Function parse_path 

pub fn parse_path(spec: &str) -> Result<Vec<Seg>, String>

Parse a dotted/bracketed path; a leading . is optional. Keys are dot-separated; [N] selects an array index and [key=value] selects the object in an array whose key equals value.

Examples

use coding_tools::patch::{parse_path, Seg};

assert_eq!(
    parse_path("a[2].c").unwrap(),
    vec![Seg::Key("a".into()), Seg::Index(2), Seg::Key("c".into())]
);
assert_eq!(
    parse_path(".servers[name=web].port").unwrap(),
    vec![
        Seg::Key("servers".into()),
        Seg::Select { key: "name".into(), value: "web".into() },
        Seg::Key("port".into()),
    ]
);
assert!(parse_path("").is_err());
assert!(parse_path("a[x]").is_err()); // not an index and not key=value