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use std::{
collections::HashMap,
time::Instant,
sync::Arc,
panic,
};
use once_cell::sync::OnceCell;
use rayon::prelude::*;
use libeditor::LineIndex;
use libsyntax2::File;
use {
FileId,
module_map::{ModuleMap, ChangeKind},
symbol_index::SymbolIndex,
};
pub(crate) trait SourceRoot {
fn contains(&self, file_id: FileId) -> bool;
fn module_map(&self) -> &ModuleMap;
fn lines(&self, file_id: FileId) -> &LineIndex;
fn syntax(&self, file_id: FileId) -> &File;
fn symbols<'a>(&'a self, acc: &mut Vec<&'a SymbolIndex>);
}
#[derive(Clone, Default, Debug)]
pub(crate) struct WritableSourceRoot {
file_map: HashMap<FileId, Arc<(FileData, OnceCell<SymbolIndex>)>>,
module_map: ModuleMap,
}
impl WritableSourceRoot {
pub fn update(&mut self, file_id: FileId, text: Option<String>) {
let change_kind = if self.file_map.remove(&file_id).is_some() {
if text.is_some() {
ChangeKind::Update
} else {
ChangeKind::Delete
}
} else {
ChangeKind::Insert
};
self.module_map.update_file(file_id, change_kind);
self.file_map.remove(&file_id);
if let Some(text) = text {
let file_data = FileData::new(text);
self.file_map.insert(file_id, Arc::new((file_data, Default::default())));
}
}
pub fn reindex(&self) {
let now = Instant::now();
self.file_map
.par_iter()
.for_each(|(&file_id, data)| {
symbols(file_id, data);
});
info!("parallel indexing took {:?}", now.elapsed());
}
fn data(&self, file_id: FileId) -> &FileData {
match self.file_map.get(&file_id) {
Some(data) => &data.0,
None => panic!("unknown file: {:?}", file_id),
}
}
}
impl SourceRoot for WritableSourceRoot {
fn contains(&self, file_id: FileId) -> bool {
self.file_map.contains_key(&file_id)
}
fn module_map(&self) -> &ModuleMap {
&self.module_map
}
fn lines(&self, file_id: FileId) -> &LineIndex {
self.data(file_id).lines()
}
fn syntax(&self, file_id: FileId) -> &File {
self.data(file_id).syntax()
}
fn symbols<'a>(&'a self, acc: &mut Vec<&'a SymbolIndex>) {
acc.extend(
self.file_map
.iter()
.map(|(&file_id, data)| symbols(file_id, data))
)
}
}
fn symbols(file_id: FileId, (data, symbols): &(FileData, OnceCell<SymbolIndex>)) -> &SymbolIndex {
let syntax = data.syntax_transient();
symbols.get_or_init(|| SymbolIndex::for_file(file_id, syntax))
}
#[derive(Debug)]
struct FileData {
text: String,
lines: OnceCell<LineIndex>,
syntax: OnceCell<File>,
}
impl FileData {
fn new(text: String) -> FileData {
FileData {
text,
syntax: OnceCell::new(),
lines: OnceCell::new(),
}
}
fn lines(&self) -> &LineIndex {
self.lines.get_or_init(|| LineIndex::new(&self.text))
}
fn syntax(&self) -> &File {
let text = &self.text;
let syntax = &self.syntax;
match panic::catch_unwind(panic::AssertUnwindSafe(|| syntax.get_or_init(|| File::parse(text)))) {
Ok(file) => file,
Err(err) => {
error!("Parser paniced on:\n------\n{}\n------\n", text);
panic::resume_unwind(err)
}
}
}
fn syntax_transient(&self) -> File {
self.syntax.get().map(|s| s.clone())
.unwrap_or_else(|| File::parse(&self.text))
}
}
#[derive(Debug)]
pub(crate) struct ReadonlySourceRoot {
symbol_index: SymbolIndex,
file_map: HashMap<FileId, FileData>,
module_map: ModuleMap,
}
impl ReadonlySourceRoot {
pub fn new(files: Vec<(FileId, String)>) -> ReadonlySourceRoot {
let mut module_map = ModuleMap::new();
let file_map: HashMap<FileId, FileData> = files
.into_iter()
.map(|(id, text)| {
module_map.update_file(id, ChangeKind::Insert);
(id, FileData::new(text))
})
.collect();
let symbol_index = SymbolIndex::for_files(
file_map.par_iter().map(|(&file_id, file_data)| {
(file_id, file_data.syntax_transient())
})
);
ReadonlySourceRoot {
symbol_index,
file_map,
module_map,
}
}
fn data(&self, file_id: FileId) -> &FileData {
match self.file_map.get(&file_id) {
Some(data) => data,
None => panic!("unknown file: {:?}", file_id),
}
}
}
impl SourceRoot for ReadonlySourceRoot {
fn contains(&self, file_id: FileId) -> bool {
self.file_map.contains_key(&file_id)
}
fn module_map(&self) -> &ModuleMap {
&self.module_map
}
fn lines(&self, file_id: FileId) -> &LineIndex {
self.data(file_id).lines()
}
fn syntax(&self, file_id: FileId) -> &File {
self.data(file_id).syntax()
}
fn symbols<'a>(&'a self, acc: &mut Vec<&'a SymbolIndex>) {
acc.push(&self.symbol_index)
}
}
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