Added support for T-SQL parse (#642)

* added support for t-sql parse

* added syntax parse to language service instead

* fixed misleading error

* code review comments

src/Microsoft.SqlTools.ServiceLayer/Agent/AgentService.cs

@@ -702,7 +702,7 @@ namespace Microsoft.SqlTools.ServiceLayer.Agent
                 {
                     if (string.IsNullOrWhiteSpace(stepInfo.JobName))
                     {
-                        return new Tuple<bool, string>(false, "JobId cannot be null");
+                        return new Tuple<bool, string>(false, "JobName cannot be null");
                     }
 
                     JobData jobData;

src/Microsoft.SqlTools.ServiceLayer/LanguageServices/Contracts/SyntaxParse.cs

@@ -0,0 +1,31 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+using Microsoft.SqlTools.Hosting.Protocol.Contracts;
+using Microsoft.SqlTools.ServiceLayer.Workspace.Contracts;
+
+namespace Microsoft.SqlTools.ServiceLayer.LanguageServices.Contracts
+{
+    public class SyntaxParseParams 
+    {
+        public string OwnerUri { get; set; }
+        public string Query { get; set; }
+    }
+    
+    public class SyntaxParseResult
+    {
+        public bool Parseable { get; set; }
+
+        public string[] Errors { get; set; }
+    }
+
+    public class SyntaxParseRequest
+    {
+        public static readonly
+            RequestType<SyntaxParseParams, SyntaxParseResult> Type =
+            RequestType<SyntaxParseParams, SyntaxParseResult>.Create("query/syntaxparse");
+    }
+}
+

src/Microsoft.SqlTools.ServiceLayer/LanguageServices/LanguageService.cs

@@ -243,6 +243,7 @@ namespace Microsoft.SqlTools.ServiceLayer.LanguageServices
             serviceHost.SetRequestHandler(HoverRequest.Type, HandleHoverRequest);
             serviceHost.SetRequestHandler(CompletionRequest.Type, HandleCompletionRequest);
             serviceHost.SetRequestHandler(DefinitionRequest.Type, HandleDefinitionRequest);
+            serviceHost.SetRequestHandler(SyntaxParseRequest.Type, HandleSyntaxParseRequest);
             serviceHost.SetEventHandler(RebuildIntelliSenseNotification.Type, HandleRebuildIntelliSenseNotification);
             serviceHost.SetEventHandler(LanguageFlavorChangeNotification.Type, HandleDidChangeLanguageFlavorNotification);
 
@@ -281,6 +282,42 @@ namespace Microsoft.SqlTools.ServiceLayer.LanguageServices
 
         #region Request Handlers
 
+        /// <summary>
+        /// T-SQL syntax parse request callback
+        /// </summary>
+        /// <param name="param"></param>
+        /// <param name="requestContext"></param>
+        /// <returns></returns>
+        internal async Task HandleSyntaxParseRequest(SyntaxParseParams param, RequestContext<SyntaxParseResult> requestContext)
+        {            
+            await Task.Run(async () => 
+            {
+                try
+                {   
+                    ParseResult result = Parser.Parse(param.Query);
+                    SyntaxParseResult syntaxResult = new SyntaxParseResult();
+                    if (result != null && result.Errors.Count() == 0)
+                    {
+                        syntaxResult.Parseable = true;
+                    } else 
+                    {
+                        syntaxResult.Parseable = false;
+                        string[] errorMessages = new string[result.Errors.Count()];
+                        for (int i = 0; i < result.Errors.Count(); i++)
+                        {
+                            errorMessages[i] = result.Errors.ElementAt(i).Message;
+                        }
+                        syntaxResult.Errors = errorMessages;
+                    }
+                    await requestContext.SendResult(syntaxResult);
+                }
+                catch (Exception ex)
+                {
+                    await requestContext.SendError(ex.ToString());
+                }
+            });
+        }
+
         /// <summary>
         /// Auto-complete completion provider request callback
         /// </summary>
@@ -499,7 +536,6 @@ namespace Microsoft.SqlTools.ServiceLayer.LanguageServices
                         await requestContext.SendResult(hover);
                     }
                 }
-
                 await requestContext.SendResult(null);
             }
             catch (Exception ex)

src/Microsoft.SqlTools.ServiceLayer/QueryExecution/QueryExecutionService.cs

@@ -3,20 +3,22 @@
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 //
 using System;
-using System.Collections.Concurrent;
 using System.IO;
+using System.Linq;
+using System.Collections.Concurrent;
 using System.Threading.Tasks;
+using Microsoft.SqlTools.Hosting.Protocol;
 using Microsoft.SqlTools.ServiceLayer.Connection;
 using Microsoft.SqlTools.ServiceLayer.Connection.Contracts;
-using Microsoft.SqlTools.Hosting.Protocol;
 using Microsoft.SqlTools.ServiceLayer.QueryExecution.Contracts;
 using Microsoft.SqlTools.ServiceLayer.QueryExecution.Contracts.ExecuteRequests;
 using Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage;
 using Microsoft.SqlTools.ServiceLayer.SqlContext;
 using Microsoft.SqlTools.ServiceLayer.Workspace;
 using Microsoft.SqlTools.ServiceLayer.Workspace.Contracts;
-using Microsoft.SqlTools.Utility;
 using Microsoft.SqlTools.ServiceLayer.Hosting;
+using Microsoft.SqlTools.Utility;
+
 
 namespace Microsoft.SqlTools.ServiceLayer.QueryExecution
 {
@@ -573,6 +575,8 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution
 
         #region Private Helpers
 
+
+
         private Query CreateQuery(ExecuteRequestParamsBase executeParams, ConnectionInfo connInfo)
         {
             // Attempt to get the connection for the editor