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use fuzzy_matcher::skim::SkimMatcherV2 as Matcher;
use fuzzy_matcher::FuzzyMatcher;
#[cfg(test)]
mod test;
struct QueryAtom {
kind: QueryAtomKind,
atom: String,
ignore_case: bool,
inverse: bool,
}
impl QueryAtom {
fn new(atom: &str) -> Option<QueryAtom> {
let mut atom = atom.to_string();
let inverse = atom.starts_with('!');
if inverse {
atom.remove(0);
}
let mut kind = match atom.chars().next() {
Some('^') => QueryAtomKind::Prefix,
Some('\'') => QueryAtomKind::Substring,
_ if inverse => QueryAtomKind::Substring,
_ => QueryAtomKind::Fuzzy,
};
if atom.starts_with(['^', '\'']) {
atom.remove(0);
}
if atom.is_empty() {
return None;
}
if atom.ends_with('$') && !atom.ends_with("\\$") {
atom.pop();
kind = if kind == QueryAtomKind::Prefix {
QueryAtomKind::Exact
} else {
QueryAtomKind::Postfix
}
}
Some(QueryAtom {
kind,
atom: atom.replace('\\', ""),
// not ideal but fuzzy_matches only knows ascii uppercase so more consistent
// to behave the same
ignore_case: kind != QueryAtomKind::Fuzzy
&& atom.chars().all(|c| c.is_ascii_lowercase()),
inverse,
})
}
fn indices(&self, matcher: &Matcher, item: &str, indices: &mut Vec<usize>) -> bool {
// for inverse there are no indices to return
// just return whether we matched
if self.inverse {
return self.matches(matcher, item);
}
let buf;
let item = if self.ignore_case {
buf = item.to_ascii_lowercase();
&buf
} else {
item
};
let off = match self.kind {
QueryAtomKind::Fuzzy => {
if let Some((_, fuzzy_indices)) = matcher.fuzzy_indices(item, &self.atom) {
indices.extend_from_slice(&fuzzy_indices);
return true;
} else {
return false;
}
}
QueryAtomKind::Substring => {
if let Some(off) = item.find(&self.atom) {
off
} else {
return false;
}
}
QueryAtomKind::Prefix if item.starts_with(&self.atom) => 0,
QueryAtomKind::Postfix if item.ends_with(&self.atom) => item.len() - self.atom.len(),
QueryAtomKind::Exact if item == self.atom => 0,
_ => return false,
};
indices.extend(off..(off + self.atom.len()));
true
}
fn matches(&self, matcher: &Matcher, item: &str) -> bool {
let buf;
let item = if self.ignore_case {
buf = item.to_ascii_lowercase();
&buf
} else {
item
};
let mut res = match self.kind {
QueryAtomKind::Fuzzy => matcher.fuzzy_match(item, &self.atom).is_some(),
QueryAtomKind::Substring => item.contains(&self.atom),
QueryAtomKind::Prefix => item.starts_with(&self.atom),
QueryAtomKind::Postfix => item.ends_with(&self.atom),
QueryAtomKind::Exact => item == self.atom,
};
if self.inverse {
res = !res;
}
res
}
}
#[derive(Debug, PartialEq, Eq, Clone, Copy)]
enum QueryAtomKind {
/// Item is a fuzzy match of this behaviour
///
/// Usage: `foo`
Fuzzy,
/// Item contains query atom as a continuous substring
///
/// Usage `'foo`
Substring,
/// Item starts with query atom
///
/// Usage: `^foo`
Prefix,
/// Item ends with query atom
///
/// Usage: `foo$`
Postfix,
/// Item is equal to query atom
///
/// Usage `^foo$`
Exact,
}
#[derive(Default)]
pub struct FuzzyQuery {
first_fuzzy_atom: Option<String>,
query_atoms: Vec<QueryAtom>,
}
fn query_atoms(query: &str) -> impl Iterator<Item = &str> + '_ {
let mut saw_backslash = false;
query.split(move |c| {
saw_backslash = match c {
' ' if !saw_backslash => return true,
'\\' => true,
_ => false,
};
false
})
}
impl FuzzyQuery {
pub fn refine(&self, query: &str, old_query: &str) -> (FuzzyQuery, bool) {
// TODO: we could be a lot smarter about this
let new_query = Self::new(query);
let mut is_refinement = query.starts_with(old_query);
// if the last atom is an inverse atom adding more text to it
// will actually increase the number of matches and we can not refine
// the matches.
if is_refinement && !self.query_atoms.is_empty() {
let last_idx = self.query_atoms.len() - 1;
if self.query_atoms[last_idx].inverse
&& self.query_atoms[last_idx].atom != new_query.query_atoms[last_idx].atom
{
is_refinement = false;
}
}
(new_query, is_refinement)
}
pub fn new(query: &str) -> FuzzyQuery {
let mut first_fuzzy_query = None;
let query_atoms = query_atoms(query)
.filter_map(|atom| {
let atom = QueryAtom::new(atom)?;
if atom.kind == QueryAtomKind::Fuzzy && first_fuzzy_query.is_none() {
first_fuzzy_query = Some(atom.atom);
None
} else {
Some(atom)
}
})
.collect();
FuzzyQuery {
first_fuzzy_atom: first_fuzzy_query,
query_atoms,
}
}
pub fn fuzzy_match(&self, item: &str, matcher: &Matcher) -> Option<i64> {
// use the rank of the first fuzzzy query for the rank, because merging ranks is not really possible
// this behaviour matches fzf and skim
let score = self
.first_fuzzy_atom
.as_ref()
.map_or(Some(0), |atom| matcher.fuzzy_match(item, atom))?;
if self
.query_atoms
.iter()
.any(|atom| !atom.matches(matcher, item))
{
return None;
}
Some(score)
}
pub fn fuzzy_indices(&self, item: &str, matcher: &Matcher) -> Option<(i64, Vec<usize>)> {
let (score, mut indices) = self.first_fuzzy_atom.as_ref().map_or_else(
|| Some((0, Vec::new())),
|atom| matcher.fuzzy_indices(item, atom),
)?;
// fast path for the common case of just a single atom
if self.query_atoms.is_empty() {
return Some((score, indices));
}
for atom in &self.query_atoms {
if !atom.indices(matcher, item, &mut indices) {
return None;
}
}
// deadup and remove duplicate matches
indices.sort_unstable();
indices.dedup();
Some((score, indices))
}
}
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