{-# LANGUAGE FlexibleContexts #-}
module Haddock.Backends.Hoogle (
ppHoogle
) where
import BasicTypes (OverlapFlag(..), OverlapMode(..), SourceText(..))
import InstEnv (ClsInst(..))
import Documentation.Haddock.Markup
import Haddock.GhcUtils
import Haddock.Types hiding (Version)
import Haddock.Utils hiding (out)
import HsBinds (emptyLHsBinds)
import GHC
import Outputable
import NameSet
import Data.Char
import Data.List
import Data.Maybe
import Data.Version
import System.Directory
import System.FilePath
import System.IO
prefix :: [String]
prefix = ["-- Hoogle documentation, generated by Haddock"
,"-- See Hoogle, http://www.haskell.org/hoogle/"
,""]
ppHoogle :: DynFlags -> String -> Version -> String -> Maybe (Doc RdrName) -> [Interface] -> FilePath -> IO ()
ppHoogle dflags package version synopsis prologue ifaces odir = do
let filename = package ++ ".txt"
contents = prefix ++
docWith dflags (drop 2 $ dropWhile (/= ':') synopsis) prologue ++
["@package " ++ package] ++
["@version " ++ showVersion version
| not (null (versionBranch version)) ] ++
concat [ppModule dflags i | i <- ifaces, OptHide `notElem` ifaceOptions i]
createDirectoryIfMissing True odir
h <- openFile (odir </> filename) WriteMode
hSetEncoding h utf8
hPutStr h (unlines contents)
hClose h
ppModule :: DynFlags -> Interface -> [String]
ppModule dflags iface =
"" : ppDocumentation dflags (ifaceDoc iface) ++
["module " ++ moduleString (ifaceMod iface)] ++
concatMap (ppExport dflags) (ifaceExportItems iface) ++
concatMap (ppInstance dflags) (ifaceInstances iface)
dropHsDocTy :: HsType a -> HsType a
dropHsDocTy = f
where
g (L src x) = L src (f x)
f (HsForAllTy a e) = HsForAllTy a (g e)
f (HsQualTy a e) = HsQualTy a (g e)
f (HsBangTy a b) = HsBangTy a (g b)
f (HsAppTy a b) = HsAppTy (g a) (g b)
f (HsFunTy a b) = HsFunTy (g a) (g b)
f (HsListTy a) = HsListTy (g a)
f (HsPArrTy a) = HsPArrTy (g a)
f (HsTupleTy a b) = HsTupleTy a (map g b)
f (HsOpTy a b c) = HsOpTy (g a) b (g c)
f (HsParTy a) = HsParTy (g a)
f (HsKindSig a b) = HsKindSig (g a) b
f (HsDocTy a _) = f $ unL a
f x = x
outHsType :: (SourceTextX a, OutputableBndrId a)
=> DynFlags -> HsType a -> String
outHsType dflags = out dflags . dropHsDocTy
dropComment :: String -> String
dropComment (' ':'-':'-':' ':_) = []
dropComment (x:xs) = x : dropComment xs
dropComment [] = []
outWith :: Outputable a => (SDoc -> String) -> a -> [Char]
outWith p = f . unwords . map (dropWhile isSpace) . lines . p . ppr
where
f xs | " <document comment>" `isPrefixOf` xs = f $ drop 19 xs
f (x:xs) = x : f xs
f [] = []
out :: Outputable a => DynFlags -> a -> String
out dflags = outWith $ showSDocUnqual dflags
operator :: String -> String
operator (x:xs) | not (isAlphaNum x) && x `notElem` "_' ([{" = '(' : x:xs ++ ")"
operator x = x
commaSeparate :: Outputable a => DynFlags -> [a] -> String
commaSeparate dflags = showSDocUnqual dflags . interpp'SP
ppExport :: DynFlags -> ExportItem GhcRn -> [String]
ppExport dflags ExportDecl { expItemDecl = L _ decl
, expItemMbDoc = (dc, _)
, expItemSubDocs = subdocs
, expItemFixities = fixities
} = ppDocumentation dflags dc ++ f decl
where
f (TyClD d@DataDecl{}) = ppData dflags d subdocs
f (TyClD d@SynDecl{}) = ppSynonym dflags d
f (TyClD d@ClassDecl{}) = ppClass dflags d subdocs
f (ForD (ForeignImport name typ _ _)) = [pp_sig dflags [name] (hsSigType typ)]
f (ForD (ForeignExport name typ _ _)) = [pp_sig dflags [name] (hsSigType typ)]
f (SigD sig) = ppSig dflags sig ++ ppFixities
f _ = []
ppFixities = concatMap (ppFixity dflags) fixities
ppExport _ _ = []
ppSigWithDoc :: DynFlags -> Sig GhcRn -> [(Name, DocForDecl Name)] -> [String]
ppSigWithDoc dflags (TypeSig names sig) subdocs
= concatMap mkDocSig names
where
