Parser.y.pp 93.9 KB
Newer Older
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
1
--                                                              -*-haskell-*-
2 3 4 5 6 7 8 9 10
-- ---------------------------------------------------------------------------
-- (c) The University of Glasgow 1997-2003
---
-- The GHC grammar.
--
-- Author(s): Simon Marlow, Sven Panne 1997, 1998, 1999
-- ---------------------------------------------------------------------------

{
11
{-# LANGUAGE BangPatterns #-} -- required for versions of Happy before 1.18.6
12
{-# OPTIONS -Wwarn -w #-}
13 14 15 16 17 18
-- The above warning supression flag is a temporary kludge.
-- While working on this module you are encouraged to remove it and fix
-- any warnings in the module. See
--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
-- for details

19 20 21 22 23 24 25 26
{-# OPTIONS_GHC -O0 -fno-ignore-interface-pragmas #-}
{-
Careful optimisation of the parser: we don't want to throw everything
at it, because that takes too long and doesn't buy much, but we do want
to inline certain key external functions, so we instruct GHC not to
throw away inlinings as it would normally do in -O0 mode.
-}

27
module Parser ( parseModule, parseStmt, parseIdentifier, parseType,
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
28
                parseHeader ) where
29 30 31

import HsSyn
import RdrHsSyn
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
32
import HscTypes         ( IsBootInterface, WarningTxt(..) )
33 34
import Lexer
import RdrName
35
import TcEvidence       ( emptyTcEvBinds )
dreixel's avatar
dreixel committed
36
import TysPrim          ( liftedTypeKindTyConName, eqPrimTyCon )
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
37
import TysWiredIn       ( unitTyCon, unitDataCon, tupleTyCon, tupleCon, nilDataCon,
38
                          unboxedUnitTyCon, unboxedUnitDataCon,
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
39 40
                          listTyCon_RDR, parrTyCon_RDR, consDataCon_RDR, eqTyCon_RDR )
import Type             ( funTyCon )
41
import ForeignCall
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
42 43
import OccName          ( varName, dataName, tcClsName, tvName )
import DataCon          ( DataCon, dataConName )
Ian Lynagh's avatar
Ian Lynagh committed
44
import SrcLoc
45
import Module
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
46
import StaticFlags      ( opt_SccProfilingOn, opt_Hpc )
dreixel's avatar
dreixel committed
47
import Kind             ( Kind, liftedTypeKind, unliftedTypeKind, mkArrowKind )
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
48
import Class            ( FunDep )
49
import BasicTypes
50
import DynFlags
51
import OrdList
52
import HaddockUtils
53 54

import FastString
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
55
import Maybes           ( orElse )
56
import Outputable
57

58
import Control.Monad    ( unless )
Simon Marlow's avatar
Simon Marlow committed
59
import GHC.Exts
60 61
import Data.Char
import Control.Monad    ( mplus )
62 63 64
}

{-
65 66 67 68 69 70 71 72 73 74 75
-----------------------------------------------------------------------------
24 Februar 2006

Conflicts: 33 shift/reduce
           1 reduce/reduce

The reduce/reduce conflict is weird.  It's between tyconsym and consym, and I
would think the two should never occur in the same context.

  -=chak

76 77 78 79 80 81 82 83 84 85 86
-----------------------------------------------------------------------------
31 December 2006

Conflicts: 34 shift/reduce
           1 reduce/reduce

The reduce/reduce conflict is weird.  It's between tyconsym and consym, and I
would think the two should never occur in the same context.

  -=chak

87 88 89 90 91 92 93 94 95 96 97
-----------------------------------------------------------------------------
6 December 2006

Conflicts: 32 shift/reduce
           1 reduce/reduce

The reduce/reduce conflict is weird.  It's between tyconsym and consym, and I
would think the two should never occur in the same context.

  -=chak

98 99 100 101 102 103 104 105 106 107 108
-----------------------------------------------------------------------------
26 July 2006

Conflicts: 37 shift/reduce
           1 reduce/reduce

The reduce/reduce conflict is weird.  It's between tyconsym and consym, and I
would think the two should never occur in the same context.

  -=chak

109
-----------------------------------------------------------------------------
110
Conflicts: 38 shift/reduce (1.25)
111

chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
112 113 114
10 for abiguity in 'if x then y else z + 1'             [State 178]
        (shift parses as 'if x then y else (z + 1)', as per longest-parse rule)
        10 because op might be: : - ! * . `x` VARSYM CONSYM QVARSYM QCONSYM
115

chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
116 117
1 for ambiguity in 'if x then y else z :: T'            [State 178]
        (shift parses as 'if x then y else (z :: T)', as per longest-parse rule)
118

chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
119 120 121
4 for ambiguity in 'if x then y else z -< e'            [State 178]
        (shift parses as 'if x then y else (z -< T)', as per longest-parse rule)
        There are four such operators: -<, >-, -<<, >>-
122 123


chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
124 125 126 127
2 for ambiguity in 'case v of { x :: T -> T ... } '     [States 11, 253]
        Which of these two is intended?
          case v of
            (x::T) -> T         -- Rhs is T
128
    or
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
129 130
          case v of
            (x::T -> T) -> ..   -- Rhs is ...
ross's avatar
ross committed
131

chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
132 133 134
10 for ambiguity in 'e :: a `b` c'.  Does this mean     [States 11, 253]
        (e::a) `b` c, or 
        (e :: (a `b` c))
135
    As well as `b` we can have !, VARSYM, QCONSYM, and CONSYM, hence 5 cases
136
    Same duplication between states 11 and 253 as the previous case
137

chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
138 139 140 141
1 for ambiguity in 'let ?x ...'                         [State 329]
        the parser can't tell whether the ?x is the lhs of a normal binding or
        an implicit binding.  Fortunately resolving as shift gives it the only
        sensible meaning, namely the lhs of an implicit binding.
142

chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
143 144 145 146
1 for ambiguity in '{-# RULES "name" [ ... #-}          [State 382]
        we don't know whether the '[' starts the activation or not: it
        might be the start of the declaration with the activation being
        empty.  --SDM 1/4/2002
147

chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
148 149 150 151 152 153 154
1 for ambiguity in '{-# RULES "name" forall = ... #-}'  [State 474]
        since 'forall' is a valid variable name, we don't know whether
        to treat a forall on the input as the beginning of a quantifier
        or the beginning of the rule itself.  Resolving to shift means
        it's always treated as a quantifier, hence the above is disallowed.
        This saves explicitly defining a grammar for the rule lhs that
        doesn't include 'forall'.
155

