datatype-expansion

RAML Data Type Expansion

Often, tools need the full expansion of RAML data types where there are no references. This module gives you a utility tool to expand a given type and create a canonical form.

Installation

NPM

npm install datatype-expansion

Developer Environment

To run this project and build the different packages for Java or Javascript, you need to install leiningen. You can use homebrew for that.

brew install leiningen

RAML type expanded form

The RAML expanded form for a RAML type, resolves references and fills missing information to compute a fully expanded representation of the type. The form and the algorithm to compute is documented here.

Usage Clojure

The Clojure interface for the library offers a function to compute the expanded form using the datatype-expansion.expanded-form/expanded-form function. The function accepts an in-memory representation of the RAML type (keywordize) and a map from type names to types with the same representation. It returns the expanded form.

The following example shows a usage example:

;; A type context with some types definitions
(def types-context {"Songs.Song" {:properties {:title "string"
                                               :length "number"}}
                    "Songs.Album" {:properties {:title "string"
                                                :songs "Songs.Song[]"}}})

(is (= (datatype-expansion.expanded-form/expanded-form (get types-context "Songs.Album") types-context)
       {:type "object"
        :properties
        {"title" {:type "string" :required true}
         "songs" {:type "array"
                  :items {:type "object"
                          :properties
                          {"title"  {:type "string" :required true}
                           "length" {:type "number" :required true}}
                          :additionalProperties true
                          :required true}
                  :required true}}
        :additionalProperties true
        :required true}))

Usage Node.js

The Node.js interface for the library offers the expandedForm function to compute the expanded form. It accepts an in-memory JSON representation of the type, the types mapping and a callback function. If the invocation succeeds, it will return the expanded form as an argument to the provided callback function.

var tools = require("datatype-expansion");

var typesContext = {"Songs.Song": {"properties": {"title": "string",
                                                 "length": "number"}},
                    "Songs.Album": {"properties": {"title": "string",
                                                   "songs": "Songs.Song[]"}}};
tools.expandedForm(typesContext["Songs.Album"], typesContext, function(err, expanded) {
  // expanded contains the computed expanded form
  //{
  //  "properties": {
  //    "title": {
  //      "type": "string",
  //      "required": true
  //    },
  //    "songs": {
  //      "type": "array",
  //      "items": {
  //        "properties": {
  //          "title": {
  //            "type": "string",
  //            "required": true
  //          },
  //          "length": {
  //            "type": "number",
  //            "required": true
  //          }
  //        },
  //        "additionalProperties": true,
  //        "type": "object",
  //        "required": true
  //      },
  //      "required": true
  //    }
  //  },
  //  "additionalProperties": true,
  //  "type": "object",
  //  "required": true
  //}
  console.log(JSON.stringify(expanded,null,2));
});

RAML type canonical form

The canonical form computes inheritance and pushes unions to the top level of the type structure of an expanded RAML type. It is described in the documentation section of this repository.

Usage Clojure

The Clojure interface to compute the canonical form is implemented in the datatype-expansion.canonical-form/canonical-form function. The function accepts and expanded RAML type and returns the canonical form for the same type.

;; A type context with some types definitions
(def types-context {"Songs.Song" {:properties {:title "string"
                                               :length "number"}}
                    "Songs.Album" {:properties {:title "string"
                                                :songs "Songs.Song[]"}}})

(-> types-context
    (get "Songs.Song")
    (datatype-expansion.expanded-form/expanded-form types-context)
    datatype-expansion.canonical-form/canonical-form)

Usage Node.js

The Node.js version of the canonical form function is defined in the canonicalForm function of the library module. It accepts a JSON in-memory representation of an expanded RAML type and a callback function. It returns the canonical form or an exception:

var tools = require("datatype-expansion");

var typesContext = {"Songs.Song": {"properties": {"title": "string",
                                                 "length": "number"}},
                    "Songs.Album": {"properties": {"title": "string",
                                                   "songs": "Songs.Song[]"}}};
tools.expandedForm(typesContext["Songs.Album"], typesContext, function(err, expanded) {

   tools.canonicalForm(expanded, function(err, canonical) {
    // canonical contains the computed canonical form
    console.log(canonical);
   });

});

Running tests

Tests for the library can be run for the clojure version using leiningen:

$ lein test

The JavaScript tests can be run with the following leiningen invocation:

$ lein doo node test

Building the NPM package

The ClojureScript code of the library can be packaged as a NPM library using the following leiningen comand:

$ lein cljsbuild once default

This command will compile the ClojureScript code into JavaScript code that can be published as a NPM package using the provided packages.json file.