%
+% (c) The University of Glasgow 2006
% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
-\section[HsExpr]{Abstract Haskell syntax: expressions}
+
+HsExpr: Abstract Haskell syntax: expressions
\begin{code}
module HsExpr where
#include "HsVersions.h"
-- friends:
-import HsDecls ( HsGroup )
-import HsPat ( LPat )
-import HsLit ( HsLit(..), HsOverLit )
-import HsTypes ( LHsType, PostTcType )
-import HsImpExp ( isOperator, pprHsVar )
-import HsBinds ( HsLocalBinds, DictBinds, ExprCoFn, isEmptyLocalBinds )
+import HsDecls
+import HsPat
+import HsLit
+import HsTypes
+import HsImpExp
+import HsBinds
-- others:
-import Type ( Type, pprParendType )
-import Var ( TyVar, Id )
-import Name ( Name )
-import BasicTypes ( IPName, Boxity, tupleParens, Arity, Fixity(..) )
-import SrcLoc ( Located(..), unLoc )
+import Var
+import Name
+import BasicTypes
+import SrcLoc
import Outputable
import FastString
\end{code}
-- always has an empty stack
---------------------------------------
+ -- Hpc Support
+
+ | HsTick
+ Int -- module-local tick number
+ (LHsExpr id) -- sub-expression
+
+ | HsBinTick
+ Int -- module-local tick number for True
+ Int -- module-local tick number for False
+ (LHsExpr id) -- sub-expression
+
+ ---------------------------------------
-- The following are commands, not expressions proper
| HsArrApp -- Arrow tail, or arrow application (f -< arg)
Everything from here on appears only in typechecker output.
\begin{code}
- | TyLam -- TRANSLATION
- [TyVar]
- (LHsExpr id)
- | TyApp -- TRANSLATION
- (LHsExpr id) -- generated by Spec
- [Type]
-
- -- DictLam and DictApp are "inverses"
- | DictLam
- [id]
- (LHsExpr id)
- | DictApp
- (LHsExpr id)
- [id]
-
- | HsCoerce ExprCoFn -- TRANSLATION
+ | HsWrap HsWrapper -- TRANSLATION
(HsExpr id)
type PendingSplice = (Name, LHsExpr Id) -- Typechecked splices, waiting to be
ppr_expr (HsSCC lbl expr)
= sep [ ptext SLIT("_scc_") <+> doubleQuotes (ftext lbl), pprParendExpr expr ]
-ppr_expr (TyLam tyvars expr)
- = hang (hsep [ptext SLIT("/\\"),
- hsep (map (pprBndr LambdaBind) tyvars),
- ptext SLIT("->")])
- 4 (ppr_lexpr expr)
-
-ppr_expr (TyApp expr [ty])
- = hang (ppr_lexpr expr) 4 (pprParendType ty)
-
-ppr_expr (TyApp expr tys)
- = hang (ppr_lexpr expr)
- 4 (brackets (interpp'SP tys))
-
-ppr_expr (DictLam dictvars expr)
- = hang (hsep [ptext SLIT("\\{-dict-}"),
- hsep (map (pprBndr LambdaBind) dictvars),
- ptext SLIT("->")])
- 4 (ppr_lexpr expr)
-
-ppr_expr (DictApp expr [dname])
- = hang (ppr_lexpr expr) 4 (ppr dname)
-
-ppr_expr (DictApp expr dnames)
- = hang (ppr_lexpr expr)
- 4 (brackets (interpp'SP dnames))
-
-ppr_expr (HsCoerce co_fn e) = ppr_expr e
-
-ppr_expr (HsType id) = ppr id
+ppr_expr (HsWrap co_fn e) = pprHsWrapper (ppr_expr e) co_fn
+ppr_expr (HsType id) = ppr id
ppr_expr (HsSpliceE s) = pprSplice s
ppr_expr (HsBracket b) = pprHsBracket b
ppr_expr (HsProc pat (L _ (HsCmdTop cmd _ _ _)))
= hsep [ptext SLIT("proc"), ppr pat, ptext SLIT("->"), ppr cmd]
+ppr_expr (HsTick tickId exp)
+ = hcat [ptext SLIT("tick<"), ppr tickId,ptext SLIT(">("), ppr exp,ptext SLIT(")")]
+ppr_expr (HsBinTick tickIdTrue tickIdFalse exp)
+ = hcat [ptext SLIT("bintick<"),
+ ppr tickIdTrue,
+ ptext SLIT(","),
+ ppr tickIdFalse,
+ ptext SLIT(">("),
+ ppr exp,ptext SLIT(")")]
+
ppr_expr (HsArrApp arrow arg _ HsFirstOrderApp True)
= hsep [ppr_lexpr arrow, ptext SLIT("-<"), ppr_lexpr arg]
ppr_expr (HsArrApp arrow arg _ HsFirstOrderApp False)
\begin{code}
pprMatches :: (OutputableBndr id) => HsMatchContext id -> MatchGroup id -> SDoc
-pprMatches ctxt (MatchGroup matches _) = vcat (map (pprMatch ctxt) (map unLoc matches))
+pprMatches ctxt (MatchGroup matches ty) = vcat (map (pprMatch ctxt) (map unLoc matches))
+ -- Don't print the type; it's only
+ -- a place-holder before typechecking
-- Exported to HsBinds, which can't see the defn of HsMatchContext
pprFunBind :: (OutputableBndr id) => id -> MatchGroup id -> SDoc