regast-syntax 0.1.0

Lossless syntax tree for the regast regular expression engine
Documentation 
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use crate::{NodeId, Pattern};

#[derive(Clone, Debug)]
pub struct NodeMap<T> {
    data: Vec<Option<T>>,
}

impl<T> NodeMap<T> {
    #[must_use]
    pub fn new(pattern: &Pattern) -> Self {
        Self {
            data: std::iter::repeat_with(|| None)
                .take(pattern.len())
                .collect(),
        }
    }

    pub fn insert(&mut self, id: NodeId, value: T) -> Option<T> {
        self.data[id.0 as usize].replace(value)
    }

    #[must_use]
    pub fn get(&self, id: NodeId) -> Option<&T> {
        self.data.get(id.0 as usize)?.as_ref()
    }

    #[must_use]
    pub fn get_mut(&mut self, id: NodeId) -> Option<&mut T> {
        self.data.get_mut(id.0 as usize)?.as_mut()
    }
}