#include "HsVersions.h"
+import ForeignCall ( Safety(..) )
import ErrUtils ( Message )
import Outputable
import StringBuffer
import DATA_BITS
import Char
import Ratio
---import TRACE
+import TRACE
}
$whitechar = [\ \t\n\r\f\v\xa0]
-- -----------------------------------------------------------------------------
-- The token type
-data Token = T SrcSpan Token__
+data Token = T SrcLoc{-start-} SrcLoc{-end-} Token__
data Token__
= ITas -- Haskell keywords
-- -----------------------------------------------------------------------------
-- Lexer actions
-type Action = SrcSpan -> StringBuffer -> Int -> P Token
+type Action = SrcLoc -> SrcLoc -> StringBuffer -> Int -> P Token
special :: Token__ -> Action
-special tok span _buf len = return (T span tok)
+special tok loc end _buf len = return (T loc end tok)
token, layout_token :: Token__ -> Action
-token t span buf len = return (T span t)
-layout_token t span buf len = pushLexState layout >> return (T span t)
+token t loc end buf len = return (T loc end t)
+layout_token t loc end buf len = pushLexState layout >> return (T loc end t)
idtoken :: (StringBuffer -> Int -> Token__) -> Action
-idtoken f span buf len = return (T span $! (f buf len))
+idtoken f loc end buf len = return (T loc end $! (f buf len))
skip_one_varid :: (FastString -> Token__) -> Action
-skip_one_varid f span buf len
- = return (T span $! f (lexemeToFastString (stepOn buf) (len-1)))
+skip_one_varid f loc end buf len
+ = return (T loc end $! f (lexemeToFastString (stepOn buf) (len-1)))
strtoken :: (String -> Token__) -> Action
-strtoken f span buf len =
- return (T span $! (f $! lexemeToString buf len))
+strtoken f loc end buf len =
+ return (T loc end $! (f $! lexemeToString buf len))
init_strtoken :: Int -> (String -> Token__) -> Action
-- like strtoken, but drops the last N character(s)
-init_strtoken drop f span buf len =
- return (T span $! (f $! lexemeToString buf (len-drop)))
+init_strtoken drop f loc end buf len =
+ return (T loc end $! (f $! lexemeToString buf (len-drop)))
begin :: Int -> Action
-begin code _span _str _len = do pushLexState code; lexToken
+begin code _loc _end _str _len = do pushLexState code; lexToken
pop :: Action
-pop _span _buf _len = do popLexState; lexToken
+pop _loc _end _buf _len = do popLexState; lexToken
pop_and :: Action -> Action
-pop_and act span buf len = do popLexState; act span buf len
+pop_and act loc end buf len = do popLexState; act loc end buf len
notFollowedBy char _ _ _ (_,buf) = atEnd buf || currentChar buf /= char
using regular expressions.
-}
nested_comment :: Action
-nested_comment span _str _len = do
+nested_comment loc _end _str _len = do
input <- getInput
go 1 input
where go 0 input = do setInput input; lexToken
Just (c,input) -> go n input
c -> go n input
- err input = do failLocMsgP (srcSpanStart span) (fst input) "unterminated `{-'"
+ err input = do failLocMsgP loc (fst input) "unterminated `{-'"
open_brace, close_brace :: Action
-open_brace span _str _len = do
+open_brace loc end _str _len = do
ctx <- getContext
setContext (NoLayout:ctx)
- return (T span ITocurly)
-close_brace span _str _len = do
+ return (T loc end ITocurly)
+close_brace loc end _str _len = do
popContext
- return (T span ITccurly)
+ return (T loc end ITccurly)
-- We have to be careful not to count M.<varid> as a qualified name
-- when <varid> is a keyword. We hack around this by catching
-- the offending tokens afterward, and re-lexing in a different state.
