conststr 0.5.0

Constant strings.
Documentation 
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// Copyright 2025 Gabriel Bjørnager Jensen.

use core::convert::Infallible;
use core::error::Error;
use core::fmt::{self, Display, Formatter};

#[cfg(feature = "oct")]
use oct::error::GenericDecodeError;

/// An invalid UTF-8 sequence was encountered.
#[derive(Debug, Eq, PartialEq)]
#[must_use]
pub struct Utf8Error {
	/// The invalid UTF-8 octet.
	pub value: u8,

	/// The index of the invalid octet.
	pub index: usize,
}

impl Display for Utf8Error {
	#[inline]
	fn fmt(&self, f: &mut Formatter) -> fmt::Result {
		write!(f, "found invalid utf-8 octet {:#02X} at offset ({})", self.value, self.index)
	}
}

impl Error for Utf8Error { }

impl From<Infallible> for Utf8Error {
	#[inline(always)]
	fn from(_value: Infallible) -> Self {
		unreachable!()
	}
}

#[cfg(feature = "oct")]
impl From<Utf8Error> for GenericDecodeError {
	#[inline(always)]
	fn from(value: Utf8Error) -> Self {
		let e = oct::error::Utf8Error {
			value: value.value,
			index: value.index,
		};

		Self::BadString(e)
	}
}