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rowtype-yoga/purescript-native/src/Language/PureScript/Environment.hs
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1{-# LANGUAGE OverloadedStrings #-}
2{-# LANGUAGE TemplateHaskell #-}
4module Language.PureScript.Environment where
6import Data.Maybe (fromMaybe)
7import Data.Aeson.TH
8import qualified Data.Map as M
9import qualified Data.Text as T
10import qualified Data.Aeson as A
12import Language.PureScript.Crash
13import Language.PureScript.Kinds
14import Language.PureScript.Names
15import Language.PureScript.TypeClassDictionaries
16import Language.PureScript.Types
17import qualified Language.PureScript.Constants as C
19-- |
20-- The @Environment@ defines all values and types which are currently in scope:
21--
22data Environment = Environment {
23 -- |
24 -- Value names currently in scope
25 --
26 names :: M.Map (ModuleName, Ident) (Type, NameKind, NameVisibility)
27 -- |
28 -- Type names currently in scope
29 --
30 , types :: M.Map (Qualified (ProperName 'TypeName)) (Kind, TypeKind)
31 -- |
32 -- Data constructors currently in scope, along with their associated type
33 -- constructor name, argument types and return type.
34 , dataConstructors :: M.Map (Qualified (ProperName 'ConstructorName)) (DataDeclType, ProperName 'TypeName, Type, [Ident])
35 -- |
36 -- Type synonyms currently in scope
37 --
38 , typeSynonyms :: M.Map (Qualified (ProperName 'TypeName)) ([(String, Maybe Kind)], Type)
39 -- |
40 -- Available type class dictionaries
41 --
42 , typeClassDictionaries :: M.Map (Maybe ModuleName) (M.Map (Qualified (ProperName 'ClassName)) (M.Map (Qualified Ident) TypeClassDictionaryInScope))
43 -- |
44 -- Type classes
45 --
46 , typeClasses :: M.Map (Qualified (ProperName 'ClassName)) ([(String, Maybe Kind)], [(Ident, Type)], [Constraint])
47 } deriving (Show, Read)
49-- |
50-- The initial environment with no values and only the default javascript types defined
51--
52initEnvironment :: Environment
53initEnvironment = Environment M.empty primTypes M.empty M.empty M.empty primClasses
55-- |
56-- The visibility of a name in scope
57--
58data NameVisibility
59 -- |
60 -- The name is defined in the current binding group, but is not visible
61 --
62 = Undefined
63 -- |
64 -- The name is defined in the another binding group, or has been made visible by a function binder
65 --
66 | Defined deriving (Show, Read, Eq)
68-- |
69-- A flag for whether a name is for an private or public value - only public values will be
70-- included in a generated externs file.
71--
72data NameKind
73 -- |
74 -- A private value introduced as an artifact of code generation (class instances, class member
75 -- accessors, etc.)
76 --
77 = Private
78 -- |
79 -- A public value for a module member or foreing import declaration
80 --
81 | Public
82 -- |
83 -- A name for member introduced by foreign import
84 --
85 | External
86 deriving (Show, Read, Eq)
88-- |
89-- The kinds of a type
90--
91data TypeKind
92 -- |
93 -- Data type
94 --
95 = DataType [(String, Maybe Kind)] [(ProperName 'ConstructorName, [Type])]
96 -- |
97 -- Type synonym
98 --
99 | TypeSynonym
100 -- |
101 -- Foreign data
102 --
103 | ExternData
104 -- |
105 -- A local type variable
106 --
107 | LocalTypeVariable
108 -- |
109 -- A scoped type variable
110 --
111 | ScopedTypeVar
112 deriving (Show, Read, Eq)
114-- |
115-- The type ('data' or 'newtype') of a data type declaration
116--
117data DataDeclType
118 -- |
119 -- A standard data constructor
120 --
121 = Data
122 -- |
123 -- A newtype constructor
124 --
125 | Newtype
126 deriving (Show, Read, Eq, Ord)
128showDataDeclType :: DataDeclType -> String
129showDataDeclType Data = "data"
130showDataDeclType Newtype = "newtype"
132instance A.ToJSON DataDeclType where
133 toJSON = A.toJSON . showDataDeclType
135instance A.FromJSON DataDeclType where
136 parseJSON = A.withText "DataDeclType" $ \str ->
