/// <summary>Finds all @context URLs in the given JSON-LD input.</summary>
/// <remarks>Finds all @context URLs in the given JSON-LD input.</remarks>
/// <param name="input">the JSON-LD input.</param>
/// <param name="urls">a map of URLs (url => false/@contexts).</param>
/// <param name="replace">true to replace the URLs in the given input with the</param>
/// <contexts>from the urls map, false not to.</contexts>
/// <returns>true if new URLs to resolve were found, false if not.</returns>
private static bool FindContextUrls(JToken input, JObject urls, bool replace)
{
var count = urls.Count;
if (input is JArray)
{
foreach (var i in (JArray)input)
{
FindContextUrls(i, urls, replace);
}
return(count < urls.Count);
}
if (input is JObject)
{
foreach (var key in input.GetKeys())
{
if (!"@context".Equals(key))
{
FindContextUrls(((JObject)input)[key], urls, replace);
continue;
}
// get @context
var ctx = ((JObject)input)[key];
// array @context
if (ctx is JArray)
{
var length = ((JArray)ctx).Count;
for (var i = 0; i < length; i++)
{
var _ctx = ((JArray)ctx)[i];
if (_ctx.Type == JTokenType.String)
{
if (replace)
{
_ctx = urls[(string)_ctx];
if (_ctx is JArray)
{
// add flattened context
((JArray)ctx).RemoveAt(i);
Collections.AddAllObj((JArray)ctx, (ICollection)_ctx);
i += ((JArray)_ctx).Count;
length += ((JArray)_ctx).Count;
}
else
{
((JArray)ctx)[i] = _ctx;
}
}
else
{
// @context Url found
if (!urls.ContainsKey((string)_ctx))
{
urls[(string)_ctx] = false;
}
}
}
}
}
else
{
// string @context
if (ctx.Type == JTokenType.String)
{
if (replace)
{
((JObject)input)[key] = urls[(string)ctx];
}
else
{
// @context Url found
if (!urls.ContainsKey((string)ctx))
{
urls[(string)ctx] = false;
}
}
}
}
}
return(count < urls.Count);
}
return(false);
}
