From 166b8ae8aed037ec395f799cc080a5ba75167ea7 Mon Sep 17 00:00:00 2001
From: Michael Mairegger <michael.mairegger@yahoo.de>
Date: Tue, 9 Apr 2019 08:18:55 +0200
Subject: [PATCH] Show non valid latin code characters when LatinValidator
 fails.

---
 Validators/LatinValidators.cs | 36 ++++++++++++++++++++++++++++++++---
 1 file changed, 33 insertions(+), 3 deletions(-)

diff --git a/Validators/LatinValidators.cs b/Validators/LatinValidators.cs
index a6846d2e..27aa6647 100644
--- a/Validators/LatinValidators.cs
+++ b/Validators/LatinValidators.cs
@@ -1,4 +1,6 @@
-using System.Text.RegularExpressions;
+using System;
+using System.Text;
+using System.Text.RegularExpressions;
 using FluentValidation;
 using FluentValidation.Validators;
 
@@ -8,9 +10,8 @@ public abstract class LatinBaseValidator<T> : PropertyValidator
     {
         private readonly Charsets _charset;
 
-
         public LatinBaseValidator(Charsets charset)
-            : base($"Testo contenente caratteri non validi ({(charset == Charsets.BasicLatin ? "Unicode Basic Latin" : "Unicode Latin-1 Supplement")})")
+            : base($"Testo contenente caratteri non validi ({(charset == Charsets.BasicLatin ? "Unicode Basic Latin" : "Unicode Latin-1 Supplement")}). valori non accettati: {{NonLatinCode}}")
         {
             _charset = charset;
         }
@@ -30,6 +31,35 @@ protected override bool IsValid(PropertyValidatorContext context)
             }
             return Regex.Match(context.PropertyValue.ToString(), challenge).Success;
         }
+
+        protected override void PrepareMessageFormatterForValidationError(PropertyValidatorContext context)
+        {
+            base.PrepareMessageFormatterForValidationError(context);
+
+            var sb = new StringBuilder();
+            foreach (var c in context.PropertyValue.ToString())
+            {
+                int upperLimit;
+                switch (_charset)
+                {
+                    case Charsets.BasicLatin:
+                        upperLimit = 0x7F;
+                        break;
+                    case Charsets.Latin1Supplement:
+                        upperLimit = 0xFF;
+                        break;
+                    default:
+                        throw new ArgumentOutOfRangeException();
+                }
+
+                if (c > upperLimit)
+                {
+                    sb.Append(c);
+                }
+            }
+
+            context.MessageFormatter.AppendArgument("NonLatinCode", sb.ToString());
+        }
     }
 
     public class BasicLatinValidator<T> : LatinBaseValidator<T>