forked from tromp/hs2blc
/
Lexer.hs
513 lines (390 loc) · 42.1 KB
/
Lexer.hs
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{-# LANGUAGE CPP #-}
{-# LINE 2 "Lexer.x" #-}
module Lexer where
import Numeric (readOct, readHex)
import Data.Char (isUpper, isLower)
import qualified Text.ParserCombinators.Parsec.Pos as Pos
#if __GLASGOW_HASKELL__ >= 603
#include "ghcconfig.h"
#elif defined(__GLASGOW_HASKELL__)
#include "config.h"
#endif
#if __GLASGOW_HASKELL__ >= 503
import Data.Array
import Data.Char (ord)
import Data.Array.Base (unsafeAt)
#else
import Array
import Char (ord)
#endif
{-# LINE 1 "templates/wrappers.hs" #-}
{-# LINE 1 "templates/wrappers.hs" #-}
{-# LINE 1 "<built-in>" #-}
{-# LINE 1 "<command-line>" #-}
{-# LINE 1 "templates/wrappers.hs" #-}
-- -----------------------------------------------------------------------------
-- Alex wrapper code.
--
-- This code is in the PUBLIC DOMAIN; you may copy it freely and use
-- it for any purpose whatsoever.
import Data.Word (Word8)
{-# LINE 22 "templates/wrappers.hs" #-}
import qualified Data.Bits
-- | Encode a Haskell String to a list of Word8 values, in UTF8 format.
utf8Encode :: Char -> [Word8]
utf8Encode = map fromIntegral . go . ord
where
go oc
| oc <= 0x7f = [oc]
| oc <= 0x7ff = [ 0xc0 + (oc `Data.Bits.shiftR` 6)
, 0x80 + oc Data.Bits..&. 0x3f
]
| oc <= 0xffff = [ 0xe0 + (oc `Data.Bits.shiftR` 12)
, 0x80 + ((oc `Data.Bits.shiftR` 6) Data.Bits..&. 0x3f)
, 0x80 + oc Data.Bits..&. 0x3f
]
| otherwise = [ 0xf0 + (oc `Data.Bits.shiftR` 18)
, 0x80 + ((oc `Data.Bits.shiftR` 12) Data.Bits..&. 0x3f)
, 0x80 + ((oc `Data.Bits.shiftR` 6) Data.Bits..&. 0x3f)
, 0x80 + oc Data.Bits..&. 0x3f
]
type Byte = Word8
-- -----------------------------------------------------------------------------
-- The input type
type AlexInput = (AlexPosn, -- current position,
Char, -- previous char
[Byte], -- pending bytes on current char
String) -- current input string
ignorePendingBytes (p,c,ps,s) = (p,c,s)
alexInputPrevChar :: AlexInput -> Char
alexInputPrevChar (p,c,bs,s) = c
alexGetByte :: AlexInput -> Maybe (Byte,AlexInput)
alexGetByte (p,c,(b:bs),s) = Just (b,(p,c,bs,s))
alexGetByte (p,c,[],[]) = Nothing
alexGetByte (p,_,[],(c:s)) = let p' = alexMove p c
(b:bs) = utf8Encode c
in p' `seq` Just (b, (p', c, bs, s))
{-# LINE 88 "templates/wrappers.hs" #-}
{-# LINE 102 "templates/wrappers.hs" #-}
{-# LINE 117 "templates/wrappers.hs" #-}
-- -----------------------------------------------------------------------------
-- Token positions
-- `Posn' records the location of a token in the input text. It has three
-- fields: the address (number of chacaters preceding the token), line number
-- and column of a token within the file. `start_pos' gives the position of the
-- start of the file and `eof_pos' a standard encoding for the end of file.
-- `move_pos' calculates the new position after traversing a given character,
-- assuming the usual eight character tab stops.
data AlexPosn = AlexPn !Int !Int !Int
deriving (Eq,Show)
alexStartPos :: AlexPosn
alexStartPos = AlexPn 0 1 1
alexMove :: AlexPosn -> Char -> AlexPosn
alexMove (AlexPn a l c) '\t' = AlexPn (a+1) l (((c+7) `div` 8)*8+1)
alexMove (AlexPn a l c) '\n' = AlexPn (a+1) (l+1) 1
alexMove (AlexPn a l c) _ = AlexPn (a+1) l (c+1)
-- -----------------------------------------------------------------------------
-- Default monad
{-# LINE 230 "templates/wrappers.hs" #-}
-- -----------------------------------------------------------------------------
-- Monad (with ByteString input)
{-# LINE 319 "templates/wrappers.hs" #-}
-- -----------------------------------------------------------------------------
-- Basic wrapper
{-# LINE 345 "templates/wrappers.hs" #-}
-- -----------------------------------------------------------------------------
-- Basic wrapper, ByteString version
{-# LINE 363 "templates/wrappers.hs" #-}
{-# LINE 376 "templates/wrappers.hs" #-}
-- -----------------------------------------------------------------------------
-- Posn wrapper
-- Adds text positions to the basic model.
