#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2013 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
 *
 * This file is part of HeuristicLab.
 *
 * HeuristicLab is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * HeuristicLab 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
 */
#endregion

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

public class Util {
  // simplistic regex for formal parameters, any string of non-whitespace and not comma characters is allowed as a type name
  // this has to be changed to allow for e.g., generic types (S<T0, T1>) and for expressions in actual parameters (max(x, 0) + 1))
  private static string refOrOutGroup = @"(?:(?<refOrOut>(out|ref))\s+)"; // "ref " | "out "
  private static string typeGroup = @"(?:(?<type>[^,]+)\s+)";
  private static string identGroup = @"(?:(?<id>[^,]+)\s*)";
  private static Regex formalParameterExpr = new Regex(@"\s*,?\s*" + refOrOutGroup + "?" + typeGroup + "?" + identGroup, RegexOptions.ECMAScript);
  public static IEnumerable<TerminalNode.FieldDefinition> ExtractParameters(string formalParameterSrc) {

    var matches = formalParameterExpr.Matches(formalParameterSrc);

    foreach (var m in matches.OfType<Match>()) {
      yield return new TerminalNode.FieldDefinition(m.Groups["refOrOut"].Value, m.Groups["type"].Value, m.Groups["id"].Value);
    }
  }
}