Parse shift-spec into a more usable form
Last updated 3 years ago by shapesecurity .
Apache-2.0 · Repository · Bugs · Original npm · Tarball · package.json
$ cnpm install shift-spec-consumer 
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Shift Spec Consumer


This module parses the Shift specification into a more usable form.


npm install shift-spec-consumer


let specConsumer = require("shift-spec-consumer");
let {nodes, enums, namedTypes} = specConsumer(/* contents of spec.idl */, /* contents of attribute-order.conf */);

The object returned by calling this module's default export appropriately has three keys: node, nums, and namedTypes. All are ES2015 Maps.

nodes is a map from node names (as strings) to objects of the form

{attributes, children, parents}


  • attributes is an ordered list of objects of the form {name, type, inherited}, where those attributes are respectively a string, a type (see below), and a boolean indicating whether this field is inherited.
  • children is a list of names of nodes which descend from this node
  • parents is a list of names of nodes from which this node descends.

enums is a map from names to lists of strings, which were enums in the spec.

namedTypes is a map from type names to types (see below).

A type is a two-key object {kind, argument}, where

  • kind is one of 'nullable', 'union', 'list', 'value', 'node', 'enum', 'namedType'
  • argument depends on kind. For
    • nullable it is a type
    • union it is a list of types
    • list it is a type
    • value it is one of 'string', 'boolean', 'double'
    • node it is a key in nodes
    • enum it is a key in nums
    • namedType it is a key in namedTypes.


  • Open a Github issue with a description of your desired change. If one exists already, leave a message stating that you are working on it with the date you expect it to be complete.
  • Fork this repo, and clone the forked repo.
  • Create a feature branch. Make your changes.
  • Make a commit that includes the text "fixes #XX" where XX is the Github issue.
  • Open a Pull Request on Github.


Copyright 2016 Shape Security, Inc.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
See the License for the specific language governing permissions and
limitations under the License.

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