source: branches/Async/HeuristicLab.ExtLibs/HeuristicLab.NRefactory/5.5.0/NRefactory-5.5.0/Semantics/MemberResolveResult.cs @ 13780

// Copyright (c) 2010-2013 AlphaSierraPapa for the SharpDevelop Team
// 
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// 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.
// 
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// 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
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using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;

using ICSharpCode.NRefactory.TypeSystem;

namespace ICSharpCode.NRefactory.Semantics
{
  /// <summary>
  /// Represents the result of a member invocation.
  /// Used for field/property/event access.
  /// Also, <see cref="InvocationResolveResult"/> derives from MemberResolveResult.
  /// </summary>
  public class MemberResolveResult : ResolveResult
  {
    readonly IMember member;
    readonly bool isConstant;
    readonly object constantValue;
    readonly ResolveResult targetResult;
    readonly bool isVirtualCall;
    
    public MemberResolveResult(ResolveResult targetResult, IMember member, IType returnTypeOverride = null)
      : base(returnTypeOverride ?? ComputeType(member))
    {
      this.targetResult = targetResult;
      this.member = member;
      var thisRR = targetResult as ThisResolveResult;
      this.isVirtualCall = member.IsOverridable && !(thisRR != null && thisRR.CausesNonVirtualInvocation);
      
      IField field = member as IField;
      if (field != null) {
        isConstant = field.IsConst;
        if (isConstant)
          constantValue = field.ConstantValue;
      }
    }
    
    public MemberResolveResult(ResolveResult targetResult, IMember member, bool isVirtualCall, IType returnTypeOverride = null)
      : base(returnTypeOverride ?? ComputeType(member))
    {
      this.targetResult = targetResult;
      this.member = member;
      this.isVirtualCall = isVirtualCall;
      IField field = member as IField;
      if (field != null) {
        isConstant = field.IsConst;
        if (isConstant)
          constantValue = field.ConstantValue;
      }
    }
    
    static IType ComputeType(IMember member)
    {
      switch (member.SymbolKind) {
        case SymbolKind.Constructor:
          return member.DeclaringType;
        case SymbolKind.Field:
          if (((IField)member).IsFixed)
            return new PointerType(member.ReturnType);
          break;
      }
      return member.ReturnType;
    }
    
    public MemberResolveResult(ResolveResult targetResult, IMember member, IType returnType, bool isConstant, object constantValue)
      : base(returnType)
    {
      this.targetResult = targetResult;
      this.member = member;
      this.isConstant = isConstant;
      this.constantValue = constantValue;
    }
    
    public MemberResolveResult(ResolveResult targetResult, IMember member, IType returnType, bool isConstant, object constantValue, bool isVirtualCall)
      : base(returnType)
    {
      this.targetResult = targetResult;
      this.member = member;
      this.isConstant = isConstant;
      this.constantValue = constantValue;
      this.isVirtualCall = isVirtualCall;
    }
    
    public ResolveResult TargetResult {
      get { return targetResult; }
    }
    
    /// <summary>
    /// Gets the member.
    /// This property never returns null.
    /// </summary>
    public IMember Member {
      get { return member; }
    }
    
    /// <summary>
    /// Gets whether this MemberResolveResult is a virtual call.
    /// </summary>
    public bool IsVirtualCall {
      get { return isVirtualCall; }
    }
    
    public override bool IsCompileTimeConstant {
      get { return isConstant; }
    }
    
    public override object ConstantValue {
      get { return constantValue; }
    }
    
    public override IEnumerable<ResolveResult> GetChildResults()
    {
      if (targetResult != null)
        return new[] { targetResult };
      else
        return Enumerable.Empty<ResolveResult>();
    }
    
    public override string ToString()
    {
      return string.Format(CultureInfo.InvariantCulture, "[{0} {1}]", GetType().Name, member);
    }
    
    public override DomRegion GetDefinitionRegion()
    {
      return member.Region;
    }
  }
}