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Merge pull request #166 from meilisearch/split-query-words

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Split query words
This commit is contained in:
Clément Renault 2019-06-28 18:30:13 +02:00 committed by GitHub
commit 97cc3c7cce
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 240 additions and 161 deletions
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59
meilidb-core/src/automaton.rs
View File

@ -1,8 +1,7 @@
use fst::Automaton;
use lazy_static::lazy_static;
use levenshtein_automata::{
LevenshteinAutomatonBuilder as LevBuilder,
DFA, Distance,
DFA,
};
lazy_static! {
@ -11,55 +10,16 @@ lazy_static! {
static ref LEVDIST2: LevBuilder = LevBuilder::new(2, false);
}
pub struct DfaExt {
query_len: usize,
automaton: DFA,
}
impl Automaton for DfaExt {
type State = <DFA as Automaton>::State;
fn start(&self) -> Self::State {
self.automaton.start()
}
fn is_match(&self, state: &Self::State) -> bool {
self.automaton.is_match(state)
}
fn can_match(&self, state: &Self::State) -> bool {
self.automaton.can_match(state)
}
fn will_always_match(&self, state: &Self::State) -> bool {
self.automaton.will_always_match(state)
}
fn accept(&self, state: &Self::State, byte: u8) -> Self::State {
self.automaton.accept(state, byte)
}
}
impl AutomatonExt for DfaExt {
fn eval<B: AsRef<[u8]>>(&self, s: B) -> Distance {
self.automaton.eval(s)
}
fn query_len(&self) -> usize {
self.query_len
}
}
#[derive(Copy, Clone)]
enum PrefixSetting {
Prefix,
NoPrefix,
}
fn build_dfa_with_setting(query: &str, setting: PrefixSetting) -> DfaExt {
fn build_dfa_with_setting(query: &str, setting: PrefixSetting) -> DFA {
use self::PrefixSetting::{Prefix, NoPrefix};
let dfa = match query.len() {
match query.len() {
0 ..= 4 => match setting {
Prefix => LEVDIST0.build_prefix_dfa(query),
NoPrefix => LEVDIST0.build_dfa(query),
@ -72,20 +32,13 @@ fn build_dfa_with_setting(query: &str, setting: PrefixSetting) -> DfaExt {
Prefix => LEVDIST2.build_prefix_dfa(query),
NoPrefix => LEVDIST2.build_dfa(query),
},
};
DfaExt { query_len: query.len(), automaton: dfa }
}
}
pub fn build_prefix_dfa(query: &str) -> DfaExt {
pub fn build_prefix_dfa(query: &str) -> DFA {
build_dfa_with_setting(query, PrefixSetting::Prefix)
}
pub fn build_dfa(query: &str) -> DfaExt {
pub fn build_dfa(query: &str) -> DFA {
build_dfa_with_setting(query, PrefixSetting::NoPrefix)
}
pub trait AutomatonExt: Automaton {
fn eval<B: AsRef<[u8]>>(&self, s: B) -> Distance;
fn query_len(&self) -> usize;
}

342
meilidb-core/src/query_builder.rs
View File

@ -11,8 +11,9 @@ use meilidb_tokenizer::{is_cjk, split_query_string};
use rayon::slice::ParallelSliceMut;
use sdset::SetBuf;
use slice_group_by::GroupByMut;
use levenshtein_automata::DFA;
use crate::automaton::{DfaExt, AutomatonExt, build_dfa, build_prefix_dfa};
use crate::automaton::{build_dfa, build_prefix_dfa};
use crate::distinct_map::{DistinctMap, BufferedDistinctMap};
use crate::criterion::Criteria;
use crate::raw_documents_from_matches;
@ -21,18 +22,38 @@ use crate::{Match, DocumentId, Store, RawDocument, Document};
const NGRAMS: usize = 3;
struct Automaton {
index: usize,
query_index: usize,
query_len: usize,
is_exact: bool,
dfa: DfaExt,
dfa: DFA,
}
impl Automaton {
