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use crate::feed::Feed;
use crate::consumer::Consumer;
use crate::feed::Result;
use std::ops::Range;
#[derive(Clone, PartialEq)]
pub struct Many<T : Feed> {
children : Vec<T>,
range: Range<usize>
}
impl <T : Feed + Default + Clone> Feed for Many<T> {
fn feed(&mut self, consumer: &mut Consumer) -> Result {
let to_clone_from = Self::from(self.range.clone());
let mut i = 0;
loop {
if i == self.range.end { break; }
let ref mut to_push = T::default();
let current_result = consumer.consume(to_push);
if current_result.is_ok() {
self.children.push(to_push.clone());
i += 1;
}
else { break; }
}
if self.range.contains(&i) {
self.clone_from(&to_clone_from);
Ok(())
}
else { Err(()) }
}
}
impl<T : Feed> IntoIterator for Many<T> {
type Item = T;
type IntoIter = std::vec::IntoIter<Self::Item>;
fn into_iter(self) -> Self::IntoIter {
self.children.into_iter()
}
}
impl<T : Feed> From<Range<usize>> for Many<T> {
fn from(range: Range<usize>) -> Self {
Self {
children: Vec::default(),
range
}
}
}