gameServer/Data/TConfig.hs
author nemo
Tue, 21 May 2013 16:13:32 -0400
changeset 9026 f6074540bab2
parent 4995 d3ca68e4860e
permissions -rw-r--r--
Add gstFrozen state to mines/gears in range on frozen land creation, and set the mines to dud state. gstFrozen does nothing yet. Visually or otherwise.
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-- Module      : Data.TConfig
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-- Copyright   : (c) Anthony Simpson 2009
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-- License     : BSD3
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--
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-- Maintainer  : DiscipleRayne@gmail.com
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-- Stability   : relatively stable
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-- Portability : portable
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---------------------------------------------------
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{-|
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  A small and simple text file configuration
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  library written in Haskell. It is similar
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  to the INI file format, but lacks a few of
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  it's features, such as sections. It is
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  suitable for simple games that need to
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  keep track of certain information between
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  plays.
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-}
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module Data.TConfig
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    (
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     getValue
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   , repConfig
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   , readConfig
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   , writeConfig
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   , remKey
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   , addKey
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   , Conf ()
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   ) where
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import Data.Char
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import qualified Data.Map as M
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import Control.Monad
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type Key   = String
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type Value = String
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type Conf  = M.Map Key Value
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-- |Adds a key and value to the end of the configuration.
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addKey :: Key -> Value -> Conf -> Conf
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addKey = M.insert
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-- |Utility function.
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-- Removes a key and its value from the configuration.
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remKey :: Key -> Conf -> Conf
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remKey = M.delete
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-- |Utility function. Searches a configuration for a
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-- key, and returns its value.
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getValue :: Key -> Conf -> Maybe Value
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getValue = M.lookup
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-- |Utility function. Replaces the value
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-- associated with a key in a configuration.
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repConfig :: Key -> Value -> Conf -> Conf
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repConfig k rv conf = let f _ = Just rv
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                      in M.alter f k conf
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-- |Reads a file and parses to a Map String String.
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readConfig :: FilePath -> IO Conf
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readConfig path = liftM (M.fromList . map ((\(a, b) -> (filter (not . isSpace) a, dropWhile isSpace $ tail b)) . break (== '=')) . filter (not . null) . lines) $ readFile path
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-- |Parses a parsed configuration back to a file.
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writeConfig :: FilePath -> Conf -> IO ()
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writeConfig path = writeFile path . unlines . map (\(a, b) -> a ++ " = " ++ b) . M.toList