// 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)

    }

Unexecuted instantiation: <icu_properties::bidi::BidiClassAdapter as unicode_bidi::data_source::BidiDataSource>::bidi_matched_opening_bracket

Unexecuted instantiation: <_ as unicode_bidi::data_source::BidiDataSource>::bidi_matched_opening_bracket

}