Enum Json 

pub enum Json {
    Null,
    Bool(bool),
    Number(f64),
    String(String),
    Array(Vec<Json>),
    Object(BTreeMap<String, Json>),
}

A JSON value.

Variants

Null

null

Bool(bool)

true or false

Number(f64)

Any JSON number, held as f64.

String(String)

A string, already unescaped.

Array(Vec<Json>)

An array.

Object(BTreeMap<String, Json>)

An object. Ordered so that output is deterministic.

Implementations

impl Json

pub fn get(&self, key: &str) -> Option<&Json>

Look up a key, if this is an object.

pub fn as_str(&self) -> Option<&str>

Borrow as a string, if this is one.

pub fn as_i64(&self) -> Option<i64>

Read as an i64, if this is a number.

pub fn as_array(&self) -> Option<&[Json]>

Read as a slice of elements, if this is an array.

Returns None for a non-array rather than an empty slice, so a caller can tell “not an array” from “an array with nothing in it” — a distinction that matters when the value came from somewhere else.

pub fn as_f64(&self) -> Option<f64>

Read as an f64, if this is a number.

Json::as_i64 truncates; this does not, so a caller that needs the value as written has somewhere to get it.

pub fn as_bool(&self) -> Option<bool>

Read as a bool, if this is one.

pub fn object<const N: usize>(pairs: [(&str, Json); N]) -> Json

Build an object from key-value pairs.

pub fn str(s: impl Into<String>) -> Json

Convenience constructor for a string value.

pub fn num(n: impl Into<f64>) -> Json

Convenience constructor for a numeric value.

Trait Implementations

impl Clone for Json

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Json

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

Formats the value using the given formatter.

impl Display for Json

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

Serialize to compact JSON text.

impl PartialEq for Json

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Json