Execute SQL statement at cursor location (#412)

* Stage changes to other machine

* Parse sql statement from script document

* Fix a few typos and minor changes

* Fix bug

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

@@ -1679,5 +1679,42 @@ namespace Microsoft.SqlTools.ServiceLayer.LanguageServices
                 FileUtilities.SafeDirectoryDelete(FileUtilities.PeekDefinitionTempFolder, true);
             }
         }
+
+        internal string ParseStatementAtPosition(string sql, int line, int column)
+        {
+            // adjust from 0-based to 1-based index
+            int parserLine = line + 1;
+            int parserColumn = column + 1;
+
+            // parse current SQL file contents to retrieve a list of errors
+            ParseResult parseResult = Parser.Parse(sql, this.DefaultParseOptions);
+            if (parseResult != null && parseResult.Script != null && parseResult.Script.Batches != null)
+            {
+                foreach (var batch in parseResult.Script.Batches)
+                {
+                    if (batch.Statements == null)
+                    {
+                        continue;
+                    }
+
+                    // check if the batch matches parameters
+                    if (batch.StartLocation.LineNumber <= parserLine 
+                        && batch.EndLocation.LineNumber >= parserLine)
+                    {
+                        foreach (var statement in batch.Statements)
+                        {
+                            // check if the statement matches parameters
+                            if (statement.StartLocation.LineNumber <= parserLine 
+                                && statement.EndLocation.LineNumber >= parserLine)
+                            {
+                                return statement.Sql;
+                            }
+                        }
+                    }
+                }
+            }
+
+            return string.Empty;
+        }
     }
 }

src/Microsoft.SqlTools.ServiceLayer/QueryExecution/Contracts/ExecuteRequests/ExecuteDocumentStatementRequest.cs

@@ -0,0 +1,32 @@
+//
+// 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;
+
+namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.Contracts.ExecuteRequests
+{
+    /// <summary>
+    /// Parameters for executing a query from a document open in the workspace
+    /// </summary>
+    public class ExecuteDocumentStatementParams : ExecuteRequestParamsBase
+    {
+        /// <summary>
+        /// Line in the document for the location of the SQL statement
+        /// </summary>
+        public int Line { get; set; }
+
+        /// <summary>
+        /// Column in the document for the location of the SQL statement
+        /// </summary>
+        public int Column { get; set; }        
+    }
+    
+    public class ExecuteDocumentStatementRequest
+    {
+        public static readonly 
+            RequestType<ExecuteDocumentStatementParams, ExecuteRequestResult> Type = 
+            RequestType<ExecuteDocumentStatementParams, ExecuteRequestResult>.Create("query/executedocumentstatement");
+    }
+}

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

@@ -129,6 +129,7 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution
         {
             // Register handlers for requests
             serviceHost.SetRequestHandler(ExecuteDocumentSelectionRequest.Type, HandleExecuteRequest);
+            serviceHost.SetRequestHandler(ExecuteDocumentStatementRequest.Type, HandleExecuteRequest);
             serviceHost.SetRequestHandler(ExecuteStringRequest.Type, HandleExecuteRequest);
             serviceHost.SetRequestHandler(SubsetRequest.Type, HandleResultSubsetRequest);
             serviceHost.SetRequestHandler(QueryDisposeRequest.Type, HandleDisposeRequest);
@@ -691,32 +692,14 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution
             ExecuteDocumentSelectionParams docRequest = request as ExecuteDocumentSelectionParams;
             if (docRequest != null)
             {
-                // Get the document from the parameters
-                ScriptFile queryFile = WorkspaceService.Workspace.GetFile(docRequest.OwnerUri);
-                if (queryFile == null)
-                {
-                    return string.Empty;
-                }
-                // If a selection was not provided, use the entire document
-                if (docRequest.QuerySelection == null)
-                {
-                    return queryFile.Contents;
-                }
+                return GetSqlTextFromSelectionData(docRequest.OwnerUri, docRequest.QuerySelection);
+            }
 
