list remove

This commit is contained in:
Michael Zhang 2020-02-20 21:38:01 -06:00
parent f6752c9af3
commit c649c0c8d7
Signed by: michael
GPG key ID: BDA47A31A3C8EE6B
5 changed files with 305 additions and 79 deletions

277
Cargo.lock generated
View file

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"checksum remove_dir_all 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)" = "4a83fa3702a688b9359eccba92d153ac33fd2e8462f9e0e3fdf155239ea7792e"
"checksum rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "138e3e0acb6c9fb258b19b67cb8abd63c00679d2851805ea151465464fe9030a"
"checksum rusty-fork 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "3dd93264e10c577503e926bd1430193eeb5d21b059148910082245309b424fae"
"checksum ryu 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "bfa8506c1de11c9c4e4c38863ccbe02a305c8188e85a05a784c9e11e1c3910c8"
"checksum scopeguard 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b42e15e59b18a828bbf5c58ea01debb36b9b096346de35d941dcb89009f24a0d"
"checksum semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1d7eb9ef2c18661902cc47e535f9bc51b78acd254da71d375c2f6720d9a40403"
@ -641,10 +803,11 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
"checksum stdweb-internal-macros 0.2.9 (registry+https://github.com/rust-lang/crates.io-index)" = "58fa5ff6ad0d98d1ffa8cb115892b6e69d67799f6763e162a1c9db421dc22e11"
"checksum stdweb-internal-runtime 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "213701ba3370744dcd1a12960caa4843b3d68b4d1c0a5d575e0d65b2ee9d16c0"
"checksum syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)" = "af6f3550d8dff9ef7dc34d384ac6f107e5d31c8f57d9f28e0081503f547ac8f5"
"checksum tempfile 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7a6e24d9338a0a5be79593e2fa15a648add6138caa803e2d5bc782c371732ca9"
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View file

@ -20,12 +20,11 @@ members = [
default = ["web"]
web = ["stdweb"]
[dev-dependencies]
quickcheck = "0.9.2"
quickcheck_macros = "0.9.1"
[dependencies]
enterprise-compiler = { path = "enterprise-compiler" }
stdweb = { version = "0.4.20", optional = true }
parking_lot = "0.10.0"
symbol = { path = "symbol" }
[dev-dependencies]
proptest = "0.9.5"

View file

@ -0,0 +1,8 @@
# Seeds for failure cases proptest has generated in the past. It is
# automatically read and these particular cases re-run before any
# novel cases are generated.
#
# It is recommended to check this file in to source control so that
# everyone who runs the test benefits from these saved cases.
cc 996e4a6b3f149a995d2d85203c8d824bf86295dc1fb078ed87cdb77489d8a44b # shrinks to mut vec = [0, 0], index = Index(0)
cc 369740f4b70d4b7bec3d743873870dcd5fee9abe687d2aaac66784532d49ae4f # shrinks to mut vec = [], index = Index(0)

View file

@ -8,10 +8,6 @@ pub extern crate enterprise_compiler;
pub extern crate parking_lot;
pub extern crate stdweb;
#[cfg(test)]
#[macro_use(quickcheck)]
extern crate quickcheck_macros;
mod backend;
pub mod compiler;
pub mod std;

View file

@ -1,6 +1,7 @@
use std::marker::PhantomData;
use std::fmt::{self, Debug, Formatter};
use std::collections::HashMap;
use std::fmt::{self, Debug, Formatter, Write};
use std::marker::PhantomData;
use std::mem;
use std::ptr::NonNull;
use symbol::Symbol;
@ -16,10 +17,11 @@ pub struct List<T> {
map: HashMap<Symbol, NonNull<Node<T>>>,
}
#[derive(Debug)]
struct Node<T> {
prev: Option<NonNull<Node<T>>>,
next: Option<NonNull<Node<T>>>,
data: T,
data: Option<T>,
}
/// Referential iterator
@ -31,7 +33,7 @@ impl<'a, T> Iterator for Iter<'a, T> {
fn next(&mut self) -> Option<Self::Item> {
if let Some(node) = self.0 {
self.0 = unsafe { (*node.as_ptr()).next };
Some(unsafe { &(*node.as_ptr()).data })
unsafe { &(*node.as_ptr()).data }.as_ref()
} else {
None
}
@ -42,13 +44,13 @@ impl<'a, T> Iterator for Iter<'a, T> {
pub struct IntoIter<T>(Option<NonNull<Node<T>>>);
impl<T> Iterator for IntoIter<T> {
type Item = Box<T>;
type Item = T;
fn next(&mut self) -> Option<Self::Item> {
if let Some(node) = self.0 {
let node_ptr = node.as_ptr();
self.0 = unsafe { (*node_ptr).next };
Some(unsafe { Box::from_raw(&mut (*node_ptr).data) })
unsafe { Box::from_raw(&mut (*node_ptr).data) }.take()
} else {
None
}
@ -111,7 +113,7 @@ impl<T> List<T> {
/// Returns the tail of the list
pub fn tail(&self) -> Option<&T> {
if let Some(ref node) = self.tail {
Some(&unsafe { node.as_ref() }.data)
unsafe { node.as_ref() }.data.as_ref()
} else {
None
}
@ -122,7 +124,7 @@ impl<T> List<T> {
let node = Node {
prev: None,
next: None,
data: item,
data: Some(item),
};
let mut node = unsafe { NonNull::new_unchecked(Box::into_raw(Box::new(node))) };
let new_key = Symbol::gensym();
@ -140,18 +142,76 @@ impl<T> List<T> {
self.map.insert(new_key, node);
new_key
}
/// Removes an element from the list
pub fn remove(&mut self, key: Symbol) -> Option<T> {
if let Some(node) = self.map.get(&key) {
let mut node = unsafe { Box::from_raw(node.as_ptr()) };
let data = node.data.take();
let prev = node.prev;
let next = node.next;
if let Some(mut prev) = prev {
(*unsafe { prev.as_mut() }).next = next;
} else if let Some(_) = self.head {
self.head = next;
} else {
// shouldn't be any other cases
unreachable!();
}
data
} else {
None
}
}
}
#[cfg(test)]
mod tests {
use super::List;
use proptest::{
arbitrary::any,
collection::{vec, SizeRange},
prelude::*,
sample::Index,
};
#[quickcheck]
fn list_equivalence(vec: Vec<u32>) -> bool {
let mut list = List::new();
for item in vec.iter() {
list.insert(*item);
proptest! {
#[test]
fn test_list_equivalence(vec in vec(any::<u32>(), SizeRange::default())) {
let mut list = List::new();
for item in vec.iter() {
list.insert(*item);
}
prop_assert!(list.iter().eq(vec.iter()));
}
#[test]
fn test_remove_by_key(mut vec in vec(any::<u32>(), SizeRange::default()), index in any::<Index>()) {
if vec.len() == 0 {
return Err(TestCaseError::reject("can't remove from a 0-sized vec"));
}
let index = index.index(vec.len());
if index >= vec.len() {
return Err(TestCaseError::reject("ind is bigger than vec"));
}
let mut list = List::new();
let mut saved_key = None;
for (i, item) in vec.iter().enumerate() {
let key = list.insert(*item);
if i == index {
saved_key = Some(key);
}
}
if let Some(saved_key) = saved_key {
list.remove(saved_key);
vec.remove(index);
prop_assert!(list.iter().eq(vec.iter()));
} else {
return Err(TestCaseError::fail("saved key wasn't found? this shouldn't ever happen"));
}
}
list.iter().eq(vec.iter())
}
}