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source: stable/HeuristicLab.Encodings.SymbolicExpressionTreeEncoding/3.4/Grammars/SymbolicExpressionTreeGrammar.cs @ 17106

Last change on this file since 17106 was 17097, checked in by mkommend, 5 years ago

#2520: Merged 16565 - 16579 into stable.

File size: 4.3 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2019 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
4 *
5 * This file is part of HeuristicLab.
6 *
7 * HeuristicLab is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * HeuristicLab is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
19 */
20#endregion
21
22using System;
23using System.Collections.Generic;
24using HeuristicLab.Common;
25using HEAL.Attic;
26
27namespace HeuristicLab.Encodings.SymbolicExpressionTreeEncoding {
28  [StorableType("ADB1DF1C-BE39-49F7-BADD-978F495EEA4D")]
29  internal sealed class SymbolicExpressionTreeGrammar : SymbolicExpressionGrammarBase, ISymbolicExpressionTreeGrammar {
30    [StorableConstructor]
31    private SymbolicExpressionTreeGrammar(StorableConstructorFlag _) : base(_) { }
32    private SymbolicExpressionTreeGrammar(SymbolicExpressionTreeGrammar original, Cloner cloner)
33      : base(original, cloner) {
34      this.grammar = original.grammar;
35    }
36    public override IDeepCloneable Clone(Cloner cloner) {
37      foreach (ISymbol symbol in base.Symbols)
38        if (!cloner.ClonedObjectRegistered(symbol))
39          cloner.RegisterClonedObject(symbol, symbol);
40      return new SymbolicExpressionTreeGrammar(this, cloner);
41    }
42
43    [Storable]
44    private ISymbolicExpressionGrammar grammar;
45    public SymbolicExpressionTreeGrammar(ISymbolicExpressionGrammar grammar)
46      : base("SymbolicExpressionTreeGrammar", "A grammar that is used held by symbolic expression trees and allows extensions to the wrapped grammar.") {
47      if (grammar == null) throw new ArgumentNullException();
48      this.grammar = grammar;
49    }
50
51    public override IEnumerable<ISymbol> Symbols {
52      get {
53        foreach (var s in grammar.Symbols) yield return s;
54        foreach (var s in base.symbols.Values) yield return s;
55      }
56    }
57    public IEnumerable<ISymbol> ModifyableSymbols {
58      get { return base.symbols.Values; }
59    }
60    public bool IsModifyableSymbol(ISymbol symbol) {
61      return base.symbols.ContainsKey(symbol.Name);
62    }
63
64    public override bool ContainsSymbol(ISymbol symbol) {
65      return grammar.ContainsSymbol(symbol) || base.ContainsSymbol(symbol);
66    }
67    public override ISymbol GetSymbol(string symbolName) {
68      var symbol = grammar.GetSymbol(symbolName);
69      if (symbol != null) return symbol;
70      symbol = base.GetSymbol(symbolName);
71      if (symbol != null) return symbol;
72      throw new ArgumentException();
73    }
74
75    public override void RemoveSymbol(ISymbol symbol) {
76      if (!IsModifyableSymbol(symbol)) throw new InvalidOperationException();
77      base.RemoveSymbol(symbol);
78    }
79
80    public override int GetMinimumSubtreeCount(ISymbol symbol) {
81      if (grammar.ContainsSymbol(symbol)) return grammar.GetMinimumSubtreeCount(symbol);
82      return base.GetMinimumSubtreeCount(symbol);
83    }
84    public override int GetMaximumSubtreeCount(ISymbol symbol) {
85      if (grammar.ContainsSymbol(symbol)) return grammar.GetMaximumSubtreeCount(symbol);
86      return base.GetMaximumSubtreeCount(symbol);
87    }
88    public override void SetSubtreeCount(ISymbol symbol, int minimumSubtreeCount, int maximumSubtreeCount) {
89      if (!IsModifyableSymbol(symbol)) throw new InvalidOperationException();
90      base.SetSubtreeCount(symbol, minimumSubtreeCount, maximumSubtreeCount);
91    }
92
93    public override bool IsAllowedChildSymbol(ISymbol parent, ISymbol child) {
94      return grammar.IsAllowedChildSymbol(parent, child) || base.IsAllowedChildSymbol(parent, child);
95    }
96    public override bool IsAllowedChildSymbol(ISymbol parent, ISymbol child, int argumentIndex) {
97      return grammar.IsAllowedChildSymbol(parent, child, argumentIndex) || base.IsAllowedChildSymbol(parent, child, argumentIndex);
98    }
99  }
100}
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