Added missing Generator file.

src/Generator/Generator.cs

@@ -0,0 +1,107 @@
+using System;
+using System.Collections.Generic;
+using CppSharp.AST;
+
+namespace CppSharp.Generators
+{
+    /// <summary>
+    /// Kinds of language generators.
+    /// </summary>
+    public enum GeneratorKind
+    {
+        CLI,
+        CSharp,
+    }
+
+    /// <summary>
+    /// Output generated by each backend generator.
+    /// </summary>
+    public struct GeneratorOutput
+    {
+        /// <summary>
+        /// Translation unit associated with output.
+        /// </summary>
+        public TranslationUnit TranslationUnit;
+
+        /// <summary>
+        /// Text templates with generated output.
+        /// </summary>
+        public List<Template> Templates;
+    }
+
+    /// <summary>
+    /// Generators are the base class for each language backend.
+    /// </summary>
+    public abstract class Generator
+    {
+        public Driver Driver { get; private set; }
+
+        protected Generator(Driver driver)
+        {
+            Driver = driver;
+        }
+
+        /// <summary>
+        /// Called when a translation unit is generated.
+        /// </summary>
+        public Action<GeneratorOutput> OnUnitGenerated = delegate { };
+
+        /// <summary>
+        /// Setup any generator-specific passes here.
+        /// </summary>
+        public abstract bool SetupPasses();
+
+        /// <summary>
+        /// Setup any generator-specific processing here.
+        /// </summary>
+        public virtual void Process()
+        {
+
+        }
+
+        /// <summary>
+        /// Generates the outputs.
+        /// </summary>
+        public virtual List<GeneratorOutput> Generate()
+        {
+            var outputs = new List<GeneratorOutput>();
+
+            foreach (var unit in Driver.ASTContext.TranslationUnits)
+            {
+                if (unit.Ignore || !unit.HasDeclarations)
+                    continue;
+
+                if (unit.IsSystemHeader)
+                    continue;
+
+                var templates = Generate(unit);
+                if (templates.Count == 0)
+                    continue;
+
+                foreach (var template in templates)
+                    template.Process();
+
+                var output = new GeneratorOutput
+                    {
+                        TranslationUnit = unit,
+                        Templates = templates
+                    };
+                outputs.Add(output);
+
+                OnUnitGenerated(output);
+            }
+
+            return outputs;
+        }
+
+        /// <summary>
+        /// Generates the outputs for a given translation unit.
+        /// </summary>
+        public abstract List<Template> Generate(TranslationUnit unit);
+
+        public static string GeneratedIdentifier(string id)
+        {
+            return "__" + id;
+        }
+    }
+}