Prevent outputting invalid key names

Now key names are escaped if they begin with a number or contain an invalid
character, so they shouldn't cause a parse error on the CoffeeTranslation
end.

Signed-off-by: Isabella <[email protected]>

Program.cs

@@ -181,7 +181,7 @@ internal static void WriteCoffeeTranslationFileFromCldrXml(XDocument cldr)
             string content = (node.FirstNode as XText).Value;
             string formattedContent = FormatStringLiteral(content);
 
-            langFileWriter.WriteLine($"{languageName}: {formattedContent}");
+            langFileWriter.WriteLine($"{EscapeKeyName(languageName)}: {formattedContent}");
         }
 
         string langFileContents = langFileWriter.ToString();
@@ -219,7 +219,7 @@ internal static void WriteCoffeeTranslationFileFromCldrXml(XDocument cldr)
 
             string formattedContent = FormatStringLiteral(content);
 
-            countryFileWriter.WriteLine($"{countryName}: {formattedContent}");
+            countryFileWriter.WriteLine($"{EscapeKeyName(countryName)}: {formattedContent}");
         }
 
         string countryFileContents = countryFileWriter.ToString();
@@ -233,6 +233,20 @@ internal static void WriteFileHeaderComment(StringWriter writer)
         writer.WriteLine();
     }
 
+    internal static string EscapeKeyName(string keyName)
+    {
+        string result = string.Empty;
+
+        if (char.IsDigit(keyName[0]))
+        {
+            result += "_";
+        }
+
+        result += keyName.Replace("-", "_");
+
+        return result;
+    }
+
     internal static string FormatStringLiteral(string srcValue)
     {
         srcValue = srcValue.Replace("\\", "\\\\");