156 157 158 159
1 for ambiguity when the source file starts with "-- | doc". We need another
  token of lookahead to determine if a top declaration or the 'module' keyword
  follows. Shift parses as if the 'module' keyword follows.   

160 161 162 163 164 165 166 167 168 169
-- ---------------------------------------------------------------------------
-- Adding location info

This is done in a stylised way using the three macros below, L0, L1
and LL.  Each of these macros can be thought of as having type

   L0, L1, LL :: a -> Located a

They each add a SrcSpan to their argument.

chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
170
   L0   adds 'noSrcSpan', used for empty productions
171
     -- This doesn't seem to work anymore -=chak
172 173

   L1   for a production with a single token on the lhs.  Grabs the SrcSpan
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
174
        from that token.
175 176 177 178 179 180 181 182 183

   LL   for a production with >1 token on the lhs.  Makes up a SrcSpan from
        the first and last tokens.

These suffice for the majority of cases.  However, we must be
especially careful with empty productions: LL won't work if the first
or last token on the lhs can represent an empty span.  In these cases,
we have to calculate the span using more of the tokens from the lhs, eg.

chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
184 185 186
        | 'newtype' tycl_hdr '=' newconstr deriving
                { L (comb3 $1 $4 $5)
                    (mkTyData NewType (unLoc $2) [$4] (unLoc $5)) }
187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206

We provide comb3 and comb4 functions which are useful in such cases.

Be careful: there's no checking that you actually got this right, the
only symptom will be that the SrcSpans of your syntax will be
incorrect.

/*
 * We must expand these macros *before* running Happy, which is why this file is
 * Parser.y.pp rather than just Parser.y - we run the C pre-processor first.
 */
#define L0   L noSrcSpan
#define L1   sL (getLoc $1)
#define LL   sL (comb2 $1 $>)

-- -----------------------------------------------------------------------------

-}

%token
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239
 '_'            { L _ ITunderscore }            -- Haskell keywords
 'as'           { L _ ITas }
 'case'         { L _ ITcase }          
 'class'        { L _ ITclass } 
 'data'         { L _ ITdata } 
 'default'      { L _ ITdefault }
 'deriving'     { L _ ITderiving }
 'do'           { L _ ITdo }
 'else'         { L _ ITelse }
 'hiding'       { L _ IThiding }
 'if'           { L _ ITif }
 'import'       { L _ ITimport }
 'in'           { L _ ITin }
 'infix'        { L _ ITinfix }
 'infixl'       { L _ ITinfixl }
 'infixr'       { L _ ITinfixr }
 'instance'     { L _ ITinstance }
 'let'          { L _ ITlet }
 'module'       { L _ ITmodule }
 'newtype'      { L _ ITnewtype }
 'of'           { L _ ITof }
 'qualified'    { L _ ITqualified }
 'then'         { L _ ITthen }
 'type'         { L _ ITtype }
 'where'        { L _ ITwhere }
 '_scc_'        { L _ ITscc }         -- ToDo: remove

 'forall'       { L _ ITforall }                -- GHC extension keywords
 'foreign'      { L _ ITforeign }
 'export'       { L _ ITexport }
 'label'        { L _ ITlabel } 
 'dynamic'      { L _ ITdynamic }
 'safe'         { L _ ITsafe }
240
 'interruptible' { L _ ITinterruptible }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
241 242 243
 'unsafe'       { L _ ITunsafe }
 'mdo'          { L _ ITmdo }
 'family'       { L _ ITfamily }
244 245
 'stdcall'      { L _ ITstdcallconv }
 'ccall'        { L _ ITccallconv }
246
 'capi'         { L _ ITcapiconv }
247
 'prim'         { L _ ITprimcallconv }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
248 249
 'proc'         { L _ ITproc }          -- for arrow notation extension
 'rec'          { L _ ITrec }           -- for arrow notation extension
250 251 252
 'group'    { L _ ITgroup }     -- for list transform extension
 'by'       { L _ ITby }        -- for list transform extension
 'using'    { L _ ITusing }     -- for list transform extension
253

254 255
 '{-# INLINE'             { L _ (ITinline_prag _ _) }
 '{-# SPECIALISE'         { L _ ITspec_prag }
256
 '{-# SPECIALISE_INLINE'  { L _ (ITspec_inline_prag _) }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
257 258 259
 '{-# SOURCE'                                   { L _ ITsource_prag }
 '{-# RULES'                                    { L _ ITrules_prag }
 '{-# CORE'                                     { L _ ITcore_prag }              -- hdaume: annotated core
260 261 262 263 264
 '{-# SCC'                { L _ ITscc_prag }
 '{-# GENERATED'          { L _ ITgenerated_prag }
 '{-# DEPRECATED'         { L _ ITdeprecated_prag }
 '{-# WARNING'            { L _ ITwarning_prag }
 '{-# UNPACK'             { L _ ITunpack_prag }
265
 '{-# NOUNPACK'           { L _ ITnounpack_prag }
266
 '{-# ANN'                { L _ ITann_prag }
267 268
 '{-# VECTORISE'          { L _ ITvect_prag }
 '{-# VECTORISE_SCALAR'   { L _ ITvect_scalar_prag }
269
 '{-# NOVECTORISE'        { L _ ITnovect_prag }
270
 '{-# CTYPE'              { L _ ITctype }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310
 '#-}'                                          { L _ ITclose_prag }

