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use crate::prelude::*;
use std::hash::{Hash, DefaultHasher, Hasher};
#[derive(Clone)]
pub struct ValueMap {
values: Vec<ValueEntry>,
size: usize,
used: usize,
}
#[derive(Clone)]
enum ValueEntry {
Empty,
Taken((Value, Value)),
Gravestone(Value),
}
impl Default for ValueMap {
fn default() -> Self {
ValueMap {
values: vec![ValueEntry::Empty; 8],
size: 8,
used: 0,
}
}
}
impl ValueMap {
fn get_index(values: &Vec<ValueEntry>, size: usize, key: &Value, hash: usize) -> usize {
let mut nearest_grave = None;
let start = hash & size;
for offset in 0..size {
let idx = (start + offset) % size;
match &values[idx] {
ValueEntry::Empty => return idx,
ValueEntry::Taken((marker, _)) => {
if marker.eq(key) { return idx };
continue;
},
ValueEntry::Gravestone(grave) => {
if grave.eq(key) { return idx };
if nearest_grave.is_none() {
nearest_grave = Some(idx);
}
continue;
},
}
}
match nearest_grave {
Some(idx) => idx,
None => panic!("cannot get value map index: full!!!"),
}
}
fn expand(&mut self) -> Result<()> {
let pairs = self.values.iter()
.filter_map(|e| {
match e {
ValueEntry::Taken(s) => Some(s.clone()),
_ => None
}
})
.collect::<Vec<(Value, Value)>>();
let new_used = pairs.len();
let new_size = self.size * 2 + pairs.len();
let mut new_values = vec![ValueEntry::Empty; new_size];
for (key, value) in pairs.into_iter() {
let hash = self.hash(&key)?;
let idx = ValueMap::get_index(&new_values, new_size, &key, hash);
new_values[idx] = ValueEntry::Taken((key, value));
}
self.used = new_used;
self.size = new_size;
self.values = new_values;
Ok(())
}
fn hash(&self, key: &Value) -> Result<usize> {
let mut hasher = DefaultHasher::new();
key.try_hash(&mut hasher)?;
Ok(hasher.finish() as usize)
}
pub fn get<'a>(&'a self, key: &Value) -> Result<Option<&'a Value>> {
let hash = self.hash(key)?;
let idx = ValueMap::get_index(&self.values, self.size, key, hash);
match &self.values[idx] {
ValueEntry::Taken((_, value)) => Ok(Some(value)),
_ => Ok(None)
}
}
pub fn insert(&mut self, key: Value, value: Value) -> Result<()> {
if self.used * 3 >= self.size * 2 {
self.expand()?;
}
let key = key.deep_clone();
let hash = self.hash(&key)?;
let idx = ValueMap::get_index(&self.values, self.size, &key, hash);
self.values[idx] = ValueEntry::Taken((key, value));
self.used += 1;
Ok(())
}
pub fn remove(&mut self, key: &Value) -> Result<Option<Value>> {
let hash = self.hash(key)?;
let idx = ValueMap::get_index(&self.values, self.size, key, hash);
let mut value = ValueEntry::Gravestone(key.clone());
std::mem::swap(&mut value, &mut self.values[idx]);
match value {
ValueEntry::Taken((_, v)) => {
self.used -= 1;
Ok(Some(v))
}
_ => Ok(None),
}
}
pub fn entries<'a>(&'a self) -> ValueMapIterator<'a> {
ValueMapIterator::new(self)
}
pub fn new() -> Self {
Self::default()
}
pub fn len(&self) -> usize {
self.used
}
}
pub struct ValueMapIterator<'a> {
map: &'a ValueMap,
index: usize
}
impl<'a> ValueMapIterator<'a> {
fn new(map: &'a ValueMap) -> Self {
Self { map, index: 0 }
}
}
impl<'a> Iterator for ValueMapIterator<'a> {
type Item = (&'a Value, &'a Value);
fn next(&mut self) -> Option<Self::Item> {
let mut idx = self.index;
loop {
if idx >= self.map.size {
return None
}
use ValueEntry as E;
let E::Taken((k, v)) = &self.map.values[idx] else {
idx += 1;
continue;
};
self.index = idx + 1;
return Some((k, v))
}
}
}
pub trait TryHash {
fn try_hash<H: std::hash::Hasher>(&self, state: &mut H) -> Result<()>;
}
impl TryHash for Value {
fn try_hash<H: std::hash::Hasher>(&self, state: &mut H) -> Result<()> {
use Value::*;
match self {
Nil => 0x23845.hash(state),
Bool(b) => b.hash(state),
Int(i) => i.hash(state),
Ratio(r) => r.hash(state),
Regex(r) => r.as_str().hash(state),
String(s) => s.hash(state),
List(l) => {
for val in l.iter() {
val.try_hash(state)?;
}
}
Matrix(m) => {
m.domain.hash(state);
m.codomain.hash(state);
for val in m.values.iter() {
val.try_hash(state)?;
}
},
_ => return Err(exception!(HASH_EXCEPTION, "cannot hash {self:?}"))
};
Ok(())
}
}
impl ValueClone for ValueEntry {
fn deep_clone(&self) -> Self {
use ValueEntry as E;
match self {
E::Empty => E::Empty,
E::Taken((k, v)) => E::Taken((k.deep_clone(), v.deep_clone())),
E::Gravestone(g) => E::Gravestone(g.deep_clone()),
}
}
fn shallow_clone(&self) -> Self {
use ValueEntry as E;
match self {
E::Empty => E::Empty,
E::Taken((k, v)) => E::Taken((k.clone(), v.clone())),
E::Gravestone(g) => E::Gravestone(g.clone()),
}
}
}
impl ValueClone for ValueMap {
fn deep_clone(&self) -> Self {
let values = self.values.iter().map(|e| e.deep_clone()).collect();
Self {
values,
size: self.size,
used: self.used
}
}
fn shallow_clone(&self) -> Self {
let values = self.values.iter().map(|e| e.clone()).collect();
Self {
values,
size: self.size,
used: self.used
}
}
}
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