From abc14c6a52d303a4f97e9bc3745f4187f53e0547 Mon Sep 17 00:00:00 2001
From: "Hongyang Du (hond)" <hond@microsoft.com>
Date: Mon, 20 Apr 2020 23:44:32 +0800
Subject: [PATCH] [LG] Robust Template CRUD with Two-phase parsing of LG
 (#3731)

* init

* init

* init

* init

* init

* init

* init

* fix error

* remove unused code

* remove unused file

* remove unused code

* fix build error

* fix error

* refine

* only allow define option/import at the top of lg file.

* refine import recognization

* add more comments and remove unused code

* remove unused antlr file

* remove antlr related file

* fix build warning

* refine

* fix error

* fix error

* fix error

* add context for Template and TemplateImport

* fix comments

* fix comments

* fix comments

* rename templatebody to body to avoid the same context name
---
 CodeCoverage.runsettings                      |   2 +
 .../parser/ExpressionAntlrLexer.g4            |   3 +
 .../parser/ExpressionAntlrParser.g4           |   3 +
 .../parser/ExpressionParser.cs                |   2 -
 .../Analyzer.cs                               |  40 +-
 .../AnalyzerResult.cs                         |   2 +-
 .../CustomizedMemory.cs                       |  12 +-
 .../ErrorListener.cs                          |   8 +-
 .../EvaluationTarget.cs                       |   8 +-
 .../Evaluator.cs                              |  60 +--
 .../Expander.cs                               |  53 +--
 .../Extensions.cs                             |  51 ++-
 .../LGFileLexer.g4                            | 251 +---------
 .../LGFileParser.g4                           | 145 ++----
 .../LGTemplateLexer.g4                        | 202 ++++++++
 .../LGTemplateParser.g4                       |  93 ++++
 .../Range.cs                                  |  11 +-
 .../SourceRange.cs                            |  50 ++
 .../StaticChecker.cs                          | 114 ++---
 .../Template.cs                               | 137 ++----
 .../TemplateErrors.cs                         |   4 +-
 .../TemplateImport.cs                         |  54 +--
 .../Templates.cs                              |  62 +--
 .../TemplatesParser.cs                        | 431 +++++++++++-------
 .../en-us/sandwichTest-Bread.en-us.lg         |   7 +-
 .../en-us/sandwichTest-BreadEntity.en-us.lg   |   5 +-
 .../en-us/sandwichTest-Cheese.en-us.lg        |   7 +-
 .../en-us/sandwichTest-CheeseEntity.en-us.lg  |   5 +-
 .../en-us/sandwichTest-Length.en-us.lg        |   5 +-
 .../sandwich/en-us/sandwichTest-Meat.en-us.lg |   7 +-
 .../en-us/sandwichTest-MeatEntity.en-us.lg    |   5 +-
 .../sandwich/en-us/sandwichTest-Name.en-us.lg |   7 +-
 .../en-us/sandwichTest-Price.en-us.lg         |   5 +-
 .../en-us/sandwichTest-Quantity.en-us.lg      |   7 +-
 .../sandwichTest-library-Assign.en-us.lg      |   5 +-
 .../sandwichTest-library-Choose.en-us.lg      |   5 +-
 .../en-us/sandwichTest-library-Help.en-us.lg  |   3 +-
 .../sandwichTest-library-Missing.en-us.lg     |   5 +-
 .../sandwichTest-library-ReadForm.en-us.lg    |   3 +-
 .../en-us/sandwichTest-library.en-us.lg       |   3 +-
 .../unittests/en-us/unittests-Age.en-us.lg    |   5 +-
 .../en-us/unittests-Datetimev2.en-us.lg       |   5 +-
 .../en-us/unittests-Dimension.en-us.lg        |   5 +-
 .../unittests/en-us/unittests-Email.en-us.lg  |   7 +-
 .../unittests/en-us/unittests-Enum1.en-us.lg  |   7 +-
 .../en-us/unittests-Enum1Entity.en-us.lg      |   5 +-
 .../unittests/en-us/unittests-Enum2.en-us.lg  |   7 +-
 .../en-us/unittests-Enum2Entity.en-us.lg      |   5 +-
 .../en-us/unittests-Geographyv2.en-us.lg      |   5 +-
 .../unittests-Keyphraseproperty.en-us.lg      |   7 +-
 .../unittests/en-us/unittests-Money.en-us.lg  |   5 +-
 .../en-us/unittests-Ordinalv2.en-us.lg        |   5 +-
 .../en-us/unittests-Percentage.en-us.lg       |   7 +-
 .../en-us/unittests-Personname.en-us.lg       |   7 +-
 .../en-us/unittests-Phonenumber.en-us.lg      |   7 +-
 .../en-us/unittests-Quantity.en-us.lg         |   7 +-
 .../en-us/unittests-Temperature.en-us.lg      |   5 +-
 .../unittests/en-us/unittests-Url.en-us.lg    |   7 +-
 .../unittests-Utteranceproperty.en-us.lg      |   7 +-
 .../en-us/unittests-Zipcodepattern.en-us.lg   |   7 +-
 .../en-us/unittests-library-Assign.en-us.lg   |   5 +-
 .../en-us/unittests-library-Choose.en-us.lg   |   5 +-
 .../en-us/unittests-library-Help.en-us.lg     |   3 +-
 .../en-us/unittests-library-Missing.en-us.lg  |   5 +-
 .../en-us/unittests-library-ReadForm.en-us.lg |   3 +-
 .../en-us/unittests-library.en-us.lg          |   3 +-
 .../Examples/CustomFunction.lg                |   5 +-
 .../Examples/import.lg                        |   9 +-
 .../Examples/import2.lg                       |   8 +-
 .../ExceptionExamples/ConditionFormatError.lg |   4 +-
 .../DuplicatedTemplatesInImportFiles.lg       |   5 +-
 .../ExceptionExamples/ErrorLine.lg            |   9 +
 .../InvalidLGFileImportPath.lg                |   7 +-
 .../ExceptionExamples/MultiLineExprError.lg   |  15 -
 ...ot.Builder.LanguageGeneration.Tests.csproj |   4 +
 .../TemplateDiagnosticTest.cs                 |  22 +-
 .../TemplatesTest.cs                          |   2 +-
 .../sandwich/en-us/sandwich-Bread.en-us.lg    |   7 +-
 .../en-us/sandwich-BreadEntity.en-us.lg       |   5 +-
 .../sandwich/en-us/sandwich-Cheese.en-us.lg   |   7 +-
 .../en-us/sandwich-CheeseEntity.en-us.lg      |   5 +-
 .../sandwich/en-us/sandwich-Length.en-us.lg   |   5 +-
 .../sandwich/en-us/sandwich-Meat.en-us.lg     |   7 +-
 .../en-us/sandwich-MeatEntity.en-us.lg        |   5 +-
 .../sandwich/en-us/sandwich-Name.en-us.lg     |   7 +-
 .../sandwich/en-us/sandwich-Price.en-us.lg    |   5 +-
 .../sandwich/en-us/sandwich-Quantity.en-us.lg |   7 +-
 .../en-us/sandwich-library-Assign.en-us.lg    |   5 +-
 .../en-us/sandwich-library-Choose.en-us.lg    |   5 +-
 .../en-us/sandwich-library-Help.en-us.lg      |   3 +-
 .../en-us/sandwich-library-Missing.en-us.lg   |   5 +-
 .../en-us/sandwich-library-ReadForm.en-us.lg  |   3 +-
 .../sandwich/en-us/sandwich-library.en-us.lg  |   2 +-
 93 files changed, 1080 insertions(+), 1121 deletions(-)
 create mode 100644 libraries/Microsoft.Bot.Builder.LanguageGeneration/LGTemplateLexer.g4
 create mode 100644 libraries/Microsoft.Bot.Builder.LanguageGeneration/LGTemplateParser.g4
 create mode 100644 libraries/Microsoft.Bot.Builder.LanguageGeneration/SourceRange.cs
 create mode 100644 tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/ExceptionExamples/ErrorLine.lg

diff --git a/CodeCoverage.runsettings b/CodeCoverage.runsettings
index 12529d305..6575840af 100644
--- a/CodeCoverage.runsettings
+++ b/CodeCoverage.runsettings
@@ -77,6 +77,8 @@
                 <Source>.*\\ExpressionAntlrParser.cs</Source>
                 <Source>.*\\LGFileLexer.cs</Source>
                 <Source>.*\\LGFileParser.cs</Source>
+                <Source>.*\\LGTemplateLexer.cs</Source>
+                <Source>.*\\LGTemplateParser.cs</Source>
               </Exclude>
             </Sources>
           </CodeCoverage>
diff --git a/libraries/AdaptiveExpressions/parser/ExpressionAntlrLexer.g4 b/libraries/AdaptiveExpressions/parser/ExpressionAntlrLexer.g4
index 3758d022a..bd1e0f27f 100644
--- a/libraries/AdaptiveExpressions/parser/ExpressionAntlrLexer.g4
+++ b/libraries/AdaptiveExpressions/parser/ExpressionAntlrLexer.g4
@@ -1,5 +1,8 @@
 lexer grammar ExpressionAntlrLexer;
 
+@parser::header {#pragma warning disable 3021} // Disable StyleCop warning CS3021 re CLSCompliant attribute in generated files.
+@lexer::header {#pragma warning disable 3021} // Disable StyleCop warning CS3021 re CLSCompliant attribute in generated files.
+
 @lexer::members {
   bool ignoreWS = true;      // usually we ignore whitespace, but inside stringInterpolation, whitespace is significant
 }
diff --git a/libraries/AdaptiveExpressions/parser/ExpressionAntlrParser.g4 b/libraries/AdaptiveExpressions/parser/ExpressionAntlrParser.g4
index fe67ef460..7c5c3ef04 100644
--- a/libraries/AdaptiveExpressions/parser/ExpressionAntlrParser.g4
+++ b/libraries/AdaptiveExpressions/parser/ExpressionAntlrParser.g4
@@ -1,5 +1,8 @@
 parser grammar ExpressionAntlrParser;
 
+@parser::header {#pragma warning disable 3021} // Disable StyleCop warning CS3021 re CLSCompliant attribute in generated files.
+@lexer::header {#pragma warning disable 3021} // Disable StyleCop warning CS3021 re CLSCompliant attribute in generated files.
+
 options { tokenVocab=ExpressionAntlrLexer; }
 
 file: expression EOF;
diff --git a/libraries/AdaptiveExpressions/parser/ExpressionParser.cs b/libraries/AdaptiveExpressions/parser/ExpressionParser.cs
index 4addf0b15..97639f9ee 100644
--- a/libraries/AdaptiveExpressions/parser/ExpressionParser.cs
+++ b/libraries/AdaptiveExpressions/parser/ExpressionParser.cs
@@ -13,8 +13,6 @@ using Antlr4.Runtime.Misc;
 using Antlr4.Runtime.Tree;
 using Newtonsoft.Json.Linq;
 
-[assembly: CLSCompliant(false)]
-
 namespace AdaptiveExpressions
 {
     /// <summary>
diff --git a/libraries/Microsoft.Bot.Builder.LanguageGeneration/Analyzer.cs b/libraries/Microsoft.Bot.Builder.LanguageGeneration/Analyzer.cs
index 0e2bddd2a..1afe3b3e0 100644
--- a/libraries/Microsoft.Bot.Builder.LanguageGeneration/Analyzer.cs
+++ b/libraries/Microsoft.Bot.Builder.LanguageGeneration/Analyzer.cs
@@ -12,7 +12,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
     /// <summary>
     /// LG template analyzer.
     /// </summary>
-    public class Analyzer : LGFileParserBaseVisitor<AnalyzerResult>
+    public class Analyzer : LGTemplateParserBaseVisitor<AnalyzerResult>
     {
         private readonly Dictionary<string, Template> templateMap;
 
@@ -23,8 +23,8 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// <summary>
         /// Initializes a new instance of the <see cref="Analyzer"/> class.
         /// </summary>
-        /// <param name="templates">template list.</param>
-        /// <param name="expressionParser">expression parser.</param>
+        /// <param name="templates">Template list.</param>
+        /// <param name="expressionParser">Expression parser.</param>
         public Analyzer(List<Template> templates, ExpressionParser expressionParser)
         {
             Templates = templates;
@@ -47,7 +47,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// Analyzer a template to get the static analyzer results.
         /// </summary>
         /// <param name="templateName">Template name.</param>
-        /// <returns>analyze result including variables and template references.</returns>
+        /// <returns>Analyze result including variables and template references.</returns>
         public AnalyzerResult AnalyzeTemplate(string templateName)
         {
             if (!templateMap.ContainsKey(templateName))
@@ -67,29 +67,15 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
             // because given we don't track down for templates have parameters
             // the only scenario that we are still analyzing an parameterized template is
             // this template is root template to analyze, in this we also don't have exclude parameters
-            var dependencies = Visit(templateMap[templateName].ParseTree);
+            var dependencies = Visit(templateMap[templateName].TemplateBodyParseTree);
             evaluationTargetStack.Pop();
 
             return dependencies;
         }
 
-        public override AnalyzerResult VisitTemplateDefinition([NotNull] LGFileParser.TemplateDefinitionContext context)
-        {
-            var templateNameContext = context.templateNameLine();
-            if (templateNameContext.templateName().GetText().Equals(CurrentTarget().TemplateName))
-            {
-                if (context.templateBody() != null)
-                {
-                    return Visit(context.templateBody());
-                }
-            }
+        public override AnalyzerResult VisitNormalBody([NotNull] LGTemplateParser.NormalBodyContext context) => Visit(context.normalTemplateBody());
 
-            return new AnalyzerResult();
-        }
-
-        public override AnalyzerResult VisitNormalBody([NotNull] LGFileParser.NormalBodyContext context) => Visit(context.normalTemplateBody());
-
-        public override AnalyzerResult VisitNormalTemplateBody([NotNull] LGFileParser.NormalTemplateBodyContext context)
+        public override AnalyzerResult VisitNormalTemplateBody([NotNull] LGTemplateParser.NormalTemplateBodyContext context)
         {
             var result = new AnalyzerResult();
 
@@ -102,7 +88,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
             return result;
         }
 
-        public override AnalyzerResult VisitStructuredTemplateBody([NotNull] LGFileParser.StructuredTemplateBodyContext context)
+        public override AnalyzerResult VisitStructuredTemplateBody([NotNull] LGTemplateParser.StructuredTemplateBodyContext context)
         {
             var result = new AnalyzerResult();
 
@@ -123,7 +109,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
             return result;
         }
 
-        public override AnalyzerResult VisitIfElseBody([NotNull] LGFileParser.IfElseBodyContext context)
+        public override AnalyzerResult VisitIfElseBody([NotNull] LGTemplateParser.IfElseBodyContext context)
         {
             var result = new AnalyzerResult();
 
@@ -145,7 +131,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
             return result;
         }
 
-        public override AnalyzerResult VisitSwitchCaseBody([NotNull] LGFileParser.SwitchCaseBodyContext context)
+        public override AnalyzerResult VisitSwitchCaseBody([NotNull] LGTemplateParser.SwitchCaseBodyContext context)
         {
             var result = new AnalyzerResult();
             var switchCaseNodes = context.switchCaseTemplateBody().switchCaseRule();
@@ -166,7 +152,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
             return result;
         }
 
-        public override AnalyzerResult VisitNormalTemplateString([NotNull] LGFileParser.NormalTemplateStringContext context)
+        public override AnalyzerResult VisitNormalTemplateString([NotNull] LGTemplateParser.NormalTemplateStringContext context)
         {
             var result = new AnalyzerResult();
             foreach (var expression in context.EXPRESSION())
@@ -177,7 +163,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
             return result;
         }
 
-        private AnalyzerResult VisitStructureValue(LGFileParser.KeyValueStructureLineContext context)
+        private AnalyzerResult VisitStructureValue(LGTemplateParser.KeyValueStructureLineContext context)
         {
             var values = context.keyValueStructureValue();
 
@@ -211,7 +197,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// return only those without parameters.
         /// </summary>
         /// <param name="exp">Expression.</param>
-        /// <returns>template refs.</returns>
+        /// <returns>Template refs.</returns>
         private AnalyzerResult AnalyzeExpressionDirectly(Expression exp)
         {
             var result = new AnalyzerResult();
diff --git a/libraries/Microsoft.Bot.Builder.LanguageGeneration/AnalyzerResult.cs b/libraries/Microsoft.Bot.Builder.LanguageGeneration/AnalyzerResult.cs
index 925fb981a..9af881c5d 100644
--- a/libraries/Microsoft.Bot.Builder.LanguageGeneration/AnalyzerResult.cs
+++ b/libraries/Microsoft.Bot.Builder.LanguageGeneration/AnalyzerResult.cs
@@ -35,7 +35,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// Gets or sets template references that this template contains.
         /// </summary>
         /// <value>
-        /// template references that this template contains.
+        /// Template references that this template contains.
         /// </value>
         public List<string> TemplateReferences { get; set; }
 
diff --git a/libraries/Microsoft.Bot.Builder.LanguageGeneration/CustomizedMemory.cs b/libraries/Microsoft.Bot.Builder.LanguageGeneration/CustomizedMemory.cs
index 5a2204b76..2db4201af 100644
--- a/libraries/Microsoft.Bot.Builder.LanguageGeneration/CustomizedMemory.cs
+++ b/libraries/Microsoft.Bot.Builder.LanguageGeneration/CustomizedMemory.cs
@@ -17,7 +17,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// <summary>
         /// Initializes a new instance of the <see cref="CustomizedMemory"/> class.
         /// </summary>
-        /// <param name="scope">scope.</param>
+        /// <param name="scope">Scope.</param>
         public CustomizedMemory(object scope)
         {
             this.GlobalMemory = scope == null ? null : MemoryFactory.Create(scope);
@@ -27,8 +27,8 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// <summary>
         /// Initializes a new instance of the <see cref="CustomizedMemory"/> class.
         /// </summary>
-        /// <param name="globalMemory">global memory.</param>
-        /// <param name="localMemory">local memory.</param>
+        /// <param name="globalMemory">Global memory.</param>
+        /// <param name="localMemory">Local memory.</param>
         public CustomizedMemory(IMemory globalMemory, IMemory localMemory = null)
         {
             this.GlobalMemory = globalMemory;
@@ -60,9 +60,9 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// Try to get the value from a given path. Firstly, get result from global memory,
         /// if global memory does not contain, get from local memory.
         /// </summary>
-        /// <param name="path">memory path.</param>
-        /// <param name="value">resolved value.</param>
-        /// <returns> true if the memory contains an element with the specified key; otherwise, false.</returns>
+        /// <param name="path">Memory path.</param>
+        /// <param name="value">Resolved value.</param>
+        /// <returns>True if the memory contains an element with the specified key; otherwise, false.</returns>
         public bool TryGetValue(string path, out object value)
         {
             value = null;
diff --git a/libraries/Microsoft.Bot.Builder.LanguageGeneration/ErrorListener.cs b/libraries/Microsoft.Bot.Builder.LanguageGeneration/ErrorListener.cs
index 00405696e..139971aa7 100644
--- a/libraries/Microsoft.Bot.Builder.LanguageGeneration/ErrorListener.cs
+++ b/libraries/Microsoft.Bot.Builder.LanguageGeneration/ErrorListener.cs
@@ -14,16 +14,18 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
     public class ErrorListener : BaseErrorListener
     {
         private readonly string source;
+        private readonly int lineOffset;
 
-        public ErrorListener(string errorSource)
+        public ErrorListener(string errorSource, int lineOffset = 0)
         {
             source = errorSource;
+            this.lineOffset = lineOffset;
         }
 
         public override void SyntaxError([NotNull] IRecognizer recognizer, [Nullable] IToken offendingSymbol, int line, int charPositionInLine, [NotNull] string msg, [Nullable] RecognitionException e)
         {
-            var startPosition = new Position(line, charPositionInLine);
-            var stopPosition = new Position(line, charPositionInLine + offendingSymbol.StopIndex - offendingSymbol.StartIndex + 1);
+            var startPosition = new Position(lineOffset + line, charPositionInLine);
+            var stopPosition = new Position(lineOffset + line, charPositionInLine + offendingSymbol.StopIndex - offendingSymbol.StartIndex + 1);
             var range = new Range(startPosition, stopPosition);
             var diagnostic = new Diagnostic(range, TemplateErrors.SyntaxError, DiagnosticSeverity.Error, source);
             throw new TemplateException(diagnostic.ToString(), new List<Diagnostic>() { diagnostic });
diff --git a/libraries/Microsoft.Bot.Builder.LanguageGeneration/EvaluationTarget.cs b/libraries/Microsoft.Bot.Builder.LanguageGeneration/EvaluationTarget.cs
index 2e9058523..4848c2e39 100644
--- a/libraries/Microsoft.Bot.Builder.LanguageGeneration/EvaluationTarget.cs
+++ b/libraries/Microsoft.Bot.Builder.LanguageGeneration/EvaluationTarget.cs
@@ -13,8 +13,8 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// <summary>
         /// Initializes a new instance of the <see cref="EvaluationTarget"/> class.
         /// </summary>
-        /// <param name="templateName">template name.</param>
-        /// <param name="scope">template scope.</param>
+        /// <param name="templateName">Template name.</param>
+        /// <param name="scope">Template scope.</param>
         public EvaluationTarget(string templateName, object scope)
         {
             TemplateName = templateName;
@@ -33,7 +33,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// Gets or sets template name.
         /// </summary>
         /// <value>
-        /// template name.
+        /// Template name.
         /// </value>
         public string TemplateName { get; set; }
 
