1 files changed, 108 insertions, 0 deletions
diff --git a/vendor/unic-langid-impl/src/subtags/language.rs b/vendor/unic-langid-impl/src/subtags/language.rs
new file mode 100644
index 000000000..3703475e2
--- /dev/null
+++ b/vendor/unic-langid-impl/src/subtags/language.rs
@@ -0,0 +1,108 @@
+use crate::parser::errors::ParserError;
+use std::borrow::Borrow;
+use std::convert::TryFrom;
+use std::str::FromStr;
+use tinystr::TinyStr8;
+
+#[derive(Default, Debug, PartialEq, Eq, Clone, Hash, PartialOrd, Ord, Copy)]
+pub struct Language(Option<TinyStr8>);
+
+impl Language {
+    pub fn from_bytes(v: &[u8]) -> Result<Self, ParserError> {
+        let slen = v.len();
+
+        let s = TinyStr8::from_bytes(v).map_err(|_| ParserError::InvalidLanguage)?;
+        if slen < 2 || slen > 8 || slen == 4 || !s.is_ascii_alphabetic() {
+            return Err(ParserError::InvalidLanguage);
+        }
+
+        let value = s.to_ascii_lowercase();
+
+        if value == "und" {
+            Ok(Self(None))
+        } else {
+            Ok(Self(Some(value)))
+        }
+    }
+
+    pub fn as_str(&self) -> &str {
+        self.0.as_deref().unwrap_or("und")
+    }
+
+    /// # Safety
+    ///
+    /// This function accepts any u64 that is exected to be a valid
+    /// `TinyStr8` and a valid `Language` subtag.
+    pub const unsafe fn from_raw_unchecked(v: u64) -> Self {
+        Self(Some(TinyStr8::new_unchecked(v)))
+    }
+
+    pub fn matches<O: Borrow<Self>>(
+        self,
+        other: O,
+        self_as_range: bool,
+        other_as_range: bool,
+    ) -> bool {
+        (self_as_range && self.0.is_none())
+            || (other_as_range && other.borrow().0.is_none())
+            || self == *other.borrow()
+    }
+
+    pub fn clear(&mut self) {
+        self.0 = None;
+    }
+
+    pub fn is_empty(self) -> bool {
+        self.0.is_none()
+    }
+}
+
+impl From<Language> for Option<u64> {
+    fn from(input: Language) -> Self {
+        input.0.map(|i| i.into())
+    }
+}
+
+impl From<&Language> for Option<u64> {
+    fn from(input: &Language) -> Self {
+        input.0.map(|i| i.into())
+    }
+}
+
+impl<T> TryFrom<Option<T>> for Language
+where
+    T: AsRef<[u8]>,
+{
+    type Error = ParserError;
+
+    fn try_from(v: Option<T>) -> Result<Self, Self::Error> {
+        match v {
+            Some(l) => Ok(Self::from_bytes(l.as_ref())?),
+            None => Ok(Self(None)),
+        }
+    }
+}
+
+impl FromStr for Language {
+    type Err = ParserError;
+
+    fn from_str(source: &str) -> Result<Self, Self::Err> {
+        Self::from_bytes(source.as_bytes())
+    }
+}
+
+impl std::fmt::Display for Language {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        if let Some(ref lang) = self.0 {
+            f.write_str(lang)
+        } else {
+            f.write_str("und")
+        }
+    }
+}
+
+impl PartialEq<&str> for Language {
+    fn eq(&self, other: &&str) -> bool {
+        self.as_str() == *other
+    }
+}