mirror of
https://github.com/GrammaticalFramework/gf-core.git
synced 2026-04-11 13:59:31 -06:00
585 lines
24 KiB
Haskell
585 lines
24 KiB
Haskell
module GF.Infra.Option
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(
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-- * Option types
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Options,
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Flags(..),
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Mode(..), Phase(..), Verbosity(..), Encoding(..), OutputFormat(..),
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SISRFormat(..), Optimization(..), CFGTransform(..), HaskellOption(..),
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Dump(..), Printer(..), Recomp(..), BuildParser(..),
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-- * Option parsing
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parseOptions, parseModuleOptions,
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-- * Option pretty-printing
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optionsGFO,
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optionsPGF,
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-- * Option manipulation
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addOptions, concatOptions, noOptions,
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modifyFlags,
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helpMessage,
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-- * Checking specific options
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flag, cfgTransform, haskellOption,
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isLexicalCat,
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-- * Setting specific options
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setOptimization, setCFGTransform,
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-- * Convenience methods for checking options
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verbAtLeast, dump
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) where
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import Control.Monad
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import Data.Char (toLower)
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import Data.List
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import Data.Maybe
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import GF.Infra.GetOpt
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--import System.Console.GetOpt
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import System.FilePath
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import GF.Data.ErrM
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import Data.Set (Set)
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import qualified Data.Set as Set
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usageHeader :: String
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usageHeader = unlines
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["Usage: gfc [OPTIONS] [FILE [...]]",
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"",
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"How each FILE is handled depends on the file name suffix:",
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"",
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".gf Normal or old GF source, will be compiled.",
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".gfo Compiled GF source, will be loaded as is.",
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".gfe Example-based GF source, will be converted to .gf and compiled.",
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".ebnf Extended BNF format, will be converted to .gf and compiled.",
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".cf Context-free (BNF) format, will be converted to .gf and compiled.",
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"",
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"If multiple FILES are given, they must be normal GF source, .gfo or .gfe files.",
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"For the other input formats, only one file can be given.",
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"",
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"Command-line options:"]
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helpMessage :: String
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helpMessage = usageInfo usageHeader optDescr
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-- FIXME: do we really want multi-line errors?
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errors :: [String] -> Err a
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errors = fail . unlines
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-- Types
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data Mode = ModeVersion | ModeHelp | ModeInteractive | ModeRun | ModeCompiler
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deriving (Show,Eq,Ord)
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data Verbosity = Quiet | Normal | Verbose | Debug
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deriving (Show,Eq,Ord,Enum,Bounded)
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data Phase = Preproc | Convert | Compile | Link
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deriving (Show,Eq,Ord)
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data Encoding = UTF_8 | ISO_8859_1 | CP_1251
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deriving (Eq,Ord)
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data OutputFormat = FmtPGFPretty
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| FmtJavaScript
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| FmtHaskell
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| FmtProlog
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| FmtProlog_Abs
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| FmtBNF
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| FmtEBNF
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| FmtRegular
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| FmtNoLR
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| FmtSRGS_XML
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| FmtSRGS_XML_NonRec
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| FmtSRGS_ABNF
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| FmtSRGS_ABNF_NonRec
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| FmtJSGF
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| FmtGSL
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| FmtVoiceXML
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| FmtSLF
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| FmtRegExp
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| FmtFA
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deriving (Eq,Ord)
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data SISRFormat =
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-- | SISR Working draft 1 April 2003
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-- <http://www.w3.org/TR/2003/WD-semantic-interpretation-20030401/>
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SISR_WD20030401
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| SISR_1_0
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deriving (Show,Eq,Ord)
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data Optimization = OptStem | OptCSE | OptExpand | OptParametrize | OptValues
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deriving (Show,Eq,Ord)
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data CFGTransform = CFGNoLR
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| CFGRegular
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| CFGTopDownFilter
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| CFGBottomUpFilter
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| CFGStartCatOnly
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| CFGMergeIdentical
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| CFGRemoveCycles
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deriving (Show,Eq,Ord)
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data HaskellOption = HaskellNoPrefix | HaskellGADT | HaskellLexical
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deriving (Show,Eq,Ord)
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data Warning = WarnMissingLincat
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deriving (Show,Eq,Ord)
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data Dump = DumpRebuild | DumpExtend | DumpRename | DumpTypeCheck | DumpRefresh | DumpOptimize | DumpCanon
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deriving (Show,Eq,Ord)
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-- | Pretty-printing options
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data Printer = PrinterStrip -- ^ Remove name qualifiers.