 '..'           { L _ ITdotdot }                        -- reserved symbols
 ':'            { L _ ITcolon }
 '::'           { L _ ITdcolon }
 '='            { L _ ITequal }
 '\\'           { L _ ITlam }
 '|'            { L _ ITvbar }
 '<-'           { L _ ITlarrow }
 '->'           { L _ ITrarrow }
 '@'            { L _ ITat }
 '~'            { L _ ITtilde }
 '~#'           { L _ ITtildehsh }
 '=>'           { L _ ITdarrow }
 '-'            { L _ ITminus }
 '!'            { L _ ITbang }
 '*'            { L _ ITstar }
 '-<'           { L _ ITlarrowtail }            -- for arrow notation
 '>-'           { L _ ITrarrowtail }            -- for arrow notation
 '-<<'          { L _ ITLarrowtail }            -- for arrow notation
 '>>-'          { L _ ITRarrowtail }            -- for arrow notation
 '.'            { L _ ITdot }

 '{'            { L _ ITocurly }                        -- special symbols
 '}'            { L _ ITccurly }
 vocurly        { L _ ITvocurly } -- virtual open curly (from layout)
 vccurly        { L _ ITvccurly } -- virtual close curly (from layout)
 '['            { L _ ITobrack }
 ']'            { L _ ITcbrack }
 '[:'           { L _ ITopabrack }
 ':]'           { L _ ITcpabrack }
 '('            { L _ IToparen }
 ')'            { L _ ITcparen }
 '(#'           { L _ IToubxparen }
 '#)'           { L _ ITcubxparen }
 '(|'           { L _ IToparenbar }
 '|)'           { L _ ITcparenbar }
 ';'            { L _ ITsemi }
 ','            { L _ ITcomma }
 '`'            { L _ ITbackquote }
dreixel's avatar
dreixel committed
311
 SIMPLEQUOTE    { L _ ITsimpleQuote      }     -- 'x
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
312 313 314 315 316 317 318 319 320

 VARID          { L _ (ITvarid    _) }          -- identifiers
 CONID          { L _ (ITconid    _) }
 VARSYM         { L _ (ITvarsym   _) }
 CONSYM         { L _ (ITconsym   _) }
 QVARID         { L _ (ITqvarid   _) }
 QCONID         { L _ (ITqconid   _) }
 QVARSYM        { L _ (ITqvarsym  _) }
 QCONSYM        { L _ (ITqconsym  _) }
321 322
 PREFIXQVARSYM  { L _ (ITprefixqvarsym  _) }
 PREFIXQCONSYM  { L _ (ITprefixqconsym  _) }
323

chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341
 IPDUPVARID     { L _ (ITdupipvarid   _) }              -- GHC extension

 CHAR           { L _ (ITchar     _) }
 STRING         { L _ (ITstring   _) }
 INTEGER        { L _ (ITinteger  _) }
 RATIONAL       { L _ (ITrational _) }
                    
 PRIMCHAR       { L _ (ITprimchar   _) }
 PRIMSTRING     { L _ (ITprimstring _) }
 PRIMINTEGER    { L _ (ITprimint    _) }
 PRIMWORD       { L _ (ITprimword  _) }
 PRIMFLOAT      { L _ (ITprimfloat  _) }
 PRIMDOUBLE     { L _ (ITprimdouble _) }

 DOCNEXT        { L _ (ITdocCommentNext _) }
 DOCPREV        { L _ (ITdocCommentPrev _) }
 DOCNAMED       { L _ (ITdocCommentNamed _) }
 DOCSECTION     { L _ (ITdocSection _ _) }
342

343 344 345 346 347 348 349
-- Template Haskell 
'[|'            { L _ ITopenExpQuote  }       
'[p|'           { L _ ITopenPatQuote  }      
'[t|'           { L _ ITopenTypQuote  }      
'[d|'           { L _ ITopenDecQuote  }      
'|]'            { L _ ITcloseQuote    }
TH_ID_SPLICE    { L _ (ITidEscape _)  }     -- $x
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
350 351 352
'$('            { L _ ITparenEscape   }     -- $( exp )
TH_TY_QUOTE     { L _ ITtyQuote       }      -- ''T
TH_QUASIQUOTE   { L _ (ITquasiQuote _) }
353
TH_QQUASIQUOTE  { L _ (ITqQuasiQuote _) }
354 355 356 357 358 359

%monad { P } { >>= } { return }
%lexer { lexer } { L _ ITeof }
%name parseModule module
%name parseStmt   maybe_stmt
%name parseIdentifier  identifier
360
%name parseType ctype
361
%partial parseHeader header
362
%tokentype { (Located Token) }
363 364
%%

365 366 367
-----------------------------------------------------------------------------
-- Identifiers; one of the entry points
identifier :: { Located RdrName }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
368 369 370 371
        : qvar                          { $1 }
        | qcon                          { $1 }
        | qvarop                        { $1 }
        | qconop                        { $1 }
372
    | '(' '->' ')'      { LL $ getRdrName funTyCon }
373

374 375 376 377 378 379 380 381 382 383
-----------------------------------------------------------------------------
-- Module Header

-- The place for module deprecation is really too restrictive, but if it
-- was allowed at its natural place just before 'module', we get an ugly
-- s/r conflict with the second alternative. Another solution would be the
-- introduction of a new pragma DEPRECATED_MODULE, but this is not very nice,
-- either, and DEPRECATED is only expected to be used by people who really
-- know what they are doing. :-)

chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
384 385 386 387
module  :: { Located (HsModule RdrName) }
        : maybedocheader 'module' modid maybemodwarning maybeexports 'where' body
                {% fileSrcSpan >>= \ loc ->
                   return (L loc (HsModule (Just $3) $5 (fst $7) (snd $7) $4 $1
388
                          ) )}
389
        | body2
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
390 391
                {% fileSrcSpan >>= \ loc ->
                   return (L loc (HsModule Nothing Nothing
392 393
                          (fst $1) (snd $1) Nothing Nothing
                          )) }
394