@@ -49,7 +49,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// Get current instance id. If two target has the same Id,
         /// we can say they have the same template evaluation.
         /// </summary>
-        /// <returns>id.</returns>
+        /// <returns>Id.</returns>
         public string GetId()
         {
             var memory = (CustomizedMemory)Scope;
diff --git a/libraries/Microsoft.Bot.Builder.LanguageGeneration/Evaluator.cs b/libraries/Microsoft.Bot.Builder.LanguageGeneration/Evaluator.cs
index 275e78a2d..42d78e9a3 100644
--- a/libraries/Microsoft.Bot.Builder.LanguageGeneration/Evaluator.cs
+++ b/libraries/Microsoft.Bot.Builder.LanguageGeneration/Evaluator.cs
@@ -19,7 +19,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
     /// <summary>
     /// LG template Evaluator.
     /// </summary>
-    public class Evaluator : LGFileParserBaseVisitor<object>
+    public class Evaluator : LGTemplateParserBaseVisitor<object>
     {
         public const string LGType = "lgType";
 
@@ -34,8 +34,8 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// Initializes a new instance of the <see cref="Evaluator"/> class.
         /// </summary>
         /// <param name="templates">Template list.</param>
-        /// <param name="expressionParser">expression parser.</param>
-        /// <param name="strictMode">strict mode. If strictMode == true, exception in expression would throw outside.</param>
+        /// <param name="expressionParser">Expression parser.</param>
+        /// <param name="strictMode">Strict mode. If strictMode == true, exception in expression would throw outside.</param>
         public Evaluator(List<Template> templates, ExpressionParser expressionParser, bool strictMode = false)
         {
             Templates = templates;
@@ -73,8 +73,8 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// <summary>
         /// Evaluate a template with given name and scope.
         /// </summary>
-        /// <param name="inputTemplateName">template name.</param>
-        /// <param name="scope">scope.</param>
+        /// <param name="inputTemplateName">Template name.</param>
+        /// <param name="scope">Scope.</param>
         /// <returns>Evaluate result.</returns>
         public object EvaluateTemplate(string inputTemplateName, object scope)
         {
@@ -112,7 +112,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
 
             // Using a stack to track the evaluation trace
             evaluationTargetStack.Push(templateTarget);
-            var result = Visit(TemplateMap[templateName].ParseTree);
+            var result = Visit(TemplateMap[templateName].TemplateBodyParseTree);
             if (previousEvaluateTarget != null)
             {
                 previousEvaluateTarget.EvaluatedChildren[currentEvaluateId] = result;
@@ -123,18 +123,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
             return result;
         }
 
-        public override object VisitTemplateDefinition([NotNull] LGFileParser.TemplateDefinitionContext context)
-        {
-            var templateNameContext = context.templateNameLine();
-            if (templateNameContext.templateName().GetText().Equals(CurrentTarget().TemplateName))
-            {
-                return Visit(context.templateBody());
-            }
-
-            return null;
-        }
-
-        public override object VisitStructuredTemplateBody([NotNull] LGFileParser.StructuredTemplateBodyContext context)
+        public override object VisitStructuredTemplateBody([NotNull] LGTemplateParser.StructuredTemplateBodyContext context)
         {
             var result = new JObject();
             var typeName = context.structuredBodyNameLine().STRUCTURE_NAME().GetText();
@@ -173,16 +162,16 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
             return result;
         }
 
-        public override object VisitNormalBody([NotNull] LGFileParser.NormalBodyContext context) => Visit(context.normalTemplateBody());
+        public override object VisitNormalBody([NotNull] LGTemplateParser.NormalBodyContext context) => Visit(context.normalTemplateBody());
 
-        public override object VisitNormalTemplateBody([NotNull] LGFileParser.NormalTemplateBodyContext context)
+        public override object VisitNormalTemplateBody([NotNull] LGTemplateParser.NormalTemplateBodyContext context)
         {
             var normalTemplateStrs = context.templateString();
             var rd = new Random();
             return Visit(normalTemplateStrs[rd.Next(normalTemplateStrs.Length)].normalTemplateString());
         }
 
-        public override object VisitIfElseBody([NotNull] LGFileParser.IfElseBodyContext context)
+        public override object VisitIfElseBody([NotNull] LGTemplateParser.IfElseBodyContext context)
         {
             var ifRules = context.ifElseTemplateBody().ifConditionRule();
             foreach (var ifRule in ifRules)
@@ -196,7 +185,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
             return null;
         }
 
-        public override object VisitSwitchCaseBody([NotNull] LGFileParser.SwitchCaseBodyContext context)
+        public override object VisitSwitchCaseBody([NotNull] LGTemplateParser.SwitchCaseBodyContext context)
         {
             var switchCaseNodes = context.switchCaseTemplateBody().switchCaseRule();
             var length = switchCaseNodes.Length;
@@ -240,7 +229,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
             return null;
         }
 
-        public override object VisitNormalTemplateString([NotNull] LGFileParser.NormalTemplateStringContext context)
+        public override object VisitNormalTemplateString([NotNull] LGTemplateParser.NormalTemplateStringContext context)
         {
             var prefixErrorMsg = context.GetPrefixErrorMessage();
 
@@ -249,14 +238,14 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
             {
                 switch (node.Symbol.Type)
                 {
-                    case LGFileParser.DASH:
-                    case LGFileParser.MULTILINE_PREFIX:
-                    case LGFileParser.MULTILINE_SUFFIX:
+                    case LGTemplateParser.DASH:
+                    case LGTemplateParser.MULTILINE_PREFIX:
+                    case LGTemplateParser.MULTILINE_SUFFIX:
                         break;
-                    case LGFileParser.ESCAPE_CHARACTER:
+                    case LGTemplateParser.ESCAPE_CHARACTER:
                         result.Add(node.GetText().Escape());
                         break;
-                    case LGFileParser.EXPRESSION:
+                    case LGTemplateParser.EXPRESSION:
                         result.Add(EvalExpression(node.GetText(), context, prefixErrorMsg));
                         break;
                     default:
@@ -345,7 +334,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
             throw new Exception(ConcatErrorMsg(childErrorMsg, errorMsg));
         }
 
-        private object VisitStructureValue(LGFileParser.KeyValueStructureLineContext context)
+        private object VisitStructureValue(LGTemplateParser.KeyValueStructureLineContext context)
         {
             var values = context.keyValueStructureValue();
 
@@ -363,10 +352,10 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
                     {
                         switch (node.Symbol.Type)
                         {
-                            case LGFileParser.ESCAPE_CHARACTER_IN_STRUCTURE_BODY:
+                            case LGTemplateParser.ESCAPE_CHARACTER_IN_STRUCTURE_BODY:
                                 itemStringResult.Append(node.GetText().Replace(@"\|", "|").Escape());
                                 break;
-                            case LGFileParser.EXPRESSION_IN_STRUCTURE_BODY:
+                            case LGTemplateParser.EXPRESSION_IN_STRUCTURE_BODY:
                                 var errorPrefix = "Property '" + context.STRUCTURE_IDENTIFIER().GetText() + "':";
                                 itemStringResult.Append(EvalExpression(node.GetText(), context, errorPrefix));
                                 break;
@@ -383,7 +372,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
             return result.Count == 1 ? result[0] : result;
         }
 
-        private bool EvalCondition(LGFileParser.IfConditionContext condition)
+        private bool EvalCondition(LGTemplateParser.IfConditionContext condition)
         {
             var expression = condition.EXPRESSION(0);
             if (expression == null || // no expression means it's else
@@ -452,7 +441,8 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         private (object value, string error) EvalByAdaptiveExpression(string exp, object scope)
         {
             var parse = this.ExpressionParser.Parse(exp);
-            return parse.TryEvaluate(scope);
+            var result = parse.TryEvaluate(scope);
+            return result;
         }
 
         // Generate a new lookup function based on one lookup function
@@ -555,7 +545,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
             else
             {
                 var template = TemplateMap[CurrentTarget().TemplateName];
-                var sourcePath = template.Source.NormalizePath();
+                var sourcePath = template.SourceRange.Source.NormalizePath();
                 var baseFolder = Environment.CurrentDirectory;
                 if (Path.IsPathRooted(sourcePath))
                 {
@@ -587,7 +577,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
 
             if ((children0.ReturnType & ReturnType.Object) == 0 && (children0.ReturnType & ReturnType.String) == 0)
             {
-                throw new Exception(TemplateErrors.ErrorTemplateNameformat(children0.ToString()));
+                throw new Exception(TemplateErrors.InvalidTemplateName);
             }
 
             // Validate more if the name is string constant
diff --git a/libraries/Microsoft.Bot.Builder.LanguageGeneration/Expander.cs b/libraries/Microsoft.Bot.Builder.LanguageGeneration/Expander.cs
index 64270bea7..71082d051 100644
--- a/libraries/Microsoft.Bot.Builder.LanguageGeneration/Expander.cs
+++ b/libraries/Microsoft.Bot.Builder.LanguageGeneration/Expander.cs
@@ -19,7 +19,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
     /// <summary>
     /// LG template expander.
     /// </summary>
-    public class Expander : LGFileParserBaseVisitor<List<object>>
+    public class Expander : LGTemplateParserBaseVisitor<List<object>>
     {
         public const string LGType = "lgType";
         public static readonly string RegexString = @"(?<!\\)\${(('(\\('|\\)|[^'])*?')|(""(\\(""|\\)|[^""])*?"")|(`(\\(`|\\)|[^`])*?`)|([^\r\n{}'""`])|({\s*}))+}?";
@@ -30,9 +30,9 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// <summary>
         /// Initializes a new instance of the <see cref="Expander"/> class.
         /// </summary>
-        /// <param name="templates">template list.</param>
+        /// <param name="templates">Template list.</param>
         /// <param name="expressionParser">Given expression parser.</param>
-        /// <param name="strictMode">strict mode. If strictMode == true, exception in expression would throw outside.</param>
+        /// <param name="strictMode">Strict mode. If strictMode == true, exception in expression would throw outside.</param>
         public Expander(List<Template> templates, ExpressionParser expressionParser, bool strictMode = false)
         {
             Templates = templates;
@@ -101,26 +101,15 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
 
             // Using a stack to track the evaluation trace
             evaluationTargetStack.Push(new EvaluationTarget(templateName, scope));
-            var result = Visit(TemplateMap[templateName].ParseTree);
+            var result = Visit(TemplateMap[templateName].TemplateBodyParseTree);
             evaluationTargetStack.Pop();
 
             return result;
         }
 
-        public override List<object> VisitTemplateDefinition([NotNull] LGFileParser.TemplateDefinitionContext context)
-        {
-            var templateNameContext = context.templateNameLine();
-            if (templateNameContext.templateName().GetText().Equals(CurrentTarget().TemplateName))
-            {
-                return Visit(context.templateBody());
-            }
+        public override List<object> VisitNormalBody([NotNull] LGTemplateParser.NormalBodyContext context) => Visit(context.normalTemplateBody());
 
-            return null;
-        }
-
-        public override List<object> VisitNormalBody([NotNull] LGFileParser.NormalBodyContext context) => Visit(context.normalTemplateBody());
-
-        public override List<object> VisitNormalTemplateBody([NotNull] LGFileParser.NormalTemplateBodyContext context)
+        public override List<object> VisitNormalTemplateBody([NotNull] LGTemplateParser.NormalTemplateBodyContext context)
         {
             var normalTemplateStrs = context.templateString();
             var result = new List<object>();
@@ -133,7 +122,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
             return result;
         }
 
-        public override List<object> VisitIfElseBody([NotNull] LGFileParser.IfElseBodyContext context)
+        public override List<object> VisitIfElseBody([NotNull] LGTemplateParser.IfElseBodyContext context)
         {
             var ifRules = context.ifElseTemplateBody().ifConditionRule();
             foreach (var ifRule in ifRules)
@@ -147,7 +136,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
             return null;
         }
 
-        public override List<object> VisitSwitchCaseBody([NotNull] LGFileParser.SwitchCaseBodyContext context)
+        public override List<object> VisitSwitchCaseBody([NotNull] LGTemplateParser.SwitchCaseBodyContext context)
         {
             var switchCaseNodes = context.switchCaseTemplateBody().switchCaseRule();
             var length = switchCaseNodes.Length;
@@ -190,7 +179,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
             return null;
         }
 
-        public override List<object> VisitStructuredBody([NotNull] LGFileParser.StructuredBodyContext context)
+        public override List<object> VisitStructuredBody([NotNull] LGTemplateParser.StructuredBodyContext context)
         {
             var templateRefValues = new Dictionary<string, List<object>>();
             var stb = context.structuredTemplateBody();
@@ -278,7 +267,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
             return finalResult;
         }
 
-        public override List<object> VisitNormalTemplateString([NotNull] LGFileParser.NormalTemplateStringContext context)
+        public override List<object> VisitNormalTemplateString([NotNull] LGTemplateParser.NormalTemplateStringContext context)
         {
             var prefixErrorMsg = context.GetPrefixErrorMessage();
             var result = new List<string>() { string.Empty };
@@ -286,14 +275,14 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
             {
                 switch (node.Symbol.Type)
                 {
-                    case LGFileParser.DASH:
-                    case LGFileParser.MULTILINE_PREFIX:
-                    case LGFileParser.MULTILINE_SUFFIX:
+                    case LGTemplateParser.DASH:
+                    case LGTemplateParser.MULTILINE_PREFIX:
+                    case LGTemplateParser.MULTILINE_SUFFIX:
                         break;
-                    case LGFileParser.ESCAPE_CHARACTER:
+                    case LGTemplateParser.ESCAPE_CHARACTER:
                         result = StringListConcat(result, new List<string>() { node.GetText().Escape() });
                         break;
-                    case LGFileParser.EXPRESSION:
+                    case LGTemplateParser.EXPRESSION:
                         result = StringListConcat(result, EvalExpression(node.GetText(), context, prefixErrorMsg));
                         break;
                     default:
@@ -320,7 +309,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
             return newScope;
         }
 
-        private bool EvalCondition(LGFileParser.IfConditionContext condition)
+        private bool EvalCondition(LGTemplateParser.IfConditionContext condition)
         {
             var expression = condition.EXPRESSION(0);
             if (expression == null || // no expression means it's else
@@ -332,7 +321,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
             return false;
         }
 
-        private List<List<object>> VisitStructureValue(LGFileParser.KeyValueStructureLineContext context)
+        private List<List<object>> VisitStructureValue(LGTemplateParser.KeyValueStructureLineContext context)
         {
             var values = context.keyValueStructureValue();
 
@@ -350,10 +339,10 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
                     {
                         switch (node.Symbol.Type)
                         {
-                            case LGFileParser.ESCAPE_CHARACTER_IN_STRUCTURE_BODY:
+                            case LGTemplateParser.ESCAPE_CHARACTER_IN_STRUCTURE_BODY:
                                 itemStringResult = StringListConcat(itemStringResult, new List<string>() { node.GetText().Replace(@"\|", "|").Escape() });
                                 break;
-                            case LGFileParser.EXPRESSION_IN_STRUCTURE_BODY:
+                            case LGTemplateParser.EXPRESSION_IN_STRUCTURE_BODY:
                                 var errorPrefix = "Property '" + context.STRUCTURE_IDENTIFIER().GetText() + "':";
                                 itemStringResult = StringListConcat(itemStringResult, EvalExpression(node.GetText(), item, errorPrefix));
                                 break;
@@ -556,7 +545,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
 
             if ((children0.ReturnType & ReturnType.Object) == 0 && (children0.ReturnType & ReturnType.String) == 0)
             {
-                throw new Exception(TemplateErrors.ErrorTemplateNameformat(children0.ToString()));
+                throw new Exception(TemplateErrors.InvalidTemplateName);
             }
 
             // Validate more if the name is string constant
@@ -658,7 +647,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
             else
             {
                 var template = TemplateMap[CurrentTarget().TemplateName];
-                var sourcePath = template.Source.NormalizePath();
+                var sourcePath = template.SourceRange.Source.NormalizePath();
                 var baseFolder = Environment.CurrentDirectory;
                 if (Path.IsPathRooted(sourcePath))
                 {
diff --git a/libraries/Microsoft.Bot.Builder.LanguageGeneration/Extensions.cs b/libraries/Microsoft.Bot.Builder.LanguageGeneration/Extensions.cs
index 5f8a73dd6..b8ebf7914 100644
--- a/libraries/Microsoft.Bot.Builder.LanguageGeneration/Extensions.cs
+++ b/libraries/Microsoft.Bot.Builder.LanguageGeneration/Extensions.cs
@@ -4,6 +4,7 @@
 using System.Collections.Generic;
 using System.Runtime.InteropServices;
 using System.Text.RegularExpressions;
+using Antlr4.Runtime;
 using Antlr4.Runtime.Tree;
 
 namespace Microsoft.Bot.Builder.LanguageGeneration
@@ -19,9 +20,9 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// If a value is pure Expression.
         /// </summary>
         /// <param name="context">Key value structure value context.</param>
-        /// <param name="expression">string expression.</param>
-        /// <returns>is pure expression or not.</returns>
-        public static bool IsPureExpression(this LGFileParser.KeyValueStructureValueContext context, out string expression)
+        /// <param name="expression">String expression.</param>
+        /// <returns>Is pure expression or not.</returns>
+        public static bool IsPureExpression(this LGTemplateParser.KeyValueStructureValueContext context, out string expression)
         {
             expression = context.GetText();
 
@@ -30,9 +31,9 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
             {
                 switch (node.Symbol.Type)
                 {
-                    case LGFileParser.ESCAPE_CHARACTER_IN_STRUCTURE_BODY:
+                    case LGTemplateParser.ESCAPE_CHARACTER_IN_STRUCTURE_BODY:
                         return false;
-                    case LGFileParser.EXPRESSION_IN_STRUCTURE_BODY:
+                    case LGTemplateParser.EXPRESSION_IN_STRUCTURE_BODY:
                         if (hasExpression)
                         {
                             return false;
@@ -57,8 +58,8 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// <summary>
         /// Escape \ from text.
         /// </summary>
-        /// <param name="text">input text.</param>
-        /// <returns>escaped text.</returns>
+        /// <param name="text">Input text.</param>
+        /// <returns>Escaped text.</returns>
         public static string Escape(this string text)
         {
             if (text == null)
@@ -88,8 +89,8 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// <summary>
         /// trim expression. ${abc} => abc,  ${a == {}} => a == {}.
         /// </summary>
-        /// <param name="expression">input expression string.</param>
-        /// <returns>pure expression string.</returns>
+        /// <param name="expression">Input expression string.</param>
+        /// <returns>Pure expression string.</returns>
         public static string TrimExpression(this string expression)
         {
             var result = expression.Trim().TrimStart('$').Trim();
@@ -110,8 +111,8 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// This method treats / and \ both as separators regardless of OS, for Windows that means / -> \ and for Linux/Mac \ -> /.
         /// This allows author to use ../foo.lg or ..\foo.lg as equivalents for importing.
         /// </remarks>
-        /// <param name="ambigiousPath">authoredPath.</param>
-        /// <returns>path expressed as OS path.</returns>
+        /// <param name="ambigiousPath">Authored path.</param>
+        /// <returns>Path expressed as OS path.</returns>
         public static string NormalizePath(this string ambigiousPath)
         {
             if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
@@ -129,18 +130,18 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// <summary>
         /// Get prefix error message from normal template sting context.
         /// </summary>
-        /// <param name="context">normal template sting context.</param>
-        /// <returns>prefix error message.</returns>
-        public static string GetPrefixErrorMessage(this LGFileParser.NormalTemplateStringContext context)
+        /// <param name="context">Normal template sting context.</param>
+        /// <returns>Prefix error message.</returns>
+        public static string GetPrefixErrorMessage(this LGTemplateParser.NormalTemplateStringContext context)
         {
             var errorPrefix = string.Empty;
-            if (context.Parent?.Parent?.Parent is LGFileParser.IfConditionRuleContext conditionContext)
+            if (context.Parent?.Parent?.Parent is LGTemplateParser.IfConditionRuleContext conditionContext)
             {
                 errorPrefix = "Condition '" + conditionContext.ifCondition()?.EXPRESSION(0)?.GetText() + "': ";
             }
             else
             {
-                if (context.Parent?.Parent?.Parent is LGFileParser.SwitchCaseRuleContext switchCaseContext)
+                if (context.Parent?.Parent?.Parent is LGTemplateParser.SwitchCaseRuleContext switchCaseContext)
                 {
                     var state = switchCaseContext.switchCaseStat();
                     if (state?.DEFAULT() != null)
@@ -160,5 +161,23 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
 
             return errorPrefix;
         }
+
+        /// <summary>
+        /// Convert antlr parser into Range.
+        /// </summary>
+        /// <param name="context">Antlr parse context.</param>
+        /// <param name="lineOffset">Line offset.</param>
+        /// <returns>Range object.</returns>
+        public static Range ConvertToRange(this ParserRuleContext context, int lineOffset = 0)
+        {
+            if (context == null)
+            {
+                return Range.DefaultRange;
+            }
+
+            var startPosition = new Position(lineOffset + context.Start.Line, context.Start.Column);
+            var stopPosition = new Position(lineOffset + context.Stop.Line, context.Stop.Column + context.Stop.Text.Length);
+            return new Range(startPosition, stopPosition);
+        }
     }
 }
diff --git a/libraries/Microsoft.Bot.Builder.LanguageGeneration/LGFileLexer.g4 b/libraries/Microsoft.Bot.Builder.LanguageGeneration/LGFileLexer.g4
index c445c7178..0170eca09 100644
--- a/libraries/Microsoft.Bot.Builder.LanguageGeneration/LGFileLexer.g4
+++ b/libraries/Microsoft.Bot.Builder.LanguageGeneration/LGFileLexer.g4
@@ -1,259 +1,24 @@
 lexer grammar LGFileLexer;
 
-// From a multiple-lanague perpective, it's not recommended to use members, predicates and actions to 
-// put target-language-specific code in lexer rules 
-
-// the reason we use it here is that
-// 1. it greatly simplify the lexer rules, can avoid unnecessary lexer modes 
-// 2. it helps us to output token more precisely
-//    (for example, 'CASE:' not followed right after '-' will not be treated as a CASE token)
-// 3. we only use very basic boolen variables, and basic predidates
-//    so it would be very little effort to translate to other languages
-
 @parser::header {#pragma warning disable 3021} // Disable StyleCop warning CS3021 re CLSCompliant attribute in generated files.
 @lexer::header {#pragma warning disable 3021} // Disable StyleCop warning CS3021 re CLSCompliant attribute in generated files.
 
