Attempt to expose a functions metadata

Source/Expressive/Context.cs

@@ -50,6 +50,16 @@ public class Context
 
         internal char DecimalSeparator { get; }
 
+        /// <summary>
+        /// Gets the currently registered functions described by <see cref="IFunctionMetadata"/>.
+        /// </summary>
+        public IEnumerable<IFunctionMetadata> RegisteredFunctions => this.registeredFunctions.Values.OfType<IFunctionMetadata>();
+
+        /// <summary>
+        /// Gets the currently registered operators described by <see cref="IOperatorMetadata"/>.
+        /// </summary>
+        public IEnumerable<IOperatorMetadata> RegisteredOperators => this.registeredFunctions.Values.OfType<IOperatorMetadata>();
+
         internal IEnumerable<string> FunctionNames => this.registeredFunctions.Keys.OrderByDescending(k => k.Length);
 
         internal IEnumerable<string> OperatorNames => this.registeredOperators.Keys.OrderByDescending(k => k.Length);

Source/Expressive/Expression.cs

@@ -59,6 +59,16 @@ public IReadOnlyCollection<string> ReferencedVariables
             }
         }
 
+        /// <summary>
+        /// Gets the currently registered functions described by <see cref="IFunctionMetadata"/>.
+        /// </summary>
+        public IEnumerable<IFunctionMetadata> RegisteredFunctions => this.context.RegisteredFunctions;
+
+        /// <summary>
+        /// Gets the currently registered operators described by <see cref="IOperatorMetadata"/>.
+        /// </summary>
+        public IEnumerable<IOperatorMetadata> RegisteredOperators => this.context.RegisteredOperators;
+
         #endregion
 
         #region Constructors

Source/Expressive/Functions/IFunction.cs

@@ -6,7 +6,7 @@ namespace Expressive.Functions
     /// <summary>
     /// Interface definition for a Function that can be evaluated.
     /// </summary>
-    public interface IFunction
+    public interface IFunction : IFunctionMetadata
     {
         /// <summary>
         /// Gets or sets the Variables and their values to be used in evaluating an <see cref="Expression"/>.
@@ -15,11 +15,6 @@ public interface IFunction
         IDictionary<string, object> Variables { get; set; }
 #pragma warning restore CA2227 // Collection properties should be read only
 
-        /// <summary>
-        /// Gets the name of the Function.
-        /// </summary>
-        string Name { get; }
-
         /// <summary>
         /// Forces the Function to evaluate itself using the supplied parameters.
         /// </summary>

Source/Expressive/Functions/IFunctionMetadata.cs

@@ -0,0 +1,13 @@
+namespace Expressive.Functions
+{
+    /// <summary>
+    /// Interface definition for an <see cref="IFunction"/>s metadata.
+    /// </summary>
+    public interface IFunctionMetadata
+    {
+        /// <summary>
+        /// Gets the name of the Function.
+        /// </summary>
+        string Name { get; }
+    }
+}

Source/Expressive/Operators/IOperator.cs

@@ -6,13 +6,8 @@ namespace Expressive.Operators
     /// <summary>
     /// Definition for all Operators (i.e. +, -, etc.) that are available in Expressive.
     /// </summary>
-    public interface IOperator
+    public interface IOperator : IOperatorMetadata
     {
-        /// <summary>
-        /// Gets the list of tags that can be used to identify this IOperator.
-        /// </summary>
-        IEnumerable<string> Tags { get; }
-
         /// <summary>
         /// Builds the operator in to an <see cref="IExpression"/> ready for evaluation.
         /// </summary>

Source/Expressive/Operators/IOperatorMetadata.cs

@@ -0,0 +1,15 @@
+using System.Collections.Generic;
+
+namespace Expressive.Operators
+{
+    /// <summary>
+    /// Interface definition for an <see cref="IOperator"/>s metadata.
+    /// </summary>
+    public interface IOperatorMetadata
+    {
+        /// <summary>
+        /// Gets the list of tags that can be used to identify this IOperator.
+        /// </summary>
+        IEnumerable<string> Tags { get; }
+    }
+}