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|
use std::{
hash::Hash,
sync::Arc,
cell::RefCell,
fmt::Debug,
};
use parking_lot::Mutex;
use libsyntax2::{File};
use im;
use {
FileId,
imp::{FileResolverImp},
module_map_db::ModuleDescr,
};
#[derive(Debug)]
pub(crate) struct DbHost {
db: Arc<Db>,
}
impl DbHost {
pub(crate) fn new() -> DbHost {
let db = Db {
file_resolver: FileResolverImp::default(),
files: im::HashMap::new(),
cache: Mutex::new(Cache::new())
};
DbHost { db: Arc::new(db) }
}
pub(crate) fn change_file(&mut self, file_id: FileId, text: Option<String>) {
let db = self.db_mut();
match text {
None => {
db.files.remove(&file_id);
}
Some(text) => {
db.files.insert(file_id, Arc::new(text));
}
}
}
pub(crate) fn set_file_resolver(&mut self, file_resolver: FileResolverImp) {
let db = self.db_mut();
db.file_resolver = file_resolver
}
pub(crate) fn query_ctx(&self) -> QueryCtx {
QueryCtx {
db: Arc::clone(&self.db),
trace: RefCell::new(Vec::new()),
}
}
fn db_mut(&mut self) -> &mut Db {
// NB: this "forks" the database & clears the cache
let db = Arc::make_mut(&mut self.db);
*db.cache.get_mut() = Default::default();
db
}
}
#[derive(Debug)]
pub(crate) struct Db {
file_resolver: FileResolverImp,
files: im::HashMap<FileId, Arc<String>>,
cache: Mutex<Cache>,
}
impl Clone for Db {
fn clone(&self) -> Db {
Db {
file_resolver: self.file_resolver.clone(),
files: self.files.clone(),
cache: Mutex::new(Cache::new()),
}
}
}
#[derive(Clone, Default, Debug)]
pub(crate) struct Cache {
pub(crate) module_descr: QueryCache<ModuleDescr>
}
#[allow(type_alias_bounds)]
pub(crate) type QueryCache<Q: Query> = im::HashMap<
<Q as Query>::Params,
<Q as Query>::Output
>;
impl Cache {
fn new() -> Cache {
Default::default()
}
}
pub(crate) struct QueryCtx {
db: Arc<Db>,
pub(crate) trace: RefCell<Vec<TraceEvent>>,
}
#[derive(Clone, Copy, Debug)]
pub(crate) struct TraceEvent {
pub(crate) query_id: u32,
pub(crate) kind: TraceEventKind
}
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub(crate) enum TraceEventKind {
Start, Finish
}
impl QueryCtx {
pub(crate) fn get<Q: Get>(&self, params: &Q::Params) -> Q::Output {
let res = Q::get(self, params);
res
}
fn trace(&self, event: TraceEvent) {
self.trace.borrow_mut().push(event)
}
}
pub(crate) trait Query {
const ID: u32;
type Params: Hash + Eq + Debug;
type Output: Debug;
}
pub(crate) trait Get: Query {
fn get(ctx: &QueryCtx, params: &Self::Params) -> Self::Output;
}
impl<T: Eval> Get for T
where
T::Params: Clone,
T::Output: Clone,
{
fn get(ctx: &QueryCtx, params: &Self::Params) -> Self::Output {
{
let mut cache = ctx.db.cache.lock();
if let Some(cache) = Self::cache(&mut cache) {
if let Some(res) = cache.get(params) {
return res.clone();
}
}
}
ctx.trace(TraceEvent { query_id: Self::ID, kind: TraceEventKind::Start });
let res = Self::eval(ctx, params);
ctx.trace(TraceEvent { query_id: Self::ID, kind: TraceEventKind::Finish });
let mut cache = ctx.db.cache.lock();
if let Some(cache) = Self::cache(&mut cache) {
cache.insert(params.clone(), res.clone());
}
res
}
}
pub(crate) trait Eval: Query
where
Self::Params: Clone,
Self::Output: Clone,
{
fn cache(_cache: &mut Cache) -> Option<&mut QueryCache<Self>> {
None
}
fn eval(ctx: &QueryCtx, params: &Self::Params) -> Self::Output;
}
#[derive(Debug)]
pub(crate) struct DbFiles {
db: Arc<Db>,
}
impl DbFiles {
pub(crate) fn iter<'a>(&'a self) -> impl Iterator<Item=FileId> + 'a {
self.db.files.keys().cloned()
}
pub(crate) fn file_resolver(&self) -> FileResolverImp {
self.db.file_resolver.clone()
}
}
pub(crate) enum Files {}
impl Query for Files {
const ID: u32 = 1;
type Params = ();
type Output = DbFiles;
}
impl Get for Files {
fn get(ctx: &QueryCtx, _params: &()) -> DbFiles {
DbFiles { db: Arc::clone(&ctx.db) }
}
}
enum FileText {}
impl Query for FileText {
const ID: u32 = 10;
type Params = FileId;
type Output = Arc<String>;
}
impl Get for FileText {
fn get(ctx: &QueryCtx, file_id: &FileId) -> Arc<String> {
ctx.db.files[file_id].clone()
}
}
pub(crate) enum FileSyntax {}
impl Query for FileSyntax {
const ID: u32 = 20;
type Params = FileId;
type Output = File;
}
impl Eval for FileSyntax {
fn eval(ctx: &QueryCtx, file_id: &FileId) -> File {
let text = ctx.get::<FileText>(file_id);
File::parse(&text)
}
}
|
