RFC9839-rs

A rust implementation of RFC9839 to test for problematic Unicode code points

Inspired by the Go implementation https://github.com/timbray/RFC9839/tree/main

What is RFC9839

RFC9839 includes a few definition for accepted character classes.

• Unicode Scalars

  Any Unicode code point except high-surrogate and low-surrogate code points

• Xml Characters

  Unicode code points that excludes surrogates, legacy C0 controls, and the noncharacters U+FFFE and U+FFFF.

• Unicode Assignables

  Unicode code points that are not problematic. This, a proper subset of each of the others, comprises all code points that are currently assigned, excluding legacy control codes, or that might be assigned in the future.

Why this crate

• no_std

  This crates does not make any allocations and thus can be used on embedded systems

• const fn

  Functions checking individual characters can all be called from a const context.

• Well tested

  Every character class is checked against the full u32 Range of possible values.