395
maybedocheader :: { Maybe LHsDocString }
396
        : moduleheader            { $1 }
397
        | {- empty -}             { Nothing }
398 399

missing_module_keyword :: { () }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
400
        : {- empty -}                           {% pushCurrentContext }
401

Ian Lynagh's avatar
Ian Lynagh committed
402
maybemodwarning :: { Maybe WarningTxt }
403 404
    : '{-# DEPRECATED' strings '#-}' { Just (DeprecatedTxt $ unLoc $2) }
    | '{-# WARNING' strings '#-}'    { Just (WarningTxt $ unLoc $2) }
Ian Lynagh's avatar
Ian Lynagh committed
405
    |  {- empty -}                  { Nothing }
406

chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
407 408 409
body    :: { ([LImportDecl RdrName], [LHsDecl RdrName]) }
        :  '{'            top '}'               { $2 }
        |      vocurly    top close             { $2 }
410

chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
411 412 413
body2   :: { ([LImportDecl RdrName], [LHsDecl RdrName]) }
        :  '{' top '}'                          { $2 }
        |  missing_module_keyword top close     { $2 }
414

chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
415 416 417 418
top     :: { ([LImportDecl RdrName], [LHsDecl RdrName]) }
        : importdecls                           { (reverse $1,[]) }
        | importdecls ';' cvtopdecls            { (reverse $1,$3) }
        | cvtopdecls                            { ([],$1) }
419 420

cvtopdecls :: { [LHsDecl RdrName] }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
421
        : topdecls                              { cvTopDecls $1 }
422

423 424 425
-----------------------------------------------------------------------------
-- Module declaration & imports only

chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
426 427 428 429
header  :: { Located (HsModule RdrName) }
        : maybedocheader 'module' modid maybemodwarning maybeexports 'where' header_body
                {% fileSrcSpan >>= \ loc ->
                   return (L loc (HsModule (Just $3) $5 $7 [] $4 $1
430
                          ))}
431
        | header_body2
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
432
                {% fileSrcSpan >>= \ loc ->
433
                   return (L loc (HsModule Nothing Nothing $1 [] Nothing
434
                          Nothing)) }
435 436

header_body :: { [LImportDecl RdrName] }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
437
        :  '{'            importdecls           { $2 }
438 439 440 441 442
        |      vocurly    importdecls           { $2 }

header_body2 :: { [LImportDecl RdrName] }
        :  '{' importdecls                      { $2 }
        |  missing_module_keyword importdecls   { $2 }
443

444 445 446 447
-----------------------------------------------------------------------------
-- The Export List

maybeexports :: { Maybe [LIE RdrName] }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
448 449
        :  '(' exportlist ')'                   { Just $2 }
        |  {- empty -}                          { Nothing }
450

451
exportlist :: { [LIE RdrName] }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
452 453
        : expdoclist ',' expdoclist             { $1 ++ $3 }
        | exportlist1                           { $1 }
454 455

exportlist1 :: { [LIE RdrName] }
456
        : expdoclist export expdoclist ',' exportlist  { $1 ++ ($2 : $3) ++ $5 }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
457 458
        | expdoclist export expdoclist                 { $1 ++ ($2 : $3) }
        | expdoclist                                   { $1 }
459 460 461 462 463 464 465 466 467

expdoclist :: { [LIE RdrName] }
        : exp_doc expdoclist                           { $1 : $2 }
        | {- empty -}                                  { [] }

exp_doc :: { LIE RdrName }                                                   
        : docsection    { L1 (case (unLoc $1) of (n, doc) -> IEGroup n doc) }
        | docnamed      { L1 (IEDocNamed ((fst . unLoc) $1)) } 
        | docnext       { L1 (IEDoc (unLoc $1)) }       
468 469


470 471
   -- No longer allow things like [] and (,,,) to be exported
   -- They are built in syntax, always available
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
472
export  :: { LIE RdrName }
473 474
        : qcname_ext export_subspec     { LL (mkModuleImpExp (unLoc $1)
                                                             (unLoc $2)) }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
475
        |  'module' modid               { LL (IEModuleContents (unLoc $2)) }
476

477 478 479 480
export_subspec :: { Located ImpExpSubSpec }
        : {- empty -}                   { L0 ImpExpAbs }
        | '(' '..' ')'                  { LL ImpExpAll }
        | '(' ')'                       { LL (ImpExpList []) }
481
        | '(' qcnames ')'               { LL (ImpExpList (reverse $2)) }
482

483
qcnames :: { [RdrName] }     -- A reversed list
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
484 485
        :  qcnames ',' qcname_ext       { unLoc $3 : $1 }
        |  qcname_ext                   { [unLoc $1]  }
486

chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
487 488 489
qcname_ext :: { Located RdrName }       -- Variable or data constructor
                                        -- or tagged type constructor
        :  qcname                       { $1 }
490
        |  'type' qcname                {% mkTypeImpExp (LL (unLoc $2)) }
491 492

-- Cannot pull into qcname_ext, as qcname is also used in expression.
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
493 494 495
qcname  :: { Located RdrName }  -- Variable or data constructor
        :  qvar                         { $1 }
        |  qcon                         { $1 }
496 497 498 499 500 501 502 503

-----------------------------------------------------------------------------
-- Import Declarations

-- import decls can be *empty*, or even just a string of semicolons
-- whereas topdecls must contain at least one topdecl.