fn exact(index: usize, dfa: DfaExt) -> Automaton {
Automaton { index, is_exact: true, dfa }
fn exact(query_index: usize, query: &str) -> Automaton {
Automaton {
query_index,
query_len: query.len(),
is_exact: true,
dfa: build_dfa(query),
}
}
fn non_exact(index: usize, dfa: DfaExt) -> Automaton {
Automaton { index, is_exact: false, dfa }
fn prefix_exact(query_index: usize, query: &str) -> Automaton {
Automaton {
query_index,
query_len: query.len(),
is_exact: true,
dfa: build_prefix_dfa(query),
}
}
fn non_exact(query_index: usize, query: &str) -> Automaton {
Automaton {
query_index,
query_len: query.len(),
is_exact: false,
dfa: build_dfa(query),
}
}
}
@ -46,6 +67,29 @@ pub fn normalize_str(string: &str) -> String {
string
}
fn split_best_frequency<'a, S: Store>(
word: &'a str,
store: &S,
) -> Result<Option<(&'a str, &'a str)>, S::Error>
{
let chars = word.char_indices().skip(1);
let mut best = None;
for (i, _) in chars {
let (left, right) = word.split_at(i);
let left_freq = store.word_indexes(left.as_bytes())?.map_or(0, |i| i.len());
let right_freq = store.word_indexes(right.as_bytes())?.map_or(0, |i| i.len());
let min_freq = cmp::min(left_freq, right_freq);
if min_freq != 0 && best.map_or(true, |(old, _, _)| min_freq > old) {
best = Some((min_freq, left, right));
}
}
Ok(best.map(|(_, l, r)| (l, r)))
}
fn generate_automatons<S: Store>(query: &str, store: &S) -> Result<Vec<Automaton>, S::Error> {
let has_end_whitespace = query.chars().last().map_or(false, char::is_whitespace);
let query_words: Vec<_> = split_query_string(query).map(str::to_lowercase).collect();
@ -54,19 +98,12 @@ fn generate_automatons<S: Store>(query: &str, store: &S) -> Result<Vec<Automaton
let synonyms = store.synonyms()?;
for n in 1..=NGRAMS {
let mut index = 0;
let mut query_index = 0;
let mut ngrams = query_words.windows(n).peekable();
while let Some(ngram_slice) = ngrams.next() {
let ngram_nb_words = ngram_slice.len();
let ngram = ngram_slice.join(" ");
let concat = ngram_slice.concat();
// automaton of concatenation of query words
let normalized = normalize_str(&concat);
let lev = build_dfa(&normalized);
let automaton = Automaton::exact(index, lev);
automatons.push((automaton, normalized));
let has_following_word = ngrams.peek().is_some();
let not_prefix_dfa = has_following_word || has_end_whitespace || ngram.chars().all(is_cjk);
@ -92,11 +129,10 @@ fn generate_automatons<S: Store>(query: &str, store: &S) -> Result<Vec<Automaton
let nb_synonym_words = split_query_string(synonyms).count();
for synonym in split_query_string(synonyms) {
let lev = build_dfa(synonym);
let automaton = if nb_synonym_words == 1 {
Automaton::exact(index, lev)
Automaton::exact(query_index, synonym)
} else {
Automaton::non_exact(index, lev)
Automaton::non_exact(query_index, synonym)
};
automatons.push((automaton, synonym.to_owned()));
}
@ -105,22 +141,55 @@ fn generate_automatons<S: Store>(query: &str, store: &S) -> Result<Vec<Automaton
}
if n == 1 {
let lev = if not_prefix_dfa { build_dfa(&ngram) } else { build_prefix_dfa(&ngram) };
let automaton = Automaton::exact(index, lev);
// TODO we do not support "phrase query" in other words:
// first term *must* follow the second term
if let Some((left, right)) = split_best_frequency(&ngram, store)? {
let automaton = Automaton::exact(query_index, left);
