src/Boo.Lang.Compiler/TypeSystem/Ambiguous.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         using System;
  32         using System.Collections;
  33         using System.Collections.Generic;
  34
  35         public delegate bool EntityPredicate(IEntity entity);
  36
  37         public class Ambiguous : IEntity
  38         {
  39                 public static readonly IEntity[] NoEntities = new IEntity[0];
  40
  41                 private IEntity[] _entities;
  42
  43                 public Ambiguous(IList entities) : this(ToArray(entities))
  44                 {
  45                 }
  46
  47                 public Ambiguous(IEntity[] entities)
  48                 {
  49                         if (null == entities) throw new ArgumentNullException("entities");
  50                         if (0 == entities.Length) throw new ArgumentException("entities");
  51                         _entities = entities;
  52                 }
  53
  54                 public string Name
  55                 {
  56                         get { return _entities[0].Name; }
  57                 }
  58
  59                 public string FullName
  60                 {
  61                         get { return _entities[0].FullName; }
  62                 }
  63
  64                 public EntityType EntityType
  65                 {
  66                         get { return EntityType.Ambiguous; }
  67                 }
  68
  69                 public IEntity[] Entities
  70                 {
  71                         get { return _entities; }
  72                 }
  73
  74                 public List<IEntity> Select(EntityPredicate predicate)
  75                 {
  76                         List<IEntity> found = new List<IEntity>();
  77                         foreach (IEntity entity in _entities)
  78                         {
  79                                 if (predicate(entity)) found.Add(entity);
  80                         }
  81                         return found;
  82                 }
  83
  84                 override public string ToString()
  85                 {
  86                         return string.Format("Ambiguous({0})", Builtins.join(_entities, ", "));
  87                 }
  88
  89                 private static IEntity[] ToArray(IList entities)
  90                 {
  91                         if (entities.Count == 0) return NoEntities;
  92                         IEntity[] array = new IEntity[entities.Count];
  93                         entities.CopyTo(array, 0);
  94                         return array;
  95                 }
  96
  97                 public bool AllEntitiesAre(EntityType entityType)
  98                 {
  99                         foreach (IEntity entity in _entities)
 100                         {
 101                                 if (entityType != entity.EntityType) return false;
 102                         }
 103                         return true;
 104                 }
 105
 106                 public bool Any(EntityPredicate predicate)
 107                 {
 108                         foreach (IEntity entity in _entities)
 109                         {
 110                                 if (predicate(entity)) return true;
 111                         }
 112                         return false;
 113                 }
 114         }
 115 }