공통 타이프들 조금 정의

src/Gyehoek/Language/Common.hs

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+{-# LANGUAGE DeriveAnyClass #-}
+module Gyehoek.Language.Common
+  (
+  -- * Syntax
+    Lib(..)
+  , LibName(..)
+  , Exports
+  , Imports
+  , ExternName(..)
+  , Name(..)
+  ) where
+
+import Gyehoek.Prelude
+import Data.String (IsString)
+import Gyehoek.GenSym (Gen)
+import qualified Gyehoek.Sexp as S
+
+
+-- | R⁷RS 라이프러리의 표현.
+data Lib name body = MkLib
+  { name :: LibName
+  , exports :: Exports name
+  , imports :: Imports name
+  }
+  deriving (Show)
+
+newtype LibName = MkLibName { getLibName :: NonEmpty Text }
+  deriving stock (Show, Generic, Data, Eq)
+  deriving anyclass (NFData, Hashable)
+
+-- | A map whose keys are names of library definitions and whose
+-- values are the names they are exported as. An @⟨identifier⟩@ @x@
+-- corresponds to an entry @(⟨identifier⟩, ⟨identifier⟩)@, while a
+-- @(rename ⟨identifier₁⟩ ⟨identifier₂⟩)@ form corresponds to an entry
+-- @(⟨identifier₁⟩, ⟨identifier₂⟩)@.
+type Exports name = HashMap name ExternName
+
+-- | A map whose keys are symbols to be brought into the library's
+-- environment and whose values are pairs of the library in which the
+-- symbol is defined and the name the symbol is exported as.
+type Imports name = HashMap name (LibName, ExternName)
+
+-- | Representation of an identifier at the library boundary. While
+-- 'Name's are used within a compilation unit and may be decorated
+-- with additional structure and metadata, they are exported as
+-- 'ExternName's, which are essentially just plain strings.
+newtype ExternName = MkExternName { getExternName :: Text }
+  deriving newtype (Show)
+
+newtype Name = MkName { inner :: Text }
+  deriving newtype (Show, Eq, Ord, IsString, Gen, Hashable)
+  deriving stock (Generic, Data)
+  deriving anyclass (Wrapped, NFData)
+
+instance Prefixed Name where
+  prefixed (MkName s) = _Wrapped' . prefixed @Text s . from _Wrapped'
+
+
+--- DatumIsos
+
+instance S.DatumIso Name where
+  datumIso = S.decorate S.SynVariable
+    >>> S.symbol
+    >>> S.iso coerce coerce