Add Random Regex (using Fare) (#236)

* Xeger

* update example

* 1.0.7

* Fix tests for Handlebars_Xeger

* ReplaceNodeValue

* 1.0.5

* readme

src/WireMock.Net/Transformers/HandleBarsHelpers.cs

@@ -13,6 +13,8 @@ namespace WireMock.Transformers
             HandleBarsLinq.Register(handlebarsContext);
 
             HandleBarsRandom.Register(handlebarsContext);
+
+            HandleBarsXeger.Register(handlebarsContext);
         }
     }
 }

src/WireMock.Net/Transformers/HandleBarsXeger.cs

@@ -0,0 +1,39 @@
+using System;
+using Fare;
+using HandlebarsDotNet;
+using WireMock.Validation;
+
+namespace WireMock.Transformers
+{
+    internal static class HandleBarsXeger
+    {
+        public static void Register(IHandlebars handlebarsContext)
+        {
+            handlebarsContext.RegisterHelper("Xeger", (writer, context, arguments) =>
+            {
+                string value = ParseArgumentAndGenerate(arguments);
+                writer.Write(value);
+            });
+
+            handlebarsContext.RegisterHelper("Xeger", (writer, options, context, arguments) =>
+            {
+                string value = ParseArgumentAndGenerate(arguments);
+                options.Template(writer, value);
+            });
+        }
+
+        private static string ParseArgumentAndGenerate(object[] arguments)
+        {
+            Check.Condition(arguments, args => args.Length == 1, nameof(arguments));
+            Check.NotNull(arguments[0], "arguments[0]");
+
+            switch (arguments[0])
+            {
+                case string pattern:
+                    return new Xeger(pattern).Generate();
+            }
+
+            throw new NotSupportedException($"The value '{arguments[0]}' with type '{arguments[0]?.GetType()}' cannot be used in Handlebars Xeger.");
+        }
+    }
+}

src/WireMock.Net/Transformers/ResponseMessageTransformer.cs

@@ -120,23 +120,34 @@ namespace WireMock.Transformers
                 string transformedString = templateForStringValue(template);
                 if (!string.Equals(stringValue, transformedString))
                 {
-                    JToken value;
-                    try
-                    {
-                        // Try to convert this string into a real JsonObject
-                        value = JToken.Parse(transformedString);
-                    }
-                    catch (JsonException)
-                    {
-                        // Ignore JsonException and just convert to JToken
-                        value = transformedString;
-                    }
-
-                    node.Replace(value);
+                    ReplaceNodeValue(node, transformedString);
                 }
             }
         }
 
+        private static void ReplaceNodeValue(JToken node, string stringValue)
+        {
+            if (bool.TryParse(stringValue, out bool valueAsBoolean))
+            {
+                node.Replace(valueAsBoolean);
+                return;
+            }
+
+            JToken value;
+            try
+            {
+                // Try to convert this string into a JsonObject
+                value = JToken.Parse(stringValue);
+            }
+            catch (JsonException)
+            {
+                // Ignore JsonException and just keep string value and convert to JToken
+                value = stringValue;
+            }
+
+            node.Replace(value);
+        }
+
         private static void TransformBodyAsString(object template, ResponseMessage original, ResponseMessage responseMessage)
         {
             var templateBody = HandlebarsContext.Compile(original.BodyData.BodyAsString);

src/WireMock.Net/WireMock.Net.csproj

@@ -58,7 +58,7 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
     </PackageReference>
     <PackageReference Include="System.Linq.Dynamic.Core" Version="1.0.9" />
-    <PackageReference Include="RandomDataGenerator.Net" Version="1.0.4" />
+    <PackageReference Include="RandomDataGenerator.Net" Version="1.0.7" />
   </ItemGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'net451' ">