/// <summary>
/// Creates an LinkRel provider for the provided element.
/// </summary>
/// <param name="link">The link element.</param>
/// <param name="rel">The current value of the rel attribute.</param>
/// <returns>The LinkRel provider instance or null.</returns>
public BaseLinkRelation?Create(IHtmlLinkElement link, String?rel)
{
if (rel != null && _creators.TryGetValue(rel, out var creator))
{
return(creator.Invoke(link));
}
return(CreateDefault(link, rel));
}
static bool SameLink(IHtmlLinkElement m, LinkElement a)
{
return(m.Relation == a.Rel && (
(new[] { "canonical", "prev", "next" }.Contains(a.Rel)) ||
(a.Rel == "icon" && (m.Sizes?.ToString() ?? "") == a.Sizes) ||
(a.Rel == "alternate" && m.Type == a.Type && m.Media == a.Media) ||
(Href(m.Href) == a.Href)
));
};
static bool SameLink(IHtmlLinkElement m, LinkElement a)
{
return(m.Relation == a.Rel && (a.Rel switch
{
"canonical" => true,
"prev" => true,
"next" => true,
"icon" => (m.Sizes?.ToString() ?? "") == (a.Sizes ?? ""),
"alternate" => (m.Type ?? "") == (a.Type ?? "") && (m.Media ?? "") == (a.Media ?? ""),
"preload" => Href(m.Href) == (a.Href ?? "") && (m.Media ?? "") == (a.Media ?? ""),
_ => Href(m.Href) == (a.Href ?? "")
}));
/// <summary>
/// Creates the default LinkRel provider for the given link element
/// and relation. By default this is null.
/// </summary>
/// <param name="link">The link element.</param>
/// <param name="rel">The current value of the rel attribute.</param>
/// <returns>The LinkRel provider instance or null.</returns>
protected virtual BaseLinkRelation?CreateDefault(IHtmlLinkElement link, String?rel)
{
return(default(BaseLinkRelation));
}
/// <summary>
/// Creates a new instance of the relation processor.
/// </summary>
public BaseLinkRelation(IHtmlLinkElement link, IRequestProcessor processor)
{
_link = link;
_processor = processor;
}
public ImportLinkRelation(IHtmlLinkElement link)
: base(link, new DocumentRequestProcessor(link?.Owner.Context))
{
}
public StyleSheetLinkRelation(IHtmlLinkElement link)
: base(link, new StyleSheetRequestProcessor(link?.Owner.Context, link))
{
}
