Dachsfisch

This gem offers a Ruby implementation of the BadgerFish standard, a set of rules for converting documents between the XML and JSON format. This gem supports conversion in both directions, specifically XML-to-JSON and JSON-to-XML.

The rules for converting XML documents to JSON using Badgerfish are:

• Element names become object properties.
• Text content of elements goes in the $ property of an object.
• Nested elements become nested properties.
• Multiple elements at the same level become array elements.
• Attributes go in properties whose names begin with @.
• Active namespaces for an element go in the element's @xmlns property.
• The default namespace URI goes in @xmlns.$.
• Other namespaces go in other properties of @xmlns.
• Elements with namespace prefixes become object properties, too.
• The @xmlns property goes only in objects relative to the tag where namespace was declared.
• Text fragments in mixed contents (tags and text) become properties named $1, $2, etc.
• Comment tags, similar to text fragments, become properties named !1, !2, etc.
• CDATA sections become properties named #1, #2, etc.

Please see our examples for more details. Those rules are derived from this list. Own additions:

• The order of nodes gets saved in @@order (JSON is unordered per definition)

Installation

Add this line to your application's Gemfile:

gem 'dachsfisch', github: 'openHPI/dachsfisch'

And then execute:

$ bundle

Note: Removing support for ancient Ruby or Rails versions will not result in a new major. Please be extra careful when using ancient Ruby or Rails versions and updating gems.

Usage

Based on the desired conversion, use one of the following classes. In both cases, the input is expected to be a valid string.

XML-to-JSON

xml = '<alice>bob</alice>'
json = Dachsfisch::XML2JSONConverter.perform(xml: xml)

JSON-to-XML

json = '{ "alice": { "$1": "bob", "@@order": ["$1"] }, "@@order": ["alice"] }'
xml = Dachsfisch::JSON2XMLConverter.perform(json: json)

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. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and the created tag, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/openHPI/dachsfisch. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the code of conduct.

License

The gem is available as open source under the terms of the MIT License.

Code of Conduct

Everyone interacting in this project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.