Determine if a char is a valid identifier for a parser and/or lexer according to Unicode Standard Annex #31 rules.

Documentation

extern crate unicode_xid;

use unicode_xid::UnicodeXID;

fn main() {
    let ch = 'a';
    println!("Is {} a valid start of an identifier? {}", ch, UnicodeXID::is_xid_start(ch));
}

unicode-xid supports a no_std feature. This eliminates dependence on std, and instead uses equivalent functions from core.

• Update to Unicode 15.1.0.

• Update to Unicode 15.0.0.
• Replace const tables with static tables.

• Update to Unicode 14.0.0.

• Add an ASCII fast-path.

• Update to Unicode 13.0.0.
• Speed up lookup.

• Update to Unicode 12.1.0.

• Initial release.