74 lines
1.9 KiB
Rust
74 lines
1.9 KiB
Rust
#![allow(clippy::trait_duplication_in_bounds)] // https://github.com/rust-lang/rust-clippy/issues/8757
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use serde::{Deserialize, Deserializer};
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use std::fmt::{self, Display};
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use std::marker::PhantomData;
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use std::str::FromStr;
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pub struct NumberVisitor<T> {
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marker: PhantomData<T>,
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}
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impl<'de, T> serde::de::Visitor<'de> for NumberVisitor<T>
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where
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T: TryFrom<u64> + TryFrom<i64> + FromStr,
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<T as TryFrom<u64>>::Error: Display,
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<T as TryFrom<i64>>::Error: Display,
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<T as FromStr>::Err: Display,
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{
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type Value = T;
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fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
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formatter.write_str("an integer or string")
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}
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fn visit_u64<E>(self, v: u64) -> Result<Self::Value, E>
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where
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E: serde::de::Error,
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{
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T::try_from(v).map_err(serde::de::Error::custom)
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}
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fn visit_i64<E>(self, v: i64) -> Result<Self::Value, E>
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where
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E: serde::de::Error,
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{
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T::try_from(v).map_err(serde::de::Error::custom)
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}
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fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
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where
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E: serde::de::Error,
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{
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v.parse().map_err(serde::de::Error::custom)
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}
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}
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fn deserialize_integer_or_string<'de, D, T>(deserializer: D) -> Result<T, D::Error>
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where
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D: Deserializer<'de>,
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T: TryFrom<u64> + TryFrom<i64> + FromStr,
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<T as TryFrom<u64>>::Error: Display,
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<T as TryFrom<i64>>::Error: Display,
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<T as FromStr>::Err: Display,
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{
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deserializer.deserialize_any(NumberVisitor {
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marker: PhantomData,
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})
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}
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#[derive(Deserialize, Debug)]
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pub struct Struct {
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#[serde(deserialize_with = "deserialize_integer_or_string")]
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pub i: i64,
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}
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#[test]
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fn test() {
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let j = r#" {"i":100} "#;
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println!("{:?}", serde_json::from_str::<Struct>(j).unwrap());
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let j = r#" {"i":"100"} "#;
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println!("{:?}", serde_json::from_str::<Struct>(j).unwrap());
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}
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