Start adding enum helpers

SabreTools.Core/MappingAttribute.cs

@@ -0,0 +1,24 @@
+using System;
+
+namespace SabreTools.Core
+{
+    /// <summary>
+    /// Maps a set of strings to an enum value
+    /// </summary>
+    [AttributeUsage(AttributeTargets.Field, AllowMultiple = false)]
+    public class MappingAttribute : Attribute
+    {
+        /// <summary>
+        /// Set of mapping strings
+        /// </summary>
+        public string[] Mappings { get; private set; }
+
+        /// <summary>
+        /// Constructor
+        /// </summary>
+        public MappingAttribute(params string[] mappings)
+        {
+            this.Mappings = mappings;
+        }
+    }
+}

SabreTools.Core/Tools/AttributeHelper.cs

@@ -0,0 +1,48 @@
+using System;
+using System.Linq;
+
+namespace SabreTools.Core.Tools
+{
+    public static class AttributeHelper<T>
+    {
+        /// <summary>
+        /// Get the MappingAttribute from a supported value
+        /// </summary>
+        /// <param name="value">Value to use</param>
+        /// <returns>MappingAttribute attached to the value</returns>
+        public static MappingAttribute GetAttribute(T value)
+        {
+            // Null value in, null value out
+            if (value == null)
+                return null;
+
+            // Current enumeration type
+            var enumType = typeof(T);
+            if (Nullable.GetUnderlyingType(enumType) != null)
+                enumType = Nullable.GetUnderlyingType(enumType);
+
+            // If the value returns a null on ToString, just return null
+            string valueStr = value.ToString();
+            if (string.IsNullOrWhiteSpace(valueStr))
+                return null;
+            
+            // Get the member info array
+            var memberInfos = enumType?.GetMember(valueStr);
+            if (memberInfos == null)
+                return null;
+
+            // Get the enum value info from the array, if possible
+            var enumValueMemberInfo = memberInfos.FirstOrDefault(m => m.DeclaringType == enumType);
+            if (enumValueMemberInfo == null)
+                return null;
+            
+            // Try to get the relevant attribute
+            var attributes = enumValueMemberInfo.GetCustomAttributes(typeof(MappingAttribute), true);
+            if (attributes == null)
+                return null;
+            
+            // Return the first attribute, if possible
+            return (MappingAttribute)attributes.FirstOrDefault();
+        }
+    }
+}

SabreTools.Core/Tools/Converters.cs

@@ -1,4 +1,6 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
+using System.Linq;
 using System.Text.RegularExpressions;
 
 namespace SabreTools.Core.Tools
@@ -1341,6 +1343,44 @@ namespace SabreTools.Core.Tools
             };
         }
         
+        /// <summary>
+        /// Get a set of mappings from strings to enum values
+        /// </summary>
+        /// <param name="type">Enum type to generate from</param>
+        /// <returns>Dictionary of string to enum values</returns>
+        private static Dictionary<string, T> GenerateToEnum<T>(Type type)
+        {
+            try
+            {
+                // Get all of the values for the enum type
+                var values = Enum.GetValues(type);
+
+                // Build the output dictionary
+                Dictionary<string, T> mappings = new();
+                foreach (T value in values)
+                {
+                    // Try to get the mapping attribute
+                    MappingAttribute attr = AttributeHelper<T>.GetAttribute(value);
+                    if (attr?.Mappings == null || !attr.Mappings.Any())
+                        continue;
+
+                    // Loop through the mappings and add each
+                    foreach (string mapString in attr.Mappings)
+                    {
+                        mappings[mapString] = value;
+                    }
+                }
+
+                // Return the output dictionary
+                return mappings;
+            }
+            catch
+            {
+                // This should not happen, only if the type was not an enum
+                return new Dictionary<string, T>();
+            }
+        }
+
         #endregion
 
         #region Enum to String
@@ -1780,6 +1820,41 @@ namespace SabreTools.Core.Tools
             };
         }
 
+        /// <summary>
+        /// Get a set of mappings from enum values to string
+        /// </summary>
+        /// <param name="type">Enum type to generate from</param>
+        /// <returns>Dictionary of enum to string values</returns>
+        private static Dictionary<T, string> GenerateToString<T>(Type type)
+        {
+            try
+            {
+                // Get all of the values for the enum type
+                var values = Enum.GetValues(type);
+
+                // Build the output dictionary
+                Dictionary<T, string> mappings = new();
+                foreach (T value in values)
+                {
+                    // Try to get the mapping attribute
+                    MappingAttribute attr = AttributeHelper<T>.GetAttribute(value);
+                    if (attr?.Mappings == null || !attr.Mappings.Any())
+                        continue;
+
+                    // Always use the first value in the list
+                    mappings[value] = attr.Mappings[0];
+                }
+
+                // Return the output dictionary
+                return mappings;
+            }
+            catch
+            {
+                // This should not happen, only if the type was not an enum
+                return new Dictionary<T, string>();
+            }
+        }
+
         #endregion
     }
 }