65 lines
2.2 KiB
Rust
65 lines
2.2 KiB
Rust
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//! Contains extensions of `serde` and internal reexports.
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#[cfg(feature = "serde")]
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#[doc(hidden)]
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pub use serde::{de, ser, Deserialize, Deserializer, Serialize, Serializer};
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/// Converts given error type to a type implementing [`de::Error`].
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///
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/// This is used in [`Deserialize`] implementations to convert specialized errors into serde
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/// errors.
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#[cfg(feature = "serde")]
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pub trait IntoDeError: Sized {
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/// Converts to deserializer error possibly outputting vague message.
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///
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/// This method is allowed to return a vague error message if the error type doesn't contain
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/// enough information to explain the error precisely.
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fn into_de_error<E: de::Error>(self, expected: Option<&dyn de::Expected>) -> E;
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/// Converts to deserializer error without outputting vague message.
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///
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/// If the error type doesn't contain enough information to explain the error precisely this
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/// should return `Err(self)` allowing the caller to use its information instead.
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fn try_into_de_error<E>(self, expected: Option<&dyn de::Expected>) -> Result<E, Self>
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where
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E: de::Error,
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{
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Ok(self.into_de_error(expected))
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}
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}
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#[cfg(feature = "serde")]
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mod impls {
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use super::*;
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impl IntoDeError for core::convert::Infallible {
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fn into_de_error<E: de::Error>(self, _expected: Option<&dyn de::Expected>) -> E {
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match self {}
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}
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}
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impl IntoDeError for core::num::ParseIntError {
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fn into_de_error<E: de::Error>(self, expected: Option<&dyn de::Expected>) -> E {
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self.try_into_de_error(expected).unwrap_or_else(|_| {
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let expected = expected.unwrap_or(&"an integer");
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E::custom(format_args!("invalid string, expected {}", expected))
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})
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}
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fn try_into_de_error<E>(self, expected: Option<&dyn de::Expected>) -> Result<E, Self>
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where
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E: de::Error,
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{
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use core::num::IntErrorKind::Empty;
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let expected = expected.unwrap_or(&"an integer");
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match self.kind() {
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Empty => Ok(E::invalid_value(de::Unexpected::Str(""), expected)),
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_ => Err(self),
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}
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}
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}
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}
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