 @lexer::members {
-  bool ignoreWS = true; // usually we ignore whitespace, but inside template, whitespace is significant
-  bool inTemplate = false; // whether we are in the template
-  bool beginOfTemplateBody = false; // whether we are at the begining of template body
-  bool inMultiline = false; // whether we are in multiline
-  bool beginOfTemplateLine = false;// weather we are at the begining of template string
-  bool inStructuredValue = false; // weather we are in the structure value
-  bool beginOfStructureProperty = false; // weather we are at the begining of structure property
+  bool startTemplate = false;
 }
 
-// fragments
-fragment A: 'a' | 'A';
-fragment C: 'c' | 'C';
-fragment D: 'd' | 'D';
-fragment E: 'e' | 'E';
-fragment F: 'f' | 'F';
-fragment H: 'h' | 'H';
-fragment I: 'i' | 'I';
-fragment L: 'l' | 'L';
-fragment S: 's' | 'S';
-fragment T: 't' | 'T';
-fragment U: 'u' | 'U';
-fragment W: 'w' | 'W';
-
-fragment LETTER: 'a'..'z' | 'A'..'Z';
-
-fragment NUMBER: '0'..'9';
-
 fragment WHITESPACE : ' '|'\t'|'\ufeff'|'\u00a0';
 
-fragment STRING_LITERAL : ('\'' (('\\'('\''|'\\'))|(~'\''))*? '\'') | ('"' (('\\'('"'|'\\'))|(~'"'))*? '"');
+NEWLINE : '\r'? '\n';
 
-fragment STRING_INTERPOLATION : '`' (('\\'('`'|'\\'))|(~'`'))*? '`';
+OPTION : WHITESPACE* '>' WHITESPACE* '!#' ~('\r'|'\n')+ { !startTemplate }?;
 
-fragment ESCAPE_CHARACTER_FRAGMENT : '\\' ~[\r\n]?;
+COMMENT : WHITESPACE* '>' ~('\r'|'\n')* { !startTemplate }?;
 
+IMPORT : WHITESPACE* '[' ~[\r\n[\]]*? ']' '(' ~[\r\n()]*? ')' WHITESPACE* { !startTemplate }?;
 
-// top level elements
-OPTIONS
-  : '>' WHITESPACE* '!#' ~('\r'|'\n')+
-  ;
+TEMPLATE_NAME_LINE : WHITESPACE* '#' ~('\r'|'\n')* { startTemplate = true; };
 
-COMMENTS
-  : '>' ~('\r'|'\n')* -> skip
-  ;
-
-WS
-  : WHITESPACE+ -> skip
-  ;
-
-NEWLINE
-  : '\r'? '\n' -> skip
-  ;
-
-HASH
-  : '#' { inTemplate = true; beginOfTemplateBody = false; } -> pushMode(TEMPLATE_NAME_MODE)
-  ;
-
-DASH
-  : '-' { inTemplate }? { beginOfTemplateLine = true; beginOfTemplateBody = false; } -> pushMode(TEMPLATE_BODY_MODE)
-  ;
-
-OBJECT_DEFINITION
-  : '{' ((WHITESPACE) | ((IDENTIFIER | STRING_LITERAL) ':' ( STRING_LITERAL | ~[{}\r\n'"`] | OBJECT_DEFINITION)+))* '}'
-  ;
-
-EXPRESSION_FRAGMENT
-  : '$' '{' (STRING_LITERAL | STRING_INTERPOLATION | OBJECT_DEFINITION | ~[}'"`])+ '}'?
-  ;
-
-LEFT_SQUARE_BRACKET
-  : '[' { inTemplate && beginOfTemplateBody }? -> pushMode(STRUCTURE_NAME_MODE)
-  ;
-
-IMPORT
-  : '[' ~[\r\n[\]]*? ']' '(' ~[\r\n()]*? ')' { inTemplate = false;}
-  ;
-
-INVALID_TOKEN
-  : . { inTemplate = false; beginOfTemplateBody = false; }
-  ;
-
-mode TEMPLATE_NAME_MODE;
-
-WS_IN_NAME
-  : WHITESPACE+ -> skip
-  ;
-
-NEWLINE_IN_NAME
-  : '\r'? '\n' { beginOfTemplateBody = true;}-> skip, popMode
-  ;
-
-IDENTIFIER
-  : (LETTER | NUMBER | '_') (LETTER | NUMBER | '_')*
-  ;
-
-DOT
-  : '.'
-  ;
-
-OPEN_PARENTHESIS
-  : '('
-  ;
-
-CLOSE_PARENTHESIS
-  : ')'
-  ;
-
-COMMA
-  : ','
-  ;
-
-TEXT_IN_NAME
-  : ~[\r\n]+?
-  ;
-
-mode TEMPLATE_BODY_MODE;
-
-WS_IN_BODY
-  : WHITESPACE+  {ignoreWS}? -> skip
-  ;
-
-MULTILINE_PREFIX
-  : '```' { !inMultiline  && beginOfTemplateLine }? { inMultiline = true; beginOfTemplateLine = false;}-> pushMode(MULTILINE_MODE)
-  ;
-
-NEWLINE_IN_BODY
-  : '\r'? '\n' { ignoreWS = true;} -> skip, popMode
-  ;
-
-IF
-  : I F WHITESPACE* ':'  {beginOfTemplateLine}? { ignoreWS = true; beginOfTemplateLine = false;}
-  ;
-
-ELSEIF
-  : E L S E WHITESPACE* I F WHITESPACE* ':' {beginOfTemplateLine}? { ignoreWS = true; beginOfTemplateLine = false;}
-  ;
-
-ELSE
-  : E L S E WHITESPACE* ':' {beginOfTemplateLine}? { ignoreWS = true; beginOfTemplateLine = false;}
-  ;
-
-SWITCH
-  : S W I T C H WHITESPACE* ':' {beginOfTemplateLine}? { ignoreWS = true; beginOfTemplateLine = false;}
-  ;
-
-CASE
-  : C A S E WHITESPACE* ':' {beginOfTemplateLine}? { ignoreWS = true; beginOfTemplateLine = false;}
-  ;
-
-DEFAULT
-  : D E F A U L T WHITESPACE* ':' {beginOfTemplateLine}? { ignoreWS = true; beginOfTemplateLine = false;}
-  ;
-
-ESCAPE_CHARACTER
-  : ESCAPE_CHARACTER_FRAGMENT  { ignoreWS = false; beginOfTemplateLine = false;}
-  ;
-
-EXPRESSION
-  : EXPRESSION_FRAGMENT  { ignoreWS = false; beginOfTemplateLine = false;}
-  ;
-
-TEXT
-  : ~[\r\n]+?  { ignoreWS = false; beginOfTemplateLine = false;}
-  ;
-
-mode MULTILINE_MODE;
-
-MULTILINE_SUFFIX
-  : '```' { inMultiline = false; } -> popMode
-  ;
-
-MULTILINE_ESCAPE_CHARACTER
-  : ESCAPE_CHARACTER_FRAGMENT -> type(ESCAPE_CHARACTER)
-  ;
-
-MULTILINE_EXPRESSION
-  : EXPRESSION_FRAGMENT -> type(EXPRESSION)
-  ;
-
-MULTILINE_TEXT
-  : (('\r'? '\n') | ~[\r\n])+? -> type(TEXT)
-  ;
-
-mode STRUCTURE_NAME_MODE;
-
-WS_IN_STRUCTURE_NAME
-  : WHITESPACE+ -> skip
-  ;
-
-NEWLINE_IN_STRUCTURE_NAME
-  : '\r'? '\n' { ignoreWS = true;} {beginOfStructureProperty = true;}-> skip, pushMode(STRUCTURE_BODY_MODE)
-  ;
-
-STRUCTURE_NAME
-  : (LETTER | NUMBER | '_') (LETTER | NUMBER | '-' | '_' | '.')*
-  ;
-
-TEXT_IN_STRUCTURE_NAME
-  : ~[\r\n]+?
-  ;
-
-mode STRUCTURE_BODY_MODE;
-
-STRUCTURED_COMMENTS
-  : '>' ~[\r\n]* '\r'?'\n' { !inStructuredValue && beginOfStructureProperty}? -> skip
-  ;
-
-WS_IN_STRUCTURE_BODY
-  : WHITESPACE+ {ignoreWS}? -> skip
-  ;
-
-STRUCTURED_NEWLINE
-  : '\r'? '\n' { ignoreWS = true; inStructuredValue = false; beginOfStructureProperty = true;}
-  ;
-
-STRUCTURED_BODY_END
-  : ']' {!inStructuredValue}? { inTemplate = false; beginOfTemplateBody = false;} -> popMode, popMode
-  ;
-
-STRUCTURE_IDENTIFIER
-  : (LETTER | NUMBER | '_') (LETTER | NUMBER | '-' | '_' | '.')* { !inStructuredValue && beginOfStructureProperty}? {beginOfStructureProperty = false;}
-  ;
-
-STRUCTURE_EQUALS
-  : '=' {!inStructuredValue}? {inStructuredValue = true;} 
-  ;
-
-STRUCTURE_OR_MARK
-  : '|' { ignoreWS = true; }
-  ;
-
-ESCAPE_CHARACTER_IN_STRUCTURE_BODY
-  : ESCAPE_CHARACTER_FRAGMENT { ignoreWS = false; }
-  ;
-
-EXPRESSION_IN_STRUCTURE_BODY
-  : EXPRESSION_FRAGMENT { ignoreWS = false; }
-  ;
-
-TEXT_IN_STRUCTURE_BODY
-  : ~[\r\n]+?  { ignoreWS = false; beginOfStructureProperty = false;}
-  ;
+TEMPLATE_BODY_LINE : ~('\r'|'\n')+ { startTemplate }?;
 
+INVALID_LINE :  ~('\r'|'\n')+ { !startTemplate }?;
\ No newline at end of file
diff --git a/libraries/Microsoft.Bot.Builder.LanguageGeneration/LGFileParser.g4 b/libraries/Microsoft.Bot.Builder.LanguageGeneration/LGFileParser.g4
index 7e1308c4b..4f9c77ca2 100644
--- a/libraries/Microsoft.Bot.Builder.LanguageGeneration/LGFileParser.g4
+++ b/libraries/Microsoft.Bot.Builder.LanguageGeneration/LGFileParser.g4
@@ -6,130 +6,47 @@ parser grammar LGFileParser;
 options { tokenVocab=LGFileLexer; }
 
 file
-	: paragraph+? EOF
-	;
+    : paragraph+? EOF
+    ;
 
 paragraph
     : templateDefinition
     | importDefinition
-    | optionsDefinition
+    | optionDefinition
+    | errorDefinition
+    | commentDefinition
+    | NEWLINE
     | EOF
-    | errorTemplate
     ;
 
-errorTemplate
-    : INVALID_TOKEN+
-    ;
-
-templateDefinition
-	: templateNameLine templateBody?
-	;
-
-templateNameLine
-	: HASH ((templateName parameters?) | errorTemplateName)
-	;
-
-errorTemplateName
-    : (IDENTIFIER|TEXT_IN_NAME|OPEN_PARENTHESIS|COMMA|CLOSE_PARENTHESIS|DOT)*
-    ;
-
-templateName
-    : IDENTIFIER (DOT IDENTIFIER)*
-    ;
-
-parameters
-    : OPEN_PARENTHESIS (IDENTIFIER (COMMA IDENTIFIER)*)? CLOSE_PARENTHESIS
-    ;
-
-templateBody
-    : normalTemplateBody                        #normalBody
-    | ifElseTemplateBody                        #ifElseBody
-    | switchCaseTemplateBody                    #switchCaseBody
-    | structuredTemplateBody                    #structuredBody
-    ;
-
-structuredTemplateBody
-    : structuredBodyNameLine (((structuredBodyContentLine? STRUCTURED_NEWLINE) | errorStructureLine)+)? structuredBodyEndLine?
-    ;
-
-structuredBodyNameLine
-    : LEFT_SQUARE_BRACKET (STRUCTURE_NAME | errorStructuredName)
-    ;
-
-errorStructuredName
-    : (STRUCTURE_NAME|TEXT_IN_STRUCTURE_NAME)*
-    ;
-
-structuredBodyContentLine
-    : keyValueStructureLine
-    | objectStructureLine
-    ;
-
-errorStructureLine
-    : (STRUCTURE_IDENTIFIER|STRUCTURE_EQUALS|STRUCTURE_OR_MARK|TEXT_IN_STRUCTURE_BODY|EXPRESSION_IN_STRUCTURE_BODY|ESCAPE_CHARACTER_IN_STRUCTURE_BODY)+
-    ;
-
-keyValueStructureLine
-    : STRUCTURE_IDENTIFIER STRUCTURE_EQUALS keyValueStructureValue (STRUCTURE_OR_MARK keyValueStructureValue)*
-    ;
-
-keyValueStructureValue
-    : (TEXT_IN_STRUCTURE_BODY|EXPRESSION_IN_STRUCTURE_BODY|ESCAPE_CHARACTER_IN_STRUCTURE_BODY)+
-    ;
-
-objectStructureLine
-    : EXPRESSION_IN_STRUCTURE_BODY
-    ;
-
-structuredBodyEndLine
-    : STRUCTURED_BODY_END
-    ;
-
-normalTemplateBody
-    : templateString+
-    ;
-
-templateString
-    : normalTemplateString
-    | errorTemplateString
-    ;
-
-normalTemplateString
-    : DASH MULTILINE_PREFIX? (TEXT|EXPRESSION|ESCAPE_CHARACTER)* MULTILINE_SUFFIX?
-    ;
-
-errorTemplateString
-	: INVALID_TOKEN+
-	;
-
-ifElseTemplateBody
-    : ifConditionRule+
-    ;
-
-ifConditionRule
-    : ifCondition normalTemplateBody?
-    ;
-
-ifCondition
-    : DASH (IF|ELSE|ELSEIF) (WS|TEXT|EXPRESSION)*
-    ;
-
-switchCaseTemplateBody
-    : switchCaseRule+
-    ;
-
-switchCaseRule
-    : switchCaseStat normalTemplateBody?
-    ;
-
-switchCaseStat
-    : DASH (SWITCH|CASE|DEFAULT) (WS|TEXT|EXPRESSION)*
+commentDefinition
+    : COMMENT NEWLINE?
     ;
 
 importDefinition
-    : IMPORT
+    : IMPORT NEWLINE?
     ;
 
