1 {-# LANGUAGE DefaultSignatures #-}
2 {-# LANGUAGE FlexibleContexts #-}
3 {-# LANGUAGE FlexibleInstances #-}
5 {-# LANGUAGE MultiParamTypeClasses #-}
6 {-# LANGUAGE OverloadedStrings #-}
7 {-# LANGUAGE Rank2Types #-}
8 {-# LANGUAGE ScopedTypeVariables #-}
9 {-# LANGUAGE TypeFamilies #-}
10 {-# LANGUAGE UndecidableInstances #-}
11 -- | Expression for 'Bool's.
12 module Language.LOL.Symantic.Expr.Bool where
14 import Data.Proxy (Proxy(..))
15 import Prelude hiding (and, not, or)
17 import Language.LOL.Symantic.AST
18 import Language.LOL.Symantic.Type
19 import Language.LOL.Symantic.Expr.Common
20 import Language.LOL.Symantic.Expr.Lambda
21 import Language.LOL.Symantic.Repr.Dup
22 import Language.LOL.Symantic.Trans.Common
27 class Sym_Bool repr where
28 bool :: Bool -> repr Bool
29 not :: repr Bool -> repr Bool
30 and :: repr Bool -> repr Bool -> repr Bool
31 or :: repr Bool -> repr Bool -> repr Bool
32 xor :: repr Bool -> repr Bool -> repr Bool
33 xor x y = (x `or` y) `and` not (x `and` y)
35 default bool :: Trans t repr => Bool -> t repr Bool
36 default not :: Trans t repr => t repr Bool -> t repr Bool
37 default and :: Trans t repr => t repr Bool -> t repr Bool -> t repr Bool
38 default or :: Trans t repr => t repr Bool -> t repr Bool -> t repr Bool
39 bool = trans_lift . bool
44 instance -- Sym_Bool Dup
47 ) => Sym_Bool (Dup r1 r2) where
48 bool x = bool x `Dup` bool x
49 not (x1 `Dup` x2) = not x1 `Dup` not x2
50 and (x1 `Dup` x2) (y1 `Dup` y2) = and x1 y1 `Dup` and x2 y2
51 or (x1 `Dup` x2) (y1 `Dup` y2) = or x1 y1 `Dup` or x2 y2
52 xor (x1 `Dup` x2) (y1 `Dup` y2) = xor x1 y1 `Dup` xor x2 y2
56 data Expr_Bool (root:: *)
57 type instance Root_of_Expr (Expr_Bool root) = root
58 type instance Type_of_Expr (Expr_Bool root) = Type_Bool
59 type instance Sym_of_Expr (Expr_Bool root) repr = Sym_Bool repr
60 type instance Error_of_Expr ast (Expr_Bool root) = Error_Expr_Bool ast
62 instance -- Expr_from AST Expr_Bool
63 ( Type_from AST (Type_Root_of_Expr root)
66 , Type_Root_Lift Type_Bool (Type_Root_of_Expr root)
67 , Error_Type_Lift (Error_Type_Fun AST)
68 (Error_of_Type AST (Type_Root_of_Expr root))
69 , Error_Expr_Lift (Error_Expr (Error_of_Type AST (Type_Root_of_Expr root))
70 ( Type_Root_of_Expr root)
72 (Error_of_Expr AST root)
74 , Type_Unlift Type_Bool (Type_of_Expr root)
76 , Root_of_Expr root ~ root
78 , Implicit_HBool (Is_Last_Expr (Expr_Bool root) root)
79 ) => Expr_from AST (Expr_Bool root) where
80 expr_from _px_ex ctx ast k =
85 case read_safe ast_bool of
86 Left err -> Left $ error_expr $ Error_Expr_Read err ast
88 k type_bool $ Forall_Repr_with_Context $
90 _ -> Left $ error_expr $
91 Error_Expr_Fun_Wrong_number_of_arguments 3 ast
92 AST "not" asts -> unary_from asts not
93 AST "and" asts -> binary_from asts and
94 AST "or" asts -> binary_from asts or
95 AST "xor" asts -> binary_from asts xor
97 case hbool :: HBool (Is_Last_Expr (Expr_Bool root) root) of
98 HTrue -> error_expr $ Error_Expr_Unsupported ast
99 HFalse -> error_expr $ Error_Expr_Unsupported_here ast
102 (op::forall repr. Sym_Bool repr
103 => repr Bool -> repr Bool) =
106 expr_from (Proxy::Proxy root) ctx ast_x $
107 \(ty_x::Type_Root_of_Expr root h_x) (Forall_Repr_with_Context x) ->
108 case type_unlift $ unType_Root ty_x of
109 Just (Type_Bool::Type_Bool (Type_Root_of_Expr root) h_x) ->
110 k ty_x $ Forall_Repr_with_Context (op . x)
111 _ -> Left $ error_expr $
112 Error_Expr_Fun_Argument_mismatch
113 (Exists_Type type_bool)
114 (Exists_Type ty_x) ast
115 _ -> Left $ error_expr $
116 Error_Expr_Fun_Wrong_number_of_arguments 1 ast
118 (op::forall repr. Sym_Bool repr
119 => repr Bool -> repr Bool -> repr Bool) =
122 expr_from (Proxy::Proxy root) ctx ast_x $
123 \(ty_x::Type_Root_of_Expr root h_x) (Forall_Repr_with_Context x) ->
124 expr_from (Proxy::Proxy root) ctx ast_y $
125 \(ty_y::Type_Root_of_Expr root h_y) (Forall_Repr_with_Context y) ->
126 case type_unlift $ unType_Root ty_x of
127 Just (Type_Bool::Type_Bool (Type_Root_of_Expr root) h_x) ->
128 case type_unlift $ unType_Root ty_y of
129 Just (Type_Bool::Type_Bool (Type_Root_of_Expr root) h_y) ->
130 k ty_x $ Forall_Repr_with_Context $
132 Nothing -> Left $ error_expr $
133 Error_Expr_Fun_Argument_mismatch
134 (Exists_Type type_bool)
135 (Exists_Type ty_y) ast
136 Nothing -> Left $ error_expr $
137 Error_Expr_Fun_Argument_mismatch
138 (Exists_Type type_bool)
139 (Exists_Type ty_x) ast
140 _ -> Left $ error_expr $
141 Error_Expr_Fun_Wrong_number_of_arguments 2 ast
143 :: Error_Expr (Error_of_Type AST (Type_Root_of_Expr root)) (Type_Root_of_Expr root) AST
144 -> Error_of_Expr AST root
145 error_expr = error_expr_lift
147 -- ** Type 'Expr_Lambda_Bool'
148 -- | Convenient alias.
149 type Expr_Lambda_Bool lam = Expr_Root (Expr_Alt (Expr_Lambda lam) Expr_Bool)
151 expr_lambda_bool_from
153 Expr_from ast (Expr_Lambda_Bool lam)
156 -> Either (Error_of_Expr ast (Expr_Lambda_Bool lam))
157 (Exists_Type_and_Repr (Type_Root_of_Expr (Expr_Lambda_Bool lam))
158 (Forall_Repr (Expr_Lambda_Bool lam)))
159 expr_lambda_bool_from _px_lam ast =
161 (Proxy::Proxy (Expr_Lambda_Bool lam))
162 Context_Empty ast $ \ty (Forall_Repr_with_Context repr) ->
163 Right $ Exists_Type_and_Repr ty $
164 Forall_Repr $ repr Context_Empty
166 -- * Type 'Error_Expr_Bool'
167 data Error_Expr_Bool ast