-check_qvarid span buf len = do
+check_qvarid loc end buf len = do
case lookupUFM reservedWordsFM var of
Just (keyword,exts)
| not (isSpecial keyword) ->
_other -> return token
where
(mod,var) = splitQualName buf len
- token = T span (ITqvarid (mod,var))
+ token = T loc end (ITqvarid (mod,var))
try_again = do
- setInput (srcSpanStart span,buf)
+ setInput (loc,buf)
pushLexState bad_qvarid
lexToken
(lexemeToFastString orig_buf dot_off,
lexemeToFastString (stepOnBy (dot_off+1) orig_buf) (len - dot_off -1))
-varid span buf len =
+varid loc end buf len =
case lookupUFM reservedWordsFM fs of
Just (keyword,0) -> do
maybe_layout keyword
- return (T span keyword)
+ return (T loc end keyword)
Just (keyword,exts) -> do
b <- extension (\i -> exts .&. i /= 0)
if b then do maybe_layout keyword
- return (T span keyword)
- else return (T span (ITvarid fs))
- _other -> return (T span (ITvarid fs))
+ return (T loc end keyword)
+ else return (T loc end (ITvarid fs))
+ _other -> return (T loc end (ITvarid fs))
where
fs = lexemeToFastString buf len
varsym = sym ITvarsym
consym = sym ITconsym
-sym con span buf len =
+sym con loc end buf len =
case lookupUFM reservedSymsFM fs of
- Just (keyword,0) -> return (T span keyword)
+ Just (keyword,0) -> return (T loc end keyword)
Just (keyword,exts) -> do
b <- extension (\i -> exts .&. i /= 0)
- if b then return (T span keyword)
- else return (T span $! con fs)
- _other -> return (T span $! con fs)
+ if b then return (T loc end keyword)
+ else return (T loc end $! con fs)
+ _other -> return (T loc end $! con fs)
where
fs = lexemeToFastString buf len
-tok_decimal span buf len
- = return (T span (ITinteger $! parseInteger buf len 10 oct_or_dec))
+tok_decimal loc end buf len
+ = return (T loc end (ITinteger $! parseInteger buf len 10 oct_or_dec))
-tok_octal span buf len
- = return (T span (ITinteger $! parseInteger (stepOnBy 2 buf) (len-2) 8 oct_or_dec))
+tok_octal loc end buf len
+ = return (T loc end (ITinteger $! parseInteger (stepOnBy 2 buf) (len-2) 8 oct_or_dec))
-tok_hexadecimal span buf len
- = return (T span (ITinteger $! parseInteger (stepOnBy 2 buf) (len-2) 16 hex))
+tok_hexadecimal loc end buf len
+ = return (T loc end (ITinteger $! parseInteger (stepOnBy 2 buf) (len-2) 16 hex))
-prim_decimal span buf len
- = return (T span (ITprimint $! parseInteger buf (len-1) 10 oct_or_dec))
+prim_decimal loc end buf len
+ = return (T loc end (ITprimint $! parseInteger buf (len-1) 10 oct_or_dec))
-prim_octal span buf len
- = return (T span (ITprimint $! parseInteger (stepOnBy 2 buf) (len-3) 8 oct_or_dec))
+prim_octal loc end buf len
+ = return (T loc end (ITprimint $! parseInteger (stepOnBy 2 buf) (len-3) 8 oct_or_dec))
-prim_hexadecimal span buf len
- = return (T span (ITprimint $! parseInteger (stepOnBy 2 buf) (len-3) 16 hex))
+prim_hexadecimal loc end buf len
+ = return (T loc end (ITprimint $! parseInteger (stepOnBy 2 buf) (len-3) 16 hex))
tok_float str = ITrational $! readRational__ str
prim_float str = ITprimfloat $! readRational__ str
-- we're at the first token on a line, insert layout tokens if necessary
do_bol :: Action
-do_bol span _str _len = do
- pos <- getOffside (srcSpanEndCol span)
+do_bol loc end _str _len = do
+ pos <- getOffside end
case pos of
LT -> do
--trace "layout: inserting '}'" $ do
popContext
-- do NOT pop the lex state, we might have a ';' to insert
- return (T span ITvccurly)
+ return (T loc end ITvccurly)
EQ -> do
--trace "layout: inserting ';'" $ do
popLexState
- return (T span ITsemi)
+ return (T loc end ITsemi)
GT -> do
popLexState
lexToken
-- by a 'do', then we allow the new context to be at the same indentation as
-- the previous context. This is what the 'strict' argument is for.
--
-new_layout_context strict span _buf _len = do
+new_layout_context strict loc end _buf _len = do
popLexState
- let offset = srcSpanStartCol span
+ let offset = srcLocCol loc
ctx <- getContext
case ctx of
Layout prev_off : _ |
-- token is indented to the left of the previous context.
-- we must generate a {} sequence now.
