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use std::ops::Deref;
use syn::{Ident, NestedMeta, Meta};
use {FromMetaItem, Result, Error};
#[derive(Debug, Default, Clone, PartialEq, Eq)]
pub struct IdentList(Vec<Ident>);
impl IdentList {
pub fn new<T: Into<Ident>>(vals: Vec<T>) -> Self {
IdentList(vals.into_iter().map(T::into).collect())
}
pub fn as_strs<'a>(&'a self) -> Vec<&'a str> {
self.iter().map(|i| i.as_ref()).collect()
}
}
impl Deref for IdentList {
type Target = Vec<Ident>;
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl From<Vec<Ident>> for IdentList {
fn from(v: Vec<Ident>) -> Self {
IdentList(v)
}
}
impl FromMetaItem for IdentList {
fn from_list(v: &[NestedMeta]) -> Result<Self> {
let mut idents = Vec::with_capacity(v.len());
for nmi in v {
if let NestedMeta::Meta(Meta::Word(ref ident)) = *nmi {
idents.push(ident.clone());
} else {
return Err(Error::unexpected_type("non-word"))
}
}
Ok(IdentList(idents))
}
}