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|
use std::{
hash::Hash,
sync::Arc,
cell::RefCell,
};
use libsyntax2::{File};
use im;
use {
FileId,
imp::{FileResolverImp},
};
#[derive(Clone)]
pub(crate) struct Db {
file_resolver: FileResolverImp,
files: im::HashMap<FileId, Arc<String>>,
}
impl Db {
pub(crate) fn new() -> Db {
Db {
file_resolver: FileResolverImp::default(),
files: im::HashMap::new(),
}
}
pub(crate) fn change_file(&mut self, file_id: FileId, text: Option<String>) {
match text {
None => {
self.files.remove(&file_id);
}
Some(text) => {
self.files.insert(file_id, Arc::new(text));
}
}
}
pub(crate) fn set_file_resolver(&mut self, file_resolver: FileResolverImp) {
self.file_resolver = file_resolver
}
pub(crate) fn query_ctx(&self) -> QueryCtx {
QueryCtx {
db: self.clone(),
trace: RefCell::new(Vec::new()),
}
}
}
pub(crate) struct QueryCtx {
db: 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 {
self.trace(TraceEvent { query_id: Q::ID, kind: TraceEventKind::Start });
let res = Q::get(self, params);
self.trace(TraceEvent { query_id: Q::ID, kind: TraceEventKind::Finish });
res
}
fn trace(&self, event: TraceEvent) {
self.trace.borrow_mut().push(event)
}
}
pub(crate) trait Query {
const ID: u32;
type Params: Hash;
type Output;
}
pub(crate) trait Get: Query {
fn get(ctx: &QueryCtx, params: &Self::Params) -> Self::Output;
}
impl<T: Eval> Get for T {
fn get(ctx: &QueryCtx, params: &Self::Params) -> Self::Output {
Self::eval(ctx, params)
}
}
pub(crate) trait Eval: Query {
fn eval(ctx: &QueryCtx, params: &Self::Params) -> Self::Output;
}
pub(crate) struct DbFiles {
db: 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: ctx.db.clone() }
}
}
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)
}
}
|
