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feat: Make the automaton DFA construction lazy

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Clément Renault 2019-08-18 18:57:41 +02:00
parent 0ee56314fb
commit 7dc9ea78fa
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1 changed files with 18 additions and 5 deletions
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23
meilidb-core/src/query_builder.rs
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@ -29,17 +29,27 @@ struct Automaton {
ngram: usize,
query_len: usize,
is_exact: bool,
dfa: DFA,
is_prefix: bool,
query: String,
}
impl Automaton {
fn dfa(&self) -> DFA {
if self.is_prefix {
build_prefix_dfa(&self.query)
} else {
build_dfa(&self.query)
}
}
fn exact(index: usize, ngram: usize, query: &str) -> Automaton {
Automaton {
index,
ngram,
query_len: query.len(),
is_exact: true,
dfa: build_dfa(query),
is_prefix: false,
query: query.to_string(),
}
}
@ -49,7 +59,8 @@ impl Automaton {
ngram,
query_len: query.len(),
is_exact: true,
dfa: build_prefix_dfa(query),
is_prefix: true,
query: query.to_string(),
}
}
@ -59,7 +70,8 @@ impl Automaton {
ngram,
query_len: query.len(),
is_exact: false,
dfa: build_dfa(query),
is_prefix: false,
query: query.to_string(),
}
}
}
@ -344,7 +356,8 @@ where S: Store + Sync,
.par_bridge()
.try_for_each_with((sender, store, searchables), |data, automaton| {
let (sender, store, searchables) = data;
let Automaton { index, is_exact, query_len, dfa, .. } = automaton;
let Automaton { index, is_exact, query_len, .. } = automaton;
let dfa = automaton.dfa();
let words = store.words().map_err(Error::StoreError)?;
let mut stream = words.search(&dfa).into_stream();