git.iko.soy/rowtype-yoga/purescript-native
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rowtype-yoga/purescript-native/src/Language/PureScript/TypeClassDictionaries.hs
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1-----------------------------------------------------------------------------
2--
3-- Module : Language.PureScript.TypeClassDictionaries
4-- Copyright : (c) 2014 Phil Freeman
5-- License : MIT
6--
7-- Maintainer : Phil Freeman <paf31@cantab.net>
8-- Stability : experimental
9-- Portability :
10--
11-- |
12--
13-----------------------------------------------------------------------------
15{-# LANGUAGE DeriveDataTypeable #-}
17module Language.PureScript.TypeClassDictionaries where
19import Data.Data
21import Language.PureScript.Names
22import Language.PureScript.Types
24-- |
25-- Data representing a type class dictionary which is in scope
26--
27data TypeClassDictionaryInScope
28 = TypeClassDictionaryInScope {
29 -- | The identifier with which the dictionary can be accessed at runtime
30 tcdName :: Qualified Ident
31 -- | How to obtain this instance via superclass relationships
32 , tcdPath :: [(Qualified ProperName, Integer)]
33 -- | The name of the type class to which this type class instance applies
34 , tcdClassName :: Qualified ProperName
35 -- | The types to which this type class instance applies
36 , tcdInstanceTypes :: [Type]
37 -- | Type class dependencies which must be satisfied to construct this dictionary
38 , tcdDependencies :: Maybe [Constraint]
39 } deriving (Show, Read, Data, Typeable)
41-- |
42-- A simplified representation of expressions which are used to represent type
43-- class dictionaries at runtime, which can be compared for equality
44--
45data DictionaryValue
46 -- |
47 -- A dictionary which is brought into scope by a local constraint
48 --
49 = LocalDictionaryValue (Qualified Ident)
50 -- |
51 -- A dictionary which is brought into scope by an instance declaration
52 --
53 | GlobalDictionaryValue (Qualified Ident)
54 -- |
55 -- A dictionary which depends on other dictionaries
56 --
57 | DependentDictionaryValue (Qualified Ident) [DictionaryValue]
58 -- |
59 -- A subclass dictionary
60 --
61 | SubclassDictionaryValue DictionaryValue (Qualified ProperName) Integer
62 deriving (Show, Read, Ord, Eq)