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Viewing changes to contrib/ICSharpCode.NRefactory/TypeSystem/InheritanceHelper.cs

  • Committer: Package Import Robot
  • Author(s): Jo Shields
  • Date: 2013-05-12 09:46:03 UTC
  • mto: This revision was merged to the branch mainline in revision 29.
  • Revision ID: package-import@ubuntu.com-20130512094603-mad323bzcxvmcam0
Tags: upstream-4.0.5+dfsg
Import upstream version 4.0.5+dfsg

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contrib/ICSharpCode.NRefactory/TypeSystem/InheritanceHelper.cs
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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team
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// 
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// Permission is hereby granted, free of charge, to any person obtaining a copy of this
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// software and associated documentation files (the "Software"), to deal in the Software
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// without restriction, including without limitation the rights to use, copy, modify, merge,
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// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
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// to whom the Software is furnished to do so, subject to the following conditions:
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// 
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// The above copyright notice and this permission notice shall be included in all copies or
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// substantial portions of the Software.
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// 
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
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// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using ICSharpCode.NRefactory.TypeSystem.Implementation;
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namespace ICSharpCode.NRefactory.TypeSystem
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{
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        /// <summary>
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        /// Provides helper methods for inheritance.
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        /// </summary>
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        public static class InheritanceHelper
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        {
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                // TODO: maybe these should be extension methods?
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                // or even part of the interface itself? (would allow for easy caching)
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                #region GetBaseMember
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                /// <summary>
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                /// Gets the base member that has the same signature.
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                /// </summary>
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                public static IMember GetBaseMember(IMember member)
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                {
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                        return GetBaseMembers(member, false).FirstOrDefault();
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                }
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                /// <summary>
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                /// Gets all base members that have the same signature.
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                /// </summary>
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                /// <returns>
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                /// List of base members with the same signature. The member from the derived-most base class is returned first.
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                /// </returns>
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                public static IEnumerable<IMember> GetBaseMembers(IMember member, bool includeImplementedInterfaces)
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                {
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                        if (member == null)
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                                throw new ArgumentNullException("member");
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                        if (member.IsExplicitInterfaceImplementation && member.ImplementedInterfaceMembers.Count == 1) {
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                                // C#-style explicit interface implementation
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                                member = member.ImplementedInterfaceMembers[0];
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                                yield return member;
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                        }
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                        SpecializedMember specializedMember = member as SpecializedMember;
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                        member = member.MemberDefinition;
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                        IEnumerable<IType> allBaseTypes;
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                        if (includeImplementedInterfaces) {
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                                allBaseTypes = member.DeclaringTypeDefinition.GetAllBaseTypes();
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                        } else {
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                                allBaseTypes = member.DeclaringTypeDefinition.GetNonInterfaceBaseTypes();
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                        }
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                        foreach (IType baseType in allBaseTypes.Reverse()) {
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                                if (baseType == member.DeclaringTypeDefinition)
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                                        continue;
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                                foreach (IMember baseMember in baseType.GetMembers(m => m.Name == member.Name, GetMemberOptions.IgnoreInheritedMembers)) {
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                                        if (SignatureComparer.Ordinal.Equals(member, baseMember)) {
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                                                if (specializedMember != null)
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                                                        yield return SpecializedMember.Create(baseMember, specializedMember.Substitution);
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                                                else
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                                                        yield return baseMember;
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                                        }
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                                }
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                        }
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                }
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                #endregion
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                #region GetDerivedMember
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                /// <summary>
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                /// Finds the member declared in 'derivedType' that has the same signature (could override) 'baseMember'.
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                /// </summary>
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                public static IMember GetDerivedMember(IMember baseMember, ITypeDefinition derivedType)
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                {
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                        if (baseMember == null)
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                                throw new ArgumentNullException("baseMember");
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                        if (derivedType == null)
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                                throw new ArgumentNullException("derivedType");
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                        baseMember = baseMember.MemberDefinition;
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                        bool includeInterfaces = baseMember.DeclaringTypeDefinition.Kind == TypeKind.Interface;
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                        IMethod method = baseMember as IMethod;
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                        if (method != null) {
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                                foreach (IMethod derivedMethod in derivedType.Methods) {
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                                        if (derivedMethod.Name == method.Name && derivedMethod.Parameters.Count == method.Parameters.Count) {
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                                                if (derivedMethod.TypeParameters.Count == method.TypeParameters.Count) {
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                                                        // The method could override the base method:
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                                                        if (GetBaseMembers(derivedMethod, includeInterfaces).Any(m => m.MemberDefinition == baseMember))
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                                                                return derivedMethod;
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                                                }
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                                        }
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                                }
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                        }
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                        IProperty property = baseMember as IProperty;
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                        if (property != null) {
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                                foreach (IProperty derivedProperty in derivedType.Properties) {
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                                        if (derivedProperty.Name == property.Name && derivedProperty.Parameters.Count == property.Parameters.Count) {
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                                                // The property could override the base property:
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                                                if (GetBaseMembers(derivedProperty, includeInterfaces).Any(m => m.MemberDefinition == baseMember))
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                                                        return derivedProperty;
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                                        }
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                                }
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                        }
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                        if (baseMember is IEvent) {
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                                foreach (IEvent derivedEvent in derivedType.Events) {
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                                        if (derivedEvent.Name == baseMember.Name)
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                                                return derivedEvent;
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                                }
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                        }
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                        if (baseMember is IField) {
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                                foreach (IField derivedField in derivedType.Fields) {
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                                        if (derivedField.Name == baseMember.Name)
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                                                return derivedField;
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                                }
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                        }
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                        return null;
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                }
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                #endregion
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        }
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}