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Lexer.hs
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{-# OPTIONS_GHC -fno-warn-unused-binds -fno-warn-missing-signatures #-}
{-# LANGUAGE CPP #-}
{-# LINE 1 "Lexer.x" #-}
module Lexer where
#if __GLASGOW_HASKELL__ >= 603
#include "ghcconfig.h"
#elif defined(__GLASGOW_HASKELL__)
#include "config.h"
#endif
#if __GLASGOW_HASKELL__ >= 503
import Data.Array
import Data.Array.Base (unsafeAt)
#else
import Array
#endif
{-# 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)
import Data.Char (ord)
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 :: AlexInput -> AlexInput
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 (_,_,[],[]) = Nothing
alexGetByte (p,_,[],(c:s)) = let p' = alexMove p c
(b:bs) = utf8Encode c
in p' `seq` Just (b, (p', c, bs, s))
-- -----------------------------------------------------------------------------
-- 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+alex_tab_size-1) `div` alex_tab_size)*alex_tab_size+1)
alexMove (AlexPn a l _) '\n' = AlexPn (a+1) (l+1) 1
alexMove (AlexPn a l c) _ = AlexPn (a+1) l (c+1)
-- -----------------------------------------------------------------------------
-- Default monad
-- -----------------------------------------------------------------------------
-- Monad (with ByteString input)
-- -----------------------------------------------------------------------------
-- Basic wrapper
-- -----------------------------------------------------------------------------
-- Basic wrapper, ByteString version
-- -----------------------------------------------------------------------------
-- Posn wrapper
-- Adds text positions to the basic model.
--alexScanTokens :: String -> [token]
alexScanTokens str0 = go (alexStartPos,'\n',[],str0)
where go inp__@(pos,_,_,str) =
case alexScan inp__ 0 of
AlexEOF -> []
AlexError ((AlexPn _ line column),_,_,_) -> error $ "lexical error at line " ++ (show line) ++ ", column " ++ (show column)
AlexSkip inp__' _ln -> go inp__'
AlexToken inp__' len act -> act pos (take len str) : go inp__'
-- -----------------------------------------------------------------------------
-- Posn wrapper, ByteString version
-- -----------------------------------------------------------------------------
-- GScan wrapper
-- For compatibility with previous versions of Alex, and because we can.
alex_tab_size :: Int
alex_tab_size = 8
alex_base :: Array Int Int
alex_base = listArray (0 :: Int, 50)
[ -8
, -39
, -38
, -53
, -144
, -13
, -143
, 100
, 0
, -117
, 228
, -116
, 0
, 293
, 540
, 767
, 471
, 0
, 6
, 885
, 1093
, 1168
, 1255
, 1330
, 1417
, 0
, 0
, 0
, 0
, 0
, 0
, 0
, 0
, 1549
, 1624
, 1711
, 1786
, 1873
, 1948
, 2035
, 2110
, 2197
, 2272
, 2359
, 2434
, 2521
, 2596
, 2683
, 2758
, 0
, 506
]
alex_table :: Array Int Int
alex_table = listArray (0 :: Int, 3013)
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, 18
, 18
, 18
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, 25
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