module HsExpr where
-import Ubiq{-uitous-}
-import HsLoop -- for paranoia checking
+IMP_Ubiq(){-uitous-}
-- friends:
+IMPORT_DELOOPER(HsLoop) ( pprMatches, pprMatch, Match )
import HsBinds ( HsBinds )
-import HsLit ( HsLit )
-import HsMatches ( pprMatches, pprMatch, Match )
-import HsTypes ( PolyType )
+import HsBasic ( HsLit )
+import BasicTypes ( Fixity(..), FixityDirection(..) )
+import HsTypes ( HsType )
-- others:
-import Id ( DictVar(..), GenId, Id(..) )
-import Name ( isOpLexeme, pprOp )
-import Outputable ( interppSP, interpp'SP, ifnotPprForUser )
+import Id ( SYN_IE(DictVar), GenId, SYN_IE(Id) )
+import Outputable ( pprQuote, interppSP, interpp'SP, ifnotPprForUser,
+ PprStyle(..), userStyle, Outputable(..) )
import PprType ( pprGenType, pprParendGenType, GenType{-instance-} )
import Pretty
-import PprStyle ( PprStyle(..) )
import SrcLoc ( SrcLoc )
import Usage ( GenUsage{-instance-} )
-import Util ( panic{-ToDo:rm eventually-} )
+--import Util ( panic{-ToDo:rm eventually-} )
+#if __GLASGOW_HASKELL__ >= 202
+import Name
+#endif
\end{code}
%************************************************************************
| OpApp (HsExpr tyvar uvar id pat) -- left operand
(HsExpr tyvar uvar id pat) -- operator
+ Fixity -- Renamer adds fixity; bottom until then
(HsExpr tyvar uvar id pat) -- right operand
-- We preserve prefix negation and parenthesis for the precedence parser.
+ -- They are eventually removed by the type checker.
| NegApp (HsExpr tyvar uvar id pat) -- negated expr
+ (HsExpr tyvar uvar id pat) -- the negate id (in a HsVar)
+
| HsPar (HsExpr tyvar uvar id pat) -- parenthesised expr
| SectionL (HsExpr tyvar uvar id pat) -- operand
| SectionR (HsExpr tyvar uvar id pat) -- operator
(HsExpr tyvar uvar id pat) -- operand
-
| HsCase (HsExpr tyvar uvar id pat)
[Match tyvar uvar id pat] -- must have at least one Match
SrcLoc
| HsLet (HsBinds tyvar uvar id pat) -- let(rec)
(HsExpr tyvar uvar id pat)
- | HsDo [Stmt tyvar uvar id pat] -- "do":one or more stmts
+ | HsDo DoOrListComp
+ [Stmt tyvar uvar id pat] -- "do":one or more stmts
SrcLoc
- | HsDoOut [Stmt tyvar uvar id pat] -- "do":one or more stmts
- id id -- Monad and MonadZero dicts
+ | HsDoOut DoOrListComp
+ [Stmt tyvar uvar id pat] -- "do":one or more stmts
+ id -- id for return
+ id -- id for >>=
+ id -- id for zero
+ (GenType tyvar uvar) -- Type of the whole expression
SrcLoc
- | ListComp (HsExpr tyvar uvar id pat) -- list comprehension
- [Qual tyvar uvar id pat] -- at least one Qual(ifier)
-
| ExplicitList -- syntactic list
[HsExpr tyvar uvar id pat]
| ExplicitListOut -- TRANSLATION
| RecordUpd (HsExpr tyvar uvar id pat)
(HsRecordBinds tyvar uvar id pat)
- | RecordUpdOut (HsExpr tyvar uvar id pat) -- TRANSLATION
- [id] -- Dicts needed for construction
