Device Compatibility Spike

device-compatibility.coffee

class CompatibilityNotification
  constructor: ->
    @violations = []
    @rules = []

  registerRule: (rule) ->
    # probably just need the key here
    @rules.push(rule)

  registerViolation: (key, message) ->
    @violations.push(new CompatibilityViolation(key, message))

# makes all the codez easier
class DeviceContext
  isDefined: (obj, key) ->
    return typeof(obj[key]) isnt 'undefined'

  windowDefines: (key) ->
    return @isDefined(window, key)

class CompatibilityViolation
  constructor: (@key, @message) ->

class CompatibilityRunner
  constructor: (@context, @rules) ->

  run: ->
    notification = new CompatibilityNotification()
    for rule in @rules
      notification.registerRule(rule)
      rule.execute(@context, notification)

    return notification

class WindowKeyCompatibilityRule
  constructor: (@key, @message) ->

  execute: (context, notification) ->
    if(!context.windowDefines(@key))
      notification.registerViolation(@key, @message)

class ServerSentEventsRule extends WindowKeyCompatibilityRule
  constructor: (@message = 'Server Sent events are not available') ->
    @EventSourceKey = 'EventSource'

    super @EventSourceKey, @message

class SomethingWeird extends WindowKeyCompatibilityRule
  constructor: (@message = 'Something is not available') ->
    @TheKey = 'Something'

    super @TheKey, @message

class BasicBootstrapper
  giveMeSomethingGood: ->
    rules = []
    rules.push(new ServerSentEventsRule())
    rules.push(new SomethingWeird())

    context = new DeviceContext()
    return new CompatibilityRunner(context, rules)

# Rules we need: EventSource, WebWorker, Html5 elements (section, article, form inputs [email, date])