57 lines
1.5 KiB
Rust
57 lines
1.5 KiB
Rust
use std::{collections::BTreeMap, convert::Infallible, fmt::Display};
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use serde::de::DeserializeOwned;
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/// See [`TryFromRaw`][try]. This trait is merely a convenience that is be implemented instead of
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/// [`TryFromRaw`][try] to get a [`TryFromRaw`][try] implementation with slightly less code if the
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/// conversion can't fail, that is, the raw type and `Self` are identical in definition.
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///
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/// [try]: trait.TryFromRaw.html
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pub trait FromRaw: Sized {
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/// The raw type.
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type Raw: DeserializeOwned;
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/// Converts the raw type to `Self`.
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fn from_raw(_: Self::Raw) -> Self;
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}
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/// Types corresponding to some item in the matrix spec. Types that implement this trait have a
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/// corresponding 'raw' type, a potentially invalid representation that can be converted to `Self`.
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pub trait TryFromRaw: Sized {
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/// The raw type.
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type Raw: DeserializeOwned;
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/// The error type returned if conversion fails.
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type Err: Display;
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/// Tries to convert the raw type to `Self`.
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fn try_from_raw(_: Self::Raw) -> Result<Self, Self::Err>;
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}
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impl FromRaw for serde_json::Value {
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type Raw = Self;
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fn from_raw(raw: Self) -> Self {
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raw
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}
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}
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impl<K, V> FromRaw for BTreeMap<K, V>
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where
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Self: DeserializeOwned,
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{
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type Raw = Self;
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fn from_raw(raw: Self) -> Self {
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raw
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}
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}
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impl<T: FromRaw> TryFromRaw for T {
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type Raw = <T as FromRaw>::Raw;
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type Err = Infallible;
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fn try_from_raw(raw: Self::Raw) -> Result<Self, Self::Err> {
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Ok(Self::from_raw(raw))
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}
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}
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