58 lines
1.5 KiB
Rust
58 lines
1.5 KiB
Rust
pub mod bool {
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/// Function that always returns `true`, for use in `serde(default)` attributes.
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pub fn yes() -> bool {
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true
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}
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}
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pub mod string {
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use std::fmt::Display;
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use std::str::FromStr;
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use serde::{Deserialize, Deserializer, Serializer, de};
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pub fn serialize<T, S>(value: &T, serializer: S) -> Result<S::Ok, S::Error>
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where
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T: Display,
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S: Serializer,
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{
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serializer.collect_str(value)
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}
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pub fn deserialize<'de, T, D>(deserializer: D) -> Result<T, D::Error>
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where
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T: FromStr,
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T::Err: Display,
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D: Deserializer<'de>,
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{
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String::deserialize(deserializer)?
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.parse()
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.map_err(de::Error::custom)
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}
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}
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/// Return true if the given value is the default for that type.
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pub fn is_default<T: Default + PartialEq>(t: &T) -> bool {
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t == &T::default()
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}
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/// Deserialize a value, but if it fails, return the default value.
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pub fn ok_or_default<'de, T, D>(deserializer: D) -> Result<T, D::Error>
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where
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T: serde::Deserialize<'de> + Default,
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D: serde::Deserializer<'de>,
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{
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let v: serde_json::Value = serde::Deserialize::deserialize(deserializer)?;
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Ok(T::deserialize(v).unwrap_or_default())
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}
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/// Deserialize a value, but if it is `null`, return the default value.
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pub(crate) fn null_to_default<'de, D, T>(deserializer: D) -> Result<T, D::Error>
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where
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T: serde::Deserialize<'de> + Default,
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D: serde::Deserializer<'de>,
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{
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use serde::Deserialize as _;
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Ok(Option::deserialize(deserializer)?.unwrap_or_default())
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}
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