map: Allow using the Levenshtein algorithm to search
This commit is contained in:
Kerollmops
parent
0581b296bb
commit
96d2fbcd3d
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@ -99,6 +99,15 @@ dependencies = [
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"memmap 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "fst-levenshtein"
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version = "0.2.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"fst 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
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"utf8-ranges 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "fuchsia-zircon"
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version = "0.3.3"
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@ -306,6 +315,7 @@ dependencies = [
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"bincode 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
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"env_logger 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
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"fst 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
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"fst-levenshtein 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
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"futures 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
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"serde 1.0.42 (registry+https://github.com/rust-lang/crates.io-index)",
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"serde_derive 1.0.42 (registry+https://github.com/rust-lang/crates.io-index)",
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@ -598,6 +608,11 @@ dependencies = [
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"percent-encoding 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "utf8-ranges"
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version = "0.1.3"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "winapi"
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version = "0.2.8"
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@ -650,6 +665,7 @@ dependencies = [
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"checksum dtoa 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "09c3753c3db574d215cba4ea76018483895d7bff25a31b49ba45db21c48e50ab"
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"checksum env_logger 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "15abd780e45b3ea4f76b4e9a26ff4843258dd8a3eed2775a0e7368c2e7936c2f"
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"checksum fst 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d94485a00b1827b861dd9d1a2cc9764f9044d4c535514c0760a5a2012ef3399f"
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"checksum fst-levenshtein 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "64f12af1569dd78afbefe476034bbdce0372d18e9dc75b634bde0e7b8bf994c8"
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"checksum fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "2e9763c69ebaae630ba35f74888db465e49e259ba1bc0eda7d06f4a067615d82"
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"checksum fuchsia-zircon-sys 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "3dcaa9ae7725d12cdb85b3ad99a434db70b468c09ded17e012d86b5c1010f7a7"
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"checksum futures 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)" = "1a70b146671de62ec8c8ed572219ca5d594d9b06c0b364d5e67b722fc559b48c"
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@ -706,6 +722,7 @@ dependencies = [
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"checksum unicode-normalization 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "51ccda9ef9efa3f7ef5d91e8f9b83bbe6955f9bf86aec89d5cce2c874625920f"
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"checksum unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "fc72304796d0818e357ead4e000d19c9c174ab23dc11093ac919054d20a6a7fc"
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"checksum url 1.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f808aadd8cfec6ef90e4a14eb46f24511824d1ac596b9682703c87056c8678b7"
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"checksum utf8-ranges 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a1ca13c08c41c9c3e04224ed9ff80461d97e121589ff27c753a16cb10830ae0f"
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"checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
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"checksum winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "04e3bd221fcbe8a271359c04f21a76db7d0c6028862d1bb5512d85e1e2eb5bb3"
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"checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
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@ -7,12 +7,13 @@ authors = ["Kerollmops <renault.cle@gmail.com>"]
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bincode = "1.0"
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env_logger = { version = "0.3", default-features = false }
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fst = "0.3"
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fst-levenshtein = "0.2"
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futures = "0.1"
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serde = "1.0"
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serde_derive = "1.0"
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serde_json = "1.0"
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smallvec = { version = "0.6", features = ["serde"] }
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tokio-minihttp = { git = "https://github.com/tokio-rs/tokio-minihttp.git" }
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tokio-proto = "0.1"
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tokio-service = "0.1"
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serde = "1.0"
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serde_json = "1.0"
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serde_derive = "1.0"
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smallvec = { version = "0.6", features = ["serde"] }
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url = "1.7"
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@ -1,4 +1,6 @@
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extern crate env_logger;
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extern crate fst;
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extern crate fst_levenshtein;
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extern crate futures;
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extern crate raptor;
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extern crate tokio_minihttp;
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@ -8,6 +10,8 @@ extern crate url;
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use std::io;
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use fst_levenshtein::Levenshtein;
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use fst::{IntoStreamer, Streamer};
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use futures::future;
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use tokio_minihttp::{Request, Response, Http};
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use tokio_proto::TcpServer;
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@ -34,8 +38,18 @@ impl Service for MainService {
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if let Some((_, key)) = url.query_pairs().find(|&(ref k, _)| k == "q") {
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let key = key.to_lowercase();
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let values = self.map.get(&key).map(|a| &a[..10]);
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resp.body(&format!("{:?}", values));
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let lev = Levenshtein::new(&key, 2).unwrap();
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let mut body = String::new();
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let mut stream = self.map.search(lev).into_stream();
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while let Some((key, values)) = stream.next() {
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let values = &values[..values.len().min(10)];
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body.push_str(&format!("{:?} {:?}\n", key, values));
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}
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resp.body(&body);
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}
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future::ok(resp)
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40
src/lib.rs
40
src/lib.rs
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@ -5,6 +5,7 @@ extern crate serde_json;
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#[macro_use] extern crate serde_derive;
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extern crate smallvec;
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use std::ops::{Deref, DerefMut};
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use std::io::Write;
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use std::fs::File;
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use std::path::Path;
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@ -50,6 +51,45 @@ impl MultiMap {
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pub fn get<K: AsRef<[u8]>>(&self, key: K) -> Option<&[u64]> {
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self.map.get(key).map(|i| &*self.values[i as usize])
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}
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pub fn search<A: fst::Automaton>(&self, aut: A) -> StreamBuilder<A> {
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StreamBuilder {
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inner: self.map.search(aut),
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values: &self.values,
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}
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}
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}
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pub struct StreamBuilder<'a, A: fst::Automaton> {
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inner: fst::map::StreamBuilder<'a, A>,
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values: &'a [SmallVec32<u64>],
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}
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impl<'a, A: fst::Automaton> Deref for StreamBuilder<'a, A> {
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type Target = fst::map::StreamBuilder<'a, A>;
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fn deref(&self) -> &Self::Target {
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&self.inner
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}
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}
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impl<'a, A: fst::Automaton> DerefMut for StreamBuilder<'a, A> {
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fn deref_mut(&mut self) -> &mut Self::Target {
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&mut self.inner
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}
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}
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impl<'a, A: fst::Automaton> fst::IntoStreamer<'a> for StreamBuilder<'a, A> {
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type Item = (&'a str, &'a [u64]);
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type Into = Stream<'a, A>;
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fn into_stream(self) -> Self::Into {
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Stream {
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inner: self.inner.into_stream(),
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values: self.values,
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}
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}
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}
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pub struct Stream<'a, A: fst::Automaton = fst::automaton::AlwaysMatch> {
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