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|
use serde::{de, ser};
use std::borrow::Borrow;
use std::cmp::Ordering;
use std::fmt;
use std::hash::{Hash, Hasher};
pub(crate) const NAME: &str = "$__milf_private_Spanned";
pub(crate) const START: &str = "$__milf_private_start";
pub(crate) const END: &str = "$__milf_private_end";
pub(crate) const VALUE: &str = "$__milf_private_value";
/// A spanned value, indicating the range at which it is defined in the source.
///
/// ```
/// use serde_derive::Deserialize;
/// use milf::Spanned;
///
/// #[derive(Deserialize)]
/// struct Value {
/// s: Spanned<String>,
/// }
///
/// fn main() {
/// let t = "s = \"value\"\n";
///
/// let u: Value = milf::from_str(t).unwrap();
///
/// assert_eq!(u.s.start(), 4);
/// assert_eq!(u.s.end(), 11);
/// assert_eq!(u.s.get_ref(), "value");
/// assert_eq!(u.s.into_inner(), String::from("value"));
/// }
/// ```
#[derive(Clone, Debug)]
pub struct Spanned<T> {
/// The start range.
start: usize,
/// The end range (exclusive).
end: usize,
/// The spanned value.
value: T,
}
impl<T> Spanned<T> {
/// Access the start of the span of the contained value.
pub fn start(&self) -> usize {
self.start
}
/// Access the end of the span of the contained value.
pub fn end(&self) -> usize {
self.end
}
/// Get the span of the contained value.
pub fn span(&self) -> (usize, usize) {
(self.start, self.end)
}
/// Consumes the spanned value and returns the contained value.
pub fn into_inner(self) -> T {
self.value
}
/// Returns a reference to the contained value.
pub fn get_ref(&self) -> &T {
&self.value
}
/// Returns a mutable reference to the contained value.
pub fn get_mut(&mut self) -> &mut T {
&mut self.value
}
}
impl Borrow<str> for Spanned<String> {
fn borrow(&self) -> &str {
&self.get_ref()
}
}
impl<T: PartialEq> PartialEq for Spanned<T> {
fn eq(&self, other: &Self) -> bool {
self.value.eq(&other.value)
}
}
impl<T: Eq> Eq for Spanned<T> {}
impl<T: Hash> Hash for Spanned<T> {
fn hash<H: Hasher>(&self, state: &mut H) {
self.value.hash(state);
}
}
impl<T: PartialOrd> PartialOrd for Spanned<T> {
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
self.value.partial_cmp(&other.value)
}
}
impl<T: Ord> Ord for Spanned<T> {
fn cmp(&self, other: &Self) -> Ordering {
self.value.cmp(&other.value)
}
}
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 MILF 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, end, value })
}
}
let visitor = SpannedVisitor(::std::marker::PhantomData);
static FIELDS: [&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)
}
}
|
