+-- These -X<blah> flags can all be reversed with -Xno-<blah>
+xFlags :: [(String, DynFlag)]
+xFlags = [
+ ( "CPP", Opt_Cpp ),
+ ( "PatternGuards", Opt_PatternGuards ),
+ ( "UnicodeSyntax", Opt_UnicodeSyntax ),
+ ( "MagicHash", Opt_MagicHash ),
+ ( "PolymorphicComponents", Opt_PolymorphicComponents ),
+ ( "ExistentialQuantification", Opt_ExistentialQuantification ),
+ ( "KindSignatures", Opt_KindSignatures ),
+ ( "PatternSignatures", Opt_PatternSignatures ),
+ ( "EmptyDataDecls", Opt_EmptyDataDecls ),
+ ( "ParallelListComp", Opt_ParallelListComp ),
+ ( "FI", Opt_FFI ), -- support `-ffi'...
+ ( "FFI", Opt_FFI ), -- ...and also `-fffi'
+ ( "ForeignFunctionInterface", Opt_FFI ),
+ ( "UnliftedFFITypes", Opt_UnliftedFFITypes ),
+
+ ( "PartiallyAppliedClosedTypeSynonyms", Opt_PartiallyAppliedClosedTypeSynonyms ),
+ ( "Rank2Types", Opt_Rank2Types ),
+ ( "RankNTypes", Opt_RankNTypes ),
+ ( "TypeOperators", Opt_TypeOperators ),
+ ( "RecursiveDo", Opt_RecursiveDo ),
+ ( "Arrows", Opt_Arrows ), -- arrow syntax
+ ( "Parr", Opt_PArr ),
+
+ ( "TH", Opt_TH ), -- support -fth
+ ( "TemplateHaskelll", Opt_TH ),
+
+ ( "Generics", Opt_Generics ),
+
+ ( "ImplicitPrelude", Opt_ImplicitPrelude ), -- On by default
+
+ ( "RecordWildCards", Opt_RecordWildCards ),
+ ( "RecordPuns", Opt_RecordPuns ),
+ ( "DisambiguateRecordFields", Opt_DisambiguateRecordFields ),
+
+ ( "OverloadedStrings", Opt_OverloadedStrings ),
+ ( "GADTs", Opt_GADTs ),
+ ( "TypeFamilies", Opt_TypeFamilies ),
+ ( "BangPatterns", Opt_BangPatterns ),
+ ( "MonomorphismRestriction", Opt_MonomorphismRestriction ), -- On by default
+ ( "MonoPatBinds", Opt_MonoPatBinds ), -- On by default (which is not strictly H98)
+ ( "RelaxedPolyRec", Opt_RelaxedPolyRec),
+ ( "ExtendedDefaultRules", Opt_ExtendedDefaultRules ),
+ ( "ImplicitParams", Opt_ImplicitParams ),
+ ( "ScopedTypeVariables", Opt_ScopedTypeVariables ),
+ ( "UnboxedTuples", Opt_UnboxedTuples ),
+ ( "ExpressionSignaturesUnboxedTuples", Opt_ExpressionSignaturesUnboxedTuples ),
+ ( "TypeSynonymUnboxedTuples", Opt_TypeSynonymUnboxedTuples ),
+ ( "DeriveDataTypeable", Opt_DeriveDataTypeable ),
+ ( "TypeSynonymInstances", Opt_TypeSynonymInstances ),
+ ( "FlexibleContexts", Opt_FlexibleContexts ),
+ ( "FlexibleInstances", Opt_FlexibleInstances ),
+ ( "ConstrainedClassMethods", Opt_ConstrainedClassMethods ),
+ ( "MultiParamTypeClasses", Opt_MultiParamTypeClasses ),
+ ( "FunctionalDependencies", Opt_FunctionalDependencies ),
+ ( "GeneralizedNewtypeDeriving", Opt_GeneralizedNewtypeDeriving ),
+ ( "AllowOverlappingInstances", Opt_AllowOverlappingInstances ),
+ ( "AllowUndecidableInstances", Opt_AllowUndecidableInstances ),
+ ( "AllowIncoherentInstances", Opt_AllowIncoherentInstances )
+ ]
+
+impliedFlags :: [(DynFlag, [DynFlag])]
+impliedFlags = [
+ ( Opt_GADTs, [Opt_RelaxedPolyRec] ) -- We want type-sig variables to be completely rigid for GADTs
+ ]
+
+glasgowExtsFlags = [ Opt_GlasgowExts
+ , Opt_PrintExplicitForalls
+ , Opt_FFI
+ , Opt_UnliftedFFITypes
+ , Opt_GADTs
+ , Opt_ImplicitParams
+ , Opt_ScopedTypeVariables
+ , Opt_UnboxedTuples
+ , Opt_ExpressionSignaturesUnboxedTuples
+ , Opt_TypeSynonymUnboxedTuples
+ , Opt_TypeSynonymInstances
+ , Opt_DeriveDataTypeable
+ , Opt_FlexibleContexts
+ , Opt_FlexibleInstances
+ , Opt_ConstrainedClassMethods
+ , Opt_MultiParamTypeClasses
+ , Opt_FunctionalDependencies
+ , Opt_MagicHash
+ , Opt_PolymorphicComponents
+ , Opt_ExistentialQuantification
+ , Opt_UnicodeSyntax
+ , Opt_PatternGuards
+ , Opt_PartiallyAppliedClosedTypeSynonyms
+ , Opt_RankNTypes
+ , Opt_TypeOperators
+ , Opt_RecursiveDo
+ , Opt_ParallelListComp
+ , Opt_EmptyDataDecls
+ , Opt_KindSignatures
+ , Opt_PatternSignatures
+ , Opt_GeneralizedNewtypeDeriving
+ , Opt_TypeFamilies ]
+
+------------------
+isNoFlag, isFlag :: [(String,a)] -> String -> Bool
+
+isFlag flags f = is_flag flags (normaliseFlag f)
+
+isNoFlag flags no_f
+ | Just f <- noFlag_maybe (normaliseFlag no_f) = is_flag flags f
+ | otherwise = False
+
+is_flag flags nf = any (\(ff,_) -> normaliseFlag ff == nf) flags
+ -- nf is normalised alreadly
+
+------------------
+getFlag, getNoFlag :: [(String,a)] -> String -> a
+
+getFlag flags f = get_flag flags (normaliseFlag f)
+
+getNoFlag flags f = get_flag flags (fromJust (noFlag_maybe (normaliseFlag f)))
+ -- The flag should be a no-flag already
+
+get_flag flags nf = case [ opt | (ff, opt) <- flags, normaliseFlag ff == nf] of
+ (o:os) -> o
+ [] -> panic ("get_flag " ++ nf)
+
+------------------
+noFlag_maybe :: String -> Maybe String
+-- The input is normalised already
+noFlag_maybe ('n' : 'o' : f) = Just f
+noFlag_maybe other = Nothing
+
+normaliseFlag :: String -> String
+-- Normalise a option flag by
+-- * map to lower case
+-- * removing hyphens
+-- Thus: -X=overloaded-strings or -XOverloadedStrings
+normaliseFlag [] = []
+normaliseFlag ('-':s) = normaliseFlag s
+normaliseFlag (c:s) = toLower c : normaliseFlag s