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use serde::de::{Deserializer, Deserialize, Error as SerdeError};
use self::super::super::util::BCP_47;
use self::super::super::Error;
use std::str::FromStr;
use std::ops::Deref;
use std::fmt;
#[derive(Debug, Clone, Hash, PartialEq, Eq, PartialOrd, Ord)]
pub struct LanguageTag(String);
impl FromStr for LanguageTag {
type Err = Error;
fn from_str(s: &str) -> Result<Self, Self::Err> {
if BCP_47.is_match(s) {
Ok(LanguageTag(s.to_string()))
} else {
Err(Error::Parse {
tp: "BCP-47 language tag",
wher: "language specifier".into(),
more: format!("\"{}\" invalid", s).into(),
})
}
}
}
impl<'de> Deserialize<'de> for LanguageTag {
fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
LanguageTag::from_str(<&'de str>::deserialize(deserializer)?).map_err(|e| {
let buf = e.to_string();
D::Error::custom(&buf[..buf.len() - 1])
})
}
}
impl fmt::Display for LanguageTag {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
self.0.fmt(f)
}
}
impl Deref for LanguageTag {
type Target = str;
fn deref(&self) -> &Self::Target {
&self.0
}
}