hsp-0.2: HSP/Exception.hs

{-# OPTIONS -fglasgow-exts #-}
-----------------------------------------------------------------------------
-- |
-- Module      :  HSP.Exception
-- Copyright   :  (c) Niklas Broberg 2004,
-- License     :  BSD-style (see the file LICENSE.txt)
-- 
-- Maintainer  :  Niklas Broberg, d00nibro@dtek.chalmers.se
-- Stability   :  experimental
-- Portability :  requires undecidable and overlapping instances
--
-- Defines a datatype for runtime exceptions that may arise during
-- the evaluation of a HSP page.
-----------------------------------------------------------------------------
module HSP.Exception where

import Data.Typeable

data Exception
	= WrongApplicationType	-- ^ User tries to infer the wrong type
				-- for the data stored in the 'Application' object.
	| NoApplication		-- ^ User tries to access application data in cgi mode.
	| NoOutHeaders		-- ^ User tries to add outgoing headers in cgi mode.
	| ParameterLookupFailed String	-- ^ User tried to do an irrefutable parameter lookup
					-- that failed.

 deriving (Eq, Show, Typeable)