pushLexState layout_left
- return (T span ITvocurly)
+ return (T loc end ITvocurly)
other -> do
setContext (Layout offset : ctx)
- return (T span ITvocurly)
+ return (T loc end ITvocurly)
-do_layout_left span _buf _len = do
+do_layout_left loc end _buf _len = do
popLexState
pushLexState bol -- we must be at the start of a line
- return (T span ITvccurly)
+ return (T loc end ITvccurly)
-- -----------------------------------------------------------------------------
-- LINE pragmas
set_line :: Int -> Action
-set_line code span buf len = do
+set_line code loc end buf len = do
let line = parseInteger buf len 10 oct_or_dec
- setSrcLoc (mkSrcLoc (srcSpanFile span) (fromIntegral line - 1) 0)
+ setSrcLoc (mkSrcLoc (srcLocFile end) (fromIntegral line - 1) 0)
-- subtract one: the line number refers to the *following* line
popLexState
pushLexState code
lexToken
set_file :: Int -> Action
-set_file code span buf len = do
+set_file code loc end buf len = do
let file = lexemeToFastString (stepOn buf) (len-2)
- setSrcLoc (mkSrcLoc file (srcSpanEndLine span) (srcSpanEndCol span))
+ setSrcLoc (mkSrcLoc file (srcLocLine end) (srcLocCol end))
popLexState
pushLexState code
lexToken
-- This stuff is horrible. I hates it.
lex_string_tok :: Action
-lex_string_tok span buf len = do
+lex_string_tok loc end buf len = do
tok <- lex_string ""
end <- getSrcLoc
- return (T (mkSrcSpan (srcSpanStart span) end) tok)
+ return (T loc end tok)
lex_string :: String -> P Token__
lex_string s = do
c <- lex_char
lex_string (c:s)
+lex_char :: P Char
+lex_char = do
+ mc <- getCharOrFail
+ case mc of
+ '\\' -> lex_escape
+ c | is_any c -> return c
+ _other -> lit_error
+
lex_stringgap s = do
c <- getCharOrFail
case c of
-- but WIHTOUT 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 '
+lex_char_tok loc _end buf len = do -- We've seen '
i1 <- getInput -- Look ahead to first character
- let loc = srcSpanStart span
case alexGetChar i1 of
Nothing -> lit_error
th_exts <- extension thEnabled
if th_exts then do
setInput i2
- return (T (mkSrcSpan loc end2) ITtyQuote)
+ return (T loc end2 ITtyQuote)
else lit_error
Just ('\\', i2@(end2,_)) -> do -- We've seen 'backslash
_other -> do -- We've seen 'x not followed by quote
-- If TH is on, just parse the quote only
th_exts <- extension thEnabled
- if th_exts then return (T (mkSrcSpan loc (fst i1)) ITvarQuote)
+ if th_exts then return (T loc (fst i1) ITvarQuote)
else lit_error
finish_char_tok :: SrcLoc -> Char -> P Token
case alexGetChar i of
Just ('#',i@(end,_)) -> do
setInput i
- return (T (mkSrcSpan loc end) (ITprimchar ch))
+ return (T loc end (ITprimchar ch))
_other ->
- return (T (mkSrcSpan loc end) (ITchar ch))
- else do
- end <- getSrcLoc
- return (T (mkSrcSpan loc end) (ITchar ch))
-
-lex_char :: P Char
-lex_char = do
- mc <- getCharOrFail
- case mc of
- '\\' -> lex_escape
- c | is_any c -> return c
- _other -> lit_error
+ return (T loc end (ITchar ch))
+ else do end <- getSrcLoc
+ return (T loc end (ITchar ch))
lex_escape :: P Char
lex_escape = do
data ParseResult a
= POk PState a
| PFailed
- SrcSpan -- The spam the error. Might be used in environments
- -- which can show this span, e.g. by highlighting it.
+ SrcLoc SrcLoc -- The start and end of the text span related to
+ -- the error. Might be used in environments which can
+ -- show this span, e.g. by highlighting it.
Message -- The error message
-showPFailed span err = hcat [ppr span, text ": ", err]
+showPFailed loc1 loc2 err = hcat [ppr loc1, text ": ", err]
data PState = PState {
buffer :: StringBuffer,
- last_span :: SrcSpan, -- span of previous token
- last_len :: !Int,
+ last_loc :: SrcLoc, -- pos of previous token
+ last_len :: !Int, -- len of previous token
loc :: SrcLoc, -- current loc (end of prev token + 1)
extsBitmap :: !Int, -- bitmap that determines permitted extensions
context :: [LayoutContext],
lex_state :: [Int]
}
- -- last_span is used when generating error messages,
+ -- last_loc and last_len are used when generating error messages,
-- and in pushCurrentContext only.
