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use serde_derive::{Deserialize, Serialize};
use std::collections::HashMap;
#[derive(Deserialize, Serialize)]
pub struct Relation<T> {
pub(crate) facts: Vec<T>,
}
impl<T> Default for Relation<T> {
fn default() -> Self {
Self { facts: Vec::new() }
}
}
impl<T> Relation<T> {
pub fn insert(&mut self, fact: T) {
self.facts.push(fact);
}
pub fn iter<'a>(&'a self) -> impl Iterator<Item = &'a T> {
self.facts.iter()
}
pub fn into_iter(self) -> impl Iterator<Item = T> {
self.facts.into_iter()
}
pub fn len(&self) -> usize {
self.facts.len()
}
}
impl<T> Into<Vec<T>> for Relation<T> {
fn into(self) -> Vec<T> {
self.facts
}
}
impl<T> From<Vec<T>> for Relation<T> {
fn from(facts: Vec<T>) -> Self {
Self { facts: facts }
}
}
pub trait InterningTableKey: Copy + Eq + std::hash::Hash + From<usize> + Into<usize> {}
impl<T> InterningTableKey for T where T: Copy + Eq + std::hash::Hash + From<usize> + Into<usize> {}
pub trait InterningTableValue: Eq + std::hash::Hash + Clone {}
impl<T> InterningTableValue for T where T: Eq + std::hash::Hash + Clone {}
#[derive(Deserialize, Serialize)]
#[serde(from = "Vec<V>")]
pub struct InterningTable<K, V>
where
K: InterningTableKey,
V: InterningTableValue,
{
pub(crate) contents: Vec<V>,
#[serde(skip_serializing)]
inv_contents: HashMap<V, K>,
}
impl<K, V> Default for InterningTable<K, V>
where
K: InterningTableKey,
V: InterningTableValue,
{
fn default() -> Self {
Self {
contents: Vec::new(),
inv_contents: HashMap::new(),
}
}
}
impl<K, V> From<Vec<V>> for InterningTable<K, V>
where
K: InterningTableKey,
V: InterningTableValue,
{
fn from(contents: Vec<V>) -> Self {
let inv_contents = contents
.iter()
.enumerate()
.map(|(k, v)| (v.clone(), k.into()))
.collect();
Self {
contents,
inv_contents,
}
}
}
impl<K, V> InterningTable<K, V>
where
K: InterningTableKey,
V: InterningTableValue,
{
pub(crate) fn intern(&mut self, value: V) -> K {
if self.inv_contents.contains_key(&value) {
self.inv_contents[&value]
} else {
let new_key = self.contents.len().into();
self.inv_contents.insert(value.clone(), new_key);
self.contents.push(value);
new_key
}
}
pub fn iter_values(&self) -> impl Iterator<Item = &V> {
self.contents.iter()
}
pub fn into_iter(self) -> impl Iterator<Item = (K, V)> {
self.contents
.into_iter()
.enumerate()
.map(|(k, v)| (k.into(), v))
}
pub fn len(&self) -> usize {
self.contents.len()
}
}
impl<K> InterningTable<K, String>
where
K: InterningTableKey,
{
pub fn lookup_str(&self, value: &str) -> Option<K> {
self.inv_contents.get(value).cloned()
}
}
impl<K, V> InterningTable<K, V>
where
K: InterningTableKey,
V: InterningTableValue,
{
pub fn lookup(&self, value: &V) -> Option<K> {
self.inv_contents.get(value).cloned()
}
}
impl<K, V> std::ops::Index<K> for InterningTable<K, V>
where
K: InterningTableKey,
V: InterningTableValue,
{
type Output = V;
fn index(&self, key: K) -> &Self::Output {
let index: usize = key.into();
&self.contents[index]
}
}
impl<K, V> Into<Vec<(K, V)>> for InterningTable<K, V>
where
K: InterningTableKey,
V: InterningTableValue,
{
fn into(self) -> Vec<(K, V)> {
self.contents
.into_iter()
.enumerate()
.map(|(i, v)| (i.into(), v))
.collect()
}
}