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use std::collections::HashMap;
use std::fmt::Debug;
use std::hash::Hash;
use std::rc::{Rc, Weak};
use quickcheck::{Arbitrary, Gen, quickcheck};
use weak_table::WeakKeyHashMap;
use self::Cmd::*;
fn test_script<K, V>(script: &Script<K, V>) -> bool
where K: Clone + Debug + Eq + Hash,
V: Clone + Debug + Eq
{
let mut tester = Tester::with_capacity(4);
tester.execute_script(script);
tester.check()
}
quickcheck! {
fn prop_u8_u8(script: Script<u8, u8>) -> bool {
test_script(&script)
}
fn prop_string_usize(script: Script<String, usize>) -> bool {
test_script(&script)
}
}
#[derive(Clone, Debug)]
pub enum Cmd<K, V>
{
Insert(K, V),
Reinsert(usize, V),
RemoveInserted(usize),
RemoveOther(K),
ForgetInserted(usize),
}
#[derive(Clone, Debug)]
pub struct Script<K, V>(Vec<Cmd<K, V>>);
#[derive(Clone, Debug)]
pub struct Tester<K: Hash + Eq, V> {
weak: WeakKeyHashMap<Weak<K>, V>,
strong: HashMap<Rc<K>, V>,
log: Vec<K>,
}
impl<K, V> Tester<K, V>
where K: Hash + Eq + Clone + Debug,
V: Eq + Clone + Debug
{
pub fn new() -> Self {
Tester::with_capacity(8)
}
pub fn with_capacity(capacity: usize) -> Self {
Tester {
weak: WeakKeyHashMap::with_capacity(capacity),
strong: HashMap::new(),
log: Vec::new(),
}
}
pub fn check(&self) -> bool {
let copy = self.weak.iter().map(|(k, v)| (k, v.clone())).collect();
if self.strong == copy {
// eprintln!("Tester::check: succeeded: {:?}", self.weak);
true
} else {
eprintln!("Tester::check: failed: {:?} ≠ {:?}", self.strong, copy);
false
}
}
pub fn execute_script(&mut self, script: &Script<K, V>) {
// eprintln!("\n*** Starting script ***");
for cmd in &script.0 {
self.execute_command(cmd);
}
}
pub fn execute_command(&mut self, cmd: &Cmd<K, V>) {
// eprintln!("Executing command: {:?}", cmd);
match *cmd {
Insert(ref k, ref v) => self.insert(k, v, true),
Reinsert(index, ref v) => self.reinsert(index, v),
RemoveInserted(index) => self.remove_inserted(index),
RemoveOther(ref k) => self.remove_other(k),
ForgetInserted(index) => self.forget_inserted(index),
}
// eprintln!("Table state: {:?}", self.weak);
}
pub fn insert(&mut self, key: &K, value: &V, log: bool) {
let key_ptr = Rc::new(key.clone());
self.weak.insert(key_ptr.clone(), value.clone());
self.strong.remove(key);
self.strong.insert(key_ptr, value.clone());
if log { self.log.push(key.clone()); }
}
pub fn reinsert(&mut self, index: usize, value: &V) {
if let Some(key) = self.nth_key_mod_len(index) {
self.insert(&key, value, false);
}
}
pub fn remove_inserted(&mut self, index: usize) {
if let Some(key) = self.nth_key_mod_len(index) {
self.strong.remove(&key);
self.weak.remove(&key);
}
}
pub fn remove_other(&mut self, key: &K) {
self.strong.remove(key);
self.weak.remove(key);
}
pub fn forget_inserted(&mut self, index: usize) {
if let Some(key) = self.nth_key_mod_len(index) {
self.strong.remove(&key);
}
}
fn nth_key_mod_len(&self, n: usize) -> Option<K>
{
if self.log.is_empty() {
None
} else {
Some(self.log[n % self.log.len()].clone())
}
}
}
impl<K: Arbitrary, V: Arbitrary> Arbitrary for Cmd<K, V> {
fn arbitrary(g: &mut Gen) -> Self {
let choice = u8::arbitrary(g);
match choice % 10 {
0..=3 => Insert(K::arbitrary(g), V::arbitrary(g)),
4 => Reinsert(usize::arbitrary(g), V::arbitrary(g)),
5..=6 => RemoveInserted(usize::arbitrary(g)),
7 => RemoveOther(K::arbitrary(g)),
8..=9 => ForgetInserted(usize::arbitrary(g)),
_ => unreachable!(),
}
}
}
impl<K: Arbitrary, V: Arbitrary> Arbitrary for Script<K, V> {
fn arbitrary(g: &mut Gen) -> Self {
Script(Vec::<Cmd<K, V>>::arbitrary(g))
}
fn shrink(&self) -> Box<dyn Iterator<Item=Self>> {
Box::new(self.0.shrink().map(|v| Script(v)))
}
}
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