internal static bool TryParse(ReadOnlySpan <char> expr, out int advance, out JsonPathNode node)
{
advance = default;
node = default;
if (expr.Length <= 3)
{
return(false);
}
if (expr[0] != '[')
{
return(false);
}
int i = expr.IndexOf(']');
if (i == -1)
{
return(false);
}
if (!int.TryParse(expr.Slice(1, i - 1).ToString(), out int index))
{
return(false);
}
advance = i + 1;
node = new JsonPathIndexSelectorNode()
{
Index = index
};
return(true);
}
private IEnumerable <JsonPathNode> ParseNodes(ReadOnlyMemory <char> exprMem)
{
ReadOnlySpan <char> expr;
while (!exprMem.IsEmpty)
{
expr = exprMem.Span;
JsonPathNode node = Parse(ref expr);
exprMem = expr.ToArray();
yield return(node);
}
}
internal static bool TryParse(ReadOnlySpan <char> expr, out int advance, out JsonPathNode node)
{
advance = default;
node = default;
if (expr.Length != 1 || expr[0] != '*')
{
return(false);
}
advance = expr.Length;
node = new JsonPathFilterWildcardNode();
return(true);
}
internal static bool TryParse(ReadOnlySpan <char> expr, out int advance, out JsonPathNode node)
{
advance = default;
node = default;
if (expr.Length <= 3)
{
return(false);
}
if (expr[1] == '\'')
{
return(false);
}
if (expr[0] != '[')
{
return(false);
}
int nesting = 1;
int i = 1;
for (; i < expr.Length && nesting != 0; ++i)
{
if (expr[i] == '[')
{
++nesting;
}
else if (expr[i] == ']')
{
--nesting;
}
}
if (nesting != 0)
{
return(false);
}
advance = expr.Length;
node = new JsonPathItemsSelectorNode(expr.Slice(i))
{
FilterRoot = new JsonPathFilterRootNode(expr.Slice(1, i - 2))
};
return(true);
}
internal static bool TryParse(ReadOnlySpan <char> expr, out int advance, out JsonPathNode node)
{
advance = default;
node = default;
if (expr.Length < 4)
{
return(false);
}
if (!expr.StartsWith("?(".AsSpan()))
{
return(false);
}
if (expr[expr.Length - 1] != ')')
{
return(false);
}
throw new NotImplementedException();
return(true);
}
internal static bool TryParse(ReadOnlySpan <char> expr, out int advance, out JsonPathNode node)
{
advance = default;
node = default;
if (expr.Length <= 2)
{
return(false);
}
if (expr[1] == '*')
{
return(false);
}
if (expr[1] == '.')
{
return(false);
}
if (expr[0] == '.')
{
Match identifier = CSharpIdentifierRegex.Match(expr.Slice(1).ToString());
if (!identifier.Success)
{
return(false);
}
advance = identifier.Length + 1;
node = new JsonPathPropertySelectorNode()
{
PropertyName = identifier.Value
};
return(true);
}
if (expr[0] == '[' && expr[1] == '\'')
{
Match identifier = CSharpIdentifierRegex.Match(expr.Slice(2).ToString());
if (!identifier.Success)
{
return(false);
}
if (!expr.Slice(identifier.Length + 2).StartsWith("']".AsSpan()))
{
return(false);
}
advance = identifier.Length + 4;
node = new JsonPathPropertySelectorNode()
{
PropertyName = identifier.Value
};
return(true);
}
return(false);
}
