Parses a filter string. Syntax is as follows:
Selector ::= `.`
| Sel Sel*
Sel ::= `.` Name `!`? `?`?
| `.` `[` String (`,` String)* `]` `!`? `?`?
| `.` `[` Integer (`,` Integer)* `]` `?`?
| `.` `[` Integer `:` Integer `]` `?`?
| `.` `[` `]` `?`?
Name ::= [a-zA-Z_][a-zA-Z0-9_]*
String ::= <a json string>
Integer ::= 0
| [1-9][0-9]*
- Companion:
- object
class Object
trait Matchable
class Any