romulus 0.3.0

a stream editor like sed
Documentation 
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use super::Scope;

#[derive(Debug)]
pub(crate) struct RangeScopeTracker {
    states: Vec<Option<Scope>>,
    pos: usize,
}

impl RangeScopeTracker {
    pub(crate) fn new(cap: usize) -> RangeScopeTracker {
        RangeScopeTracker {
            states: vec![None; cap],
            pos: 0,
        }
    }

    pub(crate) fn in_range(&self) -> bool {
        self.states[self.pos].is_some()
    }

    pub(crate) fn next(&mut self) {
        self.skip(1)
    }

    pub(crate) fn skip(&mut self, amount: usize) {
        if !self.states.is_empty() {
            self.pos = (self.pos + amount) % self.states.len();
        }
    }

    pub(crate) fn get(&self) -> &Option<Scope> {
        &self.states[self.pos]
    }

    pub(crate) fn set(&mut self, scope: Scope) {
        self.states[self.pos] = Some(scope);
    }

    pub(crate) fn clear(&mut self) {
        self.states[self.pos] = None
    }
}