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define [
], (_, Chaplin) ->
' use strict'
# Application-specific utilities
# ------------------------------
# Shortcut to the mediator
mediator = Chaplin.mediator
# Delegate to Chaplin’s utils module
utils = Chaplin.utils.beget Chaplin.utils
# Add additional application-specific properties and methods
# String helpers
# --------------
# camel-case-helper > camelCaseHelper
camelize: do ->
regexp = /[-_]([a-z])/g
camelizer = (match, c) ->
(string) ->
string.replace regexp, camelizer
# dashHelper -> dash-helper
dasherize: (string) ->
string.replace /[A-Z]/g, (char, index) ->
(if index isnt 0 then '-' else '') + char.toLowerCase()
# Persistent data storage
# -----------------------
# sessionStorage with session cookie fallback
# sessionStorage(key) gets the value for 'key'
# sessionStorage(key, value) set the value for 'key'
sessionStorage: do ->
if window.sessionStorage and sessionStorage.getItem and
sessionStorage.setItem and sessionStorage.removeItem
(key, value) ->
if typeof value is 'undefined'
value = sessionStorage.getItem(key)
if value? and value.toString then value.toString() else value
sessionStorage.setItem(key, value)
(key, value) ->
if typeof value is 'undefined'
utils.setCookie(key, value)
# sessionStorageRemove(key) removes the storage entry for 'key'
sessionStorageRemove: do ->
if window.sessionStorage and sessionStorage.getItem and
sessionStorage.setItem and sessionStorage.removeItem
(key) -> sessionStorage.removeItem(key)
(key) -> utils.expireCookie(key)
# Cookie fallback
# ---------------
# Get a cookie by its name
getCookie: (key) ->
pairs = document.cookie.split('; ')
for pair in pairs
val = pair.split('=')
if decodeURIComponent(val[0]) is key
return decodeURIComponent(val[1] or '')
# Set a session cookie
setCookie: (key, value, options = {}) ->
payload = "#{encodeURIComponent(key)}=#{encodeURIComponent(value)}"
getOption = (name) ->
if options[name] then "; #{name}=#{options[name]}" else ''
expires = if options.expires
"; expires=#{options.expires.toUTCString()}"
document.cookie = [
payload, expires,
(getOption 'path'), (getOption 'domain'), (getOption 'secure')
expireCookie: (key) ->
document.cookie = "#{key}=nil; expires=#{(new Date).toGMTString()}"
# Load additonal JavaScripts
# --------------------------
# We don’t use jQuery here because jQuery does not attach an error
# handler to the script. In jQuery, a proper error handler only works
# for same-origin scripts which can be loaded via XHR.
loadLib: (url, success, error, timeout = 7500) ->
head = document.head or document.getElementsByTagName('head')[0] or
script = document.createElement 'script'
script.async = 'async'
script.src = url
onload = (_, aborted = false) ->
return unless (aborted or
not script.readyState or script.readyState is 'complete')
clearTimeout timeoutHandle
# Handle memory leak in IE
script.onload = script.onreadystatechange = script.onerror = null
# Remove the script elem and its reference
head.removeChild(script) if head and script.parentNode
script = undefined
success() if success and not aborted
script.onload = script.onreadystatechange = onload
# This is what jQuery is missing
script.onerror = ->
onload null, true
error() if error
timeoutHandle = setTimeout script.onerror, timeout
head.insertBefore script, head.firstChild
# Functional helpers for handling asynchronous dependancies and I/O
# -----------------------------------------------------------------
# Wrap methods so they can be called before a deferred is resolved.
# The actual methods are called once the deferred is resolved.
# Parameters:
# Expects an options hash with the following properties:
# deferred
# The Deferred object to wait for.
# methods
# Either:
# - A string with a method name e.g. 'method'
# - An array of strings e.g. ['method1', 'method2']
# - An object with methods e.g. {method: -> alert('resolved!')}
# host (optional)
# If you pass an array of strings in the `methods` parameter the methods
# are fetched from this object. Defaults to `deferred`.
# target (optional)
# The target object the new wrapper methods are created at.
# Defaults to host if host is given, otherwise it defaults to deferred.
# onDeferral (optional)
# An additional callback function which is invoked when the method is called
# and the Deferred isn't resolved yet.
# After the method is registered as a done handler on the Deferred,
# this callback is invoked. This can be used to trigger the resolving
# of the Deferred.
# Examples:
# deferMethods(deferred: def, methods: 'foo')
# Wrap the method named foo of the given deferred def and
# postpone all calls until the deferred is resolved.
# deferMethods(deferred: def, methods: def.specialMethods)
# Read all methods from the hash def.specialMethods and
# create wrapped methods with the same names at def.
# deferMethods(
# deferred: def, methods: def.specialMethods, target: def.specialMethods
# )
# Read all methods from the object def.specialMethods and
# create wrapped methods at def.specialMethods,
# overwriting the existing ones.
# deferMethods(deferred: def, host: obj, methods: ['foo', 'bar'])
# Wrap the methods and so all calls to them are postponed
# until def is resolved. and are overwritten
# with their wrappers.
deferMethods: (options) ->
# Process options
deferred = options.deferred
methods = options.methods
host = or deferred
target = or host
onDeferral = options.onDeferral
# Hash with named functions
methodsHash = {}
if typeof methods is 'string'
# Transform a single method string into an object
methodsHash[methods] = host[methods]
else if methods.length and methods[0]
# Transform a method list into an object
for name in methods
func = host[name]
unless typeof func is 'function'
throw new TypeError "utils.deferMethods: method #{name} not
found on host #{host}"
methodsHash[name] = func
# Treat methods parameter as a hash, no transformation
methodsHash = methods
# Process the hash
for own name, func of methodsHash
# Ignore non-function properties
continue unless typeof func is 'function'
