Skip to the content.

A Document Path Library for Node

NPM version Downloads Minzipped Size Build Status Coverage Status Typings

This module will take paths in documents which can include nested paths specified by ‘.’s and can evaluate the path to a value, or can set the value at that path depending on the function called.

Installation

$ npm install doc-path

Usage

let path = require('doc-path');

API

path.evaluatePath(document, key)

If the key does not exist, undefined is returned.

If the object’s structure is extremely deep, then an error may be thrown if the maximum call stack size is exceeded while traversing the object.

path.evaluatePath Example:
const path = require('doc-path');

let document = {
    Make: 'Nissan',
    Model: 'Murano',
    Year: '2013',
    Specifications: {
        Mileage: '7106',
        Trim: 'S AWD'
    },
    Features: [
		{
		    feature: 'A/C',
			packages: [
				{name: 'Base'},
				{name: 'Premium'}
			]
		},
		{
		    feature: 'Radio',
			packages: [
				{name: 'Convenience'},
				{name: 'Premium'}
			]
		}
	]
};

console.log(path.evaluatePath(document, 'Make'));
// => 'Nissan'

console.log(path.evaluatePath(document, 'Specifications.Mileage'));
// => '7106'

console.log(path.evaluatePath(document, 'Features.feature'));
// => [ 'A/C', 'Radio' ]

console.log(path.evaluatePath(document, 'Features.packages.name'));
// => [ ['Base', 'Premium'], ['Convenience', 'Premium'] ]

path.setPath(document, key, value)

If the key does not exist, then the object will be built up to have that path. If no document is provided, an error will be thrown. If the object’s structure is extremely deep, then an error may be thrown if the maximum call stack size is exceeded while traversing the object.

path.setPath Example:

 const path = require('doc-path');

 let document = {
     Make: 'Nissan',
     Features: [
         { feature: 'A/C' }
     ]
 };

 console.log(path.setPath(document, 'Color.Interior', 'Tan'));
 /*
	{ 
		Make: 'Nissan',
		Features: [
			{ feature: 'A/C' }
		]
		Color: { 
			Interior: 'Tan'
		}
	}
 */

 console.log(path.setPath(document, 'StockNumber', '34567'));
 /*
	{ 
		Make: 'Nissan',
		Features: [
			{ feature: 'A/C' }
		]
		Color: { 
			Interior: 'Tan'
		},
		StockNumber: '34567'
	}
 */
 
 console.log(path.setPath(document, 'Features.cost', '$0 (Standard)'));
  /*
 	{ 
		Make: 'Nissan',
		Features: [
			{
				feature: 'A/C',
				cost: '$0 (Standard)'
			}
		]
		Color: { 
			Interior: 'Tan'
		},
		StockNumber: '34567'
 	}
  */

Tests

$ npm test

Note: This requires mocha, should, async, and underscore.

To see test coverage, please run:

$ npm run coverage

Current Coverage is:

Statements   : 100% ( 33/33 )
Branches     : 100% ( 24/24 )
Functions    : 100% ( 3/3 )
Lines        : 100% ( 29/29 )

Features