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Viewing file:     from.js (2.54 KB)      -rw-r--r--

'use strict'

/* replacement start */

const process = require('process/')

/* replacement end */

const { PromisePrototypeThen, SymbolAsyncIterator, SymbolIterator } = require('../../ours/primordials')
const { Buffer } = require('buffer')
const { ERR_INVALID_ARG_TYPE, ERR_STREAM_NULL_VALUES } = require('../../ours/errors').codes
function from(Readable, iterable, opts) {
  let iterator
  if (typeof iterable === 'string' || iterable instanceof Buffer) {
    return new Readable({
      objectMode: true,
      ...opts,
      read() {
        this.push(iterable)
        this.push(null)
      }
    })
  }
  let isAsync
  if (iterable && iterable[SymbolAsyncIterator]) {
    isAsync = true
    iterator = iterable[SymbolAsyncIterator]()
  } else if (iterable && iterable[SymbolIterator]) {
    isAsync = false
    iterator = iterable[SymbolIterator]()
  } else {
    throw new ERR_INVALID_ARG_TYPE('iterable', ['Iterable'], iterable)
  }
  const readable = new Readable({
    objectMode: true,
    highWaterMark: 1,
    // TODO(ronag): What options should be allowed?
    ...opts
  })

  // Flag to protect against _read
  // being called before last iteration completion.
  let reading = false
  readable._read = function () {
    if (!reading) {
      reading = true
      next()
    }
  }
  readable._destroy = function (error, cb) {
    PromisePrototypeThen(
      close(error),
      () => process.nextTick(cb, error),
      // nextTick is here in case cb throws
      (e) => process.nextTick(cb, e || error)
    )
  }
  async function close(error) {
    const hadError = error !== undefined && error !== null
    const hasThrow = typeof iterator.throw === 'function'
    if (hadError && hasThrow) {
      const { value, done } = await iterator.throw(error)
      await value
      if (done) {
        return
      }
    }
    if (typeof iterator.return === 'function') {
      const { value } = await iterator.return()
      await value
    }
  }
  async function next() {
    for (;;) {
      try {
        const { value, done } = isAsync ? await iterator.next() : iterator.next()
        if (done) {
          readable.push(null)
        } else {
          const res = value && typeof value.then === 'function' ? await value : value
          if (res === null) {
            reading = false
            throw new ERR_STREAM_NULL_VALUES()
          } else if (readable.push(res)) {
            continue
          } else {
            reading = false
          }
        }
      } catch (err) {
        readable.destroy(err)
      }
      break
    }
  }
  return readable
}
module.exports = from