public override TreePattern Visit(ExceptionPatternNode node, TreePattern state)
{
var fields = ImmutableArray <TreeRecordPatternField> .Empty;
foreach (var field in node.Fields.Nodes)
{
fields = fields.Add(new TreeRecordPatternField(field.NameToken.Text, Visit(field.Pattern)));
}
return(new TreeExceptionPattern(CreateAlias(node), node.NameToken.Text, fields));
}
public override void Visit(ExceptionPatternNode node)
{
foreach (var field in node.Fields.Nodes)
{
var name = field.NameToken;
if (name.IsMissing)
{
continue;
}
var duplicate = false;
foreach (var field2 in node.Fields.Nodes)
{
if (field2 != field && field2.NameToken.Text == name.Text)
{
duplicate = true;
break;
}
}
if (!duplicate)
{
continue;
}
Error(field, SyntaxDiagnosticKind.DuplicatePatternField, name.Location,
$"Exception field '{name}' is matched multiple times");
}
base.Visit(node);
var alias = node.Alias;
if (alias != null && !alias.NameToken.IsMissing)
{
_scope.Define(alias.MutKeywordToken != null ? SyntaxSymbolKind.Mutable :
SyntaxSymbolKind.Immutable, null, alias, alias.NameToken.Text);
}
}
