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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% Frown --- An LALR(k) parser generator for Haskell 98 %
% Copyright (C) 2001-2005 Ralf Hinze %
% %
% This program is free software; you can redistribute it and/or modify %
% it under the terms of the GNU General Public License (version 2) as %
% published by the Free Software Foundation. %
% %
% This program is distributed in the hope that it will be useful, %
% but WITHOUT ANY WARRANTY; without even the implied warranty of %
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the %
% GNU General Public License for more details. %
% %
% You should have received a copy of the GNU General Public License %
% along with this program; see the file COPYING. If not, write to %
% the Free Software Foundation, Inc., 59 Temple Place - Suite 330, %
% Boston, MA 02111-1307, USA. %
% %
% Contact information %
% Email: Ralf Hinze <ralf@cs.uni-bonn.de> %
% Homepage: http://www.informatik.uni-bonn.de/~ralf/ %
% Paper mail: Dr. Ralf Hinze %
% Institut für Informatik III %
% Universität Bonn %
% Römerstraße 164 %
% 53117 Bonn, Germany %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> module Options ( Format(..), Flag(..)
> , lookahead, prefix, suffix, verbose, options )
> where
> import Base
> import System.Console.GetOpt
> import Data.Char
> import System.IO
%-------------------------------= --------------------------------------------
\section{Command line options}
%-------------------------------= --------------------------------------------
> data Format = Standard | Compact | Stackless | GVStack
> deriving (Eq)
>
> data Flag = Backtrack
> | Code Format
> | Copying
> | Debug
> | Expected
> | GHC
> | Help
> | Info
> | Lookahead Int
> | Lexer
> | Noinline
> | Optimize
> | Pagewidth Int
> | Prefix String
> | Signature Bool -- `|True|' means polymorphic
> | Suffix String
> | Trace
> | Verbose
> | Version
> | Warranty
> deriving (Eq)
> lookahead :: [Flag] -> Int
> lookahead opts = head ([ k | Lookahead k <- opts ] ++ [1]) `max` 1
> prefix :: [Flag] -> String
> prefix opts = head ([ s | Prefix s <- opts ] ++ [""])
>
> suffix :: [Flag] -> String
> suffix opts = head ([ s | Suffix s <- opts ] ++ ["__"])
> verbose :: [Flag] -> String -> IO ()
> verbose opts s
> | Verbose `elem` opts = hPutStrLn stdout s
> | otherwise = return ()
> options :: [OptDescr Flag]
> options = [ Option "b" ["backtrack"] (NoArg Backtrack)
> "generate a backtracking parser"
> , Option "c" ["code"] (OptArg getCode "compact|gvstack|stackless|standard")
> "select output format"
> , Option "" ["copying"] (NoArg Copying)
> "display details of copying"
> , Option "d" ["debug"] (NoArg Debug)
> "emit debugging information"
> , Option "e" ["expected"] (NoArg Expected)
> "pass a list of expected terminals to `frown'"
> , Option "g" ["ghc"] (NoArg GHC)
> "use GHC extensions"
> , Option "h?" ["help"] (NoArg Help)
> "print this information"
> , Option "i" ["info"] (NoArg Info)
> "put additional information into generated file"
> , Option "k" ["lookahead"] (OptArg getLookahead "nat")
> "use k tokens of lookahead"
> , Option "l" ["lexer"] (NoArg Lexer)
> "use a monadic lexer (`get :: M Terminal')"
> , Option "n" ["noinline"] (NoArg Noinline)
> "generate NOINLINE pragmas"
> , Option "O" ["optimize"] (NoArg Optimize)
> "optimize parser"
> , Option "p" ["pagewidth"] (OptArg getPagewidth "nat")
> "use the specified pagewidth for pretty printing"
> , Option "" ["prefix"] (OptArg getPrefix "string")
> "use prefix for frown generated variables"
> , Option "s" ["signature"] (OptArg getSignature "mono|poly")
> "add type signatures"
> , Option "" ["suffix"] (OptArg getSuffix "string")
> "use suffix for frown generated variables"
> , Option "t" ["trace"] (NoArg Trace)
> "insert calls to tracing routines (`shift', `reduce' and `accept')"
> , Option "v" ["verbose"] (NoArg Verbose)
> "be verbose"
> , Option "" ["version"] (NoArg Version)
> "print version information"
> , Option "" ["warranty"] (NoArg Warranty)
> "display details of warranty" ]
> getCode, getLookahead, getPagewidth, getPrefix, getSuffix, getSignature
> :: Maybe String -> Flag
> getCode Nothing = Code Standard
> getCode (Just s)
> | s << "compact" = Code Compact
> | s << "gvstack" = Code GVStack
> | s << "stackless" = Code Stackless
> | otherwise = Code Standard
>
> getLookahead Nothing = Lookahead 2
> getLookahead (Just s) = Lookahead (read s)
>
> getPagewidth Nothing = Pagewidth 80
> getPagewidth (Just s) = Pagewidth (read s)
>
> getPrefix Nothing = Prefix ""
> getPrefix (Just s) = Prefix s
>
> getSuffix Nothing = Suffix ""
> getSuffix (Just s) = Suffix s
> getSignature Nothing = Signature False
> getSignature (Just s)
> | s << "mono" = Signature False
> | s << "poly" = Signature True
> | otherwise = Signature False
> (<<) :: String -> String -> Bool
> s << t = map toLower s `isPrefix` map toLower t
|
