stringify.js
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'use strict'
const promise = require('./promise')
const streamify = require('./streamify')
module.exports = stringify
/**
* Public function `stringify`.
*
* Returns a promise and asynchronously serialises a data structure to a
* JSON string. Sanely handles promises, buffers, maps and other iterables.
*
* @param data: The data to transform
*
* @option space: Indentation string, or the number of spaces
* to indent each nested level by.
*
* @option promises: 'resolve' or 'ignore', default is 'resolve'.
*
* @option buffers: 'toString' or 'ignore', default is 'toString'.
*
* @option maps: 'object' or 'ignore', default is 'object'.
*
* @option iterables: 'array' or 'ignore', default is 'array'.
*
* @option circular: 'error' or 'ignore', default is 'error'.
*
* @option yieldRate: The number of data items to process per timeslice,
* default is 16384.
*
* @option bufferLength: The length of the buffer, default is 1024.
*
* @option Promise: The promise constructor to use, defaults to bluebird.
**/
function stringify (data, options) {
const json = []
const Promise = promise(options)
const stream = streamify(data, options)
let resolve, reject
stream.on('data', read)
stream.on('end', end)
stream.on('dataError', error)
return new Promise((res, rej) => {
resolve = res
reject = rej
})
function read (chunk) {
json.push(chunk)
}
function end () {
resolve(json.join(''))
}
function error (e) {
reject(e)
}
}