--alexScanTokens :: String -> [token]
alexScanTokens str = go (alexStartPos,'\n',[],str)
where go inp@(pos,_,_,str) =
case alexScan inp 0 of
AlexEOF -> []
AlexError ((AlexPn _ line column),_,_,_) -> error $ "lexical error at " ++ (show line) ++ " line, " ++ (show column) ++ " column"
AlexSkip inp' len -> go inp'
AlexToken inp' len act -> act pos (take len str) : go inp'
-- -----------------------------------------------------------------------------
-- Posn wrapper, ByteString version
{-# LINE 408 "templates/wrappers.hs" #-}
-- -----------------------------------------------------------------------------
-- GScan wrapper
-- For compatibility with previous versions of Alex, and because we can.
alex_base :: Array Int Int
alex_base = listArray (0,62) [-8,76,-33,80,99,204,415,543,671,799,927,1055,1183,1296,0,1424,0,1537,0,1650,0,270,0,1715,0,1780,2036,1972,0,0,2085,2341,2460,2465,2392,0,2648,2742,2829,2765,0,0,2883,3107,3187,-41,3352,3288,0,113,3534,3745,-30,0,2453,109,-32,3497,0,0,3535,3968,4001]
alex_table :: Array Int Int
alex_table = listArray (0,4256) 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alex_check :: Array Int Int
alex_check = listArray (0,4256) 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alex_deflt :: Array Int Int
alex_deflt = listArray (0,62) [-1,6,-1,-1,-1,-1,6,-1,-1,-1,-1,-1,-1,20,20,-1,22,22,24,24,28,28,35,35,40,40,6,6,6,41,41,43,-1,-1,43,43,2,-1,-1,2,2,48,48,-1,-1,-1,50,50,50,-1,50,6,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1]
alex_accept = listArray (0::Int,62) [[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[(AlexAccSkip)],[(AlexAccSkip)],[(AlexAccSkip)],[(AlexAcc (alex_action_3))],[(AlexAcc (alex_action_3))],[(AlexAcc (alex_action_4))],[(AlexAcc (alex_action_4))],[(AlexAcc (alex_action_5))],[(AlexAcc (alex_action_6))],[(AlexAcc (alex_action_7))],[(AlexAcc (alex_action_8))],[(AlexAcc (alex_action_9))],[(AlexAcc (alex_action_10))],[(AlexAcc (alex_action_10))]]
{-# LINE 33 "Lexer.x" #-}
single = mtk (single' . head)
dec = mtk (TokenInt . read)
oct = mtk (TokenInt . fst . head . readOct . drop 2)
hex = mtk (TokenInt . fst . head . readHex . drop 2)
ch = mtk (TokenChar . unescapeLit)
str = mtk (TokenStr . unescapeLit)
ide = mtk ide'
sym = mtk sym'
unescapeLit = unescape . init . tail
unescape [] = []
unescape ('\\':'a':cs) = '\a' : unescape cs
unescape ('\\':'b':cs) = '\b' : unescape cs
unescape ('\\':'f':cs) = '\f' : unescape cs
unescape ('\\':'n':cs) = '\n' : unescape cs
unescape ('\\':'r':cs) = '\r' : unescape cs
unescape ('\\':'t':cs) = '\t' : unescape cs
unescape ('\\':'v':cs) = '\v' : unescape cs
unescape ('\\':c:cs) = c : unescape cs
unescape (c:cs) = c : unescape cs
single' '(' = TokenLParen
single' ')' = TokenRParen
single' '{' = TokenLBrace
single' '}' = TokenRBrace
single' '[' = TokenLBracket
single' ']' = TokenRBracket
single' ',' = TokenComma
single' ';' = TokenSemicolon
single' '_' = TokenWildcard
ide' "if" = TokenIf
ide' "then" = TokenThen
ide' "else" = TokenElse
ide' "let" = TokenLet
ide' "in" = TokenIn
ide' "case" = TokenCase
ide' "of" = TokenOf
ide' "do" = TokenDo
ide' "data" = TokenData
ide' "type" = TokenType
ide' "class" = TokenClass
ide' "instance" = TokenInstance
ide' "where" = TokenWhere
ide' s@(c:_)
| isUpper c = TokenConId s
| isLower c = TokenId s
ide' s = error ("unknown token " ++ s)
sym' ".." = TokenDotDot
sym' "::" = TokenCoco
sym' "=" = TokenEq
