1 files changed, 157 insertions, 0 deletions
diff --git a/third_party/rust/unicode-bidi/src/char_data/mod.rs b/third_party/rust/unicode-bidi/src/char_data/mod.rs
new file mode 100644
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+++ b/third_party/rust/unicode-bidi/src/char_data/mod.rs
@@ -0,0 +1,157 @@
+// 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};
+#[cfg(feature = "hardcoded-data")]
+use core::char;
+#[cfg(feature = "hardcoded-data")]
+use core::cmp::Ordering::{Equal, Greater, Less};
+
+#[cfg(feature = "hardcoded-data")]
+use self::tables::bidi_class_table;
+use crate::BidiClass::*;
+#[cfg(feature = "hardcoded-data")]
+use crate::BidiDataSource;
+
+/// Hardcoded Bidi data that ships with the unicode-bidi crate.
+///
+/// This can be enabled with the default `hardcoded-data` Cargo feature.
+#[cfg(feature = "hardcoded-data")]
+pub struct HardcodedBidiData;
+
+#[cfg(feature = "hardcoded-data")]
+impl BidiDataSource for HardcodedBidiData {
+    fn bidi_class(&self, c: char) -> BidiClass {
+        bsearch_range_value_table(c, bidi_class_table)
+    }
+}
+
+/// Find the `BidiClass` of a single char.
+#[cfg(feature = "hardcoded-data")]
+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,
+    }
+}
+
+#[cfg(feature = "hardcoded-data")]
+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(all(test, feature = "hardcoded-data"))]
+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}'), AL);
+        assert_eq!(bidi_class('\u{089F}'), NSM);
+        assert_eq!(bidi_class('\u{08A0}'), AL);
+        assert_eq!(bidi_class('\u{089F}'), NSM);
+        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}'), ON);
+        assert_eq!(bidi_class('\u{FDF0}'), AL);
+        assert_eq!(bidi_class('\u{FDFF}'), ON);
+        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);
+    }
+}