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use std::{
hash::{Hash, Hasher},
sync::Arc,
};
use fst::{self, Streamer};
use ra_editor::{file_symbols, FileSymbol};
use ra_syntax::{
File,
SyntaxKind::{self, *},
};
use rayon::prelude::*;
use crate::{FileId, Query};
#[derive(Default, Debug)]
pub(crate) struct SymbolIndex {
symbols: Vec<(FileId, FileSymbol)>,
map: fst::Map,
}
impl PartialEq for SymbolIndex {
fn eq(&self, other: &SymbolIndex) -> bool {
self.symbols == other.symbols
}
}
impl Eq for SymbolIndex {}
impl Hash for SymbolIndex {
fn hash<H: Hasher>(&self, hasher: &mut H) {
self.symbols.hash(hasher)
}
}
impl SymbolIndex {
pub(crate) fn for_files(files: impl ParallelIterator<Item = (FileId, File)>) -> SymbolIndex {
let mut symbols = files
.flat_map(|(file_id, file)| {
file_symbols(&file)
.into_iter()
.map(move |symbol| (symbol.name.as_str().to_lowercase(), (file_id, symbol)))
.collect::<Vec<_>>()
})
.collect::<Vec<_>>();
symbols.par_sort_by(|s1, s2| s1.0.cmp(&s2.0));
symbols.dedup_by(|s1, s2| s1.0 == s2.0);
let (names, symbols): (Vec<String>, Vec<(FileId, FileSymbol)>) =
symbols.into_iter().unzip();
let map = fst::Map::from_iter(names.into_iter().zip(0u64..)).unwrap();
SymbolIndex { symbols, map }
}
pub(crate) fn for_file(file_id: FileId, file: File) -> SymbolIndex {
SymbolIndex::for_files(rayon::iter::once((file_id, file)))
}
}
impl Query {
pub(crate) fn search(self, indices: &[Arc<SymbolIndex>]) -> Vec<(FileId, FileSymbol)> {
let mut op = fst::map::OpBuilder::new();
for file_symbols in indices.iter() {
let automaton = fst::automaton::Subsequence::new(&self.lowercased);
op = op.add(file_symbols.map.search(automaton))
}
let mut stream = op.union();
let mut res = Vec::new();
while let Some((_, indexed_values)) = stream.next() {
if res.len() >= self.limit {
break;
}
for indexed_value in indexed_values {
let file_symbols = &indices[indexed_value.index];
let idx = indexed_value.value as usize;
let (file_id, symbol) = &file_symbols.symbols[idx];
if self.only_types && !is_type(symbol.kind) {
continue;
}
if self.exact && symbol.name != self.query {
continue;
}
res.push((*file_id, symbol.clone()));
}
}
res
}
}
fn is_type(kind: SyntaxKind) -> bool {
match kind {
STRUCT_DEF | ENUM_DEF | TRAIT_DEF | TYPE_DEF => true,
_ => false,
}
}
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