1 files changed, 46 insertions, 0 deletions
diff --git a/vendor/unicode-bidi/src/data_source.rs b/vendor/unicode-bidi/src/data_source.rs
new file mode 100644
index 0000000..319ad53
--- /dev/null
+++ b/vendor/unicode-bidi/src/data_source.rs
@@ -0,0 +1,46 @@
+// 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.
+
+use crate::BidiClass;
+
+/// This is the return value of [`BidiDataSource::bidi_matched_opening_bracket()`].
+///
+/// It represents the matching *normalized* opening bracket for a given bracket in a bracket pair,
+/// and whether or not that bracket is opening.
+#[derive(Debug, Copy, Clone)]
+pub struct BidiMatchedOpeningBracket {
+    /// The corresponding opening bracket in this bracket pair, normalized
+    ///
+    /// In case of opening brackets, this will be the bracket itself, except for when the bracket
+    /// is not normalized, in which case it will be the normalized form.
+    pub opening: char,
+    /// Whether or not the requested bracket was an opening bracket. True for opening
+    pub is_open: bool,
+}
+
+/// This trait abstracts over a data source that is able to produce the Unicode Bidi class for a given
+/// character
+pub trait BidiDataSource {
+    fn bidi_class(&self, c: char) -> BidiClass;
+    /// If this character is a bracket according to BidiBrackets.txt,
+    /// return the corresponding *normalized* *opening bracket* of the pair,
+    /// and whether or not it itself is an opening bracket.
+    ///
+    /// This effectively buckets brackets into equivalence classes keyed on the
+    /// normalized opening bracket.
+    ///
+    /// The default implementation will pull in a small amount of hardcoded data,
+    /// regardless of the `hardcoded-data` feature. This is in part for convenience
+    /// (since this data is small and changes less often), and in part so that this method can be
+    /// added without needing a breaking version bump.
+    /// Override this method in your custom data source to prevent the use of hardcoded data.
+    fn bidi_matched_opening_bracket(&self, c: char) -> Option<BidiMatchedOpeningBracket> {
+        crate::char_data::bidi_matched_opening_bracket(c)
+    }
+}