1 files changed, 78 insertions, 0 deletions
diff --git a/vendor/unic-langid-impl/src/subtags/variant.rs b/vendor/unic-langid-impl/src/subtags/variant.rs
new file mode 100644
index 000000000..064ff3bb9
--- /dev/null
+++ b/vendor/unic-langid-impl/src/subtags/variant.rs
@@ -0,0 +1,78 @@
+use crate::parser::errors::ParserError;
+use std::str::FromStr;
+use tinystr::TinyStr8;
+
+#[derive(Debug, PartialEq, Eq, Clone, Hash, PartialOrd, Ord, Copy)]
+pub struct Variant(TinyStr8);
+
+impl Variant {
+    pub fn from_bytes(v: &[u8]) -> Result<Self, ParserError> {
+        let slen = v.len();
+
+        if slen < 4 || slen > 8 {
+            return Err(ParserError::InvalidSubtag);
+        }
+
+        let s = TinyStr8::from_bytes(v).map_err(|_| ParserError::InvalidSubtag)?;
+
+        if (slen >= 5 && !s.is_ascii_alphanumeric())
+            || (slen == 4
+                && !v[0].is_ascii_digit()
+                && v[1..].iter().any(|c: &u8| !c.is_ascii_alphanumeric()))
+        {
+            return Err(ParserError::InvalidSubtag);
+        }
+
+        Ok(Self(s.to_ascii_lowercase()))
+    }
+
+    pub fn as_str(&self) -> &str {
+        self.0.as_str()
+    }
+
+    /// # Safety
+    ///
+    /// This function accepts any u64 that is exected to be a valid
+    /// `TinyStr8` and a valid `Variant` subtag.
+    pub const unsafe fn from_raw_unchecked(v: u64) -> Self {
+        Self(TinyStr8::new_unchecked(v))
+    }
+}
+
+impl From<Variant> for u64 {
+    fn from(input: Variant) -> Self {
+        input.0.into()
+    }
+}
+
+impl From<&Variant> for u64 {
+    fn from(input: &Variant) -> Self {
+        input.0.into()
+    }
+}
+
+impl FromStr for Variant {
+    type Err = ParserError;
+
+    fn from_str(source: &str) -> Result<Self, Self::Err> {
+        Self::from_bytes(source.as_bytes())
+    }
+}
+
+impl std::fmt::Display for Variant {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        f.write_str(&self.0)
+    }
+}
+
+impl PartialEq<&str> for Variant {
+    fn eq(&self, other: &&str) -> bool {
+        self.as_str() == *other
+    }
+}
+
+impl PartialEq<str> for Variant {
+    fn eq(&self, other: &str) -> bool {
+        self.as_str() == other
+    }
+}