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use std::borrow::Cow;
use std::collections::BTreeMap;
pub use serde_json::Value as Json;
use serde_json::{Map, Number};
pub trait ToJson {
fn to_json(&self) -> Json;
}
impl ToJson for Json {
fn to_json(&self) -> Json {
self.clone()
}
}
macro_rules! to_json_impl_num {
($($t:ty), +) => (
$(impl ToJson for $t {
fn to_json(&self) -> Json {
Json::Number(Number::from(*self))
}
})+
)
}
to_json_impl_num! { isize, i8, i16, i32, i64, usize, u8, u16, u32, u64 }
impl ToJson for bool {
fn to_json(&self) -> Json {
Json::Bool(*self)
}
}
impl ToJson for str {
fn to_json(&self) -> Json {
Json::String(self.to_owned())
}
}
impl ToJson for String {
fn to_json(&self) -> Json {
Json::String(self.to_owned())
}
}
impl<'a> ToJson for Cow<'a, str> {
fn to_json(&self) -> Json {
Json::String(self.to_string())
}
}
impl<A: ToJson> ToJson for [A] {
fn to_json(&self) -> Json {
Json::Array(self.iter().map(|elt| elt.to_json()).collect())
}
}
impl<A: ToJson> ToJson for Vec<A> {
fn to_json(&self) -> Json {
Json::Array(self.iter().map(|elt| elt.to_json()).collect())
}
}
impl<'a, A: ToJson> ToJson for Cow<'a, [A]>
where
[A]: ToOwned,
{
fn to_json(&self) -> Json {
Json::Array(self.iter().map(|elt| elt.to_json()).collect())
}
}
impl<T: ToString, A: ToJson> ToJson for BTreeMap<T, A> {
fn to_json(&self) -> Json {
let mut d = Map::new();
for (key, value) in self {
d.insert(key.to_string(), value.to_json());
}
Json::Object(d)
}
}
impl<A: ToJson> ToJson for Option<A> {
fn to_json(&self) -> Json {
match *self {
None => Json::Null,
Some(ref value) => value.to_json(),
}
}
}
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