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
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
//! Serializing Rust structures into TOML.
//!
//! This module contains all the Serde support for serializing Rust structures into TOML.

mod array;
mod key;
mod map;
mod pretty;
mod value;

pub(crate) use array::*;
pub(crate) use key::*;
pub(crate) use map::*;

use crate::visit_mut::VisitMut;

/// Errors that can occur when deserializing a type.
#[derive(Debug, Clone, PartialEq, Eq)]
#[non_exhaustive]
pub enum Error {
    /// Type could not be serialized to TOML
    UnsupportedType(Option<&'static str>),
    /// Value was out of range for the given type
    OutOfRange(Option<&'static str>),
    /// `None` could not be serialized to TOML
    UnsupportedNone,
    /// Key was not convertable to `String` for serializing to TOML
    KeyNotString,
    /// A serialized date was invalid
    DateInvalid,
    /// Other serialization error
    Custom(String),
}

impl Error {
    pub(crate) fn custom<T>(msg: T) -> Self
    where
        T: std::fmt::Display,
    {
        Error::Custom(msg.to_string())
    }
}

impl serde::ser::Error for Error {
    fn custom<T>(msg: T) -> Self
    where
        T: std::fmt::Display,
    {
        Self::custom(msg)
    }
}

impl std::fmt::Display for Error {
    fn fmt(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
        match self {
            Self::UnsupportedType(Some(t)) => write!(formatter, "unsupported {t} type"),
            Self::UnsupportedType(None) => write!(formatter, "unsupported rust type"),
            Self::OutOfRange(Some(t)) => write!(formatter, "out-of-range value for {t} type"),
            Self::OutOfRange(None) => write!(formatter, "out-of-range value"),
            Self::UnsupportedNone => "unsupported None value".fmt(formatter),
            Self::KeyNotString => "map key was not a string".fmt(formatter),
            Self::DateInvalid => "a serialized date was invalid".fmt(formatter),
            Self::Custom(s) => s.fmt(formatter),
        }
    }
}

impl From<crate::TomlError> for Error {
    fn from(e: crate::TomlError) -> Error {
        Self::custom(e)
    }
}

impl From<Error> for crate::TomlError {
    fn from(e: Error) -> crate::TomlError {
        Self::custom(e.to_string(), None)
    }
}

impl std::error::Error for Error {}

/// Serialize the given data structure as a TOML byte vector.
///
/// Serialization can fail if `T`'s implementation of `Serialize` decides to
/// fail, if `T` contains a map with non-string keys, or if `T` attempts to
/// serialize an unsupported datatype such as an enum, tuple, or tuple struct.
pub fn to_vec<T: ?Sized>(value: &T) -> Result<Vec<u8>, Error>
where
    T: serde::ser::Serialize,
{
    to_string(value).map(|e| e.into_bytes())
}

/// Serialize the given data structure as a String of TOML.
///
/// Serialization can fail if `T`'s implementation of `Serialize` decides to
/// fail, if `T` contains a map with non-string keys, or if `T` attempts to
/// serialize an unsupported datatype such as an enum, tuple, or tuple struct.
///
/// # Examples
///
/// ```
/// use serde::Serialize;
///
/// #[derive(Serialize)]
/// struct Config {
///     database: Database,
/// }
///
/// #[derive(Serialize)]
/// struct Database {
///     ip: String,
///     port: Vec<u16>,
///     connection_max: u32,
///     enabled: bool,
/// }
///
/// let config = Config {
///     database: Database {
///         ip: "192.168.1.1".to_string(),
///         port: vec![8001, 8002, 8003],
///         connection_max: 5000,
///         enabled: false,
///     },
/// };
///
/// let toml = toml_edit::ser::to_string(&config).unwrap();
/// println!("{}", toml)
/// ```
pub fn to_string<T: ?Sized>(value: &T) -> Result<String, Error>
where
    T: serde::ser::Serialize,
{
    to_document(value).map(|e| e.to_string())
}

/// Serialize the given data structure as a "pretty" String of TOML.
///
/// This is identical to `to_string` except the output string has a more
/// "pretty" output. See `ValueSerializer::pretty` for more details.
pub fn to_string_pretty<T: ?Sized>(value: &T) -> Result<String, Error>
where
    T: serde::ser::Serialize,
{
    let mut document = to_document(value)?;
    pretty::Pretty.visit_document_mut(&mut document);
    Ok(document.to_string())
}

/// Serialize the given data structure into a TOML document.
///
/// This would allow custom formatting to be applied, mixing with format preserving edits, etc.
pub fn to_document<T: ?Sized>(value: &T) -> Result<crate::Document, Error>
where
    T: serde::ser::Serialize,
{
    let value = value.serialize(ValueSerializer::new())?;
    let item = crate::Item::Value(value);
    let root = item
        .into_table()
        .map_err(|_| Error::UnsupportedType(None))?;
    Ok(root.into())
}

pub use value::ValueSerializer;