LocalStorage key patterns

LocalStorage.coffee

class Crypt

  constructor: (@key) ->
    GibberishAES.size(128);
    
  decrypt: (str) ->
    return str unless str? and @key?
    GibberishAES.dec(str, @key)
    
  encrypt: (str) ->
    return str unless str? and @key?
    crypt = GibberishAES.enc(str, @key)
    crypt
    
#  
class LocalStorage extends Crypt 
    
  constructor: (key) ->
    super(key)
    unless localStorage.length
      localStorage.setItem('Initialized', new Date)
    @
  
  get: (key) -> 
    val = @decrypt localStorage.getItem(key)
    JSON.parse(val) if val
    
  set: (key, val) -> 
    localStorage[key] = @encrypt JSON.stringify(val)

  keymatch: (key, pattern) ->
    return true if pattern is "*"
    if pattern.substr(-1) is "*"
      prefix = pattern.substr(0, pattern.length - 1)
      return key.substr(0, prefix.length) is prefix  
      
  getPattern: (pattern, cont) ->
    unless pattern.substr(-1) is "*"
      return [@get(pattern)]
      
    result = []
    len = localStorage.length
  
    while --len 
      key = localStorage.key( len )
      if key and @keymatch(key, pattern)
        result.push @get( key )
  
    result