/// <summary>
/// Follows a JsonPointer and returns the target schema.
/// </summary>
/// <remarks>Does not support relative JSON Pointers</remarks>
/// <param name="schema">The root JSON Schema</param>
/// <param name="path">The path to follow</param>
/// <returns>The JSON Schema found by following the pointer</returns>
public static JsonSchema FollowReference(this JsonSchema schema, JsonPointer path)
{
IRefResolvable schemaSegment = schema;
foreach (var segment in path.Segments)
{
schemaSegment = schemaSegment.ResolvePointerSegment(segment.Value);
if (schemaSegment == null)
{
return(null);
}
}
return(schemaSegment as JsonSchema);
}
internal (JsonSchema, Uri) FindSubschema(JsonPointer pointer, Uri currentUri)
{
IRefResolvable resolvable = this;
for (var i = 0; i < pointer.Segments.Length; i++)
{
var segment = pointer.Segments[i];
var newResolvable = resolvable.ResolvePointerSegment(segment.Value);
if (newResolvable == null)
{
// TODO: document that this process does not consider `$id` in extraneous data
if (resolvable is JsonSchema subSchema &&
subSchema.OtherData != null &&
subSchema.OtherData.TryGetValue(segment.Value, out var element))
{
var newPointer = JsonPointer.Create(pointer.Segments.Skip(i + 1), true);
var value = newPointer.Evaluate(element);
var asSchema = FromText(value.ToString());
return(asSchema, currentUri);
}
return(null, currentUri);
}
if (newResolvable is JsonSchema schema && schema.Keywords != null)
{
var idKeyword = schema.Keywords.OfType <IdKeyword>().SingleOrDefault();
if (idKeyword != null && i != pointer.Segments.Length - 1)
{
currentUri = idKeyword.UpdateUri(currentUri);
}
}
resolvable = newResolvable;
}
if (!(resolvable is JsonSchema))
{
resolvable = resolvable.ResolvePointerSegment(null);
}
return(resolvable as JsonSchema, currentUri);
}
