vendor/icu_locid_transform/src/provider/canonicalizer.rs

// This file is part of ICU4X. For terms of use, please see the file
// called LICENSE at the top level of the ICU4X source tree
// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).

use super::*;
use icu_locid::subtags::{Language, Region, Script, Variant};
use icu_provider::prelude::*;
use tinystr::UnvalidatedTinyAsciiStr;
use zerovec::{VarZeroVec, ZeroMap, ZeroSlice};

#[icu_provider::data_struct(marker(AliasesV1Marker, "locid_transform/aliases@1", singleton))]
#[derive(PartialEq, Clone, Default)]
#[cfg_attr(
    feature = "datagen",
    derive(serde::Serialize, databake::Bake),
    databake(path = icu_locid_transform::provider),
)]
#[cfg_attr(feature = "serde", derive(serde::Deserialize))]
#[yoke(prove_covariance_manually)]
/// This alias data is used for locale canonicalization. Each field defines a
/// mapping from an old identifier to a new identifier, based upon the rules in
/// from <http://unicode.org/reports/tr35/#LocaleId_Canonicalization>. The data
/// is stored in sorted order, allowing for binary search to identify rules to
/// apply. It is broken down into smaller vectors based upon some characteristic
/// of the data, to help avoid unnecessary searches. For example, the `sgn_region`
/// field contains aliases for sign language and region, so that it is not
/// necessary to search the data unless the input is a sign language.
///
/// The algorithm in tr35 is not guaranteed to terminate on data other than what
/// is currently in CLDR. For this reason, it is not a good idea to attempt to add
/// or modify aliases for use in this structure.
///
/// <div class="stab unstable">
/// 🚧 This code is considered unstable; it may change at any time, in breaking or non-breaking ways,
/// including in SemVer minor releases. While the serde representation of data structs is guaranteed
/// to be stable, their Rust representation might not be. Use with caution.
/// </div>
// TODO: Use validated types as value types
#[derive(Debug)]
pub struct AliasesV1<'data> {
    /// `[language(-variant)+\] -> [langid]`
    /// This is not a map as it's searched linearly according to the canonicalization rules.
    #[cfg_attr(feature = "serde", serde(borrow))]
    pub language_variants: VarZeroVec<'data, UnvalidatedLanguageIdentifierPair>,
    /// `sgn-[region] -> [language]`
    #[cfg_attr(feature = "serde", serde(borrow))]
    pub sgn_region: ZeroMap<'data, UnvalidatedRegion, Language>,
    /// `[language{2}] -> [langid]`
    #[cfg_attr(feature = "serde", serde(borrow))]
    pub language_len2: ZeroMap<'data, UnvalidatedTinyAsciiStr<2>, UnvalidatedLanguageIdentifier>,
    /// `[language{3}] -> [langid]`
    #[cfg_attr(feature = "serde", serde(borrow))]
    pub language_len3: ZeroMap<'data, UnvalidatedLanguage, UnvalidatedLanguageIdentifier>,
    /// `[langid] -> [langid]`
    /// This is not a map as it's searched linearly according to the canonicalization rules.
    #[cfg_attr(feature = "serde", serde(borrow))]
    pub language: VarZeroVec<'data, UnvalidatedLanguageIdentifierPair>,

    /// `[script] -> [script]`
    #[cfg_attr(feature = "serde", serde(borrow))]
    pub script: ZeroMap<'data, UnvalidatedScript, Script>,

    /// `[region{2}] -> [region]`
    #[cfg_attr(feature = "serde", serde(borrow))]
    pub region_alpha: ZeroMap<'data, UnvalidatedTinyAsciiStr<2>, Region>,
    /// `[region{3}] -> [region]`
    #[cfg_attr(feature = "serde", serde(borrow))]
    pub region_num: ZeroMap<'data, UnvalidatedRegion, Region>,

    /// `[region] -> [region]+`
    #[cfg_attr(feature = "serde", serde(borrow))]
    pub complex_region: ZeroMap<'data, UnvalidatedRegion, ZeroSlice<Region>>,

    /// `[variant] -> [variant]`
    #[cfg_attr(feature = "serde", serde(borrow))]
    pub variant: ZeroMap<'data, UnvalidatedVariant, Variant>,

    /// `[value{7}] -> [value{7}]`
    #[cfg_attr(feature = "serde", serde(borrow))]
    pub subdivision: ZeroMap<'data, UnvalidatedSubdivision, SemivalidatedSubdivision>,
}