Initial implementation

.github/workflows/main.yml

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+name: Ruby
+
+on:
+  push:
+    branches:
+      - master
+
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        ruby:
+          - "3.0"
+          - "2.7"
+          - "2.6"
+          - "jruby"
+          - "truffleruby"
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby }}
+        bundler-cache: true
+    - name: Run RSpec
+      run: bundle exec rspec

.gitignore

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+/.bundle/
+/.yardoc
+/_yardoc/
+/coverage/
+/doc/
+/pkg/
+/spec/reports/
+/tmp/
+
+# rspec failure tracking
+.rspec_status
+
+Gemfile.lock

.rspec

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+--format documentation
+--color
+--require spec_helper

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog],
+and this project adheres to [Semantic Versioning].
+
+## [Unreleased]
+
+## [0.1.0]
+
+### Added
+
+- Initial implementation. ([@skryukov])
+
+[@skryukov]: https://github.com/skryukov
+
+[Unreleased]: https://github.com/skryukov/paco/compare/v0.1.0...HEAD
+[0.1.0]: https://github.com/skryukov/paco/commits/v0.1.0
+
+[Keep a Changelog]: https://keepachangelog.com/en/1.0.0/
+[Semantic Versioning]: https://semver.org/spec/v2.0.0.html

Gemfile

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+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+# Specify your gem's dependencies in paco.gemspec
+gemspec
+
+gem "rake", "~> 13.0"
+gem "rspec", "~> 3.0"
+gem "simplecov", require: false
+gem "standard"

LICENSE.txt

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+The MIT License (MIT)
+
+Copyright (c) 2021 Svyatoslav Kryukov
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

README.md

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+# Paco
+
+Paco is a parser combinator library inspired by Haskell's [Parsec] and [Parsimmon].
+
+## Installation
+
+Add this line to your application's Gemfile:
+
+```ruby
+gem "paco"
+```
+
+And then execute:
+
+    $ bundle install
+
+Or install it yourself as:
+
+    $ gem install paco
+
+## Usage
+
+See [API documentation](docs/paco.md), [examples](examples) and [specs](spec).
+
+## Development
+
+After checking out the repo, run `bin/setup` to install dependencies. Then, run `bundle exec rspec` to run the tests. You can also run `bin/console` for an interactive prompt that will allow you to experiment.
+
+To install this gem onto your local machine, run `bundle exec rake install`.
+
+## Contributing
+
+Bug reports and pull requests are welcome on GitHub at https://github.com/skryukov/paco.
+
+## License
+
+The gem is available as open source under the terms of the [MIT License].
+
+[MIT License]: https://opensource.org/licenses/MIT
+[Parsec]: https://github.com/haskell/parsec
+[Parsimmon]: https://github.com/jneen/parsimmon
+[parsby]: https://github.com/jolmg/parsby

Rakefile

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+# frozen_string_literal: true
+
+require "bundler/gem_tasks"
+require "rspec/core/rake_task"
+
+RSpec::Core::RakeTask.new(:spec)
+
+task default: :spec

bin/console

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+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+require "bundler/setup"
+require "paco"
+
+# You can add fixtures and/or initialization code here to make experimenting
+# with your gem easier. You can also use a different console, if you like.
+
+# (If you use this, don't forget to add pry to your Gemfile!)
+# require "pry"
+# Pry.start
+
+require "irb"
+IRB.start(__FILE__)

bin/setup

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+#!/usr/bin/env bash
+set -euo pipefail
+IFS=$'\n\t'
+set -vx
+
+bundle install
+
+# Do any other automated setup that you need to do here