src/Boo.Lang.Compiler/TypeSystem/INameSpace.cs

   1 #region license
   2 // Copyright (c) 2004, Rodrigo B. de Oliveira (rbo@acm.org)
   3 // All rights reserved.
   4 //
   5 // Redistribution and use in source and binary forms, with or without modification,
   6 // are permitted provided that the following conditions are met:
   7 //
   8 //     * Redistributions of source code must retain the above copyright notice,
   9 //     this list of conditions and the following disclaimer.
  10 //     * Redistributions in binary form must reproduce the above copyright notice,
  11 //     this list of conditions and the following disclaimer in the documentation
  12 //     and/or other materials provided with the distribution.
  13 //     * Neither the name of Rodrigo B. de Oliveira nor the names of its
  14 //     contributors may be used to endorse or promote products derived from this
  15 //     software without specific prior written permission.
  16 //
  17 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
  18 // ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  19 // WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  20 // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
  21 // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22 // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  23 // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  24 // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  25 // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26 // THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27 #endregion
  28
  29 namespace Boo.Lang.Compiler.TypeSystem
  30 {
  31         /// <summary>
  32         /// A namespace.
  33         /// </summary>
  34         public interface INamespace
  35         {
  36                 /// <summary>
  37                 /// The parent namespace.
  38                 /// </summary>
  39                 INamespace ParentNamespace
  40                 {
  41                         get;
  42                 }
  43
  44                 /// <summary>
  45                 /// Resolves the name passed as argument to the appropriate elements
  46                 /// in the namespace, all elements with the specified name must be
  47                 /// added to the targetList.
  48                 /// </summary>
  49                 /// <param name="targetList">list where to put the found elements</param>
  50                 /// <param name="name">name of the desired elements</param>
  51                 /// <param name="filter">element filter</param>
  52                 /// <returns>
  53                 /// true if at least one element was added to the targetList, false
  54                 /// otherwise.
  55                 /// </returns>
  56                 bool Resolve(List targetList, string name, EntityType filter);
  57
  58                 /// <summary>
  59                 /// Returns all members of this namespace.
  60                 /// </summary>
  61                 IEntity[] GetMembers();
  62         }
  63
  64         public class NullNamespace : INamespace
  65         {
  66                 public static readonly INamespace Default = new NullNamespace();
  67
  68                 public static readonly IEntity[] EmptyEntityArray = new IEntity[0];
  69
  70                 private NullNamespace()
  71                 {
  72                 }
  73
  74                 public INamespace ParentNamespace
  75                 {
  76                         get
  77                         {
  78                                 return null;
  79                         }
  80                 }
  81
  82                 public bool Resolve(List targetList, string name, EntityType flags)
  83                 {
  84                         return false;
  85                 }
  86
  87                 public IEntity[] GetMembers()
  88                 {
  89                         return NullNamespace.EmptyEntityArray;
  90                 }
  91         }
  92 }