tools/pas2c/Main.hs
author Wuzzy <Wuzzy2@mail.ru>
Sun, 13 Jan 2019 15:54:10 +0100
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permissions -rw-r--r--
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module Main( main ) where
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import System.Console.GetOpt
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import System.Environment
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import System.Exit
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import System.IO
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import Data.Maybe( fromMaybe, isJust, fromJust )
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import Data.List (find, intercalate)
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import Control.Monad
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import Pas2C
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main = do
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    args <- getArgs
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    if length args == 0
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    then do
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        name <- getProgName
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        hPutStrLn stderr $ usageInfo header options
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        exitFailure
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    else do
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        case getOpt RequireOrder options args of
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          (flags, [],      []) | enoughFlags flags -> do
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                let m = flag flags isName
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                let i = flag flags isInput
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                let o = flag flags isOutput
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                let a = fromMaybe o $ liftM extractString $ find isAlt flags
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                let symbols = ["PAS2C", "FPC"] ++ (map extractString $ filter isSymbol flags)
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                hPutStrLn stdout $ "--------Pas2C Config--------"
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                hPutStrLn stdout $ "Main module: " ++ m
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                hPutStrLn stdout $ "Input path : " ++ i
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                hPutStrLn stdout $ "Output path: " ++ o
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                hPutStrLn stdout $ "Altern path: " ++ a
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                hPutStrLn stdout $ "Symbols defined: " ++ (intercalate ", " symbols)
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                hPutStrLn stdout $ "----------------------------"
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                pas2C m (i++"/") (o++"/") (a++"/") symbols
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                hPutStrLn stdout $ "----------------------------"
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                      | otherwise ->  error $ usageInfo header options
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          (_,     nonOpts, [])     -> error $ "unrecognized arguments: " ++ unwords nonOpts
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          (_,     _,       msgs)   -> error $ usageInfo header options
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    where
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        header = "Freepascal to C conversion! Please specify -n -i -o options.\n"
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        enoughFlags f = and $ map (isJust . flip find f) [isName, isInput, isOutput]
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        flag f = extractString . fromJust . flip find f
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data Flag = HelpMessage
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          | Name String
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          | Input String
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          | Output String
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          | Alternate String
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          | Symbol String
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extractString :: Flag -> String
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extractString (Name s) = s
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extractString (Input s) = s
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extractString (Output s) = s
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extractString (Alternate s) = s
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extractString (Symbol s) = s
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extractString _ = undefined
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isName, isInput, isOutput, isAlt, isSymbol :: Flag -> Bool
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isName (Name _) = True
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isName _ = False
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isInput (Input _) = True
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isInput _ = False
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isOutput (Output _) = True
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isOutput _ = False
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isAlt (Alternate _) = True
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isAlt _ = False
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isSymbol (Symbol _) = True
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isSymbol _ = False
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options :: [OptDescr Flag]
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options = [
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    Option ['h'] ["help"]      (NoArg HelpMessage)      "print this help message",
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    Option ['n'] ["name"]      (ReqArg Name "MAIN")     "name of the main Pascal module",
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    Option ['i'] ["input"]     (ReqArg Input "DIR")     "input directory, where .pas files will be read",
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    Option ['o'] ["output"]    (ReqArg Output "DIR")    "output directory, where .c/.h files will be written",
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    Option ['a'] ["alternate"] (ReqArg Alternate "DIR") "alternate input directory, for out of source builds",
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    Option ['d'] ["define"]    (ReqArg Symbol "SYMBOL") "define symbol"
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  ]
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