Support multiple lines Expression in LG file

libraries/botbuilder-lg/src/LGFileLexer.g4

@@ -46,7 +46,7 @@ fragment STRING_LITERAL : ('\'' (~['\r\n])* '\'') | ('"' (~["\r\n])* '"');
 
 fragment STRING_INTERPOLATION : '`' ('\\`' | ~'`')* '`';
 
-fragment EXPRESSION_FRAGMENT : '$' '{' (STRING_LITERAL | STRING_INTERPOLATION | EMPTY_OBJECT | ~[\r\n{}'"`] )+ '}'?;
+fragment EXPRESSION_FRAGMENT : '$' '{' (STRING_LITERAL | STRING_INTERPOLATION | EMPTY_OBJECT | ~[}'"`] )+ '}'?;
 
 fragment ESCAPE_CHARACTER_FRAGMENT : '\\' ~[\r\n]?;
 

libraries/botbuilder-lg/tests/lg.test.js

@@ -54,6 +54,21 @@ describe('LG', function() {
         assert.strictEqual(evaled === 'Good evening' || evaled === 'Evening! ', true, `Evaled is ${ evaled }`);
     });
 
+    it('TestMultiLineExprLG', function() {
+        let templates = Templates.parseFile(GetExampleFilePath('MultiLineExpr.lg'));
+
+        let evaled = templates.evaluate('ExprInCondition', { userName: 'Henry', day: 'Monday' });
+        assert.strictEqual(evaled === 'Not today', true, `Evaled is ${ evaled }`);
+
+        evaled = templates.evaluate('definition');
+        assert.strictEqual(evaled, 10);
+
+        evaled = templates.evaluate('template');
+        assert.strictEqual(evaled, '15');
+
+
+    });
+
     it('TestBasicConditionalTemplateWithoutDefault', function() {
         let templates = Templates.parseFile(GetExampleFilePath('5.lg'));
 

libraries/botbuilder-lg/tests/lgDiagnostic.test.js

@@ -242,4 +242,22 @@ it(`TestExpressionFormatError`, function() {
     var diagnostics = GetDiagnostics(`ExpressionFormatError.lg`);
     assert.strictEqual(diagnostics.length, 1);
     assert.strictEqual(diagnostics[0].message.includes(`Close } is missing in Expression`), true);
+});
+
+it(`TestMultiLineExpressionInLG`, function() {
+    var diagnostics = GetDiagnostics(`MultiLineExprError.lg`);
+    assert.strictEqual(diagnostics.length, 1);
+    assert.strictEqual(diagnostics[0].message.includes(`Close } is missing in Expression`), true);
+
+    diagnostics = Templates.parseText('#Demo2\r\n- ${createArray(1,\r\n, 2,3)').diagnostics;
+    assert.strictEqual(diagnostics.length, 1);
+    assert.strictEqual(diagnostics[0].message.includes(`Close } is missing in Expression`), true);
+
+    diagnostics = Templates.parseText('#Demo4\r\n- ${createArray(1,\r\n2,3)\r\n> this is a comment').diagnostics;
+    assert.strictEqual(diagnostics.length, 1);
+    assert.strictEqual(diagnostics[0].message.includes(`Close } is missing in Expression`), true);
+
+    diagnostics = Templates.parseText('#Demo4\r\n- ${createArray(1,\r\n2,3)\r\n#AnotherTemplate').diagnostics;
+    assert.strictEqual(diagnostics.length, 1);
+    assert.strictEqual(diagnostics[0].message.includes(`Close } is missing in Expression`), true);
 });

libraries/botbuilder-lg/tests/testData/examples/MultiLineExpr.lg

@@ -0,0 +1,26 @@
+>Demo How LG can evalute a multiple line defined expression
+#definition
+- ${count(concat('hello',
+'world'))}
+
+# definition2
+- this is book list: ${join(createArray("Ender's Game", 
+"Dune")
+, ", ")}
+
+#ExprInCondition
+- IF: ${userName.length < 5 || 
+    day == "Monday"}
+- Not today
+-ELSE:
+- Nice Try
+
+#template 
+-${sum(
+createArray(
+1,
+2,
+3,
+4,
+5)
+)}

libraries/botbuilder-lg/tests/testData/exceptionExamples/MultiLineExprError.lg

@@ -0,0 +1,19 @@
+#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