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deriving (Show,Eq,Ord)
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data Recomp = AlwaysRecomp | RecompIfNewer | NeverRecomp
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deriving (Show,Eq,Ord)
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data BuildParser = BuildParser | DontBuildParser | BuildParserOnDemand
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deriving (Show,Eq,Ord)
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data Flags = Flags {
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optMode :: Mode,
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optStopAfterPhase :: Phase,
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optVerbosity :: Verbosity,
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optShowCPUTime :: Bool,
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optEmitGFO :: Bool,
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optGFODir :: FilePath,
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optOutputFormats :: [OutputFormat],
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optSISR :: Maybe SISRFormat,
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optHaskellOptions :: Set HaskellOption,
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optLexicalCats :: Set String,
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optOutputFile :: Maybe FilePath,
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optOutputDir :: Maybe FilePath,
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optRecomp :: Recomp,
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optPrinter :: [Printer],
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optProb :: Bool,
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optRetainResource :: Bool,
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optName :: Maybe String,
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optAbsName :: Maybe String,
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optCncName :: Maybe String,
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optResName :: Maybe String,
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optPreprocessors :: [String],
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optEncoding :: Encoding,
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optOptimizations :: Set Optimization,
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optCFGTransforms :: Set CFGTransform,
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optLibraryPath :: [FilePath],
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optStartCat :: Maybe String,
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optSpeechLanguage :: Maybe String,
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optLexer :: Maybe String,
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optUnlexer :: Maybe String,
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optErasing :: Bool,
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optBuildParser :: BuildParser,
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optWarnings :: [Warning],
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optDump :: [Dump]
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}
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deriving (Show)
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newtype Options = Options (Flags -> Flags)
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instance Show Options where
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show (Options o) = show (o defaultFlags)
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-- Option parsing
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parseOptions :: [String] -> Err (Options, [FilePath])
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parseOptions args
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| not (null errs) = errors errs
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| otherwise = do opts <- liftM concatOptions $ sequence optss
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return (opts, files)
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where (optss, files, errs) = getOpt RequireOrder optDescr args
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parseModuleOptions :: [String] -> Err Options
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parseModuleOptions args = do (opts,nonopts) <- parseOptions args
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if null nonopts
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then return opts
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else errors $ map ("Non-option among module options: " ++) nonopts
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-- Showing options
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-- | Pretty-print the options that are preserved in .gfo files.
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optionsGFO :: Options -> [(String,String)]
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optionsGFO opts = optionsPGF opts
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++ [("coding", show (flag optEncoding opts))]
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-- | Pretty-print the options that are preserved in .pgf files.