- (HsRecordBinds tyvar uvar id pat)
+ | RecordUpdOut (HsExpr tyvar uvar id pat) -- TRANSLATION
+ (GenType tyvar uvar) -- Type of *result* record (may differ from
+ -- type of input record)
+ [id] -- Dicts needed for construction
+ (HsRecordBinds tyvar uvar id pat)
| ExprWithTySig -- signature binding
(HsExpr tyvar uvar id pat)
- (PolyType id)
+ (HsType id)
| ArithSeqIn -- arithmetic sequence
(ArithSeqInfo tyvar uvar id pat)
| ArithSeqOut
| SingleDict -- a simple special case of Dictionary
id -- local dictionary name
- | HsCon -- TRANSLATION; a constructor application
- Id -- used only in the RHS of constructor definitions
- [GenType tyvar uvar]
- [HsExpr tyvar uvar id pat]
-
type HsRecordBinds tyvar uvar id pat
= [(id, HsExpr tyvar uvar id pat, Bool)]
-- True <=> source code used "punning",
instance (NamedThing id, Outputable id, Outputable pat,
Eq tyvar, Outputable tyvar, Eq uvar, Outputable uvar) =>
Outputable (HsExpr tyvar uvar id pat) where
- ppr = pprExpr
+ ppr sty expr = pprQuote sty $ \ sty -> pprExpr sty expr
\end{code}
\begin{code}
-pprExpr sty (HsVar v)
- = (if (isOpLexeme v) then ppParens else id) (ppr sty v)
+pprExpr :: (NamedThing id, Outputable id, Outputable pat,
+ Eq tyvar, Outputable tyvar, Eq uvar, Outputable uvar)
+ => PprStyle -> HsExpr tyvar uvar id pat -> Doc
+
+pprExpr sty (HsVar v) = ppr sty v
pprExpr sty (HsLit lit) = ppr sty lit
pprExpr sty (HsLitOut lit _) = ppr sty lit
pprExpr sty (HsLam match)
- = ppCat [ppStr "\\", ppNest 2 (pprMatch sty True match)]
+ = hsep [char '\\', nest 2 (pprMatch sty True match)]
pprExpr sty expr@(HsApp e1 e2)
= let (fun, args) = collect_args expr [] in
- ppHang (pprParendExpr sty fun) 4 (ppSep (map (pprParendExpr sty) args))
+ (pprExpr sty fun) <+> (sep (map (pprExpr sty) args))
where
collect_args (HsApp fun arg) args = collect_args fun (arg:args)
collect_args fun args = (fun, args)
-
-pprExpr sty (OpApp e1 op e2)
+pprExpr sty (OpApp e1 op fixity e2)
= case op of
HsVar v -> pp_infixly v
_ -> pp_prefixly
where
- pp_e1 = pprParendExpr sty e1
+ pp_e1 = pprParendExpr sty e1 -- Add parens to make precedence clear
pp_e2 = pprParendExpr sty e2
pp_prefixly
- = ppHang (pprParendExpr sty op) 4 (ppSep [pp_e1, pp_e2])
+ = hang (pprExpr sty op) 4 (sep [pp_e1, pp_e2])
pp_infixly v
- = ppSep [pp_e1, ppCat [pprOp sty v, pp_e2]]
+ = sep [pp_e1, hsep [ppr sty v, pp_e2]]
-pprExpr sty (NegApp e)
- = ppBeside (ppChar '-') (ppParens (pprExpr sty e))
+pprExpr sty (NegApp e _)
+ = (<>) (char '-') (pprParendExpr sty e)
pprExpr sty (HsPar e)
- = ppParens (pprExpr sty e)
-
+ = parens (pprExpr sty e)
pprExpr sty (SectionL expr op)
= case op of
where
pp_expr = pprParendExpr sty expr
- pp_prefixly = ppHang (ppCat [ppStr "( \\ _x ->", ppr sty op])
- 4 (ppCat [pp_expr, ppStr "_x )"])
- pp_infixly v