- -- last_len is used when generating error messages, and is
- -- needed because we need to back up the buffer pointer by that
- -- number of characters for outputing the token in the error message.
newtype P a = P { unP :: PState -> ParseResult a }
thenP :: P a -> (a -> P b) -> P b
(P m) `thenP` k = P $ \ s ->
case m s of
- POk s1 a -> (unP (k a)) s1
- PFailed span err -> PFailed span err
+ POk s1 a -> (unP (k a)) s1
+ PFailed l1 l2 err -> PFailed l1 l2 err
failP :: String -> P a
-failP msg = P $ \s -> PFailed (last_span s) (text msg)
+failP msg = P $ \s -> PFailed (last_loc s) (loc s) (text msg)
failMsgP :: String -> P a
-failMsgP msg = P $ \s -> PFailed (last_span s) (text msg)
+failMsgP msg = P $ \s -> PFailed (last_loc s) (loc s) (text msg)
failLocMsgP :: SrcLoc -> SrcLoc -> String -> P a
-failLocMsgP loc1 loc2 str = P $ \s -> PFailed (mkSrcSpan loc1 loc2) (text str)
+failLocMsgP loc1 loc2 str = P $ \s -> PFailed loc1 loc2 (text str)
extension :: (Int -> Bool) -> P Bool
extension p = P $ \s -> POk s (p $! extsBitmap s)
setSrcLocFor :: SrcLoc -> P a -> P a
setSrcLocFor new_loc scope = P $ \s@PState{ loc = old_loc } ->
case unP scope s{loc=new_loc} of
- PFailed span msg -> PFailed span msg
+ PFailed l1 l2 msg -> PFailed l1 l2 msg
POk _ r -> POk s r
getSrcLoc :: P SrcLoc
getSrcLoc = P $ \s@(PState{ loc=loc }) -> POk s loc
-setLastToken :: SrcSpan -> Int -> P ()
-setLastToken span len = P $ \s -> POk s{ last_span=span, last_len=len } ()
+setLastToken :: SrcLoc -> Int -> P ()
+setLastToken loc len = P $ \s -> POk s{ last_loc=loc, last_len=len } ()
type AlexInput = (SrcLoc,StringBuffer)
mkPState buf loc flags =
PState {
buffer = buf,
- last_span = mkSrcSpan loc loc,
+ last_loc = loc,
last_len = 0,
loc = loc,
extsBitmap = fromIntegral bitmap,
popContext :: P ()
popContext = P $ \ s@(PState{ buffer = buf, context = ctx,
- loc = loc, last_len = len, last_span = last_span }) ->
+ loc = loc, last_len = len, last_loc = last_loc }) ->
case ctx of
(_:tl) -> POk s{ context = tl } ()
- [] -> PFailed last_span (srcParseErr buf len)
+ [] -> PFailed last_loc loc (srcParseErr buf len)
-- Push a new layout context at the indentation of the last token read.
-- This is only used at the outer level of a module when the 'module'
-- keyword is missing.
pushCurrentContext :: P ()
-pushCurrentContext = P $ \ s@PState{ last_span=span, context=ctx } ->
- POk s{ context = Layout (srcSpanStartCol span) : ctx} ()
+pushCurrentContext = P $ \ s@PState{ last_loc=loc, context=ctx } ->
+ POk s{ context = Layout (srcLocCol loc) : ctx} ()
-getOffside :: Int -> P Ordering
-getOffside col = P $ \s@PState{context=stk} ->
+getOffside :: SrcLoc -> P Ordering
+getOffside loc = P $ \s@PState{context=stk} ->
let ord = case stk of
- (Layout n:_) -> compare col n
+ (Layout n:_) -> compare (srcLocCol loc) n
_ -> GT
- in POk s $! ord
+ in POk s ord
-- ---------------------------------------------------------------------------
-- Construct a parse error
-- detected during parsing.
srcParseFail :: P a
srcParseFail = P $ \PState{ buffer = buf, last_len = len,
- last_span = last_span, loc = loc } ->
- PFailed last_span (srcParseErr buf len)
+ last_loc = last_loc, loc = loc } ->
+ PFailed last_loc loc (srcParseErr buf len)
-- A lexical error is reported at a particular position in the source file,
-- not over a token range. TODO: this is slightly wrong, because we record
lexer :: (Token -> P a) -> P a
lexer cont = do
- tok@(T _ tok__) <- lexToken
+ tok@(T _ _ tok__) <- lexToken
--trace ("token: " ++ show tok__) $ do
cont tok
sc <- getLexState
exts <- getExts
case alexScanUser exts inp sc of
- AlexEOF -> do let span = mkSrcSpan loc1 loc1
- setLastToken span 0
- return (T span ITeof)
+ AlexEOF -> do setLastToken loc1 0
+ return (T loc1 loc1 ITeof)
AlexError (loc2,_) -> do failLocMsgP loc1 loc2 "lexical error"
AlexSkip inp2 _ -> do
setInput inp2
lexToken
AlexToken inp2@(end,buf2) len t -> do
setInput inp2
- let span = mkSrcSpan loc1 end
- (setLastToken $! span) $! len
- t span buf len
+ setLastToken loc1 len
+ t loc1 end buf len
}
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