-                // A selection was provided, so get the lines in the selected range
-                string[] queryTextArray = queryFile.GetLinesInRange(
-                    new BufferRange(
-                        new BufferPosition(
-                            docRequest.QuerySelection.StartLine + 1,
-                            docRequest.QuerySelection.StartColumn + 1
-                        ),
-                        new BufferPosition(
-                            docRequest.QuerySelection.EndLine + 1,
-                            docRequest.QuerySelection.EndColumn + 1
-                        )
-                    )
-                );
-                return string.Join(Environment.NewLine, queryTextArray);
+             // If it is a document statement, we'll retrieve the text from the document
+            ExecuteDocumentStatementParams stmtRequest = request as ExecuteDocumentStatementParams;
+            if (stmtRequest != null)
+            {
+                return GetSqlStatementAtPosition(stmtRequest.OwnerUri, stmtRequest.Line, stmtRequest.Column);
             }
 
             // If it is an ExecuteStringParams, return the text as is
@@ -730,6 +713,55 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution
             throw new InvalidCastException("Invalid request type");
         }
 
+        /// <summary>
+        /// Return portion of document corresponding to the selection range
+        /// </summary>
+        internal string GetSqlTextFromSelectionData(string ownerUri, SelectionData selection)
+        {
+            // Get the document from the parameters
+            ScriptFile queryFile = WorkspaceService.Workspace.GetFile(ownerUri);
+            if (queryFile == null)
+            {
+                return string.Empty;
+            }
+            // If a selection was not provided, use the entire document
+            if (selection == null)
+            {
+                return queryFile.Contents;
+            }
+
+            // A selection was provided, so get the lines in the selected range
+            string[] queryTextArray = queryFile.GetLinesInRange(
+                new BufferRange(
+                    new BufferPosition(
+                        selection.StartLine + 1,
+                        selection.StartColumn + 1
+                    ),
+                    new BufferPosition(
+                        selection.EndLine + 1,
+                        selection.EndColumn + 1
+                    )
+                )
+            );
+            return string.Join(Environment.NewLine, queryTextArray);
+        }
+
+        /// <summary>
+        /// Return portion of document corresponding to the statement at the line and column
+        /// </summary>
+        internal string GetSqlStatementAtPosition(string ownerUri, int line, int column)
+        {
+            // Get the document from the parameters
+            ScriptFile queryFile = WorkspaceService.Workspace.GetFile(ownerUri);
+            if (queryFile == null)
+            {
+                return string.Empty;
+            }
+
+            return LanguageServices.LanguageService.Instance.ParseStatementAtPosition(
+                queryFile.Contents, line, column);
+        }
+
         /// Internal for testing purposes
         internal Task UpdateSettings(SqlToolsSettings newSettings, SqlToolsSettings oldSettings, EventContext eventContext)
         {

test/Microsoft.SqlTools.ServiceLayer.UnitTests/QueryExecution/Execution/ServiceIntegrationTests.cs

@@ -21,6 +21,20 @@ namespace Microsoft.SqlTools.ServiceLayer.UnitTests.QueryExecution.Execution
 
         #region Get SQL Tests
 
+         [Fact]
+        public void ExecuteDocumentStatementTest()
+        {            
+            string query = string.Format("{0}{1}GO{1}{0}", Constants.StandardQuery, Environment.NewLine);
+            var workspaceService = GetDefaultWorkspaceService(query);
+            var queryService = new QueryExecutionService(null, workspaceService);
+
+            var queryParams = new ExecuteDocumentStatementParams { OwnerUri = Constants.OwnerUri, Line = 0, Column = 0 };
+            var queryText = queryService.GetSqlText(queryParams);
+
+            // The text should match the standard query
+            Assert.Equal(queryText, Constants.StandardQuery);
+        }
+
         [Fact]
         public void GetSqlTextFromDocumentRequestFull()
         {