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use std::borrow::Borrow;
use std::cmp;
use std::fmt;
use std::hash;
pub trait ToKey {
fn to_key(&self) -> Key;
}
impl<'a, T> ToKey for &'a T
where
T: ToKey + ?Sized,
{
fn to_key(&self) -> Key {
(**self).to_key()
}
}
impl<'k> ToKey for Key<'k> {
fn to_key(&self) -> Key {
Key { key: self.key }
}
}
impl ToKey for str {
fn to_key(&self) -> Key {
Key::from_str(self)
}
}
#[derive(Clone)]
pub struct Key<'k> {
key: &'k str,
}
impl<'k> Key<'k> {
pub fn from_str(key: &'k str) -> Self {
Key { key: key }
}
pub fn as_str(&self) -> &str {
self.key
}
}
impl<'k> fmt::Debug for Key<'k> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
self.key.fmt(f)
}
}
impl<'k> fmt::Display for Key<'k> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
self.key.fmt(f)
}
}
impl<'k> hash::Hash for Key<'k> {
fn hash<H>(&self, state: &mut H)
where
H: hash::Hasher,
{
self.as_str().hash(state)
}
}
impl<'k, 'ko> PartialEq<Key<'ko>> for Key<'k> {
fn eq(&self, other: &Key<'ko>) -> bool {
self.as_str().eq(other.as_str())
}
}
impl<'k> Eq for Key<'k> {}
impl<'k, 'ko> PartialOrd<Key<'ko>> for Key<'k> {
fn partial_cmp(&self, other: &Key<'ko>) -> Option<cmp::Ordering> {
self.as_str().partial_cmp(other.as_str())
}
}
impl<'k> Ord for Key<'k> {
fn cmp(&self, other: &Self) -> cmp::Ordering {
self.as_str().cmp(other.as_str())
}
}
impl<'k> AsRef<str> for Key<'k> {
fn as_ref(&self) -> &str {
self.as_str()
}
}
impl<'k> Borrow<str> for Key<'k> {
fn borrow(&self) -> &str {
self.as_str()
}
}
impl<'k> From<&'k str> for Key<'k> {
fn from(s: &'k str) -> Self {
Key::from_str(s)
}
}
#[cfg(feature = "std")]
mod std_support {
use super::*;
use std::borrow::Cow;
impl ToKey for String {
fn to_key(&self) -> Key {
Key::from_str(self)
}
}
impl<'a> ToKey for Cow<'a, str> {
fn to_key(&self) -> Key {
Key::from_str(self)
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn key_from_string() {
assert_eq!("a key", Key::from_str("a key").as_str());
}
}