ecore-ts

Ecore (EMF) implementation in TypeScript.

Content

• Background
• Install
• Usage
• Contributing
• History
• License

Background

This is a fork of ecore.js. As per discussed in pull/47, the original repository is no longer maintained and BlackBeltTechnology will continue the maintenance and implementation of potential new features here.

The original license can be found in archive/LICENSE.

Install

Browser

Using the library as-is via CDN:

<script type="module">
  import { EPackage, ResourceSet, EClass, EAttribute, EString } from 'https://unpkg.com/ecore-ts';

  const rs = ResourceSet.create();
  const hello = rs.create({ uri: 'hello' });
  const helloPackage = EPackage.create({ name: 'hello', nsPrefix: 'hello' , nsURI: 'https://ecore-ts.com/hello'});
  const helloClass = EClass.create({ name: 'Hello' });
  const worldAttribute = EAttribute.create({ name: 'world', eType: EString });

  helloClass.get('eStructuralFeatures').add(worldAttribute);
  helloPackage.get('eClassifiers').add(helloClass);
  hello.get('contents').add(helloPackage);

  console.log(hello.to(JSON));
</script>

Node / NPM

Ecore.ts is available on NPM and can be use as a Node module. To install it simply use the following command from your terminal:

npm install ecore-ts

Usage

Create a model

import { EPackage, ResourceSet, EClass, EReference, EAttribute, EString } from 'ecore-ts';

// Resources contain model elements and are identified by a URI.

const resourceSet = ResourceSet.create();
const resource = resourceSet.create({ uri: '/model.json' });

// EClass are used to define domain elements, they are identified
// by name and a set of structural features (attributes and references).

const User = EClass.create({
    name: 'User',
    eStructuralFeatures: [
        // EAttributes are used to define domain elements
        // elements properties.
        EAttribute.create({
            name: 'name',
            upperBound: 1,
            eType: EString
        }),
        // EReference are used to define links between domain
        // elements.
        EReference.create({
            name: 'friends',
            upperBound: -1,
            containment: false,
            eType: () => User,
        }),
    ],
});

// EPackages represent namespaces for a set of EClasses.
// It's properties name, nsURI and nsPrefix must be set.

const SamplePackage = EPackage.create({
    name: 'sample',
    nsURI: 'https://www.example.org/sample',
    nsPrefix: 'sample',
    eClassifiers: [
        User,
    ],
});

// Packages must be added directly to the model's Resource.

resource.add(SamplePackage);

Model Elements can also be created separately.

import { EClass, EAttribute, EReference, EString } from 'ecore-ts';

const User = EClass.create({ name: 'User' });
const User_name = EAttribute.create({
   name: 'name',
   eType: EString,
});
const User_friends = EReference.create({
   name: 'friends',
   upperBound: -1,
   eType: User,
});
User.get('eStructuralFeatures').add(User_name);
User.get('eStructuralFeatures').add(User_friends);

Create instances

const u1 = User.create({ name: 'u1' });
const u2 = User.create({ name: 'u2' });
u1.get('friends').add(u2);

u1.get('friends').each((friend) => { console.log(friend) });

JSON Support

JSON is the default serialization format supported by ecore.ts. The JSON format is described here and looks like this:

{
    "eClass" : "/model.json#//User",
    "name" : "u1",
    "friends" : [
        { "$ref" : "/u2.json#/", "eClass": "/model.json#//User" },
        { "$ref" : "/u3.json#/", "eClass": "/model.json#//User" }
    ]
}

XMI Support

Support for XMI has been added in version 0.3.0.

import { ResourceSet, XMI } from 'ecore-ts';

var resourceSet = ResourceSet.create();
var resource = resourceSet.create({ uri: 'test2.xmi' });

resource.parse(data, XMI); // data being a string containing the XMI.

resource.to(XMI, true); // returns the XMI string

Contributing

If you want to contribute to this project or simply build from the source, you first need to clone the project by executing the following command in your terminal.

> git clone [e-mail]:BlackBeltTechnology/ecore-ts.git

To build the project or run the tests you first need to install Node, npm (distributed with Node).

We recommend using NVM, with it, you can easily manage your NodeJS versions similarly to virtualenvs.

If you are using NVM, all you need to do is to run the following in the repository root:

nvm install

The tests are written using the Vitest library. To run them, execute the following command:

> npm test

Running a build will create a new distribution in the folder dist. This is done by executing the command:

> npm run build

That's it, you are now ready to contribute to the project.

License

Eclipse Public License - v 2.0