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    // Copyright 2017 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.

    //! Directional Formatting Characters
    //!
    //! <http://www.unicode.org/reports/tr9/#Directional_Formatting_Characters>

    // == Implicit ==
    /// ARABIC LETTER MARK
    pub const ALM: char = '\u{061C}';
    /// LEFT-TO-RIGHT MARK
    pub const LRM: char = '\u{200E}';
    /// RIGHT-TO-LEFT MARK
    pub const RLM: char = '\u{200F}';

    // == Explicit Isolates ==
    /// LEFT‑TO‑RIGHT ISOLATE
    pub const LRI: char = '\u{2066}';
    /// RIGHT‑TO‑LEFT ISOLATE
    pub const RLI: char = '\u{2067}';
    /// FIRST STRONG ISOLATE
    pub const FSI: char = '\u{2068}';
    /// POP DIRECTIONAL ISOLATE
    pub const PDI: char = '\u{2069}';

    // == Explicit Embeddings and Overrides ==
    /// LEFT-TO-RIGHT EMBEDDING
    pub const LRE: char = '\u{202A}';
    /// RIGHT-TO-LEFT EMBEDDING
    pub const RLE: char = '\u{202B}';
    /// POP DIRECTIONAL FORMATTING
    pub const PDF: char = '\u{202C}';
    /// LEFT-TO-RIGHT OVERRIDE
    pub const LRO: char = '\u{202D}';
    /// RIGHT-TO-LEFT OVERRIDE
    pub const RLO: char = '\u{202E}';