fItemPlugin.ItemRules.Core.Parser.ParseAddExpr C# (CSharp) Метод

        private void ParseAddExpr(ParseNode parent)
        {
            Token tok;
            ParseNode n;
            ParseNode node = parent.CreateNode(scanner.GetToken(TokenType.AddExpr), "AddExpr");
            parent.Nodes.Add(node);

            ParseMultExpr(node);

            tok = scanner.LookAhead(TokenType.PLUS, TokenType.MINUS);
            while (tok.Type == TokenType.PLUS
                || tok.Type == TokenType.MINUS)
            {

                tok = scanner.LookAhead(TokenType.PLUS, TokenType.MINUS);
                switch (tok.Type)
                {
                    case TokenType.PLUS:
                        tok = scanner.Scan(TokenType.PLUS);
                        n = node.CreateNode(tok, tok.ToString());
                        node.Token.UpdateRange(tok);
                        node.Nodes.Add(n);
                        if (tok.Type != TokenType.PLUS)
                        {
                            tree.Errors.Add(new ParseError("Unexpected token '" + tok.Text.Replace("\n", "") + "' found. Expected " + TokenType.PLUS.ToString(), 0x1001, 0, tok.StartPos, tok.StartPos, tok.Length));
                            return;
                        }
                        break;
                    case TokenType.MINUS:
                        tok = scanner.Scan(TokenType.MINUS);
                        n = node.CreateNode(tok, tok.ToString());
                        node.Token.UpdateRange(tok);
                        node.Nodes.Add(n);
                        if (tok.Type != TokenType.MINUS)
                        {
                            tree.Errors.Add(new ParseError("Unexpected token '" + tok.Text.Replace("\n", "") + "' found. Expected " + TokenType.MINUS.ToString(), 0x1001, 0, tok.StartPos, tok.StartPos, tok.Length));
                            return;
                        }
                        break;
                    default:
                        tree.Errors.Add(new ParseError("Unexpected token '" + tok.Text.Replace("\n", "") + "' found.", 0x0002, 0, tok.StartPos, tok.StartPos, tok.Length));
                        break;
                }

                ParseMultExpr(node);
                tok = scanner.LookAhead(TokenType.PLUS, TokenType.MINUS);
            }

            parent.Token.UpdateRange(node.Token);
        }