Implements Unicode case mapping for conventionally UTF-8 binary strings.

Case mapping or case conversion is a process whereby strings are converted to a particular form—uppercase, lowercase, or titlecase—possibly for display to the user.

roe can convert conventionally UTF-8 binary strings to capitalized, lowercase, and uppercase forms. This crate is used to implement String#capitalize, Symbol#capitalize, String#downcase, Symbol#downcase, String#upcase, and Symbol#upcase in Artichoke Ruby.

This crate depends on bstr.

This crate is currently a work in progress. When the API is complete, Roe will support lowercase, uppercase, titlecase, and case folding iterators for conventionally UTF-8 byte slices.

Roe will implement support for full, Turkic, ASCII, and case folding transforms.

Add this to your Cargo.toml:

[dependencies]
roe = "0.0.3"

Then convert case like:

use roe::{LowercaseMode, UppercaseMode};

assert_eq!(
    roe::lowercase(b"Artichoke Ruby", LowercaseMode::Ascii).collect::<Vec<_>>(),
    b"artichoke ruby"
);
assert_eq!(
    roe::uppercase("Αύριο".as_bytes(), UppercaseMode::Full).collect::<Vec<_>>(),
    "ΑΎΡΙΟ".as_bytes()
);

roe is no_std compatible with an optional dependency on the alloc crate.

roe has several Cargo features, all of which are enabled by default:

• std - Adds a dependency on std, the Rust Standard Library. This feature enables std::error::Error implementations on error types in this crate. Enabling the std feature also enables the alloc feature.
• alloc - Adds a dependency on alloc, the Rust allocation and collections library. This feature enables APIs that allocate String or Vec.

roe is licensed under the MIT License (c) Ryan Lopopolo.