importdecls :: { [LImportDecl RdrName] }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
504 505 506 507
        : importdecls ';' importdecl            { $3 : $1 }
        | importdecls ';'                       { $1 }
        | importdecl                            { [ $1 ] }
        | {- empty -}                           { [] }
508 509

importdecl :: { LImportDecl RdrName }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
510 511
        : 'import' maybe_src maybe_safe optqualified maybe_pkg modid maybeas maybeimpspec 
                { L (comb4 $1 $6 $7 $8) $
512 513 514 515
                  ImportDecl { ideclName = $6, ideclPkgQual = $5
                             , ideclSource = $2, ideclSafe = $3
                             , ideclQualified = $4, ideclImplicit = False
                             , ideclAs = unLoc $7, ideclHiding = unLoc $8 } }
516 517

maybe_src :: { IsBootInterface }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
518 519
        : '{-# SOURCE' '#-}'                    { True }
        | {- empty -}                           { False }
520

521
maybe_safe :: { Bool }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
522 523
        : 'safe'                                { True }
        | {- empty -}                           { False }
524

525 526 527 528
maybe_pkg :: { Maybe FastString }
        : STRING                                { Just (getSTRING $1) }
        | {- empty -}                           { Nothing }

529
optqualified :: { Bool }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
530 531
        : 'qualified'                           { True  }
        | {- empty -}                           { False }
532

Simon Marlow's avatar
Simon Marlow committed
533
maybeas :: { Located (Maybe ModuleName) }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
534 535
        : 'as' modid                            { LL (Just (unLoc $2)) }
        | {- empty -}                           { noLoc Nothing }
536 537

maybeimpspec :: { Located (Maybe (Bool, [LIE RdrName])) }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
538 539
        : impspec                               { L1 (Just (unLoc $1)) }
        | {- empty -}                           { noLoc Nothing }
540 541

impspec :: { Located (Bool, [LIE RdrName]) }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
542 543
        :  '(' exportlist ')'                   { LL (False, $2) }
        |  'hiding' '(' exportlist ')'          { LL (True,  $3) }
544 545 546 547

-----------------------------------------------------------------------------
-- Fixity Declarations

chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
548 549 550
prec    :: { Int }
        : {- empty -}           { 9 }
        | INTEGER               {% checkPrecP (L1 (fromInteger (getINTEGER $1))) }
551

chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
552 553 554 555
infix   :: { Located FixityDirection }
        : 'infix'                               { L1 InfixN  }
        | 'infixl'                              { L1 InfixL  }
        | 'infixr'                              { L1 InfixR }
556

chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
557 558 559
ops     :: { Located [Located RdrName] }
        : ops ',' op                            { LL ($3 : unLoc $1) }
        | op                                    { L1 [$1] }
560 561 562 563

-----------------------------------------------------------------------------
-- Top-Level Declarations

564
topdecls :: { OrdList (LHsDecl RdrName) }
565 566 567
        : topdecls ';' topdecl                  { $1 `appOL` $3 }
        | topdecls ';'                          { $1 }
        | topdecl                               { $1 }
568

569
topdecl :: { OrdList (LHsDecl RdrName) }
570 571
        : cl_decl                               { unitOL (L1 (TyClD (unLoc $1))) }
        | ty_decl                               { unitOL (L1 (TyClD (unLoc $1))) }
572
        | inst_decl                             { unitOL (L1 (InstD (unLoc $1))) }
573
        | stand_alone_deriving                  { unitOL (LL (DerivD (unLoc $1))) }
574 575
        | 'default' '(' comma_types0 ')'        { unitOL (LL $ DefD (DefaultDecl $3)) }
        | 'foreign' fdecl                       { unitOL (LL (unLoc $2)) }
576 577
        | '{-# DEPRECATED' deprecations '#-}'   { $2 }
        | '{-# WARNING' warnings '#-}'          { $2 }
578
        | '{-# RULES' rules '#-}'               { $2 }
579 580 581
        | '{-# VECTORISE_SCALAR' qvar '#-}'     { unitOL $ LL $ VectD (HsVect       $2 Nothing) }
        | '{-# VECTORISE' qvar '=' exp '#-}'    { unitOL $ LL $ VectD (HsVect       $2 (Just $4)) }
        | '{-# NOVECTORISE' qvar '#-}'          { unitOL $ LL $ VectD (HsNoVect     $2) }
582 583 584 585 586 587 588 589 590
        | '{-# VECTORISE' 'type' gtycon '#-}'     
                                                { unitOL $ LL $ 
                                                    VectD (HsVectTypeIn False $3 Nothing) }
        | '{-# VECTORISE_SCALAR' 'type' gtycon '#-}'     
                                                { unitOL $ LL $ 
                                                    VectD (HsVectTypeIn True $3 Nothing) }
        | '{-# VECTORISE' 'type' gtycon '=' gtycon '#-}'     
                                                { unitOL $ LL $ 
                                                    VectD (HsVectTypeIn False $3 (Just $5)) }
591 592 593
        | '{-# VECTORISE_SCALAR' 'type' gtycon '=' gtycon '#-}'     
                                                { unitOL $ LL $ 
                                                    VectD (HsVectTypeIn True $3 (Just $5)) }
594 595
        | '{-# VECTORISE' 'class' gtycon '#-}'  { unitOL $ LL $ VectD (HsVectClassIn $3) }
        | '{-# VECTORISE_SCALAR' 'instance' type '#-}'     
596
                                                { unitOL $ LL $ VectD (HsVectInstIn $3) }
597 598 599 600 601 602 603 604
        | annotation { unitOL $1 }
        | decl                                  { unLoc $1 }

        -- Template Haskell Extension
        -- The $(..) form is one possible form of infixexp
        -- but we treat an arbitrary expression just as if 
        -- it had a $(..) wrapped around it
        | infixexp                              { unitOL (LL $ mkTopSpliceDecl $1) } 
605

606 607 608
-- Type classes
--
cl_decl :: { LTyClDecl RdrName }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
609
        : 'class' tycl_hdr fds where_cls        {% mkClassDecl (comb4 $1 $2 $3 $4) $2 $3 $4 }
610

