static SrcSet _AttributeKeyValuesToSrcSet(Dictionary <string, string> kvs)
{
if (kvs.IsNulle())
{
return(null);
}
string src = kvs.V("src");
string srcSet = kvs.V("srcset");
if (src.IsNulle())
{
return(null);
}
var srcImg = new SrcSetImg()
{
Url = src,
Size = kvs.V("width").ToInt(0),
SizeType = SrcSizeType.Width
};
SrcSet srcset = new SrcSet()
{
Src = srcImg,
Sizes = kvs.V("sizes"),
SrcSets = SrcSet.ParseSrcSets(srcSet, out SrcSizeType sizeType),
SrcSetsSizeType = sizeType
};
srcset.InitValues();
return(srcset);
}
/// <summary>
/// Searches for the *first* `img` tag within the input string (ideally a content /
/// description field within an RSS item).
/// </summary>
/// <param name="html"></param>
/// <param name="contentSettings"></param>
/// <param name="maxStartIndexOfImgTag"></param>
public SrcSet GetFirstImageTagFromHtmlContent(
string html,
SFContentConversionSettings contentSettings,
int maxStartIndexOfImgTag = -1)
{
if (html.IsNulle() || maxStartIndexOfImgTag < 0 || !contentSettings.GetFirstImageTagFromHtml)
{
return(null);
}
int maxSearchLen = html.Length;
if (maxStartIndexOfImgTag >= 0)
{
maxSearchLen = (maxStartIndexOfImgTag + 15).Min(html.Length); // 15, just a rough min after start of img tag, still need an href + the url itself...
}
int imgIdx = html.IndexOf("<img ", 0, maxSearchLen);
if (imgIdx < 0)
{
return(null);
}
Dictionary <string, string> imgAttributes = contentSettings
.GetFirstImageTagAttributesFromHtml(html, imgIdx);
if (imgAttributes.IsNulle() || !imgAttributes.ContainsKey("src"))
{
return(null);
}
SrcSet srcSet = _AttributeKeyValuesToSrcSet(imgAttributes);
return(srcSet);
}