source: branches/2893_BNLR/HeuristicLab.ExtLibs/HeuristicLab.NRefactory/5.5.0/NRefactory.CSharp-5.5.0/Resolver/CSharpInvocationResolveResult.cs

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

namespace ICSharpCode.NRefactory.CSharp.Resolver
{
  /// <summary>
  /// Represents the result of a method, constructor or indexer invocation.
  /// Provides additional C#-specific information for InvocationResolveResult.
  /// </summary>
  public class CSharpInvocationResolveResult : InvocationResolveResult
  {
    public readonly OverloadResolutionErrors OverloadResolutionErrors;
    
    /// <summary>
    /// Gets whether this invocation is calling an extension method using extension method syntax.
    /// </summary>
    public readonly bool IsExtensionMethodInvocation;
    
    /// <summary>
    /// Gets whether this invocation is calling a delegate (without explicitly calling ".Invoke()").
    /// </summary>
    public readonly bool IsDelegateInvocation;
    
    /// <summary>
    /// Gets whether a params-Array is being used in its expanded form.
    /// </summary>
    public readonly bool IsExpandedForm;
    
    readonly IList<int> argumentToParameterMap;

    /// <summary>
    /// If IsExtensionMethodInvocation is true this property holds the reduced method.
    /// </summary>
    IMethod reducedMethod;
    public IMethod ReducedMethod {
      get {
        if (!IsExtensionMethodInvocation)
          return null;
        if (reducedMethod == null && Member is IMethod)
          reducedMethod = new ReducedExtensionMethod ((IMethod)Member);
        return reducedMethod;
      }
    }
    
    public CSharpInvocationResolveResult(
      ResolveResult targetResult, IParameterizedMember member,
      IList<ResolveResult> arguments,
      OverloadResolutionErrors overloadResolutionErrors = OverloadResolutionErrors.None,
      bool isExtensionMethodInvocation = false,
      bool isExpandedForm = false,
      bool isDelegateInvocation = false,
      IList<int> argumentToParameterMap = null,
      IList<ResolveResult> initializerStatements = null,
      IType returnTypeOverride = null
    )
      : base(targetResult, member, arguments, initializerStatements, returnTypeOverride)
    {
      this.OverloadResolutionErrors = overloadResolutionErrors;
      this.IsExtensionMethodInvocation = isExtensionMethodInvocation;
      this.IsExpandedForm = isExpandedForm;
      this.IsDelegateInvocation = isDelegateInvocation;
      this.argumentToParameterMap = argumentToParameterMap;
    }
    
    public override bool IsError {
      get { return this.OverloadResolutionErrors != OverloadResolutionErrors.None; }
    }
    
    /// <summary>
    /// Gets an array that maps argument indices to parameter indices.
    /// For arguments that could not be mapped to any parameter, the value will be -1.
    /// 
    /// parameterIndex = ArgumentToParameterMap[argumentIndex]
    /// </summary>
    public IList<int> GetArgumentToParameterMap()
    {
      return argumentToParameterMap;
    }
    
    public override IList<ResolveResult> GetArgumentsForCall()
    {
      ResolveResult[] results = new ResolveResult[Member.Parameters.Count];
      List<ResolveResult> paramsArguments = IsExpandedForm ? new List<ResolveResult>() : null;
      // map arguments to parameters:
      for (int i = 0; i < Arguments.Count; i++) {
        int mappedTo;
        if (argumentToParameterMap != null)
          mappedTo = argumentToParameterMap[i];
        else
          mappedTo = IsExpandedForm ? Math.Min(i, results.Length - 1) : i;
        
        if (mappedTo >= 0 && mappedTo < results.Length) {
          if (IsExpandedForm && mappedTo == results.Length - 1) {
            paramsArguments.Add(Arguments[i]);
          } else {
            var narr = Arguments[i] as NamedArgumentResolveResult;
            if (narr != null)
              results[mappedTo] = narr.Argument;
            else
              results[mappedTo] = Arguments[i];
          }
        }
      }
      if (IsExpandedForm){
        IType arrayType = Member.Parameters.Last().Type;
        IType int32 = Member.Compilation.FindType(KnownTypeCode.Int32);
        ResolveResult[] sizeArguments = { new ConstantResolveResult(int32, paramsArguments.Count) };
        results[results.Length - 1] = new ArrayCreateResolveResult(arrayType, sizeArguments, paramsArguments);
      }
      
      for (int i = 0; i < results.Length; i++) {
        if (results[i] == null) {
          if (Member.Parameters[i].IsOptional) {
            results[i] = new ConstantResolveResult(Member.Parameters[i].Type, Member.Parameters[i].ConstantValue);
          } else {
            results[i] = ErrorResolveResult.UnknownError;
          }
        }
      }
      
      return results;
    }
  }
}