From fbcba4edf27a45f6406edd78024e7e20af8516f8 Mon Sep 17 00:00:00 2001
From: Alexander Luzgarev <mahalex@gmail.com>
Date: Wed, 4 Apr 2018 10:44:44 +0200
Subject: [PATCH] Parse tilde in function input description

---
 Parser.Tests/MParserShould.cs | 13 +++++++++++++
 Parser/MParser.cs             | 12 ++++++++++--
 2 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/Parser.Tests/MParserShould.cs b/Parser.Tests/MParserShould.cs
index 5ceeda8..c2b8b44 100644
--- a/Parser.Tests/MParserShould.cs
+++ b/Parser.Tests/MParserShould.cs
@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Linq;
 using Lexer;
 
 using NUnit.Framework;
@@ -400,5 +401,17 @@ namespace Parser.Tests
             Assert.IsInstanceOf<UnaryPrefixOperationExpressionNode>(f.Elements.Elements[1]);
             Assert.AreEqual(text, actual.FullText);
         }
+
+        [Test]
+        public void ParseTildeAsFunctionInputReplacement()
+        {
+            var text = "function a(b, ~, c) end";
+            var sut = CreateParser(text);
+            var actual = sut.ParseStatement();
+            Assert.IsInstanceOf<FunctionDeclarationNode>(actual);
+            var f = (FunctionDeclarationNode) actual;
+            Assert.AreEqual(3, f.InputDescription.Parameters.Parameters.Count);
+            CollectionAssert.AreEqual(new[] { "b", "~", "c" }, f.InputDescription.Parameters.Parameters.Select(p => (p as TokenNode).Token.PureToken.LiteralText));
+        }
     }
 }
\ No newline at end of file
diff --git a/Parser/MParser.cs b/Parser/MParser.cs
index a9fb988..2ab4a01 100644
--- a/Parser/MParser.cs
+++ b/Parser/MParser.cs
@@ -181,10 +181,18 @@ namespace Parser
                     identifierTokens.Add(EatToken(TokenKind.Comma));
                 }
 
-                identifierTokens.Add(EatToken(TokenKind.Identifier));
+                if (CurrentToken.Kind == TokenKind.Not)
+                {
+                    var notToken = EatToken();
+                    identifierTokens.Add(notToken);
+                }
+                else
+                {
+                    identifierTokens.Add(EatToken(TokenKind.Identifier));
+                }
             }
 
-            return Factory.ParameterList(identifierTokens.Select(token => new TokenNode(token) as SyntaxNode).ToList());
+            return Factory.ParameterList(identifierTokens.Select(token => Factory.Token(token) as SyntaxNode).ToList());
         }
 
         private FunctionInputDescriptionNode ParseFunctionInputDescription()