40 lines
1.1 KiB
Rust
40 lines
1.1 KiB
Rust
use crate::eval::Value;
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use crate::geom::Dir;
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/// A natural language.
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#[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
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pub struct Lang([u8; 2]);
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impl Lang {
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/// The code for the english language.
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pub const ENGLISH: Self = Self(*b"en");
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/// Construct a language from a two-byte ISO 639-1 code.
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pub fn from_str(iso: &str) -> Option<Self> {
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let mut bytes: [u8; 2] = iso.as_bytes().try_into().ok()?;
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bytes.make_ascii_lowercase();
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Some(Self(bytes))
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}
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/// Return the language code as a string slice.
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pub fn as_str(&self) -> &str {
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std::str::from_utf8(&self.0).unwrap_or_default()
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}
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/// The default direction for the language.
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pub fn dir(&self) -> Dir {
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match self.as_str() {
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"ar" | "dv" | "fa" | "he" | "ks" | "pa" | "ps" | "sd" | "ug" | "ur"
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| "yi" => Dir::RTL,
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_ => Dir::LTR,
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}
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}
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}
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castable! {
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Lang,
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Expected: "string",
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Value::Str(string) => Self::from_str(&string)
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.ok_or("expected two letter language code")?,
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}
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