Temml for Ruby

temml-ruby is a fork of katex-ruby, focusing on the support of Temml instead of KaTeX.

This rubygem enables you to render TeX math to MathML using Temml. It uses ExecJS under the hood.

Installation

Add this line to your application's Gemfile:

gem 'temml', '~> 0.18.0', :github => 'sudotac/temml-ruby'

And then execute:

$ bundle

Or install it yourself with specific_install rubygem as:

$ gem specific_install -t v0.18.0 https://github.com/sudotac/temml-ruby.git

Usage

Render some math:

Temml.render('c = \\pm\\sqrt{a^2 + b^2}')
=> "<math><mrow><mi>c</mi><mo>=</mo></mrow><mrow><mo>±</mo></mrow><mrow><msqrt><mrow><msup><mi>a</mi><mn>2</mn></msup><mo>+</mo><msup><mi>b</mi><mn>2</mn></msup></mrow></msqrt></mrow></math>"

If you're on Rails, the result is marked as html_safe.

Any error in the markup is raised by default. To avoid this and render error text instead, pass throw_on_error: false:

Temml.render '\\', throw_on_error: false
=> "<span class=\"temml-error\" style=\"color:#b22222;white-space:pre-line;\">\\\nParseError:  Unexpected character: &#x27;\\&#x27; at position 1: \\̲</span>"

Note that this will catch even ParseErrors (unlike native Temml).

Assets

For this rendered math to look nice, you will also need to include Temml CSS and web fonts into the webpage.

I recommend you use the CSS bundled with this gem, to ensure version compatibility.

You also need to include the appropriate web fonts for the CSS you have chosen to use. Please refer to Temml's documentation for details.

Automatic registrations

If you use Rails, Sprockets without Rails, or Hanami, the assets are registered automatically.

For example, if you want to use Latin Modern font, //= require Temml-Latin-Modern if you use CSS or @import "_Temml-Latin-Modern" if you use Sass.

You can also //= require temml in your JS to access the Temml renderer in the browser.

Manual registration

The assets are located in the vendor/assets directory of the gem. The root path to the root directory of the gem is available via Temml.gem_path, e.g.:

File.join(Temml.gem_path, 'vendor', 'assets')

Temml version

The version of Temml bundled with this gem is available via:

Temml::TEMML_VERSION

Caching

If you cache the output of Temml.render, make sure to use the Temml version in the cache key, as the output may change between versions.

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec 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/sudotac/temml-ruby.

This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

License

This gem is based on katex-ruby and my contribution is tiny and trivial, so I will make this gem available under the terms of CC0 1.0 Universal.

Note that you should still have to follow the licenses of katex-ruby, Temml and KaTeX, which are distributed under the terms of the MIT License. See the license files in the license directory.