- = ppSep [ ppBeside ppLparen pp_expr,
- ppBeside (pprOp sty v) ppRparen ]
+ pp_prefixly = hang (hsep [text " \\ x_ ->", ppr sty op])
+ 4 (hsep [pp_expr, ptext SLIT("x_ )")])
+ pp_infixly v = parens (sep [pp_expr, ppr sty v])
pprExpr sty (SectionR op expr)
= case op of
where
pp_expr = pprParendExpr sty expr
- pp_prefixly = ppHang (ppCat [ppStr "( \\ _x ->", ppr sty op, ppPStr SLIT("_x")])
- 4 (ppBeside pp_expr ppRparen)
+ pp_prefixly = hang (hsep [text "( \\ x_ ->", ppr sty op, ptext SLIT("x_")])
+ 4 ((<>) pp_expr rparen)
pp_infixly v
- = ppSep [ ppBeside ppLparen (pprOp sty v),
- ppBeside pp_expr ppRparen ]
-
-pprExpr sty (CCall fun args _ is_asm result_ty)
- = ppHang (if is_asm
- then ppBesides [ppStr "_casm_ ``", ppPStr fun, ppStr "''"]
- else ppBeside (ppPStr SLIT("_ccall_ ")) (ppPStr fun))
- 4 (ppSep (map (pprParendExpr sty) args))
-
-pprExpr sty (HsSCC label expr)
- = ppSep [ ppBeside (ppPStr SLIT("_scc_ ")) (ppBesides [ppChar '"', ppPStr label, ppChar '"']),
- pprParendExpr sty expr ]
+ = parens (sep [ppr sty v, pp_expr])
pprExpr sty (HsCase expr matches _)
- = ppSep [ ppSep [ppPStr SLIT("case"), ppNest 4 (pprExpr sty expr), ppPStr SLIT("of")],
- ppNest 2 (pprMatches sty (True, ppNil) matches) ]
+ = sep [ sep [ptext SLIT("case"), nest 4 (pprExpr sty expr), ptext SLIT("of")],
+ nest 2 (pprMatches sty (True, empty) matches) ]
-pprExpr sty (ListComp expr quals)
- = ppHang (ppCat [ppLbrack, pprExpr sty expr, ppChar '|'])
- 4 (ppSep [interpp'SP sty quals, ppRbrack])
+pprExpr sty (HsIf e1 e2 e3 _)
+ = sep [hsep [ptext SLIT("if"), nest 2 (pprExpr sty e1), ptext SLIT("then")],
+ nest 4 (pprExpr sty e2),
+ ptext SLIT("else"),
+ nest 4 (pprExpr sty e3)]
-- special case: let ... in let ...
pprExpr sty (HsLet binds expr@(HsLet _ _))
- = ppSep [ppHang (ppPStr SLIT("let")) 2 (ppCat [ppr sty binds, ppPStr SLIT("in")]),
+ = sep [hang (ptext SLIT("let")) 2 (hsep [ppr sty binds, ptext SLIT("in")]),
ppr sty expr]
pprExpr sty (HsLet binds expr)
- = ppSep [ppHang (ppPStr SLIT("let")) 2 (ppr sty binds),
- ppHang (ppPStr SLIT("in")) 2 (ppr sty expr)]
-
-pprExpr sty (HsDo stmts _)
- = ppCat [ppPStr SLIT("do"), ppAboves (map (ppr sty) stmts)]
+ = sep [hang (ptext SLIT("let")) 2 (ppr sty binds),
+ hang (ptext SLIT("in")) 2 (ppr sty expr)]
-pprExpr sty (HsIf e1 e2 e3 _)
- = ppSep [ppCat [ppPStr SLIT("if"), ppNest 2 (pprExpr sty e1), ppPStr SLIT("then")],
- ppNest 4 (pprExpr sty e2),
- ppPStr SLIT("else"),
- ppNest 4 (pprExpr sty e3)]
+pprExpr sty (HsDo do_or_list_comp stmts _) = pprDo do_or_list_comp sty stmts
+pprExpr sty (HsDoOut do_or_list_comp stmts _ _ _ _ _) = pprDo do_or_list_comp sty stmts
pprExpr sty (ExplicitList exprs)
- = ppBracket (ppInterleave ppComma (map (pprExpr sty) exprs))
+ = brackets (fsep (punctuate comma (map (pprExpr sty) exprs)))
