/// <summary>
/// Parses a JSON Pointer from a string.
/// </summary>
/// <param name="source">The source string.</param>
/// <param name="relativePointer">The resulting relative pointer.</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 RelativeJsonPointer relativePointer)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
if (string.IsNullOrWhiteSpace(source))
{
relativePointer = default;
return(false);
}
var span = source.AsSpan();
int i = 0;
while (i < span.Length && char.IsDigit(span[i]))
{
i++;
}
if (i == 0)
{
relativePointer = default;
return(false);
}
var number = uint.Parse(span.Slice(0, i).ToString());
if (i == span.Length)
{
relativePointer = new RelativeJsonPointer(number, JsonPointer.Empty);
return(true);
}
if (span[i] == '#')
{
if (i + 1 < span.Length)
{
relativePointer = default;
return(false);
}
relativePointer = new RelativeJsonPointer(number);
return(true);
}
if (span[i] != '/')
{
relativePointer = default;
return(false);
}
if (!JsonPointer.TryParse(span.Slice(i).ToString(), out var pointer))
{
relativePointer = default;
return(false);
}
relativePointer = new RelativeJsonPointer(number, pointer);
return(true);
}
/// <summary>
/// Parses a JSON Pointer from a string.
/// </summary>
/// <param name="source">The source string.</param>
/// <param name="relativePointer">The resulting relative pointer.</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 RelativeJsonPointer relativePointer)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
if (string.IsNullOrWhiteSpace(source))
{
relativePointer = default;
return(false);
}
var span = source.AsSpan();
int i = 0;
while (i < span.Length && char.IsDigit(span[i]))
{
i++;
}
if (i == 0)
{
relativePointer = default;
return(false);
}
var parentSteps = uint.Parse(span.Slice(0, i).ToString());
if (i == span.Length)
{
relativePointer = new RelativeJsonPointer(parentSteps, JsonPointer.Empty);
return(true);
}
int indexManipulation = 0;
if (span[i] == '+' || span[i] == '-')
{
var sign = span[i] == '+' ? 1 : -1;
i++;
var start = i;
while (i < span.Length && char.IsDigit(span[i]))
{
i++;
}
indexManipulation = sign * int.Parse(span.Slice(start, i - start).ToString());
if (i == span.Length)
{
relativePointer = new RelativeJsonPointer(parentSteps, indexManipulation, JsonPointer.Empty);
return(true);
}
}
if (span[i] == '#')
{
if (i + 1 < span.Length)
{
relativePointer = default;
return(false);
}
relativePointer = new RelativeJsonPointer(parentSteps, indexManipulation);
return(true);
}
if (span[i] != '/')
{
relativePointer = default;
return(false);
}
if (!JsonPointer.TryParse(span.Slice(i).ToString(), out var pointer))
{
relativePointer = default;
return(false);
}
relativePointer = new RelativeJsonPointer(parentSteps, indexManipulation, pointer);
return(true);
}
