use std::{cmp, fmt, mem}; use fst::Set; use meilisearch_tokenizer::token::SeparatorKind; use meilisearch_tokenizer::tokenizer::TokenStream; use meilisearch_tokenizer::TokenKind; use roaring::RoaringBitmap; use slice_group_by::GroupBy; use crate::{Index, Result}; type IsOptionalWord = bool; type IsPrefix = bool; #[derive(Clone, PartialEq, Eq, Hash)] pub enum Operation { And(Vec), // serie of consecutive non prefix and exact words Phrase(Vec), Or(IsOptionalWord, Vec), Query(Query), } impl fmt::Debug for Operation { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { fn pprint_tree(f: &mut fmt::Formatter<'_>, op: &Operation, depth: usize) -> fmt::Result { match op { Operation::And(children) => { writeln!(f, "{:1$}AND", "", depth * 2)?; children.iter().try_for_each(|c| pprint_tree(f, c, depth + 1)) } Operation::Phrase(children) => { writeln!(f, "{:2$}PHRASE {:?}", "", children, depth * 2) } Operation::Or(true, children) => { writeln!(f, "{:1$}OR(WORD)", "", depth * 2)?; children.iter().try_for_each(|c| pprint_tree(f, c, depth + 1)) } Operation::Or(false, children) => { writeln!(f, "{:1$}OR", "", depth * 2)?; children.iter().try_for_each(|c| pprint_tree(f, c, depth + 1)) } Operation::Query(query) => writeln!(f, "{:2$}{:?}", "", query, depth * 2), } } pprint_tree(f, self, 0) } } impl Operation { fn and(mut ops: Vec) -> Self { if ops.len() == 1 { ops.pop().unwrap() } else { Self::And(ops) } } pub fn or(word_branch: IsOptionalWord, mut ops: Vec) -> Self { if ops.len() == 1 { ops.pop().unwrap() } else { Self::Or(word_branch, ops) } } fn phrase(mut words: Vec) -> Self { if words.len() == 1 { Self::Query(Query { prefix: false, kind: QueryKind::exact(words.pop().unwrap()) }) } else { Self::Phrase(words) } } pub fn query(&self) -> Option<&Query> { match self { Operation::Query(query) => Some(query), _ => None, } } } #[derive(Clone, Eq, PartialEq, Hash)] pub struct Query { pub prefix: IsPrefix, pub kind: QueryKind, } #[derive(Debug, Clone, PartialEq, Eq, Hash)] pub enum QueryKind { Tolerant { typo: u8, word: String }, Exact { original_typo: u8, word: String }, } impl QueryKind { pub fn exact(word: String) -> Self { QueryKind::Exact { original_typo: 0, word } } pub fn exact_with_typo(original_typo: u8, word: String) -> Self { QueryKind::Exact { original_typo, word } } pub fn tolerant(typo: u8, word: String) -> Self { QueryKind::Tolerant { typo, word } } pub fn is_tolerant(&self) -> bool { matches!(self, QueryKind::Tolerant { .. }) } pub fn is_exact(&self) -> bool { matches!(self, QueryKind::Exact { .. }) } pub fn typo(&self) -> u8 { match self { QueryKind::Tolerant { typo, .. } => *typo, QueryKind::Exact { original_typo, .. } => *original_typo, } } pub fn word(&self) -> &str { match self { QueryKind::Tolerant { word, .. } => word, QueryKind::Exact { word, .. } => word, } } } impl fmt::Debug for Query { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { let Query { prefix, kind } = self; let prefix = if *prefix { String::from("Prefix") } else { String::default() }; match kind { QueryKind::Exact { word, .. } => { f.debug_struct(&(prefix + "Exact")).field("word", &word).finish() } QueryKind::Tolerant { typo, word } => f .debug_struct(&(prefix + "Tolerant")) .field("word", &word) .field("max typo", &typo) .finish(), } } } trait Context { fn word_docids(&self, word: &str) -> heed::Result>; fn synonyms>(&self, words: &[S]) -> heed::Result>>>; fn word_documents_count(&self, word: &str) -> heed::Result> { match self.word_docids(word)? { Some(rb) => Ok(Some(rb.len())), None => Ok(None), } } } /// The query tree builder is the interface to build a query tree. pub struct QueryTreeBuilder<'a> { rtxn: &'a heed::RoTxn<'a>, index: &'a Index, optional_words: bool, authorize_typos: bool, words_limit: Option, } impl<'a> Context for QueryTreeBuilder<'a> { fn word_docids(&self, word: &str) -> heed::Result> { self.index.word_docids.get(self.rtxn, word) } fn synonyms>(&self, words: &[S]) -> heed::Result>>> { self.index.words_synonyms(self.rtxn, words) } fn