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#[derive(Debug, Eq, PartialEq, Clone, Default)]
pub struct Assist<T> {
valid: usize,
pending: usize,
pending_special: usize,
next_options: NextOptions<T>,
}
#[derive(Debug, Eq, PartialEq, Clone)]
pub enum NextOptions<T> {
NoOptions,
Avail(usize, Vec<T>),
}
impl<T> Default for NextOptions<T> {
fn default() -> Self {
NextOptions::NoOptions
}
}
impl<T> NextOptions<T> {
pub fn into_position(self, valid: usize) -> (usize, Vec<T>) {
match self {
NextOptions::NoOptions => (0, vec![]),
NextOptions::Avail(pos, v) => (valid + pos, v),
}
}
}
impl<T> Assist<T> {
pub fn pend(&mut self, count: usize) {
self.pending += count;
}
pub fn pend_one(&mut self) {
self.pend(1);
}
pub fn pending(&self) -> usize {
self.pending
}
pub fn has_pending(&self) -> bool {
self.pending > 0
}
pub fn commit_pending(&mut self) {
self.valid += self.pending;
self.pending = 0;
self.pending_special = 0;
}
pub fn next_options(mut self, next_options: NextOptions<T>) -> Self {
self.next_options = next_options;
self
}
pub fn set_next_options(&mut self, next_options: NextOptions<T>) {
self.next_options = next_options;
}
pub fn set_pending_special(&mut self, pending_special: usize) {
self.pending_special = pending_special
}
pub fn with_valid(mut self, valid: usize) -> Self {
self.valid += valid;
self
}
pub fn dismantle(self) -> (usize, usize, usize, NextOptions<T>) {
let Self {
valid,
pending,
pending_special,
next_options,
} = self;
(valid, pending, pending_special, next_options)
}
}