-optionsDefinition
-    : OPTIONS
+optionDefinition
+    : OPTION NEWLINE?
+    ;
+
+errorDefinition
+    : INVALID_LINE NEWLINE?
+    ;
+
+templateDefinition
+    : templateNameLine templateBody
+    ;
+
+templateNameLine
+    : TEMPLATE_NAME_LINE NEWLINE?
+    ;
+
+templateBody
+    : templateBodyLine*
+    ;
+
+templateBodyLine
+    : (TEMPLATE_BODY_LINE NEWLINE?) | NEWLINE
     ;
\ No newline at end of file
diff --git a/libraries/Microsoft.Bot.Builder.LanguageGeneration/LGTemplateLexer.g4 b/libraries/Microsoft.Bot.Builder.LanguageGeneration/LGTemplateLexer.g4
new file mode 100644
index 000000000..6647b2fa3
--- /dev/null
+++ b/libraries/Microsoft.Bot.Builder.LanguageGeneration/LGTemplateLexer.g4
@@ -0,0 +1,202 @@
+lexer grammar LGTemplateLexer;
+
+@parser::header {#pragma warning disable 3021} // Disable StyleCop warning CS3021 re CLSCompliant attribute in generated files.
+@lexer::header {#pragma warning disable 3021} // Disable StyleCop warning CS3021 re CLSCompliant attribute in generated files.
+
+@lexer::members {
+  bool ignoreWS = true; // usually we ignore whitespace, but inside template, whitespace is significant
+  bool beginOfTemplateBody = true; // whether we are at the begining of template body
+  bool inMultiline = false; // whether we are in multiline
+  bool beginOfTemplateLine = false;// weather we are at the begining of template string
+  bool inStructuredValue = false; // weather we are in the structure value
+  bool beginOfStructureProperty = false; // weather we are at the begining of structure property
+}
+
+// fragments
+fragment A: 'a' | 'A';
+fragment C: 'c' | 'C';
+fragment D: 'd' | 'D';
+fragment E: 'e' | 'E';
+fragment F: 'f' | 'F';
+fragment H: 'h' | 'H';
+fragment I: 'i' | 'I';
+fragment L: 'l' | 'L';
+fragment S: 's' | 'S';
+fragment T: 't' | 'T';
+fragment U: 'u' | 'U';
+fragment W: 'w' | 'W';
+
+fragment LETTER: 'a'..'z' | 'A'..'Z';
+
+fragment NUMBER: '0'..'9';
+
+fragment WHITESPACE : ' '|'\t'|'\ufeff'|'\u00a0';
+
+fragment STRING_LITERAL : ('\'' (('\\'('\''|'\\'))|(~'\''))*? '\'') | ('"' (('\\'('"'|'\\'))|(~'"'))*? '"');
+
+fragment STRING_INTERPOLATION : '`' (('\\'('`'|'\\'))|(~'`'))*? '`';
+
+fragment ESCAPE_CHARACTER_FRAGMENT : '\\' ~[\r\n]?;
+
+fragment IDENTIFIER : (LETTER | NUMBER | '_') (LETTER | NUMBER | '_')*;
+
+WS
+  : WHITESPACE+ -> skip
+  ;
+
+NEWLINE
+  : '\r'? '\n' -> skip
+  ;
+
+COMMENTS
+  : '>' ~('\r'|'\n')* -> skip
+  ;
+
+DASH
+  : '-' { beginOfTemplateLine = true; beginOfTemplateBody = false; } -> pushMode(NORMAL_TEMPLATE_BODY_MODE)
+  ;
+
+OBJECT_DEFINITION
+  : '{' ((WHITESPACE) | ((IDENTIFIER | STRING_LITERAL) ':' ( STRING_LITERAL | ~[{}\r\n'"`] | OBJECT_DEFINITION)+))* '}'
+  ;
+  
+EXPRESSION_FRAGMENT
+  : '$' '{' (STRING_LITERAL | STRING_INTERPOLATION | OBJECT_DEFINITION | ~[}'"`])+ '}'?
+  ;
+
+LEFT_SQUARE_BRACKET
+  : '[' { beginOfTemplateBody }? {beginOfTemplateBody = false;} -> pushMode(STRUCTURE_NAME_MODE)
+  ;
+
+INVALID_TOKEN
+  : . { beginOfTemplateBody = false; }
+  ;
+
+mode NORMAL_TEMPLATE_BODY_MODE;
+
+WS_IN_BODY
+  : WHITESPACE+  {ignoreWS}? -> skip
+  ;
+
+MULTILINE_PREFIX
+  : '```' { !inMultiline  && beginOfTemplateLine }? { inMultiline = true; beginOfTemplateLine = false;}-> pushMode(MULTILINE_MODE)
+  ;
+
+NEWLINE_IN_BODY
+  : '\r'? '\n' { ignoreWS = true;} -> skip, popMode
+  ;
+
+IF
+  : I F WHITESPACE* ':'  {beginOfTemplateLine}? { ignoreWS = true; beginOfTemplateLine = false;}
+  ;
+
+ELSEIF
+  : E L S E WHITESPACE* I F WHITESPACE* ':' {beginOfTemplateLine}? { ignoreWS = true; beginOfTemplateLine = false;}
+  ;
+
+ELSE
+  : E L S E WHITESPACE* ':' {beginOfTemplateLine}? { ignoreWS = true; beginOfTemplateLine = false;}
+  ;
+
+SWITCH
+  : S W I T C H WHITESPACE* ':' {beginOfTemplateLine}? { ignoreWS = true; beginOfTemplateLine = false;}
+  ;
+
+CASE
+  : C A S E WHITESPACE* ':' {beginOfTemplateLine}? { ignoreWS = true; beginOfTemplateLine = false;}
+  ;
+
+DEFAULT
+  : D E F A U L T WHITESPACE* ':' {beginOfTemplateLine}? { ignoreWS = true; beginOfTemplateLine = false;}
+  ;
+
+ESCAPE_CHARACTER
+  : ESCAPE_CHARACTER_FRAGMENT  { ignoreWS = false; beginOfTemplateLine = false;}
+  ;
+
+EXPRESSION
+  : EXPRESSION_FRAGMENT  { ignoreWS = false; beginOfTemplateLine = false;}
+  ;
+
+TEXT
+  : ~[\r\n]+?  { ignoreWS = false; beginOfTemplateLine = false;}
+  ;
+
+mode MULTILINE_MODE;
+
+MULTILINE_SUFFIX
+  : '```' { inMultiline = false; } -> popMode
+  ;
+
+MULTILINE_ESCAPE_CHARACTER
+  : ESCAPE_CHARACTER_FRAGMENT -> type(ESCAPE_CHARACTER)
+  ;
+
+MULTILINE_EXPRESSION
+  : EXPRESSION_FRAGMENT -> type(EXPRESSION)
+  ;
+
+MULTILINE_TEXT
+  : (('\r'? '\n') | ~[\r\n])+? -> type(TEXT)
+  ;
+
+mode STRUCTURE_NAME_MODE;
+
+WS_IN_STRUCTURE_NAME
+  : WHITESPACE+ -> skip
+  ;
+
+NEWLINE_IN_STRUCTURE_NAME
+  : '\r'? '\n' { ignoreWS = true;} {beginOfStructureProperty = true;}-> skip, pushMode(STRUCTURE_BODY_MODE)
+  ;
+
+STRUCTURE_NAME
+  : (LETTER | NUMBER | '_') (LETTER | NUMBER | '-' | '_' | '.')*
+  ;
+
+TEXT_IN_STRUCTURE_NAME
+  : ~[\r\n]+?
+  ;
+
+mode STRUCTURE_BODY_MODE;
+
+STRUCTURED_COMMENTS
+  : '>' ~[\r\n]* '\r'?'\n' { !inStructuredValue && beginOfStructureProperty}? -> skip
+  ;
+
+WS_IN_STRUCTURE_BODY
+  : WHITESPACE+ {ignoreWS}? -> skip
+  ;
+
+STRUCTURED_NEWLINE
+  : '\r'? '\n' { ignoreWS = true; inStructuredValue = false; beginOfStructureProperty = true;}
+  ;
+
+STRUCTURED_BODY_END
+  : ']' {!inStructuredValue}? -> popMode, popMode
+  ;
+
+STRUCTURE_IDENTIFIER
+  : (LETTER | NUMBER | '_') (LETTER | NUMBER | '-' | '_' | '.')* { !inStructuredValue && beginOfStructureProperty}? {beginOfStructureProperty = false;}
+  ;
+
+STRUCTURE_EQUALS
+  : '=' {!inStructuredValue}? {inStructuredValue = true;} 
+  ;
+
+STRUCTURE_OR_MARK
+  : '|' { ignoreWS = true; }
+  ;
+
+ESCAPE_CHARACTER_IN_STRUCTURE_BODY
+  : ESCAPE_CHARACTER_FRAGMENT { ignoreWS = false; }
+  ;
+
+EXPRESSION_IN_STRUCTURE_BODY
+  : EXPRESSION_FRAGMENT { ignoreWS = false; }
+  ;
+
+TEXT_IN_STRUCTURE_BODY
+  : ~[\r\n]+?  { ignoreWS = false; beginOfStructureProperty = false;}
+  ;
+
diff --git a/libraries/Microsoft.Bot.Builder.LanguageGeneration/LGTemplateParser.g4 b/libraries/Microsoft.Bot.Builder.LanguageGeneration/LGTemplateParser.g4
new file mode 100644
index 000000000..dd41badd3
--- /dev/null
+++ b/libraries/Microsoft.Bot.Builder.LanguageGeneration/LGTemplateParser.g4
@@ -0,0 +1,93 @@
+parser grammar LGTemplateParser;
+
+@parser::header {#pragma warning disable 3021} // Disable StyleCop warning CS3021 re CLSCompliant attribute in generated files.
+@lexer::header {#pragma warning disable 3021} // Disable StyleCop warning CS3021 re CLSCompliant attribute in generated files.
+
+options { tokenVocab=LGTemplateLexer; }
+
+context: body EOF;
+
+body
+    : normalTemplateBody                        #normalBody
+    | ifElseTemplateBody                        #ifElseBody
+    | switchCaseTemplateBody                    #switchCaseBody
+    | structuredTemplateBody                    #structuredBody
+    ;
+
+structuredTemplateBody
+    : structuredBodyNameLine (((structuredBodyContentLine? STRUCTURED_NEWLINE) | errorStructureLine)+)? structuredBodyEndLine?
+    ;
+
+structuredBodyNameLine
+    : LEFT_SQUARE_BRACKET (STRUCTURE_NAME | errorStructuredName)
+    ;
+
+errorStructuredName
+    : (STRUCTURE_NAME|TEXT_IN_STRUCTURE_NAME)*
+    ;
+
+structuredBodyContentLine
+    : keyValueStructureLine
+    | objectStructureLine
+    ;
+
+errorStructureLine
+    : (STRUCTURE_IDENTIFIER|STRUCTURE_EQUALS|STRUCTURE_OR_MARK|TEXT_IN_STRUCTURE_BODY|EXPRESSION_IN_STRUCTURE_BODY|ESCAPE_CHARACTER_IN_STRUCTURE_BODY)+
+    ;
+
+keyValueStructureLine
+    : STRUCTURE_IDENTIFIER STRUCTURE_EQUALS keyValueStructureValue (STRUCTURE_OR_MARK keyValueStructureValue)*
+    ;
+
+keyValueStructureValue
+    : (TEXT_IN_STRUCTURE_BODY|EXPRESSION_IN_STRUCTURE_BODY|ESCAPE_CHARACTER_IN_STRUCTURE_BODY)+
+    ;
+
+objectStructureLine
+    : EXPRESSION_IN_STRUCTURE_BODY
+    ;
+
+structuredBodyEndLine
+    : STRUCTURED_BODY_END
+    ;
+
+normalTemplateBody
+    : templateString+
+    ;
+
+templateString
+    : normalTemplateString
+    | errorTemplateString
+    ;
+
+normalTemplateString
+    : DASH MULTILINE_PREFIX? (TEXT|EXPRESSION|ESCAPE_CHARACTER)* MULTILINE_SUFFIX?
+    ;
+
+errorTemplateString
+	: INVALID_TOKEN+
+	;
+
+ifElseTemplateBody
+    : ifConditionRule+
+    ;
+
+ifConditionRule
+    : ifCondition normalTemplateBody?
+    ;
+
+ifCondition
+    : DASH (IF|ELSE|ELSEIF) (WS|TEXT|EXPRESSION)*
+    ;
+
+switchCaseTemplateBody
+    : switchCaseRule+
+    ;
+
+switchCaseRule
+    : switchCaseStat normalTemplateBody?
+    ;
+
+switchCaseStat
+    : DASH (SWITCH|CASE|DEFAULT) (WS|TEXT|EXPRESSION)*
+    ;
diff --git a/libraries/Microsoft.Bot.Builder.LanguageGeneration/Range.cs b/libraries/Microsoft.Bot.Builder.LanguageGeneration/Range.cs
index 1cdbda851..c8f06e6a6 100644
--- a/libraries/Microsoft.Bot.Builder.LanguageGeneration/Range.cs
+++ b/libraries/Microsoft.Bot.Builder.LanguageGeneration/Range.cs
@@ -8,12 +8,20 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
     /// </summary>
     public class Range
     {
+        public static readonly Range DefaultRange = new Range(1, 0, 1, 0);
+
         public Range(Position start, Position end)
         {
             Start = start;
             End = end;
         }
 
+        public Range(int startLine, int startChar, int endLine, int endChar)
+        {
+            Start = new Position(startLine, startChar);
+            End = new Position(endLine, endChar);
+        }
+
         /// <summary>
         /// Gets or sets the start position. It is before or equal to <see cref="End"/>.
         /// </summary>
@@ -35,8 +43,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
             var result = Start.ToString();
             if (Start.Line <= End.Line && Start.Character < End.Character)
             {
-                result += " - ";
-                result += End.ToString();
+                result += $" - {End}";
             }
 
             return result;
diff --git a/libraries/Microsoft.Bot.Builder.LanguageGeneration/SourceRange.cs b/libraries/Microsoft.Bot.Builder.LanguageGeneration/SourceRange.cs
new file mode 100644
index 000000000..397528eff
--- /dev/null
+++ b/libraries/Microsoft.Bot.Builder.LanguageGeneration/SourceRange.cs
@@ -0,0 +1,50 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+using Antlr4.Runtime;
+
+namespace Microsoft.Bot.Builder.LanguageGeneration
+{
+    /// <summary>
+    /// Source range of the context. Including parse tree, source id and the context range.
+    /// </summary>
+    public class SourceRange
+    {
+        public SourceRange(ParserRuleContext parseTree, string source = "", int offset = 0)
+        {
+            this.Source = source ?? string.Empty;
+            this.ParseTree = parseTree;
+            this.Range = parseTree.ConvertToRange(offset);
+        }
+
+        public SourceRange(Range range, string source = "")
+        {
+            this.Range = range;
+            this.Source = source ?? string.Empty;
+        }
+
+        /// <summary>
+        /// Gets or sets range of the block.
+        /// </summary>
+        /// <value>
+        /// range of the block.
+        /// </value>
+        public Range Range { get; set; }
+
+        /// <summary>
+        /// Gets or sets code source, used as the lg file path.
+        /// </summary>
+        /// <value>
+        /// Code source, used as the lg file path.
+        /// </value>
+        public string Source { get; set; }
+
+        /// <summary>
+        /// Gets or sets content parse tree form LGFileParser.g4.
+        /// </summary>
+        /// <value>
+        /// Content parse tree form LGFileParser.g4.
+        /// </value>
+        public ParserRuleContext ParseTree { get; set; }
+    }
+}
diff --git a/libraries/Microsoft.Bot.Builder.LanguageGeneration/StaticChecker.cs b/libraries/Microsoft.Bot.Builder.LanguageGeneration/StaticChecker.cs
index 1251805f8..31bf2d1f2 100644
--- a/libraries/Microsoft.Bot.Builder.LanguageGeneration/StaticChecker.cs
+++ b/libraries/Microsoft.Bot.Builder.LanguageGeneration/StaticChecker.cs
@@ -13,22 +13,22 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
     /// <summary>
     /// LG managed code checker.
     /// </summary>
-    internal class StaticChecker : LGFileParserBaseVisitor<List<Diagnostic>>
+    internal class StaticChecker : LGTemplateParserBaseVisitor<List<Diagnostic>>
     {
         private readonly ExpressionParser baseExpressionParser;
         private readonly Templates templates;
-        private IList<string> visitedTemplateNames;
+        private Template currentTemplate;
 
         private IExpressionParser _expressionParser;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="StaticChecker"/> class.
         /// </summary>
-        /// <param name="lg">the lg wihch would be checked.</param>
-        public StaticChecker(Templates lg)
+        /// <param name="templates">The templates wihch would be checked.</param>
+        public StaticChecker(Templates templates)
         {
-            this.templates = lg;
-            baseExpressionParser = lg.ExpressionParser;
+            this.templates = templates;
+            baseExpressionParser = templates.ExpressionParser;
         }
 
         // Create a property because we want this to be lazy loaded
@@ -50,81 +50,48 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// <summary>
         /// Return error messages list.
         /// </summary>
-        /// <returns>report result.</returns>
+        /// <returns>Report result.</returns>
         public List<Diagnostic> Check()
         {
-            visitedTemplateNames = new List<string>();
             var result = new List<Diagnostic>();
 
             if (templates.AllTemplates.Count == 0)
             {
-                result.Add(BuildLGDiagnostic(
-                    TemplateErrors.NoTemplate,
-                    DiagnosticSeverity.Warning,
-                    includeTemplateNameInfo: false));
-
+                var diagnostic = new Diagnostic(Range.DefaultRange, TemplateErrors.NoTemplate, DiagnosticSeverity.Warning, templates.Id);
+                result.Add(diagnostic);
                 return result;
             }
 
-            templates.ToList().ForEach(t =>
+            foreach (var template in templates)
             {
-                result.AddRange(Visit(t.ParseTree));
-            });
+                currentTemplate = template;
+                var templateDiagnostics = new List<Diagnostic>();
 
-            return result;
-        }
-
-        public override List<Diagnostic> VisitTemplateDefinition([NotNull] LGFileParser.TemplateDefinitionContext context)
-        {
-            var result = new List<Diagnostic>();
-            var templateNameLine = context.templateNameLine();
-            var errorTemplateName = templateNameLine.errorTemplateName();
-            if (errorTemplateName != null)
-            {
-                result.Add(BuildLGDiagnostic(TemplateErrors.InvalidTemplateName, context: errorTemplateName, includeTemplateNameInfo: false));
-            }
-            else
-            {
-                var templateName = context.templateNameLine().templateName().GetText();
-
-                if (visitedTemplateNames.Contains(templateName))
+                // checker duplicated in different files
+                foreach (var reference in templates.References)
                 {
-                    result.Add(BuildLGDiagnostic(TemplateErrors.DuplicatedTemplateInSameTemplate(templateName), context: templateNameLine));
-                }
-                else
-                {
-                    visitedTemplateNames.Add(templateName);
-                    foreach (var reference in templates.References)
+                    var sameTemplates = reference.Where(u => u.Name == template.Name);
+                    foreach (var sameTemplate in sameTemplates)
                     {
-                        var sameTemplates = reference.Where(u => u.Name == templateName);
-                        foreach (var sameTemplate in sameTemplates)
-                        {
-                            result.Add(BuildLGDiagnostic(TemplateErrors.DuplicatedTemplateInDiffTemplate(sameTemplate.Name, sameTemplate.Source), context: templateNameLine));
-                        }
-                    }
-
-                    if (result.Count > 0)
-                    {
-                        return result;
-                    }
-                    else
-                    {
-                        if (context.templateBody() == null)
-                        {
-                            result.Add(BuildLGDiagnostic(TemplateErrors.NoTemplateBody(templateName), DiagnosticSeverity.Warning, context.templateNameLine()));
-                        }
-                        else
-                        {
-                            result.AddRange(Visit(context.templateBody()));
-                        }
+                        var startLine = template.SourceRange.Range.Start.Line;
+                        var range = new Range(startLine, 0, startLine, template.Name.Length + 1);
+                        var diagnostic = new Diagnostic(range, TemplateErrors.DuplicatedTemplateInDiffTemplate(sameTemplate.Name, sameTemplate.SourceRange.Source), source: templates.Id);
+                        templateDiagnostics.Add(diagnostic);
                     }
                 }
+
+                if (templateDiagnostics.Count == 0 && template.TemplateBodyParseTree != null)
+                {
+                    templateDiagnostics.AddRange(Visit(template.TemplateBodyParseTree));
+                }
+
+                result.AddRange(templateDiagnostics);
             }
 
             return result;
         }
 
-        public override List<Diagnostic> VisitNormalTemplateBody([NotNull] LGFileParser.NormalTemplateBodyContext context)
+        public override List<Diagnostic> VisitNormalTemplateBody([NotNull] LGTemplateParser.NormalTemplateBodyContext context)
         {
             var result = new List<Diagnostic>();
 
@@ -144,7 +111,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
             return result;
         }
 
-        public override List<Diagnostic> VisitStructuredTemplateBody([NotNull] LGFileParser.StructuredTemplateBodyContext context)
+        public override List<Diagnostic> VisitStructuredTemplateBody([NotNull] LGTemplateParser.StructuredTemplateBodyContext context)
         {
             var result = new List<Diagnostic>();
 
@@ -202,7 +169,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
             return result;
         }
 
-        public override List<Diagnostic> VisitIfElseBody([NotNull] LGFileParser.IfElseBodyContext context)
+        public override List<Diagnostic> VisitIfElseBody([NotNull] LGTemplateParser.IfElseBodyContext context)
         {
             var result = new List<Diagnostic>();
 
@@ -277,7 +244,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
             return result;
         }
 
-        public override List<Diagnostic> VisitSwitchCaseBody([NotNull] LGFileParser.SwitchCaseBodyContext context)
+        public override List<Diagnostic> VisitSwitchCaseBody([NotNull] LGTemplateParser.SwitchCaseBodyContext context)
         {
             var result = new List<Diagnostic>();
             var switchCaseRules = context.switchCaseTemplateBody().switchCaseRule();
@@ -364,7 +331,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
             return result;
         }
 
-        public override List<Diagnostic> VisitNormalTemplateString([NotNull] LGFileParser.NormalTemplateStringContext context)
+        public override List<Diagnostic> VisitNormalTemplateString([NotNull] LGTemplateParser.NormalTemplateStringContext context)
         {
             var prefixErrorMsg = context.GetPrefixErrorMessage();
             var result = new List<Diagnostic>();
@@ -413,23 +380,14 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
             return result;
         }
 
-        /// <summary>
-        /// Build LG diagnostic with ANTLR tree node context.
-        /// </summary>
-        /// <param name="message">error/warning message. <see cref="Diagnostic.Message"/>.</param>
-        /// <param name="severity">diagnostic Severity <see cref="DiagnosticSeverity"/> to get more info.</param>
-        /// <param name="context">the parsed tree node context of the diagnostic.</param>
-        /// <returns>new Diagnostic object.</returns>
         private Diagnostic BuildLGDiagnostic(
             string message,
             DiagnosticSeverity severity = DiagnosticSeverity.Error,
-            ParserRuleContext context = null,
-            bool includeTemplateNameInfo = true)
+            ParserRuleContext context = null)
         {
-            message = visitedTemplateNames.Count > 0 && includeTemplateNameInfo ? $"[{visitedTemplateNames.LastOrDefault()}]" + message : message;
-            var startPosition = context == null ? new Position(0, 0) : new Position(context.Start.Line, context.Start.Column);
-            var stopPosition = context == null ? new Position(0, 0) : new Position(context.Stop.Line, context.Stop.Column + context.Stop.Text.Length);
-            var range = new Range(startPosition, stopPosition);
+            var lineOffset = this.currentTemplate != null ? this.currentTemplate.SourceRange.Range.Start.Line : 0;
+            message = this.currentTemplate != null ? $"[{this.currentTemplate.Name}]" + message : message;
+            var range = context == null ? new Range(1 + lineOffset, 0, 1 + lineOffset, 0) : context.ConvertToRange(lineOffset);
             return new Diagnostic(range, message, severity, templates.Id);
         }
     }
diff --git a/libraries/Microsoft.Bot.Builder.LanguageGeneration/Template.cs b/libraries/Microsoft.Bot.Builder.LanguageGeneration/Template.cs
index 82a247aa5..bdf22f078 100644
--- a/libraries/Microsoft.Bot.Builder.LanguageGeneration/Template.cs
+++ b/libraries/Microsoft.Bot.Builder.LanguageGeneration/Template.cs
@@ -1,10 +1,7 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
-using System;
 using System.Collections.Generic;
-using System.IO;
-using System.Linq;
 
 namespace Microsoft.Bot.Builder.LanguageGeneration
 {
@@ -20,34 +17,45 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// <summary>
         /// Initializes a new instance of the <see cref="Template"/> class.
         /// </summary>
-        /// <param name="parseTree">The parse tree of this template.</param>
-        /// <param name="lgfileContent">lg file content.</param>
-        /// <param name="source">Source of this template.</param>
-        internal Template(LGFileParser.TemplateDefinitionContext parseTree, string lgfileContent, string source = "")
+        /// <param name="templateName">Template name without parameters.</param>
+        /// <param name="parameters">Parameter list.</param>
+        /// <param name="templateBody">Template content.</param>
+        /// <param name="sourceRange">Source range of template.</param>
+        internal Template(
+            string templateName,
+            List<string> parameters,
+            string templateBody,
+            SourceRange sourceRange)
         {
-            ParseTree = parseTree;
-            Source = source;
-
-            Name = ExtractName();
-            Parameters = ExtractParameters();
-            Body = ExtractBody(lgfileContent);
+            this.Name = templateName ?? string.Empty;
+            this.Parameters = parameters ?? new List<string>();
+            this.Body = templateBody ?? string.Empty;
+            this.SourceRange = sourceRange;
         }
 
         /// <summary>
-        /// Gets name of the template, what's followed by '#' in a LG file.
+        /// Gets or sets source range.
         /// </summary>
         /// <value>
-        /// Name of the template, what's followed by '#' in a LG file.
+        /// Start line of the template in LG file.
         /// </value>
-        public string Name { get; }
+        public SourceRange SourceRange { get; set; }
 
         /// <summary>
-        /// Gets parameter list of this template.
+        /// Gets or sets name of the template, which follows '#' in a LG file.
+        /// </summary>
+        /// <value>
+        /// Name of the template, which follows '#' in a LG file.
+        /// </value>
+        public string Name { get; set; }
+
+        /// <summary>
+        /// Gets or sets parameter list of this template.
         /// </summary>
         /// <value>
         /// Parameter list of this template.
         /// </value>
-        public List<string> Parameters { get; }
+        public List<string> Parameters { get; set; }
 
         /// <summary>
         /// Gets or sets text format of Body of this template. All content except Name and Parameters.
@@ -58,102 +66,13 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         public string Body { get; set; }
 