sym' "\\" = TokenLambda
sym' "|" = TokenBar
sym' "<-" = TokenLArrow
sym' "->" = TokenRArrow
sym' "@" = TokenAt
sym' "~" = TokenTilde
sym' "=>" = TokenImply
sym' s@(':':_) = TokenConOp s
sym' s = TokenOp s
mtk :: (String -> Token) -> AlexPosn -> String -> (Token, AlexPosn)
mtk f p s = (f s, p)
data Token = TokenId String
| TokenConId String
| TokenChar String
| TokenStr String
| TokenInt Int
| TokenIf
| TokenThen
| TokenElse
| TokenLet
| TokenIn
| TokenCase
| TokenOf
| TokenDo
| TokenData
| TokenType
| TokenClass
| TokenInstance
| TokenWhere
| TokenDotDot
| TokenCoco
| TokenEq
| TokenLambda
| TokenBar
| TokenLArrow
| TokenRArrow
| TokenAt
| TokenTilde
| TokenImply
| TokenLParen
| TokenRParen
| TokenLBrace
| TokenRBrace
| TokenLBracket
| TokenRBracket
| TokenComma
| TokenSemicolon
| TokenWildcard
| TokenOp String
| TokenConOp String
deriving (Show, Eq)
lexer :: String -> String -> [(Token, Pos.SourcePos)]
lexer fname = map parsecToken . layout . annotate . alexScanTokens
where parsecToken (tok, AlexPn _ ln col) = (tok, Pos.newPos fname ln col)
lexer' :: String -> String -> [(Token, Pos.SourcePos)]
lexer' fname = map parsecToken . alexScanTokens
where parsecToken (tok, AlexPn _ ln col) = (tok, Pos.newPos fname ln col)
data AnToken = Layout Int
| Indent Int
| Token (Token, AlexPosn)
annotate :: [(Token, AlexPosn)] -> [AnToken]
annotate tps = annotate2 0 tps
annotate1 :: Int -> [(Token, AlexPosn)] -> [AnToken]
annotate1 line [] = []
annotate1 line (t@(tok, AlexPn _ ln col) : tps)
| line < ln = Indent col : rest
| otherwise = rest
where rest = Token t : (next tok) ln tps
next TokenLet = annotate2
next TokenWhere = annotate2
next TokenOf = annotate2
next _ = annotate1
annotate2 :: Int -> [(Token, AlexPosn)] -> [AnToken]
annotate2 line tps@((TokenLBrace, _):_) = annotate1 line tps
annotate2 line tps@((_, AlexPn _ ln col):_) = Layout col : annotate1 ln tps
layout :: [AnToken] -> [(Token, AlexPosn)]
layout ts = layout' ts []
nullPosn :: AlexPosn
nullPosn = AlexPn 0 0 0
layout' :: [AnToken] -> [Int] -> [(Token, AlexPosn)]
layout' ts@(Indent n : ts') ms@(m:ms')
| n == m = (TokenSemicolon, nullPosn) : layout' ts' ms
| n < m = (TokenRBrace, nullPosn) : layout' ts ms'
layout' (Indent n : ts) ms = layout' ts ms
layout' (Layout n : ts) ms@(m:_)
| n > m = (TokenLBrace, nullPosn) : layout' ts (n:ms)
| otherwise = (TokenLBrace, nullPosn)
: (TokenRBrace, nullPosn)
: layout' (Indent n : ts) ms
layout' (Layout n : ts) [] = (TokenLBrace, nullPosn) : layout' ts [n]
layout' (Token t@(TokenRBrace, _) : ts) (0:ms) = t : layout' ts ms
layout' (Token (TokenRBrace, _) : ts) ms = error "parse-error: `}' expected"
layout' (Token t@(TokenLBrace, _) : ts) ms = t : layout' ts (0:ms)
layout' (Token t : ts) ms = t : layout' ts ms
layout' [] [] = []
layout' [] (m:ms) = (TokenRBrace, nullPosn) : layout' [] ms
alex_action_3 = single
alex_action_4 = dec
alex_action_5 = oct
alex_action_6 = hex
alex_action_7 = ch
alex_action_8 = str
alex_action_9 = ide
alex_action_10 = sym
{-# LINE 1 "templates/GenericTemplate.hs" #-}
{-# LINE 1 "templates/GenericTemplate.hs" #-}
{-# LINE 1 "<built-in>" #-}
{-# LINE 1 "<command-line>" #-}
{-# LINE 1 "templates/GenericTemplate.hs" #-}
-- -----------------------------------------------------------------------------
-- ALEX TEMPLATE
--
-- This code is in the PUBLIC DOMAIN; you may copy it freely and use
-- it for any purpose whatsoever.