pprExpr sty (ExplicitListOut ty exprs)
- = ppBesides [ ppBracket (ppInterleave ppComma (map (pprExpr sty) exprs)),
- ifnotPprForUser sty (ppBeside ppSP (ppParens (pprGenType sty ty))) ]
+ = hcat [ brackets (fsep (punctuate comma (map (pprExpr sty) exprs))),
+ ifnotPprForUser sty ((<>) space (parens (pprGenType sty ty))) ]
pprExpr sty (ExplicitTuple exprs)
- = ppParens (ppInterleave ppComma (map (pprExpr sty) exprs))
-pprExpr sty (ExprWithTySig expr sig)
- = ppHang (ppBesides [ppLparen, ppNest 2 (pprExpr sty expr), ppPStr SLIT(" ::")])
- 4 (ppBeside (ppr sty sig) ppRparen)
+ = parens (sep (punctuate comma (map (pprExpr sty) exprs)))
pprExpr sty (RecordCon con rbinds)
= pp_rbinds sty (ppr sty con) rbinds
pprExpr sty (RecordUpd aexp rbinds)
= pp_rbinds sty (pprParendExpr sty aexp) rbinds
+pprExpr sty (RecordUpdOut aexp _ _ rbinds)
+ = pp_rbinds sty (pprParendExpr sty aexp) rbinds
+
+pprExpr sty (ExprWithTySig expr sig)
+ = hang ((<>) (nest 2 (pprExpr sty expr)) (ptext SLIT(" ::")))
+ 4 (ppr sty sig)
pprExpr sty (ArithSeqIn info)
- = ppBracket (ppr sty info)
+ = brackets (ppr sty info)
pprExpr sty (ArithSeqOut expr info)
- = case sty of
- PprForUser ->
- ppBracket (ppr sty info)
- _ ->
- ppBesides [ppLbrack, ppParens (ppr sty expr), ppr sty info, ppRbrack]
+ | userStyle sty = brackets (ppr sty info)
+ | otherwise = brackets (hcat [parens (ppr sty expr), space, ppr sty info])
+
+pprExpr sty (CCall fun args _ is_asm result_ty)
+ = hang (if is_asm
+ then hcat [ptext SLIT("_casm_ ``"), ptext fun, ptext SLIT("''")]
+ else (<>) (ptext SLIT("_ccall_ ")) (ptext fun))
+ 4 (sep (map (pprParendExpr sty) args))
+
+pprExpr sty (HsSCC label expr)
+ = sep [ (<>) (ptext SLIT("_scc_ ")) (hcat [char '"', ptext label, char '"']),
+ pprParendExpr sty expr ]
pprExpr sty (TyLam tyvars expr)
- = ppHang (ppCat [ppStr "/\\", interppSP sty tyvars, ppStr "->"])
+ = hang (hsep [ptext SLIT("/\\"), interppSP sty tyvars, ptext SLIT("->")])
4 (pprExpr sty expr)
pprExpr sty (TyApp expr [ty])
- = ppHang (pprExpr sty expr) 4 (pprParendGenType sty ty)
+ = hang (pprExpr sty expr) 4 (pprParendGenType sty ty)
pprExpr sty (TyApp expr tys)
- = ppHang (pprExpr sty expr)
- 4 (ppBracket (interpp'SP sty tys))
+ = hang (pprExpr sty expr)
+ 4 (brackets (interpp'SP sty tys))
pprExpr sty (DictLam dictvars expr)
- = ppHang (ppCat [ppStr "\\{-dict-}", interppSP sty dictvars, ppStr "->"])
+ = hang (hsep [ptext SLIT("\\{-dict-}"), interppSP sty dictvars, ptext SLIT("->")])
4 (pprExpr sty expr)
pprExpr sty (DictApp expr [dname])
- = ppHang (pprExpr sty expr) 4 (ppr sty dname)
+ = hang (pprExpr sty expr) 4 (ppr sty dname)
pprExpr sty (DictApp expr dnames)
- = ppHang (pprExpr sty expr)
- 4 (ppBracket (interpp'SP sty dnames))
+ = hang (pprExpr sty expr)
