polyglot 0.2.1

A library for format-agnostic serialization
Documentation 
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use std::io;

use serde::de;

use crate::{Error, Format};

/// Deserialize a struct from a string in the specified format.
///
/// Obviously, only formats enabled with feature flags will be supported.
/// ## Example
/// ```
/// use polyglot::{de, Format};
/// use serde::Deserialize;
///
/// #[derive(Debug, Deserialize)]
/// struct Person {
///     pub age: i32
/// }
///
/// let p: Person = de::from_str("{\"age\": 42}", Format::JSON).unwrap();
/// assert_eq!(p.age, 42);
/// ```
pub fn from_str<T>(s: &str, format: Format) -> crate::Result<T>
where
    T: de::DeserializeOwned,
{
    #[cfg(feature = "json_fmt")]
    {
        if format == Format::JSON {
            return Ok(serde_json::from_str(s)?);
        }
    }

    #[cfg(feature = "msgpack_fmt")]
    {
        if format == Format::MsgPack {
            return Ok(rmp_serde::from_read_ref(s)?);
        }
    }

    #[cfg(feature = "toml_fmt")]
    {
        if format == Format::TOML {
            return Ok(toml::from_str(s)?);
        }
    }

    #[cfg(feature = "yaml_fmt")]
    {
        if format == Format::YAML {
            return Ok(serde_yaml::from_str(s)?);
        }
    }

    Err(Error::new("Library Error - Unimplemented Deserialize"))
}

/// Deserialize a struct from a reader in the specified format.
///
/// Obviously, only formats enabled with feature flags will be supported.
/// ## Example
/// ```
/// use std::io;
///
/// use polyglot::{de, Format};
/// use serde::Deserialize;
///
/// #[derive(Deserialize)]
/// pub struct Person {
///     pub age: i32,
/// }
///
/// let data = "{\"age\": 42}";
/// let p: Person = de::from_reader(data.as_bytes(), Format::JSON).unwrap();
/// assert_eq!(p.age, 42);
/// ```
pub fn from_reader<R, T>(mut rdr: R, format: Format) -> crate::Result<T>
where
    R: io::Read,
    T: de::DeserializeOwned,
{
    // TODO: Adapt mutability of rdr depending of implementation.
    #[cfg(feature = "json_fmt")]
    {
        if format == Format::JSON {
            return Ok(serde_json::from_reader(rdr)?);
        }
    }

    #[cfg(feature = "msgpack_fmt")]
    {
        if format == Format::MsgPack {
            return Ok(rmp_serde::from_read(rdr)?);
        }
    }

    #[cfg(feature = "toml_fmt")]
    {
        if format == Format::TOML {
            let mut raw = String::new();
            rdr.read_to_string(&mut raw)?;
            return Ok(toml::from_str(&raw)?);
        }
    }

    #[cfg(feature = "yaml_fmt")]
    {
        if format == Format::YAML {
            return Ok(serde_yaml::from_reader(rdr)?);
        }
    }

    Err(Error::new("Library Error - Unimplemented Deserialize"))
}