word_documents_count(&self, word: &str) -> heed::Result> { self.index.word_documents_count(self.rtxn, word) } } impl<'a> QueryTreeBuilder<'a> { /// Create a `QueryTreeBuilder` from a heed ReadOnly transaction `rtxn` /// and an Index `index`. pub fn new(rtxn: &'a heed::RoTxn<'a>, index: &'a Index) -> Self { Self { rtxn, index, optional_words: true, authorize_typos: true, words_limit: None } } /// if `optional_words` is set to `false` the query tree will be /// generated forcing all query words to be present in each matching documents /// (the criterion `words` will be ignored). /// default value if not called: `true` #[allow(unused)] pub fn optional_words(&mut self, optional_words: bool) -> &mut Self { self.optional_words = optional_words; self } /// if `authorize_typos` is set to `false` the query tree will be generated /// forcing all query words to match documents without any typo /// (the criterion `typo` will be ignored). /// default value if not called: `true` #[allow(unused)] pub fn authorize_typos(&mut self, authorize_typos: bool) -> &mut Self { self.authorize_typos = authorize_typos; self } /// Limit words and phrases that will be taken for query building. /// Any beyond `words_limit` will be ignored. pub fn words_limit(&mut self, words_limit: usize) -> &mut Self { self.words_limit = Some(words_limit); self } /// Build the query tree: /// - if `optional_words` is set to `false` the query tree will be /// generated forcing all query words to be present in each matching documents /// (the criterion `words` will be ignored) /// - if `authorize_typos` is set to `false` the query tree will be generated /// forcing all query words to match documents without any typo /// (the criterion `typo` will be ignored) pub fn build(&self, query: TokenStream) -> Result> { let stop_words = self.index.stop_words(self.rtxn)?; let primitive_query = create_primitive_query(query, stop_words, self.words_limit); if !primitive_query.is_empty() { let qt = create_query_tree( self, self.optional_words, self.authorize_typos, &primitive_query, )?; Ok(Some((qt, primitive_query))) } else { Ok(None) } } } /// Split the word depending on the frequency of subwords in the database documents. fn split_best_frequency(ctx: &impl Context, word: &str) -> heed::Result> { 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 = ctx.word_documents_count(left)?.unwrap_or(0); let right_freq = ctx.word_documents_count(right)?.unwrap_or(0); 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(|(_, left, right)| Operation::Phrase(vec![left.to_string(), right.to_string()]))) } /// Return the `QueryKind` of a word depending on `authorize_typos` /// and the provided word length. fn typos(word: String, authorize_typos: bool) -> QueryKind { if authorize_typos { match word.chars().count() { 0..=4 => QueryKind::exact(word), 5..=8 => QueryKind::tolerant(1, word), _ => QueryKind::tolerant(2, word), } } else { QueryKind::exact(word) } } /// Fetch synonyms from the `Context` for the provided word /// and create the list of operations for the query tree fn synonyms(ctx: &impl Context, word: &[&str]) -> heed::Result>> { let synonyms = ctx.synonyms(word)?; Ok(synonyms.map(|synonyms| { synonyms .into_iter() .map(|synonym| { let words = synonym .into_iter() .map(|word| { Operation::Query(Query { prefix: false, kind: QueryKind::exact(word) }) }) .collect(); Operation::and(words) }) .collect() })) } /// Main function that creates the final query tree from the primitive query. fn create_query_tree( ctx: &impl Context, optional_words: bool, authorize_typos: bool, query: &[PrimitiveQueryPart], ) -> Result { /// Matches on the `PrimitiveQueryPart` and create an operation from it. fn resolve_primitive_part( ctx: &impl Context, authorize_typos: bool, part: PrimitiveQueryPart, ) -> Result { match part { // 1. try to split word in 2 // 2. try to fetch synonyms // 3. create an operation containing the word // 4. wrap all in an OR operation PrimitiveQueryPart::Word(word, prefix) => { let mut children = synonyms(ctx, &[&word])?.unwrap_or_default(); if let Some(child) = split_best_frequency(ctx, &word)? { children.push(child); } children .push(Operation::Query(Query { prefix, kind: typos(word, authorize_typos) })); Ok(Operation::or(false, children)) } // create a CONSECUTIVE operation wrapping all word in the phrase PrimitiveQueryPart::Phrase(words) => Ok(Operation::phrase(words)), } } /// Create all ngrams 1..