{
{-# OPTIONS -Wwarn -w #-}
--- The above warning supression flag is a temporary kludge.
+-- The above -Wwarn 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
module Lexer (
Token(..), lexer, pragState, mkPState, PState(..),
P(..), ParseResult(..), getSrcLoc,
+ getPState, getDynFlags, withThisPackage,
failLocMsgP, failSpanMsgP, srcParseFail,
- getMessages,
+ getMessages,
popContext, pushCurrentContext, setLastToken, setSrcLoc,
getLexState, popLexState, pushLexState,
extension, standaloneDerivingEnabled, bangPatEnabled,
import Bag
import ErrUtils
-import Maybe
import Outputable
import StringBuffer
import FastString
import SrcLoc
import UniqFM
import DynFlags
+import Module
import Ctype
-import Util ( maybePrefixMatch, readRational )
+import Util ( readRational )
import Control.Monad
import Data.Bits
import Data.Char
import Data.List
+import Data.Maybe
import Data.Map (Map)
import qualified Data.Map as Map
import Data.Ratio
<0,option_prags> \n { begin bol }
-"{-#" $whitechar* (line|LINE) / { notFollowedByPragmaChar }
- { begin line_prag2 }
+"{-#" $whitechar* $pragmachar+ / { known_pragma linePrags }
+ { dispatch_pragmas linePrags }
-- single-line line pragmas, of the form
-- # <line> "<file>" <extra-stuff> \n
| ITstdcallconv
| ITccallconv
| ITprimcallconv
- | ITdotnet
| ITmdo
| ITfamily
| ITgroup
| ITdupipvarid FastString -- GHC extension: implicit param: ?x
- | ITpragma StringBuffer
-
| ITchar Char
| ITstring FastString
| ITinteger Integer
| ITprimfloat Rational
| ITprimdouble Rational
- -- MetaHaskell extension tokens
+ -- Template Haskell extension tokens
| ITopenExpQuote -- [| or [e|
| ITopenPatQuote -- [p|
| ITopenDecQuote -- [d|
( "stdcall", ITstdcallconv, bit ffiBit),
( "ccall", ITccallconv, bit ffiBit),
( "prim", ITprimcallconv, bit ffiBit),
- ( "dotnet", ITdotnet, bit ffiBit),
- ( "rec", ITrec, bit arrowsBit),
+ ( "rec", ITrec, bit recBit),
( "proc", ITproc, bit arrowsBit)
]
begin code _span _str _len = do pushLexState code; lexToken
pop :: Action
-pop _span _buf _len = do popLexState; lexToken
+pop _span _buf _len = do _ <- popLexState
+ lexToken
pop_and :: Action -> Action
-pop_and act span buf len = do popLexState; act span buf len
+pop_and act span buf len = do _ <- popLexState
+ act span buf len
{-# INLINE nextCharIs #-}
nextCharIs :: StringBuffer -> (Char -> Bool) -> Bool
notFollowedBySymbol _ _ _ (AI _ _ buf)
= nextCharIs buf (`notElem` "!#$%&*+./<=>?@\\^|-~")
-notFollowedByPragmaChar :: AlexAccPred Int
-notFollowedByPragmaChar _ _ _ (AI _ _ buf)
- = nextCharIs buf (\c -> not (isAlphaNum c || c == '_'))
-
-- We must reject doc comments as being ordinary comments everywhere.
-- In some cases the doc comment will be selected as the lexeme due to
-- maximal munch, but not always, because the nested comment rule is
-- RULES pragmas turn on the forall and '.' keywords, and we turn them
-- off again at the end of the pragma.
