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use std::{panic, sync::Arc};
use once_cell::sync::OnceCell;
use ra_editor::LineIndex;
use ra_syntax::File;
use rayon::prelude::*;
use rustc_hash::{FxHashMap, FxHashSet};
use salsa::Database;
use crate::{
db::{self, FilesDatabase, SyntaxDatabase},
descriptors::{ModuleDescriptor, ModuleTreeDescriptor},
imp::FileResolverImp,
module_map::ModulesDatabase,
symbol_index::SymbolIndex,
FileId,
};
pub(crate) trait SourceRoot {
fn contains(&self, file_id: FileId) -> bool;
fn module_tree(&self) -> Arc<ModuleTreeDescriptor>;
fn lines(&self, file_id: FileId) -> Arc<LineIndex>;
fn syntax(&self, file_id: FileId) -> File;
fn symbols(&self, acc: &mut Vec<Arc<SymbolIndex>>);
}
#[derive(Default, Debug, Clone)]
pub(crate) struct WritableSourceRoot {
db: db::RootDatabase,
}
impl WritableSourceRoot {
pub fn apply_changes(
&mut self,
changes: &mut dyn Iterator<Item = (FileId, Option<String>)>,
file_resolver: Option<FileResolverImp>,
) {
let mut changed = FxHashSet::default();
let mut removed = FxHashSet::default();
for (file_id, text) in changes {
match text {
None => {
removed.insert(file_id);
}
Some(text) => {
self.db
.query(db::FileTextQuery)
.set(file_id, Arc::new(text));
changed.insert(file_id);
}
}
}
let file_set = self.db.file_set();
let mut files: FxHashSet<FileId> = file_set.files.clone();
for file_id in removed {
files.remove(&file_id);
}
files.extend(changed);
let resolver = file_resolver.unwrap_or_else(|| file_set.resolver.clone());
self.db
.query(db::FileSetQuery)
.set((), Arc::new(db::FileSet { files, resolver }));
}
}
impl SourceRoot for WritableSourceRoot {
fn module_tree(&self) -> Arc<ModuleTreeDescriptor> {
self.db.module_tree()
}
fn contains(&self, file_id: FileId) -> bool {
self.db.file_set().files.contains(&file_id)
}
fn lines(&self, file_id: FileId) -> Arc<LineIndex> {
self.db.file_lines(file_id)
}
fn syntax(&self, file_id: FileId) -> File {
self.db.file_syntax(file_id)
}
fn symbols<'a>(&'a self, acc: &mut Vec<Arc<SymbolIndex>>) {
let db = &self.db;
let symbols = db.file_set();
let symbols = symbols
.files
.iter()
.map(|&file_id| db.file_symbols(file_id));
acc.extend(symbols);
}
}
#[derive(Debug)]
struct FileData {
text: String,
lines: OnceCell<Arc<LineIndex>>,
syntax: OnceCell<File>,
}
impl FileData {
fn new(text: String) -> FileData {
FileData {
text,
syntax: OnceCell::new(),
lines: OnceCell::new(),
}
}
fn lines(&self) -> &Arc<LineIndex> {
self.lines
.get_or_init(|| Arc::new(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)
}
}
}
}
#[derive(Debug)]
pub(crate) struct ReadonlySourceRoot {
symbol_index: Arc<SymbolIndex>,
file_map: FxHashMap<FileId, FileData>,
module_tree: Arc<ModuleTreeDescriptor>,
}
impl ReadonlySourceRoot {
pub(crate) fn new(
files: Vec<(FileId, String)>,
file_resolver: FileResolverImp,
) -> ReadonlySourceRoot {
let modules = files
.par_iter()
.map(|(file_id, text)| {
let syntax = File::parse(text);
let mod_descr = ModuleDescriptor::new(syntax.ast());
(*file_id, syntax, mod_descr)
})
.collect::<Vec<_>>();
let module_tree =
ModuleTreeDescriptor::new(modules.iter().map(|it| (it.0, &it.2)), &file_resolver);
let symbol_index =
SymbolIndex::for_files(modules.par_iter().map(|it| (it.0, it.1.clone())));
let file_map: FxHashMap<FileId, FileData> = files
.into_iter()
.map(|(id, text)| (id, FileData::new(text)))
.collect();
ReadonlySourceRoot {
symbol_index: Arc::new(symbol_index),
file_map,
module_tree: Arc::new(module_tree),
}
}
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 module_tree(&self) -> Arc<ModuleTreeDescriptor> {
Arc::clone(&self.module_tree)
}
fn contains(&self, file_id: FileId) -> bool {
self.file_map.contains_key(&file_id)
}
fn lines(&self, file_id: FileId) -> Arc<LineIndex> {
Arc::clone(self.data(file_id).lines())
}
fn syntax(&self, file_id: FileId) -> File {
self.data(file_id).syntax().clone()
}
fn symbols(&self, acc: &mut Vec<Arc<SymbolIndex>>) {
acc.push(Arc::clone(&self.symbol_index))
}
}
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