private BoundExpression BindElementAccess(ElementAccessExpressionSyntax node)
{
Debug.Assert(node != null);
var expr = BindExpression(node.Expression); // , BIND_RVALUEREQUIRED);
var arguments = node.ArgumentList.Arguments
.Select(arg => BindExpression(arg.Expression))
.ToList();
var argumentNames = node.ArgumentList.Arguments
.Select(arg => arg.NameColonOpt)
.Select(namecolon => namecolon != null ? namecolon.Identifier.GetText() : null)
.ToList();
if (expr.GetExpressionType() == null)
{
return(BoundArrayAccess.AsError(node, expr, arguments, null));
}
if (!expr.IsOK || arguments.Any(x => !x.IsOK))
{
// At this point we definitely have reported an error, but we still might be
// able to get more semantic analysis of the indexing operation. We do not
// want to report cascading errors.
// UNDONE: Set the error bit on the result?
return(GetErrorSuppressingAnalyzer().BindElementAccessCore(node, expr, arguments, argumentNames));
}
return(BindElementAccessCore(node, expr, arguments, argumentNames));
}
private BoundExpression BindArrayAccess(ElementAccessExpressionSyntax node, BoundExpression expr, IList <BoundExpression> arguments, IList <string> argumentNames)
{
Debug.Assert(node != null);
Debug.Assert(expr != null);
Debug.Assert(arguments != null);
Debug.Assert(argumentNames != null);
// For an array access, the primary-no-array-creation-expression of the element-access must
// be a value of an array-type. Furthermore, the argument-list of an array access is not
// allowed to contain named arguments.The number of expressions in the argument-list must
// be the same as the rank of the array-type, and each expression must be of type
// int, uint, long, ulong, or must be implicitly convertible to one or more of these types.
if (argumentNames.Any(x => x != null))
{
Error(ErrorCode.ERR_NamedArgumentForArray, node);
}
var arrayType = (ArrayTypeSymbol)expr.GetExpressionType();
// Note that the spec says to determine which of {int, uint, long, ulong} *each*
// index expression is convertible to. That is not what C# 1 through 4
// did; the implementations instead determined which of those four
// types *all* of the index expressions converted to.
int rank = arrayType.Rank;
if (arguments.Count != arrayType.Rank)
{
Error(ErrorCode.ERR_BadIndexCount, node, rank);
return(BoundArrayAccess.AsError(node, expr, arguments, arrayType.ElementType));
}
var convertedArguments = arguments.Select(x => ConvertToArrayIndex(x)).ToList();
return(new BoundArrayAccess(node, expr, convertedArguments, arrayType.ElementType));
}