internal HtmlElementDefinition GetTag(string tagName)
{
if (tagName == null)
{
throw new ArgumentNullException(nameof(tagName));
}
tagName = tagName.Trim().ToLowerInvariant();
if (tagName.Length == 0)
{
throw Failure.AllWhitespace(nameof(tagName));
}
// TODO This behavior causes any undefined tag to be
// added to HTML 5 (need different behavior)
var tags = this.ElementDefinitions;
lock (tags) {
var tag = (HtmlElementDefinition)tags[tagName];
if (tag == null)
{
// not defined: create default; go anywhere, do anything! (incl be inside a <p>)
tag = new HtmlElementDefinition(tagName);
tags.Add(tag);
tag.IsUnknownTag = true;
tag.IsBlock = false;
tag.CanContainBlock = true;
}
return(tag);
}
}
public static void CopyTo(DomElementDefinitionCollection tags)
{
foreach (string tagName in blockTags)
{
HtmlElementDefinition tag = new HtmlElementDefinition(tagName);
tags.Add(tag);
}
foreach (string tagName in inlineTags)
{
HtmlElementDefinition tag = new HtmlElementDefinition(tagName);
tag.IsBlock = false;
tag.CanContainBlock = false;
tag.FormatAsBlock = false;
tags.Add(tag);
}
// mods:
foreach (string tagName in emptyTags)
{
HtmlElementDefinition tag = (HtmlElementDefinition)tags[tagName];
tag.CanContainBlock = false;
tag.CanContainInline = false;
// can self close (<foo />). used for unknown tags that self close, without forcing them as empty.
tag.IsEmpty = true; // can hold nothing; e.g. img
tag.IsSelfClosing = true;
}
foreach (string tagName in formatAsInlineTags)
{
HtmlElementDefinition tag = (HtmlElementDefinition)tags[tagName];
tag.FormatAsBlock = false;
}
// for pre, textarea, script etc
foreach (string tagName in preserveWhitespaceTags)
{
HtmlElementDefinition tag = (HtmlElementDefinition)tags[tagName];
tag.WhitespaceMode = DomWhitespaceMode.Preserve;
}
}