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src/Sdk/DTObjectTemplating/ObjectTemplating/Schema/Definition.cs

@@ -0,0 +1,49 @@
+using System;
+using System.Linq;
+using GitHub.DistributedTask.ObjectTemplating.Tokens;
+
+namespace GitHub.DistributedTask.ObjectTemplating.Schema
+{
+    /// <summary>
+    /// Defines the allowable schema for a user defined type
+    /// </summary>
+    internal abstract class Definition
+    {
+        protected Definition()
+        {
+        }
+
+        protected Definition(MappingToken definition)
+        {
+            for (var i = 0; i < definition.Count; )
+            {
+                var definitionKey = definition[i].Key.AssertString($"{TemplateConstants.Definition} key");
+                if (String.Equals(definitionKey.Value, TemplateConstants.Context, StringComparison.Ordinal))
+                {
+                    var context = definition[i].Value.AssertSequence($"{TemplateConstants.Context}");
+                    definition.RemoveAt(i);
+                    Context = context
+                        .Select(x => x.AssertString($"{TemplateConstants.Context} item").Value)
+                        .Distinct()
+                        .ToArray();
+                }
+                else if (String.Equals(definitionKey.Value, TemplateConstants.Description, StringComparison.Ordinal))
+                {
+                    definition.RemoveAt(i);
+                }
+                else
+                {
+                    i++;
+                }
+            }
+        }
+
+        internal abstract DefinitionType DefinitionType { get; }
+
+        internal String[] Context { get; private set; } = new String[0];
+
+        internal abstract void Validate(
+            TemplateSchema schema,
+            String name);
+    }
+}