numberarray.js

//no whitespace whole number json array parsing
function SavedStateNumberArrayParser() {
  this.state = "unopened"
  this.value = undefined
}
SavedStateNumberArrayParser.prototype.arr = function() {
  return this.state === "error" ? undefined : this.value
}
SavedStateNumberArrayParser.prototype.reset = function() {
  this.state = this.state === "closed" || typeof this.value === "undefined" ? "unopened" : "inside"
  if(this.state === "unopened") this.value = undefined
  return this.state
}
SavedStateNumberArrayParser.prototype.parse = function(str) {
  for(var i=0;i<str.length;i++) switch(this.state) {
    case "unopened":
      if(str.charAt(i)==="[") {
        this.state = "inside"
      }
      else {
        this.state = "error"
      }
      break
    case "continueinside":
      //shares all attributes with next except ","
      if(str.charAt(i)===",") {
        this.state = "error";
        break
      }
    case "inside":
      if(str.charAt(i)===",") {
        this.value.push(0)
      }
      else if(str.charAt(i)==="]") {
        this.state = "closed"
      }
      else if(/\d/.test(str.charAt(i))) {
        this.value = this.value || [0]
        this.value[this.value.length] = this.value[this.value.length] * 10 + Number(str.charAt(i))
        break
      }
    case "closed":
    default: this.state = "error"
  }
}

statemachine.js

function Client() {
  this.state = "loggedoff"
}

//attempt to say something, will attempt login every time and keep you at as far as you have gotten
Client.prototype.say = function(msg) {
  switch(this.state) {
    case "loggedoff":
      this.queueLogin()
    case "authenticated":
      this.queueVoiceRequest()
    case "voiced":
      this.queueMessage(msg)
      break
    //banned etc.
    default:
      throw "not allowed"
  }
}