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optionsPGF :: Options -> [(String,String)]
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optionsPGF opts =
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maybe [] (\x -> [("language",x)]) (flag optSpeechLanguage opts)
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++ maybe [] (\x -> [("startcat",x)]) (flag optStartCat opts)
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++ (if flag optErasing opts then [("erasing","on")] else [])
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++ (if flag optBuildParser opts == BuildParserOnDemand then [("parser","ondemand")] else [])
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-- Option manipulation
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flag :: (Flags -> a) -> Options -> a
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flag f (Options o) = f (o defaultFlags)
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addOptions :: Options -> Options -> Options
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addOptions (Options o1) (Options o2) = Options (o2 . o1)
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noOptions :: Options
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noOptions = Options id
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concatOptions :: [Options] -> Options
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concatOptions = foldr addOptions noOptions
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modifyFlags :: (Flags -> Flags) -> Options
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modifyFlags = Options
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-- Default options
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defaultFlags :: Flags
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defaultFlags = Flags {
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optMode = ModeInteractive,
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optStopAfterPhase = Compile,
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optVerbosity = Normal,
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optShowCPUTime = False,
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optEmitGFO = True,
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optGFODir = ".",
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optOutputFormats = [],
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optSISR = Nothing,
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optHaskellOptions = Set.empty,
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optLexicalCats = Set.empty,
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optOutputFile = Nothing,
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optOutputDir = Nothing,
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optRecomp = RecompIfNewer,
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optPrinter = [],
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optProb = False,
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optRetainResource = False,
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optName = Nothing,
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optAbsName = Nothing,
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optCncName = Nothing,
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optResName = Nothing,
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optPreprocessors = [],
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optEncoding = ISO_8859_1,
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optOptimizations = Set.fromList [OptStem,OptCSE,OptExpand,OptParametrize,OptValues],
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optCFGTransforms = Set.fromList [CFGRemoveCycles, CFGBottomUpFilter,
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CFGTopDownFilter, CFGMergeIdentical],
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optLibraryPath = [],
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optStartCat = Nothing,
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optSpeechLanguage = Nothing,
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optLexer = Nothing,
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optUnlexer = Nothing,
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optErasing = False,
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optBuildParser = BuildParser,
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optWarnings = [],
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optDump = []
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}
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-- Option descriptions
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optDescr :: [OptDescr (Err Options)]
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optDescr =
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[
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Option ['?','h'] ["help"] (NoArg (mode ModeHelp)) "Show help message.",
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Option ['V'] ["version"] (NoArg (mode ModeVersion)) "Display GF version number.",
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Option ['v'] ["verbose"] (OptArg verbosity "N") "Set verbosity (default 1). -v alone is the same as -v 2.",
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Option ['q','s'] ["quiet"] (NoArg (verbosity (Just "0"))) "Quiet, same as -v 0.",
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Option [] ["batch"] (NoArg (mode ModeCompiler)) "Run in batch compiler mode.",
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Option [] ["interactive"] (NoArg (mode ModeInteractive)) "Run in interactive mode (default).",
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Option [] ["run"] (NoArg (mode ModeRun)) "Run in interactive mode, showing output only (no other messages).",
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Option ['E'] [] (NoArg (phase Preproc)) "Stop after preprocessing (with --preproc).",
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Option ['C'] [] (NoArg (phase Convert)) "Stop after conversion to .gf.",
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Option ['c'] [] (NoArg (phase Compile)) "Stop after compiling to .gfo (default) .",
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Option [] ["make"] (NoArg (liftM2 addOptions (mode ModeCompiler) (phase Link))) "Build .pgf file and other output files and exit.",
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Option [] ["cpu"] (NoArg (cpu True)) "Show compilation CPU time statistics.",
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Option [] ["no-cpu"] (NoArg (cpu False)) "Don't show compilation CPU time statistics (default).",
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Option [] ["emit-gfo"] (NoArg (emitGFO True)) "Create .gfo files (default).",
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Option [] ["no-emit-gfo"] (NoArg (emitGFO False)) "Do not create .gfo files.",
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Option [] ["gfo-dir"] (ReqArg gfoDir "DIR") "Directory to put .gfo files in (default = '.').",
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Option ['f'] ["output-format"] (ReqArg outFmt "FMT")
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(unlines ["Output format. FMT can be one of:",
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"Multiple concrete: pgf (default), gar, js, prolog, ...",
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"Single concrete only: cf, bnf, lbnf, gsl, srgs_xml, srgs_abnf, ...",
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"Abstract only: haskell, prolog_abs, ..."]),
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Option [] ["sisr"] (ReqArg sisrFmt "FMT")
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(unlines ["Include SISR tags in generated speech recognition grammars.",
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"FMT can be one of: old, 1.0"]),
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Option [] ["haskell"] (ReqArg hsOption "OPTION")
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("Turn on an optional feature when generating Haskell data types. OPTION = "
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++ concat (intersperse " | " (map fst haskellOptionNames))),
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Option [] ["lexical"] (ReqArg lexicalCat "CAT[,CAT[...]]")
