private TupleBinaryOperatorInfo.Multiple BindTupleBinaryOperatorNestedInfo(BinaryExpressionSyntax node, BinaryOperatorKind kind,
BoundExpression left, BoundExpression right, BindingDiagnosticBag diagnostics)
{
left = GiveTupleTypeToDefaultLiteralIfNeeded(left, right.Type);
right = GiveTupleTypeToDefaultLiteralIfNeeded(right, left.Type);
if (left.IsLiteralDefaultOrImplicitObjectCreation() ||
right.IsLiteralDefaultOrImplicitObjectCreation())
{
ReportBinaryOperatorError(node, diagnostics, node.OperatorToken, left, right, LookupResultKind.Ambiguous);
return(TupleBinaryOperatorInfo.Multiple.ErrorInstance);
}
// Aside from default (which we fixed or ruled out above) and tuple literals,
// we must have typed expressions at this point
Debug.Assert((object)left.Type != null || left.Kind == BoundKind.TupleLiteral);
Debug.Assert((object)right.Type != null || right.Kind == BoundKind.TupleLiteral);
int leftCardinality = GetTupleCardinality(left);
int rightCardinality = GetTupleCardinality(right);
if (leftCardinality != rightCardinality)
{
Error(diagnostics, ErrorCode.ERR_TupleSizesMismatchForBinOps, node, leftCardinality, rightCardinality);
return(TupleBinaryOperatorInfo.Multiple.ErrorInstance);
}
(ImmutableArray <BoundExpression> leftParts, ImmutableArray <string> leftNames) = GetTupleArgumentsOrPlaceholders(left);
(ImmutableArray <BoundExpression> rightParts, ImmutableArray <string> rightNames) = GetTupleArgumentsOrPlaceholders(right);
ReportNamesMismatchesIfAny(left, right, leftNames, rightNames, diagnostics);
int length = leftParts.Length;
Debug.Assert(length == rightParts.Length);
var operatorsBuilder = ArrayBuilder <TupleBinaryOperatorInfo> .GetInstance(length);
for (int i = 0; i < length; i++)
{
operatorsBuilder.Add(BindTupleBinaryOperatorInfo(node, kind, leftParts[i], rightParts[i], diagnostics));
}
var compilation = this.Compilation;
var operators = operatorsBuilder.ToImmutableAndFree();
// typeless tuple literals are not nullable
bool leftNullable = left.Type?.IsNullableType() == true;
bool rightNullable = right.Type?.IsNullableType() == true;
bool isNullable = leftNullable || rightNullable;
TypeSymbol leftTupleType = MakeConvertedType(operators.SelectAsArray(o => o.LeftConvertedTypeOpt), node.Left, leftParts, leftNames, isNullable, compilation, diagnostics);
TypeSymbol rightTupleType = MakeConvertedType(operators.SelectAsArray(o => o.RightConvertedTypeOpt), node.Right, rightParts, rightNames, isNullable, compilation, diagnostics);
return(new TupleBinaryOperatorInfo.Multiple(operators, leftTupleType, rightTupleType));
}
private static bool IsTupleBinaryOperation(BoundExpression left, BoundExpression right)
{
bool leftDefaultOrNew = left.IsLiteralDefaultOrImplicitObjectCreation();
bool rightDefaultOrNew = right.IsLiteralDefaultOrImplicitObjectCreation();
if (leftDefaultOrNew && rightDefaultOrNew)
{
return(false);
}
return((GetTupleCardinality(left) > 1 || leftDefaultOrNew) &&
(GetTupleCardinality(right) > 1 || rightDefaultOrNew));
}