parsemon2

A monadic parser combinator written purely in python

Project description

parsemon2

This is yet another attempt to bring monadic parsing to python. The problem the author saw with many other implementations is a limit to their composability. A lot of the times these otherwise quite well written implementations suffer pretty bad from pythons lack of TCO. This implementation uses trampolines to get around that.

Right now this implementation is nothing more but a toy, but the tests that come with this package show already that it’s parsing ability is not dependent on pythons recursion limit.

We also have error messages.

building the package

Building the package from source can be done in multiple ways.

building from sdist

You need to have the rust toolchain installed. Check out your GNU/Linux distribution to learn how to install it. Another handy resource to consider is https://www.rust-lang.org/tools/install.

Now you can build the package from source via pip:

pip install setuptools_rust wheel
pip wheel parsemon2 --no-binary :all:

Now you should have a wheel for your platform in your working directory.

build from the repository

The easiest way to build wheels from the git repository is to use docker since there is a handy build script included in the repo. Make sure the your user has access to docker. Consult the documentation of your system for more information on how to install docker.

With docker installed run the following in the root folder of the source code repository:

bin/build-wheels

After the program finishes you should find wheels for various python versions in the dist/ directory.

documentation

If you want to learn about the library we recommend checking out our readthedocs page.

Changes

3.1.0

Serious peformance improvements were made
Minor bug fix in json example parser

3.0.1

Update README

3.0

Remove pyrsistent deque implementation
Improve fmap performance
Implement end-of-input parser
run_parser now returns a ParsingResult object instead of the raw value of the supplied parser
run_parser won’t fail if the parser did not consume all of the supplied input
Got rid of NotEnouhInput exception.
Drop official support for Python 3.6
Change semantics of until parser.

2.0

Parsers constructed with do can now take arguments
New parser for floating point numbers: parsmon.basic.floating_point
Implement x | y operator for parsers, it is a short hand for choice(x,y)
Improved performance parsing speed by factor 4 - 6
There is now an example of a parser included in this package. It is the worlds slowest json parser

1.1

Implement validators
chain now accepts 1 or more arguments
Implement do notation
New whitespace parser
New parser for integers

Project details

Release history Release notifications | RSS feed

3.2.2

Apr 17, 2021

3.2.1

Apr 11, 2021

3.2.0

Apr 11, 2021

This version

3.1.1

Feb 10, 2021

3.1.0

Feb 10, 2021

3.0.1

Nov 8, 2019

3.0

Nov 8, 2019

2.2

Jan 4, 2019

2.1

Jan 4, 2019

2.0

Dec 28, 2018

1.1

Oct 10, 2018

1.0

Jul 14, 2018

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