jsonptr - JSON Pointers for Rust

Usage

Resolve values

Pointer::resolve

use jsonptr::Pointer;
use serde_json::json;
let mut data = json!({"foo": { "bar": "baz" }});
let ptr = Pointer::new(["foo", "bar"]);
let bar = ptr.resolve(&data).unwrap();
assert_eq!(bar, "baz");

Resolve::resolve

use jsonptr::{Pointer, Resolve};
use serde_json::json;
let mut data = json!({ "foo": { "bar": "baz" }});
let ptr = Pointer::new(["foo", "bar"]);
let bar = data.resolve(&ptr).unwrap();
assert_eq!(bar, "baz");

ResolveMut::resolve_mut

use jsonptr::{Pointer, ResolveMut};
use serde_json::json;
let ptr = Pointer::try_from("/foo/bar").unwrap();
let mut data = json!({ "foo": { "bar": "baz" }});
let mut bar = data.resolve_mut(&ptr).unwrap();
assert_eq!(bar, "baz");

Assign

Pointer::assign

use jsonptr::Pointer;
use serde_json::json;
let ptr = Pointer::try_from("/foo/bar").unwrap();
let mut data = json!({});
let _previous = ptr.assign(&mut data, "qux").unwrap();
assert_eq!(data, json!({ "foo": { "bar": "qux" }}))

Assign::asign

use jsonptr::{Assign, Pointer};
use serde_json::json;
let ptr = Pointer::try_from("/foo/bar").unwrap();
let mut data = json!({});
let _previous = data.assign(&ptr, "qux").unwrap();
assert_eq!(data, json!({ "foo": { "bar": "qux" }}))

Delete

Pointer::delete

use jsonptr::Pointer;
use serde_json::json;
let mut data = json!({ "foo": { "bar": { "baz": "qux" } } });
let ptr = Pointer::new(&["foo", "bar", "baz"]);
assert_eq!(ptr.delete(&mut data), Some("qux".into()));
assert_eq!(data, json!({ "foo": { "bar": {} } }));
// unresolved pointers return None
let mut data = json!({});
assert_eq!(ptr.delete(&mut data), None);

Delete::delete

use jsonptr::{Pointer, Delete};
use serde_json::json;
let mut data = json!({ "foo": { "bar": { "baz": "qux" } } });
let ptr = Pointer::new(["foo", "bar", "baz"]);
assert_eq!(ptr.delete(&mut data), Some("qux".into()));
assert_eq!(data, json!({ "foo": { "bar": {} } }));
// replacing a root pointer replaces data with `Value::Null`
let ptr = Pointer::default();
let deleted = json!({ "foo": { "bar": {} } });
assert_eq!(data.delete(&ptr), Some(deleted));
assert!(data.is_null());

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