automatons.push((automaton, left.to_owned()));
let automaton = Automaton::exact(query_index, right);
automatons.push((automaton, right.to_owned()));
}
let automaton = if not_prefix_dfa {
Automaton::exact(query_index, &ngram)
} else {
Automaton::prefix_exact(query_index, &ngram)
};
automatons.push((automaton, ngram));
} else {
// automaton of concatenation of query words
let concat = ngram_slice.concat();
let normalized = normalize_str(&concat);
let automaton = Automaton::exact(query_index, &normalized);
automatons.push((automaton, normalized));
}
index += 1;
query_index += 1;
}
}
automatons.sort_unstable_by(|a, b| (a.0.index, &a.1).cmp(&(b.0.index, &b.1)));
automatons.dedup_by(|a, b| (a.0.index, &a.1) == (b.0.index, &b.1));
automatons.sort_unstable_by(|a, b| (a.0.query_index, &a.1).cmp(&(b.0.query_index, &b.1)));
automatons.dedup_by(|a, b| (a.0.query_index, &a.1) == (b.0.query_index, &b.1));
let automatons = automatons.into_iter().map(|(a, _)| a).collect();
Ok(automatons)
}
fn rewrite_matched_positions(matches: &mut [(DocumentId, Match)]) {
for document_matches in matches.linear_group_by_mut(|(a, _), (b, _)| a == b) {
let mut offset = 0;
for query_indexes in document_matches.linear_group_by_mut(|(_, a), (_, b)| a.query_index == b.query_index) {
let word_index = query_indexes[0].1.word_index - offset as u16;
for (_, match_) in query_indexes.iter_mut() {
match_.word_index = word_index;
}
offset += query_indexes.len() - 1;
}
}
}
pub struct QueryBuilder<'c, S, FI = fn(DocumentId) -> bool> {
store: S,
criteria: Criteria<'c>,
@ -184,9 +253,9 @@ where S: Store,
while let Some((input, indexed_values)) = stream.next() {
for iv in indexed_values {
let Automaton { index, is_exact, ref dfa } = automatons[iv.index];
let Automaton { query_index, is_exact, query_len, ref dfa } = automatons[iv.index];
let distance = dfa.eval(input).to_u8();
let is_exact = is_exact && distance == 0 && input.len() == dfa.query_len();
let is_exact = is_exact && distance == 0 && input.len() == query_len;
let doc_indexes = self.store.word_indexes(input)?;
let doc_indexes = match doc_indexes {
@ -197,8 +266,8 @@ where S: Store,
for di in doc_indexes.as_slice() {
if self.searchable_attrs.as_ref().map_or(true, |r| r.contains(&di.attribute)) {
let match_ = Match {
query_index: index as u32,
distance: distance,
query_index: query_index as u32,
distance,
attribute: di.attribute,
word_index: di.word_index,
is_exact,
@ -206,23 +275,15 @@ where S: Store,
char_length: di.char_length,
};
matches.push((di.document_id, match_));
}
}
}
}
// rewrite the matched positions for next criteria evaluations
matches.par_sort_unstable();
for document_matches in matches.linear_group_by_mut(|(a, _), (b, _)| a == b) {
let mut offset = 0;
for query_indexes in document_matches.linear_group_by_mut(|(_, a), (_, b)| a.query_index == b.query_index) {
let word_index = query_indexes[0].1.word_index - offset as u16;
for (_, match_) in query_indexes.iter_mut() {
match_.word_index = word_index;
}
offset += query_indexes.len() - 1;
}
}
rewrite_matched_positions(&mut matches);
let total_matches = matches.len();
let padded_matches = SetBuf::from_dirty(matches);
@ -543,6 +604,28 @@ mod tests {
}
}
#[test]
fn simple() {
let store = InMemorySetStore::from_iter(vec![