+ 4 (brackets (interpp'SP sty dnames))
pprExpr sty (ClassDictLam dicts methods expr)
- = ppHang (ppCat [ppStr "\\{-classdict-}",
- ppBracket (interppSP sty dicts),
- ppBracket (interppSP sty methods),
- ppStr "->"])
+ = hang (hsep [ptext SLIT("\\{-classdict-}"),
+ brackets (interppSP sty dicts),
+ brackets (interppSP sty methods),
+ ptext SLIT("->")])
4 (pprExpr sty expr)
pprExpr sty (Dictionary dicts methods)
- = ppSep [ppBesides [ppLparen, ppPStr SLIT("{-dict-}")],
- ppBracket (interpp'SP sty dicts),
- ppBesides [ppBracket (interpp'SP sty methods), ppRparen]]
+ = parens (sep [ptext SLIT("{-dict-}"),
+ brackets (interpp'SP sty dicts),
+ brackets (interpp'SP sty methods)])
pprExpr sty (SingleDict dname)
- = ppCat [ppPStr SLIT("{-singleDict-}"), ppr sty dname]
+ = hsep [ptext SLIT("{-singleDict-}"), ppr sty dname]
+
\end{code}
Parenthesize unless very simple:
\begin{code}
pprParendExpr :: (NamedThing id, Outputable id, Outputable pat,
Eq tyvar, Outputable tyvar, Eq uvar, Outputable uvar)
- => PprStyle -> HsExpr tyvar uvar id pat -> Pretty
+ => PprStyle -> HsExpr tyvar uvar id pat -> Doc
pprParendExpr sty expr
= let
case expr of
HsLit l -> ppr sty l
HsLitOut l _ -> ppr sty l
+
HsVar _ -> pp_as_was
ExplicitList _ -> pp_as_was
ExplicitListOut _ _ -> pp_as_was
ExplicitTuple _ -> pp_as_was
- _ -> ppParens pp_as_was
+ HsPar _ -> pp_as_was
+
+ _ -> parens pp_as_was
\end{code}
%************************************************************************
\begin{code}
pp_rbinds :: (NamedThing id, Outputable id, Outputable pat,
Eq tyvar, Outputable tyvar, Eq uvar, Outputable uvar)
- => PprStyle -> Pretty
- -> HsRecordBinds tyvar uvar id pat -> Pretty
+ => PprStyle -> Doc
+ -> HsRecordBinds tyvar uvar id pat -> Doc
pp_rbinds sty thing rbinds
- = ppHang thing 4
- (ppBesides [ppChar '{', ppInterleave ppComma (map (pp_rbind sty) rbinds), ppChar '}'])
+ = hang thing
+ 4 (braces (hsep (punctuate comma (map (pp_rbind sty) rbinds))))
where
- pp_rbind sty (v, _, True{-pun-}) = ppr sty v
- pp_rbind sty (v, e, _) = ppCat [ppr sty v, ppStr "<-", ppr sty e]
+ pp_rbind sty (v, _, True) | userStyle sty = ppr sty v
+ pp_rbind sty (v, e, _) = hsep [ppr sty v, char '=', ppr sty e]
\end{code}
%************************************************************************
%* *
-\subsection{Do stmts}
+\subsection{Do stmts and list comprehensions}
%* *
%************************************************************************
\begin{code}
+data DoOrListComp = DoStmt | ListComp
+
+pprDo DoStmt sty stmts
+ = hang (ptext SLIT("do")) 2 (vcat (map (ppr sty) stmts))
+pprDo ListComp sty stmts
+ = hang (hsep [lbrack, pprExpr sty expr, char '|'])
+ 4 (sep [interpp'SP sty quals, rbrack])
+ where
+ ReturnStmt expr = last stmts -- Last stmt should be a ReturnStmt for list comps
