/// <summary> Renders the resource element described by resource. </summary>
/// <exception cref="InvalidOperationException"> Thrown if the resource type is invalid. </exception>
/// <param name="resource"> The resource to render. </param>
/// <returns> The rendered resource as a string. </returns>
public virtual string RenderResourceElement(ResourceInfo resource)
{
var text = string.Empty;
var fallbackTestExpr = resource.FallbackTestExpression;
string fallbackElement = null;
switch (resource.Type)
{
case ResourceTypes.CSS:
text = _RenderCSS(resource.GetURI(_UrlHelper));
if (!string.IsNullOrWhiteSpace(resource.FallbackPath))
{
if (!string.IsNullOrWhiteSpace(resource.FallbackTestClass))
{
text += Environment.NewLine + "<meta name=\"x-stylesheet-fallback-test\" class=\"" + resource.FallbackTestClass + "\" />";
}
if (fallbackTestExpr == null)
{
fallbackTestExpr = @"(function (a, b, c) { var e = _d.getElementsByTagName('meta'), meta = e[e.length-1]; return _d.defaultView.getComputedStyle(meta)[a] === b;})('" + resource.FallbackTestProperty + @"', '" + resource.FallbackTestPropertyValue + @"', '" + resource.FallbackPath + @"')";
}
fallbackElement = _RenderCSS(resource.GetFallbackURI(_UrlHelper));
}
break;
case ResourceTypes.Script: // (or Scripts.Render() can be used)
text = _RenderScript(resource.GetURI(_UrlHelper));
if (!string.IsNullOrWhiteSpace(resource.FallbackPath))
{
fallbackElement = _RenderScript(resource.GetFallbackURI(_UrlHelper));
}
break;
default:
throw new InvalidOperationException("ResourceInfo: Invalid resource type value for URI '" + resource.Path + "'.");
}
if (!string.IsNullOrWhiteSpace(text))
{
text += Environment.NewLine;
if (!string.IsNullOrEmpty(fallbackTestExpr) && !string.IsNullOrEmpty(fallbackElement))
{
text += @"
<script>
(function () {
var _d = document, test = (" + fallbackTestExpr + @");
(test || _d.write('" + fallbackElement.Replace("<", "\\u003c").Replace(">", "\\u003e") + @"'));
})();
</script>
" + Environment.NewLine;
}
}
return(text ?? string.Empty);
}