("iphone", &[doc_char_index(0, 0, 0)][..]),
("from", &[doc_char_index(0, 1, 1)][..]),
("apple", &[doc_char_index(0, 2, 2)][..]),
]);
let builder = QueryBuilder::new(&store);
let results = builder.query("iphone from apple", 0..20).unwrap();
let mut iter = results.into_iter();
assert_matches!(iter.next(), Some(Document { id: DocumentId(0), matches }) => {
let mut matches = matches.into_iter();
assert_matches!(matches.next(), Some(Match { query_index: 0, word_index: 0, .. }));
assert_matches!(matches.next(), Some(Match { query_index: 1, word_index: 1, .. }));
assert_matches!(matches.next(), Some(Match { query_index: 2, word_index: 2, .. }));
assert_matches!(matches.next(), None);
});
assert_matches!(iter.next(), None);
}
#[test]
fn simple_synonyms() {
let mut store = InMemorySetStore::from_iter(vec![
@ -556,10 +639,9 @@ mod tests {
let mut iter = results.into_iter();
assert_matches!(iter.next(), Some(Document { id: DocumentId(0), matches }) => {
assert_eq!(matches.len(), 1);
let match_ = matches[0];
assert_eq!(match_.query_index, 0);
assert_eq!(match_.word_index, 0);
let mut matches = matches.into_iter();
assert_matches!(matches.next(), Some(Match { query_index: 0, word_index: 0, .. }));
assert_matches!(matches.next(), None);
});
assert_matches!(iter.next(), None);
@ -568,10 +650,9 @@ mod tests {
let mut iter = results.into_iter();
assert_matches!(iter.next(), Some(Document { id: DocumentId(0), matches }) => {
assert_eq!(matches.len(), 1);
let match_ = matches[0];
assert_eq!(match_.query_index, 0);
assert_eq!(match_.word_index, 0);
let mut matches = matches.into_iter();
assert_matches!(matches.next(), Some(Match { query_index: 0, word_index: 0, .. }));
assert_matches!(matches.next(), None);
});
assert_matches!(iter.next(), None);
}
@ -590,10 +671,9 @@ mod tests {
let mut iter = results.into_iter();
assert_matches!(iter.next(), Some(Document { id: DocumentId(0), matches }) => {
assert_eq!(matches.len(), 1);
let match_ = matches[0];
assert_eq!(match_.query_index, 0);
assert_eq!(match_.word_index, 0);
let mut matches = matches.into_iter();
assert_matches!(matches.next(), Some(Match { query_index: 0, word_index: 0, .. }));
assert_matches!(matches.next(), None);
});
assert_matches!(iter.next(), None);
@ -602,10 +682,9 @@ mod tests {
let mut iter = results.into_iter();
assert_matches!(iter.next(), Some(Document { id: DocumentId(0), matches }) => {
assert_eq!(matches.len(), 1);
let match_ = matches[0];
assert_eq!(match_.query_index, 0);
assert_eq!(match_.word_index, 0);
let mut matches = matches.into_iter();
assert_matches!(matches.next(), Some(Match { query_index: 0, word_index: 0, .. }));
assert_matches!(matches.next(), None);
});
assert_matches!(iter.next(), None);
@ -635,10 +714,9 @@ mod tests {
let mut iter = results.into_iter();
assert_matches!(iter.next(), Some(Document { id: DocumentId(0), matches }) => {
assert_eq!(matches.len(), 1);
let match_ = matches[0];
assert_eq!(match_.query_index, 0);
assert_eq!(match_.word_index, 0);
let mut matches = matches.into_iter();
assert_matches!(matches.next(), Some(Match { query_index: 0, word_index: 0, .. }));
assert_matches!(matches.next(), None);
});
assert_matches!(iter.next(), None);
@ -647,10 +725,9 @@ mod tests {
let mut iter = results.into_iter();
