EpplusFormulaParser/LexicalAnalysis/TokenFactory.cs

/*******************************************************************************
 * You may amend and distribute as you like, but don't remove this header!
 *
 * EPPlus provides server-side generation of Excel 2007/2010 spreadsheets.
 * See http://www.codeplex.com/EPPlus for details.
 *
 * Copyright (C) 2011  Jan Källman
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.

 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Lesser General Public License for more details.
 *
 * The GNU Lesser General Public License can be viewed at http://www.opensource.org/licenses/lgpl-license.php
 * If you unfamiliar with this license or have questions about it, here is an http://www.gnu.org/licenses/gpl-faq.html
 *
 * All code and executables are provided "as is" with no warranty either express or implied.
 * The author accepts no liability for any damage or loss of business that this product may cause.
 *
 * Code change notes:
 *
 * Author							Change						Date
 * ******************************************************************************
 * Mats Alm   		                Added       		        2013-03-01 (Prior file history on https://github.com/swmal/ExcelFormulaParser)
 * Jan Källman                      Replaced Adress validate    2013-03-01
 * *******************************************************************************/

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text.RegularExpressions;

namespace EpplusFormulaParser;

internal static partial class TokenFactory {
  public static Token Create(List<Token> tokens, string token) {
    if (TokenSeparatorProvider.Tokens.TryGetValue(token, out var tokenSeparator)) {
      return tokenSeparator;
    }
    var tokenList = (IList<Token>)tokens;
    //Address with worksheet-string before  /JK
    if (token.StartsWith('!') && tokenList[^1].TokenType == TokenType.String) {
      var i = tokenList.Count - 2;
      if (i > 0) {
        string addr;
        if (tokenList[i].TokenType == TokenType.StringContent) {
          addr = "'" + tokenList[i].Value.Replace("'", "''") + "'";
        } else {
          throw new ArgumentException($"Invalid formula token sequence near {token}");
        }
        //Remove the string tokens and content
        tokenList.RemoveAt(tokenList.Count - 1);
        tokenList.RemoveAt(tokenList.Count - 1);
        tokenList.RemoveAt(tokenList.Count - 1);

        return new(addr + token, TokenType.ExcelAddress);
      }
      throw new ArgumentException($"Invalid formula token sequence near {token}");
    }

    if (tokens.Count != 0 && tokens.Last().TokenType == TokenType.String) {
      return new(token, TokenType.StringContent);
    }
    if (!string.IsNullOrEmpty(token)) {
      token = token.Trim();
    }
    if (DecimalRegex().IsMatch(token)) {
      return new(token, TokenType.Decimal);
    }
    if (IntegerRegex().IsMatch(token)) {
      return new(token, TokenType.Integer);
    }
    if (BooleanRegex().IsMatch(token)) {
      return new(token, TokenType.Boolean);
    }
    if (token.Contains("#REF!", StringComparison.InvariantCultureIgnoreCase)) {
      return new(token, TokenType.InvalidReference);
    }
    if (token.Equals("#NUM!", StringComparison.InvariantCultureIgnoreCase)) {
      return new(token, TokenType.NumericError);
    }
    if (token.Equals("#VALUE!", StringComparison.InvariantCultureIgnoreCase)) {
      return new(token, TokenType.ValueDataTypeError);
    }
    if (token.Equals("#NULL!", StringComparison.InvariantCultureIgnoreCase)) {
      return new(token, TokenType.Null);
    }
    if (FunctionRepository.IsFunctionName(token)) {
      return new(token, TokenType.Function);
    }
    if (tokenList.Count > 0 && tokenList[^1].TokenType == TokenType.OpeningEnumerable) {
      return new(token, TokenType.Enumerable);
    }
    var at = ExcelAddressUtilities.IsValid(token);
    if (at == ExcelAddressUtilities.AddressType.InternalAddress) {
      return new(token.ToUpper(CultureInfo.InvariantCulture), TokenType.ExcelAddress);
    }
    return new(token, TokenType.Unrecognized);
  }

  [GeneratedRegex(@"^[0-9]+\.[0-9]+$")]
  private static partial Regex DecimalRegex();

  [GeneratedRegex("^[0-9]+$")]
  private static partial Regex IntegerRegex();

  [GeneratedRegex("^(true|false)$", RegexOptions.IgnoreCase)]
  private static partial Regex BooleanRegex();
}