Ra.js

Provides a Javascript only runtime for Relational Algebra.

Write the relational algebra syntax specified by the lastest ra-parser and see the results as an ordered program.

How to use

"use strict"

const 
   rajs = require('ra-js'),
   ra   = new rajs();

ra.run("People := [[firstName / String, lastName / String] -> [['John', 'Doe'], ['Mary', 'Jane']]];");
console.log(ra.getRelation('Example');
// [[firstName / String, lastName / String] -> [['John', 'Doe']]]

ra.run("Johns := Select[firstName == 'John'](People);");
console.log(ra.env);

Ra Environment

After running relational algebra, the results are stored in the environment, referred to as the .env property.

The relations are currently available as relations from the affinity package.

TODO:

• Make output format plaintext, and fix changing state for plaintext
• Fix support for Outer Joins
• Fix support for not equal != shorthand
• Fix support for Theta Joins
• Complete testing over operators
• Add support for grouping
• Add support for ordering
• Add support for operator functions (tangent, sine, cosine, etc.)

Please see ra-parser for the complete syntax specification.

author: Adel Lahlou