/// <summary>
/// When a name is absent, deconstruct a given tuple, otherwise create virtual member references
/// </summary>
private Ust HandleTupleStatement(VariableDeclarationSyntax node)
{
List <AssignmentExpression> variables =
node.Variables.Select(v => (AssignmentExpression)VisitAndReturnNullIfError(v)).ToList();
var typeNode = (TupleTypeSyntax)node.Type;
var textSpan = node.GetTextSpan();
for (int i = 0; i < typeNode.Elements.Count; i++)
{
TupleElementSyntax typeElement = typeNode.Elements[i];
if (typeElement.Identifier == null)
{
continue;
}
var initValues = node.Variables.Select(v =>
{
var tuple = v.Initializer?.Value as TupleExpressionSyntax;
if (tuple == null)
{
return(null);
}
return((Expression)base.Visit(tuple.Arguments.ElementAtOrDefault(i)));
}).ToList();
variables = CreateVirtualMemberRefs(variables, typeElement, i, initValues, typeNode.Elements[i].GetTextSpan());
}
var declaration = new VariableDeclarationExpression(null, variables, textSpan);
return(new ExpressionStatement(declaration));
}
public override UstNode VisitVariableDeclaration(VariableDeclarationSyntax node)
{
var typeToken = ConvertType(base.Visit(node.Type));
AssignmentExpression[] vars = node
.Variables.Select(v => (AssignmentExpression)VisitAndReturnNullIfError(v))
.ToArray();
var result = new VariableDeclarationExpression(typeToken, vars, node.GetTextSpan(), FileNode);
return(result);
}