source: branches/2994-AutoDiffForIntervals/HeuristicLab.ExtLibs/HeuristicLab.NRefactory/5.5.0/NRefactory-5.5.0/Analysis/SymbolCollector.cs

// Copyright (c) 2013 AlphaSierraPapa for the SharpDevelop Team
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// DEALINGS IN THE SOFTWARE.

using System;
using System.Collections.Generic;
using ICSharpCode.NRefactory.TypeSystem;
using System.Linq;

namespace ICSharpCode.NRefactory.Analysis
{
  /// <summary>
  /// The symbol collector collects related symbols that form a group of symbols that should be renamed
  /// when a name of one symbol changes. For example if a type definition name should be changed
  /// the constructors and destructor names should change as well.
  /// </summary>
  public class SymbolCollector
  {
    /// <summary>
    /// Gets or sets a value indicating whether this <see cref="ICSharpCode.NRefactory.Analysis.SymbolCollector"/> should include overloads.
    /// </summary>
    /// <value><c>true</c> if overloads should be included; otherwise, <c>false</c>.</value>
    public bool IncludeOverloads { 
      get;
      set;
    }

    public bool GroupForRenaming {
      get;
      set;
    }

    static IEnumerable<ISymbol> CollectTypeRelatedMembers (ITypeDefinition type)
    {
      yield return type;
      foreach (var c in type.GetDefinition ().GetMembers (m => !m.IsSynthetic && (m.SymbolKind == SymbolKind.Constructor || m.SymbolKind == SymbolKind.Destructor), GetMemberOptions.IgnoreInheritedMembers)) {
        yield return c;
      }
    }

    static IEnumerable<ISymbol> CollectOverloads (IMethod method)
    {
      return method.DeclaringType
        .GetMethods (m => m.Name == method.Name)
        .Where (m => m != method);
    }

    static IMember SearchMember (ITypeDefinition derivedType, IMember method)
    {
      foreach (var m in derivedType.Members) {
        if (m.ImplementedInterfaceMembers.Contains (method))
          return m;
      }
      return null;
    }

    static IEnumerable<ISymbol> MakeUnique (List<ISymbol> symbols)
    {
      HashSet<ISymbol> taken = new HashSet<ISymbol> ();
      foreach (var sym in symbols) {
        if (taken.Contains (sym))
          continue;
        taken.Add (sym);
        yield return sym;
      }
    }

    /// <summary>
    /// Gets the related symbols.
    /// </summary>
    /// <returns>The related symbols.</returns>
    /// <param name="g">The type graph.</param>
    /// <param name="m">The symbol to search</param>
    public IEnumerable<ISymbol> GetRelatedSymbols(Lazy<TypeGraph> g, ISymbol m)
    {
      switch (m.SymbolKind) {
      case SymbolKind.TypeDefinition:
        return CollectTypeRelatedMembers ((ITypeDefinition)m);
  
      case SymbolKind.Field:
      case SymbolKind.Operator:
      case SymbolKind.Variable:
      case SymbolKind.Parameter:
      case SymbolKind.TypeParameter:
        return new ISymbol[] { m };
  
      case SymbolKind.Constructor:
        if (GroupForRenaming)
          return GetRelatedSymbols (g, ((IMethod)m).DeclaringTypeDefinition);
        List<ISymbol> constructorSymbols = new List<ISymbol> ();
        if (IncludeOverloads) {
          foreach (var m3 in CollectOverloads ((IMethod)m)) {
            constructorSymbols.Add (m3);
          }
        }
        return constructorSymbols;

      case SymbolKind.Destructor:
        if (GroupForRenaming)
          return GetRelatedSymbols (g, ((IMethod)m).DeclaringTypeDefinition);
        return new ISymbol[] { m };

      case SymbolKind.Indexer:
      case SymbolKind.Event:
      case SymbolKind.Property:
      case SymbolKind.Method: {
        var member = (IMember)m;
        List<ISymbol> symbols = new List<ISymbol> ();
        if (!member.IsExplicitInterfaceImplementation)
          symbols.Add (member);
        if (GroupForRenaming) {
          foreach (var m2 in member.ImplementedInterfaceMembers) {
            symbols.AddRange (GetRelatedSymbols (g, m2));
          }
        } else {
          symbols.AddRange(member.ImplementedInterfaceMembers);
        }

        if (member.DeclaringType.Kind == TypeKind.Interface) {
          var declaringTypeNode = g.Value.GetNode(member.DeclaringTypeDefinition);
          if (declaringTypeNode != null) {
            foreach (var derivedType in declaringTypeNode.DerivedTypes) {
              var mem = SearchMember (derivedType.TypeDefinition, member);
              if (mem != null)
                symbols.Add (mem);
            }
          }
        }


        if (IncludeOverloads) {
          IncludeOverloads = false;
          if (member is IMethod) {
            foreach (var m3 in CollectOverloads ((IMethod)member)) {
              symbols.AddRange (GetRelatedSymbols (g, m3));
            }
          } else if (member.SymbolKind == SymbolKind.Indexer) {
            symbols.AddRange (member.DeclaringTypeDefinition.GetProperties (p => p.IsIndexer));
          }
        }
        return MakeUnique (symbols);
      }
      case SymbolKind.Namespace:
        // TODO?
        return new ISymbol[] { m };
      default:
        throw new ArgumentOutOfRangeException ("symbol:"+m.SymbolKind);
      }
    }
  }
}