Drop Harfbuzz feature

We aren't using it and there are no dependants of this crate listed on
crates.io and not results from a search:
`language:toml yeslogic-unicode-script` on GitHub. It complicates
updates by the dependencies being incompatible with older versions
of rustc.

.github/workflows/ci.yml

@@ -29,4 +29,3 @@ jobs:
           components: rustfmt
       - run: cargo fmt -- --check
       - run: cargo test
-      - run: cargo test --features harfbuzz

Cargo.toml

@@ -20,10 +20,3 @@ categories = ["text-processing"]
 
 [lib]
 name = "unicode_script"
-
-[features]
-harfbuzz = ["harfbuzz-sys"]
-
-[dependencies.harfbuzz-sys]
-version = "0.6.1"
-optional = true

src/lib.rs

@@ -27,201 +27,6 @@ pub use tables::Script;
 /// that this version of unicode-script is based on.
 pub const UNICODE_VERSION: (u64, u64, u64) = (16, 0, 0);
 
-#[cfg(feature = "harfbuzz")]
-extern crate harfbuzz_sys;
-
-impl Script {
-    #[cfg(feature = "harfbuzz")]
-    pub fn to_hb_script(self) -> harfbuzz_sys::hb_script_t {
-        use harfbuzz_sys::*;
-        use Script::*;
-        match self {
-            Adlam => HB_SCRIPT_ADLAM,
-            Ahom => HB_SCRIPT_AHOM,
-            AnatolianHieroglyphs => HB_SCRIPT_ANATOLIAN_HIEROGLYPHS,
-            Arabic => HB_SCRIPT_ARABIC,
-            Armenian => HB_SCRIPT_ARMENIAN,
-            Avestan => HB_SCRIPT_AVESTAN,
-            Balinese => HB_SCRIPT_BALINESE,
-            Bamum => HB_SCRIPT_BAMUM,
-            BassaVah => HB_SCRIPT_BASSA_VAH,
-            Batak => HB_SCRIPT_BATAK,
-            Bengali => HB_SCRIPT_BENGALI,
-            Bhaiksuki => HB_SCRIPT_BHAIKSUKI,
-            Bopomofo => HB_SCRIPT_BOPOMOFO,
-            Brahmi => HB_SCRIPT_BRAHMI,
-            Braille => HB_SCRIPT_BRAILLE,
-            Buginese => HB_SCRIPT_BUGINESE,
-            Buhid => HB_SCRIPT_BUHID,
-            CanadianAboriginal => HB_SCRIPT_CANADIAN_SYLLABICS,
-            Carian => HB_SCRIPT_CARIAN,
-            CaucasianAlbanian => HB_SCRIPT_CAUCASIAN_ALBANIAN,
-            Chakma => HB_SCRIPT_CHAKMA,
-            Cham => HB_SCRIPT_CHAM,
-            Cherokee => HB_SCRIPT_CHEROKEE,
-            Chorasmian => HB_SCRIPT_CHORASMIAN,
-            Common => HB_SCRIPT_COMMON,
-            Coptic => HB_SCRIPT_COPTIC,
-            Cuneiform => HB_SCRIPT_CUNEIFORM,
-            Cypriot => HB_SCRIPT_CYPRIOT,
-            Cyrillic => HB_SCRIPT_CYRILLIC,
-            Deseret => HB_SCRIPT_DESERET,
-            Devanagari => HB_SCRIPT_DEVANAGARI,
-            DivesAkuru => HB_SCRIPT_DIVES_AKURU,
-            Dogra => HB_SCRIPT_DOGRA,
-            Duployan => HB_SCRIPT_DUPLOYAN,
-            EgyptianHieroglyphs => HB_SCRIPT_EGYPTIAN_HIEROGLYPHS,
-            Elbasan => HB_SCRIPT_ELBASAN,
-            Elymaic => HB_SCRIPT_ELYMAIC,
-            Ethiopic => HB_SCRIPT_ETHIOPIC,
-            Georgian => HB_SCRIPT_GEORGIAN,
-            Glagolitic => HB_SCRIPT_GLAGOLITIC,
-            Gothic => HB_SCRIPT_GOTHIC,
-            Grantha => HB_SCRIPT_GRANTHA,
-            Greek => HB_SCRIPT_GREEK,
-            Gujarati => HB_SCRIPT_GUJARATI,
-            GunjalaGondi => HB_SCRIPT_GUNJALA_GONDI,
