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#[macro_use]
extern crate failure;
extern crate parking_lot;
#[macro_use]
extern crate log;
extern crate once_cell;
extern crate libsyntax2;
extern crate libeditor;
extern crate fst;
extern crate rayon;
mod symbol_index;
use once_cell::sync::OnceCell;
use rayon::prelude::*;
use std::{
sync::{
Arc,
atomic::{AtomicUsize, Ordering::SeqCst},
},
collections::hash_map::HashMap,
path::{PathBuf, Path},
time::Instant,
};
use libsyntax2::{
TextUnit,
ast::{self, AstNode},
algo::{find_leaf_at_offset, ancestors},
};
use libeditor::{LineIndex, FileSymbol};
use self::symbol_index::FileSymbols;
pub use self::symbol_index::Query;
pub type Result<T> = ::std::result::Result<T, ::failure::Error>;
const INDEXING_THRESHOLD: usize = 128;
pub struct WorldState {
data: Arc<WorldData>
}
#[derive(Clone, Debug)]
pub struct World {
data: Arc<WorldData>,
}
impl WorldState {
pub fn new() -> WorldState {
WorldState {
data: Arc::new(WorldData::default())
}
}
pub fn snapshot(&self) -> World {
World { data: self.data.clone() }
}
pub fn change_file(&mut self, path: PathBuf, text: Option<String>) {
self.change_files(::std::iter::once((path, text)));
}
pub fn change_files(&mut self, changes: impl Iterator<Item=(PathBuf, Option<String>)>) {
let data = self.data_mut();
let mut cnt = 0;
for (path, text) in changes {
cnt += 1;
data.file_map.remove(&path);
if let Some(text) = text {
let file_data = FileData::new(text);
data.file_map.insert(path, Arc::new(file_data));
} else {
data.file_map.remove(&path);
}
}
*data.unindexed.get_mut() += cnt;
}
fn data_mut(&mut self) -> &mut WorldData {
if Arc::get_mut(&mut self.data).is_none() {
self.data = Arc::new(WorldData {
unindexed: AtomicUsize::new(
self.data.unindexed.load(SeqCst)
),
file_map: self.data.file_map.clone(),
});
}
Arc::get_mut(&mut self.data).unwrap()
}
}
impl World {
pub fn file_syntax(&self, path: &Path) -> Result<ast::File> {
let data = self.file_data(path)?;
Ok(data.syntax(path).clone())
}
pub fn file_line_index(&self, path: &Path) -> Result<LineIndex> {
let data = self.file_data(path)?;
let index = data.lines
.get_or_init(|| {
trace!("calc line index: {}", path.display());
LineIndex::new(&data.text)
});
Ok(index.clone())
}
pub fn world_symbols<'a>(&'a self, mut query: Query) -> impl Iterator<Item=(&'a Path, &'a FileSymbol)> + 'a {
self.reindex();
self.data.file_map.iter()
.flat_map(move |(path, data)| {
let symbols = data.symbols();
let path: &'a Path = path.as_path();
query.process(symbols).into_iter().map(move |s| (path, s))
})
}
pub fn approximately_resolve_symbol<'a>(
&'a self,
path: &Path,
offset: TextUnit,
) -> Result<Vec<(&'a Path, &'a FileSymbol)>> {
let file = self.file_syntax(path)?;
let syntax = file.syntax();
let syntax = syntax.as_ref();
let name_ref =
find_leaf_at_offset(syntax, offset)
.left_biased()
.into_iter()
.flat_map(|node| ancestors(node))
.flat_map(ast::NameRef::cast)
.next();
let name = match name_ref {
None => return Ok(vec![]),
Some(name_ref) => name_ref.text(),
};
let mut query = Query::new(name.to_string());
query.exact();
query.limit(4);
Ok(self.world_symbols(query).collect())
}
fn reindex(&self) {
let data = &*self.data;
let unindexed = data.unindexed.load(SeqCst);
if unindexed < INDEXING_THRESHOLD {
return;
}
if unindexed == data.unindexed.compare_and_swap(unindexed, 0, SeqCst) {
let now = Instant::now();
data.file_map
.par_iter()
.for_each(|(_, data)| {
data.symbols();
});
info!("parallel indexing took {:?}", now.elapsed());
}
}
fn file_data(&self, path: &Path) -> Result<Arc<FileData>> {
match self.data.file_map.get(path) {
Some(data) => Ok(data.clone()),
None => bail!("unknown file: {}", path.display()),
}
}
}
pub type SearchResult = ::std::result::Result<Continue, Break>;
pub struct Continue;
pub struct Break;
pub const CONTINUE: SearchResult = Ok(Continue);
pub const BREAK: SearchResult = Err(Break);
#[derive(Default, Debug)]
struct WorldData {
unindexed: AtomicUsize,
file_map: HashMap<PathBuf, Arc<FileData>>,
}
#[derive(Debug)]
struct FileData {
text: String,
symbols: OnceCell<FileSymbols>,
syntax: OnceCell<ast::File>,
lines: OnceCell<LineIndex>,
}
impl FileData {
fn new(text: String) -> FileData {
FileData {
text,
symbols: OnceCell::new(),
syntax: OnceCell::new(),
lines: OnceCell::new(),
}
}
fn syntax(&self, path: &Path) -> &ast::File {
self.syntax
.get_or_init(|| {
trace!("parsing: {}", path.display());
ast::File::parse(&self.text)
})
}
fn syntax_transient(&self) -> ast::File {
self.syntax.get().map(|s| s.clone())
.unwrap_or_else(|| ast::File::parse(&self.text))
}
fn symbols(&self) -> &FileSymbols {
let syntax = self.syntax_transient();
self.symbols
.get_or_init(|| FileSymbols::new(&syntax))
}
}
|