611
-- Type declarations (toplevel)
612 613
--
ty_decl :: { LTyClDecl RdrName }
614
           -- ordinary type synonyms
615
        : 'type' type '=' ctypedoc
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
616 617 618 619 620 621 622
                -- Note ctype, not sigtype, on the right of '='
                -- We allow an explicit for-all but we don't insert one
                -- in   type Foo a = (b,b)
                -- Instead we just say b is out of scope
                --
                -- Note the use of type for the head; this allows
                -- infix type constructors to be declared 
623
                {% mkTySynonym (comb2 $1 $4) $2 $4 }
624 625

           -- type family declarations
626
        | 'type' 'family' type opt_kind_sig 
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
627 628 629
                -- Note the use of type for the head; this allows
                -- infix type constructors to be declared
                {% mkTyFamily (comb3 $1 $3 $4) TypeFamily $3 (unLoc $4) }
630

631
          -- ordinary data type or newtype declaration
632
        | data_or_newtype capi_ctype tycl_hdr constrs deriving
633
                {% mkTyData (comb4 $1 $3 $4 $5) (unLoc $1) $2 $3 
634
                            Nothing (reverse (unLoc $4)) (unLoc $5) }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
635 636
                                   -- We need the location on tycl_hdr in case 
                                   -- constrs and deriving are both empty
637

638
          -- ordinary GADT declaration
639
        | data_or_newtype capi_ctype tycl_hdr opt_kind_sig 
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
640 641
                 gadt_constrlist
                 deriving
642
                {% mkTyData (comb4 $1 $3 $5 $6) (unLoc $1) $2 $3 
643
                            (unLoc $4) (unLoc $5) (unLoc $6) }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
644 645
                                   -- We need the location on tycl_hdr in case 
                                   -- constrs and deriving are both empty
646

647
          -- data/newtype family
648
        | 'data' 'family' type opt_kind_sig
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
649
                {% mkTyFamily (comb3 $1 $2 $4) DataFamily $3 (unLoc $4) }
650

651 652
inst_decl :: { LInstDecl RdrName }
        : 'instance' inst_type where_inst
653 654
                 { let (binds, sigs, _, ats, _) = cvBindsAndSigs (unLoc $3)
                   in L (comb3 $1 $2 $3) (ClsInstD $2 binds sigs ats) }
655 656

           -- type instance declarations
657
        | 'type' 'instance' type '=' ctype
658 659
                -- Note the use of type for the head; this allows
                -- infix type constructors and type patterns
660 661
                {% do { L loc d <- mkFamInstSynonym (comb2 $1 $5) $3 $5
                      ; return (L loc (FamInstD d)) } }
662

663
          -- data/newtype instance declaration
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
664
        | data_or_newtype 'instance' tycl_hdr constrs deriving
665
                {% do { L loc d <- mkFamInstData (comb4 $1 $3 $4 $5) (unLoc $1) Nothing $3
666
                                      Nothing (reverse (unLoc $4)) (unLoc $5)
667
                      ; return (L loc (FamInstD d)) } }
668

669
          -- GADT instance declaration
670
        | data_or_newtype 'instance' tycl_hdr opt_kind_sig 
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
671 672
                 gadt_constrlist
                 deriving
673
                {% do { L loc d <- mkFamInstData (comb4 $1 $3 $5 $6) (unLoc $1) Nothing $3
674
                                            (unLoc $4) (unLoc $5) (unLoc $6)
675
                      ; return (L loc (FamInstD d)) } }
676
        
677
-- Associated type family declarations
678 679 680 681 682 683 684
--
-- * They have a different syntax than on the toplevel (no family special
--   identifier).
--
-- * They also need to be separate from instances; otherwise, data family
--   declarations without a kind signature cause parsing conflicts with empty
--   data declarations. 
685
--
686 687
at_decl_cls :: { LHsDecl RdrName }
           -- family declarations
688
        : 'type' type opt_kind_sig
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
689
                -- Note the use of type for the head; this allows
690
                -- infix type constructors to be declared.
691 692 693 694 695 696
                {% do { L loc decl <- mkTyFamily (comb3 $1 $2 $3) TypeFamily $2 (unLoc $3)
                      ; return (L loc (TyClD decl)) } }

        | 'data' type opt_kind_sig
                {% do { L loc decl <- mkTyFamily (comb3 $1 $2 $3) DataFamily $2 (unLoc $3)
                      ; return (L loc (TyClD decl)) } }
697

698
           -- default type instance
699
        | 'type' type '=' ctype
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
700 701
                -- Note the use of type for the head; this allows
                -- infix type constructors and type patterns
702 703
                {% do { L loc fid <- mkFamInstSynonym (comb2 $1 $4) $2 $4
                      ; return (L loc (InstD (FamInstD fid))) } }
704 705

-- Associated type instances
706
--
707
at_decl_inst :: { LFamInstDecl RdrName }
708
           -- type instance declarations
709
        : 'type' type '=' ctype
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
710 711
                -- Note the use of type for the head; this allows
                -- infix type constructors and type patterns
712
                {% mkFamInstSynonym (comb2 $1 $4) $2 $4 }
713 714

        -- data/newtype instance declaration
715
        | data_or_newtype capi_ctype tycl_hdr constrs deriving
716 717
                {% mkFamInstData (comb4 $1 $3 $4 $5) (unLoc $1) $2 $3 
                                 Nothing (reverse (unLoc $4)) (unLoc $5) }
718 719

        -- GADT instance declaration
720
        | data_or_newtype capi_ctype tycl_hdr opt_kind_sig 
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
721 722
                 gadt_constrlist
                 deriving
723 724
                {% mkFamInstData (comb4 $1 $3 $5 $6) (unLoc $1) $2 $3 
                                 (unLoc $4) (unLoc $5) (unLoc $6) }
725

