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# tinystr [](https://crates.io/crates/tinystr) [](https://travis-ci.org/zbraniecki/tinystr) [](https://coveralls.io/github/zbraniecki/tinystr?branch=master)
`tinystr` is a small ASCII-only bounded length string representation.
Usage
-----
```rust
use tinystr::{TinyStr4, TinyStr8, TinyStr16, TinyStrAuto};
fn main() {
let s1: TinyStr4 = "tEsT".parse()
.expect("Failed to parse.");
assert_eq!(s1, "tEsT");
assert_eq!(s1.to_ascii_uppercase(), "TEST");
assert_eq!(s1.to_ascii_lowercase(), "test");
assert_eq!(s1.to_ascii_titlecase(), "Test");
assert_eq!(s1.is_ascii_alphanumeric(), true);
let s2: TinyStr8 = "New York".parse()
.expect("Failed to parse.");
assert_eq!(s2, "New York");
assert_eq!(s2.to_ascii_uppercase(), "NEW YORK");
assert_eq!(s2.to_ascii_lowercase(), "new york");
assert_eq!(s2.to_ascii_titlecase(), "New york");
assert_eq!(s2.is_ascii_alphanumeric(), false);
let s3: TinyStr16 = "metaMoRphosis123".parse()
.expect("Failed to parse.");
assert_eq!(s3, "metaMoRphosis123");
assert_eq!(s3.to_ascii_uppercase(), "METAMORPHOSIS123");
assert_eq!(s3.to_ascii_lowercase(), "metamorphosis123");
assert_eq!(s3.to_ascii_titlecase(), "Metamorphosis123");
assert_eq!(s3.is_ascii_alphanumeric(), true);
let s4: TinyStrAuto = "shortNoAlloc".parse().unwrap();
assert!(matches!(s4, TinyStrAuto::Tiny { .. }));
assert_eq!(s4, "shortNoAlloc");
let s5: TinyStrAuto = "longFallbackToHeap".parse().unwrap();
assert!(matches!(s4, TinyStrAuto::Heap { .. }));
assert_eq!(s4, "shortNoAlloc");
}
```
Details
-------
The crate provides three structs and an enum:
* `TinyStr4` an ASCII-only string limited to 4 characters.
* `TinyStr8` an ASCII-only string limited to 8 characters.
* `TinyStr16` an ASCII-only string limited to 16 characters.
* `TinyStrAuto` (enum):
* `Tiny` when the string is 16 characters or less.
* `Heap` when the string is 17 or more characters.
The structs stores the characters as `u32`/`u64`/`u128` and uses bitmasking to provide basic string manipulation operations:
* is_ascii_numeric
* is_ascii_alphabetic
* is_ascii_alphanumeric
* to_ascii_lowercase
* to_ascii_uppercase
* to_ascii_titlecase
* PartialEq
`TinyStrAuto` stores the string as a TinyStr16 when it is short enough, or else falls back to a standard `String`. You should use TinyStrAuto when you expect most strings to be 16 characters or smaller, but occasionally you receive one that exceeds that length. Unlike the structs, `TinyStrAuto` does not implement `Copy`.
This set is sufficient for certain classes of uses such as `unic-langid` libraries.
no_std
------
Disable the `std` feature of this crate to make it `#[no_std]`. Doing so disables `TinyStrAuto`. You
can re-enable `TinyStrAuto` in `#[no_std]` mode by enabling the `alloc` feature.
Performance
-----------
For those uses, TinyStr provides [performance characteristics](https://github.com/zbraniecki/tinystr/wiki/Performance) much better than the regular `String`.
Status
------
The crate is fully functional and ready to be used in production.
The capabilities can be extended.
#### License
<sup>
Licensed under either of <a href="LICENSE-APACHE">Apache License, Version
2.0</a> or <a href="LICENSE-MIT">MIT license</a> at your option.
</sup
|
