detrim 0.1.0

String deserializers customization for serde
Documentation 
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use alloc::{borrow::ToOwned as _, string::String};

use serde::{Deserialize as _, Deserializer};

/// Trims string during deserialization.
pub fn string<'a, D: Deserializer<'a>>(de: D) -> Result<String, D::Error> {
    String::deserialize(de).map(|val| val.trim().to_owned())
}

#[cfg(test)]
mod tests {
    use serde::Deserialize;

    use super::*;

    #[test]
    fn string() {
        #[derive(Debug, Deserialize, PartialEq, Eq)]
        struct Foo {
            #[serde(deserialize_with = "super::string")]
            foo: String,
        }

        impl Foo {
            fn new(foo: impl Into<String>) -> Self {
                Self { foo: foo.into() }
            }
        }

        serde_json::from_str::<Foo>(r#"{ "foo": 1 }"#).unwrap_err();
        serde_json::from_str::<Foo>(r#"{ "foo": bool }"#).unwrap_err();

        assert_eq!(
            Foo::new(""),
            serde_json::from_str(r#"{ "foo": "" }"#).unwrap(),
        );
        assert_eq!(
            Foo::new(""),
            serde_json::from_str(r#"{ "foo": " " }"#).unwrap(),
        );
        assert_eq!(
            Foo::new("bar"),
            serde_json::from_str(r#"{ "foo": "bar" }"#).unwrap(),
        );
        assert_eq!(
            Foo::new("bar"),
            serde_json::from_str(r#"{ "foo": " bar" }"#).unwrap(),
        );
        assert_eq!(
            Foo::new("bar"),
            serde_json::from_str(r#"{ "foo": "  bar" }"#).unwrap(),
        );
        assert_eq!(
            Foo::new("bar"),
            serde_json::from_str(r#"{ "foo": "bar " }"#).unwrap(),
        );
        assert_eq!(
            Foo::new("bar"),
            serde_json::from_str(r#"{ "foo": "  bar  " }"#).unwrap(),
        );
    }
}