rulePrag :: Action
-rulePrag span _ _ = do
+rulePrag span _buf _len = do
setExts (.|. bit inRulePragBit)
return (L span ITrules_prag)
endPrag :: Action
-endPrag span _ _ = do
+endPrag span _buf _len = do
setExts (.&. complement (bit inRulePragBit))
return (L span ITclose_prag)
return (L span ITvccurly)
EQ -> do
--trace "layout: inserting ';'" $ do
- popLexState
+ _ <- popLexState
return (L span ITsemi)
GT -> do
- popLexState
+ _ <- popLexState
lexToken
-- certain keywords put us in the "layout" state, where we might
--
new_layout_context :: Bool -> Action
new_layout_context strict span _buf _len = do
- popLexState
+ _ <- popLexState
(AI _ offset _) <- getInput
ctx <- getContext
case ctx of
do_layout_left :: Action
do_layout_left span _buf _len = do
- popLexState
+ _ <- popLexState
pushLexState bol -- we must be at the start of a line
return (L span ITvccurly)
let line = parseUnsignedInteger buf len 10 octDecDigit
setSrcLoc (mkSrcLoc (srcSpanFile span) (fromIntegral line - 1) 0)
-- subtract one: the line number refers to the *following* line
- popLexState
+ _ <- popLexState
pushLexState code
lexToken
setFile code span buf len = do
let file = lexemeToFastString (stepOn buf) (len-2)
setSrcLoc (mkSrcLoc file (srcSpanEndLine span) (srcSpanEndCol span))
- popLexState
+ _ <- popLexState
pushLexState code
lexToken
-- Here we are basically parsing character literals, such as 'x' or '\n'
-- but, when Template Haskell is on, we additionally spot
-- 'x and ''T, returning ITvarQuote and ITtyQuote respectively,
--- but WIHTOUT CONSUMING the x or T part (the parser does that).
+-- but WITHOUT CONSUMING the x or T part (the parser does that).
-- So we have to do two characters of lookahead: when we see 'x we need to
-- see if there's a trailing quote
lex_char_tok span _buf _len = do -- We've seen '
Just (c3,i3) ->
let str = [c1,c2,c3] in
case [ (c,rest) | (p,c) <- silly_escape_chars,
- Just rest <- [maybePrefixMatch p str] ] of
+ Just rest <- [stripPrefix p str] ] of
(escape_char,[]):_ -> do
setInput i3
return escape_char
failSpanMsgP :: SrcSpan -> SDoc -> P a
failSpanMsgP span msg = P $ \_ -> PFailed span msg
+getPState :: P PState
+getPState = P $ \s -> POk s s
+
+getDynFlags :: P DynFlags
+getDynFlags = P $ \s -> POk s (dflags s)
+
+withThisPackage :: (PackageId -> a) -> P a
+withThisPackage f
+ = do pkg <- liftM thisPackage getDynFlags
+ return $ f pkg
+
extension :: (Int -> Bool) -> P Bool
extension p = P $ \s -> POk s (p $! extsBitmap s)
rawTokenStreamBit = 20 -- producing a token stream with all comments included
newQualOpsBit :: Int
newQualOpsBit = 21 -- Haskell' qualified operator syntax, e.g. Prelude.(+)
+recBit :: Int
+recBit = 22 -- rec
always :: Int -> Bool
always _ = True
}
where
bitmap = genericsBit `setBitIf` dopt Opt_Generics flags
- .|. ffiBit `setBitIf` dopt Opt_ForeignFunctionInterface flags
- .|. parrBit `setBitIf` dopt Opt_PArr flags
- .|. arrowsBit `setBitIf` dopt Opt_Arrows flags
- .|. thBit `setBitIf` dopt Opt_TemplateHaskell flags
- .|. qqBit `setBitIf` dopt Opt_QuasiQuotes flags
- .|. ipBit `setBitIf` dopt Opt_ImplicitParams flags
- .|. explicitForallBit `setBitIf` dopt Opt_ScopedTypeVariables flags
