require 'iowa/Association'
require 'singleton'

module Iowa

  class UnknownValue
    include Singleton
    def to_s
      'UNK'
    end
  end
  alias :to_str :to_s

  BindingKeywords = {'action' => [LiteralAssociation,true],
    'id' => [LiteralAssociation, false],
    'item' => [PathAssociation,true],
    'list' => [FlexibleAssociation,true],
    'key' => [PathAssociation,true],
    'klass' => [LiteralAssociation,true], # not 'class' because of HTML conflict
    'tag' => [LiteralAssociation,true],
    'condition' => [PathAssociation,true],
    'value' => [PathAssociation,true]}

  ClassSeparator = '::'.freeze
  ContentClassesNamespace = 'Iowa::Application::ContentClasses'.freeze

  C_ = ' '.freeze
  C_1_0 = '1.0'.freeze
  C__ = '_'.freeze
  C_amp = '&'.freeze
  C_anon_ = '_anon_'.freeze
  C_at = '@'.freeze
  C_atat = '@@'.freeze
  C_bnd = '.bnd'.freeze
  C_comma = ','.freeze
  C_content = '_content'.freeze
  C_dash = '-'.freeze
  C_dat = '.dat'.freeze
  C_default = '_default'.freeze
  C_dot = '.'.freeze
  C_dotdot = '..'.freeze
  C_empty = ''.freeze
  C_equal = '='.freeze
  C_gt = '>'.freeze
  C_item = '_item'.freeze
  C_iwa = '.iwa'.freeze
  C__keystack = '__keystack'.freeze
  C_list = '_list'.freeze
  C_method = '_method'.freeze
  C_semicolon = ';'.freeze
  C_slash = '/'.freeze
  C_slashindex_html = '/index.html'.freeze
  C0 = '0'.freeze
  C_0to7 = 0..7.freeze
  C1 = '1'.freeze
  Caction = 'action'.freeze
  Caddresses = 'addresses'.freeze
  Capplication = 'application'.freeze
  Capplication_data = 'application/data'.freeze
  Cargs = 'args'.freeze
  Cbasedir = 'basedir'.freeze
  Cbaselog = 'baselog'.freeze
  Cbasename = 'basename'.freeze
  Cbody = 'body'.freeze
  CBodyContent = 'BodyContent'.freeze
  Cbrowsers = 'browsers'.freeze
  Cbutton = 'button'.freeze
  Ccacheable = 'cacheable'.freeze
  Ccgi_root = 'cgi_root'.freeze
  Ccheckbox = 'checkbox'.freeze
  Cchecked = 'checked'.freeze
  Cchecksum = 'checksum'.freeze
  CClass = 'Class'.freeze
  Cclass = 'class'.freeze
  Cclosed = 'closed'.freeze
  Ccondition = 'condition'.freeze
  CConnection = 'Connection'.freeze
  CContent_length = 'Content-length'.freeze
  CContent_Length = 'Content-Length'.freeze
  CCONTENT_LENGTH = 'CONTENT-LENGTH'.freeze
  CContent_Type = 'Content-Type'.freeze
  CContent_type = 'Content-type'.freeze
  CCONTENT_TYPE = 'CONTENT_TYPE'.freeze
  CContentClasses = 'ContentClasses'.freeze
  CCookie = 'Cookie'.freeze
  Ccookie = 'cookie'.freeze
  CCOOKIE = 'COOKIE'.freeze
  Ccreate = 'create'.freeze
  Cdaemonize = 'daemonize'.freeze
  Cdatabase = 'database'.freeze
  CDate = 'Date'.freeze
  Cdebug = 'debug'.freeze
  Cdefault = 'default'.freeze
  Cdelete = 'delete'.freeze
  CDELETE = 'DELETE'.freeze
  Cdepth = 'depth'.freeze
  Cdestroy = 'destroy'.freeze
  Cdirectory = 'directory'.freeze
  Cdispatcher = 'dispatcher'.freeze
  Cdo_initial_load = 'do_initial_load'.freeze
  Cdoc_root = 'doc_root'.freeze
  Cdocroot = 'docroot'.freeze # This is deprecated and is only used in the webrick handler.  Remember to remove it when the webrick handler is reworked.
  Cdocroot_caching = 'docroot_caching'.freeze
  CdynamicString = 'dynamicString'.freeze
  Celement = 'element'.freeze
  Cen = 'en'.freeze
  Cerror = 'error'.freeze
  Cexceptions = 'exceptions'.freeze
  Cfalse = 'false'.freeze
  CFALSE = 'false'.freeze
  Cfatal = 'fatal'.freeze
  Cfile = 'file'.freeze
  Cfilename = 'filename'.freeze
