https://github.com/lark-parser/lark_cython

Cython plugin for Lark, reimplementing the LALR parser & lexer for better performance
https://github.com/lark-parser/lark_cython

Last synced: 4 days ago
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Cython plugin for Lark, reimplementing the LALR parser & lexer for better performance

• Host: GitHub
• URL: https://github.com/lark-parser/lark_cython
• Owner: lark-parser
• License: mit
• Created: 2022-01-26T09:13:29.000Z (almost 3 years ago)
• Default Branch: master
• Last Pushed: 2024-02-25T06:36:58.000Z (9 months ago)
• Last Synced: 2024-05-01T09:39:46.084Z (7 months ago)
• Language: Cython
• Homepage:
• Size: 45.9 KB
• Stars: 44
• Watchers: 4
• Forks: 5
• Open Issues: 7
• Metadata Files:
  • Readme: README.md
  • Funding: .github/FUNDING.yml
  • License: LICENSE

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README

        
# Lark-Cython

Cython plugin for [Lark](https://github.com/lark-parser/lark), reimplementing the LALR parser & lexer for better performance on CPython.

Install:

```python

pip install lark-cython

```

Usage:

```python

import lark_cython

parser = Lark(grammar, parser="lalr", _plugins=lark_cython.plugins)

# Use Lark as you usually would, with a huge performance boost

```

See the [examples](https://github.com/lark-parser/lark_cython/tree/master/examples) for more.

## Differences from Lark

- `Token` instances do not inherit from `str`. You must use the `value` attribute to get the string.

## Other caveats

- Postlexer isn't currently implemented

## Speed

In current benchmarks, lark-cython is about 50% to 80% faster than Lark.

We're still in the early stages, and in the future, lark-cython might go a lot faster.

## Other

License: MIT

Author: [Erez Shinan](https://github.com/erezsh/)

Special thanks goes to [Datafold](https://github.com/datafold) for commissioning the draft for lark-cython, and allowing me to release it as open-source.