# Replace method with wrapper
target[name] = utils.createDeferredFunction(
deferred, func, target, onDeferral
# Creates a function which wraps `func` and defers calls to
# it until the given `deferred` is resolved. Pass an optional `context`
# to determine the this `this` binding of the original function.
# Defaults to `deferred`. The optional `onDeferral` function to after
# original function is registered as a done callback.
createDeferredFunction: (deferred, func, context = deferred, onDeferral) ->
# Return a wrapper function
# Save the original arguments
args = arguments
if deferred.state() is 'resolved'
# Deferred already resolved, call func immediately
func.apply context, args
# Register a done handler
deferred.done ->
func.apply context, args
# Invoke the onDeferral callback
if typeof onDeferral is 'function'
onDeferral.apply context
# Accumulators
collectedData: {}
handles: {}
handlers: {}
successHandlers: {}
errorHandlers: {}
interval: 2000
# Turns methods into accumulators, collecting calls and sending
# them out in intervals
# obj
# the object the methods are read from and written to
# methods
# zero or more names (strings) of methods (object members) to be wrapped
wrapAccumulators: (obj, methods) ->
# Replace methods
for name in methods
func = obj[name]
unless typeof func is 'function'
throw new TypeError "utils.wrapAccumulators: method #{name} not found"
# Replace method
obj[name] = utils.createAccumulator name, obj[name], obj
# Bind to unload to synchronously flush accumulated remains
$(window).unload =>
handler(async: false) for name, handler of utils.accumulator.handlers
# Returns an accumulator for the given 'func' with the
# parameter list (data, success, error, options)
createAccumulator: (name, func, context) ->
# Create a unique ID for the function, save it as a
# property of the function object
unless id = func.__uniqueID
id = func.__uniqueID = name + String(Math.random()).replace('.', '')
acc = utils.accumulator
# Cleanup data
cleanup = ->
delete acc.collectedData[id]
delete acc.successHandlers[id]
delete acc.errorHandlers[id]
# Create accumulated success and error callbacks
accumulatedSuccess = ->
handlers = acc.successHandlers[id]
handler.apply(this, arguments) for handler in handlers if handlers
accumulatedError = ->
handlers = acc.errorHandlers[id]
handler.apply(this, arguments) for handler in handlers if handlers
# Resulting function
(data, success, error, rest...) ->
# Store data, success and error handlers
if data
acc.collectedData[id] = (acc.collectedData[id] or []).concat(data)
if success
acc.successHandlers[id] = (
acc.successHandlers[id] or []
if error
acc.errorHandlers[id] = (acc.errorHandlers[id] or []).concat(error)
# Set timeout if not already set
return if acc.handles[id]
handler = (options = options) ->
return unless collectedData = acc.collectedData[id]
# Call the original function
args = [
collectedData, accumulatedSuccess, accumulatedError
func.apply context, args
# Clear timeout
clearTimeout acc.handles[id]
# Remove handles and handlers
delete acc.handles[id]
delete acc.handlers[id]
# Save the handler
acc.handlers[id] = handler
# Wrap handler in additional function to ignore
# Firefox' latency arguments
acc.handles[id] = setTimeout (-> handler()), acc.interval
# Call the given function `func` when the global event `eventType` occurs.
# Defaults to 'login', so the `func` is called when
# the user has successfully logged in.
# When the function is called, `this` points to the given `context`.
# You may pass a `loginContext` for the UI context where
# the login was triggered.
afterLogin: (context, func, eventType = 'login', args...) ->
if mediator.user
# All fine, just pass through
func.apply context, args
# Register a handler for the given event
loginHandler = ->
# Cleanup
mediator.unsubscribe eventType, loginHandler
# Pass to wrapped function
func.apply context, args
mediator.subscribe eventType, loginHandler
deferMethodsUntilLogin: (obj, methods, eventType = 'login') ->
methods = [methods] if typeof methods is 'string'
for name in methods
func = obj[name]
unless typeof func is 'function'
throw new TypeError "utils.deferMethodsUntilLogin: method #{name}
not found"
obj[name] = _(utils.afterLogin).bind null, obj, func, eventType
# Delegates to afterLogin, but triggers the login dialog if the user
# isn't logged in
# and calls preventDefault if an event object is passed.
ensureLogin: (context, func, loginContext, eventType = 'login', args...) ->
utils.afterLogin context, func, eventType, args...
unless mediator.user
# If an event is passed to the original function, prevent the
# default action
if (e = args[0]) and typeof e.preventDefault is 'function'
# Start login process
mediator.publish '!showLogin', loginContext
# Wrap methods which need a logged-in user.
# Trigger the login when they are called and there is no user.
# Arguments:
# `obj`: The object whose methods should be wrapped
# `methods`: A string or an array of strings with method names
# `loginContext`: object with login context information, should have
# a `description` property
# `eventType`: The global PubSub event the actual method call will wait for.
# Defaults to 'login'.
ensureLoginForMethods: (obj, methods, loginContext, eventType = 'login') ->
# Transform a single method string into a list
methods = [methods] if typeof methods is 'string'
for name in methods
func = obj[name]
unless typeof func is 'function'
throw new TypeError "utils.ensureLoginForMethods: method #{name}
not found"
obj[name] = _(utils.ensureLogin).bind(
null, obj, func, loginContext, eventType
# Facebook image helper
# ---------------------
facebookImageURL: (fbId, type = 'square') ->
# Create query string
params = type: type
# Add the Facebook access token if present
if mediator.user
accessToken = mediator.user.get('accessToken')
params.access_token = accessToken if accessToken
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