=3 generating query tree branches. fn ngrams( ctx: &impl Context, authorize_typos: bool, query: &[PrimitiveQueryPart], ) -> Result { const MAX_NGRAM: usize = 3; let mut op_children = Vec::new(); for sub_query in query.linear_group_by(|a, b| !(a.is_phrase() || b.is_phrase())) { let mut or_op_children = Vec::new(); for ngram in 1..=MAX_NGRAM.min(sub_query.len()) { if let Some(group) = sub_query.get(..ngram) { let mut and_op_children = Vec::new(); let tail = &sub_query[ngram..]; let is_last = tail.is_empty(); match group { [part] => { let operation = resolve_primitive_part(ctx, authorize_typos, part.clone())?; and_op_children.push(operation); } words => { let is_prefix = words.last().map_or(false, |part| part.is_prefix()); let words: Vec<_> = words .iter() .filter_map(|part| { if let PrimitiveQueryPart::Word(word, _) = part { Some(word.as_str()) } else { None } }) .collect(); let mut operations = synonyms(ctx, &words)?.unwrap_or_default(); let concat = words.concat(); let query = Query { prefix: is_prefix, kind: typos(concat, authorize_typos) }; operations.push(Operation::Query(query)); and_op_children.push(Operation::or(false, operations)); } } if !is_last { let ngrams = ngrams(ctx, authorize_typos, tail)?; and_op_children.push(ngrams); } or_op_children.push(Operation::and(and_op_children)); } } op_children.push(Operation::or(false, or_op_children)); } Ok(Operation::and(op_children)) } /// Create a new branch removing the last non-phrase query parts. fn optional_word( ctx: &impl Context, authorize_typos: bool, query: PrimitiveQuery, ) -> Result { let number_phrases = query.iter().filter(|p| p.is_phrase()).count(); let mut operation_children = Vec::new(); let start = number_phrases + (number_phrases == 0) as usize; for len in start..=query.len() { let mut word_count = len - number_phrases; let query: Vec<_> = query .iter() .filter(|p| { if p.is_phrase() { true } else if word_count != 0 { word_count -= 1; true } else { false } }) .cloned() .collect(); let ngrams = ngrams(ctx, authorize_typos, &query)?; operation_children.push(ngrams); } Ok(Operation::or(true, operation_children)) } if optional_words { optional_word(ctx, authorize_typos, query.to_vec()) } else { ngrams(ctx, authorize_typos, query) } } pub type PrimitiveQuery = Vec; #[derive(Debug, Clone)] pub enum PrimitiveQueryPart { Phrase(Vec), Word(String, IsPrefix), } impl PrimitiveQueryPart { fn is_phrase(&self) -> bool { matches!(self, Self::Phrase(_)) } fn is_prefix(&self) -> bool { matches!(self, Self::Word(_, is_prefix) if *is_prefix) } } /// Create primitive query from tokenized query string, /// the primitive query is an intermediate state to build the query tree. fn create_primitive_query( query: TokenStream, stop_words: Option>, words_limit: Option, ) -> PrimitiveQuery { let mut primitive_query = Vec::new(); let mut phrase = Vec::new(); let mut quoted = false; let parts_limit = words_limit.unwrap_or(usize::MAX); let mut peekable = query.peekable(); while let Some(token) = peekable.next() { // early return if word limit is exceeded if primitive_query.len() >= parts_limit { return primitive_query; } match token.kind { TokenKind::Word | TokenKind::StopWord => { // 1. if the word is quoted we push it in a phrase-buffer waiting for the ending quote, // 2. if the word is not the last token of the query and is not a stop_word we push it as a non-prefix word, // 3. if the word is the last token of the query we push it as a prefix word. if quoted { phrase.push(token.word.to_string()); } else if peekable.peek().is_some() { if !stop_words .as_ref() .map_or(false, |swords| swords.contains(token.word.as_ref())) { primitive_query .push(PrimitiveQueryPart::Word(token.word.to_string(), false)); } } else { primitive_query.push(PrimitiveQueryPart::Word(token.word.to_string(), true)); } } TokenKind::Separator(separator_kind) => { let quote_count = token.word.chars().filter(|&s| s == '"').count(); // swap quoted state if we encounter a double quote if quote_count % 2 != 0 { quoted = !quoted; } // if there is a quote or a hard separator we close the phrase. if !phrase.is_empty() && (quote_count > 0 || separator_kind == SeparatorKind::Hard) { primitive_query.push(PrimitiveQueryPart::Phrase(mem::take(&mut phrase))); } } _ => (), } } // If a quote is never closed, we consider all of the end of the query as a phrase. if !phrase.is_empty() { primitive_query.push(PrimitiveQueryPart::Phrase(mem::take(&mut phrase))); } primitive_query } /// Returns the maximum number of typos that this Operation allows. pub fn maximum_typo(operation: &Operation) -> usize { use Operation::{And, Or, Phrase, Query}; match operation { Or(_, ops) => ops.iter().map(maximum_typo).max().unwrap_or(0), And(ops) => ops.iter().map(maximum_typo).sum::(), Query(q) => q.kind.typo() as usize, // no typo allowed in phrases Phrase(_) => 0, } } /// Returns the maximum proximity that this Operation allows. pub fn maximum_proximity(operation: &Operation) -> usize { use Operation::{And, Or, Phrase, Query}; match operation { Or(_, ops) => ops.iter().map(maximum_proximity).max().unwrap_or(0), And(ops) => { ops.iter().map(maximum_proximity).sum::() + ops.len().saturating_sub(1) * 7 } Query(_) | Phrase(_) => 0, } } #[cfg(test)] mod test { use std::collections::HashMap; use maplit::hashmap; use meilisearch_tokenizer::{Analyzer, AnalyzerConfig}; use rand::rngs::StdRng; use rand::{Rng, SeedableRng}; use super::*; #[derive(Debug)] struct TestContext { synonyms: HashMap, Vec>>, postings: HashMap, } impl TestContext { fn build( &self, optional_words: bool, authorize_typos: bool, words_limit: Option, query: TokenStream, ) -> Result> { let primitive_query = create_primitive_query(query, None, words_limit); if !primitive_query.is_empty() { let qt = create_query_tree(self, optional_words, authorize_typos, &primitive_query)?; Ok(Some((qt, primitive_query))) } else { Ok(None) } } } impl Context for TestContext { fn word_docids(&self, word: &str) -> heed::Result> { Ok(self.postings.get(word).cloned()) } fn synonyms>(&self, words: &[S]) -> heed::Result>>> { let words: Vec<_> = words.iter().map(|s| s.as_ref().to_owned()).collect(); Ok(self.synonyms.get(&words).cloned()) } } impl Default for TestContext { fn default() -> TestContext { let mut rng = StdRng::seed_from_u64(102); let rng = &mut rng; fn random_postings(rng: &mut R, len: usize) -> RoaringBitmap { let mut values = Vec::::with_capacity(len); while values.len() != len { values.push(rng.gen()); } values.sort_unstable(); RoaringBitmap::from_sorted_iter(values.into_iter()) } TestContext { synonyms: hashmap! { vec![String::from("hello")] => vec![ vec![String::from("hi")], vec![String::from("good"), String::from("morning")], ], vec![String::from("world")] => vec![ vec![String::from("earth")], vec![String::from("nature")], ], // new york city vec![String::from("nyc")] => vec![ vec![String::from("new"), String::from("york")], vec![String::from("new"), String::from("york"), String::from("city")], ], vec![String::from("new"), String::from("york")] => vec![ vec![String::from("nyc")], vec![String::from("new"), String::from("york"), String::from("city")], ], vec![String::from("new"), String::from("york"), String::from("city")] => vec![ vec![String::from("nyc")], vec![String::from("new"), String::from("york")], ], }, postings: hashmap! { String::from("hello") => random_postings(rng, 1500), String::from("hi") => random_postings(rng, 4000), String::from("word") => random_postings(rng, 2500), String::from("split") => random_postings(rng, 