skeyma

skeyma is a JavaScript parser & serializer for {key, value} objects & streams. It's useful for storing and retreiving levelup object streams.

Installation

npm install skeyma

Examples

Using skeyma for objects

import skeyma from "skeyma"

const template = "${forumId}/${postId}/${commentId}"
const {parse, serialize} = skeyma(template)
const object = {text: "Hello.", forumId: "1", postId: "2", commentId: "3"}

console.log(object)
// { text: 'Hello.', forumId: '1', postId: '2', commentId: '3' }

console.log(serialize(object))
// { key: '1/2/3', value: { text: 'Hello.' } }

console.log(parse(serialize(object)))
// { text: 'Hello.', forumId: '1', postId: '2', commentId: '3' }

Using skeyma for object streams

import skeyma from "skeyma"
import {Readable} from "stream"
import {deepEqual} from "assert"

const template = "${forumId}/${postId}/${commentId}"
const {parse, serialize} = skeyma(template)
const object = {text: "Hello.", forumId: "1", postId: "2", commentId: "3"}
const objects = Readable({objectMode: true})

objects.push(object)
objects.push(null)

objects              .on("data", console.log)
  .pipe(serialize()) .on("data", console.log)
  .pipe(parse())     .on("data", console.log)

// { text: 'Hello.', forumId: '1', postId: '2', commentId: '3' }
// { key: '1/2/3', value: { text: 'Hello.' } }
// { text: 'Hello.', forumId: '1', postId: '2', commentId: '3' }

API

let {parse, serialize} = skeyma(template)

Returns a parser/serializer instance based on the template string, in which object keys are delimited by ${...}, similar to ES6 template strings.

let kv = serialize([obj])

Returns a new {key, value} object from the original object. The key is rendered from the schema template, and the value is a copy of the original object, with the key fields removed. If no object is provided, a serialize transform is returned.

let obj = parse([kv])

Returns a new object from the original {key, value}. The object is a copy of the original value, with additional fields extracted from the key according to the template. If no object is provided, a parse transform is returned.