Fast Parse VS Lark

Compare Fast Parse vs Lark and see what are their differences.

Fast Parse

Writing Fast Parsers Fast in Scala (by lihaoyi)

Lark

Lark is a parsing toolkit for Python, built with a focus on ergonomics, performance and modularity. (by lark-parser)
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Fast Parse Lark
2 15
980 2,969
0.2% 3.1%
4.9 9.2
2 months ago 3 days ago
Scala Python
MIT License MIT License
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.

Fast Parse

Posts with mentions or reviews of Fast Parse. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2021-12-17.
  • -🎄- 2021 Day 18 Solutions -🎄-
    144 projects | reddit.com/r/adventofcode | 17 Dec 2021
    Mostly a mess of pattern matching. I really need to make some generic tree utilities. Haven't been able to find a decent parser combinator that works in Scala 3 (I usually use fastparse which depends heavily on Scala 2 macros, and scala-parser-combinators works in Scala 3, but I've had a lot of trouble getting it to not be too greedy), so I used the state monad from cats to parse at the bottom of the file, which I think turned out fairly nice.
  • Parser generators vs. handwritten parsers: surveying major languages in 2021
    11 projects | news.ycombinator.com | 21 Aug 2021
    Agreed! I would say that parser combinators are the sweet spot and the right choice in most cases.

    Scala has them as well, e.g.: https://com-lihaoyi.github.io/fastparse/

    And the good thing is, you don't have to learn a completely new language/syntax, you can use the host language's syntax and you have full IDE support as well.

Lark

Posts with mentions or reviews of Lark. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2021-11-29.

What are some alternatives?

When comparing Fast Parse and Lark you can also consider the following projects:

PLY - Python Lex-Yacc

pyparsing - Python library for creating PEG parsers [Moved to: https://github.com/pyparsing/pyparsing]

pydantic - Data parsing and validation using Python type hints

sqlparse - A non-validating SQL parser module for Python

Scala Parser Combinators - simple combinator-based parsing for Scala. formerly part of the Scala standard library, now a separate community-maintained module

Parboiled2 - A macro-based PEG parser generator for Scala 2.10+

Atoma - Atom, RSS and JSON feed parser for Python 3

atto - friendly little parsers

Scopt - command line options parsing for Scala

Kaitai Struct - Kaitai Struct: declarative language to generate binary data parsers in C++ / C# / Go / Java / JavaScript / Lua / Perl / PHP / Python / Ruby

Pygments

汉字拼音转换工具(Python 版) - 汉字转拼音(pypinyin)