| // Copyright 2015 The Servo Project Developers. See the |
| // COPYRIGHT file at the top-level directory of this distribution. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| //! Accessor for `Bidi_Class` property from Unicode Character Database (UCD) |
| |
| mod tables; |
| |
| pub use self::tables::{BidiClass, UNICODE_VERSION}; |
| |
| use core::cmp::Ordering::{Equal, Less, Greater}; |
| use core::char; |
| |
| use self::tables::bidi_class_table; |
| use crate::BidiClass::*; |
| |
| /// Find the `BidiClass` of a single char. |
| pub fn bidi_class(c: char) -> BidiClass { |
| bsearch_range_value_table(c, bidi_class_table) |
| } |
| |
| pub fn is_rtl(bidi_class: BidiClass) -> bool { |
| match bidi_class { |
| RLE | RLO | RLI => true, |
| _ => false, |
| } |
| } |
| |
| fn bsearch_range_value_table(c: char, r: &'static [(char, char, BidiClass)]) -> BidiClass { |
| match r.binary_search_by(|&(lo, hi, _)| if lo <= c && c <= hi { |
| Equal |
| } else if hi < c { |
| Less |
| } else { |
| Greater |
| }) { |
| Ok(idx) => { |
| let (_, _, cat) = r[idx]; |
| cat |
| } |
| // UCD/extracted/DerivedBidiClass.txt: "All code points not explicitly listed |
| // for Bidi_Class have the value Left_To_Right (L)." |
| Err(_) => L, |
| } |
| } |
| |
| #[cfg(test)] |
| mod tests { |
| use super::*; |
| |
| #[test] |
| fn test_ascii() { |
| assert_eq!(bidi_class('\u{0000}'), BN); |
| assert_eq!(bidi_class('\u{0040}'), ON); |
| assert_eq!(bidi_class('\u{0041}'), L); |
| assert_eq!(bidi_class('\u{0062}'), L); |
| assert_eq!(bidi_class('\u{007F}'), BN); |
| } |
| |
| #[test] |
| fn test_bmp() { |
| // Hebrew |
| assert_eq!(bidi_class('\u{0590}'), R); |
| assert_eq!(bidi_class('\u{05D0}'), R); |
| assert_eq!(bidi_class('\u{05D1}'), R); |
| assert_eq!(bidi_class('\u{05FF}'), R); |
| |
| // Arabic |
| assert_eq!(bidi_class('\u{0600}'), AN); |
| assert_eq!(bidi_class('\u{0627}'), AL); |
| assert_eq!(bidi_class('\u{07BF}'), AL); |
| |
| // Default R + Arabic Extras |
| assert_eq!(bidi_class('\u{07C0}'), R); |
| assert_eq!(bidi_class('\u{085F}'), R); |
| assert_eq!(bidi_class('\u{0860}'), AL); |
| assert_eq!(bidi_class('\u{0870}'), R); |
| assert_eq!(bidi_class('\u{089F}'), R); |
| assert_eq!(bidi_class('\u{08A0}'), AL); |
| assert_eq!(bidi_class('\u{089F}'), R); |
| assert_eq!(bidi_class('\u{08FF}'), NSM); |
| |
| // Default ET |
| assert_eq!(bidi_class('\u{20A0}'), ET); |
| assert_eq!(bidi_class('\u{20CF}'), ET); |
| |
| // Arabic Presentation Forms |
| assert_eq!(bidi_class('\u{FB1D}'), R); |
| assert_eq!(bidi_class('\u{FB4F}'), R); |
| assert_eq!(bidi_class('\u{FB50}'), AL); |
| assert_eq!(bidi_class('\u{FDCF}'), AL); |
| assert_eq!(bidi_class('\u{FDF0}'), AL); |
| assert_eq!(bidi_class('\u{FDFF}'), AL); |
| assert_eq!(bidi_class('\u{FE70}'), AL); |
| assert_eq!(bidi_class('\u{FEFE}'), AL); |
| assert_eq!(bidi_class('\u{FEFF}'), BN); |
| |
| // noncharacters |
| assert_eq!(bidi_class('\u{FDD0}'), L); |
| assert_eq!(bidi_class('\u{FDD1}'), L); |
| assert_eq!(bidi_class('\u{FDEE}'), L); |
| assert_eq!(bidi_class('\u{FDEF}'), L); |
| assert_eq!(bidi_class('\u{FFFE}'), L); |
| assert_eq!(bidi_class('\u{FFFF}'), L); |
| } |
| |
| #[test] |
| fn test_smp() { |
| // Default AL + R |
| assert_eq!(bidi_class('\u{10800}'), R); |
| assert_eq!(bidi_class('\u{10FFF}'), R); |
| assert_eq!(bidi_class('\u{1E800}'), R); |
| assert_eq!(bidi_class('\u{1EDFF}'), R); |
| assert_eq!(bidi_class('\u{1EE00}'), AL); |
| assert_eq!(bidi_class('\u{1EEFF}'), AL); |
| assert_eq!(bidi_class('\u{1EF00}'), R); |
| assert_eq!(bidi_class('\u{1EFFF}'), R); |
| } |
| |
| #[test] |
| fn test_unassigned_planes() { |
| assert_eq!(bidi_class('\u{30000}'), L); |
| assert_eq!(bidi_class('\u{40000}'), L); |
| assert_eq!(bidi_class('\u{50000}'), L); |
| assert_eq!(bidi_class('\u{60000}'), L); |
| assert_eq!(bidi_class('\u{70000}'), L); |
| assert_eq!(bidi_class('\u{80000}'), L); |
| assert_eq!(bidi_class('\u{90000}'), L); |
| assert_eq!(bidi_class('\u{a0000}'), L); |
| } |
| } |
