60 lines
3.0 KiB
Markdown
60 lines
3.0 KiB
Markdown
# encode_unicode
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UTF-8 and UTF-16 character types, iterators and related methods for `char`, `u8` and `u16`.
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[](https://crates.io/crates/encode_unicode/)
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## Features
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* **[`Utf8Char`](https://docs.rs/encode_unicode/latest/encode_unicode/struct.Utf8Char.html)**:
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A `char` stored as UTF-8. Can be borrowed as a `str` or `u8` slice.
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* **[`Utf16Char`](https://docs.rs/encode_unicode/latest/encode_unicode/struct.Utf16Char.html)**:
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A `char` stored as UTF-16. Can be borrowed as an `u16` slice.
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* [Conversion methods on `char`](https://docs.rs/encode_unicode/latest/encode_unicode/trait.CharExt.html):
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* to and from UTF-8 as `[u8; 4]` or slice.
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* to and from UTF-16 as `(u16, Option<u16>)` or slice.
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* [Iterator adapters](https://docs.rs/encode_unicode/latest/encode_unicode/trait.IterExt.html)
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for converting betwenn `u8`s and `Utf8Char`s or `u16`s and `Utf16Char`s.
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* Optimized [slice-based decoding iterators](https://docs.rs/encode_unicode/latest/encode_unicode/trait.SliceExt.html).
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* [Precise errors when decoding a char from UTF-8, UTF-16 or `u32` fails](http://docs.rs/encode_unicode/latest/encode_unicode/error/index.html).
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* Utility methods on [`u8`](https://docs.rs/encode_unicode/latest/encode_unicode/trait.U8UtfExt.html)
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and [`u16`](https://docs.rs/encode_unicode/latest/encode_unicode/trait.U16UtfExt.html).
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The minimum supported version of Rust is 1.15,
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older versions might work now but can break with a minor update.
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## Optional features
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* `#![no_std]`-mode: There are a few differences:
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* `Error` doesn't exist, but `description()` is made available as an inherent impl.
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* `Extend`/`FromIterator`-implementations for `String`/`Vec<u8>`/`Vec<u16>` are missing.
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* There is no `io`, so `Utf8Iterator` and `Utf8CharSplitter` doesn't implement `Read`.
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This feature is enabled by setting `default-features=false` in `Cargo.toml`:
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`encode_unicode = {version="0.3.4", default-features=false}`.
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* Integration with the [ascii](https://tomprogrammer.github.io/rust-ascii/ascii/index.html) crate:
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Convert `Utf8Char` and `Utf16Char` to and from [ascii::`AsciiChar`](https://tomprogrammer.github.io/rust-ascii/ascii/enum.AsciiChar.html).
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## License
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Licensed under either of
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* Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
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* MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
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at your option.
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### Contribution
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Unless you explicitly state otherwise, any contribution intentionally
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submitted for inclusion in the work by you, as defined in the Apache-2.0
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license, shall be dual licensed as above, without any additional terms or
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conditions.
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## History
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The original purpose of this crate was to provide standins for the then
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unstable `encode_utf8()` and `encode_utf16()`.
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The standins were removed in 0.3 when Rust 1.15 stabilized the `encode_`
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methods, but the other stuff I added, such as iterators like
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those `encode_utf{8,16}() returned for a while, might still be of use.
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