-- -----------------------------------------------------------------------------
-- INTERNALS and main scanner engine
{-# LINE 37 "templates/GenericTemplate.hs" #-}
{-# LINE 47 "templates/GenericTemplate.hs" #-}
{-# LINE 68 "templates/GenericTemplate.hs" #-}
alexIndexInt16OffAddr arr off = arr ! off
{-# LINE 89 "templates/GenericTemplate.hs" #-}
alexIndexInt32OffAddr arr off = arr ! off
{-# LINE 100 "templates/GenericTemplate.hs" #-}
quickIndex arr i = arr ! i
-- -----------------------------------------------------------------------------
-- Main lexing routines
data AlexReturn a
= AlexEOF
| AlexError !AlexInput
| AlexSkip !AlexInput !Int
| AlexToken !AlexInput !Int a
-- alexScan :: AlexInput -> StartCode -> AlexReturn a
alexScan input (sc)
= alexScanUser undefined input (sc)
alexScanUser user input (sc)
= case alex_scan_tkn user input (0) input sc AlexNone of
(AlexNone, input') ->
case alexGetByte input of
Nothing ->
AlexEOF
Just _ ->
AlexError input'
(AlexLastSkip input'' len, _) ->
AlexSkip input'' len
(AlexLastAcc k input''' len, _) ->
AlexToken input''' len k
-- Push the input through the DFA, remembering the most recent accepting
-- state it encountered.
alex_scan_tkn user orig_input len input s last_acc =
input `seq` -- strict in the input
let
new_acc = (check_accs (alex_accept `quickIndex` (s)))
in
new_acc `seq`
case alexGetByte input of
Nothing -> (new_acc, input)
Just (c, new_input) ->
let
(base) = alexIndexInt32OffAddr alex_base s
((ord_c)) = fromIntegral c
(offset) = (base + ord_c)
(check) = alexIndexInt16OffAddr alex_check offset
(new_s) = if (offset >= (0)) && (check == ord_c)
then alexIndexInt16OffAddr alex_table offset
else alexIndexInt16OffAddr alex_deflt s
in
case new_s of
(-1) -> (new_acc, input)
-- on an error, we want to keep the input *before* the
-- character that failed, not after.
_ -> alex_scan_tkn user orig_input (if c < 0x80 || c >= 0xC0 then (len + (1)) else len)
-- note that the length is increased ONLY if this is the 1st byte in a char encoding)
new_input new_s new_acc
where
check_accs [] = last_acc
check_accs (AlexAcc a : _) = AlexLastAcc a input (len)
check_accs (AlexAccSkip : _) = AlexLastSkip input (len)
check_accs (AlexAccPred a predx : rest)
| predx user orig_input (len) input
= AlexLastAcc a input (len)
check_accs (AlexAccSkipPred predx : rest)
| predx user orig_input (len) input
= AlexLastSkip input (len)
check_accs (_ : rest) = check_accs rest
data AlexLastAcc a
= AlexNone
| AlexLastAcc a !AlexInput !Int
| AlexLastSkip !AlexInput !Int
instance Functor AlexLastAcc where
fmap f AlexNone = AlexNone
fmap f (AlexLastAcc x y z) = AlexLastAcc (f x) y z
fmap f (AlexLastSkip x y) = AlexLastSkip x y
data AlexAcc a user
= AlexAcc a
| AlexAccSkip
| AlexAccPred a (AlexAccPred user)
| AlexAccSkipPred (AlexAccPred user)
type AlexAccPred user = user -> AlexInput -> Int -> AlexInput -> Bool
-- -----------------------------------------------------------------------------
-- Predicates on a rule
alexAndPred p1 p2 user in1 len in2
= p1 user in1 len in2 && p2 user in1 len in2
--alexPrevCharIsPred :: Char -> AlexAccPred _
alexPrevCharIs c _ input _ _ = c == alexInputPrevChar input
alexPrevCharMatches f _ input _ _ = f (alexInputPrevChar input)
--alexPrevCharIsOneOfPred :: Array Char Bool -> AlexAccPred _
alexPrevCharIsOneOf arr _ input _ _ = arr ! alexInputPrevChar input
--alexRightContext :: Int -> AlexAccPred _
alexRightContext (sc) user _ _ input =
case alex_scan_tkn user input (0) input sc AlexNone of
(AlexNone, _) -> False
_ -> True
-- TODO: there's no need to find the longest
-- match when checking the right context, just
-- the first match will do.
-- used by wrappers
iUnbox (i) = i