1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
|
----------------------------------------------------------------------
-- |
-- Module : AppPredefined
-- Maintainer : AR
-- Stability : (stable)
-- Portability : (portable)
--
-- > CVS $Date: 2005/10/06 14:21:34 $
-- > CVS $Author: aarne $
-- > CVS $Revision: 1.13 $
--
-- Predefined function type signatures and definitions.
-----------------------------------------------------------------------------
module GF.Compile.Compute.AppPredefined (
isInPredefined, typPredefined, arrityPredefined, predefModInfo, appPredefined
) where
import GF.Infra.Ident(identS)
import GF.Infra.Option
import GF.Data.Operations
import GF.Grammar
import GF.Grammar.Predef
import qualified Data.Map as Map
import Text.PrettyPrint
import Data.Char (isUpper,toUpper,toLower)
-- predefined function type signatures and definitions. AR 12/3/2003.
isInPredefined :: Ident -> Bool
isInPredefined f = Map.member f primitives
typPredefined :: Ident -> Maybe Type
typPredefined f = case Map.lookup f primitives of
Just (ResOper (Just (L _ ty)) _) -> Just ty
Just (ResParam _ _) -> Just typePType
Just (ResValue (L _ ty)) -> Just ty
_ -> Nothing
arrityPredefined :: Ident -> Maybe Int
arrityPredefined f = do ty <- typPredefined f
let (ctxt,_) = typeFormCnc ty
return (length ctxt)
predefModInfo :: SourceModInfo
predefModInfo = ModInfo MTResource MSComplete noOptions [] Nothing [] [] "Predef.gf" Nothing primitives
primitives = Map.fromList
[ (cErrorType, ResOper (Just (noLoc typeType)) Nothing)
, (cInt , ResOper (Just (noLoc typePType)) Nothing)
, (cFloat , ResOper (Just (noLoc typePType)) Nothing)
, (cInts , fun [typeInt] typePType)
, (cPBool , ResParam (Just (noLoc [(cPTrue,[]),(cPFalse,[])])) (Just [QC (cPredef,cPTrue), QC (cPredef,cPFalse)]))
, (cPTrue , ResValue (noLoc typePBool))
, (cPFalse , ResValue (noLoc typePBool))
, (cError , fun [typeStr] typeError) -- non-can. of empty set
, (cLength , fun [typeTok] typeInt)
, (cDrop , fun [typeInt,typeTok] typeTok)
, (cTake , fun [typeInt,typeTok] typeTok)
, (cTk , fun [typeInt,typeTok] typeTok)
, (cDp , fun [typeInt,typeTok] typeTok)
, (cEqInt , fun [typeInt,typeInt] typePBool)
, (cLessInt , fun [typeInt,typeInt] typePBool)
, (cPlus , fun [typeInt,typeInt] typeInt)
, (cEqStr , fun [typeTok,typeTok] typePBool)
, (cOccur , fun [typeTok,typeTok] typePBool)
, (cOccurs , fun [typeTok,typeTok] typePBool)
, (cToUpper , fun [typeTok] typeTok)
, (cToLower , fun [typeTok] typeTok)
, (cIsUpper , fun [typeTok] typePBool)
---- "read" ->
, (cRead , ResOper (Just (noLoc (mkProd -- (P : Type) -> Tok -> P
[(Explicit,varP,typePType),(Explicit,identW,typeStr)] (Vr varP) []))) Nothing)
, (cShow , ResOper (Just (noLoc (mkProd -- (P : PType) -> P -> Tok
[(Explicit,varP,typePType),(Explicit,identW,Vr varP)] typeStr []))) Nothing)
, (cEqVal , ResOper (Just (noLoc (mkProd -- (P : PType) -> P -> P -> PBool
[(Explicit,varP,typePType),(Explicit,identW,Vr varP),(Explicit,identW,Vr varP)] typePBool []))) Nothing)
, (cToStr , ResOper (Just (noLoc (mkProd -- (L : Type) -> L -> Str
[(Explicit,varL,typeType),(Explicit,identW,Vr varL)] typeStr []))) Nothing)
, (cMapStr , ResOper (Just (noLoc (mkProd -- (L : Type) -> (Str -> Str) -> L -> L
[(Explicit,varL,typeType),(Explicit,identW,mkFunType [typeStr] typeStr),(Explicit,identW,Vr varL)] (Vr varL) []))) Nothing)
, (cNonExist , ResOper (Just (noLoc (mkProd -- Str
[] typeStr []))) Nothing)
]
where
fun from to = oper (mkFunType from to)
oper ty = ResOper (Just (noLoc ty)) Nothing
varL = identS "L"
varP = identS "P"
