60 lines
1.6 KiB
Rust
60 lines
1.6 KiB
Rust
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#![allow(clippy::assertions_on_result_states)]
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use serde::de::{
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Deserialize, Deserializer, EnumAccess, IgnoredAny, MapAccess, VariantAccess, Visitor,
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};
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use serde_json::json;
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use std::fmt;
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#[derive(Debug)]
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pub enum Enum {
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Variant { x: u8 },
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}
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impl<'de> Deserialize<'de> for Enum {
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fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
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where
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D: Deserializer<'de>,
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{
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struct EnumVisitor;
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impl<'de> Visitor<'de> for EnumVisitor {
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type Value = Enum;
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fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
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formatter.write_str("enum Enum")
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}
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fn visit_enum<A>(self, data: A) -> Result<Self::Value, A::Error>
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where
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A: EnumAccess<'de>,
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{
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let (IgnoredAny, variant) = data.variant()?;
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variant.struct_variant(&["x"], self)
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}
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fn visit_map<A>(self, mut data: A) -> Result<Self::Value, A::Error>
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where
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A: MapAccess<'de>,
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{
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let mut x = 0;
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if let Some((IgnoredAny, value)) = data.next_entry()? {
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x = value;
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}
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Ok(Enum::Variant { x })
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}
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}
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deserializer.deserialize_enum("Enum", &["Variant"], EnumVisitor)
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}
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}
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#[test]
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fn test() {
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let s = r#" {"Variant":{"x":0,"y":0}} "#;
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assert!(serde_json::from_str::<Enum>(s).is_err());
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let j = json!({"Variant":{"x":0,"y":0}});
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assert!(serde_json::from_value::<Enum>(j).is_err());
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}
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