    -- |
    -- Statistics for per-module compilations
    --
    -- (c) The GRASP/AQUA Project, Glasgow University, 1993-1998
    --
    module HscStats ( ppSourceStats ) where

    import Bag
    import HsSyn
    import Outputable
    import RdrName
    import SrcLoc
    import Util

    import Data.Char

    -- | Source Statistics
    ppSourceStats :: Bool -> Located (HsModule RdrName) -> SDoc
    ppSourceStats short (L _ (HsModule _ exports imports ldecls _ _))
      = (if short then hcat else vcat)
            (map pp_val
                [("ExportAll        ", export_all), -- 1 if no export list
                 ("ExportDecls      ", export_ds),
                 ("ExportModules    ", export_ms),
                 ("Imports          ", imp_no),
                 ("  ImpSafe        ", imp_safe),
                 ("  ImpQual        ", imp_qual),
                 ("  ImpAs          ", imp_as),
                 ("  ImpAll         ", imp_all),
                 ("  ImpPartial     ", imp_partial),
                 ("  ImpHiding      ", imp_hiding),
                 ("FixityDecls      ", fixity_sigs),
                 ("DefaultDecls     ", default_ds),
                 ("TypeDecls        ", type_ds),
                 ("DataDecls        ", data_ds),
                 ("NewTypeDecls     ", newt_ds),
                 ("TypeFamilyDecls  ", type_fam_ds),
                 ("DataConstrs      ", data_constrs),
                 ("DataDerivings    ", data_derivs),
                 ("ClassDecls       ", class_ds),
                 ("ClassMethods     ", class_method_ds),
                 ("DefaultMethods   ", default_method_ds),
                 ("InstDecls        ", inst_ds),
                 ("InstMethods      ", inst_method_ds),
                 ("InstType         ", inst_type_ds),
                 ("InstData         ", inst_data_ds),
                 ("TypeSigs         ", bind_tys),
                 ("GenericSigs      ", generic_sigs),
                 ("ValBinds         ", val_bind_ds),
                 ("FunBinds         ", fn_bind_ds),
                 ("PatSynBinds      ", patsyn_ds),
                 ("InlineMeths      ", method_inlines),
                 ("InlineBinds      ", bind_inlines),
                 ("SpecialisedMeths ", method_specs),
                 ("SpecialisedBinds ", bind_specs)
                ])
      where
        decls = map unLoc ldecls

        pp_val (_, 0) = empty
        pp_val (str, n)
          | not short   = hcat [text str, int n]
          | otherwise   = hcat [text (trim str), equals, int n, semi]

        trim ls    = takeWhile (not.isSpace) (dropWhile isSpace ls)

        (fixity_sigs, bind_tys, bind_specs, bind_inlines, generic_sigs)
            = count_sigs [d | SigD d <- decls]
                    -- NB: this omits fixity decls on local bindings and
                    -- in class decls. ToDo

        tycl_decls = [d | TyClD d <- decls]
        (class_ds, type_ds, data_ds, newt_ds, type_fam_ds) =
          countTyClDecls tycl_decls

        inst_decls = [d | InstD d <- decls]
        inst_ds    = length inst_decls
        default_ds = count (\ x -> case x of { DefD{} -> True; _ -> False}) decls
        val_decls  = [d | ValD d <- decls]

        real_exports = case exports of { Nothing -> []; Just (L _ es) -> es }
        n_exports    = length real_exports
        export_ms    = count (\ e -> case unLoc e of { IEModuleContents{} -> True;_ -> False})
                             real_exports
        export_ds    = n_exports - export_ms
        export_all   = case exports of { Nothing -> 1; _ -> 0 }

        (val_bind_ds, fn_bind_ds, patsyn_ds)
            = sum3 (map count_bind val_decls)