+ quals = init stmts
+\end{code}
+
+\begin{code}
data Stmt tyvar uvar id pat
= BindStmt pat
(HsExpr tyvar uvar id pat)
SrcLoc
- | ExprStmt (HsExpr tyvar uvar id pat)
- SrcLoc
+
| LetStmt (HsBinds tyvar uvar id pat)
+
+ | GuardStmt (HsExpr tyvar uvar id pat) -- List comps only
+ SrcLoc
+
+ | ExprStmt (HsExpr tyvar uvar id pat) -- Do stmts only
+ SrcLoc
+
+ | ReturnStmt (HsExpr tyvar uvar id pat) -- List comps only, at the end
\end{code}
\begin{code}
instance (NamedThing id, Outputable id, Outputable pat,
Eq tyvar, Outputable tyvar, Eq uvar, Outputable uvar) =>
Outputable (Stmt tyvar uvar id pat) where
- ppr sty (BindStmt pat expr _)
- = ppCat [ppr sty pat, ppStr "<-", ppr sty expr]
- ppr sty (LetStmt binds)
- = ppCat [ppPStr SLIT("let"), ppr sty binds]
- ppr sty (ExprStmt expr _)
- = ppr sty expr
+ ppr sty stmt = pprQuote sty $ \ sty -> pprStmt sty stmt
+
+pprStmt sty (BindStmt pat expr _)
+ = hsep [ppr sty pat, ptext SLIT("<-"), ppr sty expr]
+pprStmt sty (LetStmt binds)
+ = hsep [ptext SLIT("let"), ppr sty binds]
+pprStmt sty (ExprStmt expr _)
+ = ppr sty expr
+pprStmt sty (GuardStmt expr _)
+ = ppr sty expr
+pprStmt sty (ReturnStmt expr)
+ = hsep [ptext SLIT("return"), ppr sty expr]
\end{code}
%************************************************************************
instance (NamedThing id, Outputable id, Outputable pat,
Eq tyvar, Outputable tyvar, Eq uvar, Outputable uvar) =>
Outputable (ArithSeqInfo tyvar uvar id pat) where
- ppr sty (From e1) = ppBesides [ppr sty e1, pp_dotdot]
- ppr sty (FromThen e1 e2) = ppBesides [ppr sty e1, pp'SP, ppr sty e2, pp_dotdot]
- ppr sty (FromTo e1 e3) = ppBesides [ppr sty e1, pp_dotdot, ppr sty e3]
+ ppr sty (From e1) = hcat [ppr sty e1, pp_dotdot]
+ ppr sty (FromThen e1 e2) = hcat [ppr sty e1, comma, space, ppr sty e2, pp_dotdot]
+ ppr sty (FromTo e1 e3) = hcat [ppr sty e1, pp_dotdot, ppr sty e3]
ppr sty (FromThenTo e1 e2 e3)
- = ppBesides [ppr sty e1, pp'SP, ppr sty e2, pp_dotdot, ppr sty e3]
-
-pp_dotdot = ppPStr SLIT(" .. ")
-\end{code}
+ = hcat [ppr sty e1, comma, space, ppr sty e2, pp_dotdot, ppr sty e3]
-``Qualifiers'' in list comprehensions:
-\begin{code}
-data Qual tyvar uvar id pat
- = GeneratorQual pat
- (HsExpr tyvar uvar id pat)
- | LetQual (HsBinds tyvar uvar id pat)
- | FilterQual (HsExpr tyvar uvar id pat)
-\end{code}
-
-\begin{code}
-instance (NamedThing id, Outputable id, Outputable pat,
- Eq tyvar, Outputable tyvar, Eq uvar, Outputable uvar) =>
- Outputable (Qual tyvar uvar id pat) where
- ppr sty (GeneratorQual pat expr)
- = ppCat [ppr sty pat, ppStr "<-", ppr sty expr]
- ppr sty (LetQual binds)
- = ppCat [ppPStr SLIT("let"), ppr sty binds]
- ppr sty (FilterQual expr)
- = ppr sty expr
+pp_dotdot = ptext SLIT(" .. ")
\end{code}
projects / ghc-hetmet.git / blobdiff