assert_matches!(iter.next(), Some(Document { id: DocumentId(0), matches }) => {
assert_eq!(matches.len(), 1);
let match_ = matches[0];
assert_eq!(match_.query_index, 0);
assert_eq!(match_.word_index, 0);
let mut matches = matches.into_iter();
assert_matches!(matches.next(), Some(Match { query_index: 0, word_index: 0, .. }));
assert_matches!(matches.next(), None);
});
assert_matches!(iter.next(), None);
}
@ -658,9 +735,9 @@ mod tests {
#[test]
fn harder_synonyms() {
let mut store = InMemorySetStore::from_iter(vec![
("hello", &[doc_index(0, 0)][..]),
("bonjour", &[doc_index(1, 3)]),
("salut", &[doc_index(2, 5)]),
("hello", &[doc_index(0, 0)][..]),
("bonjour", &[doc_index(1, 3)]),
("salut", &[doc_index(2, 5)]),
]);
store.add_synonym("hello", SetBuf::from_dirty(vec!["bonjour", "salut"]));
@ -672,22 +749,19 @@ mod tests {
let mut iter = results.into_iter();
assert_matches!(iter.next(), Some(Document { id: DocumentId(0), matches }) => {
assert_eq!(matches.len(), 1);
let match_ = matches[0];
assert_eq!(match_.query_index, 0);
assert_eq!(match_.word_index, 0);
let mut matches = matches.into_iter();
assert_matches!(matches.next(), Some(Match { query_index: 0, word_index: 0, .. }));
assert_matches!(matches.next(), None);
});
assert_matches!(iter.next(), Some(Document { id: DocumentId(1), matches }) => {
assert_eq!(matches.len(), 1);
let match_ = matches[0];
assert_eq!(match_.query_index, 0);
assert_eq!(match_.word_index, 3);
let mut matches = matches.into_iter();
assert_matches!(matches.next(), Some(Match { query_index: 0, word_index: 3, .. }));
assert_matches!(matches.next(), None);
});
assert_matches!(iter.next(), Some(Document { id: DocumentId(2), matches }) => {
assert_eq!(matches.len(), 1);
let match_ = matches[0];
assert_eq!(match_.query_index, 0);
assert_eq!(match_.word_index, 5);
let mut matches = matches.into_iter();
assert_matches!(matches.next(), Some(Match { query_index: 0, word_index: 5, .. }));
assert_matches!(matches.next(), None);
});
assert_matches!(iter.next(), None);
@ -696,22 +770,19 @@ mod tests {
let mut iter = results.into_iter();
assert_matches!(iter.next(), Some(Document { id: DocumentId(0), matches }) => {
assert_eq!(matches.len(), 1);
let match_ = matches[0];
assert_eq!(match_.query_index, 0);
assert_eq!(match_.word_index, 0);
let mut matches = matches.into_iter();
assert_matches!(matches.next(), Some(Match { query_index: 0, word_index: 0, .. }));
assert_matches!(matches.next(), None);
});
assert_matches!(iter.next(), Some(Document { id: DocumentId(1), matches }) => {
assert_eq!(matches.len(), 1);
let match_ = matches[0];
assert_eq!(match_.query_index, 0);
assert_eq!(match_.word_index, 3);
let mut matches = matches.into_iter();
assert_matches!(matches.next(), Some(Match { query_index: 0, word_index: 3, .. }));
assert_matches!(matches.next(), None);
});
assert_matches!(iter.next(), Some(Document { id: DocumentId(2), matches }) => {
assert_eq!(matches.len(), 1);
let match_ = matches[0];
assert_eq!(match_.query_index, 0);
assert_eq!(match_.word_index, 5);
let mut matches = matches.into_iter();
assert_matches!(matches.next(), Some(Match { query_index: 0, word_index: 5, .. }));
assert_matches!(matches.next(), None);
});
assert_matches!(iter.next(), None);
@ -720,22 +791,19 @@ mod tests {
let mut iter = results.into_iter();
