public override SyntaxNode VisitGenericBlock(GenericBlockSyntax node)
{
if (_tryParseResult.IsBoundNonStringAttribute && CanBeCollapsed(node))
{
var tokens = node.GetTokens();
var expression = SyntaxFactory.CSharpExpressionLiteral(tokens);
var rewrittenExpression = (CSharpExpressionLiteralSyntax)VisitCSharpExpressionLiteral(expression);
var newChildren = SyntaxListBuilder <RazorSyntaxNode> .Create();
newChildren.Add(rewrittenExpression);
return(node.Update(newChildren));
}
return(base.VisitGenericBlock(node));
}
// Being collapsed represents that a block contains several identical looking markup literal attribute values. This can be the case
// when a user has written something like: @onclick="() => SomeMethod()"
// In that case there would be 3 children:
// - ()
// - =>
// - SomeMethod()
// There are 3 children because the Razor parser separates attribute values based on whitespace.
private static bool CanBeCollapsed(GenericBlockSyntax node)
{
if (node.Children.Count <= 1)
{
// The node is either already collapsed or has no children.
return(false);
}
for (var i = 0; i < node.Children.Count; i++)
{
if (node.Children[i].Kind != SyntaxKind.MarkupLiteralAttributeValue)
{
return(false);
}
}
return(true);
}
