public static PathInfo Parse(string path)
{
if (path == "null")
{
return(Empty);
}
var originalPath = path;
var pathType = GetPathType(path);
var pathSubstring = new Substring(path);
var isValidHelperLiteral = true;
var isVariable = pathType == PathType.Variable;
var isInversion = pathType == PathType.Inversion;
var isBlockHelper = pathType == PathType.BlockHelper;
if (isVariable || isBlockHelper || isInversion)
{
isValidHelperLiteral = isBlockHelper || isInversion;
pathSubstring = new Substring(pathSubstring, 1);
}
var segments = new List <PathSegment>();
var pathParts = Substring.Split(pathSubstring, '/');
var extendedEnumerator = ExtendedEnumerator <Substring> .Create(pathParts);
using var container = StringBuilderPool.Shared.Use();
var buffer = container.Value;
while (extendedEnumerator.MoveNext())
{
var segment = extendedEnumerator.Current.Value;
if (buffer.Length != 0)
{
buffer.Append('/');
buffer.Append(in segment);
if (Substring.LastIndexOf(segment, ']', out var index) &&
!Substring.LastIndexOf(segment, '[', index, out _))
{
var chainSegment = GetPathChain(buffer.ToString());
if (chainSegment.Length > 1)
{
isValidHelperLiteral = false;
}
segments.Add(new PathSegment(segment, chainSegment));
buffer.Length = 0;
continue;
}
}
if (Substring.LastIndexOf(segment, '[', out var startIndex) &&
!Substring.LastIndexOf(segment, ']', startIndex, out _))
{
buffer.Append(in segment);
continue;
}
switch (segment.Length)
{
case 2 when segment[0] == '.' && segment[1] == '.':
public void LastIndexOf(string input, char trimChar, int expected)
{
var actual = Substring.LastIndexOf(input, trimChar);
Assert.Equal(expected, actual);
}