400), String::from("ngrams") => random_postings(rng, 1400), String::from("world") => random_postings(rng, 15_000), String::from("earth") => random_postings(rng, 8000), String::from("2021") => random_postings(rng, 100), String::from("2020") => random_postings(rng, 500), String::from("is") => random_postings(rng, 50_000), String::from("this") => random_postings(rng, 50_000), String::from("good") => random_postings(rng, 1250), String::from("morning") => random_postings(rng, 125), }, } } } #[test] fn prefix() { let query = "hey friends"; let analyzer = Analyzer::new(AnalyzerConfig::>::default()); let result = analyzer.analyze(query); let tokens = result.tokens(); let expected = Operation::Or( false, vec![ Operation::And(vec![ Operation::Query(Query { prefix: false, kind: QueryKind::exact("hey".to_string()), }), Operation::Query(Query { prefix: true, kind: QueryKind::tolerant(1, "friends".to_string()), }), ]), Operation::Query(Query { prefix: true, kind: QueryKind::tolerant(2, "heyfriends".to_string()), }), ], ); let (query_tree, _) = TestContext::default().build(false, true, None, tokens).unwrap().unwrap(); assert_eq!(expected, query_tree); } #[test] fn no_prefix() { let query = "hey friends "; let analyzer = Analyzer::new(AnalyzerConfig::>::default()); let result = analyzer.analyze(query); let tokens = result.tokens(); let expected = Operation::Or( false, vec![ Operation::And(vec![ Operation::Query(Query { prefix: false, kind: QueryKind::exact("hey".to_string()), }), Operation::Query(Query { prefix: false, kind: QueryKind::tolerant(1, "friends".to_string()), }), ]), Operation::Query(Query { prefix: false, kind: QueryKind::tolerant(2, "heyfriends".to_string()), }), ], ); let (query_tree, _) = TestContext::default().build(false, true, None, tokens).unwrap().unwrap(); assert_eq!(expected, query_tree); } #[test] fn synonyms() { let query = "hello world "; let analyzer = Analyzer::new(AnalyzerConfig::>::default()); let result = analyzer.analyze(query); let tokens = result.tokens(); let expected = Operation::Or( false, vec![ Operation::And(vec![ Operation::Or( false, vec![ Operation::Query(Query { prefix: false, kind: QueryKind::exact("hi".to_string()), }), Operation::And(vec![ Operation::Query(Query { prefix: false, kind: QueryKind::exact("good".to_string()), }), Operation::Query(Query { prefix: false, kind: QueryKind::exact("morning".to_string()), }), ]), Operation::Query(Query { prefix: false, kind: QueryKind::tolerant(1, "hello".to_string()), }), ], ), Operation::Or( false, vec![ Operation::Query(Query { prefix: false, kind: QueryKind::exact("earth".to_string()), }), Operation::Query(Query { prefix: false, kind: QueryKind::exact("nature".to_string()), }), Operation::Query(Query { prefix: false, kind: QueryKind::tolerant(1, "world".to_string()), }), ], ), ]), Operation::Query(Query { prefix: false, kind: QueryKind::tolerant(2, "helloworld".to_string()), }), ], ); let (query_tree, _) = TestContext::default().build(false, true, None, tokens).unwrap().unwrap(); assert_eq!(expected, query_tree); } #[test] fn complex_synonyms() { let query = "new york city "; let analyzer = Analyzer::new(AnalyzerConfig::>::default()); let result = analyzer.analyze(query); let tokens = result.tokens(); let expected = Operation::Or( false, vec![ Operation::And(vec![ Operation::Query(Query { prefix: false, kind: QueryKind::exact("new".to_string()), }), Operation::Or( false, vec![ Operation::And(vec![ Operation::Query(Query { prefix: false, kind: QueryKind::exact("york".to_string()), }), Operation::Query(Query { prefix: false, kind: QueryKind::exact("city".to_string()), }), ]), Operation::Query(Query { prefix: false, kind: QueryKind::tolerant(1, "yorkcity".to_string()), }), ], ), ]), Operation::And(vec![ Operation::Or( false, vec![ Operation::Query(Query { prefix: false, kind: QueryKind::exact("nyc".to_string()), }), Operation::And(vec![ Operation::Query(Query { prefix: false, kind: QueryKind::exact("new".to_string()), }), Operation::Query(Query { prefix: false, kind: QueryKind::exact("york".to_string()), }), Operation::Query(Query { prefix: false, kind: QueryKind::exact("city".to_string()), }), ]), Operation::Query(Query { prefix: false, kind: QueryKind::tolerant(1, "newyork".to_string()), }), ], ), Operation::Query(Query { prefix: false, kind: QueryKind::exact("city".to_string()), }), ]), Operation::Or( false, vec![ Operation::Query(Query { prefix: false, kind: QueryKind::exact("nyc".to_string()), }), Operation::And(vec![ Operation::Query(Query { prefix: false, kind: QueryKind::exact("new".to_string()), }), Operation::Query(Query { prefix: false, kind: QueryKind::exact("york".to_string()), }), ]), Operation::Query(Query { prefix: false, kind: QueryKind::tolerant(2, "newyorkcity".to_string()), }), ], ), ], ); let (query_tree, _) = TestContext::default().build(false, true, None, tokens).unwrap().unwrap(); assert_eq!(expected, query_tree); } #[test] fn ngrams() { let query = "n grams "; let analyzer = Analyzer::new(AnalyzerConfig::>::default()); let result = analyzer.analyze(query); let tokens = result.tokens(); let expected = Operation::Or( false, vec![ Operation::And(vec![ Operation::Query(Query { prefix: false, kind: QueryKind::exact("n".to_string()), }), Operation::Query(Query { prefix: false, kind: QueryKind::tolerant(1, "grams".to_string()), }), ]), Operation::Query(Query { prefix: false, kind: QueryKind::tolerant(1, "ngrams".to_string()), }), ], ); let (query_tree, _) = TestContext::default().build(false, true, None, tokens).unwrap().unwrap(); assert_eq!(expected, query_tree); } #[test] fn word_split() { let query = "wordsplit fish "; let analyzer = Analyzer::new(AnalyzerConfig::>::default()); let result = analyzer.analyze(query); let tokens = result.tokens(); let expected = Operation::Or( false, vec![ Operation::And(vec![ Operation::Or( false, vec![ Operation::Phrase(vec!["word".to_string(), "split".to_string()]), Operation::Query(Query { prefix: false, kind: QueryKind::tolerant(2, "wordsplit".to_string()), }), ], ), Operation::Query(Query { prefix: false, kind: QueryKind::exact("fish".to_string()), }), ]), Operation::Query(Query { prefix: false, kind: QueryKind::tolerant(2, "wordsplitfish".to_string()), }), ], ); let (query_tree, _) = TestContext::default().build(false, true, None, tokens).unwrap().unwrap(); assert_eq!(expected, query_tree); } #[test] fn phrase() { let query = "\"hey friends\" \" \" \"wooop"; let analyzer = Analyzer::new(AnalyzerConfig::>::default()); let result = analyzer.analyze(query); let tokens = result.tokens(); let expected = Operation::And(vec![ Operation::Phrase(vec!["hey".to_string(), "friends".to_string()]), Operation::Query(Query { prefix: false, kind: QueryKind::exact("wooop".to_string()) }), ]); let (query_tree, _) = TestContext::default().build(false, true, None, tokens).unwrap().unwrap(); assert_eq!(expected, query_tree); } #[test] fn phrase_with_hard_separator() { let query = "\"hey friends. wooop wooop\""; let analyzer = Analyzer::new(AnalyzerConfig::>::default()); let result = analyzer.analyze(query); let tokens = result.tokens(); let expected = Operation::And(vec![ Operation::Phrase(vec!["hey".to_string(), "friends".to_string()]), Operation::Phrase(vec!["wooop".to_string(), "wooop".to_string()]), ]); let (query_tree, _) = TestContext::default().build(false, true, None, tokens).unwrap().unwrap(); assert_eq!(expected, query_tree); } #[test] fn optional_word() { let query = "hey my friend "; let analyzer = Analyzer::new(AnalyzerConfig::>::default()); let result = analyzer.analyze(query); let tokens = result.tokens(); let expected = Operation::Or( true, vec![ Operation::Query(Query { prefix: false, kind: QueryKind::exact("hey".to_string()), }), Operation::Or( false, vec![ Operation::And(vec![ Operation::Query(Query { prefix: false, kind: QueryKind::exact("hey".to_string()), }), Operation::Query(Query { prefix: false, kind: QueryKind::exact("my".to_string()), }), ]), Operation::Query(Query { prefix: false, kind: QueryKind::tolerant(1, "heymy".to_string()), }), ], ), Operation::Or( false, vec![ Operation::And(vec![ Operation::Query(Query { prefix: false, kind: QueryKind::exact("hey".to_string()), }), Operation::Or( false, vec![ Operation::And(vec![ Operation::Query(Query { prefix: false, kind: QueryKind::exact("my".to_string()), }), Operation::Query(Query { prefix: false, kind: QueryKind::tolerant(1, "friend".to_string()), }), ]), Operation::Query(Query { prefix: false, kind: QueryKind::tolerant(1, "myfriend".to_string()), }), ], ), ]), Operation::And(vec![ Operation::Query(Query { prefix: false, kind: QueryKind::tolerant(1, "heymy".to_string()), }), Operation::Query(Query { prefix: false, kind: QueryKind::tolerant(1, "friend".to_string()), }), ]), Operation::Query(Query { prefix: false, kind: QueryKind::tolerant(2, "heymyfriend".to_string()), }), ], ), ], ); let (query_tree, _) = TestContext::default().build(true, true, None, tokens).unwrap().unwrap(); assert_eq!(expected, query_tree); } #[test] fn optional_word_phrase() { let query = "\"hey my\""; let analyzer = Analyzer::new(AnalyzerConfig::>::default()); let result = analyzer.analyze(query); let tokens = result.tokens(); let expected = Operation::Phrase(vec!["hey".to_string(), "my".to_string()]); let (query_tree, _) = TestContext::default().build(true, true, None, tokens).unwrap().unwrap(); assert_eq!(expected, query_tree); } #[test] fn optional_word_multiple_phrases() { let query = r#""hey" my good "friend""#; let analyzer = Analyzer::new(AnalyzerConfig::>::default()); let result = analyzer.analyze(query); let tokens = result.tokens(); let expected = Operation::Or( true, vec![ Operation::And(vec![ Operation::Query(Query { prefix: false, kind: QueryKind::exact("hey".to_string()), }), Operation::Query(Query { prefix: false, kind: QueryKind::exact("friend".to_string()), }), ]), Operation::And(vec![ Operation::Query(Query { prefix: false, kind: QueryKind::exact("hey".to_string()), }), Operation::Query(Query { prefix: false, kind: QueryKind::exact("my".to_string()), }), Operation::Query(Query { prefix: false, kind: QueryKind::exact("friend".to_string()), }), ]), Operation::And(vec![ Operation::Query(Query { prefix: false, kind: QueryKind::exact("hey".to_string()), }), Operation::Or( false, vec![ Operation::And(vec![ Operation::Query(Query { prefix: false, kind: QueryKind::exact("my".to_string()), }), Operation::Query(Query { prefix: false, kind: QueryKind::exact("good".to_string()), }), ]), Operation::Query(Query { prefix: false, kind: QueryKind::tolerant(1, "mygood".to_string()), }), ], ), Operation::Query(Query { prefix: false, kind: QueryKind::exact("friend".to_string()), }), ]), ], ); let (query_tree, _) = TestContext::default().build(true, true, None, tokens).unwrap().unwrap(); assert_eq!(expected, query_tree); } #[test] fn no_typo() { let query = "hey friends "; let analyzer = Analyzer::new(AnalyzerConfig::>::default()); let result = analyzer.analyze(query); let tokens = result.tokens(); let expected = Operation::Or( false, vec![ Operation::And(vec![ Operation::Query(Query { prefix: false, kind: QueryKind::exact("hey".to_string()), }), Operation::Query(Query { prefix: false, kind: QueryKind::exact("friends".to_string()), }), ]), Operation::Query(Query { prefix: false, kind: QueryKind::exact("heyfriends".to_string()), }), ], ); let (query_tree, _) = TestContext::default().build(false, false, None, tokens).unwrap().unwrap(); assert_eq!(expected, query_tree); } #[test] fn words_limit() { let query = "\"hey my\" good friend"; let analyzer = Analyzer::new(AnalyzerConfig::>::default()); let result = analyzer.analyze(query); let tokens = result.tokens(); let expected = Operation::And(vec![ Operation::Phrase(vec!["hey".to_string(), "my".to_string()]), Operation::Query(Query { prefix: false, kind: QueryKind::exact("good".to_string()) }), ]); let (query_tree, _) = TestContext::default().build(false, false, Some(2), tokens).unwrap().unwrap(); assert_eq!(expected, query_tree); } }