         /// <summary>
-        /// Gets source of this template, source file path if it's from a certain file.
-        /// </summary>
-        /// <value>
-        /// Source of this template, source file path if it's from a certain file.
-        /// </value>
-        public string Source { get; }
-
-        /// <summary>
-        /// Gets the parse tree of this template.
+        /// Gets or sets the parse tree of this template.
         /// </summary>
         /// <value>
         /// The parse tree of this template.
         /// </value>
-        public LGFileParser.TemplateDefinitionContext ParseTree { get; }
+        public LGTemplateParser.BodyContext TemplateBodyParseTree { get; set; }
 
         public override string ToString() => $"[{Name}({string.Join(", ", Parameters)})]\"{Body}\"";
-
-        /// <summary>
-        /// Get the startLine and stopLine of template.
-        /// </summary>
-        /// <returns>template content range.</returns>
-        public (int startLine, int stopLine) GetTemplateRange()
-        {
-            var startLine = ParseTree.Start.Line - 1;
-            var stopLine = ParseTree.Stop.Line - 1;
-            if (ParseTree?.Parent?.Parent is LGFileParser.FileContext fileContext)
-            {
-                var templateDefinitions = fileContext
-                        .paragraph()
-                        .Select(u => u.templateDefinition())
-                        .Where(u => u != null)
-                        .ToList();
-                var currentIndex = -1;
-                for (var i = 0; i < templateDefinitions.Count; i++)
-                {
-                    if (templateDefinitions[i] == ParseTree)
-                    {
-                        currentIndex = i;
-                        break;
-                    }
-                }
-
-                if (currentIndex >= 0 && currentIndex < templateDefinitions.Count - 1)
-                {
-                    // in the middle of templates
-                    stopLine = templateDefinitions[currentIndex + 1].Start.Line - 2;
-                }
-                else
-                {
-                    // last item
-                    stopLine = fileContext.Stop.Line - 1;
-                }
-            }
-
-            if (stopLine <= startLine)
-            {
-                stopLine = startLine;
-            }
-
-            return (startLine, stopLine);
-        }
-
-        private string ExtractBody(string lgfileContent)
-        {
-            var (startLine, stopLine) = GetTemplateRange();
-            return startLine >= stopLine ? string.Empty : GetRangeContent(lgfileContent, startLine + 1, stopLine);
-        }
-
-        private string ExtractName()
-        {
-            var name = ParseTree.templateNameLine().templateName()?.GetText();
-            return name ?? string.Empty;
-        }
-
-        private List<string> ExtractParameters()
-        {
-            var parameters = ParseTree.templateNameLine().parameters();
-            if (parameters != null)
-            {
-                return parameters.IDENTIFIER().Select(param => param.GetText()).ToList();
-            }
-
-            return new List<string>();
-        }
-
-        private string GetRangeContent(string originString, int startLine, int stopLine)
-        {
-            var originList = originString.Split(new[] { "\r\n", "\n", "\r" }, StringSplitOptions.None);
-            if (startLine < 0 || startLine > stopLine || stopLine >= originList.Length)
-            {
-                throw new Exception("index out of range.");
-            }
-
-            var destList = originList.Skip(startLine).Take(stopLine - startLine + 1);
-
-            return string.Join("\r\n", destList);
-        }
     }
 }
diff --git a/libraries/Microsoft.Bot.Builder.LanguageGeneration/TemplateErrors.cs b/libraries/Microsoft.Bot.Builder.LanguageGeneration/TemplateErrors.cs
index c94c12605..2f633d99a 100644
--- a/libraries/Microsoft.Bot.Builder.LanguageGeneration/TemplateErrors.cs
+++ b/libraries/Microsoft.Bot.Builder.LanguageGeneration/TemplateErrors.cs
@@ -62,7 +62,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
 
         public const string LoopDetected = "Loop detected:";
 
-        public const string SyntaxError = "Unexpected content. Expecting either a comment or a template definition or an import statement.";
+        public const string SyntaxError = "Unexpected content. Expecting a comment, template definition, import statement or option definition.";
 
         public const string InvalidMemory = "Scope is not a LG customized memory.";
 
@@ -82,8 +82,6 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
 
         public static string ArgumentMismatch(string templateName, int expectedCount, int actualCount) => $"arguments mismatch for template '{templateName}'. Expecting '{expectedCount}' arguments, actual '{actualCount}'.";
 
-        public static string ErrorTemplateNameformat(string templateName) => $"'{templateName}' cannot be used as a template name. Template names must be avalid string.";
-
         public static string TemplateExist(string templateName) => $"template '{templateName}' already exists.";
 
         public static string ExpressionParseError(string exp) => $"Error occurred when parsing expression '{exp}'.";
diff --git a/libraries/Microsoft.Bot.Builder.LanguageGeneration/TemplateImport.cs b/libraries/Microsoft.Bot.Builder.LanguageGeneration/TemplateImport.cs
index 45424c3c4..f8787528f 100644
--- a/libraries/Microsoft.Bot.Builder.LanguageGeneration/TemplateImport.cs
+++ b/libraries/Microsoft.Bot.Builder.LanguageGeneration/TemplateImport.cs
@@ -13,63 +13,43 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// <summary>
         /// Initializes a new instance of the <see cref="TemplateImport"/> class.
         /// </summary>
-        /// <param name="parseTree">The parse tree of this template.</param>
-        /// <param name="source">Source of this import.</param>
-        internal TemplateImport(LGFileParser.ImportDefinitionContext parseTree, string source = "")
+        /// <param name="description">Import description, which is in [].</param>
+        /// <param name="id">Import id, which is a path, in ().</param>
+        /// <param name="sourceRange">Source range of template.</param>
+        internal TemplateImport(string description, string id, SourceRange sourceRange)
         {
-            ParseTree = parseTree;
-            Source = source;
-
-            Description = ExtractDescription(parseTree);
-            Id = ExtractId(parseTree);
+            this.SourceRange = sourceRange;
+            this.Description = description;
+            this.Id = id;
         }
 
         /// <summary>
-        /// Gets description of the import, what's included by '[]' in a lg file.
+        /// Gets or sets description of the import, included by '[]' in a lg file.
         /// </summary>
         /// <value>
-        /// Description of the import, what's included by '[]' in a lg file.
+        /// Description of the import, included by '[]' in a lg file.
         /// </value>
-        public string Description { get; }
+        public string Description { get; set; }
 
         /// <summary>
-        /// Gets id of this import, what's included by '()' in a lg file.
+        /// Gets or sets id of this import, included by '()' in a lg file.
         /// </summary>
         /// <value>
         /// Id of this import.
         /// </value>
-        public string Id { get; }
+        public string Id { get; set; }
 
         /// <summary>
-        /// Gets origin root source of the import.
+        /// Gets or sets original root source of the import.
         /// </summary>
         /// <value>
-        /// origin root source of the import.
+        /// Original root source of the import.
         /// </value>
-        public string Source { get; }
+        public SourceRange SourceRange { get; set; }
 
-        /// <summary>
-        /// Gets the parse tree of this lg file.
-        /// </summary>
-        /// <value>
-        /// The parse tree of this lg file.
-        /// </value>
-        public LGFileParser.ImportDefinitionContext ParseTree { get; }
-
-        private string ExtractDescription(LGFileParser.ImportDefinitionContext parseTree)
+        public override string ToString()
         {
-            // content: [xxx](yyy)
-            var content = parseTree.GetText();
-            var closeSquareBracketIndex = content.IndexOf(']');
-            return content.Substring(1, closeSquareBracketIndex - 1);
-        }
-
-        private string ExtractId(LGFileParser.ImportDefinitionContext parseTree)
-        {
-            // content: [xxx](yyy)
-            var content = parseTree.GetText();
-            var lastOpenBracketIndex = content.LastIndexOf('(');
-            return content.Substring(lastOpenBracketIndex + 1, content.Length - lastOpenBracketIndex - 2);
+            return $"[{Description}]({Id})";
         }
     }
 }
diff --git a/libraries/Microsoft.Bot.Builder.LanguageGeneration/Templates.cs b/libraries/Microsoft.Bot.Builder.LanguageGeneration/Templates.cs
index 8e9609f3b..aad74e1a0 100644
--- a/libraries/Microsoft.Bot.Builder.LanguageGeneration/Templates.cs
+++ b/libraries/Microsoft.Bot.Builder.LanguageGeneration/Templates.cs
@@ -77,7 +77,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// Gets or sets expression parser.
         /// </summary>
         /// <value>
-        /// expression parser.
+        /// Expression parser.
         /// </value>
         public ExpressionParser ExpressionParser { get; set; }
 
@@ -85,7 +85,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// Gets or sets import elements that this LG file contains directly.
         /// </summary>
         /// <value>
-        /// import elements that this LG file contains directly.
+        /// Import elements that this LG file contains directly.
         /// </value>
         public IList<TemplateImport> Imports { get; set; }
 
@@ -96,7 +96,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// so, reference count may >= imports count. 
         /// </summary>
         /// <value>
-        /// all references that this LG file has from <see cref="Imports"/>.
+        /// All references that this LG file has from <see cref="Imports"/>.
         /// </value>
         public IList<Templates> References { get; set; }
 
@@ -104,7 +104,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// Gets or sets diagnostics.
         /// </summary>
         /// <value>
-        /// diagnostics.
+        /// Diagnostics.
         /// </value>
         public IList<Diagnostic> Diagnostics { get; set; }
 
@@ -120,7 +120,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// Gets or sets id of this LG file.
         /// </summary>
         /// <value>
-        /// id of this lg source. For file, is full path.
+        /// Id of this lg source. For file, is full path.
         /// </value>
         public string Id { get; set; }
 
@@ -147,7 +147,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// <summary>
         /// Parser to turn lg content into a <see cref="LanguageGeneration.Templates"/>.
         /// </summary>
-        /// <param name="filePath"> absolut path of a LG file.</param>
+        /// <param name="filePath">Absolute path of a LG file.</param>
         /// <param name="importResolver">resolver to resolve LG import id to template text.</param>
         /// <param name="expressionParser">expressionEngine Expression engine for evaluating expressions.</param>
         /// <returns>new <see cref="LanguageGeneration.Templates"/> entity.</returns>
@@ -160,10 +160,10 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// Parser to turn lg content into a <see cref="LanguageGeneration.Templates"/>.
         /// </summary>
         /// <param name="content">Text content contains lg templates.</param>
-        /// <param name="id">id is the identifier of content. If importResolver is null, id must be a full path string. </param>
-        /// <param name="importResolver">resolver to resolve LG import id to template text.</param>
-        /// <param name="expressionParser">expressionEngine parser engine for parsing expressions.</param>
-        /// <returns>new <see cref="LanguageGeneration.Templates"/> entity.</returns>
+        /// <param name="id">Id is the identifier of content. If importResolver is null, id must be a full path string. </param>
+        /// <param name="importResolver">Resolver to resolve LG import id to template text.</param>
+        /// <param name="expressionParser">Expression parser engine for parsing expressions.</param>
+        /// <returns>new <see cref="Templates"/> entity.</returns>
         public static Templates ParseText(
             string content,
             string id = "",
@@ -187,8 +187,8 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// <summary>
         /// Use to evaluate an inline template str.
         /// </summary>
-        /// <param name="text">inline string which will be evaluated.</param>
-        /// <param name="scope">scope object or JToken.</param>
+        /// <param name="text">Inline string which will be evaluated.</param>
+        /// <param name="scope">Scope object or JToken.</param>
         /// <returns>Evaluate result.</returns>
         public object EvaluateText(string text, object scope = null)
         {
@@ -229,10 +229,10 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
 
         /// <summary>
         /// (experimental)
-        /// Analyzer a template to get the static analyzer results including variables and template references.
+        /// Analyze a template to get the static analyzer results including variables and template references.
         /// </summary>
         /// <param name="templateName">Template name to be evaluated.</param>
-        /// <returns>analyzer result.</returns>
+        /// <returns>Analyzer result.</returns>
         public AnalyzerResult AnalyzeTemplate(string templateName)
         {
             CheckErrors();
@@ -241,13 +241,13 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         }
 
         /// <summary>
-        /// update an exist template.
+        /// Update an existing template.
         /// </summary>
-        /// <param name="templateName">origin template name. the only id of a template.</param>
-        /// <param name="newTemplateName">new template Name.</param>
-        /// <param name="parameters">new params.</param>
-        /// <param name="templateBody">new template body.</param>
-        /// <returns>updated LG file.</returns>
+        /// <param name="templateName">Original template name. The only id of a template.</param>
+        /// <param name="newTemplateName">New template Name.</param>
+        /// <param name="parameters">New params.</param>
+        /// <param name="templateBody">New template body.</param>
+        /// <returns>Updated LG file.</returns>
         public Templates UpdateTemplate(string templateName, string newTemplateName, List<string> parameters, string templateBody)
         {
             var template = this.FirstOrDefault(u => u.Name == templateName);
@@ -256,7 +256,9 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
                 var templateNameLine = BuildTemplateNameLine(newTemplateName, parameters);
                 var newTemplateBody = ConvertTemplateBody(templateBody);
                 var content = $"{templateNameLine}{newLine}{newTemplateBody}";
-                var (startLine, stopLine) = template.GetTemplateRange();
+
+                var startLine = template.SourceRange.Range.Start.Line - 1;
+                var stopLine = template.SourceRange.Range.End.Line - 1;
 
                 var newContent = ReplaceRangeContent(Content, startLine, stopLine, content);
                 Initialize(ParseText(newContent, Id, ImportResolver));
@@ -268,10 +270,10 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// <summary>
         /// Add a new template and return LG File.
         /// </summary>
-        /// <param name="templateName">new template name.</param>
-        /// <param name="parameters">new params.</param>
-        /// <param name="templateBody">new  template body.</param>
-        /// <returns>updated LG file.</returns>
+        /// <param name="templateName">New template name.</param>
+        /// <param name="parameters">New params.</param>
+        /// <param name="templateBody">New  template body.</param>
+        /// <returns>Updated LG file.</returns>
         public Templates AddTemplate(string templateName, List<string> parameters, string templateBody)
         {
             var template = this.FirstOrDefault(u => u.Name == templateName);
@@ -291,15 +293,15 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// <summary>
         /// Delete an exist template.
         /// </summary>
-        /// <param name="templateName">which template should delete.</param>
-        /// <returns>updated LG file.</returns>
+        /// <param name="templateName">Which template should delete.</param>
+        /// <returns>Updated LG file.</returns>
         public Templates DeleteTemplate(string templateName)
         {
             var template = this.FirstOrDefault(u => u.Name == templateName);
             if (template != null)
             {
-                var (startLine, stopLine) = template.GetTemplateRange();
-
+                var startLine = template.SourceRange.Range.Start.Line - 1;
+                var stopLine = template.SourceRange.Range.End.Line - 1;
                 var newContent = ReplaceRangeContent(Content, startLine, stopLine, null);
                 Initialize(ParseText(newContent, Id, ImportResolver));
             }
@@ -363,7 +365,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         }
 
         /// <summary>
-        /// use an existing LG file to override current object.
+        /// Use an existing LG file to override current object.
         /// </summary>
         /// <param name="templates">Existing LG file.</param>
         private void Initialize(Templates templates)
diff --git a/libraries/Microsoft.Bot.Builder.LanguageGeneration/TemplatesParser.cs b/libraries/Microsoft.Bot.Builder.LanguageGeneration/TemplatesParser.cs
index e903dbcff..07c103f04 100644
--- a/libraries/Microsoft.Bot.Builder.LanguageGeneration/TemplatesParser.cs
+++ b/libraries/Microsoft.Bot.Builder.LanguageGeneration/TemplatesParser.cs
@@ -8,6 +8,8 @@ using System.Linq;
 using System.Text.RegularExpressions;
 using AdaptiveExpressions;
 using Antlr4.Runtime;
+using Antlr4.Runtime.Misc;
+using Antlr4.Runtime.Tree;
 
 namespace Microsoft.Bot.Builder.LanguageGeneration
 {
@@ -27,14 +29,19 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// <summary>
         /// option regex.
         /// </summary>
-        private static readonly Regex OptionRegex = new Regex(@"^> *!#(.*)$");
+        public static readonly Regex OptionRegex = new Regex(@">\s*!#(.*)");
+
+        /// <summary>
+        /// Import regex.
+        /// </summary>
+        public static readonly Regex ImportRegex = new Regex(@"\[([^]]*)\]\(([^)]*)\)");
 
         /// <summary>
         /// Parser to turn lg content into a <see cref="Templates"/>.
         /// </summary>
-        /// <param name="filePath"> absolut path of a LG file.</param>
-        /// <param name="importResolver">resolver to resolve LG import id to template text.</param>
-        /// <param name="expressionParser">expressionEngine Expression engine for evaluating expressions.</param>
+        /// <param name="filePath">Absolut path of a LG file.</param>
+        /// <param name="importResolver">Resolver to resolve LG import id to template text.</param>
+        /// <param name="expressionParser">Expression parser for parsing expressions.</param>
         /// <returns>new <see cref="Templates"/> entity.</returns>
         public static Templates ParseFile(
             string filePath,
@@ -51,10 +58,10 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// Parser to turn lg content into a <see cref="Templates"/>.
         /// </summary>
         /// <param name="content">Text content contains lg templates.</param>
-        /// <param name="id">id is the identifier of content. If importResolver is null, id must be a full path string. </param>
-        /// <param name="importResolver">resolver to resolve LG import id to template text.</param>
-        /// <param name="expressionParser">expressionEngine parser engine for parsing expressions.</param>
-        /// <returns>new <see cref="Templates"/> entity.</returns>
+        /// <param name="id">Id is the identifier of content. If importResolver is null, id must be a full path string. </param>
+        /// <param name="importResolver">Resolver to resolve LG import id to template text.</param>
+        /// <param name="expressionParser">Expression parser for parsing expressions.</param>
+        /// <returns>New <see cref="Templates"/> entity.</returns>
         public static Templates ParseText(
             string content,
             string id = "",
@@ -68,8 +75,8 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// Parser to turn lg content into a <see cref="Templates"/> based on the original LGFile.
         /// </summary>
         /// <param name="content">Text content contains lg templates.</param>
-        /// <param name="lg">original LGFile.</param>
-        /// <returns>new <see cref="Templates"/> entity.</returns>
+        /// <param name="lg">Original LGFile.</param>
+        /// <returns>New <see cref="Templates"/> entity.</returns>
         public static Templates ParseTextWithRef(string content, Templates lg)
         {
             if (lg == null)
@@ -79,33 +86,20 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
 
             var id = "inline content";
             var newLG = new Templates(content: content, id: id, importResolver: lg.ImportResolver, options: lg.Options);
-            var diagnostics = new List<Diagnostic>();
             try
             {
-                var (templates, imports, invalidTemplateErrors, options) = AntlrParse(content, id);
-                newLG.AddRange(templates);
-                newLG.Imports = imports;
-                newLG.Options = options;
-                diagnostics.AddRange(invalidTemplateErrors);
-
+                newLG = new TemplatesTransformer(newLG).Transform(AntlrParseTemplates(content, id));
                 newLG.References = GetReferences(newLG)
                         .Union(lg.References)
                         .Union(new List<Templates> { lg })
                         .ToList();
 
-                var semanticErrors = new StaticChecker(newLG).Check();
-                diagnostics.AddRange(semanticErrors);
+                new StaticChecker(newLG).Check().ForEach(u => newLG.Diagnostics.Add(u));
             }
             catch (TemplateException ex)
             {
-                diagnostics.AddRange(ex.Diagnostics);
+                ex.Diagnostics.ToList().ForEach(u => newLG.Diagnostics.Add(u));
             }
-            catch (Exception err)
-            {
-                diagnostics.Add(BuildDiagnostic(err.Message, source: id));
-            }
-
-            newLG.Diagnostics = diagnostics;
 
             return newLG;
         }
@@ -114,10 +108,10 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// Parser to turn lg content into a <see cref="Templates"/>.
         /// </summary>
         /// <param name="content">Text content contains lg templates.</param>
-        /// <param name="id">id is the identifier of content. If importResolver is null, id must be a full path string. </param>
-        /// <param name="importResolver">resolver to resolve LG import id to template text.</param>
-        /// <param name="expressionParser">expressionEngine parser engine for parsing expressions.</param>
-        /// <param name="cachedTemplates">give the file path and templates to avoid parsing and to improve performance.</param>
+        /// <param name="id">Id is the identifier of content. If importResolver is null, id must be a full path string. </param>
+        /// <param name="importResolver">Resolver to resolve LG import id to template text.</param>
+        /// <param name="expressionParser">Expression parser for parsing expressions.</param>
+        /// <param name="cachedTemplates">Give the file path and templates to avoid parsing and to improve performance.</param>
         /// <returns>new <see cref="Templates"/> entity.</returns>
         private static Templates InnerParseText(
             string content,
@@ -135,29 +129,16 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
             importResolver = importResolver ?? DefaultFileResolver;
             var lg = new Templates(content: content, id: id, importResolver: importResolver, expressionParser: expressionParser);
 
-            var diagnostics = new List<Diagnostic>();
             try
             {
-                var (templates, imports, invalidTemplateErrors, options) = AntlrParse(content, id);
-                lg.AddRange(templates);
-                lg.Imports = imports;
-                lg.Options = options;
-                diagnostics.AddRange(invalidTemplateErrors);
-
+                lg = new TemplatesTransformer(lg).Transform(AntlrParseTemplates(content, id));
                 lg.References = GetReferences(lg, cachedTemplates);
-                var semanticErrors = new StaticChecker(lg).Check();
-                diagnostics.AddRange(semanticErrors);
+                new StaticChecker(lg).Check().ForEach(u => lg.Diagnostics.Add(u));
             }
             catch (TemplateException ex)
             {
-                diagnostics.AddRange(ex.Diagnostics);
+                ex.Diagnostics.ToList().ForEach(u => lg.Diagnostics.Add(u));
             }
-            catch (Exception err)
-            {
-                diagnostics.Add(BuildDiagnostic(err.Message, source: id));
-            }
-
-            lg.Diagnostics = diagnostics;
 
             return lg;
         }
@@ -165,9 +146,9 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
         /// <summary>
         /// Default import resolver, using relative/absolute file path to access the file content.
         /// </summary>
-        /// <param name="sourceId">default is file path.</param>
-        /// <param name="resourceId">import path.</param>
-        /// <returns>target content id.</returns>
+        /// <param name="sourceId">Default is file path.</param>
+        /// <param name="resourceId">Import path.</param>
+        /// <returns>Target content id.</returns>
         private static (string content, string id) DefaultFileResolver(string sourceId, string resourceId)
         {
             // import paths are in resource files which can be executed on multiple OS environments
@@ -183,41 +164,7 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
             return (File.ReadAllText(importPath), importPath);
         }
 