assert_matches!(iter.next(), Some(Document { id: DocumentId(0), matches }) => {
assert_eq!(matches.len(), 1);
let match_ = matches[0];
assert_eq!(match_.query_index, 0);
assert_eq!(match_.word_index, 0);
let mut matches = matches.into_iter();
assert_matches!(matches.next(), Some(Match { query_index: 0, word_index: 0, .. }));
assert_matches!(matches.next(), None);
});
assert_matches!(iter.next(), Some(Document { id: DocumentId(1), matches }) => {
assert_eq!(matches.len(), 1);
let match_ = matches[0];
assert_eq!(match_.query_index, 0);
assert_eq!(match_.word_index, 3);
let mut matches = matches.into_iter();
assert_matches!(matches.next(), Some(Match { query_index: 0, word_index: 3, .. }));
assert_matches!(matches.next(), None);
});
assert_matches!(iter.next(), Some(Document { id: DocumentId(2), matches }) => {
assert_eq!(matches.len(), 1);
let match_ = matches[0];
assert_eq!(match_.query_index, 0);
assert_eq!(match_.word_index, 5);
let mut matches = matches.into_iter();
assert_matches!(matches.next(), Some(Match { query_index: 0, word_index: 5, .. }));
assert_matches!(matches.next(), None);
});
assert_matches!(iter.next(), None);
}
@ -744,12 +812,12 @@ mod tests {
/// Unique word has multi-word synonyms
fn unique_to_multiword_synonyms() {
let mut store = InMemorySetStore::from_iter(vec![
("new", &[doc_char_index(0, 0, 0)][..]),
("york", &[doc_char_index(0, 1, 1)][..]),
("city", &[doc_char_index(0, 2, 2)][..]),
("new", &[doc_char_index(0, 0, 0)][..]),
("york", &[doc_char_index(0, 1, 1)][..]),
("city", &[doc_char_index(0, 2, 2)][..]),
("subway", &[doc_char_index(0, 3, 3)][..]),
("NY", &[doc_char_index(1, 0, 0)][..]),
("NY", &[doc_char_index(1, 0, 0)][..]),
("subway", &[doc_char_index(1, 1, 1)][..]),
]);
@ -933,6 +1001,12 @@ mod tests {
("blue", &[doc_char_index(1, 1, 1)][..]),
("subway", &[doc_char_index(1, 2, 2)][..]),
("broken", &[doc_char_index(1, 3, 3)][..]),
("new", &[doc_char_index(2, 0, 0)][..]),
("york", &[doc_char_index(2, 1, 1)][..]),
("underground", &[doc_char_index(2, 2, 2)][..]),
("train", &[doc_char_index(2, 3, 3)][..]),
("broken", &[doc_char_index(2, 4, 4)][..]),
]);
store.add_synonym("new york", SetBuf::from_dirty(vec!["NYC", "NY", "new york city"]));
@ -943,6 +1017,16 @@ mod tests {
let results = builder.query("new york underground train broken", 0..20).unwrap();
let mut iter = results.into_iter();
assert_matches!(iter.next(), Some(Document { id: DocumentId(2), matches }) => {
let mut iter = matches.into_iter();
assert_matches!(iter.next(), Some(Match { query_index: 0, word_index: 0, char_index: 1, .. })); // york
assert_matches!(iter.next(), Some(Match { query_index: 0, word_index: 0, char_index: 0, .. })); // new
assert_matches!(iter.next(), Some(Match { query_index: 1, word_index: 0, char_index: 1, .. })); // york
assert_matches!(iter.next(), Some(Match { query_index: 2, word_index: 1, char_index: 2, .. })); // underground
assert_matches!(iter.next(), Some(Match { query_index: 3, word_index: 2, char_index: 3, .. })); // train
assert_matches!(iter.next(), Some(Match { query_index: 4, word_index: 3, char_index: 4, .. })); // broken
assert_matches!(iter.next(), None);
});
assert_matches!(iter.next(), Some(Document { id: DocumentId(1), matches }) => {
let mut iter = matches.into_iter();
