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use std::fmt;
use serde::de;
use serde::ser;
use crate::map::Map;
use crate::Value;
/// Type representing a TOML table, payload of the `Value::Table` variant.
/// By default it is backed by a BTreeMap, enable the `preserve_order` feature
/// to use a LinkedHashMap instead.
pub type Table = Map<String, Value>;
impl Table {
/// Convert a `T` into `toml::Table`.
///
/// This conversion can fail if `T`'s implementation of `Serialize` decides to
/// fail, or if `T` contains a map with non-string keys.
pub fn try_from<T>(value: T) -> Result<Self, crate::ser::Error>
where
T: ser::Serialize,
{
value.serialize(crate::value::TableSerializer)
}
/// Interpret a `toml::Table` as an instance of type `T`.
///
/// This conversion can fail if the structure of the `Table` does not match the structure
/// expected by `T`, for example if `T` is a bool which can't be mapped to a `Table`. It can
/// also fail if the structure is correct but `T`'s implementation of `Deserialize` decides
/// that something is wrong with the data, for example required struct fields are missing from
/// the TOML map or some number is too big to fit in the expected primitive type.
pub fn try_into<'de, T>(self) -> Result<T, crate::de::Error>
where
T: de::Deserialize<'de>,
{
de::Deserialize::deserialize(self)
}
}
#[cfg(feature = "display")]
impl fmt::Display for Table {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
crate::ser::to_string(self)
.expect("Unable to represent value as string")
.fmt(f)
}
}
#[cfg(feature = "parse")]
impl std::str::FromStr for Table {
type Err = crate::de::Error;
fn from_str(s: &str) -> Result<Self, Self::Err> {
crate::from_str(s)
}
}
impl<'de> de::Deserializer<'de> for Table {
type Error = crate::de::Error;
fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, crate::de::Error>
where
V: de::Visitor<'de>,
{
Value::Table(self).deserialize_any(visitor)
}
#[inline]
fn deserialize_enum<V>(
self,
name: &'static str,
variants: &'static [&'static str],
visitor: V,
) -> Result<V::Value, crate::de::Error>
where
V: de::Visitor<'de>,
{
Value::Table(self).deserialize_enum(name, variants, visitor)
}
// `None` is interpreted as a missing field so be sure to implement `Some`
// as a present field.
fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, crate::de::Error>
where
V: de::Visitor<'de>,
{
Value::Table(self).deserialize_option(visitor)
}
fn deserialize_newtype_struct<V>(
self,
name: &'static str,
visitor: V,
) -> Result<V::Value, crate::de::Error>
where
V: de::Visitor<'de>,
{
Value::Table(self).deserialize_newtype_struct(name, visitor)
}
serde::forward_to_deserialize_any! {
bool u8 u16 u32 u64 i8 i16 i32 i64 f32 f64 char str string unit seq
bytes byte_buf map unit_struct tuple_struct struct
tuple ignored_any identifier
}
}
impl<'de> de::IntoDeserializer<'de, crate::de::Error> for Table {
type Deserializer = Self;
fn into_deserializer(self) -> Self {
self
}
}
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