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"Treat CAT as a lexical category.",
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Option ['o'] ["output-file"] (ReqArg outFile "FILE")
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"Save output in FILE (default is out.X, where X depends on output format.",
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Option ['D'] ["output-dir"] (ReqArg outDir "DIR")
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"Save output files (other than .gfc files) in DIR.",
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Option [] ["src","force-recomp"] (NoArg (recomp AlwaysRecomp))
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"Always recompile from source.",
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Option [] ["gfo","recomp-if-newer"] (NoArg (recomp RecompIfNewer))
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"(default) Recompile from source if the source is newer than the .gfo file.",
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Option [] ["gfo","no-recomp"] (NoArg (recomp NeverRecomp))
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"Never recompile from source, if there is already .gfo file.",
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Option [] ["strip"] (NoArg (printer PrinterStrip))
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"Remove name qualifiers when pretty-printing.",
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Option [] ["retain"] (NoArg (set $ \o -> o { optRetainResource = True })) "Retain opers.",
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Option [] ["prob"] (NoArg (prob True)) "Read probabilities from '--# prob' pragmas.",
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Option ['n'] ["name"] (ReqArg name "NAME")
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(unlines ["Use NAME as the name of the output. This is used in the output file names, ",
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"with suffixes depending on the formats, and, when relevant, ",
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"internally in the output."]),
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Option [] ["abs"] (ReqArg absName "NAME")
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("Use NAME as the name of the abstract syntax module generated from "
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++ "a grammar in GF 1 format."),
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Option [] ["cnc"] (ReqArg cncName "NAME")
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("Use NAME as the name of the concrete syntax module generated from "
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++ "a grammar in GF 1 format."),
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Option [] ["res"] (ReqArg resName "NAME")
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("Use NAME as the name of the resource module generated from "
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++ "a grammar in GF 1 format."),
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Option ['i'] [] (ReqArg addLibDir "DIR") "Add DIR to the library search path.",
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Option [] ["path"] (ReqArg setLibPath "DIR:DIR:...") "Set the library search path.",
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Option [] ["preproc"] (ReqArg preproc "CMD")
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(unlines ["Use CMD to preprocess input files.",
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"Multiple preprocessors can be used by giving this option multiple times."]),
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Option [] ["coding"] (ReqArg coding "ENCODING")
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("Character encoding of the source grammar, ENCODING = "
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++ concat (intersperse " | " (map fst encodings)) ++ "."),
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Option [] ["erasing"] (onOff erasing False) "Generate erasing grammar (default off).",
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Option [] ["parser"] (ReqArg buildParser "VALUE") "Build parser (default on). VALUE = on | off | ondemand",
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Option [] ["startcat"] (ReqArg startcat "CAT") "Grammar start category.",
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Option [] ["language"] (ReqArg language "LANG") "Set the speech language flag to LANG in the generated grammar.",
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Option [] ["lexer"] (ReqArg lexer "LEXER") "Use lexer LEXER.",
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Option [] ["unlexer"] (ReqArg unlexer "UNLEXER") "Use unlexer UNLEXER.",
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Option [] ["optimize"] (ReqArg optimize "OPT")
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"Select an optimization package. OPT = all | values | parametrize | none",
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Option [] ["stem"] (onOff (toggleOptimize OptStem) True) "Perform stem-suffix analysis (default on).",
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Option [] ["cse"] (onOff (toggleOptimize OptCSE) True) "Perform common sub-expression elimination (default on).",
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Option [] ["cfg"] (ReqArg cfgTransform "TRANS") "Enable or disable specific CFG transformations. TRANS = merge, no-merge, bottomup, no-bottomup, ...",
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dumpOption "rebuild" DumpRebuild,
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dumpOption "extend" DumpExtend,
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dumpOption "rename" DumpRename,
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dumpOption "tc" DumpTypeCheck,
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dumpOption "refresh" DumpRefresh,
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dumpOption "opt" DumpOptimize,
