#![deny(
unsafe_op_in_unsafe_fn,
clippy::missing_safety_doc,
clippy::undocumented_unsafe_blocks
)]
#![warn(clippy::pedantic, clippy::nursery)]
#![allow(clippy::missing_const_for_fn)]
use std::{
borrow::Cow,
cell::RefCell,
fmt::{self, Display},
hash::{BuildHasherDefault, Hash, Hasher},
ops::Deref,
str,
};
use hashbrown::HashMap;
use jrsonnet_gcmodule::Trace;
use rustc_hash::FxHasher;
mod inner;
use inner::Inner;
#[derive(Clone, PartialOrd, Ord, Eq)]
pub struct IStr(Inner);
impl Trace for IStr {
fn is_type_tracked() -> bool {
false
}
}
impl IStr {
#[must_use]
pub fn empty() -> Self {
"".into()
}
#[must_use]
pub fn as_str(&self) -> &str {
self as &str
}
#[must_use]
pub fn cast_bytes(self) -> IBytes {
IBytes(self.0.clone())
}
}
impl Deref for IStr {
type Target = str;
fn deref(&self) -> &Self::Target {
unsafe { self.0.as_str_unchecked() }
}
}
impl PartialEq for IStr {
fn eq(&self, other: &Self) -> bool {
Inner::ptr_eq(&self.0, &other.0)
}
}
impl PartialEq<str> for IStr {
fn eq(&self, other: &str) -> bool {
self as &str == other
}
}
impl Hash for IStr {
fn hash<H: Hasher>(&self, state: &mut H) {
state.write_usize(Inner::as_ptr(&self.0).cast::<()>() as usize);
}
}
impl Drop for IStr {
fn drop(&mut self) {
#[cold]
#[inline(never)]
fn unpool(inner: &Inner) {
let res = POOL.try_with(|pool| pool.borrow_mut().remove(inner));
if res.is_ok() {
debug_assert_eq!(Inner::strong_count(inner), 1);
}
}
if Inner::strong_count(&self.0) <= 2 {
unpool(&self.0);
}
}
}
impl fmt::Debug for IStr {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
fmt::Debug::fmt(self as &str, f)
}
}
impl Display for IStr {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
fmt::Display::fmt(self as &str, f)
}
}
#[derive(Clone, PartialOrd, Ord, Eq)]
pub struct IBytes(Inner);
impl Trace for IBytes {
fn is_type_tracked() -> bool {
false
}
}
impl IBytes {
#[must_use]
pub fn cast_str(self) -> Option<IStr> {
if Inner::check_utf8(&self.0) {
Some(IStr(self.0.clone()))
} else {
None
}
}
unsafe fn cast_str_unchecked(self) -> IStr {
unsafe { Inner::assume_utf8(&self.0) };
IStr(self.0.clone())
}
#[must_use]
pub fn as_slice(&self) -> &[u8] {
self.0.as_slice()
}
}
impl Deref for IBytes {
type Target = [u8];
fn deref(&self) -> &Self::Target {
self.0.as_slice()
}
}
impl PartialEq for IBytes {
fn eq(&self, other: &Self) -> bool {
Inner::ptr_eq(&self.0, &other.0)
}
}
impl Hash for IBytes {
fn hash<H: Hasher>(&self, state: &mut H) {
state.write_usize(Inner::as_ptr(&self.0).cast::<()>() as usize);
}
}
impl Drop for IBytes {
fn drop(&mut self) {
#[cold]
#[inline(never)]
fn unpool(inner: &Inner) {
let res = POOL.try_with(|pool| pool.borrow_mut().remove(inner));
if res.is_ok() {
debug_assert_eq!(Inner::strong_count(inner), 1);
}
}
if Inner::strong_count(&self.0) <= 2 {
unpool(&self.0);
}
}
}
impl fmt::Debug for IBytes {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
fmt::Debug::fmt(self as &[u8], f)
}
}
impl<'c> From<Cow<'c, str>> for IStr {
fn from(v: Cow<'c, str>) -> Self {
intern_str(&v)
}
}
impl From<&str> for IStr {
fn from(v: &str) -> Self {
intern_str(v)
}
}
impl From<String> for IStr {
fn from(s: String) -> Self {
s.as_str().into()
}
}
impl From<&String> for IStr {
fn from(s: &String) -> Self {
s.as_str().into()
}
}
impl From<&[u8]> for IBytes {
fn from(v: &[u8]) -> Self {
intern_bytes(v)
}
}
#[cfg(feature = "serde")]
impl serde::Serialize for IStr {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: serde::Serializer,
{
self.as_str().serialize(serializer)
}
}
#[cfg(feature = "serde")]
impl<'de> serde::Deserialize<'de> for IStr {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: serde::Deserializer<'de>,
{
let str = <&str>::deserialize(deserializer)?;
Ok(intern_str(str))
}
}
#[cfg(feature = "structdump")]
impl structdump::Codegen for IStr {
fn gen_code(
&self,
res: &mut structdump::CodegenResult,
_unique: bool,
) -> structdump::TokenStream {
let s: &str = self;
res.add_code(
structdump::quote! {
structdump_import::IStr::from(#s)
},
Some(structdump::quote![structdump_import::IStr]),
false,
)
}
}
thread_local! {
static POOL: RefCell<HashMap<Inner, (), BuildHasherDefault<FxHasher>>> = RefCell::new(HashMap::with_capacity_and_hasher(200, BuildHasherDefault::default()));
}
#[must_use]
pub fn intern_bytes(bytes: &[u8]) -> IBytes {
POOL.with(|pool| {
let mut pool = pool.borrow_mut();
let entry = pool.raw_entry_mut().from_key(bytes);
match entry {
hashbrown::hash_map::RawEntryMut::Occupied(i) => IBytes(i.get_key_value().0.clone()),
hashbrown::hash_map::RawEntryMut::Vacant(e) => {
let (k, _) = e.insert(Inner::new_bytes(bytes), ());
IBytes(k.clone())
}
}
})
}
#[must_use]
pub fn intern_str(str: &str) -> IStr {
unsafe { intern_bytes(str.as_bytes()).cast_str_unchecked() }
}