Humanize multi line code tag (#3239)

Trim text at the end and add newline if text containing `<code>\r\n` and/or `\r\n</code>` combinations.

Author: EvgeniyZ

src/Swashbuckle.AspNetCore.SwaggerGen/XmlComments/XmlCommentsTextHelper.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Linq;
 using System.Net;
+using System.Text;
 using System.Text.RegularExpressions;
 
 namespace Swashbuckle.AspNetCore.SwaggerGen
@@ -10,7 +11,7 @@ public static partial class XmlCommentsTextHelper
         public static string Humanize(string text)
         {
             if (text == null)
-                throw new ArgumentNullException("text");
+                throw new ArgumentNullException(nameof(text));
 
             //Call DecodeXml at last to avoid entities like &lt and &gt to break valid xml
 
@@ -101,7 +102,24 @@ private static string HumanizeCodeTags(this string text)
 
         private static string HumanizeMultilineCodeTags(this string text)
         {
-            return MultilineCodeTag().Replace(text, (match) => "```" + match.Groups["display"].Value + "```");
+            return MultilineCodeTag().Replace(text, match =>
+            {
+                var codeText = match.Groups["display"].Value;
+                if (LineBreaks().IsMatch(codeText))
+                {
+                    var builder = new StringBuilder().Append("```");
+                    if (!codeText.StartsWith("\r") && !codeText.StartsWith("\n"))
+                    {
+                        builder.AppendLine();
+                    }
+
+                    return builder.AppendLine(codeText.TrimEnd())
+                        .Append("```")
+                        .ToString();
+                }
+
+                return $"```{codeText}```";
+            });
         }
 
         private static string HumanizeParaTags(this string text)

test/Swashbuckle.AspNetCore.IntegrationTests/SwaggerVerifyIntegrationTest.SwaggerEndpoint_ReturnsValidSwaggerJson_DotNet6_startupType=Basic.Startup_swaggerRequestUri=v1.verified.txt

@@ -87,6 +87,31 @@
         "x-purpose": "test"
       }
     },
+    "/products/all": {
+      "get": {
+        "tags": [
+          "CrudActions"
+        ],
+        "summary": "Get all products",
+        "description": "```\r\n            {\r\n              \"Id\":1,\r\n              \"Description\":\"\",\r\n              \"Status\": 0,\r\n              \"Status2\": 1\r\n            }\r\n```",
+        "responses": {
+          "200": {
+            "description": "OK",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "array",
+                  "items": {
+                    "$ref": "#/components/schemas/Product"
+                  }
+                }
+              }
+            }
+          }
+        },
+        "x-purpose": "test"
+      }
+    },
     "/products/{id}": {
       "get": {
         "tags": [

test/Swashbuckle.AspNetCore.IntegrationTests/SwaggerVerifyIntegrationTest.SwaggerEndpoint_ReturnsValidSwaggerJson_startupType=Basic.Startup_swaggerRequestUri=v1.verified.txt

@@ -87,6 +87,31 @@
         "x-purpose": "test"
       }
     },
+    "/products/all": {
+      "get": {
+        "tags": [
+          "CrudActions"
+        ],
+        "summary": "Get all products",
+        "description": "```\r\n            {\r\n              \"Id\":1,\r\n              \"Description\":\"\",\r\n              \"Status\": 0,\r\n              \"Status2\": 1\r\n            }\r\n```",
+        "responses": {
+          "200": {
+            "description": "OK",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "array",
+                  "items": {
+                    "$ref": "#/components/schemas/Product"
+                  }
+                }
+              }
+            }
+          }
+        },
+        "x-purpose": "test"
+      }
+    },
     "/products/{id}": {
       "get": {
         "tags": [

test/Swashbuckle.AspNetCore.SwaggerGen.Test/XmlComments/XmlCommentsTextHelperTests.cs

@@ -158,5 +158,54 @@ This is a paragraph.
 
             Assert.Equal("\r\nThis is a paragraph. MultiLined.\r\n\r\nThis is a paragraph.", output, false, true);
         }
+
+        [Fact]
+        public void Humanize_CodeMultiLineTag()
+        {
+            const string input = @"
+            <code>
+               {
+                ""Prop1"":1,
+                ""Prop2"":[]
+               }
+            </code>";
+
+            var output = XmlCommentsTextHelper.Humanize(input);
+
+            var expected = string.Join("\r\n",
+            [
+                "```",
+                "   {",
+                "    \"Prop1\":1,",
+                "    \"Prop2\":[]",
+                "   }",
+                "```"
+            ]);
+            Assert.Equal(expected, output, false, true);
+        }
+
+        [Fact]
+        public void Humanize_CodeMultiLineTag_OnSameLine()
+        {
+            const string input = @"
+            <code>{
+                ""Prop1"":1,
+                ""Prop2"":[]
+               }
+            </code>";
+
+            var output = XmlCommentsTextHelper.Humanize(input);
+
+            var expected = string.Join("\r\n",
+            [
+                "```",
+                "{",
+                "    \"Prop1\":1,",
+                "    \"Prop2\":[]",
+                "   }",
+                "```"
+            ]);
+            Assert.Equal(expected, output, false, true);
+        }
     }
 }

test/WebSites/Basic/Controllers/CrudActionsController.cs

@@ -32,6 +32,23 @@ public Product Create([FromBody, Required]Product product)
             return product;
         }
 
+        /// <summary>Get all products</summary>
+        /// <remarks>
+        /// <code>
+        /// {
+        ///   "Id":1,
+        ///   "Description":"",
+        ///   "Status": 0,
+        ///   "Status2": 1
+        /// }
+        /// </code>
+        /// </remarks>
+        [HttpGet("all")]
+        public List<Product> GetAll()
+        {
+            return [];
+        }
+
         /// <summary>
         /// Searches the collection of products by description key words
         /// </summary>