Crate dyn_path

dyn_path

dyn_path is a set of macros that permit you access objects that have .get() methods that return Option<T> in a nested way.

It is as specific as it looks, but most libraries that parse data interchange languages have a “Value” that contains other “Value“s inside. And casually all the “Value“s have a .get() method, a generic .get() method in fact.

How does this work? Just like JavaScript.

use serde_json::json;
use dyn_path::dyn_access;

let object = json!({
    "very": {
        "nested": {
            "value": [
                "hello",
                "world"
            ]
        }
    }
});

let hello = dyn_access!(object.very.nested.value[0]).unwrap();
let world = dyn_access!(object.very.nested.value[1]).unwrap();

assert_eq!(hello, "hello");
assert_eq!(world, "world");

This is also useful for nested HashMaps but the difference is that you will actually get a compile time error if you are wrong with the type.

use std::collections::HashMap;
use dyn_path::dyn_access;

let map: HashMap<String, HashMap<String, HashMap<i32, ()>>> = HashMap::new();

dyn_access!(map.nested.value[&0]); // since we don't have any real value this will return None.

Check the available macro documentation to learn more about how to use the specific macros.

Macros

dyn_access

dyn_access

dyn_path

dyn_path