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use crate::parser::errors::ParserError;
use std::str::FromStr;
use tinystr::TinyStr4;
#[derive(Debug, PartialEq, Eq, Clone, Hash, PartialOrd, Ord, Copy)]
pub struct Region(TinyStr4);
impl Region {
pub fn from_bytes(v: &[u8]) -> Result<Self, ParserError> {
let slen = v.len();
match slen {
2 => {
let s = TinyStr4::from_bytes(v).map_err(|_| ParserError::InvalidSubtag)?;
if !s.is_ascii_alphabetic() {
return Err(ParserError::InvalidSubtag);
}
Ok(Self(s.to_ascii_uppercase()))
}
3 => {
let s = TinyStr4::from_bytes(v).map_err(|_| ParserError::InvalidSubtag)?;
if !s.is_ascii_numeric() {
return Err(ParserError::InvalidSubtag);
}
Ok(Self(s))
}
_ => Err(ParserError::InvalidSubtag),
}
}
pub fn as_str(&self) -> &str {
self.0.as_str()
}
/// # Safety
///
/// This function accepts any u64 that is exected to be a valid
/// `TinyStr4` and a valid `Region` subtag.
pub const unsafe fn from_raw_unchecked(v: u32) -> Self {
Self(TinyStr4::from_bytes_unchecked(v.to_le_bytes()))
}
}
impl From<Region> for u32 {
fn from(input: Region) -> Self {
u32::from_le_bytes(*input.0.all_bytes())
}
}
impl<'l> From<&'l Region> for &'l str {
fn from(input: &'l Region) -> Self {
input.0.as_str()
}
}
impl FromStr for Region {
type Err = ParserError;
fn from_str(source: &str) -> Result<Self, Self::Err> {
Self::from_bytes(source.as_bytes())
}
}
impl std::fmt::Display for Region {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
f.write_str(&self.0)
}
}
impl PartialEq<&str> for Region {
fn eq(&self, other: &&str) -> bool {
self.as_str() == *other
}
}