- .|. explicitForallBit `setBitIf` dopt Opt_LiberalTypeSynonyms flags
- .|. explicitForallBit `setBitIf` dopt Opt_PolymorphicComponents flags
- .|. explicitForallBit `setBitIf` dopt Opt_ExistentialQuantification flags
- .|. explicitForallBit `setBitIf` dopt Opt_Rank2Types flags
- .|. explicitForallBit `setBitIf` dopt Opt_RankNTypes flags
- .|. bangPatBit `setBitIf` dopt Opt_BangPatterns flags
- .|. tyFamBit `setBitIf` dopt Opt_TypeFamilies flags
- .|. haddockBit `setBitIf` dopt Opt_Haddock flags
- .|. magicHashBit `setBitIf` dopt Opt_MagicHash flags
- .|. kindSigsBit `setBitIf` dopt Opt_KindSignatures flags
- .|. recursiveDoBit `setBitIf` dopt Opt_RecursiveDo flags
- .|. unicodeSyntaxBit `setBitIf` dopt Opt_UnicodeSyntax flags
- .|. unboxedTuplesBit `setBitIf` dopt Opt_UnboxedTuples flags
+ .|. ffiBit `setBitIf` dopt Opt_ForeignFunctionInterface flags
+ .|. parrBit `setBitIf` dopt Opt_PArr flags
+ .|. arrowsBit `setBitIf` dopt Opt_Arrows flags
+ .|. thBit `setBitIf` dopt Opt_TemplateHaskell flags
+ .|. qqBit `setBitIf` dopt Opt_QuasiQuotes flags
+ .|. ipBit `setBitIf` dopt Opt_ImplicitParams flags
+ .|. explicitForallBit `setBitIf` dopt Opt_ExplicitForAll flags
+ .|. bangPatBit `setBitIf` dopt Opt_BangPatterns flags
+ .|. tyFamBit `setBitIf` dopt Opt_TypeFamilies flags
+ .|. haddockBit `setBitIf` dopt Opt_Haddock flags
+ .|. magicHashBit `setBitIf` dopt Opt_MagicHash flags
+ .|. kindSigsBit `setBitIf` dopt Opt_KindSignatures flags
+ .|. recursiveDoBit `setBitIf` dopt Opt_RecursiveDo flags
+ .|. recBit `setBitIf` dopt Opt_DoRec flags
+ .|. recBit `setBitIf` dopt Opt_Arrows flags
+ .|. unicodeSyntaxBit `setBitIf` dopt Opt_UnicodeSyntax flags
+ .|. unboxedTuplesBit `setBitIf` dopt Opt_UnboxedTuples flags
.|. standaloneDerivingBit `setBitIf` dopt Opt_StandaloneDeriving flags
.|. transformComprehensionsBit `setBitIf` dopt Opt_TransformListComp flags
.|. rawTokenStreamBit `setBitIf` dopt Opt_KeepRawTokenStream flags
L _ ITeof -> return []
_ -> liftM (ltok:) go
+linePrags = Map.singleton "line" (begin line_prag2)
+
fileHeaderPrags = Map.fromList([("options", lex_string_prag IToptions_prag),
("options_ghc", lex_string_prag IToptions_prag),
("options_haddock", lex_string_prag ITdocOptions),
Nothing -> lexError "unknown pragma"
known_pragma :: Map String Action -> AlexAccPred Int
-known_pragma prags q r len (AI s t buf) = (isJust $ Map.lookup (clean_pragma (lexemeToString (offsetBytes (- len) buf) len)) prags)
- && (notFollowedByPragmaChar q r len (AI s t buf))
+known_pragma prags _ _ len (AI _ _ buf) = (isJust $ Map.lookup (clean_pragma (lexemeToString (offsetBytes (- len) buf) len)) prags)
+ && (nextCharIs buf (\c -> not (isAlphaNum c || c == '_')))
clean_pragma :: String -> String
clean_pragma prag = canon_ws (map toLower (unprefix prag))
- where unprefix prag' = (case stripPrefix "{-#" prag' of
- Just rest -> rest
- Nothing -> prag')
+ where unprefix prag' = case stripPrefix "{-#" prag' of
+ Just rest -> rest
+ Nothing -> prag'
canonical prag' = case prag' of
"noinline" -> "notinline"
"specialise" -> "specialize"
"constructorlike" -> "conlike"
- otherwise -> prag'
+ _ -> prag'
canon_ws s = unwords (map canonical (words s))
}
projects / ghc-hetmet.git / blobdiff