/// <summary>
/// Returns true if the expression is composed only of nested tuple, declaration expressions and discards.
/// </summary>
internal static bool IsDeconstructionDeclarationLeft(this Syntax.InternalSyntax.ExpressionSyntax node)
{
switch (node.Kind)
{
case SyntaxKind.TupleExpression:
var arguments = ((Syntax.InternalSyntax.TupleExpressionSyntax)node).Arguments;
for (int i = 0; i < arguments.Count; i++)
{
if (!IsDeconstructionDeclarationLeft(arguments[i].Expression))
{
return(false);
}
}
return(true);
case SyntaxKind.DeclarationExpression:
return(true);
case SyntaxKind.IdentifierName:
// Underscore is the only expression that is not clearly a declaration that we tolerate for now
return(node.RawContextualKind == (int)SyntaxKind.UnderscoreToken);
default:
return(false);
}
}
/// <summary>
/// Returns true if the expression is composed only of nested tuple and declaration expressions.
/// </summary>
internal static bool IsDeconstructionDeclarationLeft(this Syntax.InternalSyntax.ExpressionSyntax node)
{
switch (node.Kind)
{
case SyntaxKind.TupleExpression:
var arguments = ((Syntax.InternalSyntax.TupleExpressionSyntax)node).Arguments;
for (int i = 0; i < arguments.Count; i++)
{
if (!IsDeconstructionDeclarationLeft(arguments[i].Expression))
{
return(false);
}
}
return(true);
case SyntaxKind.DeclarationExpression:
return(true);
default:
return(false);
}
}
