icu_locale_core 2.3.0: icu_locale_core::LanguageIdentifier

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Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify icu_locale_core::LanguageIdentifier in pkg:cargo/icu_locale_core@2.3.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:cargo/icu_locale_core@2.3.0
Demonstrate these symbols/APIs:
  - icu_locale_core::LanguageIdentifier
Required runtime conditions:
  - ecosystem: golang
  - language: go
  - packageManager: go@1.26.6
  - runtime: go@1.26.6

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

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  "kind": "HOW",
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  "symbols": [
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  }
}

//! Clean-room verification sample for icu_locale_core.

pub use icu_locale_core::*;

use core::cmp::Ordering;
use icu_locale_core::{
    langid,
    subtags::{language, region, script, variant},
    LanguageIdentifier,
};
use std::str::FromStr;

fn main() {
    // 1. LanguageIdentifier parses well-formed BCP-47 language identifiers and rejects invalid syntax with ParseError
    let parsed = LanguageIdentifier::try_from_str("en-US");
    assert!(parsed.is_ok());
    let lid = parsed.unwrap();
    assert_eq!(lid.to_string(), "en-US");

    let from_str_parsed = LanguageIdentifier::from_str("zh-Hant-TW");
    assert!(from_str_parsed.is_ok());
    assert_eq!(from_str_parsed.unwrap().to_string(), "zh-Hant-TW");

    let from_utf8_parsed = LanguageIdentifier::try_from_utf8(b"fr-CA");
    assert!(from_utf8_parsed.is_ok());
    assert_eq!(from_utf8_parsed.unwrap().to_string(), "fr-CA");

    let invalid_subtag = LanguageIdentifier::try_from_str("toolongsubtag12345");
    assert!(invalid_subtag.is_err());
    let empty_tag = LanguageIdentifier::try_from_str("");
    assert!(empty_tag.is_err());

    // 2. LanguageIdentifier extracts language, script, region, and variant subtags accurately
    let full_lid: LanguageIdentifier = "en-Latn-US-macos".parse().expect("valid langid");
    assert_eq!(full_lid.language, language!("en"));
    assert_eq!(full_lid.language.as_str(), "en");
    assert_eq!(full_lid.script, Some(script!("Latn")));
    assert_eq!(full_lid.script.unwrap().as_str(), "Latn");
    assert_eq!(full_lid.region, Some(region!("US")));
    assert_eq!(full_lid.region.unwrap().as_str(), "US");
    assert_eq!(full_lid.variants.len(), 1);
    assert_eq!(full_lid.variants.first(), Some(&variant!("macos")));
    assert_eq!(full_lid.variants.first().unwrap().as_str(), "macos");

    // 3. langid macro constructs LanguageIdentifier instances at compile time with normalized casing
    const CONST_EN_US: LanguageIdentifier = langid!("en-us");
    assert_eq!(CONST_EN_US.to_string(), "en-US");
    assert_eq!(CONST_EN_US.language, language!("en"));
    assert_eq!(CONST_EN_US.region, Some(region!("US")));

    const UNKNOWN_LID: LanguageIdentifier = langid!("und");
    assert!(UNKNOWN_LID.is_unknown());
    assert_eq!(UNKNOWN_LID, LanguageIdentifier::UNKNOWN);
    assert!(!CONST_EN_US.is_unknown());

    // 4. LanguageIdentifier normalizes casing and strips locale extensions via try_from_locale_bytes
    let normalized = LanguageIdentifier::normalize("pL-lAtN-pL");
    assert!(normalized.is_ok());
    assert_eq!(normalized.unwrap(), "pl-Latn-PL");

    let from_locale = LanguageIdentifier::try_from_locale_bytes(b"en-US-u-ca-buddhist");
    assert!(from_locale.is_ok());
    assert_eq!(from_locale.unwrap(), CONST_EN_US);

    // 5. LanguageIdentifier supports normalizing equality, strict byte comparison, and total struct ordering
    assert!(full_lid.normalizing_eq("EN-latn-us-MACOS"));
    assert!(!full_lid.normalizing_eq("en-Latn-GB"));

    assert_eq!(CONST_EN_US.strict_cmp(b"en-US"), Ordering::Equal);
    assert_eq!(CONST_EN_US.strict_cmp(b"ar-SA"), Ordering::Greater);
    assert_eq!(CONST_EN_US.strict_cmp(b"zh-TW"), Ordering::Less);

    let mut list = vec![
        langid!("zh-TW"),
        langid!("ar-SA"),
        langid!("en-US"),
    ];
    list.sort_by(LanguageIdentifier::total_cmp);
    assert_eq!(list[0], langid!("ar-SA"));
    assert_eq!(list[1], langid!("en-US"));
    assert_eq!(list[2], langid!("zh-TW"));

    // 6. LanguageIdentifier converts to and from language, script, and region subtag tuples
    let lsr_tuple: (
        icu_locale_core::subtags::Language,
        Option<icu_locale_core::subtags::Script>,
        Option<icu_locale_core::subtags::Region>,
    ) = (&CONST_EN_US).into();
    assert_eq!(lsr_tuple.0, language!("en"));
    assert_eq!(lsr_tuple.1, None);
    assert_eq!(lsr_tuple.2, Some(region!("US")));

    let rebuilt = LanguageIdentifier::from(lsr_tuple);
    assert_eq!(rebuilt, CONST_EN_US);

    let from_lang_only = LanguageIdentifier::from(language!("ja"));
    assert_eq!(from_lang_only, langid!("ja"));

    println!("All icu_locale_core::LanguageIdentifier contract assertions passed successfully.");
}