fix 2 special cases of method invocation

--HG--
branch : dev

src/Orchard.Tests.Modules/SimpleScripting/EvaluatorTests.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
+using System.Linq;
 using NUnit.Framework;
 using Orchard.Widgets.SimpleScripting.Compiler;
 
@@ -18,7 +19,6 @@ namespace Orchard.Tests.Modules.SimpleScripting {
         public void EvaluateInvalidBooleanExpression() {
             var result = EvaluateSimpleExpression("true and 1");
             Assert.That(result.IsError, Is.True);
-            Trace.WriteLine(string.Format("Evaluation error: {0}", result.Error.Message));
         }
 
         [Test]
@@ -63,6 +63,22 @@ namespace Orchard.Tests.Modules.SimpleScripting {
             Assert.That(result.Value, Is.EqualTo(2 + 3));
         }
 
+        [Test]
+        public void EvaluateSimpleMethodCall4() {
+            var result = EvaluateSimpleExpression("foo",
+                (m, args) => (m == "foo") ? true : false);
+            Assert.That(result.IsError, Is.False);
+            Assert.That(result.Value, Is.EqualTo(true));
+        }
+
+        [Test]
+        public void EvaluateSimpleMethodCall5() {
+            var result = EvaluateSimpleExpression("foo()",
+                (m, args) => (m == "foo") ? true : false);
+            Assert.That(result.IsError, Is.False);
+            Assert.That(result.Value, Is.EqualTo(true));
+        }
+
         private EvaluationResult EvaluateSimpleExpression(string expression) {
             return EvaluateSimpleExpression(expression, (m, args) => null);
         }
@@ -71,10 +87,15 @@ namespace Orchard.Tests.Modules.SimpleScripting {
             string expression, Func<string, IList<object>, object> methodInvocationCallback) {
 
             var ast = new Parser(expression).Parse();
+            foreach(var error in ast.GetErrors()) {
+                Trace.WriteLine(string.Format("Error during parsing of '{0}': {1}", expression, error.Message));
+            }
+            Assert.That(ast.GetErrors().Any(), Is.False);
             var result = new Interpreter().Evalutate(new EvaluationContext {
                 Tree = ast,
                 MethodInvocationCallback = methodInvocationCallback
             });
+            Trace.WriteLine(string.Format("Result of evaluation of '{0}': {1}", expression, result));
             return result;
         }
     }

src/Orchard.Web/Modules/Orchard.Widgets/SimpleScripting/Compiler/Parser.cs

@@ -129,10 +129,18 @@ namespace Orchard.Widgets.SimpleScripting.Compiler {
             var target = _lexer.Token();
             _lexer.NextToken();
 
-            bool hasParenthesis = (IsMatch(TokenKind.OpenParen) != null);
+            bool isParenthesizedCall = (IsMatch(TokenKind.OpenParen) != null);
 
             var arguments = new List<AstNode>();
             while (true) {
+                // Special case: we might reach the end of the token stream
+                if (_lexer.Token().Kind == TokenKind.Eof)
+                    break;
+
+                // Special case: we must support "foo()"
+                if (isParenthesizedCall && _lexer.Token().Kind == TokenKind.CloseParen)
+                    break;
+
                 var argument = ParseExpression();
                 arguments.Add(argument);
 
@@ -140,7 +148,7 @@ namespace Orchard.Widgets.SimpleScripting.Compiler {
                     break;
             }
 
-            if (hasParenthesis)
+            if (isParenthesizedCall)
                 Match(TokenKind.CloseParen);
 
             return new MethodCallAstNode(target, arguments);