Commit 81fc648d authored by sof's avatar sof
Browse files

[project @ 1997-08-03 02:30:42 by sof]

derived Show: added printing of labels for constructors with labelled fields; derived Read: added lexing of fields for constructors with labelled fields
parent 8e1115a7
......@@ -28,7 +28,7 @@ module TcGenDeriv (
) where
IMP_Ubiq()
IMPORT_1_3(List(partition))
IMPORT_1_3(List(partition,intersperse))
import HsSyn ( HsBinds(..), MonoBinds(..), Match(..), GRHSsAndBinds(..),
GRHS(..), HsExpr(..), HsLit(..), InPat(..), Stmt(..), DoOrListComp(..),
......@@ -38,12 +38,14 @@ import RdrHsSyn ( RdrName(..), varQual, varUnqual, mkOpApp,
SYN_IE(RdrNameMonoBinds), SYN_IE(RdrNameHsExpr), SYN_IE(RdrNamePat)
)
import BasicTypes ( IfaceFlavour(..) )
import FieldLabel ( fieldLabelName )
import Id ( GenId, isNullaryDataCon, dataConTag,
dataConRawArgTys, fIRST_TAG,
isDataCon, SYN_IE(DataCon), SYN_IE(ConTag),
SYN_IE(Id) )
dataConFieldLabels, SYN_IE(Id) )
import Maybes ( maybeToBool )
import Name ( getOccString, getOccName, getSrcLoc, occNameString, modAndOcc, OccName, Name )
import Name ( getOccString, getOccName, getSrcLoc, occNameString,
modAndOcc, OccName, Name )
import PrimOp ( PrimOp(..) )
import PrelInfo -- Lots of RdrNames
......@@ -53,7 +55,17 @@ import Type ( eqTy, isPrimType, SYN_IE(Type) )
import TysPrim ( charPrimTy, intPrimTy, wordPrimTy, addrPrimTy,
floatPrimTy, doublePrimTy
)
import Util ( mapAccumL, zipEqual, zipWith3Equal, nOfThem, panic, assertPanic )
import Util ( mapAccumL, zipEqual, zipWithEqual,
zipWith3Equal, nOfThem, panic, assertPanic )
#if defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ <= 200
intersperse :: a -> [a] -> [a]
intersperse s [] = []
intersperse s [x] = [x]
intersperse s (x:xs) = x : s : intersperse s xs
#endif
\end{code}
%************************************************************************
......@@ -587,8 +599,10 @@ gen_Ix_binds tycon
) tycon_loc))))
--------------------------------------------------------------
single_con_ixes = single_con_range `AndMonoBinds`
single_con_index `AndMonoBinds` single_con_inRange
single_con_ixes
= single_con_range `AndMonoBinds`
single_con_index `AndMonoBinds`
single_con_inRange
data_con
= case maybeTyConSingleCon tycon of -- just checking...
......@@ -598,15 +612,16 @@ gen_Ix_binds tycon
else
dc
con_arity = argFieldCount data_con
con_arity = argFieldCount data_con
data_con_RDR = qual_orig_name data_con
con_pat xs = ConPatIn data_con_RDR (map VarPatIn xs)
con_expr xs = mk_easy_App data_con_RDR xs
as_needed = take con_arity as_RDRs
bs_needed = take con_arity bs_RDRs
cs_needed = take con_arity cs_RDRs
con_pat xs = ConPatIn data_con_RDR (map VarPatIn xs)
con_expr = mk_easy_App data_con_RDR cs_needed
--------------------------------------------------------------
single_con_range
= mk_easy_FunMonoBind tycon_loc range_RDR [TuplePatIn [con_pat as_needed, con_pat bs_needed]] [] $
......@@ -614,7 +629,7 @@ gen_Ix_binds tycon
where
stmts = zipWith3Equal "single_con_range" mk_qual as_needed bs_needed cs_needed
++
[ReturnStmt (con_expr cs_needed)]
[ReturnStmt con_expr]
mk_qual a b c = BindStmt (VarPatIn c)
(HsApp (HsVar range_RDR) (ExplicitTuple [HsVar a, HsVar b]))
......@@ -625,6 +640,8 @@ gen_Ix_binds tycon
= mk_easy_FunMonoBind tycon_loc index_RDR [TuplePatIn [con_pat as_needed, con_pat bs_needed], con_pat cs_needed] [range_size] (
foldl mk_index (HsLit (HsInt 0)) (zip3 as_needed bs_needed cs_needed))
where
mk_index (HsLit (HsInt 0)) (l, u, i) -- optim.