-        private static (IList<Template> templates, IList<TemplateImport> imports, IList<Diagnostic> diagnostics, IList<string> options) AntlrParse(string content, string id = "")
-        {
-            var fileContext = GetFileContentContext(content, id);
-            var templates = ExtractLGTemplates(fileContext, content, id);
-            var imports = ExtractLGImports(fileContext, id);
-            var options = ExtractLGOptions(fileContext);
-            var diagnostics = GetInvalidTemplateErrors(fileContext, id);
-
-            return (templates, imports, diagnostics, options);
-        }
-
-        private static IList<Diagnostic> GetInvalidTemplateErrors(LGFileParser.FileContext fileContext, string id)
-        {
-            var errorTemplates = fileContext == null ? new List<LGFileParser.ErrorTemplateContext>() :
-                   fileContext.paragraph()
-                   .Select(x => x.errorTemplate())
-                   .Where(x => x != null);
-
-            return errorTemplates.Select(u => BuildDiagnostic("error context.", u, id)).ToList();
-        }
-
-        private static Diagnostic BuildDiagnostic(string errorMessage, ParserRuleContext context = null, string source = null)
-        {
-            errorMessage = TemplateErrors.StaticFailure + "- " + errorMessage;
-            var startPosition = context == null ? new Position(0, 0) : new Position(context.Start.Line, context.Start.Column);
-            var stopPosition = context == null ? new Position(0, 0) : new Position(context.Stop.Line, context.Stop.Column + context.Stop.Text.Length);
-            return new Diagnostic(new Range(startPosition, stopPosition), errorMessage, source: source);
-        }
-
-        /// <summary>
-        /// Get parsed tree nodes from text by antlr4 engine.
-        /// </summary>
-        /// <param name="text">Original text which will be parsed.</param>
-        /// <returns>Parsed tree nodes.</returns>
-        private static LGFileParser.FileContext GetFileContentContext(string text, string id)
+        private static IParseTree AntlrParseTemplates(string text, string id)
         {
             if (string.IsNullOrEmpty(text))
             {
@@ -239,72 +186,6 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
             return parser.file();
         }
 
-        /// <summary>
-        /// Extract LG templates from the parse tree of a file.
-        /// </summary>
-        /// <param name="file">LG file context from ANTLR parser.</param>
-        /// <param name="lgfileContent">LG file content.</param>
-        /// <param name="source">text source.</param>
-        /// <returns>LG template list.</returns>
-        private static IList<Template> ExtractLGTemplates(LGFileParser.FileContext file, string lgfileContent, string source = "")
-        {
-            return file == null ? new List<Template>() :
-                   file.paragraph()
-                   .Select(x => x.templateDefinition())
-                   .Where(x => x != null)
-                   .Select(t => new Template(t, lgfileContent, source))
-                   .ToList();
-        }
-
-        /// <summary>
-        /// Extract LG options from the parse tree of a file.
-        /// </summary>
-        /// <param name="file">LG file context from ANTLR parser.</param>
-        /// <returns>Option list.</returns>
-        private static IList<string> ExtractLGOptions(LGFileParser.FileContext file)
-        {
-            return file == null ? new List<string>() :
-                   file.paragraph()
-                   .Select(x => x.optionsDefinition())
-                   .Where(x => x != null)
-                   .Select(t => ExtractOption(t.GetText()))
-                   .Where(t => !string.IsNullOrEmpty(t))
-                   .ToList();
-        }
-
-        private static string ExtractOption(string originalText)
-        {
-            var result = string.Empty;
-            if (string.IsNullOrWhiteSpace(originalText))
-            {
-                return result;
-            }
-
-            var matchResult = OptionRegex.Match(originalText);
-            if (matchResult.Success && matchResult.Groups.Count == 2)
-            {
-                result = matchResult.Groups[1].Value?.Trim();
-            }
-
-            return result;
-        }
-
-        /// <summary>
-        /// Extract LG imports from a file parse tree.
-        /// </summary>
-        /// <param name="file">LG file context from ANTLR parser.</param>
-        /// <param name="source">text source.</param>
-        /// <returns>lg template list.</returns>
-        private static IList<TemplateImport> ExtractLGImports(LGFileParser.FileContext file, string source = "")
-        {
-            return file == null ? new List<TemplateImport>() :
-                   file.paragraph()
-                   .Select(x => x.importDefinition())
-                   .Where(x => x != null)
-                   .Select(t => new TemplateImport(t, source))
-                   .ToList();
-        }
-
         private static IList<Templates> GetReferences(Templates file, Dictionary<string, Templates> cachedTemplates = null)
         {
             var resourcesFound = new HashSet<Templates>();
@@ -316,38 +197,248 @@ namespace Microsoft.Bot.Builder.LanguageGeneration
 
         private static void ResolveImportResources(Templates start, HashSet<Templates> resourcesFound, Dictionary<string, Templates> cachedTemplates)
         {
-            var resourceIds = start.Imports.Select(lg => lg.Id);
             resourcesFound.Add(start);
 
-            foreach (var id in resourceIds)
+            foreach (var import in start.Imports)
             {
+                string content;
+                string path;
                 try
                 {
-                    var (content, path) = start.ImportResolver(start.Id, id);
-                    if (resourcesFound.All(u => u.Id != path))
-                    {
-                        Templates childResource;
-                        if (cachedTemplates.ContainsKey(path))
-                        {
-                            childResource = cachedTemplates[path];
-                        }
-                        else
-                        {
-                            childResource = InnerParseText(content, path, start.ImportResolver, start.ExpressionParser, cachedTemplates);
-                            cachedTemplates.Add(path, childResource);
-                        }
+                    (content, path) = start.ImportResolver(start.Id, import.Id);
+                }
+                catch (Exception e)
+                {
+                    var diagnostic = new Diagnostic(import.SourceRange.ParseTree.ConvertToRange(), e.Message, DiagnosticSeverity.Error, start.Id);
+                    throw new TemplateException(e.Message, new List<Diagnostic>() { diagnostic });
+                }
 
-                        ResolveImportResources(childResource, resourcesFound, cachedTemplates);
+                if (resourcesFound.All(u => u.Id != path))
+                {
+                    Templates childResource;
+                    if (cachedTemplates.ContainsKey(path))
+                    {
+                        childResource = cachedTemplates[path];
+                    }
+                    else
+                    {
+                        childResource = InnerParseText(content, path, start.ImportResolver, start.ExpressionParser, cachedTemplates);
+                        cachedTemplates.Add(path, childResource);
+                    }
+
+                    ResolveImportResources(childResource, resourcesFound, cachedTemplates);
+                }
+            }
+        }
+
+        private class TemplatesTransformer : LGFileParserBaseVisitor<object>
+        {
+            private static readonly Regex IdentifierRegex = new Regex(@"^[0-9a-zA-Z_]+$");
+            private readonly Templates templates;
+
+            public TemplatesTransformer(Templates templates)
+            {
+                this.templates = templates;
+            }
+
+            public Templates Transform(IParseTree parseTree)
+            {
+                Visit(parseTree);
+                return this.templates;
+            }
+
+            public override object VisitErrorDefinition([NotNull] LGFileParser.ErrorDefinitionContext context)
+            {
+                var lineContent = context.INVALID_LINE().GetText();
+                if (!string.IsNullOrWhiteSpace(lineContent))
+                {
+                    this.templates.Diagnostics.Add(BuildTemplatesDiagnostic(TemplateErrors.SyntaxError, context));
+                }
+
+                return null;
+            }
+
+            public override object VisitImportDefinition([NotNull] LGFileParser.ImportDefinitionContext context)
+            {
+                var importStr = context.IMPORT().GetText();
+
+                var matchResult = ImportRegex.Match(importStr);
+                if (matchResult.Success && matchResult.Groups.Count == 3)
+                {
+                    var description = matchResult.Groups[1].Value?.Trim();
+                    var id = matchResult.Groups[2].Value?.Trim();
+
+                    var sourceRange = new SourceRange(context, this.templates.Id);
+                    var import = new TemplateImport(description, id, sourceRange);
+                    this.templates.Imports.Add(import);
+                }
+
+                return null;
+            }
+
+            public override object VisitOptionDefinition([NotNull] LGFileParser.OptionDefinitionContext context)
+            {
+                var originalText = context.OPTION().GetText();
+                var result = string.Empty;
+                if (!string.IsNullOrWhiteSpace(originalText))
+                {
+                    var matchResult = OptionRegex.Match(originalText);
+                    if (matchResult.Success && matchResult.Groups.Count == 2)
+                    {
+                        result = matchResult.Groups[1].Value?.Trim();
                     }
                 }
-                catch (TemplateException err)
+
+                if (!string.IsNullOrWhiteSpace(result))
                 {
-                    throw err;
+                    this.templates.Options.Add(result);
                 }
-                catch (Exception err)
+
+                return null;
+            }
+
+            public override object VisitTemplateDefinition([NotNull] LGFileParser.TemplateDefinitionContext context)
+            {
+                var startLine = context.Start.Line;
+                var stopLine = context.Stop.Line;
+
+                var templateNameLine = context.templateNameLine().TEMPLATE_NAME_LINE().GetText();
+                var (templateName, parameters) = ExtractTemplateNameLine(templateNameLine);
+
+                if (this.templates.Any(u => u.Name == templateName))
                 {
-                    throw new TemplateException(err.Message, new List<Diagnostic> { BuildDiagnostic(err.Message, source: start.Id) });
+                    var diagnostic = BuildTemplatesDiagnostic(TemplateErrors.DuplicatedTemplateInSameTemplate(templateName), context.templateNameLine());
+                    this.templates.Diagnostics.Add(diagnostic);
                 }
+                else
+                {
+                    var templateBody = context.templateBody().GetText();
+                    var file = context.Parent.Parent as LGFileParser.FileContext;
+                    var isLastTemplate = file.paragraph().Select(u => u.templateDefinition()).Where(u => u != null).Last() == context;
+                    if (!isLastTemplate)
+                    {
+                        templateBody = RemoveTrailingNewline(templateBody);
+                    }
+
+                    var sourceRange = new SourceRange(context, this.templates.Id);
+                    var template = new Template(templateName, parameters, templateBody, sourceRange);
+
+                    CheckTemplateName(templateName, context.templateNameLine());
+                    CheckTemplateParameters(parameters, context.templateNameLine());
+                    template.TemplateBodyParseTree = CheckTemplateBody(templateName, templateBody, context.templateBody(), startLine);
+
+                    this.templates.Add(template);
+                }
+
+                return null;
+            }
+
+            private LGTemplateParser.BodyContext CheckTemplateBody(string templateName, string templateBody, LGFileParser.TemplateBodyContext context, int startLine)
+            {
+                if (string.IsNullOrWhiteSpace(templateBody))
+                {
+                    var diagnostic = BuildTemplatesDiagnostic(TemplateErrors.NoTemplateBody(templateName), context, DiagnosticSeverity.Warning);
+                    this.templates.Diagnostics.Add(diagnostic);
+                }
+                else
+                {
+                    try
+                    {
+                        return AntlrParseTemplate(templateBody, startLine);
+                    }
+                    catch (TemplateException e)
+                    {
+                        e.Diagnostics.ToList().ForEach(u => this.templates.Diagnostics.Add(u));
+                    }
+                }
+
+                return null;
+            }
+
+            private void CheckTemplateParameters(List<string> parameters, LGFileParser.TemplateNameLineContext context)
+            {
+                foreach (var parameter in parameters)
+                {
+                    if (!IdentifierRegex.IsMatch(parameter))
+                    {
+                        var diagnostic = BuildTemplatesDiagnostic(TemplateErrors.InvalidTemplateName, context);
+                        this.templates.Diagnostics.Add(diagnostic);
+                    }
+                }
+            }
+
+            private void CheckTemplateName(string templateName, ParserRuleContext context)
+            {
+                var functionNameSplitDot = templateName.Split('.');
+                foreach (var id in functionNameSplitDot)
+                {
+                    if (!IdentifierRegex.IsMatch(id))
+                    {
+                        var diagnostic = BuildTemplatesDiagnostic(TemplateErrors.InvalidTemplateName, context);
+                        this.templates.Diagnostics.Add(diagnostic);
+                    }
+                }
+            }
+
+            private (string templateName, List<string> parameters) ExtractTemplateNameLine(string templateNameLine)
+            {
+                var hashIndex = templateNameLine.IndexOf('#');
+
+                templateNameLine = templateNameLine.Substring(hashIndex + 1).Trim();
+
+                var templateName = templateNameLine;
+                var parameters = new List<string>();
+                var leftBracketIndex = templateNameLine.IndexOf("(");
+                if (leftBracketIndex >= 0 && templateNameLine.EndsWith(")"))
+                {
+                    templateName = templateNameLine.Substring(0, leftBracketIndex).Trim();
+                    var paramString = templateNameLine.Substring(leftBracketIndex + 1, templateNameLine.Length - leftBracketIndex - 2);
+                    if (!string.IsNullOrWhiteSpace(paramString))
+                    {
+                        parameters = paramString.Split(',').Select(u => u.Trim()).ToList();
+                    }
+                }
+
+                return (templateName, parameters);
+            }
+
+            private string RemoveTrailingNewline(string line)
+            {
+                // remove the end newline of middle template.
+                var result = line;
+
+                if (result.EndsWith("\n", StringComparison.Ordinal))
+                {
+                    result = result.Substring(0, result.Length - 1);
+                    if (result.EndsWith("\r", StringComparison.Ordinal))
+                    {
+                        result = result.Substring(0, result.Length - 1);
+                    }
+                }
+
+                return result;
+            }
+
+            private LGTemplateParser.BodyContext AntlrParseTemplate(string templateBody, int lineOffset)
+            {
+                var input = new AntlrInputStream(templateBody);
+                var lexer = new LGTemplateLexer(input);
+                lexer.RemoveErrorListeners();
+
+                var tokens = new CommonTokenStream(lexer);
+                var parser = new LGTemplateParser(tokens);
+                parser.RemoveErrorListeners();
+                var listener = new ErrorListener(this.templates.Id, lineOffset);
+
+                parser.AddErrorListener(listener);
+                parser.BuildParseTree = true;
+
+                return parser.context().body();
+            }
+
+            private Diagnostic BuildTemplatesDiagnostic(string errorMessage, ParserRuleContext context, DiagnosticSeverity severity = DiagnosticSeverity.Error)
+            {
+                return new Diagnostic(context.ConvertToRange(), errorMessage, severity, this.templates.Id);
             }
         }
     }
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-Bread.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-Bread.en-us.lg
index c8bc3c767..cc74dfa87 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-Bread.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-Bread.en-us.lg
@@ -1,4 +1,6 @@
-
+[sandwichTest-BreadEntity.lg](sandwichTest-BreadEntity.lg)
+[sandwichTest-library.lg](sandwichTest-library.lg)
+[sandwichTest-library-Missing.lg](sandwichTest-library-Missing.lg)
 
 # AskBread
 - ${askEnum('Bread')}
@@ -10,6 +12,3 @@
 
 # Bread(val)
 - ${BreadEntity(val)}
-[sandwichTest-BreadEntity.lg](sandwichTest-BreadEntity.lg)
-[sandwichTest-library.lg](sandwichTest-library.lg)
-[sandwichTest-library-Missing.lg](sandwichTest-library-Missing.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-BreadEntity.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-BreadEntity.en-us.lg
index 989252eb5..a8f648fa4 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-BreadEntity.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-BreadEntity.en-us.lg
@@ -1,4 +1,5 @@
-
+[sandwichTest-library.lg](sandwichTest-library.lg)
+[sandwichTest-library-Choose.lg](sandwichTest-library-Choose.lg)
  
  # BreadEntity(value) 
  - SWITCH: ${value}
@@ -16,5 +17,3 @@
  
  # chooseBreadEntity
  - ${chooseEnumEntity('Bread')}
-[sandwichTest-library.lg](sandwichTest-library.lg)
-[sandwichTest-library-Choose.lg](sandwichTest-library-Choose.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-Cheese.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-Cheese.en-us.lg
index 147c2a18a..05df47a73 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-Cheese.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-Cheese.en-us.lg
@@ -1,4 +1,6 @@
-
+[sandwichTest-CheeseEntity.lg](sandwichTest-CheeseEntity.lg)
+[sandwichTest-library.lg](sandwichTest-library.lg)
+[sandwichTest-library-Missing.lg](sandwichTest-library-Missing.lg)
 
 # AskCheese
 - ${askEnum('Cheese')}
@@ -10,6 +12,3 @@
 
 # Cheese(val)
 - ${CheeseEntity(val)}
-[sandwichTest-CheeseEntity.lg](sandwichTest-CheeseEntity.lg)
-[sandwichTest-library.lg](sandwichTest-library.lg)
-[sandwichTest-library-Missing.lg](sandwichTest-library-Missing.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-CheeseEntity.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-CheeseEntity.en-us.lg
index af941888e..0254be765 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-CheeseEntity.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-CheeseEntity.en-us.lg
@@ -1,4 +1,5 @@
-
+[sandwichTest-library.lg](sandwichTest-library.lg)
+[sandwichTest-library-Choose.lg](sandwichTest-library-Choose.lg)
  
  # CheeseEntity(value) 
  - SWITCH: ${value}
@@ -24,5 +25,3 @@
  
  # chooseCheeseEntity
  - ${chooseEnumEntity('Cheese')}
-[sandwichTest-library.lg](sandwichTest-library.lg)
-[sandwichTest-library-Choose.lg](sandwichTest-library-Choose.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-Length.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-Length.en-us.lg
index 471811321..46d25229d 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-Length.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-Length.en-us.lg
@@ -1,4 +1,5 @@
-
+[sandwichTest-library.lg](sandwichTest-library.lg)
+[sandwichTest-library-Missing.lg](sandwichTest-library-Missing.lg)
 
 # AskLength
 - ${askString('Length')}
@@ -6,5 +7,3 @@
 
 # LengthName
 - length
-[sandwichTest-library.lg](sandwichTest-library.lg)
-[sandwichTest-library-Missing.lg](sandwichTest-library-Missing.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-Meat.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-Meat.en-us.lg
index fb9865f2d..79e76739f 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-Meat.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-Meat.en-us.lg
@@ -1,4 +1,6 @@
-
+[sandwichTest-MeatEntity.lg](sandwichTest-MeatEntity.lg)
+[sandwichTest-library.lg](sandwichTest-library.lg)
+[sandwichTest-library-Missing.lg](sandwichTest-library-Missing.lg)
 
 # AskMeat
 - ${askEnum('Meat')}
@@ -10,6 +12,3 @@
 
 # Meat(val)
 - ${MeatEntity(val)}
-[sandwichTest-MeatEntity.lg](sandwichTest-MeatEntity.lg)
-[sandwichTest-library.lg](sandwichTest-library.lg)
-[sandwichTest-library-Missing.lg](sandwichTest-library-Missing.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-MeatEntity.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-MeatEntity.en-us.lg
index b28c4ea4b..64bd6f9bd 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-MeatEntity.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-MeatEntity.en-us.lg
@@ -1,4 +1,5 @@
-
+[sandwichTest-library.lg](sandwichTest-library.lg)
+[sandwichTest-library-Choose.lg](sandwichTest-library-Choose.lg)
  
  # MeatEntity(value) 
  - SWITCH: ${value}
@@ -24,5 +25,3 @@
  
  # chooseMeatEntity
  - ${chooseEnumEntity('Meat')}
-[sandwichTest-library.lg](sandwichTest-library.lg)
-[sandwichTest-library-Choose.lg](sandwichTest-library-Choose.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-Name.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-Name.en-us.lg
index 7d4ef503b..d734b8102 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-Name.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-Name.en-us.lg
@@ -1,4 +1,6 @@
-
+[sandwichTest-NameEntity.lg](sandwichTest-NameEntity.lg)
+[sandwichTest-library.lg](sandwichTest-library.lg)
+[sandwichTest-library-Missing.lg](sandwichTest-library-Missing.lg)
 
 # AskName
 - ${askString('Name')}
@@ -10,6 +12,3 @@
 
 # Name(val)
 - ${NameEntity(val)}
-[sandwichTest-NameEntity.lg](sandwichTest-NameEntity.lg)
-[sandwichTest-library.lg](sandwichTest-library.lg)
-[sandwichTest-library-Missing.lg](sandwichTest-library-Missing.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-Price.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-Price.en-us.lg
index a93fc1400..c86ead58f 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-Price.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-Price.en-us.lg
@@ -1,4 +1,5 @@
-
+[sandwichTest-library.lg](sandwichTest-library.lg)
+[sandwichTest-library-Missing.lg](sandwichTest-library-Missing.lg)
 
 # AskPrice
 - ${askString('Price')}
@@ -6,5 +7,3 @@
 
 # PriceName
 - price
-[sandwichTest-library.lg](sandwichTest-library.lg)
-[sandwichTest-library-Missing.lg](sandwichTest-library-Missing.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-Quantity.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-Quantity.en-us.lg
index a082722ca..530f57bca 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-Quantity.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-Quantity.en-us.lg
@@ -1,4 +1,6 @@
-
+[sandwichTest-QuantityEntity.lg](sandwichTest-QuantityEntity.lg)
+[sandwichTest-library.lg](sandwichTest-library.lg)
+[sandwichTest-library-Missing.lg](sandwichTest-library-Missing.lg)
 
