private static string GetTagNameCore(RazorBlockSyntax tagBlock)
{
if (tagBlock == null)
{
throw new ArgumentNullException(nameof(tagBlock));
}
MarkupTextLiteralSyntax nameLiteral = null;
var isBangTag = false;
if (tagBlock.Children.Count > 0 && tagBlock.Children[0] is MarkupTextLiteralSyntax firstChild)
{
if (firstChild.GetContent().StartsWith("<") &&
tagBlock.Children.Count >= 3 &&
tagBlock.Children[1] is RazorMetaCodeSyntax &&
tagBlock.Children[2] is MarkupTextLiteralSyntax potentialBangTagName)
{
isBangTag = true;
nameLiteral = potentialBangTagName;
}
else
{
nameLiteral = firstChild;
}
}
if (nameLiteral == null)
{
return(null);
}
SyntaxToken textToken = null;
for (var i = 0; i < nameLiteral.LiteralTokens.Count; i++)
{
var token = nameLiteral.LiteralTokens[i];
if (token != null &&
(token.Kind == SyntaxKind.Whitespace || token.Kind == SyntaxKind.Text))
{
textToken = token;
break;
}
}
if (textToken == null)
{
return(null);
}
var name = textToken.Kind == SyntaxKind.Whitespace ? null : textToken.Content;
if (name != null && isBangTag)
{
name = "!" + name;
}
return(name);
}
private static bool IsSelfClosingCore(RazorBlockSyntax tagBlock)
{
if (tagBlock == null)
{
throw new ArgumentNullException(nameof(tagBlock));
}
var lastChild = tagBlock.ChildNodes().LastOrDefault();
return(lastChild?.GetContent().EndsWith("/>", StringComparison.Ordinal) ?? false);
}
private static MarkupTagHelperAttributeValueSyntax RewriteAttributeValue(TryParseResult result, RazorBlockSyntax attributeValue)
{
var rewriter = new AttributeValueRewriter(result);
var rewrittenValue = attributeValue;
if (result.IsBoundAttribute)
{
// If the attribute was requested by a tag helper but the corresponding property was not a
// string, then treat its value as code. A non-string value can be any C# value so we need
// to ensure the tree reflects that.
rewrittenValue = (RazorBlockSyntax)rewriter.Visit(attributeValue);
}
return(SyntaxFactory.MarkupTagHelperAttributeValue(rewrittenValue.Children));
}