naive_opt

The optimized naive string-search algorithm.

Features

The naive string-searching algorithm
Enhanced with 1-byte search like the libc++ and the libstd++ string::find
Specializing in UTF-8 strings, which is a feature of rust
Support the zero overhead trait.
minimum support: rustc 1.41.1 (f3e1a954d 2020-02-24)

Compatibility

This crate is implemented to replace the rust std library. However, the method names are different, so please rewrite your code. It shouldn't be too difficult.

compatibility:

rust `std::str`	this crate
`std::str::find()`	`naive_opt::Search::search()`
`std::str::rfind()`	`naive_opt::Search::rsearch()`
`std::str::contains()`	`naive_opt::Search::includes()`
`std::str::match_indices()`	`naive_opt::Search::search_indices()`
`std::str::rmatch_indices()`	`naive_opt::Search::rsearch_indices()`

Examples

Example function:

use naive_opt::{string_search, string_rsearch};
use naive_opt::{string_search_indices, string_rsearch_indices};

let haystack = "111 a 111b";
let needle = "a";
let r = string_search(haystack, needle);
assert_eq!(r, Some(4));

assert_eq!(string_search(haystack, "1"), Some(0));
assert_eq!(string_rsearch(haystack, "1"), Some(8));

let v: Vec<_> = string_search_indices("abc345abc901abc", "abc").collect();
assert_eq!(v, [(0, "abc"), (6, "abc"), (12, "abc")]);
let v: Vec<_> = string_rsearch_indices("abc345abc901abc", "abc").collect();
assert_eq!(v, [(12, "abc"), (6, "abc"), (0, "abc")]);

Example trait: Search

use naive_opt::Search;

let haystack = "111 a 111b";
let needle = "a";
let r = haystack.search(needle);
assert_eq!(r, Some(4));

assert_eq!(haystack.search("1"), Some(0));
assert_eq!(haystack.rsearch("1"), Some(8));

let v: Vec<_> = "abc345abc901abc".search_indices("abc").collect();
assert_eq!(v, [(0, "abc"), (6, "abc"), (12, "abc")]);
let v: Vec<_> = "abc345abc901abc".rsearch_indices("abc").collect();
assert_eq!(v, [(12, "abc"), (6, "abc"), (0, "abc")]);

Example trait: SearchIn

use naive_opt::SearchIn;

let haystack = "111 a 111b";
let needle = "a";
let r = needle.search_in(haystack);
assert_eq!(r, Some(4));

assert_eq!("1".search_in(haystack), Some(0));
assert_eq!("1".rsearch_in(haystack), Some(8));

Benchmark

compile by rustc 1.52.1 (9bc8c42bb 2021-05-09)

`name`	`bench:en`	`bench:ja`	`musl:en`	`musl:ja`
std_str_str	539.660 uc	478.930 uc	524.480 uc	479.960 uc
std_string_string	534.660 uc	481.690 uc	525.550 uc	470.390 uc
func_str_str	104.010 uc	103.600 uc	106.680 uc	104.950 uc
func_string_string	103.910 uc	104.140 uc	106.180 uc	105.840 uc
trait_str_str	97.082 uc	96.958 uc	98.712 uc	97.831 uc
trait_string_string	96.175 uc	96.488 uc	99.185 uc	99.046 uc
std_indices	457.130 uc	409.460 uc	459.220 uc	405.300 uc
func_indices	104.190 uc	120.680 uc	103.010 uc	122.950 uc
trait_indices	103.770 uc	120.560 uc	103.290 uc	122.650 uc

std is std::str::find()
us is micro seconds
:en is english haystack.
:ja is japanese haystack.
musl is x86_64-unknown-linux-musl
bench on intel Q6600 @ 2.40GHz

Changelogs

This crate's changelog here.

naive_opt 0.1.10