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use std::{collections::HashMap, convert::TryInto}; use json::{JsonValue, object::Object}; #[cfg(feature="derive")] pub use decent_serde_json_derive_alternative::{FromJson, ToJson}; pub trait FromJson : Sized { fn from_json(json: &JsonValue) -> Option<Self>; } pub trait ToJson { fn to_json(&self) -> JsonValue; } macro_rules! impl_to_json_numbers { ($x: ty) => { impl ToJson for $x { fn to_json(&self) -> JsonValue { JsonValue::Number((*self).into()) } } }; } impl_to_json_numbers!(u8); impl_to_json_numbers!(u16); impl_to_json_numbers!(u32); impl_to_json_numbers!(u64); impl_to_json_numbers!(usize); impl_to_json_numbers!(i8); impl_to_json_numbers!(i16); impl_to_json_numbers!(i32); impl_to_json_numbers!(i64); impl_to_json_numbers!(isize); impl_to_json_numbers!(f32); impl_to_json_numbers!(f64); impl ToJson for String { fn to_json(&self) -> JsonValue { JsonValue::String(self.clone()) } } impl ToJson for bool { fn to_json(&self) -> JsonValue { JsonValue::Boolean(*self) } } impl<T> ToJson for Vec<T> where T: ToJson { fn to_json(&self) -> JsonValue { JsonValue::Array(self.iter().map(|x| x.to_json()).collect()) } } impl<V> ToJson for HashMap<String, V> where V: ToJson { fn to_json(&self) -> JsonValue { let mut o = Object::new(); for (key, value) in self { o.insert(key, value.to_json()) } JsonValue::Object(o) } } impl<T> ToJson for Option<T> where T: ToJson { fn to_json(&self) -> JsonValue { match self { Some(x) => { x.to_json() } None => { JsonValue::Null } } } } impl<T> ToJson for Box<T> where T: ToJson { fn to_json(&self) -> JsonValue { self.as_ref().to_json() } } macro_rules! impl_from_json_numbers { ($x: ty) => { impl FromJson for $x { fn from_json(json: &JsonValue) -> Option<Self> { if let JsonValue::Number(x) = json { (*x).try_into().ok() } else { None } } } }; } impl_from_json_numbers!(u8); impl_from_json_numbers!(u16); impl_from_json_numbers!(u32); impl_from_json_numbers!(u64); impl_from_json_numbers!(usize); impl_from_json_numbers!(i8); impl_from_json_numbers!(i16); impl_from_json_numbers!(i32); impl_from_json_numbers!(i64); impl_from_json_numbers!(isize); impl_from_json_numbers!(f32); impl_from_json_numbers!(f64); impl FromJson for String { fn from_json(json: &JsonValue) -> Option<Self> { if let JsonValue::String(x) = json { Some(x.clone()) } else if let JsonValue::Short(x) = json { Some(x.to_string()) } else { None } } } impl FromJson for bool { fn from_json(json: &JsonValue) -> Option<Self> { if let JsonValue::Boolean(x) = json { Some(*x) } else { None } } } impl<T> FromJson for Vec<T> where T: FromJson { fn from_json(json: &JsonValue) -> Option<Self> { if let JsonValue::Array(xs) = json { let mut res = vec![]; for x in xs.into_iter() { if let Some(x) = T::from_json(x) { res.push(x); } else { return None } } Some(res) } else { None } } } impl<V> FromJson for HashMap<String, V> where V: FromJson { fn from_json(json: &JsonValue) -> Option<Self> { if let JsonValue::Object(o) = json { let mut res = HashMap::new(); for (key, value) in o.iter() { if let Some(value) = V::from_json(value) { res.insert(key.to_string(), value); } else { return None } } Some(res) } else { None } } } impl<T> FromJson for Option<T> where T: FromJson { fn from_json(json: &JsonValue) -> Option<Self> { if let JsonValue::Null = json { Some(None) } else if let Some(value) = T::from_json(json) { Some(Some(value)) } else { None } } } impl<T> FromJson for Box<T> where T: FromJson { fn from_json(json: &JsonValue) -> Option<Self> { T::from_json(json).map(Box::new) } }