/// <inheritdoc />
public override void Process(TagHelperContext context, TagHelperOutput output)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
if (output == null)
{
throw new ArgumentNullException(nameof(output));
}
// Pass through attribute that is also a well-known HTML attribute.
if (Href != null)
{
output.CopyHtmlAttribute(HrefAttributeName, context);
}
// If there's no "href" attribute in output.Attributes this will noop.
ProcessUrlAttribute(HrefAttributeName, output);
// Retrieve the TagHelperOutput variation of the "href" attribute in case other TagHelpers in the
// pipeline have touched the value. If the value is already encoded this LinkTagHelper may
// not function properly.
Href = output.Attributes[HrefAttributeName]?.Value as string;
Mode mode;
if (!AttributeMatcher.TryDetermineMode(context, ModeDetails, Compare, out mode))
{
// No attributes matched so we have nothing to do
return;
}
// NOTE: Values in TagHelperOutput.Attributes may already be HTML-encoded.
var attributes = new TagHelperAttributeList(output.Attributes);
if (AppendVersion == true)
{
EnsureFileVersionProvider();
if (Href != null)
{
output.Attributes[HrefAttributeName].Value = _fileVersionProvider.AddFileVersionToPath(Href);
}
}
var builder = new DefaultTagHelperContent();
if (mode == Mode.GlobbedHref || mode == Mode.Fallback && !string.IsNullOrEmpty(HrefInclude))
{
BuildGlobbedLinkTags(attributes, builder);
if (string.IsNullOrEmpty(Href))
{
// Only HrefInclude is specified. Don't render the original tag.
output.TagName = null;
output.Content.SetContent(HtmlString.Empty);
}
}
if (mode == Mode.Fallback)
{
string resolvedUrl;
if (TryResolveUrl(FallbackHref, resolvedUrl: out resolvedUrl))
{
FallbackHref = resolvedUrl;
}
BuildFallbackBlock(builder);
}
output.PostElement.SetContent(builder);
}
/// <inheritdoc />
public override void Process(TagHelperContext context, TagHelperOutput output)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
if (output == null)
{
throw new ArgumentNullException(nameof(output));
}
// Pass through attribute that is also a well-known HTML attribute.
if (Src != null)
{
output.CopyHtmlAttribute(SrcAttributeName, context);
}
// If there's no "src" attribute in output.Attributes this will noop.
ProcessUrlAttribute(SrcAttributeName, output);
// Retrieve the TagHelperOutput variation of the "src" attribute in case other TagHelpers in the
// pipeline have touched the value. If the value is already encoded this ScriptTagHelper may
// not function properly.
Src = output.Attributes[SrcAttributeName]?.Value as string;
if (!AttributeMatcher.TryDetermineMode(context, ModeDetails, Compare, out var mode))
{
// No attributes matched so we have nothing to do
return;
}
if (AppendVersion == true)
{
EnsureFileVersionProvider();
if (Src != null)
{
var index = output.Attributes.IndexOfName(SrcAttributeName);
var existingAttribute = output.Attributes[index];
output.Attributes[index] = new TagHelperAttribute(
existingAttribute.Name,
FileVersionProvider.AddFileVersionToPath(ViewContext.HttpContext.Request.PathBase, Src),
existingAttribute.ValueStyle);
}
}
var builder = output.PostElement;
builder.Clear();
if (mode == Mode.GlobbedSrc || mode == Mode.Fallback && !string.IsNullOrEmpty(SrcInclude))
{
BuildGlobbedScriptTags(output.Attributes, builder);
if (string.IsNullOrEmpty(Src))
{
// Only SrcInclude is specified. Don't render the original tag.
output.TagName = null;
output.Content.SetContent(string.Empty);
}
}
if (mode == Mode.Fallback)
{
if (TryResolveUrl(FallbackSrc, resolvedUrl: out string resolvedUrl))
{
FallbackSrc = resolvedUrl;
}
BuildFallbackBlock(output.Attributes, builder);
}
}