An implementation of the JSONPath A spec in Rust, with several extensions added on.
^, used as $.a.b.^ or $['a']['b'][^]. Matches the parent of
the currently selected object.$['a'][$.b.id] or $['a'][@.sum.id]. Evaluates the
subpath, then selects items with keys same as the result of the subpath.~, used at the end of the path as @.a.b~ or $['a']['b']~. Can be
used in filters to compare against the ID of a matched item. Doesn't yet work at
the top level.