naive_opt 0.1.5

The optimized naive string-search algorithm.
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# 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:

```rust
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

```rust
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

```rust
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

|         `name`          | `bench:en`  | `bench:ja`  |  `musl:en`  |  `musl:ja`  |
|:------------------------|------------:|------------:|------------:|------------:|
| std_str_str             |  445.560 uc |  355.440 uc |  458.540 uc |  359.400 uc |
| std_string_string       |  450.900 uc |  355.110 uc |  453.940 uc |  354.490 uc |
| func_str_str            |   57.928 uc |   56.888 uc |   59.602 uc |   59.365 uc |
| func_string_string      |   56.754 uc |   56.721 uc |   59.276 uc |   59.016 uc |
| trait_str_str           |   50.825 uc |   49.719 uc |   52.659 uc |   52.919 uc |
| trait_string_string     |   49.898 uc |   49.951 uc |   52.263 uc |   52.721 uc |
| std_indices             |  349.200 uc |  269.560 uc |  373.310 uc |  267.570 uc |
| func_indices            |   51.955 uc |   52.269 uc |   55.074 uc |   54.534 uc |
| trait_indices           |   52.235 uc |   52.201 uc |   54.549 uc |   54.589 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
- compile by rustc 1.50.0 (cb75ad5db 2021-02-10)
- bench on intel Q6600 @ 2.40GHz


## Changelogs

[This crate's changelog here.](https://github.com/aki-akaguma/naive_opt/blob/main/CHANGELOG.md)


## References

[my research: string searching algorithm](https://github.com/aki-akaguma/cmp_string_searching_algorithm)
[my research: string find](https://github.com/aki-akaguma/cmp_string_find)
[wikipedia: string searching algprithm](https://en.wikipedia.org/wiki/String-searching_algorithm)