[project @ 1997-05-26 04:57:23 by sof]

New interface containing defns that do not have a natural home

ghc/compiler/basicTypes/BasicTypes.lhs

+%
+% (c) The GRASP/AQUA Project, Glasgow University, 1997
+%
+\section[BasicTypes]{Miscellanous types}
+
+This module defines a miscellaneously collection of very simple
+types that
+
+\begin{itemize}
+\item have no other obvious home
+\item don't depend on any other complicated types
+\item are used in more than one "part" of the compiler
+\end{itemize}
+
+\begin{code}
+#include "HsVersions.h"
+
+module BasicTypes(
+	SYN_IE(Version), SYN_IE(Arity),
+	SYN_IE(Module), moduleString, pprModule,
+	Fixity(..), FixityDirection(..),
+	NewOrData(..)
+   ) where
+
+IMP_Ubiq()
+
+import Pretty
+import Outputable
+
+\end{code}
+
+%************************************************************************
+%*									*
+\subsection[Arity]{Arity}
+%*									*
+%************************************************************************
+
+\begin{code}
+type Arity = Int
+\end{code}
+
+
+%************************************************************************
+%*									*
+\subsection[Version]{Module and identifier version numbers}
+%*									*
+%************************************************************************
+
+\begin{code}
+type Version = Int
+\end{code}
+
+
+%************************************************************************
+%*									*
+\subsection[Module]{The name of a module}
+%*									*
+%************************************************************************
+
+\begin{code}
+type Module   = FAST_STRING
+
+moduleString :: Module -> String
+moduleString mod = _UNPK_ mod
+
+pprModule :: PprStyle -> Module -> Doc
+pprModule sty m = ptext m
+\end{code}
+
+
+%************************************************************************
+%*									*
+\subsection[Fixity]{Fixity info}
+%*									*
+%************************************************************************
+
+\begin{code}
+data Fixity = Fixity Int FixityDirection
+data FixityDirection = InfixL | InfixR | InfixN 
+		     deriving(Eq)
+
+instance Outputable Fixity where
+    ppr sty (Fixity prec dir) = hcat [ppr sty dir, space, int prec]
+
+instance Outputable FixityDirection where
+    ppr sty InfixL = ptext SLIT("infixl")
+    ppr sty InfixR = ptext SLIT("infixr")
+    ppr sty InfixN = ptext SLIT("infix")
+
+instance Eq Fixity where		-- Used to determine if two fixities conflict
+  (Fixity p1 dir1) == (Fixity p2 dir2) = p1==p2 && dir1 == dir2
+\end{code}
+
+
+%************************************************************************
+%*									*
+\subsection[NewType/DataType]{NewType/DataType flag}
+%*									*
+%************************************************************************
+
+\begin{code}
+data NewOrData
+  = NewType	    -- "newtype Blah ..."
+  | DataType	    -- "data Blah ..."
+  deriving( Eq )
+\end{code}