Struct jsonpath_lib::Compiled

pub struct Compiled { /* fields omitted */ }

A pre-compiled expression.

Calling the select function of this struct will re-use the existing, compiled expression.

Example

extern crate jsonpath_lib as jsonpath;
#[macro_use] extern crate serde_json;

let mut first_friend = jsonpath::Compiled::compile("$..friends[0]").unwrap();

let json_obj = json!({
    "school": {
        "friends": [
            {"name": "친구1", "age": 20},
            {"name": "친구2", "age": 20}
        ]
    },
    "friends": [
        {"name": "친구3", "age": 30},
        {"name": "친구4"}
]});

// call a first time

let json = first_friend.select(&json_obj).unwrap();

assert_eq!(json, vec![
    &json!({"name": "친구3", "age": 30}),
    &json!({"name": "친구1", "age": 20})
]);

// call a second time

let json = first_friend.select(&json_obj).unwrap();

assert_eq!(json, vec![
    &json!({"name": "친구3", "age": 30}),
    &json!({"name": "친구1", "age": 20})
]);

Implementations

impl Compiled

pub fn compile(path: &str) -> Result<Compiled, String>

Compile a path expression and return a compiled instance.

If parsing the path fails, it will return an error.

pub fn select<'a>(
    &self,
    value: &'a Value
) -> Result<Vec<&'a Value>, JsonPathError>

Execute the select operation on the pre-compiled path.

Trait Implementations

impl Clone for Compiled

fn clone(&self) -> Compiled

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Compiled

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.