mkDocSig n = concatMap (ppDocumentation dflags) (getDoc n)
++ [pp_sig dflags [n] (hsSigWcType sig)]
getDoc :: Located Name -> [Documentation Name]
getDoc n = maybe [] (return . fst) (lookup (unL n) subdocs)
ppSigWithDoc _ _ _ = []
ppSig :: DynFlags -> Sig GhcRn -> [String]
ppSig dflags x = ppSigWithDoc dflags x []
pp_sig :: DynFlags -> [Located Name] -> LHsType GhcRn -> String
pp_sig dflags names (L _ typ) =
operator prettyNames ++ " :: " ++ outHsType dflags typ
where
prettyNames = intercalate ", " $ map (out dflags) names
ppClass :: DynFlags -> TyClDecl GhcRn -> [(Name, DocForDecl Name)] -> [String]
ppClass dflags decl subdocs =
(out dflags decl{tcdSigs=[], tcdATs=[], tcdATDefs=[], tcdMeths=emptyLHsBinds}
++ ppTyFams) : ppMethods
where
ppMethods = concat . map (ppSig' . unLoc . add_ctxt) $ tcdSigs decl
ppSig' = flip (ppSigWithDoc dflags) subdocs
add_ctxt = addClassContext (tcdName decl) (tyClDeclTyVars decl)
ppTyFams
| null $ tcdATs decl = ""
| otherwise = (" " ++) . showSDocUnqual dflags . whereWrapper $ concat
[ map ppr (tcdATs decl)
, map (ppr . tyFamEqnToSyn . unLoc) (tcdATDefs decl)
]
whereWrapper elems = vcat'
[ text "where" <+> lbrace
, nest 4 . vcat . map (Outputable.<> semi) $ elems
, rbrace
]
tyFamEqnToSyn :: TyFamDefltEqn GhcRn -> TyClDecl GhcRn
tyFamEqnToSyn tfe = SynDecl
{ tcdLName = feqn_tycon tfe
, tcdTyVars = feqn_pats tfe
, tcdFixity = feqn_fixity tfe
, tcdRhs = feqn_rhs tfe
, tcdFVs = emptyNameSet
}
ppInstance :: DynFlags -> ClsInst -> [String]
ppInstance dflags x =
[dropComment $ outWith (showSDocForUser dflags alwaysQualify) cls]
where
cls = x { is_flag = OverlapFlag { overlapMode = NoOverlap NoSourceText
, isSafeOverlap = False } }
ppSynonym :: DynFlags -> TyClDecl GhcRn -> [String]
ppSynonym dflags x = [out dflags x]
ppData :: DynFlags -> TyClDecl GhcRn -> [(Name, DocForDecl Name)] -> [String]
ppData dflags decl@(DataDecl { tcdDataDefn = defn }) subdocs
= showData decl{ tcdDataDefn = defn { dd_cons=[],dd_derivs=noLoc [] }} :
concatMap (ppCtor dflags decl subdocs . unL) (dd_cons defn)
where
showData d = unwords $ map f $ if last xs == "=" then init xs else xs
where
xs = words $ out dflags d
nam = out dflags $ tyClDeclLName d
f w = if w == nam then operator nam else w
ppData _ _ _ = panic "ppData"
lookupCon :: DynFlags -> [(Name, DocForDecl Name)] -> Located Name -> [String]
lookupCon dflags subdocs (L _ name) = case lookup name subdocs of
Just (d, _) -> ppDocumentation dflags d
_ -> []
ppCtor :: DynFlags -> TyClDecl GhcRn -> [(Name, DocForDecl Name)] -> ConDecl GhcRn -> [String]
ppCtor dflags dat subdocs con@ConDeclH98 {}
= concatMap (lookupCon dflags subdocs) [con_name con] ++ f (getConDetails con)
where
f (PrefixCon args) = [typeSig name $ args ++ [resType]]
f (InfixCon a1 a2) = f $ PrefixCon [a1,a2]
f (RecCon (L _ recs)) = f (PrefixCon $ map cd_fld_type (map unLoc recs)) ++ concat
[(concatMap (lookupCon dflags subdocs . noLoc . selectorFieldOcc . unLoc) (cd_fld_names r)) ++
[out dflags (map (selectorFieldOcc . unLoc) $ cd_fld_names r) `typeSig` [resType, cd_fld_type r]]
| r <- map unLoc recs]
funs = foldr1 (\x y -> reL $ HsFunTy x y)
apps = foldl1 (\x y -> reL $ HsAppTy x y)
typeSig nm flds = operator nm ++ " :: " ++ outHsType dflags (unL $ funs flds)
name = commaSeparate dflags . map unL $ getConNames con
resType = apps $ map (reL . HsTyVar NotPromoted . reL) $
(tcdName dat) : [hsTyVarName v | L _ v@(UserTyVar _) <- hsQTvExplicit $ tyClDeclTyVars dat]
ppCtor dflags _dat subdocs con@ConDeclGADT {}
= concatMap (lookupCon dflags subdocs) (getConNames con) ++ f
where
f = [typeSig name (hsib_body $ con_type con)]
typeSig nm ty = operator nm ++ " :: " ++ outHsType dflags (unL ty)
name = out dflags $ map unL $ getConNames con
ppFixity :: DynFlags -> (Name, Fixity) -> [String]
