logosky 0.2.0

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<h1>LogoSky</h1>
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A seamless integration layer between [Logos](https://github.com/maciejhirsz/logos) and [Chumsky](https://github.com/zesterer/chumsky) parser combinator, providing zero-copy `TokenStream` adapter and `Parseable` trait for building robust parsers

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[<img alt="crates.io" src="https://img.shields.io/crates/d/logosky?color=critical&logo=data:image/svg+xml;base64,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&style=for-the-badge" height="22">][crates-url]
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English | [简体中文][zh-cn-url]

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## Overview

**LogoSky** is a Rust library that bridges [Logos](https://github.com/maciejhirsz/logos) and [Chumsky](https://github.com/zesterer/chumsky), combining the speed of Logos' lexical analysis with the expressiveness of Chumsky's parser combinators. It provides a seamless integration layer that allows you to use Logos for tokenization and Chumsky for parsing in a unified, type-safe manner.

## Features

- 🚀 **High-performance tokenization** with Logos
- 🎯 **Expressive parser combinators** with Chumsky
- 🔗 **Seamless integration** via `TokenStream` adapter
- 📍 **Rich span tracking** with `Span` and `Spanned` types
- 🎨 **Flexible parseable trait** for building composable parsers
- 🔧 **No-std support** with optional allocator
- 🧩 **Multiple source types** support (`str`, `[u8]`, `Bytes`, `BStr`, `HipStr`)
- ⚡ **Zero-cost abstractions** for efficient parsing

## Installation

Add this to your `Cargo.toml`:

```toml
[dependencies]
logosky = "0.2"
```

### Feature Flags

- `std` (default) - Enable standard library support
- `alloc` - Enable allocator support for no-std environments
- `bytes` - Support for `bytes::Bytes` as token source
- `bstr` - Support for `bstr::BStr` as token source
- `hipstr` - Support for `hipstr::HipStr` as token source
- `either` - Enable `Either<L, R>` parseable support
- `among` - Enable `Among<L, M, R>` parseable support
- `smallvec` - Enable small vector optimization utilities

## Core Components

- `TokenStream<'a, T>`

  An zero-copy adapter that bridges Logos lexer output to Chumsky parser input. Implements Chumsky's `Input`, `ValueInput`, `SliceInput`, and `ExactSizeInput` traits.

- `Token<'a>` Trait

  The core trait for defining tokens. Requires:

  - `Char`: Character type (usually `char` or `u8`)
  - `Kind`: Token kind discriminator
  - `Logos`: Associated Logos token enum

- `LosslessToken<'a>` Trait

  Extends `Token<'a>` for tokens that preserve all source information, including trivia (whitespace, comments).

  - Provides `is_trivia()` method to identify non-semantic tokens
  - Essential for building formatters, linters, and language servers that need to preserve formatting
  - Works seamlessly with `Tokenizer` trivia handling utilities

- `Tokenizer<'a, T>` Trait

  Provides parser combinators for working with token streams:

  - `skip_trivias()`: Skip over trivia tokens (whitespace, comments)
  - `collect_trivias()`: Collect trivia tokens into a container for later processing

- `Parseable<'a, I, T, Error>` Trait

  A trait for types that can be parsed from a token stream. Implement this to create composable parsers.

- `Span` and `Spanned<T>`

  - `Span`: Lightweight span tracking (start/end positions)
  - `Spanned<T>`: Wraps a value with its source span

- Utility Traits

  - `IsAsciiChar`: ASCII character checking utilities
  - `AsSpan` / `IntoSpan`: Span access traits
  - `IntoComponents`: Destructure parsed elements

## Who uses `logosky`?

- [`smear`](https://github.com/al8n/smear): Blazing fast, fully spec-compliant, reusable parser combinators for standard GraphQL and GraphQL-like DSLs.

## License

`logosky` is dual-licensed under:

- MIT License ([LICENSE-MIT](LICENSE-MIT))
- Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE))

You may choose either license for your purposes.

Copyright (c) 2025 Al Liu.

[Github-url]: https://github.com/al8n/logosky/
[CI-url]: https://github.com/al8n/logosky/actions/workflows/ci.yml
[doc-url]: https://docs.rs/logosky
[crates-url]: https://crates.io/crates/logosky
[codecov-url]: https://app.codecov.io/gh/al8n/logosky/
[zh-cn-url]: https://github.com/al8n/logosky/tree/main/README-zh_CN.md