726
data_or_newtype :: { Located NewOrData }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
727 728
        : 'data'        { L1 DataType }
        | 'newtype'     { L1 NewType }
729

730
opt_kind_sig :: { Located (Maybe (HsBndrSig (LHsKind RdrName))) }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
731
        :                               { noLoc Nothing }
732
        | '::' kind                     { LL (Just (mkHsBSig $2)) }
733

734
-- tycl_hdr parses the header of a class or data type decl,
735
-- which takes the form
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
736 737 738 739
--      T a b
--      Eq a => T a
--      (Eq a, Ord b) => T a b
--      T Int [a]                       -- for associated types
740
-- Rather a lot of inlining here, else we get reduce/reduce errors
741
tycl_hdr :: { Located (Maybe (LHsContext RdrName), LHsType RdrName) }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
742 743
        : context '=>' type             { LL (Just $1, $3) }
        | type                          { L1 (Nothing, $1) }
744

745
capi_ctype :: { Maybe CType }
746 747
capi_ctype : '{-# CTYPE' STRING STRING '#-}' { Just (CType (Just (Header (getSTRING $2))) (getSTRING $3)) }
           | '{-# CTYPE'        STRING '#-}' { Just (CType Nothing                        (getSTRING $2)) }
748
           |                                 { Nothing }
749

750 751 752 753 754
-----------------------------------------------------------------------------
-- Stand-alone deriving

-- Glasgow extension: stand-alone deriving declarations
stand_alone_deriving :: { LDerivDecl RdrName }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
755
        : 'deriving' 'instance' inst_type { LL (DerivDecl $3) }
756

757 758 759
-----------------------------------------------------------------------------
-- Nested declarations

760
-- Declaration in class bodies
761
--
762
decl_cls  :: { Located (OrdList (LHsDecl RdrName)) }
763
decl_cls  : at_decl_cls                 { LL (unitOL $1) }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
764
          | decl                        { $1 }
765

chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
766
          -- A 'default' signature used with the generic-programming extension
767 768 769 770
          | 'default' infixexp '::' sigtypedoc
                    {% do { (TypeSig l ty) <- checkValSig $2 $4
                          ; return (LL $ unitOL (LL $ SigD (GenericSig l ty))) } }

chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
771 772 773 774 775
decls_cls :: { Located (OrdList (LHsDecl RdrName)) }    -- Reversed
          : decls_cls ';' decl_cls      { LL (unLoc $1 `appOL` unLoc $3) }
          | decls_cls ';'               { LL (unLoc $1) }
          | decl_cls                    { $1 }
          | {- empty -}                 { noLoc nilOL }
776 777


778
decllist_cls
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
779 780 781
        :: { Located (OrdList (LHsDecl RdrName)) }      -- Reversed
        : '{'         decls_cls '}'     { LL (unLoc $2) }
        |     vocurly decls_cls close   { $2 }
782

783
-- Class body
784
--
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
785 786 787 788 789
where_cls :: { Located (OrdList (LHsDecl RdrName)) }    -- Reversed
                                -- No implicit parameters
                                -- May have type declarations
        : 'where' decllist_cls          { LL (unLoc $2) }
        | {- empty -}                   { noLoc nilOL }
790 791 792 793

-- Declarations in instance bodies
--
decl_inst  :: { Located (OrdList (LHsDecl RdrName)) }
794
decl_inst  : at_decl_inst               { LL (unitOL (L1 (InstD (FamInstD (unLoc $1))))) }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
795
           | decl                       { $1 }
796

chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
797 798 799 800 801
decls_inst :: { Located (OrdList (LHsDecl RdrName)) }   -- Reversed
           : decls_inst ';' decl_inst   { LL (unLoc $1 `appOL` unLoc $3) }
           | decls_inst ';'             { LL (unLoc $1) }
           | decl_inst                  { $1 }
           | {- empty -}                { noLoc nilOL }
802 803

decllist_inst 
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
804 805 806
        :: { Located (OrdList (LHsDecl RdrName)) }      -- Reversed
        : '{'         decls_inst '}'    { LL (unLoc $2) }
        |     vocurly decls_inst close  { $2 }
807 808 809

-- Instance body
--
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
810 811 812 813 814
where_inst :: { Located (OrdList (LHsDecl RdrName)) }   -- Reversed
                                -- No implicit parameters
                                -- May have type declarations
        : 'where' decllist_inst         { LL (unLoc $2) }
        | {- empty -}                   { noLoc nilOL }
815

816 817
-- Declarations in binding groups other than classes and instances
--
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
818 819
decls   :: { Located (OrdList (LHsDecl RdrName)) }      
        : decls ';' decl                { let { this = unLoc $3;
Ian Lynagh's avatar
Ian Lynagh committed
820
                                    rest = unLoc $1;
Ian Lynagh's avatar
Ian Lynagh committed
821
                                    these = rest `appOL` this }
Ian Lynagh's avatar
Ian Lynagh committed
822 823
                              in rest `seq` this `seq` these `seq`
                                    LL these }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
824 825 826
        | decls ';'                     { LL (unLoc $1) }
        | decl                          { $1 }
        | {- empty -}                   { noLoc nilOL }
827

828
decllist :: { Located (OrdList (LHsDecl RdrName)) }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
829 830
        : '{'            decls '}'      { LL (unLoc $2) }
        |     vocurly    decls close    { $2 }
831

832 833
-- Binding groups other than those of class and instance declarations
--
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
834 835 836 837 838
binds   ::  { Located (HsLocalBinds RdrName) }          -- May have implicit parameters
                                                -- No type declarations
        : decllist                      { L1 (HsValBinds (cvBindGroup (unLoc $1))) }
        | '{'            dbinds '}'     { LL (HsIPBinds (IPBinds (unLoc $2) emptyTcEvBinds)) }
        |     vocurly    dbinds close   { L (getLoc $2) (HsIPBinds (IPBinds (unLoc $2) emptyTcEvBinds)) }
839

chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
840 841 842 843
wherebinds :: { Located (HsLocalBinds RdrName) }        -- May have implicit parameters
                                                -- No type declarations
        : 'where' binds                 { LL (unLoc $2) }
        | {- empty -}                   { noLoc emptyLocalBinds }
844 845 846 847 848


