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//! ```
//! #[macro_use]
//! extern crate serde_derive;
//!
//! extern crate toml;
//! use toml::spanned::Spanned;
//!
//! #[derive(Deserialize)]
//! struct Value {
//! s: Spanned<String>,
//! }
//!
//! fn main() {
//! let t = "s = \"value\"\n";
//!
//! let u: Value = toml::from_str(t).unwrap();
//!
//! assert_eq!(u.s.start, 4);
//! assert_eq!(u.s.end, 11);
//! }
//! ```
use serde::{de, ser};
use std::fmt;
#[doc(hidden)]
pub const NAME: &'static str = "$__toml_private_Spanned";
#[doc(hidden)]
pub const START: &'static str = "$__toml_private_start";
#[doc(hidden)]
pub const END: &'static str = "$__toml_private_end";
#[doc(hidden)]
pub const VALUE: &'static str = "$__toml_private_value";
/// A spanned value, indicating the range at which it is defined in the source.
#[derive(Debug)]
pub struct Spanned<T> {
/// The start range.
pub start: usize,
/// The end range (exclusive).
pub end: usize,
/// The spanned value.
pub value: T,
}
impl<'de, T> de::Deserialize<'de> for Spanned<T>
where T: de::Deserialize<'de>
{
fn deserialize<D>(deserializer: D) -> Result<Spanned<T>, D::Error>
where D: de::Deserializer<'de>
{
struct SpannedVisitor<T>(::std::marker::PhantomData<T>);
impl<'de, T> de::Visitor<'de> for SpannedVisitor<T>
where T: de::Deserialize<'de>
{
type Value = Spanned<T>;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("a TOML spanned")
}
fn visit_map<V>(self, mut visitor: V) -> Result<Spanned<T>, V::Error>
where V: de::MapAccess<'de>
{
if visitor.next_key()? != Some(START) {
return Err(de::Error::custom("spanned start key not found"))
}
let start: usize = visitor.next_value()?;
if visitor.next_key()? != Some(END) {
return Err(de::Error::custom("spanned end key not found"))
}
let end: usize = visitor.next_value()?;
if visitor.next_key()? != Some(VALUE) {
return Err(de::Error::custom("spanned value key not found"))
}
let value: T = visitor.next_value()?;
Ok(Spanned {
start: start,
end: end,
value: value
})
}
}
let visitor = SpannedVisitor(::std::marker::PhantomData);
static FIELDS: [&'static str; 3] = [START, END, VALUE];
deserializer.deserialize_struct(NAME, &FIELDS, visitor)
}
}
impl<T: ser::Serialize> ser::Serialize for Spanned<T> {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: ser::Serializer,
{
self.value.serialize(serializer)
}
}
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