adding a new event for when definition is requested (#167)

* sending telemetry events for intellisense usage

src/Microsoft.SqlTools.ServiceLayer/LanguageServices/Completion/SqlParserWrapper.cs

@@ -0,0 +1,34 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+using System.Collections.Generic;
+using Microsoft.SqlServer.Management.SqlParser.Intellisense;
+using Microsoft.SqlServer.Management.SqlParser.MetadataProvider;
+using Microsoft.SqlServer.Management.SqlParser.Parser;
+
+namespace Microsoft.SqlTools.ServiceLayer.LanguageServices.Completion
+{
+    /// <summary>
+    /// SqlParserWrapper interface
+    /// </summary>
+    public interface ISqlParserWrapper
+    {
+        IEnumerable<Declaration> FindCompletions(ParseResult parseResult, int line, int col, IMetadataDisplayInfoProvider displayInfoProvider);
+    }
+
+    /// <summary>
+    /// A wrapper class around SQL parser methods to make the operations testable
+    /// </summary>
+    public class SqlParserWrapper : ISqlParserWrapper
+    {
+        /// <summary>
+        /// Creates completion list given SQL script info
+        /// </summary>
+        public IEnumerable<Declaration> FindCompletions(ParseResult parseResult, int line, int col, IMetadataDisplayInfoProvider displayInfoProvider)
+        {
+            return Resolver.FindCompletions(parseResult, line, col, displayInfoProvider);
+        }
+    }
+}