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dumpOption "canon" DumpCanon
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]
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where phase x = set $ \o -> o { optStopAfterPhase = x }
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mode x = set $ \o -> o { optMode = x }
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verbosity mv = case mv of
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Nothing -> set $ \o -> o { optVerbosity = Verbose }
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Just v -> case readMaybe v >>= toEnumBounded of
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Just i -> set $ \o -> o { optVerbosity = i }
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Nothing -> fail $ "Bad verbosity: " ++ show v
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cpu x = set $ \o -> o { optShowCPUTime = x }
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emitGFO x = set $ \o -> o { optEmitGFO = x }
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gfoDir x = set $ \o -> o { optGFODir = x }
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outFmt x = readOutputFormat x >>= \f ->
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set $ \o -> o { optOutputFormats = optOutputFormats o ++ [f] }
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sisrFmt x = case x of
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"old" -> set $ \o -> o { optSISR = Just SISR_WD20030401 }
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"1.0" -> set $ \o -> o { optSISR = Just SISR_1_0 }
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_ -> fail $ "Unknown SISR format: " ++ show x
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hsOption x = case lookup x haskellOptionNames of
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Just p -> set $ \o -> o { optHaskellOptions = Set.insert p (optHaskellOptions o) }
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Nothing -> fail $ "Unknown Haskell option: " ++ x
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++ " Known: " ++ show (map fst haskellOptionNames)
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lexicalCat x = set $ \o -> o { optLexicalCats = foldr Set.insert (optLexicalCats o) (splitBy (==',') x) }
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outFile x = set $ \o -> o { optOutputFile = Just x }
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outDir x = set $ \o -> o { optOutputDir = Just x }
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recomp x = set $ \o -> o { optRecomp = x }
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printer x = set $ \o -> o { optPrinter = x : optPrinter o }
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prob x = set $ \o -> o { optProb = x }
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name x = set $ \o -> o { optName = Just x }
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absName x = set $ \o -> o { optAbsName = Just x }
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cncName x = set $ \o -> o { optCncName = Just x }
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resName x = set $ \o -> o { optResName = Just x }
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addLibDir x = set $ \o -> o { optLibraryPath = x:optLibraryPath o }
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setLibPath x = set $ \o -> o { optLibraryPath = splitInModuleSearchPath x }
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preproc x = set $ \o -> o { optPreprocessors = optPreprocessors o ++ [x] }
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coding x = case lookup x encodings of
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Just c -> set $ \o -> o { optEncoding = c }
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Nothing -> fail $ "Unknown character encoding: " ++ x
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erasing x = set $ \o -> o { optErasing = x }
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buildParser x = do v <- case x of
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"on" -> return BuildParser
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"off" -> return DontBuildParser
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"ondemand" -> return BuildParserOnDemand
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set $ \o -> o { optBuildParser = v }
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startcat x = set $ \o -> o { optStartCat = Just x }
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language x = set $ \o -> o { optSpeechLanguage = Just x }
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lexer x = set $ \o -> o { optLexer = Just x }
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unlexer x = set $ \o -> o { optUnlexer = Just x }
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optimize x = case lookup x optimizationPackages of
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Just p -> set $ \o -> o { optOptimizations = p }
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Nothing -> fail $ "Unknown optimization package: " ++ x
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toggleOptimize x b = set $ setOptimization' x b
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cfgTransform x = let (x', b) = case x of
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'n':'o':'-':rest -> (rest, False)
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_ -> (x, True)
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in case lookup x' cfgTransformNames of
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Just t -> set $ setCFGTransform' t b
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Nothing -> fail $ "Unknown CFG transformation: " ++ x'
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++ " Known: " ++ show (map fst cfgTransformNames)
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dumpOption s d = Option [] ["dump-"++s] (NoArg (set $ \o -> o { optDump = d:optDump o})) ("Dump output of the " ++ s ++ " phase.")