 # AskQuantity
 - ${askNumber('Quantity')}
@@ -10,6 +12,3 @@
 
 # Quantity(val)
 - ${QuantityEntity(val)}
-[sandwichTest-QuantityEntity.lg](sandwichTest-QuantityEntity.lg)
-[sandwichTest-library.lg](sandwichTest-library.lg)
-[sandwichTest-library-Missing.lg](sandwichTest-library-Missing.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-library-Assign.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-library-Assign.en-us.lg
index de31dd887..9bc467f2d 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-library-Assign.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-library-Assign.en-us.lg
@@ -1,3 +1,6 @@
+[sandwichTest-library.lg](sandwichTest-library.lg)
+[sandwichTest-library-ReadForm.lg](sandwichTest-library-ReadForm.lg)
+
 # numberValidation(property, number)
 - IF: ${less(number, dialogClass.schema.properties[property].minimum)}
 - ${number} is less than the minimum value ${dialogClass.schema.properties[property].minimum}.
@@ -35,5 +38,3 @@
 
 # unexpectedPropertyChange(property, val, oldVal)
 - ${name(property)} is changed from ${value(property, oldVal)} to ${value(property, val)}.
-[sandwichTest-library.lg](sandwichTest-library.lg)
-[sandwichTest-library-ReadForm.lg](sandwichTest-library-ReadForm.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-library-Choose.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-library-Choose.en-us.lg
index b378cdbb3..1e21b2812 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-library-Choose.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-library-Choose.en-us.lg
@@ -1,3 +1,6 @@
+[sandwichTest-library.lg](sandwichTest-library.lg)
+[sandwichTest-library-Help.lg](sandwichTest-library-Help.lg)
+
 # chooseEnumEntity(property)
 - ```
 ${askHelp()}
@@ -9,5 +12,3 @@ Please choose a value for ${name(property)} from [${join(foreach(turn.dialogEven
 
 # choosePropertyEntity(property)
 - "${property.entity.text}" as ${name(property.property)}
-[sandwichTest-library.lg](sandwichTest-library.lg)
-[sandwichTest-library-Help.lg](sandwichTest-library-Help.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-library-Help.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-library-Help.en-us.lg
index e8f0f2c65..fc22b3e5f 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-library-Help.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-library-Help.en-us.lg
@@ -1,3 +1,5 @@
+[sandwichTest-library.lg](sandwichTest-library.lg)
+
 # askHelp
 - IF: ${$retries > 0 && $lastIntent != 'Help'}
 - ${join(foreach($expectedProperties, expected, help1(expected)), '\n')}
@@ -25,4 +27,3 @@ You can find out about a specific property by doing 'help <property>'.
 - Enter any string for ${name(property)}
 - ELSE:
 - No help available.
-[sandwichTest-library.lg](sandwichTest-library.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-library-Missing.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-library-Missing.en-us.lg
index 4389defca..0e2f5425a 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-library-Missing.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-library-Missing.en-us.lg
@@ -1,3 +1,6 @@
+[sandwichTest-library.lg](sandwichTest-library.lg)
+[sandwichTest-library-Help.lg](sandwichTest-library-Help.lg)
+
 # askEnum(property)
 - ```
 ${askHelp()}
@@ -25,5 +28,3 @@ Enter a value for ${name(property)}
 ${askHelp()}
 Enter a value for ${name(property)}: true or false
 ```
-[sandwichTest-library.lg](sandwichTest-library.lg)
-[sandwichTest-library-Help.lg](sandwichTest-library-Help.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-library-ReadForm.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-library-ReadForm.en-us.lg
index af73f90dd..3afa5b823 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-library-ReadForm.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-library-ReadForm.en-us.lg
@@ -1,3 +1,5 @@
+[sandwichTest-library.lg](sandwichTest-library.lg)
+
 # readForm(name)
 [Activity
     Attachments=${json(formCard(name))}
@@ -49,4 +51,3 @@
 
 # subFact(property, subproperty)
 - ${dialog[property][subproperty]}
-[sandwichTest-library.lg](sandwichTest-library.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-library.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-library.en-us.lg
index 7dcf02e7e..08cbb9f7c 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-library.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/sandwich/en-us/sandwichTest-library.en-us.lg
@@ -1,3 +1,5 @@
+[sandwichTest-library-PROPERTYName.lg](sandwichTest-library-PROPERTYName.lg)
+
 > This file contains the generic templates to use for properties of particular types.
 
 # welcome
@@ -46,4 +48,3 @@
 
 # notUnderstood
 - Sorry, I do not understand ${join(foreach(turn.unrecognizedtext, chunk, concat("'", chunk, "'")), ' or ')}
-[sandwichTest-library-PROPERTYName.lg](sandwichTest-library-PROPERTYName.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Age.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Age.en-us.lg
index afa16646f..378af55d1 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Age.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Age.en-us.lg
@@ -1,4 +1,5 @@
-
+[unittests-library.lg](unittests-library.lg)
+[unittests-library-Missing.lg](unittests-library-Missing.lg)
 
 # AskAge
 - ${askString('Age')}
@@ -6,5 +7,3 @@
 
 # AgeName
 - age
-[unittests-library.lg](unittests-library.lg)
-[unittests-library-Missing.lg](unittests-library-Missing.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Datetimev2.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Datetimev2.en-us.lg
index b46e08e99..d82ec644c 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Datetimev2.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Datetimev2.en-us.lg
@@ -1,4 +1,5 @@
-
+[unittests-library.lg](unittests-library.lg)
+[unittests-library-Missing.lg](unittests-library-Missing.lg)
 
 # AskDatetimev2
 - ${askString('Datetimev2')}
@@ -6,5 +7,3 @@
 
 # Datetimev2Name
 - datetimev2
-[unittests-library.lg](unittests-library.lg)
-[unittests-library-Missing.lg](unittests-library-Missing.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Dimension.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Dimension.en-us.lg
index 17296d9d3..f9d8a90fe 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Dimension.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Dimension.en-us.lg
@@ -1,4 +1,5 @@
-
+[unittests-library.lg](unittests-library.lg)
+[unittests-library-Missing.lg](unittests-library-Missing.lg)
 
 # AskDimension
 - ${askString('Dimension')}
@@ -6,5 +7,3 @@
 
 # DimensionName
 - dimension
-[unittests-library.lg](unittests-library.lg)
-[unittests-library-Missing.lg](unittests-library-Missing.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Email.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Email.en-us.lg
index 54bca047f..3df547a0d 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Email.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Email.en-us.lg
@@ -1,4 +1,6 @@
-
+[unittests-EmailEntity.lg](unittests-EmailEntity.lg)
+[unittests-library.lg](unittests-library.lg)
+[unittests-library-Missing.lg](unittests-library-Missing.lg)
 
 # AskEmail
 - ${askString('Email')}
@@ -10,6 +12,3 @@
 
 # Email(val)
 - ${EmailEntity(val)}
-[unittests-EmailEntity.lg](unittests-EmailEntity.lg)
-[unittests-library.lg](unittests-library.lg)
-[unittests-library-Missing.lg](unittests-library-Missing.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Enum1.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Enum1.en-us.lg
index 001e18abb..2a8ad4623 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Enum1.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Enum1.en-us.lg
@@ -1,4 +1,6 @@
-
+[unittests-Enum1Entity.lg](unittests-Enum1Entity.lg)
+[unittests-library.lg](unittests-library.lg)
+[unittests-library-Missing.lg](unittests-library-Missing.lg)
 
 # AskEnum1
 - ${askEnum('Enum1')}
@@ -10,6 +12,3 @@
 
 # Enum1(val)
 - ${Enum1Entity(val)}
-[unittests-Enum1Entity.lg](unittests-Enum1Entity.lg)
-[unittests-library.lg](unittests-library.lg)
-[unittests-library-Missing.lg](unittests-library-Missing.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Enum1Entity.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Enum1Entity.en-us.lg
index 261b978c3..c467d3492 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Enum1Entity.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Enum1Entity.en-us.lg
@@ -1,4 +1,5 @@
-
+[unittests-library.lg](unittests-library.lg)
+[unittests-library-Choose.lg](unittests-library-Choose.lg)
  
  # Enum1Entity(value) 
  - SWITCH: ${value}
@@ -16,5 +17,3 @@
  
  # chooseEnum1Entity
  - ${chooseEnumEntity('Enum1')}
-[unittests-library.lg](unittests-library.lg)
-[unittests-library-Choose.lg](unittests-library-Choose.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Enum2.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Enum2.en-us.lg
index bd9d2d4a6..76e961e97 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Enum2.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Enum2.en-us.lg
@@ -1,4 +1,6 @@
-
+[unittests-Enum2Entity.lg](unittests-Enum2Entity.lg)
+[unittests-library.lg](unittests-library.lg)
+[unittests-library-Missing.lg](unittests-library-Missing.lg)
 
 # AskEnum2
 - ${askEnum('Enum2')}
@@ -10,6 +12,3 @@
 
 # Enum2(val)
 - ${Enum2Entity(val)}
-[unittests-Enum2Entity.lg](unittests-Enum2Entity.lg)
-[unittests-library.lg](unittests-library.lg)
-[unittests-library-Missing.lg](unittests-library-Missing.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Enum2Entity.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Enum2Entity.en-us.lg
index 18e3ed7ae..7f5fd7800 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Enum2Entity.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Enum2Entity.en-us.lg
@@ -1,4 +1,5 @@
-
+[unittests-library.lg](unittests-library.lg)
+[unittests-library-Choose.lg](unittests-library-Choose.lg)
  
  # Enum2Entity(value) 
  - SWITCH: ${value}
@@ -24,5 +25,3 @@
  
  # chooseEnum2Entity
  - ${chooseEnumEntity('Enum2')}
-[unittests-library.lg](unittests-library.lg)
-[unittests-library-Choose.lg](unittests-library-Choose.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Geographyv2.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Geographyv2.en-us.lg
index 736925aea..e061695ca 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Geographyv2.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Geographyv2.en-us.lg
@@ -1,4 +1,5 @@
-
+[unittests-library.lg](unittests-library.lg)
+[unittests-library-Missing.lg](unittests-library-Missing.lg)
 
 # AskGeographyv2
 - ${askString('Geographyv2')}
@@ -6,5 +7,3 @@
 
 # Geographyv2Name
 - geographyv2
-[unittests-library.lg](unittests-library.lg)
-[unittests-library-Missing.lg](unittests-library-Missing.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Keyphraseproperty.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Keyphraseproperty.en-us.lg
index 983d33c36..d708ed52e 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Keyphraseproperty.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Keyphraseproperty.en-us.lg
@@ -1,4 +1,6 @@
-
+[unittests-KeyphrasepropertyEntity.lg](unittests-KeyphrasepropertyEntity.lg)
+[unittests-library.lg](unittests-library.lg)
+[unittests-library-Missing.lg](unittests-library-Missing.lg)
 
 # AskKeyphraseproperty
 - ${askString('Keyphraseproperty')}
@@ -10,6 +12,3 @@
 
 # Keyphraseproperty(val)
 - ${KeyphrasepropertyEntity(val)}
-[unittests-KeyphrasepropertyEntity.lg](unittests-KeyphrasepropertyEntity.lg)
-[unittests-library.lg](unittests-library.lg)
-[unittests-library-Missing.lg](unittests-library-Missing.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Money.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Money.en-us.lg
index 2741ed185..b7d34823b 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Money.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Money.en-us.lg
@@ -1,4 +1,5 @@
-
+[unittests-library.lg](unittests-library.lg)
+[unittests-library-Missing.lg](unittests-library-Missing.lg)
 
 # AskMoney
 - ${askString('Money')}
@@ -6,5 +7,3 @@
 
 # MoneyName
 - money
-[unittests-library.lg](unittests-library.lg)
-[unittests-library-Missing.lg](unittests-library-Missing.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Ordinalv2.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Ordinalv2.en-us.lg
index 9dcc05787..f15b5de95 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Ordinalv2.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Ordinalv2.en-us.lg
@@ -1,4 +1,5 @@
-
+[unittests-library.lg](unittests-library.lg)
+[unittests-library-Missing.lg](unittests-library-Missing.lg)
 
 # AskOrdinalv2
 - ${askString('Ordinalv2')}
@@ -6,5 +7,3 @@
 
 # Ordinalv2Name
 - ordinalv2
-[unittests-library.lg](unittests-library.lg)
-[unittests-library-Missing.lg](unittests-library-Missing.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Percentage.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Percentage.en-us.lg
index 8a85feefd..235e4343a 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Percentage.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Percentage.en-us.lg
@@ -1,4 +1,6 @@
-
+[unittests-PercentageEntity.lg](unittests-PercentageEntity.lg)
+[unittests-library.lg](unittests-library.lg)
+[unittests-library-Missing.lg](unittests-library-Missing.lg)
 
 # AskPercentage
 - ${askString('Percentage')}
@@ -10,6 +12,3 @@
 
 # Percentage(val)
 - ${PercentageEntity(val)}
-[unittests-PercentageEntity.lg](unittests-PercentageEntity.lg)
-[unittests-library.lg](unittests-library.lg)
-[unittests-library-Missing.lg](unittests-library-Missing.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Personname.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Personname.en-us.lg
index 20398050e..8710fe3e4 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Personname.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Personname.en-us.lg
@@ -1,4 +1,6 @@
-
+[unittests-PersonnameEntity.lg](unittests-PersonnameEntity.lg)
+[unittests-library.lg](unittests-library.lg)
+[unittests-library-Missing.lg](unittests-library-Missing.lg)
 
 # AskPersonname
 - ${askString('Personname')}
@@ -10,6 +12,3 @@
 
 # Personname(val)
 - ${PersonnameEntity(val)}
-[unittests-PersonnameEntity.lg](unittests-PersonnameEntity.lg)
-[unittests-library.lg](unittests-library.lg)
-[unittests-library-Missing.lg](unittests-library-Missing.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Phonenumber.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Phonenumber.en-us.lg
index e571de1ea..102b360a5 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Phonenumber.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Phonenumber.en-us.lg
@@ -1,4 +1,6 @@
-
+[unittests-PhonenumberEntity.lg](unittests-PhonenumberEntity.lg)
+[unittests-library.lg](unittests-library.lg)
+[unittests-library-Missing.lg](unittests-library-Missing.lg)
 
 # AskPhonenumber
 - ${askString('Phonenumber')}
@@ -10,6 +12,3 @@
 
 # Phonenumber(val)
 - ${PhonenumberEntity(val)}
-[unittests-PhonenumberEntity.lg](unittests-PhonenumberEntity.lg)
-[unittests-library.lg](unittests-library.lg)
-[unittests-library-Missing.lg](unittests-library-Missing.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Quantity.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Quantity.en-us.lg
index c1bc54655..9671089bf 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Quantity.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Quantity.en-us.lg
@@ -1,4 +1,6 @@
-
+[unittests-QuantityEntity.lg](unittests-QuantityEntity.lg)
+[unittests-library.lg](unittests-library.lg)
+[unittests-library-Missing.lg](unittests-library-Missing.lg)
 
 # AskQuantity
 - ${askNumber('Quantity')}
@@ -10,6 +12,3 @@
 
 # Quantity(val)
 - ${QuantityEntity(val)}
-[unittests-QuantityEntity.lg](unittests-QuantityEntity.lg)
-[unittests-library.lg](unittests-library.lg)
-[unittests-library-Missing.lg](unittests-library-Missing.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Temperature.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Temperature.en-us.lg
index 80a266144..6056afc98 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Temperature.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Temperature.en-us.lg
@@ -1,4 +1,5 @@
-
+[unittests-library.lg](unittests-library.lg)
+[unittests-library-Missing.lg](unittests-library-Missing.lg)
 
 # AskTemperature
 - ${askString('Temperature')}
@@ -6,5 +7,3 @@
 
 # TemperatureName
 - temperature
-[unittests-library.lg](unittests-library.lg)
-[unittests-library-Missing.lg](unittests-library-Missing.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Url.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Url.en-us.lg
index 26da36cad..04638a395 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Url.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Url.en-us.lg
@@ -1,4 +1,6 @@
-
+[unittests-UrlEntity.lg](unittests-UrlEntity.lg)
+[unittests-library.lg](unittests-library.lg)
+[unittests-library-Missing.lg](unittests-library-Missing.lg)
 
 # AskUrl
 - ${askString('Url')}
@@ -10,6 +12,3 @@
 
 # Url(val)
 - ${UrlEntity(val)}
-[unittests-UrlEntity.lg](unittests-UrlEntity.lg)
-[unittests-library.lg](unittests-library.lg)
-[unittests-library-Missing.lg](unittests-library-Missing.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Utteranceproperty.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Utteranceproperty.en-us.lg
index 3d6fcc201..742515835 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Utteranceproperty.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Utteranceproperty.en-us.lg
@@ -1,4 +1,6 @@
-
+[unittests-UtterancepropertyEntity.lg](unittests-UtterancepropertyEntity.lg)
+[unittests-library.lg](unittests-library.lg)
+[unittests-library-Missing.lg](unittests-library-Missing.lg)
 
 # AskUtteranceproperty
 - ${askString('Utteranceproperty')}
@@ -10,6 +12,3 @@
 
 # Utteranceproperty(val)
 - ${UtterancepropertyEntity(val)}
-[unittests-UtterancepropertyEntity.lg](unittests-UtterancepropertyEntity.lg)
-[unittests-library.lg](unittests-library.lg)
-[unittests-library-Missing.lg](unittests-library-Missing.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Zipcodepattern.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Zipcodepattern.en-us.lg
index 4597ca18d..d1d4c3026 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Zipcodepattern.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-Zipcodepattern.en-us.lg
@@ -1,4 +1,6 @@
-
+[unittests-ZipcodepatternEntity.lg](unittests-ZipcodepatternEntity.lg)
+[unittests-library.lg](unittests-library.lg)
+[unittests-library-Missing.lg](unittests-library-Missing.lg)
 
 # AskZipcodepattern
 - ${askString('Zipcodepattern')}
@@ -10,6 +12,3 @@
 
 # Zipcodepattern(val)
 - ${ZipcodepatternEntity(val)}
-[unittests-ZipcodepatternEntity.lg](unittests-ZipcodepatternEntity.lg)
-[unittests-library.lg](unittests-library.lg)
-[unittests-library-Missing.lg](unittests-library-Missing.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-library-Assign.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-library-Assign.en-us.lg
index d4a3ff5bc..94cec34eb 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-library-Assign.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-library-Assign.en-us.lg
@@ -1,3 +1,6 @@
+[unittests-library.lg](unittests-library.lg)
+[unittests-library-ReadForm.lg](unittests-library-ReadForm.lg)
+
 # numberValidation(property, number)
 - IF: ${less(number, dialogClass.schema.properties[property].minimum)}
 - ${number} is less than the minimum value ${dialogClass.schema.properties[property].minimum}.
@@ -35,5 +38,3 @@
 
 # unexpectedPropertyChange(property, val, oldVal)
 - ${name(property)} is changed from ${value(property, oldVal)} to ${value(property, val)}.
-[unittests-library.lg](unittests-library.lg)
-[unittests-library-ReadForm.lg](unittests-library-ReadForm.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-library-Choose.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-library-Choose.en-us.lg
index e929a2008..89813450e 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-library-Choose.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-library-Choose.en-us.lg
@@ -1,3 +1,6 @@
+[unittests-library.lg](unittests-library.lg)
+[unittests-library-Help.lg](unittests-library-Help.lg)
+
 # chooseEnumEntity(property)
 - ```
 ${askHelp()}
@@ -9,5 +12,3 @@ Please choose a value for ${name(property)} from [${join(foreach(turn.dialogEven
 
 # choosePropertyEntity(property)
 - "${property.entity.text}" as ${name(property.property)}
-[unittests-library.lg](unittests-library.lg)
-[unittests-library-Help.lg](unittests-library-Help.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-library-Help.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-library-Help.en-us.lg
index c1eb793d7..e641e3f6b 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-library-Help.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-library-Help.en-us.lg
@@ -1,3 +1,5 @@
+[unittests-library.lg](unittests-library.lg)
+
 # askHelp
 - IF: ${$retries > 0 && $lastIntent != 'Help'}
 - ${join(foreach($expectedProperties, expected, help1(expected)), '\n')}
@@ -25,4 +27,3 @@ You can find out about a specific property by doing 'help <property>'.
 - Enter any string for ${name(property)}
 - ELSE:
 - No help available.
-[unittests-library.lg](unittests-library.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-library-Missing.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-library-Missing.en-us.lg
index 05c3a17c1..f6d9a2972 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-library-Missing.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-library-Missing.en-us.lg
@@ -1,3 +1,6 @@
+[unittests-library.lg](unittests-library.lg)
+[unittests-library-Help.lg](unittests-library-Help.lg)
+
 # askEnum(property)
 - ```
 ${askHelp()}
@@ -25,5 +28,3 @@ Enter a value for ${name(property)}
 ${askHelp()}
 Enter a value for ${name(property)}: true or false
 ```
-[unittests-library.lg](unittests-library.lg)
-[unittests-library-Help.lg](unittests-library-Help.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-library-ReadForm.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-library-ReadForm.en-us.lg
index c3f6cd3c9..e14da2ba3 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-library-ReadForm.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-library-ReadForm.en-us.lg
@@ -1,3 +1,5 @@
+[unittests-library.lg](unittests-library.lg)
+
 # readForm(name)
 [Activity
     Attachments=${json(formCard(name))}
@@ -49,4 +51,3 @@
 
 # subFact(property, subproperty)
 - ${dialog[property][subproperty]}
-[unittests-library.lg](unittests-library.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-library.en-us.lg b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-library.en-us.lg
index 48ee3bbea..26b008b20 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-library.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/GeneratorTests/unittests/en-us/unittests-library.en-us.lg
@@ -1,3 +1,5 @@
+[unittests-library-PROPERTYName.lg](unittests-library-PROPERTYName.lg)
+
 > This file contains the generic templates to use for properties of particular types.
 
