81 lines
3.1 KiB
Markdown
81 lines
3.1 KiB
Markdown
# Contributing
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Everybody is more than welcome to contribute to Oga, no matter how small the
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change. To keep everything running smoothly there are a few guidelines that one
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should follow. These are as following:
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* When changing code make sure to write RSpec tests for the changes.
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* Document code using YARD. At the very least the method arguments and return
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value(s) should be documented.
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* Wrap lines at 80 characters per line.
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* Git commits should have a <= 50 character summary, optionally followed by a
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blank line and a more in depth description of 80 characters per line.
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## Editor Setup
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Whatever editor you use doesn't matter as long as it can do two things:
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* Use spaces for indentation.
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* Hard wrap lines at 80 characters per line.
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To make this process easier Oga comes with an [EditorConfig][editorconfig]
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configuration file. If your editor supports this it will automatically apply
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the required settings for you.
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## Hacking on Oga
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Assuming you have a local Git clone of Oga, the first step should be to install
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all the required Gems:
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bundle install
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Next up, compile the required files and run the tests:
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rake
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You can compile the various parsers/extensions by running:
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rake generate
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For more information about the available tasks, run `rake -T`.
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## Extension Setup
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Oga uses native extensions for the XML lexer. This is due to Ruby sadly not
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being fast enough to chew through large amounts of XML (at least when using
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Ragel). For example, the benchmark `benchmark/lexer/big_xml_time.rb` would take
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around 6 seconds to complete on MRI 2.1.1. The native extensions on the other
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hand can complete this benchmark in roughly 600 milliseconds.
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Oga has two native extensions: one for MRI/Rubinius (written in C) and one for
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JRuby (written in Java). Both extensions share the same Ragel grammar, found in
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`ext/ragel/base_lexer.rl`. This grammar is set up in such a way that the syntax
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is compatible with both C and Java. Specific details on how the grammar is used
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can be found in the documentation of said grammar file.
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The native extensions call back in to Ruby to actually perform the task of
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creating tokens, validating input and so forth. As a result of this you'll most
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likely never have to touch the C and/or Java code when changing the behaviour
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of the lexer.
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To compile the extensions run `rake generate` using your Ruby implementation of
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choice. Note that extensions compiled for MRI can not be used on Rubinius and
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vice-versa. To compile the JRuby extension you'll have to switch your active
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Ruby version to JRuby first.
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## Contact
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In case you have any further questions or would like to receive feedback before
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submitting a change, feel free to contact me. You can either open an issue,
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send a tweet to [@yorickpeterse][twitter] or send an Email to
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<yorickpeterse@gmail.com>.
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## Legal
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By contributing to Oga you agree with both the Developer's Certificate of
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origin, found in `doc/DCO.md` and the license, found in `LICENSE`. This applies
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to all content in this repository unless stated otherwise.
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[editorconfig]:http://editorconfig.org/
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[twitter]: https://twitter.com/yorickpeterse
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