This crate contains a list of all unicode blocks and provides some functions to search across them.
extern crate unicode_blocks;
assert_eq!(unicode_blocks::BASIC_LATIN, unicode_blocks::find_unicode_block('A').unwrap());
extern crate unicode_blocks;
assert!(unicode_blocks::is_cjk_block(unicode_blocks::CJK_UNIFIED_IDEOGRAPHS));
extern crate unicode_blocks;
assert!(unicode_blocks::is_cjk('。'));
https://crates.io/crates/unicode-blocks