137 case str of
138 "data" -> return Data
139 "newtype" -> return Newtype
140 other -> fail $ "invalid type: '" ++ T.unpack other ++ "'"
142-- |
143-- Construct a ProperName in the Prim module
144--
145primName :: String -> Qualified (ProperName a)
146primName = Qualified (Just $ ModuleName [ProperName C.prim]) . ProperName
148-- |
149-- Construct a type in the Prim module
150--
151primTy :: String -> Type
152primTy = TypeConstructor . primName
154-- |
155-- Type constructor for functions
156--
157tyFunction :: Type
158tyFunction = primTy "Function"
160-- |
161-- Type constructor for strings
162--
163tyString :: Type
164tyString = primTy "String"
166-- |
167-- Type constructor for strings
168--
169tyChar :: Type
170tyChar = primTy "Char"
172-- |
173-- Type constructor for numbers
174--
175tyNumber :: Type
176tyNumber = primTy "Number"
178-- |
179-- Type constructor for integers
180--
181tyInt :: Type
182tyInt = primTy "Int"
184-- |
185-- Type constructor for booleans
186--
187tyBoolean :: Type
188tyBoolean = primTy "Boolean"
190-- |
191-- Type constructor for arrays
192--
193tyArray :: Type
194tyArray = primTy "Array"
196-- |
197-- Type constructor for objects
198--
199tyObject :: Type
200tyObject = primTy "Object"
202-- |
203-- Check whether a type is an object
204--
205isObject :: Type -> Bool
206isObject = isTypeOrApplied tyObject
208-- |
209-- Check whether a type is a function
210--
211isFunction :: Type -> Bool
212isFunction = isTypeOrApplied tyFunction
214isTypeOrApplied :: Type -> Type -> Bool
215isTypeOrApplied t1 (TypeApp t2 _) = t1 == t2
216isTypeOrApplied t1 t2 = t1 == t2
218-- |
219-- Smart constructor for function types
220--
221function :: Type -> Type -> Type
222function t1 = TypeApp (TypeApp tyFunction t1)
224-- |
225-- The primitive types in the external javascript environment with their
226-- associated kinds. There is also a pseudo `Partial` type that corresponds to
227-- the class with the same name.
228--
229primTypes :: M.Map (Qualified (ProperName 'TypeName)) (Kind, TypeKind)
230primTypes =
231 M.fromList
232 [ (primName "Function", (FunKind Star (FunKind Star Star), ExternData))
233 , (primName "Array", (FunKind Star Star, ExternData))
234 , (primName "Object", (FunKind (Row Star) Star, ExternData))
235 , (primName "String", (Star, ExternData))
236 , (primName "Char", (Star, ExternData))
237 , (primName "Number", (Star, ExternData))
238 , (primName "Int", (Star, ExternData))
239 , (primName "Boolean", (Star, ExternData))
240 , (primName "Partial", (Star, ExternData))
241 ]
243-- |
244-- The primitive class map. This just contains to `Partial` class, used as a
245-- kind of magic constraint for partial functions.
246--
247primClasses :: M.Map (Qualified (ProperName 'ClassName)) ([(String, Maybe Kind)], [(Ident, Type)], [Constraint])
248primClasses =
249 M.fromList
250 [ (primName "Partial", ([], [], [])) ]
252-- |
253-- Finds information about data constructors from the current environment.
254--
255lookupConstructor :: Environment -> Qualified (ProperName 'ConstructorName) -> (DataDeclType, ProperName 'TypeName, Type, [Ident])
256lookupConstructor env ctor =
257 fromMaybe (internalError "Data constructor not found") $ ctor `M.lookup` dataConstructors env
259-- |
260-- Checks whether a data constructor is for a newtype.
261--
262isNewtypeConstructor :: Environment -> Qualified (ProperName 'ConstructorName) -> Bool
263isNewtypeConstructor e ctor = case lookupConstructor e ctor of
264 (Newtype, _, _, _) -> True
265 (Data, _, _, _) -> False
267-- |
268-- Finds information about values from the current environment.
269--
270lookupValue :: Environment -> Qualified Ident -> Maybe (Type, NameKind, NameVisibility)
271lookupValue env (Qualified (Just mn) ident) = (mn, ident) `M.lookup` names env
272lookupValue _ _ = Nothing
274$(deriveJSON (defaultOptions { sumEncoding = ObjectWithSingleField }) ''TypeKind)