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use errors::Result;
use {Loc, OptionEntry, RpNumber, WithSpan};
pub trait Options {
type Item: OptionEntry;
fn items(&self) -> &Vec<Loc<Self::Item>>;
fn lookup(&self, name: &str) -> Vec<Loc<&Self::Item>> {
self.items()
.iter()
.filter(move |o| o.name() == name)
.map(|option| Loc::as_ref(&option))
.collect()
}
fn find_all_strings(&self, name: &str) -> Result<Vec<Loc<String>>> {
let mut out = Vec::new();
for s in self.lookup(name) {
let (value, span) = Loc::take_pair(s);
let string = value.as_string().with_span(&span)?;
out.push(Loc::new(string, span));
}
Ok(out)
}
fn find_all_u32(&self, name: &str) -> Result<Vec<Loc<RpNumber>>> {
let mut out = Vec::new();
for s in self.lookup(name) {
let (value, span) = Loc::take_pair(s);
let number = value.as_number().with_span(&span)?;
out.push(Loc::new(number, span));
}
Ok(out)
}
fn find_all_identifiers(&self, name: &str) -> Result<Vec<Loc<String>>> {
let mut out = Vec::new();
for s in self.lookup(name) {
let (value, span) = Loc::take_pair(s);
let identifier = value.as_identifier().with_span(&span)?;
out.push(Loc::new(identifier, span));
}
Ok(out)
}
fn find_one_identifier(&self, name: &str) -> Result<Option<Loc<String>>> {
Ok(self.find_all_identifiers(name)?.into_iter().next())
}
fn find_one_string(&self, name: &str) -> Result<Option<Loc<String>>> {
Ok(self.find_all_strings(name)?.into_iter().next())
}
fn find_one_u32(&self, name: &str) -> Result<Option<Loc<RpNumber>>> {
Ok(self.find_all_u32(name)?.into_iter().next())
}
}
impl<T> Options for Vec<Loc<T>>
where
T: OptionEntry,
{
type Item = T;
fn items(&self) -> &Vec<Loc<Self::Item>> {
self
}
}