/// <summary>
/// Parses a JSON Pointer from a string.
/// </summary>
/// <param name="source">The source string.</param>
/// <param name="pointerKind">(optional) Restricts the kind of pointer. <see cref="JsonPointerKind.Unspecified"/> (default) allows both.</param>
/// <returns>A JSON Pointer.</returns>
/// <exception cref="ArgumentNullException"><paramref name="source"/> is null.</exception>
/// <exception cref="PointerParseException"><paramref name="source"/> does not contain a valid pointer or contains a pointer of the wrong kind.</exception>
public static JsonPointer Parse(string source, JsonPointerKind pointerKind = JsonPointerKind.Unspecified)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
if (source == string.Empty)
{
return(Empty);
}
if (source == "#")
{
return(UrlEmpty);
}
bool isUriEncoded;
var parts = source.Split('/');
var i = 0;
if (parts[0] == "#" || parts[0] == string.Empty)
{
isUriEncoded = parts[0] == "#";
i++;
}
else
{
throw new PointerParseException("Pointer must start with either `#` or `/` or be empty");
}
switch (pointerKind)
{
case JsonPointerKind.Unspecified:
break;
case JsonPointerKind.Plain:
if (isUriEncoded)
{
throw new PointerParseException("Pointer is URI-encoded, but plain was expected.");
}
break;
case JsonPointerKind.UriEncoded:
if (!isUriEncoded)
{
throw new PointerParseException("Pointer is plain, but URI-encoded was expected.");
}
break;
default:
throw new ArgumentOutOfRangeException(nameof(pointerKind), pointerKind, null);
}
var segments = new PointerSegment[parts.Length - i];
for (; i < parts.Length; i++)
{
segments[i - 1] = PointerSegment.Parse(parts[i], isUriEncoded);
}
return(new JsonPointer
{
_source = source,
_segments = segments,
Kind = isUriEncoded ? JsonPointerKind.UriEncoded : JsonPointerKind.Plain
});
}
/// <summary>
/// Parses a JSON Pointer from a string.
/// </summary>
/// <param name="source">The source string.</param>
/// <param name="pointer">The resulting pointer.</param>
/// <param name="pointerKind">(optional) Restricts the kind of pointer. <see cref="JsonPointerKind.Unspecified"/> (default) allows both.</param>
/// <returns><code>true</code> if the parse was successful; <code>false</code> otherwise.</returns>
/// <exception cref="ArgumentNullException"><paramref name="source"/> is null.</exception>
public static bool TryParse(string source, out JsonPointer pointer, JsonPointerKind pointerKind = JsonPointerKind.Unspecified)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
if (source == string.Empty)
{
pointer = Empty;
return(true);
}
if (source == "#")
{
pointer = UrlEmpty;
return(true);
}
bool isUriEncoded;
var parts = source.Split('/');
var i = 0;
if (parts[0] == "#" || parts[0] == string.Empty)
{
isUriEncoded = parts[0] == "#";
i++;
}
else
{
pointer = default;
return(false);
}
switch (pointerKind)
{
case JsonPointerKind.Unspecified:
break;
case JsonPointerKind.Plain:
if (isUriEncoded)
{
pointer = default;
return(false);
}
break;
case JsonPointerKind.UriEncoded:
if (!isUriEncoded)
{
pointer = default;
return(false);
}
break;
default:
throw new ArgumentOutOfRangeException(nameof(pointerKind), pointerKind, null);
}
var segments = new PointerSegment[parts.Length - i];
for (; i < parts.Length; i++)
{
var part = parts[i];
if (!PointerSegment.TryParse(part, isUriEncoded, out var segment))
{
pointer = default;
return(false);
}
segments[i - 1] = segment;
}
pointer = new JsonPointer
{
_source = source,
_segments = segments,
Kind = isUriEncoded ? JsonPointerKind.UriEncoded : JsonPointerKind.Plain
};
return(true);
}
