1 {-# LANGUAGE UndecidableInstances #-}
2 {-# OPTIONS_GHC -fno-warn-orphans #-}
3 -- | Symantic for 'Functor'.
4 module Language.Symantic.Lib.Functor where
6 import Control.Monad (liftM2)
7 import qualified Data.Function as Fun
8 import Data.Functor (Functor)
9 import qualified Data.Functor as Functor
10 import Data.Proxy (Proxy(..))
11 import Data.Type.Equality
12 import Prelude hiding (Functor(..))
14 import Language.Symantic.Parsing
15 import Language.Symantic.Typing
16 import Language.Symantic.Compiling
17 import Language.Symantic.Interpreting
18 import Language.Symantic.Transforming
19 import Language.Symantic.Lib.Lambda
21 -- * Class 'Sym_Functor'
22 class Sym_Lambda term => Sym_Functor term where
23 fmap :: Functor f => term (a -> b) -> term (f a) -> term (f b)
25 :: (Trans t term, Functor f)
29 fmap = trans_map2 fmap
31 (<$) :: Functor f => term a -> term (f b) -> term (f a)
32 (<$) a = fmap (lam (Fun.const a))
36 type instance Sym_of_Iface (Proxy Functor) = Sym_Functor
37 type instance Consts_of_Iface (Proxy Functor) = Proxy Functor ': Consts_imported_by Functor
38 type instance Consts_imported_by Functor = '[]
40 instance Sym_Functor HostI where
41 fmap = liftM2 Functor.fmap
42 (<$) = liftM2 (Functor.<$)
43 instance Sym_Functor TextI where
45 (<$) = textI_infix "<$" (infixL 4)
46 instance (Sym_Functor r1, Sym_Functor r2) => Sym_Functor (DupI r1 r2) where
47 fmap = dupI2 (Proxy @Sym_Functor) fmap
48 (<$) = dupI2 (Proxy @Sym_Functor) (<$)
51 (<$>) :: (Sym_Functor term, Functor f)
52 => term (a -> b) -> term (f a) -> term (f b)
57 ( Read_TypeNameR Type_Name cs rs
58 , Inj_Const cs Functor
59 ) => Read_TypeNameR Type_Name cs (Proxy Functor ': rs) where
60 read_typenameR _cs (Type_Name "Functor") k = k (ty @Functor)
61 read_typenameR _rs raw k = read_typenameR (Proxy @rs) raw k
62 instance Show_Const cs => Show_Const (Proxy Functor ': cs) where
63 show_const ConstZ{} = "Functor"
64 show_const (ConstS c) = show_const c
66 instance Proj_ConC cs (Proxy Functor)
67 data instance TokenT meta (ts::[*]) (Proxy Functor)
68 = Token_Term_Functor_fmap (EToken meta ts) (EToken meta ts)
69 | Token_Term_Functor_const (EToken meta ts) (EToken meta ts)
70 deriving instance Eq_Token meta ts => Eq (TokenT meta ts (Proxy Functor))
71 deriving instance Show_Token meta ts => Show (TokenT meta ts (Proxy Functor))
73 ( Inj_Const (Consts_of_Ifaces is) Functor
74 , Inj_Const (Consts_of_Ifaces is) (->)
75 , Proj_Con (Consts_of_Ifaces is)
77 ) => CompileI is (Proxy Functor) where
80 Token_Term_Functor_fmap tok_a2b tok_fa ->
81 -- fmap :: Functor f => (a -> b) -> f a -> f b
82 compileO tok_a2b ctx $ \ty_a2b (TermO a2b) ->
83 compileO tok_fa ctx $ \ty_fa (TermO fa) ->
84 check_type2 (ty @(->))
85 (At (Just tok_a2b) ty_a2b) $ \Refl ty_a2b_a ty_a2b_b ->
86 check_con1 (ty @Functor)
87 (At (Just tok_fa) ty_fa) $ \Refl Con ty_fa_f ty_fa_a ->
89 (At (Just tok_a2b) ty_a2b_a)
90 (At (Just tok_fa) ty_fa_a) $ \Refl ->
91 k (ty_fa_f :$ ty_a2b_b) $ TermO $
92 \c -> fmap (a2b c) (fa c)
93 Token_Term_Functor_const tok_a tok_fb ->
94 -- (<$) :: Functor f => a -> f b -> f a
95 compileO tok_a ctx $ \ty_a (TermO a) ->
96 compileO tok_fb ctx $ \ty_fb (TermO fb) ->
97 check_con1 (ty @Functor)
98 (At (Just tok_fb) ty_fb) $ \Refl Con ty_fb_f _ty_fb_b ->
99 k (ty_fb_f :$ ty_a) $ TermO $
100 \c -> (<$) (a c) (fb c)
101 instance -- TokenizeT
102 Inj_Token meta ts Functor =>
103 TokenizeT meta ts (Proxy Functor) where
104 tokenizeT _t = mempty
105 { tokenizers_infix = tokenizeTMod []
106 [ tokenize2 "fmap" infixN5 Token_Term_Functor_fmap
107 , tokenize2 "<$" (infixL 4) Token_Term_Functor_const
108 , tokenize2 "<$>" (infixL 4) Token_Term_Functor_fmap
111 instance Gram_Term_AtomsT meta ts (Proxy Functor) g