Crate naive_opt

Expand description

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
The ASCII Stochastics search
Support the zero overhead trait.
Support ignore ascii case match.
minimum support rustc 1.56.1 (59eed8a2a 2021-11-01)

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()`

Ignore ascii case match

This crate supports an ASCII case-insensitive match with each function.

this crate
`naive_opt::Search::search_ignore_ascii_case()`
`naive_opt::Search::rsearch_ignore_ascii_case()`
`naive_opt::Search::includes_ignore_ascii_case()`
`naive_opt::Search::search_indices_ignore_ascii_case()`
`naive_opt::Search::rsearch_indices_ignore_ascii_case()`

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));

Example Ignore ascii case match

use naive_opt::Search;

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

let v: Vec<_> = "abc345aBc901abc".search_indices_ignore_ascii_case("abc").collect();
assert_eq!(v, [(0, "abc"), (6, "aBc"), (12, "abc")]);
let v: Vec<_> = "abc345aBc901abc".rsearch_indices_ignore_ascii_case("abc").collect();
assert_eq!(v, [(12, "abc"), (6, "aBc"), (0, "abc")]);

assert_eq!("<A HREF=http://".includes_ignore_ascii_case("href"), true);