= HsApp (HsApp (HsVar index_RDR) (ExplicitTuple [HsVar l, HsVar u])) (HsVar i)
mk_index multiply_by (l, u, i)
= genOpApp (
(HsApp (HsApp (HsVar index_RDR) (ExplicitTuple [HsVar l, HsVar u])) (HsVar i))
......@@ -683,33 +700,74 @@ gen_Read_binds tycon
data_con_RDR = qual_orig_name data_con
data_con_str= occNameString (getOccName data_con)
con_arity = argFieldCount data_con
as_needed = take con_arity as_RDRs
bs_needed = take con_arity bs_RDRs
con_expr = mk_easy_App data_con_RDR as_needed
nullary_con = con_arity == 0
labels = dataConFieldLabels data_con
lab_fields = length labels
as_needed = take con_arity as_RDRs
bs_needed
| lab_fields == 0 = take con_arity bs_RDRs
| otherwise = take (4*lab_fields + 1) bs_RDRs
-- (label, '=' and field)*n, (n-1)*',' + '{' + '}'
con_qual
= BindStmt
(TuplePatIn [LitPatIn (HsString data_con_str), d_Pat])
(HsApp (HsVar lex_RDR) c_Expr)
tycon_loc
field_quals = snd (mapAccumL mk_qual d_Expr (zipEqual "as_needed" as_needed bs_needed))
mk_qual draw_from (con_field, str_left)
= BindStmt
(TuplePatIn [LitPatIn (HsString data_con_str), d_Pat])
(HsApp (HsVar lex_RDR) c_Expr)
tycon_loc
str_qual str res draw_from
= BindStmt
(TuplePatIn [LitPatIn (HsString str), VarPatIn res])
(HsApp (HsVar lex_RDR) draw_from)
tycon_loc
read_label f
= let nm = occNameString (getOccName (fieldLabelName f))
in
[str_qual nm, str_qual SLIT("=")]
-- There might be spaces between the label and '='
field_quals
| lab_fields == 0 =
snd (mapAccumL mk_qual
d_Expr
(zipWithEqual "as_needed"
(\ con_field draw_from -> (mk_read_qual con_field,
draw_from))
as_needed bs_needed))
| otherwise =
snd $
mapAccumL mk_qual d_Expr
(zipEqual "bs_needed"
((str_qual (SLIT("{")):
concat (
intersperse ([str_qual SLIT(",")]) $
zipWithEqual
"field_quals"
(\ as b -> as ++ [b])
-- The labels
(map read_label labels)
-- The fields
(map mk_read_qual as_needed))) ++ [str_qual (SLIT("}"))])
bs_needed)
mk_qual draw_from (f, str_left)
= (HsVar str_left, -- what to draw from down the line...
BindStmt
(TuplePatIn [VarPatIn con_field, VarPatIn str_left])
(HsApp (HsApp (HsVar readsPrec_RDR) (HsLit (HsInt 10))) draw_from)
tycon_loc
)
f str_left draw_from)
mk_read_qual con_field res draw_from =
BindStmt
(TuplePatIn [VarPatIn con_field, VarPatIn res])
(HsApp (HsApp (HsVar readsPrec_RDR) (HsLit (HsInt 10))) draw_from)
tycon_loc
result_expr = ExplicitTuple [con_expr, if null bs_needed
then d_Expr
else HsVar (last bs_needed)]
stmts = (con_qual : field_quals) ++ [ReturnStmt result_expr]
stmts = con_qual:field_quals ++ [ReturnStmt result_expr]
read_paren_arg
= if nullary_con then -- must be False (parens are surely optional)
false_Expr
......@@ -721,6 +779,7 @@ gen_Read_binds tycon
HsLam (mk_easy_Match tycon_loc [c_Pat] [] $
HsDo ListComp stmts tycon_loc)
) (HsVar b_RDR)
\end{code}
%************************************************************************
......@@ -748,22 +807,57 @@ gen_Show_binds tycon
pats_etc data_con
= let
data_con_RDR = qual_orig_name data_con
con_arity = argFieldCount data_con
bs_needed = take con_arity bs_RDRs
con_pat = ConPatIn data_con_RDR (map VarPatIn bs_needed)
nullary_con = con_arity == 0
con_arity = argFieldCount data_con
bs_needed = take con_arity bs_RDRs
con_pat = ConPatIn data_con_RDR (map VarPatIn bs_needed)
nullary_con = con_arity == 0
labels = dataConFieldLabels data_con
lab_fields = length labels
show_con
= let nm = occNameString (getOccName data_con)
space_maybe = if nullary_con then _NIL_ else SLIT(" ")
space_ocurly_maybe
| nullary_con = _NIL_
| lab_fields == 0 = SLIT(" ")
| otherwise = SLIT("{")
in
HsApp (HsVar showString_RDR) (HsLit (HsString (nm _APPEND_ space_maybe)))
mk_showString_app (nm _APPEND_ space_ocurly_maybe)
show_thingies = show_con : (spacified real_show_thingies)
show_all con fs
= let
ccurly_maybe
| lab_fields > 0 = [mk_showString_app (SLIT("}"))]
| otherwise = []
in
con:fs ++ ccurly_maybe
show_thingies = show_all show_con real_show_thingies_with_labs
show_label l
= let nm = occNameString (getOccName (fieldLabelName l))
in
mk_showString_app (nm _APPEND_ SLIT("="))
mk_showString_app str = HsApp (HsVar showString_RDR)
(HsLit (HsString str))
real_show_thingies =
[ HsApp (HsApp (HsVar showsPrec_RDR) (HsLit (HsInt 10))) (HsVar b)
| b <- bs_needed ]
real_show_thingies_with_labs
| lab_fields == 0 = intersperse (HsVar showSpace_RDR) real_show_thingies
| otherwise = --Assumption: no of fields == no of labelled fields
-- (and in same order)
concat $
intersperse ([mk_showString_app (_CONS_ ',' _NIL_ )]) $ -- Using SLIT() is not cool here.
zipWithEqual "gen_Show_binds"
(\ a b -> [a,b])
(map show_label labels)
real_show_thingies
real_show_thingies
= [ HsApp (HsApp (HsVar showsPrec_RDR) (HsLit (HsInt 10))) (HsVar b)
| b <- bs_needed ]
in
if nullary_con then -- skip the showParen junk...
ASSERT(null bs_needed)
......@@ -772,10 +866,6 @@ gen_Show_binds tycon
([a_Pat, con_pat],
showParen_Expr (HsPar (genOpApp a_Expr ge_RDR (HsLit (HsInt 10))))
(HsPar (nested_compose_Expr show_thingies)))
where
spacified [] = []
spacified [x] = [x]
spacified (x:xs) = (x : (HsVar showSpace_RDR) : spacified xs)
\end{code}
%************************************************************************
......
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