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set = return . Options
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outputFormats :: [(String,OutputFormat)]
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outputFormats =
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[("pgf-pretty", FmtPGFPretty),
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("js", FmtJavaScript),
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("haskell", FmtHaskell),
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("prolog", FmtProlog),
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("prolog_abs", FmtProlog_Abs),
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("bnf", FmtBNF),
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("ebnf", FmtEBNF),
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("regular", FmtRegular),
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("nolr", FmtNoLR),
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("srgs_xml", FmtSRGS_XML),
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("srgs_xml_nonrec", FmtSRGS_XML_NonRec),
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("srgs_abnf", FmtSRGS_ABNF),
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("srgs_abnf_nonrec", FmtSRGS_ABNF_NonRec),
|
|
("jsgf", FmtJSGF),
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|
("gsl", FmtGSL),
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|
("vxml", FmtVoiceXML),
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|
("slf", FmtSLF),
|
|
("regexp", FmtRegExp),
|
|
("fa", FmtFA)]
|
|
|
|
instance Show OutputFormat where
|
|
show = lookupShow outputFormats
|
|
|
|
instance Read OutputFormat where
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|
readsPrec = lookupReadsPrec outputFormats
|
|
|
|
optimizationPackages :: [(String, Set Optimization)]
|
|
optimizationPackages =
|
|
[("all_subs", Set.fromList [OptStem,OptCSE,OptExpand,OptParametrize,OptValues]), -- deprecated
|
|
("all", Set.fromList [OptStem,OptCSE,OptExpand,OptParametrize,OptValues]),
|
|
("values", Set.fromList [OptStem,OptCSE,OptExpand,OptValues]),
|
|
("parametrize", Set.fromList [OptStem,OptCSE,OptExpand,OptParametrize]),
|
|
("none", Set.fromList [OptStem,OptCSE,OptExpand]),
|
|
("noexpand", Set.fromList [OptStem,OptCSE])]
|
|
|
|
cfgTransformNames :: [(String, CFGTransform)]
|
|
cfgTransformNames =
|
|
[("nolr", CFGNoLR),
|
|
("regular", CFGRegular),
|
|
("topdown", CFGTopDownFilter),
|
|
("bottomup", CFGBottomUpFilter),
|
|
("startcatonly", CFGStartCatOnly),
|
|
("merge", CFGMergeIdentical),
|
|
("removecycles", CFGRemoveCycles)]
|
|
|
|
haskellOptionNames :: [(String, HaskellOption)]
|
|
haskellOptionNames =
|
|
[("noprefix", HaskellNoPrefix),
|
|
("gadt", HaskellGADT),
|
|
("lexical", HaskellLexical)]
|
|
|
|
encodings :: [(String,Encoding)]
|
|
encodings =
|
|
[("utf8", UTF_8),
|
|
("cp1251", CP_1251),
|
|
("latin1", ISO_8859_1)
|
|
]
|
|
|
|
instance Show Encoding where
|
|
show = lookupShow encodings
|
|
|
|
lookupShow :: Eq a => [(String,a)] -> a -> String
|
|
lookupShow xs z = fromMaybe "lookupShow" $ lookup z [(y,x) | (x,y) <- xs]
|
|
|
|
lookupReadsPrec :: [(String,a)] -> Int -> ReadS a
|
|
lookupReadsPrec xs _ s = [(z,rest) | (x,rest) <- lex s, (y,z) <- xs, y == x]
|
|
|
|
onOff :: Monad m => (Bool -> m a) -> Bool -> ArgDescr (m a)
|
|
onOff f def = OptArg g "[on,off]"
|
|
where g ma = maybe (return def) readOnOff ma >>= f
|
|
readOnOff x = case map toLower x of
|
|
"on" -> return True
|
|
"off" -> return False
|
|
_ -> fail $ "Expected [on,off], got: " ++ show x
|
|
|
|
readOutputFormat :: Monad m => String -> m OutputFormat
|
|
readOutputFormat s =
|
|
maybe (fail $ "Unknown output format: " ++ show s) return $ lookup s outputFormats
|
|
|
|
-- FIXME: this is a copy of the function in GF.Devel.UseIO.
