssue36Result);
         }
 
+        [TestMethod]
+        public void GithubIssue38_IgnorePreTag_ShouldReturnCorrectly()
+        {
+            // Act
+            string minifiedHtml = StreamReaderExtension.MinifyHtmlCode(DataHelpers.GithubIssue38, noFeatures);
+
+            // Assert
+            Assert.AreEqual(minifiedHtml, DataHelpers.GithubIssue38Result);
+        }
+
         [TestMethod]
         public void RemoveMultipleHtmlComments_WithIncludeVirtuals_ShouldReturnCorrectly()
         {

ViewMinifier/StreamReaderExtension.cs

@@ -145,6 +145,14 @@ public static string MinifyHtml(string htmlContents, Features features)
                 htmlContents = RemoveJavaScriptComments(htmlContents);
             }
 
+            // Extract <pre> contents
+            var preTagContents = new List<string>();
+            htmlContents = Regex.Replace(htmlContents, @"<pre[^>]*>[\s\S]*?<\/pre>", match =>
+            {
+                preTagContents.Add(match.Value);
+                return $"{{{{PRE_TAG_CONTENT_{preTagContents.Count - 1}}}}}";
+            });
+
             // Remove special keys
             htmlContents = htmlContents.Replace("/*", "{{{SLASH_STAR}}}");
 
@@ -168,7 +176,7 @@ public static string MinifyHtml(string htmlContents, Features features)
 
             // Replace spaces between brackets
             htmlContents = Regex.Replace(htmlContents, @"\s*\>\s*\<\s*", "><");
-            
+
             // Replace comments
             if (!features.IgnoreHtmlComments)
             {
@@ -192,6 +200,13 @@ public static string MinifyHtml(string htmlContents, Features features)
 
             // Put back special keys
             htmlContents = htmlContents.Replace("{{{SLASH_STAR}}}", "/*");
+
+            // Restore <pre> contents
+            for (int i = 0; i < preTagContents.Count; i++)
+            {
+                htmlContents = htmlContents.Replace($"{{{{PRE_TAG_CONTENT_{i}}}}}", preTagContents[i]);
+            }
+
             return htmlContents.Trim();
         }