Ruby gem (native extension in Rust) providing implementations of various string metrics. Current metrics supported are: Sørensen–Dice, Levenshtein, Damerau–Levenshtein, Jaro & Jaro–Winkler. Strings that are UTF-8 encodable (convertible to UTF-8 representation) are supported. All comparison of strings is done at the grapheme cluster level as described by Unicode Standard Annex #29; this may be different from many gems that calculate string metrics. See here for known compatibility.

Install Rust (tested with version >= 1.47.0) with:

curl https://sh.rustup.rs -sSf | sh

3.1, 3.0, 2.7, 2.6, 2.5, 2.4, 2.3, jruby, truffleruby

1.60.0, 1.59.0, 1.58.1, 1.57.0, 1.56.1, 1.55.0, 1.54.0, 1.53.0, 1.52.1, 1.51.0, 1.50.0, 1.49.0, 1.48.0, 1.47.0

Linux, MacOS, Windows

Add this line to your application's Gemfile:

gem 'str_metrics'

And then execute:

$ bundle install

$ gem install str_metrics

All you need to do to use the metrics provided in this gem is to make sure str_metrics is required like:

require 'str_metrics'

Each metric is shown below with an example & meanings of optional parameters.

StrMetrics::SorensenDice.coefficient('abc', 'bcd', ignore_case: false)
 => 0.5

Options:

StrMetrics::Levenshtein.distance('abc', 'acb', ignore_case: false)
 => 2

Options:

StrMetrics::DamerauLevenshtein.distance('abc', 'acb', ignore_case: false)
 => 1

Options:

StrMetrics::Jaro.similarity('abc', 'aac', ignore_case: false)
 => 0.7777777777777777

Options:

StrMetrics::JaroWinkler.similarity('abc', 'aac', ignore_case: false, prefix_scaling_factor: 0.1, prefix_scaling_bonus_threshold: 0.7)
 => 0.7999999999999999

StrMetrics::JaroWinkler.distance('abc', 'aac', ignore_case: false, prefix_scaling_factor: 0.1, prefix_scaling_bonus_threshold: 0.7)
 => 0.20000000000000007

Options:

The main motivation was to have a central gem which can provide a variety of string metric calculations. Secondary motivation was to experiment with writing a native extension in Rust (instead of C).

gem install bundler
git clone https://github.com/anirbanmu/str_metrics.git
cd ./str_metrics
bundle install

rake rust_build

rake spec

rake install

To deploy a new version of the gem to rubygems:

1. Bump version in version.rb according to SemVer.
2. Get your code merged to main branch
3. After a git pull on main branch:

rake build && rake release

• Anirban Mukhopadhyay

See all repo contributors here.

SemVer is employed. See tags for released versions.

Bug reports and pull requests are welcome on GitHub at https://github.com/anirbanmu/str_metrics.

Everyone interacting in this project's codebase, issue trackers etc. are expected to follow the code of conduct.

This project is licensed under the MIT License - see the LICENSE file for details