src/worker/worker-utils.js

/**
 * @file Worker Utils
 * @author Alexander Rose <alexander.rose@weirdbyte.de>
 * @private
 */

import { uniqueArray } from '../utils.js'

function getWorkerDeps (vars) {
  var deps = vars
  vars.forEach(function (sym) {
    if (sym.__deps) {
      Array.prototype.push.apply(deps, getWorkerDeps(sym.__deps))
    }
  })
  return deps
}

function makeWorkerString (vars) {
  var deps = uniqueArray(getWorkerDeps(vars))
  return deps.map(function (sym) {
    return sym.toString()
  }).join('\n\n\n')
}

function onmessage (e) {
  var name = e.data.__name
  var postId = e.data.__postId

  /* global self */
  if (name === undefined) {
    console.error('message __name undefined')
  } else if (self.func === undefined) {
    console.error('worker func undefined', name)
  } else {
    var callback = function (aMessage, transferList) {
      aMessage = aMessage || {}
      if (postId !== undefined) aMessage.__postId = postId

      try {
        self.postMessage(aMessage, transferList)
      } catch (error) {
        console.error('self.postMessage:', error)
        self.postMessage(aMessage)
      }
    }

    self.func(e, callback)
  }
}

function makeWorkerBlob (func, deps) {
  var str = "'use strict';\n\n" + makeWorkerString(deps)
  str += '\n\n\nself.func = ' + func.toString() + ';'
  str += '\n\n\nself.onmessage = ' + onmessage.toString() + ';'
    // console.log( str );
  return new window.Blob([ str ], { type: 'application/javascript' })
}

export {
    makeWorkerBlob
}