tinystr 0.8.4: tinystr

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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 tinystr in pkg:cargo/tinystr@0.8.4
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:cargo/tinystr@0.8.4
Demonstrate these symbols/APIs:
  - tinystr

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 tinystr.

pub use tinystr::*;

use tinystr::{tinystr, ParseError, TinyAsciiStr};

fn main() {
    // 1. tinystr macro constructs TinyAsciiStr at compile time for bounded ASCII literals
    let lit4: TinyAsciiStr<4> = tinystr!(4, "rust");
    assert_eq!(lit4.as_str(), "rust");
    assert_eq!(lit4.len(), 4);
    assert!(!lit4.is_empty());

    let lit8 = tinystr!(8, "tinystr");
    assert_eq!(lit8.as_str(), "tinystr");
    assert_eq!(lit8.len(), 7);

    let lit16 = tinystr!(16, "sixteenchars1234");
    assert_eq!(lit16.as_str(), "sixteenchars1234");
    assert_eq!(lit16.len(), 16);

    let empty: TinyAsciiStr<4> = TinyAsciiStr::EMPTY;
    assert_eq!(empty.as_str(), "");
    assert_eq!(empty.len(), 0);
    assert!(empty.is_empty());

    // 2. TinyAsciiStr parses valid ASCII strings and rejects oversized or non-ASCII input with ParseError
    let parsed: Result<TinyAsciiStr<4>, ParseError> = TinyAsciiStr::try_from_str("code");
    assert!(parsed.is_ok());
    assert_eq!(parsed.unwrap().as_str(), "code");

    let too_long: Result<TinyAsciiStr<4>, ParseError> = TinyAsciiStr::try_from_str("toolong");
    assert_eq!(too_long, Err(ParseError::TooLong { max: 4, len: 7 }));

    let non_ascii: Result<TinyAsciiStr<8>, ParseError> = TinyAsciiStr::try_from_str("café");
    assert_eq!(non_ascii, Err(ParseError::NonAscii));

    let contains_null: Result<TinyAsciiStr<4>, ParseError> = TinyAsciiStr::try_from_utf8(b"a\0b");
    assert_eq!(contains_null, Err(ParseError::ContainsNull));

    // 3. TinyAsciiStr converts ASCII strings between lowercase, uppercase and titlecase
    let mixed: TinyAsciiStr<8> = tinystr!(8, "tEsT-42");
    let lower = mixed.to_ascii_lowercase();
    assert_eq!(lower.as_str(), "test-42");

    let upper = mixed.to_ascii_uppercase();
    assert_eq!(upper.as_str(), "TEST-42");

    let title_input: TinyAsciiStr<8> = tinystr!(8, "hello");
    let title = title_input.to_ascii_titlecase();
    assert_eq!(title.as_str(), "Hello");

    // 4. TinyAsciiStr classifies strings as alphabetic, numeric and alphanumeric
    let alpha: TinyAsciiStr<8> = tinystr!(8, "alpha");
    assert!(alpha.is_ascii_alphabetic());
    assert!(alpha.is_ascii_alphanumeric());
    assert!(!alpha.is_ascii_numeric());

    let num: TinyAsciiStr<8> = tinystr!(8, "12345");
    assert!(!num.is_ascii_alphabetic());
    assert!(num.is_ascii_alphanumeric());
    assert!(num.is_ascii_numeric());

    let alphanum: TinyAsciiStr<8> = tinystr!(8, "rust2021");
    assert!(!alphanum.is_ascii_alphabetic());
    assert!(alphanum.is_ascii_alphanumeric());
    assert!(!alphanum.is_ascii_numeric());

    let symbol_str: TinyAsciiStr<8> = tinystr!(8, "a-b_c");
    assert!(!symbol_str.is_ascii_alphanumeric());

    // 5. TinyAsciiStr supports equality and ordering comparisons against str slices and other TinyAsciiStr instances
    let str_a: TinyAsciiStr<4> = tinystr!(4, "abcd");
    let str_b: TinyAsciiStr<4> = tinystr!(4, "abce");
    let str_same: TinyAsciiStr<4> = tinystr!(4, "abcd");

    assert_eq!(str_a, "abcd");
    assert_ne!(str_a, "abce");
    assert_eq!(str_a, str_same);
    assert_ne!(str_a, str_b);
    assert!(str_a < str_b);
    assert!(str_b > str_a);

    println!("All tinystr contract assertions passed successfully.");
}