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public void Completion(int i,int j) { }

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 Completion(

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int i, int j

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 public List GetCompletionData(String code,int offset,CompletionType completionType)
{
var syntaxTree = SyntaxFactory.ParseSyntaxTree(code);
var compilation = CSharpCompilation.Create("foo")
.AddReferences(Mscorlib)
.AddSyntaxTrees(syntaxTree);
var semanticModel = compilation.GetSemanticModel(syntaxTree);
var textSpan = GetTextSpan(offset,1);// '.' or '(' coordinates
ITypeSymbol lhsType = null;
if (completionType == CompletionType.DotCompletion)
{
var memberAccessNode = (MemberAccessExpressionSyntax)syntaxTree.GetRoot()
.DescendantNodes(textSpan).Last();
lhsType = semanticModel.GetTypeInfo(memberAccessNode.Expression).Type;
}
else if(completionType==CompletionType.ArgumentListCompletion)
{
var arr = syntaxTree.GetRoot().DescendantNodes(textSpan).Last();
var argumentListMode = (ArgumentListSyntax)syntaxTree.GetRoot().DescendantNodes(textSpan).Last();
var directive = argumentListMode.GetFirstDirective();
var arrgs=argumentListMode.Arguments;
//lhsType = semanticModel.GetTypeInfo(directive).Type;
//how to get lhsType?
}

if (lhsType == null)
return new List();
List completionDataColl = new List();

// and here I make completion data
foreach (var symbol in lhsType.GetMembers())
{
if (!symbol.CanBeReferencedByName
|| symbol.DeclaredAccessibility != Accessibility.Public
|| symbol.IsStatic)
continue;
}
}