ppFixity dflags (name, fixity) = [out dflags ((FixitySig [noLoc name] fixity) :: FixitySig GhcRn)]
ppDocumentation :: Outputable o => DynFlags -> Documentation o -> [String]
ppDocumentation dflags (Documentation d w) = mdoc dflags d ++ doc dflags w
doc :: Outputable o => DynFlags -> Maybe (Doc o) -> [String]
doc dflags = docWith dflags ""
mdoc :: Outputable o => DynFlags -> Maybe (MDoc o) -> [String]
mdoc dflags = docWith dflags "" . fmap _doc
docWith :: Outputable o => DynFlags -> String -> Maybe (Doc o) -> [String]
docWith _ [] Nothing = []
docWith dflags header d
= ("":) $ zipWith (++) ("-- | " : repeat "-- ") $
lines header ++ ["" | header /= "" && isJust d] ++
maybe [] (showTags . markup (markupTag dflags)) d
data Tag = TagL Char [Tags] | TagP Tags | TagPre Tags | TagInline String Tags | Str String
deriving Show
type Tags = [Tag]
box :: (a -> b) -> a -> [b]
box f x = [f x]
str :: String -> [Tag]
str a = [Str a]
markupTag :: Outputable o => DynFlags -> DocMarkup o [Tag]
markupTag dflags = Markup {
markupParagraph = box TagP,
markupEmpty = str "",
markupString = str,
markupAppend = (++),
markupIdentifier = box (TagInline "a") . str . out dflags,
markupIdentifierUnchecked = box (TagInline "a") . str . out dflags . snd,
markupModule = box (TagInline "a") . str,
markupWarning = box (TagInline "i"),
markupEmphasis = box (TagInline "i"),
markupBold = box (TagInline "b"),
markupMonospaced = box (TagInline "tt"),
markupPic = const $ str " ",
markupMathInline = const $ str "<math>",
markupMathDisplay = const $ str "<math>",
markupUnorderedList = box (TagL 'u'),
markupOrderedList = box (TagL 'o'),
markupDefList = box (TagL 'u') . map (\(a,b) -> TagInline "i" a : Str " " : b),
markupCodeBlock = box TagPre,
markupHyperlink = \(Hyperlink url mLabel) -> (box (TagInline "a") . str) (fromMaybe url mLabel),
markupAName = const $ str "",
markupProperty = box TagPre . str,
markupExample = box TagPre . str . unlines . map exampleToString,
markupHeader = \(Header l h) -> box (TagInline $ "h" ++ show l) h,
markupTable = \(Table _ _) -> str "TODO: table"
}
showTags :: [Tag] -> [String]
showTags = intercalate [""] . map showBlock
showBlock :: Tag -> [String]
showBlock (TagP xs) = showInline xs
showBlock (TagL t xs) = ['<':t:"l>"] ++ mid ++ ['<':'/':t:"l>"]
where mid = concatMap (showInline . box (TagInline "li")) xs
showBlock (TagPre xs) = ["<pre>"] ++ showPre xs ++ ["</pre>"]
showBlock x = showInline [x]
asInline :: Tag -> Tags
asInline (TagP xs) = xs
asInline (TagPre xs) = [TagInline "pre" xs]
asInline (TagL t xs) = [TagInline (t:"l") $ map (TagInline "li") xs]
asInline x = [x]
showInline :: [Tag] -> [String]
showInline = unwordsWrap 70 . words . concatMap f
where
fs = concatMap f
f (Str x) = escape x
f (TagInline s xs) = "<"++s++">" ++ (if s == "li" then trim else id) (fs xs) ++ "</"++s++">"
f x = fs $ asInline x
trim = dropWhile isSpace . reverse . dropWhile isSpace . reverse
showPre :: [Tag] -> [String]
showPre = trimFront . trimLines . lines . concatMap f
where
trimLines = dropWhile null . reverse . dropWhile null . reverse
trimFront xs = map (drop i) xs
where
ns = [length a | x <- xs, let (a,b) = span isSpace x, b /= ""]
i = if null ns then 0 else minimum ns
fs = concatMap f
f (Str x) = escape x
f (TagInline s xs) = "<"++s++">" ++ fs xs ++ "</"++s++">"
f x = fs $ asInline x
unwordsWrap :: Int -> [String] -> [String]
unwordsWrap n = f n []
where
f _ s [] = [g s | s /= []]
f i s (x:xs) | nx > i = g s : f (n - nx - 1) [x] xs
| otherwise = f (i - nx - 1) (x:s) xs
where nx = length x
g = unwords . reverse
escape :: String -> String
escape = concatMap f
where
f '<' = "<"
f '>' = ">"
f '&' = "&"
f x = [x]
vcat' :: [SDoc] -> SDoc
vcat' = foldr ($+$) empty