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use crate::eval::Value;
use crate::geom::Dir;
/// A code for a natural language.
#[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
pub struct Lang([u8; 3], u8);
impl Lang {
/// The code for the english language.
pub const ENGLISH: Self = Self(*b"en ", 2);
/// Construct a language from a two- or three-byte ISO 639-1/2/3 code.
pub fn from_str(iso: &str) -> Option<Self> {
let len = iso.len();
if matches!(len, 2 ..= 3) && iso.is_ascii() {
let mut bytes = [b' '; 3];
bytes[.. len].copy_from_slice(iso.as_bytes());
bytes.make_ascii_lowercase();
Some(Self(bytes, len as u8))
} else {
None
}
}
/// Return the language code as an all lowercase string slice.
pub fn as_str(&self) -> &str {
std::str::from_utf8(&self.0[.. usize::from(self.1)]).unwrap_or_default()
}
/// The default direction for the language.
pub fn dir(&self) -> Dir {
match self.as_str() {
"ar" | "dv" | "fa" | "he" | "ks" | "pa" | "ps" | "sd" | "ug" | "ur"
| "yi" => Dir::RTL,
_ => Dir::LTR,
}
}
}
castable! {
Lang,
Expected: "string",
Value::Str(string) => Self::from_str(&string)
.ok_or("expected two or three letter language code (ISO 639-1/2/3)")?,
}
/// A code for a region somewhere in the world.
#[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
pub struct Region([u8; 2]);
impl Region {
/// Construct a region from its two-byte ISO 3166-1 alpha-2 code.
pub fn from_str(iso: &str) -> Option<Self> {
if iso.is_ascii() {
let mut bytes: [u8; 2] = iso.as_bytes().try_into().ok()?;
bytes.make_ascii_uppercase();
Some(Self(bytes))
} else {
None
}
}
/// Return the region code as an all uppercase string slice.
pub fn as_str(&self) -> &str {
std::str::from_utf8(&self.0).unwrap_or_default()
}
}
castable! {
Region,
Expected: "string",
Value::Str(string) => Self::from_str(&string)
.ok_or("expected two letter region code (ISO 3166-1 alpha-2)")?,
}
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