template engine for hypermedia resources that provides a single DSL to generate several media types representations
Ruby
Latest commit 3ecab42 Aug 1, 2011 @nuxlli nuxlli upgrading to 1.2.1

README.md

Tokamak

Is a template engine for hypermedia resources that provides a single DSL to generate several media types representations.

This version supports json and xml generation (you can add other media types easily)

The lib provide hooks for:

Just put require "tokamak/hook/[sinatra|rails|tilt]" on your app. See unit tests for hook samples.

You are also able to implement hooks for other frameworks.

Sample

Tokamak code

collection(@some_articles) do |collection|
    collection.values do |values|
        values.id      "http://example.com/json"
        values.title   "Feed"
        values.updated Time.now

        values.author {
            values.name  "John Doe"
            values.email "joedoe@example.com"
        }

        values.author {
            values.name  "Foo Bar"
            values.email "foobar@example.com"
        }
    end

    collection.link("next"    , "http://a.link.com/next")
    collection.link("previous", "http://a.link.com/previous")

    collection.members(:root => "articles") do |member, article|
        member.values do |values|
            values.id      "uri:#{article[:id]}"
            values.title   article[:title]
            values.updated article[:updated]
        end

        member.link("image", "http://example.com/image/1")
        member.link("image", "http://example.com/image/2", :type => "application/json")
    end
end

Generates the following representations:

JSON

{
    "author": [{
        "name": "John Doe",
        "email": "joedoe@example.com"
    },
    {
        "name": "Foo Bar",
        "email": "foobar@example.com"
    }],
    "title": "Feed",
    "id": "http://example.com/json",
    "link": [{
        "href": "http://a.link.com/next",
        "rel": "next",
        "type": "application/json"
    },
    {
        "href": "http://a.link.com/previous",
        "rel": "previous",
        "type": "application/json"
    }],
    "articles": [{
        "title": "a great article",
        "id": "uri:1",
        "link": [{
            "href": "http://example.com/image/1",
            "rel": "image",
            "type": "application/json"
        },
        {
            "type": "application/json",
            "href": "http://example.com/image/2",
            "rel": "image",
            "type": "application/json"
        }],
        "updated": "2011-01-05T10:40:58-02:00"
    },
    {
        "title": "another great article",
        "id": "uri:2",
        "link": [{
            "href": "http://example.com/image/1",
            "rel": "image",
            "type": "application/json"
        },
        {
            "type": "application/json",
            "href": "http://example.com/image/2",
            "rel": "image",
            "type": "application/json"
        }],
        "updated": "2011-01-05T10:40:58-02:00"
    }],
    "updated": "2011-01-05T10:40:58-02:00"
}

XML

<?xml version="1.0"?>
<root>
  <id>http://example.com/json</id>
  <title>Feed</title>
  <updated>2011-01-05T10:40:58-02:00</updated>
  <author>
    <name>John Doe</name>
    <email>joedoe@example.com</email>
  </author>
  <author>
    <name>Foo Bar</name>
    <email>foobar@example.com</email>
  </author>
  <link href="http://a.link.com/next" rel="next" type="application/xml"/>
  <link href="http://a.link.com/previous" rel="previous" type="application/xml"/>
  <articles>
    <id>uri:1</id>
    <title>a great article</title>
    <updated>2011-01-05T10:40:58-02:00</updated>
    <link href="http://example.com/image/1" rel="image" type="application/xml"/>
    <link href="http://example.com/image/2" type="application/json" rel="image"/>
  </articles>
  <articles>
    <id>uri:2</id>
    <title>another great article</title>
    <updated>2011-01-05T10:40:58-02:00</updated>
    <link href="http://example.com/image/1" rel="image" type="application/xml"/>
    <link href="http://example.com/image/2" type="application/json" rel="image"/>
  </articles>
</root>

Other features

  • You can declare recipes once and reuse it later (see Tokamak::Recipes)
  • You can extend Tokamak::Builder::Base to support a custom media type.
  • You can customize the DSL entrypoint helpers, used by the hooks (see Tokamak::Builder::HelperTest)

Want to know more?

Please check the unit tests, you can see a lot of richer samples, including tests for the hooks.

This library was extracted from Restfulie and then heavy refactored. The same terms apply, see LICENSE.txt