  Cfiles = 'files'.freeze
  Cforce = 'force'.freeze
  CEIN = 'EIN'.freeze
  CExpires = 'Expires'.freeze
  CGET = 'GET'.freeze
  CHash = 'Hash'.freeze
  CHEAD = 'HEAD'.freeze
  Cheight = 'height'.freeze
  Chostname = 'hostname'.freeze
  CHOST = 'HOST'.freeze
  Chost = 'host'.freeze
  Chosts = 'hosts'.freeze
  Chref = 'href'.freeze
  CHTTP_ = 'HTTP_'.freeze
  CHTTP_ACCEPT_LANGUAGE = 'HTTP_ACCEPT_LANGUAGE'.freeze
  CHTTP_CONTENT_LENGTH = 'HTTP_CONTENT_LENGTH'.freeze
  CHTTP_HOST = 'HTTP_HOST'.freeze
  CHTTP_COOKIE = 'HTTP_COOKIE'.freeze
  Cid = 'id'.freeze
  CIF_MODIFIED_SINCE = 'IF-MODIFIED-SINCE'.freeze
  Cimage = 'image'.freeze
  Cimage_path = 'image_path'.freeze
  Cinfo = 'info'.freeze
  Cinterval = 'interval'.freeze
  Ciowa_log = 'iowa_log'.freeze
  Ciowa_path = 'iowa_path'.freeze
  Ciowa_root = 'iowa_root'.freeze
  Cips = 'ips'.freeze
  Citem = 'item'.freeze
  Ckey = 'key'.freeze
  Cklass = 'klass'.freeze
  Clabel = 'label'.freeze
  Clast_modification = 'last_modification'.freeze
  Clibrary = 'library'.freeze
  Clink = 'link'.freeze
  Clist = 'list'.freeze
  CLocation = 'Location'.freeze
  Clog_root = 'log_root'.freeze
  Clogger = 'logger'.freeze
  Clogging = 'logging'.freeze
  Clonely_tag_terminator = ' />'.freeze
  CMain = 'Main'.freeze
  Cmapfile = 'mapfile'.freeze
  Cmaxage = 'maxage'.freeze
  Cmaxfiles = 'maxfiles'.freeze
  Cmaxsize = 'maxsize'.freeze
  Cmethod = 'method'.freeze
  Cminlevel = 'minlevel'.freeze
  Cmodel = 'model'.freeze
  CMOD_RUBY = 'MOD_RUBY'.freeze
  Cmultiple = 'multiple'.freeze
  Cname = 'name'.freeze
  COK = 'OK'.freeze
  Cpage = 'page'.freeze
  Cpagecache = 'pagecache'.freeze
  Cparams = 'params'.freeze
  Cpath = 'path'.freeze
  CPATH_INFO = 'PATH_INFO'.freeze
  Cpath_query_interval = 'path_query_interval'.freeze
  Cpolicy = 'policy'.freeze
  Cport = 'port'.freeze
  CPOST = 'POST'.freeze
  Cplural = 'plural'.freeze
  CPUT = 'PUT'.freeze
  CQUERY_STRING = 'QUERY_STRING'.freeze
  Cpost = 'post'.freeze
  Cradio = 'radio'.freeze
  Crefresh = 'refresh'.freeze
  Creload_interval = 'reload_interval'.freeze
  Crequest_cacheable = 'request_cacheable'.freeze
  CREQUEST_METHOD = 'REQUEST_METHOD'.freeze
  CREQUEST_URI = 'REQUEST_URI'.freeze
  Croot_path = 'root_path'.freeze
  Croot_url = 'root_url'.freeze
  Cscreens = 'screens'.freeze
  Cselected = 'selected'.freeze
  Cserialize_templates = 'serialize_templates'.freeze
  CServer = 'Server'.freeze
  CSERVER_NAME = 'SERVER_NAME'.freeze
  Cservice = 'service'.freeze
  Csession = 'session'.freeze
  Csessioncache = 'sessioncache'.freeze
  Cshow = 'show'.freeze
  Csingular = 'singular'.freeze
  Csocket = 'socket'.freeze
  Csrc = 'src'.freeze
  Csubmit = 'submit'.freeze
  Ctagclass = 'tagclass'.freeze
  Ctag = 'tag'.freeze
  CtemplateRoot = 'templateRoot'.freeze
  Ctext_html = 'text/html'.freeze
  Ctext_javascript = 'text/javascript'.freeze
  Ctitle = 'title'.freeze
  Ctrue = 'true'.freeze
  CTRUE = 'TRUE'.freeze
  Cttl = 'ttl'.freeze
  Ctype = 'type'.freeze
  Cupdate = 'update'.freeze
  Cuse_lockfile = 'use_lockfile'.freeze
  CUser_agent = 'User_agent'.freeze
  CUSER_AGENT = 'USER-AGENT'.freeze
  CUserAgent = 'User-Agent'.freeze
  Cvalue = 'value'.freeze
  Cvariation = 'variation'.freeze
  Cwarn = 'warn'.freeze
  Cwebrick = 'webrick'.freeze
  Cwidth = 'width'.freeze
  CX_FORWARDED_HOST = 'X-FORWARDED-HOST'.freeze
  
  CR_amp = /&/.freeze
  CR_equal = /=/.freeze

end