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use crate::collections::HashMap;
use crate::{Component, ComponentRef, IntoComponent};
use std::mem;
/// A tree of names.
#[derive(Debug, Clone)]
pub struct Names {
root: Node,
}
impl Default for Names {
fn default() -> Self {
Names {
root: Default::default(),
}
}
}
impl Names {
/// Construct a collection of names.
pub fn new() -> Self {
Self::default()
}
/// Insert the given item as an import.
///
/// # Examples
///
/// ```rust
/// use runestick::Names;
///
/// let mut names = Names::new();
/// assert!(!names.contains(&["test"]));
/// assert!(!names.insert(&["test"]));
/// assert!(names.contains(&["test"]));
/// assert!(names.insert(&["test"]));
/// ```
pub fn insert<I>(&mut self, iter: I) -> bool
where
I: IntoIterator,
I::Item: IntoComponent,
{
let mut current = &mut self.root;
for c in iter {
current = current.children.entry(c.into_component()).or_default();
}
mem::replace(&mut current.term, true)
}
/// Test if the given import exists.
///
/// # Examples
///
/// ```rust
/// use runestick::Names;
///
/// let mut names = Names::new();
/// assert!(!names.contains(&["test"]));
/// assert!(!names.insert(&["test"]));
/// assert!(names.contains(&["test"]));
/// assert!(names.insert(&["test"]));
/// ```
pub fn contains<I>(&self, iter: I) -> bool
where
I: IntoIterator,
I::Item: IntoComponent,
{
self.find_node(iter).map(|n| n.term).unwrap_or_default()
}
/// Test if we contain the given prefix.
pub fn contains_prefix<I>(&self, iter: I) -> bool
where
I: IntoIterator,
I::Item: IntoComponent,
{
self.find_node(iter).is_some()
}
/// Iterate over all known components immediately under the specified `iter`
/// path.
pub fn iter_components<'a, I: 'a>(
&'a self,
iter: I,
) -> impl Iterator<Item = ComponentRef<'a>> + 'a
where
I: IntoIterator,
I::Item: IntoComponent,
{
let mut current = &self.root;
for c in iter {
let c = c.into_component();
current = match current.children.get(&c) {
Some(node) => node,
None => return IterComponents(None),
};
}
return IterComponents(Some(current.children.keys()));
struct IterComponents<I>(Option<I>);
impl<'a, I> Iterator for IterComponents<I>
where
I: Iterator<Item = &'a Component>,
{
type Item = ComponentRef<'a>;
fn next(&mut self) -> Option<Self::Item> {
let mut iter = self.0.take()?;
let next = iter.next()?;
self.0 = Some(iter);
Some(next.as_component_ref())
}
}
}
/// Find the node corresponding to the given path.
fn find_node<I>(&self, iter: I) -> Option<&Node>
where
I: IntoIterator,
I::Item: IntoComponent,
{
let mut current = &self.root;
for c in iter {
let c = c.as_component_ref().into_component();
current = current.children.get(&c)?;
}
Some(current)
}
}
#[derive(Default, Debug, Clone)]
struct Node {
/// If the node is terminating.
term: bool,
/// The children of this node.
children: HashMap<Component, Node>,
}