IronPython.Compiler.Parser.ParseFuncDef C# (CSharp) Метод

        private FunctionDefinition ParseFuncDef() {
            Eat(TokenKind.KeywordDef);
            var start = GetStart();
            string name = ReadName();

            Eat(TokenKind.LeftParenthesis);

            var lStart = GetStart();
            var lEnd = GetEnd();
            int grouping = _tokenizer.GroupingLevel;

            Parameter[] parameters = ParseVarArgsList(TokenKind.RightParenthesis);
            FunctionDefinition ret;
            if (parameters == null) {
                // error in parameters
                ret = new FunctionDefinition(name, new Parameter[0]);
                ret.SetLoc(_globalParent, start, lEnd);
                return ret;
            }

            var rStart = GetStart();
            var rEnd = GetEnd();

            ret = new FunctionDefinition(name, parameters);
            PushFunction(ret);


            Statement body = ParseClassOrFuncBody();
            FunctionDefinition ret2 = PopFunction();
            System.Diagnostics.Debug.Assert(ret == ret2);

            ret.Body = body;
            ret.HeaderIndex = rEnd;

            if (_sink != null) {
                _sink.MatchPair(
                    new SourceSpan(_tokenizer.IndexToLocation(lStart), _tokenizer.IndexToLocation(lEnd)), 
                    new SourceSpan(_tokenizer.IndexToLocation(rStart), _tokenizer.IndexToLocation(rEnd)), 
                    grouping
                );
            }

            ret.SetLoc(_globalParent, start, body.EndIndex);

            return ret;
        }