assert_matches!(iter.next(), Some(Match { query_index: 0, word_index: 0, .. })); // NYC = new york
@ -962,6 +1046,16 @@ mod tests {
let results = builder.query("new york city underground train broken", 0..20).unwrap();
let mut iter = results.into_iter();
assert_matches!(iter.next(), Some(Document { id: DocumentId(2), matches }) => {
let mut iter = matches.into_iter();
assert_matches!(iter.next(), Some(Match { query_index: 0, word_index: 0, char_index: 1, .. })); // york
assert_matches!(iter.next(), Some(Match { query_index: 0, word_index: 0, char_index: 0, .. })); // new
assert_matches!(iter.next(), Some(Match { query_index: 1, word_index: 0, char_index: 1, .. })); // york
assert_matches!(iter.next(), Some(Match { query_index: 3, word_index: 1, char_index: 2, .. })); // underground
assert_matches!(iter.next(), Some(Match { query_index: 4, word_index: 2, char_index: 3, .. })); // train
assert_matches!(iter.next(), Some(Match { query_index: 5, word_index: 3, char_index: 4, .. })); // broken
assert_matches!(iter.next(), None);
});
assert_matches!(iter.next(), Some(Document { id: DocumentId(1), matches }) => {
let mut iter = matches.into_iter();
assert_matches!(iter.next(), Some(Match { query_index: 0, word_index: 0, .. })); // NYC = new york city
@ -1033,9 +1127,7 @@ mod tests {
});
assert_matches!(iter.next(), Some(Document { id: DocumentId(1), matches }) => {
let mut iter = matches.into_iter();
assert_matches!(iter.next(), Some(Match { query_index: 0, distance: 0, .. })); // téléphone
assert_matches!(iter.next(), Some(Match { query_index: 0, distance: 1, .. })); // telephone
assert_matches!(iter.next(), Some(Match { query_index: 0, distance: 2, .. })); // télephone
assert_matches!(iter.next(), Some(Match { query_index: 0, distance: 1, .. })); // téléphone
assert_matches!(iter.next(), None);
});
assert_matches!(iter.next(), None);
@ -1061,4 +1153,38 @@ mod tests {
});
assert_matches!(iter.next(), None);
}
#[test]
fn simple_split() {
let store = InMemorySetStore::from_iter(vec![
("porte", &[doc_char_index(0, 0, 0)][..]),
("feuille", &[doc_char_index(0, 1, 1)][..]),
("search", &[doc_char_index(1, 0, 0)][..]),
("engine", &[doc_char_index(1, 1, 1)][..]),
]);
let builder = QueryBuilder::new(&store);
let results = builder.query("portefeuille", 0..20).unwrap();
let mut iter = results.into_iter();
assert_matches!(iter.next(), Some(Document { id: DocumentId(0), matches }) => {
let mut iter = matches.into_iter();
assert_matches!(iter.next(), Some(Match { query_index: 0, word_index: 0, char_index: 0, .. })); // porte
assert_matches!(iter.next(), Some(Match { query_index: 0, word_index: 0, char_index: 1, .. })); // feuille
assert_matches!(iter.next(), None);
});
assert_matches!(iter.next(), None);
let builder = QueryBuilder::new(&store);
let results = builder.query("searchengine", 0..20).unwrap();
let mut iter = results.into_iter();
assert_matches!(iter.next(), Some(Document { id: DocumentId(1), matches }) => {
let mut iter = matches.into_iter();
assert_matches!(iter.next(), Some(Match { query_index: 0, word_index: 0, char_index: 0, .. })); // search
assert_matches!(iter.next(), Some(Match { query_index: 0, word_index: 0, char_index: 1, .. })); // engine
assert_matches!(iter.next(), None);
});
assert_matches!(iter.next(), None);
}
}