|
|
splitInModuleSearchPath :: String -> [FilePath]
|
|
splitInModuleSearchPath s = case break isPathSep s of
|
|
(f,_:cs) -> f : splitInModuleSearchPath cs
|
|
(f,_) -> [f]
|
|
where
|
|
isPathSep :: Char -> Bool
|
|
isPathSep c = c == ':' || c == ';'
|
|
|
|
--
|
|
-- * Convenience functions for checking options
|
|
--
|
|
|
|
verbAtLeast :: Options -> Verbosity -> Bool
|
|
verbAtLeast opts v = flag optVerbosity opts >= v
|
|
|
|
dump :: Options -> Dump -> Bool
|
|
dump opts d = flag ((d `elem`) . optDump) opts
|
|
|
|
cfgTransform :: Options -> CFGTransform -> Bool
|
|
cfgTransform opts t = Set.member t (flag optCFGTransforms opts)
|
|
|
|
haskellOption :: Options -> HaskellOption -> Bool
|
|
haskellOption opts o = Set.member o (flag optHaskellOptions opts)
|
|
|
|
isLexicalCat :: Options -> String -> Bool
|
|
isLexicalCat opts c = Set.member c (flag optLexicalCats opts)
|
|
|
|
--
|
|
-- * Convenience functions for setting options
|
|
--
|
|
|
|
setOptimization :: Optimization -> Bool -> Options
|
|
setOptimization o b = modifyFlags (setOptimization' o b)
|
|
|
|
setOptimization' :: Optimization -> Bool -> Flags -> Flags
|
|
setOptimization' o b f = f { optOptimizations = toggle o b (optOptimizations f)}
|
|
|
|
setCFGTransform :: CFGTransform -> Bool -> Options
|
|
setCFGTransform t b = modifyFlags (setCFGTransform' t b)
|
|
|
|
setCFGTransform' :: CFGTransform -> Bool -> Flags -> Flags
|
|
setCFGTransform' t b f = f { optCFGTransforms = toggle t b (optCFGTransforms f) }
|
|
|
|
toggle :: Ord a => a -> Bool -> Set a -> Set a
|
|
toggle o True = Set.insert o
|
|
toggle o False = Set.delete o
|
|
|
|
--
|
|
-- * General utilities
|
|
--
|
|
|
|
readMaybe :: Read a => String -> Maybe a
|
|
readMaybe s = case reads s of
|
|
[(x,"")] -> Just x
|
|
_ -> Nothing
|
|
|
|
toEnumBounded :: (Bounded a, Enum a, Ord a) => Int -> Maybe a
|
|
toEnumBounded i = let mi = minBound
|
|
ma = maxBound `asTypeOf` mi
|
|
in if i >= fromEnum mi && i <= fromEnum ma
|
|
then Just (toEnum i `asTypeOf` mi)
|
|
else Nothing
|
|
|
|
splitBy :: (a -> Bool) -> [a] -> [[a]]
|
|
splitBy _ [] = []
|
|
splitBy p s = case break p s of
|
|
(l, _ : t@(_ : _)) -> l : splitBy p t
|
|
(l, _) -> [l]
|
|
|
|
instance Functor OptDescr where
|
|
fmap f (Option cs ss d s) = Option cs ss (fmap f d) s
|
|
|
|
instance Functor ArgDescr where
|
|
fmap f (NoArg x) = NoArg (f x)
|
|
fmap f (ReqArg g s) = ReqArg (f . g) s
|
|
fmap f (OptArg g s) = OptArg (f . g) s
|