-            Gurmukhi => HB_SCRIPT_GURMUKHI,
-            Han => HB_SCRIPT_HAN,
-            Hangul => HB_SCRIPT_HANGUL,
-            HanifiRohingya => HB_SCRIPT_HANIFI_ROHINGYA,
-            Hanunoo => HB_SCRIPT_HANUNOO,
-            Hatran => HB_SCRIPT_HATRAN,
-            Hebrew => HB_SCRIPT_HEBREW,
-            Hiragana => HB_SCRIPT_HIRAGANA,
-            ImperialAramaic => HB_SCRIPT_IMPERIAL_ARAMAIC,
-            Inherited => HB_SCRIPT_INHERITED,
-            InscriptionalPahlavi => HB_SCRIPT_INSCRIPTIONAL_PAHLAVI,
-            InscriptionalParthian => HB_SCRIPT_INSCRIPTIONAL_PARTHIAN,
-            Javanese => HB_SCRIPT_JAVANESE,
-            Kaithi => HB_SCRIPT_KAITHI,
-            Kannada => HB_SCRIPT_KANNADA,
-            Katakana => HB_SCRIPT_KATAKANA,
-            KayahLi => HB_SCRIPT_KAYAH_LI,
-            Kharoshthi => HB_SCRIPT_KHAROSHTHI,
-            KhitanSmallScript => HB_SCRIPT_KHITAN_SMALL_SCRIPT,
-            Khmer => HB_SCRIPT_KHMER,
-            Khojki => HB_SCRIPT_KHOJKI,
-            Khudawadi => HB_SCRIPT_KHUDAWADI,
-            Lao => HB_SCRIPT_LAO,
-            Latin => HB_SCRIPT_LATIN,
-            Lepcha => HB_SCRIPT_LEPCHA,
-            Limbu => HB_SCRIPT_LIMBU,
-            LinearA => HB_SCRIPT_LINEAR_A,
-            LinearB => HB_SCRIPT_LINEAR_B,
-            Lisu => HB_SCRIPT_LISU,
-            Lycian => HB_SCRIPT_LYCIAN,
-            Lydian => HB_SCRIPT_LYDIAN,
-            Mahajani => HB_SCRIPT_MAHAJANI,
-            Makasar => HB_SCRIPT_MAKASAR,
-            Malayalam => HB_SCRIPT_MALAYALAM,
-            Mandaic => HB_SCRIPT_MANDAIC,
-            Manichaean => HB_SCRIPT_MANICHAEAN,
-            Marchen => HB_SCRIPT_MARCHEN,
-            MasaramGondi => HB_SCRIPT_MASARAM_GONDI,
-            Medefaidrin => HB_SCRIPT_MEDEFAIDRIN,
-            MeeteiMayek => HB_SCRIPT_MEETEI_MAYEK,
-            MendeKikakui => HB_SCRIPT_MENDE_KIKAKUI,
-            MeroiticCursive => HB_SCRIPT_MEROITIC_CURSIVE,
-            MeroiticHieroglyphs => HB_SCRIPT_MEROITIC_HIEROGLYPHS,
-            Miao => HB_SCRIPT_MIAO,
-            Modi => HB_SCRIPT_MODI,
-            Mongolian => HB_SCRIPT_MONGOLIAN,
-            Mro => HB_SCRIPT_MRO,
-            Multani => HB_SCRIPT_MULTANI,
-            Myanmar => HB_SCRIPT_MYANMAR,
-            Nabataean => HB_SCRIPT_NABATAEAN,
-            Nandinagari => HB_SCRIPT_NANDINAGARI,
-            NewTaiLue => HB_SCRIPT_NEW_TAI_LUE,
-            Newa => HB_SCRIPT_NEWA,
-            Nko => HB_SCRIPT_NKO,
-            Nushu => HB_SCRIPT_NUSHU,
-            NyiakengPuachueHmong => HB_SCRIPT_NYIAKENG_PUACHUE_HMONG,
-            Ogham => HB_SCRIPT_OGHAM,
-            OlChiki => HB_SCRIPT_OL_CHIKI,
-            OldHungarian => HB_SCRIPT_OLD_HUNGARIAN,
-            OldItalic => HB_SCRIPT_OLD_ITALIC,
-            OldNorthArabian => HB_SCRIPT_OLD_NORTH_ARABIAN,
-            OldPermic => HB_SCRIPT_OLD_PERMIC,
-            OldPersian => HB_SCRIPT_OLD_PERSIAN,
-            OldSogdian => HB_SCRIPT_OLD_SOGDIAN,
-            OldSouthArabian => HB_SCRIPT_OLD_SOUTH_ARABIAN,
-            OldTurkic => HB_SCRIPT_OLD_TURKIC,
-            Oriya => HB_SCRIPT_ORIYA,
