Functions to translate between JavaScript Interoperable Dynamic Values (IDVs) and Query String Jevko -- a Jevko-based format which is designed to be both human readable and to fit into URL query strings without escaping. This allows exchanging complex values via query strings in a compact, readable, minimal, and predictable way.

An IDV is a JavaScript value which is either:

a string
a nonempty Array of IDV
a nonempty Map from nonempty string to IDV

Installation

Node.js

npm install jevko/queryjevko.js#semver:0.1.0

Deno and the browser

Import from jsDelivr:

import {parseJevko} from 'https://cdn.jsdelivr.net/gh/jevko/queryjevko.js@v0.1.0/mod.js'

Quickstart

import {parseJevko, jevkoToJs, jsToJevko} from 'https://cdn.jsdelivr.net/gh/jevko/queryjevko.js@v0.1.0/mod.js'
const str = `include(author)fields(articles((title)(body))people((name)))`
const map = jevkoToJs(parseJevko(str))
console.log(map)
// Map(2) {
//   'include' => 'author',
//   'fields' => Map(2) { 'articles' => [ 'title', 'body' ], 'people' => [ 'name' ] }
// }
console.log(jsToJevko(map) === str)
// true

parseJevko

parseJevko takes a string which must conform to the following ABNF grammar:

Jevko = *(
  "(" Jevko ")" / ; nested Jevko
  "~" ("~" / "(" / ")") / ; digraph/escape
  %x0-5a / %x5c / %x5e-5f / %x61-10ffff ; any Unicode char except parens and tilde 
)

and returns a parse tree for it.

jevkoToJs

jevkoToJs translates the result of parseJevko into IDVs.

For example it will translate the result of parsing this:

include(author)fields(articles((title)(body))people((name)))

into this:

Map(2) {
  'include' => 'author',
  'fields' => Map(2) { 'articles' => [ 'title', 'body' ], 'people' => [ 'name' ] }
}

jsToJevko

jsToJevko turns the result of jevkoToJs back into a string. For example it turns this:

Map(2) {
  'include' => 'author',
  'fields' => Map(2) { 'articles' => [ 'title', 'body' ], 'people' => [ 'name' ] }
}

into this:

include(author)fields(articles((title)(body))people((name)))

Attribution

The following piece of example data used here:

include(author)fields(articles((title)(body))people((name)))

is based on an example from the JSON API spec.

MIT License