pre.js

/** @format */

var initialized = false
var initListeners = []

var stdin = ''
var inBuffer = []
var outBuffer = []
var errBuffer = []

function toByteArray(str) {
  var byteArray = []
  var encodedStr = unescape(encodeURIComponent(str))
  for (var i = 0; i < encodedStr.length; i++) {
    byteArray.push(encodedStr.charCodeAt(i))
  }
  return byteArray
}

function fromByteArray(data) {
  var array = new Uint8Array(data)
  var str = ''
  for (var i = 0; i < array.length; ++i) {
    str += String.fromCharCode(array[i])
  }
  return decodeURIComponent(escape(str))
}

// Note about Emscripten, even though the module is now named 'jq', pre.js still uses Module, but post.js uses 'jq'
Module = Object.assign(
  {
    noInitialRun: true,
    noExitRuntime: true,
    onRuntimeInitialized: function() {
      initialized = true
      initListeners.forEach(function(cb) {
        cb()
      })
    },
    preRun: function() {
      FS.init(
        function input() {
          if (inBuffer.length) {
            return inBuffer.pop()
          }

          if (!stdin) return null
          inBuffer = toByteArray(stdin)
          stdin = ''
          inBuffer.push(null)
          inBuffer.reverse()
          return inBuffer.pop()
        },
        function output(c) {
          if (c) {
            outBuffer.push(c)
          }
        },
        function error(c) {
          if (c) {
            errBuffer.push(c)
          }
        }
      )
    }
  },
  Module
)