-----------------------------------------------------------------------------
-- Transformation Rules

chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
849 850 851 852 853
rules   :: { OrdList (LHsDecl RdrName) }
        :  rules ';' rule                       { $1 `snocOL` $3 }
        |  rules ';'                            { $1 }
        |  rule                                 { unitOL $1 }
        |  {- empty -}                          { nilOL }
854

chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
855 856 857 858 859
rule    :: { LHsDecl RdrName }
        : STRING activation rule_forall infixexp '=' exp
             { LL $ RuleD (HsRule (getSTRING $1) 
                                  ($2 `orElse` AlwaysActive) 
                                  $3 $4 placeHolderNames $6 placeHolderNames) }
860

861 862 863
activation :: { Maybe Activation } 
        : {- empty -}                           { Nothing }
        | explicit_activation                   { Just $1 }
864 865

explicit_activation :: { Activation }  -- In brackets
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
866 867
        : '[' INTEGER ']'               { ActiveAfter  (fromInteger (getINTEGER $2)) }
        | '[' '~' INTEGER ']'           { ActiveBefore (fromInteger (getINTEGER $3)) }
868 869

rule_forall :: { [RuleBndr RdrName] }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
870 871
        : 'forall' rule_var_list '.'            { $2 }
        | {- empty -}                           { [] }
872 873

rule_var_list :: { [RuleBndr RdrName] }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
874 875
        : rule_var                              { [$1] }
        | rule_var rule_var_list                { $1 : $2 }
876 877

rule_var :: { RuleBndr RdrName }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
878
        : varid                                 { RuleBndr $1 }
879
        | '(' varid '::' ctype ')'              { RuleBndrSig $2 (mkHsBSig $4) }
880 881

-----------------------------------------------------------------------------
Ian Lynagh's avatar
Ian Lynagh committed
882 883 884
-- Warnings and deprecations (c.f. rules)

warnings :: { OrdList (LHsDecl RdrName) }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
885 886 887 888
        : warnings ';' warning          { $1 `appOL` $3 }
        | warnings ';'                  { $1 }
        | warning                               { $1 }
        | {- empty -}                           { nilOL }
Ian Lynagh's avatar
Ian Lynagh committed
889 890 891

-- SUP: TEMPORARY HACK, not checking for `module Foo'
warning :: { OrdList (LHsDecl RdrName) }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
892 893 894
        : namelist strings
                { toOL [ LL $ WarningD (Warning n (WarningTxt $ unLoc $2))
                       | n <- unLoc $1 ] }
895

896
deprecations :: { OrdList (LHsDecl RdrName) }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
897 898 899 900
        : deprecations ';' deprecation          { $1 `appOL` $3 }
        | deprecations ';'                      { $1 }
        | deprecation                           { $1 }
        | {- empty -}                           { nilOL }
901 902

-- SUP: TEMPORARY HACK, not checking for `module Foo'
903
deprecation :: { OrdList (LHsDecl RdrName) }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
904 905 906
        : namelist strings
                { toOL [ LL $ WarningD (Warning n (DeprecatedTxt $ unLoc $2))
                       | n <- unLoc $1 ] }
907

908 909 910 911 912 913 914 915
strings :: { Located [FastString] }
    : STRING { L1 [getSTRING $1] }
    | '[' stringlist ']' { LL $ fromOL (unLoc $2) }

stringlist :: { Located (OrdList FastString) }
    : stringlist ',' STRING { LL (unLoc $1 `snocOL` getSTRING $3) }
    | STRING                { LL (unitOL (getSTRING $1)) }

916 917 918 919 920 921 922
-----------------------------------------------------------------------------
-- Annotations
annotation :: { LHsDecl RdrName }
    : '{-# ANN' name_var aexp '#-}'      { LL (AnnD $ HsAnnotation (ValueAnnProvenance (unLoc $2)) $3) }
    | '{-# ANN' 'type' tycon aexp '#-}'  { LL (AnnD $ HsAnnotation (TypeAnnProvenance (unLoc $3)) $4) }
    | '{-# ANN' 'module' aexp '#-}'      { LL (AnnD $ HsAnnotation ModuleAnnProvenance $3) }

923 924 925 926 927

-----------------------------------------------------------------------------
-- Foreign import and export declarations

fdecl :: { LHsDecl RdrName }
Simon Marlow's avatar
Simon Marlow committed
928
fdecl : 'import' callconv safety fspec
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
929 930 931 932
                {% mkImport $2 $3 (unLoc $4) >>= return.LL }
      | 'import' callconv        fspec          
                {% do { d <- mkImport $2 PlaySafe (unLoc $3);
                        return (LL d) } }
933
      | 'export' callconv fspec
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
934
                {% mkExport $2 (unLoc $3) >>= return.LL }
935

936
callconv :: { CCallConv }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
937 938
          : 'stdcall'                   { StdCallConv }
          | 'ccall'                     { CCallConv   }
939
          | 'capi'                      { CApiConv    }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
940
          | 'prim'                      { PrimCallConv}
941 942

safety :: { Safety }
chak@cse.unsw.edu.au.'s avatar
chak@cse.unsw.edu.au. committed
943 944 945
        : 'unsafe'                      { PlayRisky }
        | 'safe'                        { PlaySafe }
        | 'interruptible'               { PlayInterruptible }
946 947

fspec :: { Located (Located FastString, Located RdrName, LHsType RdrName) }
948 949
       : STRING var '::' sigtypedoc     { LL (L (getLoc $1) (getSTRING $1), $2, $4) }
       |        var '::' sigtypedoc     { LL (noLoc nilFS, $1, $3) }