66 lines
1.9 KiB
Rust

//! De-/serialization helpers for other ruma crates
use serde::de::{Deserialize, IntoDeserializer};
pub mod can_be_empty;
mod canonical_json;
mod cow;
pub mod duration;
pub mod empty;
pub mod json_string;
pub mod single_element_seq;
pub mod test;
pub mod time;
pub mod urlencoded;
pub use can_be_empty::{is_empty, CanBeEmpty};
pub use canonical_json::{
to_string as to_canonical_json_string, value::CanonicalJsonValue, Error as CanonicalJsonError,
};
pub use cow::deserialize_cow_str;
pub use empty::vec_as_map_of_empty;
/// Check whether a value is equal to its default value.
pub fn is_default<T: Default + PartialEq>(val: &T) -> bool {
val == &T::default()
}
/// Simply returns `true`.
///
/// Useful for `#[serde(default = ...)]`.
pub fn default_true() -> bool {
true
}
/// Simplfy dereferences the given bool.
///
/// Useful for `#[serde(skip_serializing_if = ...)]`
#[allow(clippy::trivially_copy_pass_by_ref)]
pub fn is_true(b: &bool) -> bool {
*b
}
/// Serde deserialization decorator to map empty Strings to None,
/// and forward non-empty Strings to the Deserialize implementation for T.
/// Useful for the typical
/// "A room with an X event with an absent, null, or empty Y field
/// should be treated the same as a room with no such event."
/// formulation in the spec.
///
/// To be used like this:
/// `#[serde(deserialize_with = "empty_string_as_none")]`
/// Relevant serde issue: https://github.com/serde-rs/serde/issues/1425
pub fn empty_string_as_none<'de, D, T>(de: D) -> Result<Option<T>, D::Error>
where
D: serde::Deserializer<'de>,
T: serde::Deserialize<'de>,
{
let opt = Option::<String>::deserialize(de)?;
match opt.as_deref() {
None | Some("") => Ok(None),
// If T = String, like in m.room.name, the second deserialize is actually superfluous.
// TODO: optimize that somehow?
Some(s) => T::deserialize(s.into_deserializer()).map(Some),
}
}