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|
use libeditor::{FileSymbol, file_symbols};
use libsyntax2::{
ParsedFile,
SyntaxKind::{self, *},
};
use fst::{self, IntoStreamer, Streamer};
#[derive(Debug)]
pub(crate) struct FileSymbols {
symbols: Vec<FileSymbol>,
map: fst::Map,
}
impl FileSymbols {
pub(crate) fn new(file: &ParsedFile) -> FileSymbols {
let mut symbols = file_symbols(file)
.into_iter()
.map(|s| (s.name.as_str().to_lowercase(), s))
.collect::<Vec<_>>();
symbols.sort_by(|s1, s2| s1.0.cmp(&s2.0));
symbols.dedup_by(|s1, s2| s1.0 == s2.0);
let (names, symbols): (Vec<String>, Vec<FileSymbol>) =
symbols.into_iter().unzip();
let map = fst::Map::from_iter(
names.into_iter().zip(0u64..)
).unwrap();
FileSymbols { symbols, map }
}
}
pub struct Query {
query: String,
lowercased: String,
only_types: bool,
exact: bool,
limit: usize,
}
impl Query {
pub fn new(query: String) -> Query {
let lowercased = query.to_lowercase();
Query {
query,
lowercased,
only_types: false,
exact: false,
limit: usize::max_value()
}
}
pub fn only_types(&mut self) {
self.only_types = true;
}
pub fn exact(&mut self) {
self.exact = true;
}
pub fn limit(&mut self, limit: usize) {
self.limit = limit
}
pub(crate) fn process(
&mut self,
file: &FileSymbols,
) -> Vec<FileSymbol> {
fn is_type(kind: SyntaxKind) -> bool {
match kind {
STRUCT_DEF | ENUM_DEF | TRAIT_DEF | TYPE_DEF => true,
_ => false,
}
}
let automaton = fst::automaton::Subsequence::new(&self.lowercased);
let mut stream = file.map.search(automaton).into_stream();
let mut res = Vec::new();
while let Some((_, idx)) = stream.next() {
if self.limit == 0 {
break;
}
let idx = idx as usize;
let symbol = &file.symbols[idx];
if self.only_types && !is_type(symbol.kind) {
continue;
}
if self.exact && symbol.name != self.query {
continue;
}
res.push(symbol.clone());
self.limit -= 1;
}
res
}
}
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