-            Osage => HB_SCRIPT_OSAGE,
-            Osmanya => HB_SCRIPT_OSMANYA,
-            PahawhHmong => HB_SCRIPT_PAHAWH_HMONG,
-            Palmyrene => HB_SCRIPT_PALMYRENE,
-            PauCinHau => HB_SCRIPT_PAU_CIN_HAU,
-            PhagsPa => HB_SCRIPT_PHAGS_PA,
-            Phoenician => HB_SCRIPT_PHOENICIAN,
-            PsalterPahlavi => HB_SCRIPT_PSALTER_PAHLAVI,
-            Rejang => HB_SCRIPT_REJANG,
-            Runic => HB_SCRIPT_RUNIC,
-            Samaritan => HB_SCRIPT_SAMARITAN,
-            Saurashtra => HB_SCRIPT_SAURASHTRA,
-            Sharada => HB_SCRIPT_SHARADA,
-            Shavian => HB_SCRIPT_SHAVIAN,
-            Siddham => HB_SCRIPT_SIDDHAM,
-            Signwriting => HB_SCRIPT_SIGNWRITING,
-            Sinhala => HB_SCRIPT_SINHALA,
-            Sogdian => HB_SCRIPT_SOGDIAN,
-            SoraSompeng => HB_SCRIPT_SORA_SOMPENG,
-            Soyombo => HB_SCRIPT_SOYOMBO,
-            Sundanese => HB_SCRIPT_SUNDANESE,
-            SylotiNagri => HB_SCRIPT_SYLOTI_NAGRI,
-            Syriac => HB_SCRIPT_SYRIAC,
-            Tagalog => HB_SCRIPT_TAGALOG,
-            Tagbanwa => HB_SCRIPT_TAGBANWA,
-            TaiLe => HB_SCRIPT_TAI_LE,
-            TaiTham => HB_SCRIPT_TAI_THAM,
-            TaiViet => HB_SCRIPT_TAI_VIET,
-            Takri => HB_SCRIPT_TAKRI,
-            Tamil => HB_SCRIPT_TAMIL,
-            Tangut => HB_SCRIPT_TANGUT,
-            Telugu => HB_SCRIPT_TELUGU,
-            Thaana => HB_SCRIPT_THAANA,
-            Thai => HB_SCRIPT_THAI,
-            Tibetan => HB_SCRIPT_TIBETAN,
-            Tifinagh => HB_SCRIPT_TIFINAGH,
-            Tirhuta => HB_SCRIPT_TIRHUTA,
-            Ugaritic => HB_SCRIPT_UGARITIC,
-            Unknown => HB_SCRIPT_UNKNOWN,
-            Vai => HB_SCRIPT_VAI,
-            Wancho => HB_SCRIPT_WANCHO,
-            WarangCiti => HB_SCRIPT_WARANG_CITI,
-            Yezidi => HB_SCRIPT_YEZIDI,
-            Yi => HB_SCRIPT_YI,
-            ZanabazarSquare => HB_SCRIPT_ZANABAZAR_SQUARE,
-
-            // Added in Harfbuzz 3.0.0 but harfbuzz_sys has not been updated to that version
-            // CyproMinoan => HB_SCRIPT_CYPRO_MINOAN,
-            // OldUyghur => HB_SCRIPT_OLD_UYGHUR,
-            // Tangsa => HB_SCRIPT_TANGSA,
-            // Toto => HB_SCRIPT_TOTO,
-            // Vithkuqi => HB_SCRIPT_VITHKUQI,
-
-            // Added in Unicode 15.0
-            // Kawi => HB_SCRIPT_KAWI
-            // NagMundari => HB_SCRIPT_NAG_MUNDARI
-
-            // Added in Unicode 16.0
-            // Garay =>HB_SCRIPT_GARAY,
-            // GurungKhema => HB_SCRIPT_GURUNG_KHEMA,
-            // KiratRai => HB_SCRIPT_KIRAT_RAI,
-            // OlOnal => HB_SCIRPT_OLONAL,
-            // Sunuwar => HB_SCRIPT_SUNUWAR,
-            // Todhri | TuluTigalari
-
-            // So for now we return HB_SCRIPT_INVALID
-            CyproMinoan | Kawi | NagMundari | OldUyghur | Tangsa | Toto | Vithkuqi | Garay
-            | GurungKhema | KiratRai | OlOnal | Sunuwar | Todhri | TuluTigalari => {
-                HB_SCRIPT_INVALID
-            }
-        }
-    }
-}
-
 #[cfg(test)]
 mod test {
     use super::{get_script, Script};