litl-val 0.2.0

A memory efficient representation of JSON values
Documentation 
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use std::fmt::Debug;

use thiserror::Error;

pub struct TinyString([u8; 6]);

impl TinyString {
    pub fn to_bytes(self) -> [u8; 6] {
        self.0
    }

    pub unsafe fn from_bytes_unchecked(bytes: [u8; 6]) -> Self {
        Self(bytes)
    }
}

impl<'a> TryFrom<&'a str> for TinyString {
    type Error = TinyStringError;

    fn try_from(s: &'a str) -> Result<Self, Self::Error> {
        if s.len() > 6 {
            return Err(TinyStringError::TooLong);
        }
        if s.contains('\0') {
            return Err(TinyStringError::ContainsNul);
        }
        let mut bytes = [0; 6];
        bytes[..s.len()].copy_from_slice(s.as_bytes());
        Ok(TinyString(bytes))
    }
}

#[derive(Error, Debug)]
pub enum TinyStringError {
    #[error("String is too long for TinyString")]
    TooLong,
    #[error("String contains a NUL byte")]
    ContainsNul,
}

impl AsRef<str> for TinyString {
    fn as_ref(&self) -> &str {
        let len = self.0.iter().position(|&b| b == 0).unwrap_or(6);
        unsafe { std::str::from_utf8_unchecked(&self.0[..len]) }
    }
}

impl Debug for TinyString {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        self.as_ref().fmt(f)
    }
}

impl PartialEq for TinyString {
    fn eq(&self, other: &Self) -> bool {
        self.as_ref() == other.as_ref()
    }
}

impl Eq for TinyString {}