        (imp_no, imp_safe, imp_qual, imp_as, imp_all, imp_partial, imp_hiding)
            = sum7 (map import_info imports)
        (data_constrs, data_derivs)
            = sum2 (map data_info tycl_decls)
        (class_method_ds, default_method_ds)
            = sum2 (map class_info tycl_decls)
        (inst_method_ds, method_specs, method_inlines, inst_type_ds, inst_data_ds)
            = sum5 (map inst_info inst_decls)

        count_bind (PatBind { pat_lhs = L _ (VarPat _) }) = (1,0,0)
        count_bind (PatBind {})                           = (0,1,0)
        count_bind (FunBind {})                           = (0,1,0)
        count_bind (PatSynBind {})                        = (0,0,1)
        count_bind b = pprPanic "count_bind: Unhandled binder" (ppr b)

        count_sigs sigs = sum5 (map sig_info sigs)

        sig_info (FixSig _)       = (1,0,0,0,0)
        sig_info (TypeSig _ _ _)  = (0,1,0,0,0)
        sig_info (SpecSig _ _ _)  = (0,0,1,0,0)
        sig_info (InlineSig _ _)  = (0,0,0,1,0)
        sig_info (GenericSig _ _) = (0,0,0,0,1)
        sig_info _                = (0,0,0,0,0)

        import_info (L _ (ImportDecl { ideclSafe = safe, ideclQualified = qual
                                     , ideclAs = as, ideclHiding = spec }))
            = add7 (1, safe_info safe, qual_info qual, as_info as, 0,0,0) (spec_info spec)
        safe_info = qual_info
        qual_info False  = 0
        qual_info True   = 1
        as_info Nothing  = 0
        as_info (Just _) = 1
        spec_info Nothing           = (0,0,0,0,1,0,0)
        spec_info (Just (False, _)) = (0,0,0,0,0,1,0)
        spec_info (Just (True, _))  = (0,0,0,0,0,0,1)

        data_info (DataDecl { tcdDataDefn = HsDataDefn { dd_cons = cs
                                                       , dd_derivs = derivs}})
            = (length cs, case derivs of Nothing       -> 0
                                         Just (L _ ds) -> length ds)
        data_info _ = (0,0)

        class_info decl@(ClassDecl {})
            = (classops, addpr (sum3 (map count_bind methods)))
          where
            methods = map unLoc $ bagToList (tcdMeths decl)
            (_, classops, _, _, _) = count_sigs (map unLoc (tcdSigs decl))
        class_info _ = (0,0)

        inst_info (TyFamInstD {}) = (0,0,0,1,0)
        inst_info (DataFamInstD {}) = (0,0,0,0,1)
        inst_info (ClsInstD { cid_inst = ClsInstDecl {cid_binds = inst_meths
                                                     , cid_sigs = inst_sigs
                                                     , cid_tyfam_insts = ats
                                                     , cid_datafam_insts = adts } })
            = case count_sigs (map unLoc inst_sigs) of
                (_,_,ss,is,_) ->
                      (addpr (sum3 (map count_bind methods)),
                       ss, is, length ats, length adts)
          where
            methods = map unLoc $ bagToList inst_meths

        -- TODO: use Sum monoid
        addpr :: (Int,Int,Int) -> Int
        sum2 :: [(Int, Int)] -> (Int, Int)
        sum3 :: [(Int, Int, Int)] -> (Int, Int, Int)
        sum5 :: [(Int, Int, Int, Int, Int)] -> (Int, Int, Int, Int, Int)
        sum7 :: [(Int, Int, Int, Int, Int, Int, Int)] -> (Int, Int, Int, Int, Int, Int, Int)
        add7 :: (Int, Int, Int, Int, Int, Int, Int) -> (Int, Int, Int, Int, Int, Int, Int)
             -> (Int, Int, Int, Int, Int, Int, Int)

        addpr (x,y,z) = x+y+z
        sum2 = foldr add2 (0,0)
          where
            add2 (x1,x2) (y1,y2) = (x1+y1,x2+y2)
        sum3 = foldr add3 (0,0,0)
          where
            add3 (x1,x2,x3) (y1,y2,y3) = (x1+y1,x2+y2,x3+y3)
        sum5 = foldr add5 (0,0,0,0,0)
          where
            add5 (x1,x2,x3,x4,x5) (y1,y2,y3,y4,y5) = (x1+y1,x2+y2,x3+y3,x4+y4,x5+y5)
        sum7 = foldr add7 (0,0,0,0,0,0,0)

        add7 (x1,x2,x3,x4,x5,x6,x7) (y1,y2,y3,y4,y5,y6,y7) = (x1+y1,x2+y2,x3+y3,x4+y4,x5+y5,x6+y6,x7+y7)