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use alloc::fmt::{Debug, Display, Formatter, Result as FmtResult};
use core::ops::{Deref, DerefMut};
use core::str;
use crate::{BoxHeader, Header, OwnedSlice, TooLong};
#[derive(Clone, Default)]
pub struct Str<H: Header = BoxHeader>(OwnedSlice<u8, H>);
impl<H> Str<H>
where
H: Header,
{
#[inline]
pub fn new(s: &str) -> Result<Self, TooLong> {
OwnedSlice::new(s.as_bytes()).map(Self)
}
}
impl<H> Debug for Str<H>
where
H: Header,
{
#[inline]
fn fmt(&self, fmt: &mut Formatter) -> FmtResult {
write!(fmt, "{:?}", self.deref())
}
}
impl<H> Display for Str<H>
where
H: Header,
{
#[inline]
fn fmt(&self, fmt: &mut Formatter) -> FmtResult {
write!(fmt, "{}", self.deref())
}
}
impl<H> Deref for Str<H>
where
H: Header,
{
type Target = str;
#[inline]
fn deref(&self) -> &str {
unsafe { str::from_utf8_unchecked(&self.0) }
}
}
impl DerefMut for Str<BoxHeader> {
#[inline]
fn deref_mut(&mut self) -> &mut Self::Target {
unsafe { str::from_utf8_unchecked_mut(&mut self.0) }
}
}
#[cfg(all(feature = "std", test))]
mod tests {
use super::*;
#[test]
fn strings() {
let s: Str = Str::new("Hello").unwrap();
assert_eq!("Hello", s.deref());
assert_eq!("Hello", s.to_string());
assert_eq!("\"Hello\"", format!("{:?}", s));
}
}