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use std::fmt;
use std::rc::Rc;
use super::pair::{self, Pair};
use super::queueable_token::QueueableToken;
use super::token_iterator::{self, TokenIterator};
use super::super::inputs::Input;
use super::super::RuleType;
pub struct FlatPairs<R, I: Input> {
queue: Rc<Vec<QueueableToken<R>>>,
input: Rc<I>,
start: usize,
end: usize
}
pub fn new<R: RuleType, I: Input>(
queue: Rc<Vec<QueueableToken<R>>>,
input: Rc<I>,
start: usize,
end: usize
) -> FlatPairs<R, I> {
FlatPairs {
queue,
input,
start,
end
}
}
impl<R: RuleType, I: Input> FlatPairs<R, I> {
#[inline]
pub fn into_iter(self) -> TokenIterator<R, I> {
token_iterator::new(
self.queue,
self.input,
self.start,
self.end
)
}
fn next_start(&mut self) {
self.start += 1;
while self.start < self.end && !self.is_start() {
self.start += 1;
}
}
fn is_start(&self) -> bool {
match self.queue[self.start] {
QueueableToken::Start { .. } => true,
QueueableToken::End { .. } => false
}
}
}
impl<R: RuleType, I: Input> Iterator for FlatPairs<R, I> {
type Item = Pair<R, I>;
fn next(&mut self) -> Option<Self::Item> {
if self.start >= self.end {
return None;
}
let pair = pair::new(
self.queue.clone(),
self.input.clone(),
self.start
);
self.next_start();
Some(pair)
}
}
impl<R: RuleType, I: Input> fmt::Debug for FlatPairs<R, I> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "FlatPairs {{ pairs: {:?} }}", self.clone().collect::<Vec<_>>())
}
}
impl<R: Clone, I: Input> Clone for FlatPairs<R, I> {
fn clone(&self) -> FlatPairs<R, I> {
FlatPairs {
queue: self.queue.clone(),
input: self.input.clone(),
start: self.start,
end: self.end
}
}
}