1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114

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"))
}