esexpr 0.2.5

ESExpr serialization format and related utilities.
Documentation 
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//! Defines a copy-on-write type specific to str.

use alloc::borrow::{Cow, ToOwned};
use alloc::string::String;
use core::cmp::Ordering;
use core::fmt::Formatter;
use core::hash::Hasher;
use core::ops::Deref;

/// A copy-on-write type for str.
/// This includes a case for static strings.
#[derive(Clone)]
pub enum CowStr<'a> {
	/// A borrowed str
	Borrowed(&'a str),

	/// A static str
	Static(&'static str),

	/// An owned string
	Owned(String),
}

impl<'a> CowStr<'a> {
	/// Gets a borrowed `CowStr`.
	#[must_use]
	pub fn as_borrowed<'b>(&'b self) -> CowStr<'b>
	where
		'a: 'b,
	{
		match self {
			CowStr::Borrowed(s) => CowStr::Borrowed(s),
			CowStr::Static(s) => CowStr::Static(s),
			CowStr::Owned(s) => CowStr::Borrowed(s),
		}
	}

	/// Converts to a `CowStr` that does not borrow data.
	#[must_use]
	pub fn into_owned_cowstr(self) -> CowStr<'static> {
		match self {
			CowStr::Borrowed(s) => CowStr::Owned(s.to_owned()),
			CowStr::Static(s) => CowStr::Static(s),
			CowStr::Owned(s) => CowStr::Owned(s),
		}
	}

	/// Copies to a `CowStr` that does not borrow data.
	#[must_use]
	pub fn as_owned_cowstr(&self) -> CowStr<'static> {
		match self {
			CowStr::Borrowed(s) => CowStr::Owned((*s).to_owned()),
			CowStr::Static(s) => CowStr::Static(s),
			CowStr::Owned(s) => CowStr::Owned(s.clone()),
		}
	}

	/// Convert into a `String`.
	#[must_use]
	pub fn into_string(self) -> String {
		match self {
			CowStr::Borrowed(s) | CowStr::Static(s) => s.to_owned(),
			CowStr::Owned(s) => s,
		}
	}
}

impl<'a> core::fmt::Debug for CowStr<'a> {
	fn fmt(&self, f: &mut Formatter<'_>) -> core::fmt::Result {
		self.deref().fmt(f)
	}
}

impl<'a> Deref for CowStr<'a> {
	type Target = str;

	fn deref(&self) -> &Self::Target {
		match self {
			CowStr::Borrowed(s) | CowStr::Static(s) => s,
			CowStr::Owned(s) => s.as_str(),
		}
	}
}

impl From<&'static str> for CowStr<'static> {
	fn from(value: &'static str) -> Self {
		CowStr::Static(value)
	}
}

impl From<String> for CowStr<'static> {
	fn from(value: String) -> Self {
		CowStr::Owned(value)
	}
}

impl<'a> From<Cow<'a, str>> for CowStr<'a> {
	fn from(value: Cow<'a, str>) -> Self {
		match value {
			Cow::Borrowed(s) => CowStr::Borrowed(s),
			Cow::Owned(s) => CowStr::Owned(s),
		}
	}
}

impl<'a> From<CowStr<'a>> for Cow<'a, str> {
	fn from(value: CowStr<'a>) -> Self {
		match value {
			CowStr::Borrowed(s) | CowStr::Static(s) => Cow::Borrowed(s),
			CowStr::Owned(s) => Cow::Owned(s),
		}
	}
}

impl<'a, 'b> PartialEq<CowStr<'b>> for CowStr<'a> {
	fn eq(&self, other: &CowStr<'b>) -> bool {
		str::eq(&**self, &**other)
	}
}

impl<'a> PartialEq<str> for CowStr<'a> {
	fn eq(&self, other: &str) -> bool {
		str::eq(&**self, other)
	}
}

impl<'a, 'b> PartialEq<&'b str> for CowStr<'a> {
	fn eq(&self, other: &&'b str) -> bool {
		str::eq(&**self, *other)
	}
}

impl<'a> PartialEq<CowStr<'a>> for str {
	fn eq(&self, other: &CowStr<'a>) -> bool {
		str::eq(self, &**other)
	}
}

impl<'a> PartialEq<CowStr<'a>> for &str {
	fn eq(&self, other: &CowStr<'a>) -> bool {
		str::eq(self, &**other)
	}
}

impl<'a> Eq for CowStr<'a> {}

impl<'a, 'b> PartialOrd<CowStr<'b>> for CowStr<'a> {
	fn partial_cmp(&self, other: &CowStr<'b>) -> Option<Ordering> {
		str::partial_cmp(&**self, &**other)
	}
}

impl<'a> Ord for CowStr<'a> {
	fn cmp(&self, other: &Self) -> Ordering {
		str::cmp(&**self, &**other)
	}
}

impl<'a> core::hash::Hash for CowStr<'a> {
	fn hash<H: Hasher>(&self, state: &mut H) {
		self.deref().hash(state);
	}
}

impl<'a> core::fmt::Display for CowStr<'a> {
	fn fmt(&self, f: &mut Formatter<'_>) -> core::fmt::Result {
		self.deref().fmt(f)
	}
}

impl<'a> core::borrow::Borrow<str> for CowStr<'a> {
	fn borrow(&self) -> &str {
		self
	}
}

impl<'a> core::borrow::Borrow<str> for &CowStr<'a> {
	fn borrow(&self) -> &str {
		self
	}
}