findReferences(obj, path)

Small utility that resolves property paths against a given object. Instead of returning the primitive value, it computes an array of Reference objects that contains both the container object and the property name, thus allowing dynamic read and write of the value.

The function traverses both array's indexes and object's properties, when a wildcard segment "*" is used.

How to use

Install it with NPM or add it to your package.json:

$ npm install campsi-find-references

Then:

const findRefs = require('campsi-find-references');

Example

{
    "$schema": "http://json-schema.org/draft-04/schema#",
    "title": "Product",
    "description": "A product from Acme's catalog",
    "type": "object",
    "properties": {
        "id": {
            "description": "The unique identifier for a product",
            "type": "integer"
        },
        "name": {
            "description": "Name of the product",
            "type": "string"
        },
        "price": {
            "type": "number",
            "minimum": 0,
            "exclusiveMinimum": true
        }
    },
    "required": ["id", "name", "price"]
}

Find the root title "Product"

const refs = findReferences(json, ['title']);

refs.length; // 1
refs[0] // => Reference { parent: {$schema: …}, propName: 'title' }
refs[0].set('My Product');

assert.equal('My Product', json.title); // => 'OK!'

Find all properties.description

const refs = findReferences(json, ['properties', '*', 'description']);

refs.length; // 2
refs[1].get(); // => "Name of the product"

By specifying a wildcard segment between properties and description, the findReferences function will iterate over id, name and price. It won't find a description property in the third one and only return two refs.

The Reference object

The findReferences function returns an array of Reference object. These objects are composed of two properties : the container and the propName. Their prototype provides two shortcut methods :

• get() which does basically return this.container[propName]
• set(value) which obviously does this.container[propName] = value

Features

• Fully tested (Mocha)
• Handles circular structure
• No dependencies

License

MIT. See LICENSE for details.