 # welcome
@@ -46,4 +48,3 @@
 
 # notUnderstood
 - Sorry, I do not understand ${join(foreach(turn.unrecognizedtext, chunk, concat("'", chunk, "'")), ' or ')}
-[unittests-library-PROPERTYName.lg](unittests-library-PROPERTYName.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/Examples/CustomFunction.lg b/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/Examples/CustomFunction.lg
index ba7dbfd01..04b86e50a 100644
--- a/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/Examples/CustomFunction.lg
+++ b/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/Examples/CustomFunction.lg
@@ -1,7 +1,6 @@
-# template
+[import](./CustomFunctionSub.lg)
+# template
 - ${custom(1, 2)}
 
 # callRef
 - ${refSub()}
-
-[import](./CustomFunctionSub.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/Examples/import.lg b/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/Examples/import.lg
index bdc07407c..4a865b23d 100644
--- a/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/Examples/import.lg
+++ b/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/Examples/import.lg
@@ -1,7 +1,3 @@
-# basicTemplate
-- Hi
-- Hello
-
 [import](./6.lg)
 [import](6.lg)
 [import](././6.lg)
@@ -9,6 +5,11 @@
 [import](import.lg)
 [import](import/import3.lg)
 
+# basicTemplate
+- Hi
+- Hello
+
+
 # basicTemplate2
 - Hi 2
 - Hello 2
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/Examples/import2.lg b/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/Examples/import2.lg
index 3964627b8..41b36bd16 100644
--- a/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/Examples/import2.lg
+++ b/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/Examples/import2.lg
@@ -1,12 +1,12 @@
-# basicTemplate3
-- Hi
-- Hello
-
 [import](./6.lg)
 [import](6.lg)
 [import](././6.lg)
 [import](8.lg)
 
+# basicTemplate3
+- Hi
+- Hello
+
 # basicTemplate4
 - Hi 2
 - Hello 2
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/ExceptionExamples/ConditionFormatError.lg b/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/ExceptionExamples/ConditionFormatError.lg
index 0e3e53f80..134ed4486 100644
--- a/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/ExceptionExamples/ConditionFormatError.lg
+++ b/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/ExceptionExamples/ConditionFormatError.lg
@@ -10,7 +10,7 @@
 - IF: ${false}
     - hi
 
-> else should not follewed by any expressions
+> else should not be followed by any expressions
 # template3
  - IF: ${true}
     - hello
@@ -35,4 +35,4 @@
 
 # template6
 - ELSE:
- - hi
+ - hi
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/ExceptionExamples/DuplicatedTemplatesInImportFiles.lg b/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/ExceptionExamples/DuplicatedTemplatesInImportFiles.lg
index 2f1efb6ec..693bdf84b 100644
--- a/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/ExceptionExamples/DuplicatedTemplatesInImportFiles.lg
+++ b/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/ExceptionExamples/DuplicatedTemplatesInImportFiles.lg
@@ -1,9 +1,8 @@
-# basicTemplate
+[import](ImportFile.lg)
+# basicTemplate
 - Hi
 - Hello
 
-[import](ImportFile.lg)
-
 # basicTemplate2
 - Hi 2
 - Hello 2
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/ExceptionExamples/ErrorLine.lg b/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/ExceptionExamples/ErrorLine.lg
new file mode 100644
index 000000000..44f4c9d0a
--- /dev/null
+++ b/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/ExceptionExamples/ErrorLine.lg
@@ -0,0 +1,9 @@
+# hi
+[]
+- hi
+
+# foo.bar
+[
+]
+-hi
+[import]
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/ExceptionExamples/InvalidLGFileImportPath.lg b/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/ExceptionExamples/InvalidLGFileImportPath.lg
index b3d0615c5..2e53c7324 100644
--- a/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/ExceptionExamples/InvalidLGFileImportPath.lg
+++ b/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/ExceptionExamples/InvalidLGFileImportPath.lg
@@ -1,4 +1,3 @@
-# template
-- Hello
-
-[No such file Non.lg](./Non.lg)
\ No newline at end of file
+[No such file Non.lg](./Non.lg)
+# template
+- Hello
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/ExceptionExamples/MultiLineExprError.lg b/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/ExceptionExamples/MultiLineExprError.lg
index 808da55e9..61a134385 100644
--- a/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/ExceptionExamples/MultiLineExprError.lg
+++ b/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/ExceptionExamples/MultiLineExprError.lg
@@ -1,19 +1,4 @@
 #Demo
 - ${createArray(1,2
 2,3)
-[import](5.lg)
 
-#Demo2
-- ${createArray(1, 
-2,3)
-
-#Demo3
-- IF ${32.5 > 14.1 || 
-    userName == 'doskey' ||
-    day = 'Monday'
-- good day
-
-#Demo4
-- ${createArray(1, 
-2,3)
-> this is a comment
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/Microsoft.Bot.Builder.LanguageGeneration.Tests.csproj b/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/Microsoft.Bot.Builder.LanguageGeneration.Tests.csproj
index d0447876c..24a151346 100644
--- a/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/Microsoft.Bot.Builder.LanguageGeneration.Tests.csproj
+++ b/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/Microsoft.Bot.Builder.LanguageGeneration.Tests.csproj
@@ -63,6 +63,7 @@
     <None Remove="ExceptionExamples\DuplicatedTemplatesInImportFiles.lg" />
     <None Remove="ExceptionExamples\RunTimeErrors.lg" />
     <None Remove="ExceptionExamples\ExpressionFormatError.lg" />
+    <None Remove="ExceptionExamples\ErrorLine.lg" />
     <None Remove="MultiLanguage\a.lg" />
     <None Remove="MultiLanguage\a.en.lg" />
   </ItemGroup>
@@ -227,6 +228,9 @@
     <Content Include="ExceptionExamples\ExpressionFormatError.lg">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>
+    <Content Include="ExceptionExamples\ErrorLine.lg">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
     <Content Include="MultiLanguage\a.lg">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>
diff --git a/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/TemplateDiagnosticTest.cs b/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/TemplateDiagnosticTest.cs
index 03d67e4ff..838d4e618 100644
--- a/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/TemplateDiagnosticTest.cs
+++ b/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/TemplateDiagnosticTest.cs
@@ -137,11 +137,6 @@ namespace Microsoft.Bot.Builder.AI.LanguageGeneration.Tests
             Assert.AreEqual(1, diagnostics.Count);
             Assert.AreEqual(DiagnosticSeverity.Error, diagnostics[0].Severity);
             Assert.IsTrue(diagnostics[0].Message.Contains("Close } is missing in Expression"));
-
-            diagnostics = Templates.ParseText("#Demo4\r\n- ${createArray(1,\r\n2,3)\r\n#AnotherTemplate").Diagnostics;
-            Assert.AreEqual(1, diagnostics.Count);
-            Assert.AreEqual(DiagnosticSeverity.Error, diagnostics[0].Severity);
-            Assert.IsTrue(diagnostics[0].Message.Contains("Close } is missing in Expression"));
         }
 
         [TestMethod]
@@ -317,6 +312,23 @@ namespace Microsoft.Bot.Builder.AI.LanguageGeneration.Tests
             Assert.AreEqual("'dialog.abc' evaluated to null. [switchcase2] Case 'Default': Error occurred when evaluating '-I want ${dialog.abc}'.", exception.Message);
         }
 
+        [TestMethod]
+        public void TestErrorLine()
+        {
+            var diagnostics = GetDiagnostics("ErrorLine.lg");
+
+            Assert.AreEqual(4, diagnostics.Count);
+
+            Assert.AreEqual(DiagnosticSeverity.Error, diagnostics[0].Severity);
+            Assert.IsTrue(diagnostics[0].Message.Contains(TemplateErrors.SyntaxError));
+            Assert.AreEqual(DiagnosticSeverity.Error, diagnostics[1].Severity);
+            Assert.IsTrue(diagnostics[1].Message.Contains(TemplateErrors.InvalidStrucName));
+            Assert.AreEqual(DiagnosticSeverity.Error, diagnostics[2].Severity);
+            Assert.IsTrue(diagnostics[2].Message.Contains(TemplateErrors.MissingStrucEnd));
+            Assert.AreEqual(DiagnosticSeverity.Error, diagnostics[3].Severity);
+            Assert.IsTrue(diagnostics[3].Message.Contains(TemplateErrors.InvalidStrucBody));
+        }
+
         [TestMethod]
         public void TestExpressionFormatError()
         {
diff --git a/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/TemplatesTest.cs b/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/TemplatesTest.cs
index b87b58508..3deeb43f3 100644
--- a/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/TemplatesTest.cs
+++ b/tests/Microsoft.Bot.Builder.LanguageGeneration.Tests/TemplatesTest.cs
@@ -425,7 +425,7 @@ namespace Microsoft.Bot.Builder.AI.LanguageGeneration.Tests
             Assert.IsTrue(evaled == "Hi 2" || evaled == "Hello 2");
 
             // Assert 6.lg of relative path is imported from text.
-            templates = Templates.ParseText("# basicTemplate\r\n- Hi\r\n- Hello\r\n[import](./6.lg)", GetExampleFilePath("xx.lg"));
+            templates = Templates.ParseText("[import](./6.lg)\r\n# basicTemplate\r\n- Hi\r\n- Hello\r\n", GetExampleFilePath("xx.lg"));
 
             Assert.AreEqual(8, templates.AllTemplates.Count());
             evaled = templates.Evaluate("basicTemplate", null).ToString();
diff --git a/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-Bread.en-us.lg b/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-Bread.en-us.lg
index 6d7d38546..6af18ab21 100644
--- a/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-Bread.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-Bread.en-us.lg
@@ -1,4 +1,6 @@
-
+[sandwich-BreadEntity.lg](sandwich-BreadEntity.lg)
+[sandwich-library.lg](sandwich-library.lg)
+[sandwich-library-Missing.lg](sandwich-library-Missing.lg)
 
 # AskBread
 - ${askEnum('Bread')}
@@ -10,6 +12,3 @@
 
 # Bread(val)
 - ${BreadEntity(val)}
-[sandwich-BreadEntity.lg](sandwich-BreadEntity.lg)
-[sandwich-library.lg](sandwich-library.lg)
-[sandwich-library-Missing.lg](sandwich-library-Missing.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-BreadEntity.en-us.lg b/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-BreadEntity.en-us.lg
index 04625bad8..aca02e916 100644
--- a/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-BreadEntity.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-BreadEntity.en-us.lg
@@ -1,4 +1,5 @@
-
+[sandwich-library.lg](sandwich-library.lg)
+[sandwich-library-Choose.lg](sandwich-library-Choose.lg)
  
  # BreadEntity(value) 
  - SWITCH: ${value}
@@ -16,5 +17,3 @@
  
  # chooseBreadEntity
  - ${chooseEnumEntity('Bread')}
-[sandwich-library.lg](sandwich-library.lg)
-[sandwich-library-Choose.lg](sandwich-library-Choose.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-Cheese.en-us.lg b/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-Cheese.en-us.lg
index 74e04aaeb..1101768c1 100644
--- a/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-Cheese.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-Cheese.en-us.lg
@@ -1,4 +1,6 @@
-
+[sandwich-CheeseEntity.lg](sandwich-CheeseEntity.lg)
+[sandwich-library.lg](sandwich-library.lg)
+[sandwich-library-Missing.lg](sandwich-library-Missing.lg)
 
 # AskCheese
 - ${askEnum('Cheese')}
@@ -10,6 +12,3 @@
 
 # Cheese(val)
 - ${CheeseEntity(val)}
-[sandwich-CheeseEntity.lg](sandwich-CheeseEntity.lg)
-[sandwich-library.lg](sandwich-library.lg)
-[sandwich-library-Missing.lg](sandwich-library-Missing.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-CheeseEntity.en-us.lg b/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-CheeseEntity.en-us.lg
index 5ee548943..f6a2e02c2 100644
--- a/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-CheeseEntity.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-CheeseEntity.en-us.lg
@@ -1,4 +1,5 @@
-
+[sandwich-library.lg](sandwich-library.lg)
+[sandwich-library-Choose.lg](sandwich-library-Choose.lg)
  
  # CheeseEntity(value) 
  - SWITCH: ${value}
@@ -24,5 +25,3 @@
  
  # chooseCheeseEntity
  - ${chooseEnumEntity('Cheese')}
-[sandwich-library.lg](sandwich-library.lg)
-[sandwich-library-Choose.lg](sandwich-library-Choose.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-Length.en-us.lg b/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-Length.en-us.lg
index a6b923e38..ac0f6b991 100644
--- a/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-Length.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-Length.en-us.lg
@@ -1,4 +1,5 @@
-
+[sandwich-library.lg](sandwich-library.lg)
+[sandwich-library-Missing.lg](sandwich-library-Missing.lg)
 
 # AskLength
 - ${askString('Length')}
@@ -6,5 +7,3 @@
 
 # LengthName
 - length
-[sandwich-library.lg](sandwich-library.lg)
-[sandwich-library-Missing.lg](sandwich-library-Missing.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-Meat.en-us.lg b/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-Meat.en-us.lg
index 91b9652ef..9a8b693b4 100644
--- a/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-Meat.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-Meat.en-us.lg
@@ -1,4 +1,6 @@
-
+[sandwich-MeatEntity.lg](sandwich-MeatEntity.lg)
+[sandwich-library.lg](sandwich-library.lg)
+[sandwich-library-Missing.lg](sandwich-library-Missing.lg)
 
 # AskMeat
 - ${askEnum('Meat')}
@@ -10,6 +12,3 @@
 
 # Meat(val)
 - ${MeatEntity(val)}
-[sandwich-MeatEntity.lg](sandwich-MeatEntity.lg)
-[sandwich-library.lg](sandwich-library.lg)
-[sandwich-library-Missing.lg](sandwich-library-Missing.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-MeatEntity.en-us.lg b/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-MeatEntity.en-us.lg
index 8b29b4111..e9fcae7be 100644
--- a/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-MeatEntity.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-MeatEntity.en-us.lg
@@ -1,4 +1,5 @@
-
+[sandwich-library.lg](sandwich-library.lg)
+[sandwich-library-Choose.lg](sandwich-library-Choose.lg)
  
  # MeatEntity(value) 
  - SWITCH: ${value}
@@ -24,5 +25,3 @@
  
  # chooseMeatEntity
  - ${chooseEnumEntity('Meat')}
-[sandwich-library.lg](sandwich-library.lg)
-[sandwich-library-Choose.lg](sandwich-library-Choose.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-Name.en-us.lg b/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-Name.en-us.lg
index d0b299211..2c65270a3 100644
--- a/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-Name.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-Name.en-us.lg
@@ -1,4 +1,6 @@
-
+[sandwich-NameEntity.lg](sandwich-NameEntity.lg)
+[sandwich-library.lg](sandwich-library.lg)
+[sandwich-library-Missing.lg](sandwich-library-Missing.lg)
 
 # AskName
 - ${askString('Name')}
@@ -10,6 +12,3 @@
 
 # Name(val)
 - ${NameEntity(val)}
-[sandwich-NameEntity.lg](sandwich-NameEntity.lg)
-[sandwich-library.lg](sandwich-library.lg)
-[sandwich-library-Missing.lg](sandwich-library-Missing.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-Price.en-us.lg b/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-Price.en-us.lg
index 4465aefed..b8c35ed58 100644
--- a/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-Price.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-Price.en-us.lg
@@ -1,4 +1,5 @@
-
+[sandwich-library.lg](sandwich-library.lg)
+[sandwich-library-Missing.lg](sandwich-library-Missing.lg)
 
 # AskPrice
 - ${askString('Price')}
@@ -6,5 +7,3 @@
 
 # PriceName
 - price
-[sandwich-library.lg](sandwich-library.lg)
-[sandwich-library-Missing.lg](sandwich-library-Missing.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-Quantity.en-us.lg b/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-Quantity.en-us.lg
index d9bc50a37..885c107f4 100644
--- a/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-Quantity.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-Quantity.en-us.lg
@@ -1,4 +1,6 @@
-
+[sandwich-QuantityEntity.lg](sandwich-QuantityEntity.lg)
+[sandwich-library.lg](sandwich-library.lg)
+[sandwich-library-Missing.lg](sandwich-library-Missing.lg)
 
 # AskQuantity
 - ${askNumber('Quantity')}
@@ -10,6 +12,3 @@
 
 # Quantity(val)
 - ${QuantityEntity(val)}
-[sandwich-QuantityEntity.lg](sandwich-QuantityEntity.lg)
-[sandwich-library.lg](sandwich-library.lg)
-[sandwich-library-Missing.lg](sandwich-library-Missing.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-library-Assign.en-us.lg b/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-library-Assign.en-us.lg
index b2acdb676..e772e7b9c 100644
--- a/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-library-Assign.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-library-Assign.en-us.lg
@@ -1,3 +1,6 @@
+[sandwich-library.lg](sandwich-library.lg)
+[sandwich-library-ReadForm.lg](sandwich-library-ReadForm.lg)
+
 # numberValidation(property, number)
 - IF: ${less(number, dialogClass.schema.properties[property].minimum)}
 - ${number} is less than the minimum value ${dialogClass.schema.properties[property].minimum}.
@@ -35,5 +38,3 @@
 
 # unexpectedPropertyChange(property, val, oldVal)
 - ${name(property)} is changed from ${value(property, oldVal)} to ${value(property, val)}.
-[sandwich-library.lg](sandwich-library.lg)
-[sandwich-library-ReadForm.lg](sandwich-library-ReadForm.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-library-Choose.en-us.lg b/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-library-Choose.en-us.lg
index 9b7f0c7bc..245edc216 100644
--- a/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-library-Choose.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-library-Choose.en-us.lg
@@ -1,3 +1,6 @@
+[sandwich-library.lg](sandwich-library.lg)
+[sandwich-library-Help.lg](sandwich-library-Help.lg)
+
 # chooseEnumEntity(property)
 - ```
 ${askHelp()}
@@ -9,5 +12,3 @@ Please choose a value for ${name(property)} from [${join(foreach(turn.dialogEven
 
 # choosePropertyEntity(property)
 - "${property.entity.text}" as ${name(property.property)}
-[sandwich-library.lg](sandwich-library.lg)
-[sandwich-library-Help.lg](sandwich-library-Help.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-library-Help.en-us.lg b/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-library-Help.en-us.lg
index 91f5c0105..75560069c 100644
--- a/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-library-Help.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-library-Help.en-us.lg
@@ -1,3 +1,5 @@
+[sandwich-library.lg](sandwich-library.lg)
+
 # askHelp
 - IF: ${$retries > 0 && $lastIntent != 'Help'}
 - ${join(foreach($expectedProperties, expected, help1(expected)), '\n')}
@@ -25,4 +27,3 @@ You can find out about a specific property by doing 'help <property>'.
 - Enter any string for ${name(property)}
 - ELSE:
 - No help available.
-[sandwich-library.lg](sandwich-library.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-library-Missing.en-us.lg b/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-library-Missing.en-us.lg
index 22a6ca5e3..ae3a06041 100644
--- a/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-library-Missing.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-library-Missing.en-us.lg
@@ -1,3 +1,6 @@
+[sandwich-library.lg](sandwich-library.lg)
+[sandwich-library-Help.lg](sandwich-library-Help.lg)
+
 # askEnum(property)
 - ```
 ${askHelp()}
@@ -25,5 +28,3 @@ Enter a value for ${name(property)}
 ${askHelp()}
 Enter a value for ${name(property)}: true or false
 ```
-[sandwich-library.lg](sandwich-library.lg)
-[sandwich-library-Help.lg](sandwich-library-Help.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-library-ReadForm.en-us.lg b/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-library-ReadForm.en-us.lg
index afefcd54a..cc1baab49 100644
--- a/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-library-ReadForm.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-library-ReadForm.en-us.lg
@@ -1,3 +1,5 @@
+[sandwich-library.lg](sandwich-library.lg)
+
 # readForm(name)
 [Activity
     Attachments=${json(formCard(name))}
@@ -49,4 +51,3 @@
 
 # subFact(property, subproperty)
 - ${dialog[property][subproperty]}
-[sandwich-library.lg](sandwich-library.lg)
\ No newline at end of file
diff --git a/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-library.en-us.lg b/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-library.en-us.lg
index 88b550f5f..889e9e6a4 100644
--- a/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-library.en-us.lg
+++ b/tests/Microsoft.Bot.Builder.TestBot.Json/Samples/sandwich/en-us/sandwich-library.en-us.lg
@@ -1,4 +1,5 @@
 > This file contains the generic templates to use for properties of particular types.
+[sandwich-library-PROPERTYName.lg](sandwich-library-PROPERTYName.lg)
 
 # welcome
 - Welcome!
@@ -46,4 +47,3 @@
 
 # notUnderstood
 - Sorry, I do not understand ${join(foreach(turn.unrecognizedtext, chunk, concat("'", chunk, "'")), ' or ')}
-[sandwich-library-PROPERTYName.lg](sandwich-library-PROPERTYName.lg)
\ No newline at end of file