appPredefined :: Term -> Err (Term,Bool)
appPredefined t = case t of
App f x0 -> do
(x,_) <- appPredefined x0
case f of
-- one-place functions
Q (mod,f) | mod == cPredef ->
case x of
(K s) | f == cLength -> retb $ EInt $ length s
(K s) | f == cIsUpper -> retb $ if (all isUpper s) then predefTrue else predefFalse
(K s) | f == cToUpper -> retb $ K $ map toUpper s
(K s) | f == cToLower -> retb $ K $ map toLower s
(K s) | f == cError -> retb $ Error s
_ -> retb t
-- two-place functions
App (Q (mod,f)) z0 | mod == cPredef -> do
(z,_) <- appPredefined z0
case (norm z, norm x) of
(EInt i, K s) | f == cDrop -> retb $ K (drop i s)
(EInt i, K s) | f == cTake -> retb $ K (take i s)
(EInt i, K s) | f == cTk -> retb $ K (take (max 0 (length s - i)) s)
(EInt i, K s) | f == cDp -> retb $ K (drop (max 0 (length s - i)) s)
(K s, K t) | f == cEqStr -> retb $ if s == t then predefTrue else predefFalse
(K s, K t) | f == cOccur -> retb $ if substring s t then predefTrue else predefFalse
(K s, K t) | f == cOccurs -> retb $ if any (flip elem t) s then predefTrue else predefFalse
(EInt i, EInt j) | f == cEqInt -> retb $ if i==j then predefTrue else predefFalse
(EInt i, EInt j) | f == cLessInt -> retb $ if i<j then predefTrue else predefFalse
(EInt i, EInt j) | f == cPlus -> retb $ EInt $ i+j
(_, t) | f == cShow && notVar t -> retb $ foldrC $ map K $ words $ render (ppTerm Unqualified 0 t)
(_, K s) | f == cRead -> retb $ Cn (identS s) --- because of K, only works for atomic tags
(_, t) | f == cToStr -> trm2str t >>= retb
_ -> retb t ---- prtBad "cannot compute predefined" t
-- three-place functions
App (App (Q (mod,f)) z0) y0 | mod == cPredef -> do
(y,_) <- appPredefined y0
(z,_) <- appPredefined z0
case (z, y, x) of
(ty,op,t) | f == cMapStr -> retf $ mapStr ty op t
_ | f == cEqVal && notVar y && notVar x -> retb $ if y==x then predefTrue else predefFalse
_ -> retb t ---- prtBad "cannot compute predefined" t
_ -> retb t ---- prtBad "cannot compute predefined" t
_ -> retb t
---- should really check the absence of arg variables
where
retb t = return (retc t,True) -- no further computing needed
retf t = return (retc t,False) -- must be computed further
retc t = case t of
K [] -> t
K s -> foldr1 C (map K (words s))
_ -> t
norm t = case t of
Empty -> K []
C u v -> case (norm u,norm v) of
(K x,K y) -> K (x +++ y)
_ -> t
_ -> t
notVar t = case t of
Vr _ -> False
App f a -> notVar f && notVar a
_ -> True ---- would need to check that t is a value
foldrC ts = if null ts then Empty else foldr1 C ts
-- read makes variables into constants
predefTrue = QC (cPredef,cPTrue)
predefFalse = QC (cPredef,cPFalse)
substring :: String -> String -> Bool
substring s t = case (s,t) of
(c:cs, d:ds) -> (c == d && substring cs ds) || substring s ds
([],_) -> True
_ -> False
trm2str :: Term -> Err Term
trm2str t = case t of
R ((_,(_,s)):_) -> trm2str s
T _ ((_,s):_) -> trm2str s
V _ (s:_) -> trm2str s
C _ _ -> return $ t
K _ -> return $ t
S c _ -> trm2str c
Empty -> return $ t
_ -> Bad (render (text "cannot get Str from term" <+> ppTerm Unqualified 0 t))
-- simultaneous recursion on type and term: type arg is essential!
-- But simplify the task by assuming records are type-annotated
-- (this has been done in type checking)
mapStr :: Type -> Term -> Term -> Term
mapStr ty f t = case (ty,t) of
_ | elem ty [typeStr,typeTok] -> App f t
(_, R ts) -> R [(l,mapField v) | (l,v) <- ts]
(Table a b,T ti cs) -> T ti [(p,mapStr b f v) | (p,v) <- cs]
_ -> t
where
mapField (mty,te) = case mty of
Just ty -> (mty,mapStr ty f te)
_ -> (mty,te)
|
