Reorganisation of the source tree

[ghc-hetmet.git] / ghc / compiler / parser / LexCore.hs

diff --git a/ghc/compiler/parser/LexCore.hs b/ghc/compiler/parser/LexCore.hs
deleted file mode 100644 (file)
index 1a545a3..0000000
--- a/ghc/compiler/parser/LexCore.hs
+++ /dev/null
@@ -1,130 +0,0 @@
-module LexCore where
-
-import ParserCoreUtils
-import Ratio
-import Char
-import qualified Numeric( readFloat, readDec )
-
-isNameChar c = isAlpha c || isDigit c || (c == '_') || (c == '\'') 
-isKeywordChar c = isAlpha c || (c == '_') 
-
-lexer :: (Token -> P a) -> P a 
-lexer cont []          = cont TKEOF []
-lexer cont ('\n':cs)   = \line -> lexer cont cs (line+1)
-lexer cont ('-':'>':cs) = cont TKrarrow cs
-
-lexer cont (c:cs) 
-      | isSpace c              = lexer cont cs
-      | isLower c || (c == '_') = lexName cont TKname (c:cs)
-      | isUpper c              = lexName cont TKcname (c:cs)
-      | isDigit c || (c == '-') = lexNum cont (c:cs)
-
-lexer cont ('%':cs)    = lexKeyword cont cs
-lexer cont ('\'':cs)   = lexChar cont cs
-lexer cont ('\"':cs)   = lexString [] cont cs 
-lexer cont ('#':cs)    = cont TKhash cs
-lexer cont ('(':cs)    = cont TKoparen cs
-lexer cont (')':cs)    = cont TKcparen cs
-lexer cont ('{':cs)    = cont TKobrace cs
-lexer cont ('}':cs)    = cont TKcbrace cs
-lexer cont ('=':cs)     = cont TKeq cs
-lexer cont (':':':':cs) = cont TKcoloncolon cs
-lexer cont ('*':cs)    = cont TKstar cs
-lexer cont ('.':cs)    = cont TKdot cs
-lexer cont ('\\':cs)    = cont TKlambda cs
-lexer cont ('@':cs)    = cont TKat cs
-lexer cont ('?':cs)    = cont TKquestion cs
-lexer cont (';':cs)    = cont TKsemicolon cs
-lexer cont (c:cs)      = failP "invalid character" [c]
-
-
-
-lexChar cont ('\\':'x':h1:h0:'\'':cs)
-       | isHexEscape [h1,h0] =  cont (TKchar (hexToChar h1 h0)) cs
-lexChar cont ('\\':cs)          = failP "invalid char character" ('\\':(take 10 cs))
-lexChar cont ('\'':cs)          = failP "invalid char character" ['\'']
-lexChar cont ('\"':cs)          = failP "invalid char character" ['\"']
-lexChar cont (c:'\'':cs) = cont (TKchar c) cs
-
-
-lexString s cont ('\\':'x':h1:h0:cs) 
-       | isHexEscape [h1,h0] = lexString (s++[hexToChar h1 h0]) cont cs
-lexString s cont ('\\':cs) = failP "invalid string character" ['\\']
-lexString s cont ('\'':cs) = failP "invalid string character" ['\'']
-lexString s cont ('\"':cs) = cont (TKstring s) cs
-lexString s cont (c:cs) = lexString (s++[c]) cont cs
-
-isHexEscape = all (\c -> isHexDigit c && (isDigit c || isLower c))
-
-hexToChar h1 h0 = chr (digitToInt h1 * 16 + digitToInt h0)
-
-
-lexNum cont cs =
-  case cs of
-     ('-':cs) -> f (-1) cs
-     _               -> f 1 cs
- where f sgn cs = 
-         case span isDigit cs of
-          (digits,'.':c:rest) 
-               | isDigit c -> cont (TKrational (fromInteger sgn * r)) rest'
-               where ((r,rest'):_) = readFloat (digits ++ ('.':c:rest))
-               -- When reading a floating-point number, which is
-               -- a bit complicated, use the Haskell 98 library function
-          (digits,rest) -> cont (TKinteger (sgn * (read digits))) rest
-
-lexName cont cstr cs = cont (cstr name) rest
-   where (name,rest) = span isNameChar cs
-
-lexKeyword cont cs = 
-   case span isKeywordChar cs of
-      ("module",rest) -> cont TKmodule rest
-      ("data",rest)  -> cont TKdata rest
-      ("newtype",rest) -> cont TKnewtype rest
-      ("forall",rest) -> cont TKforall rest    
-      ("rec",rest) -> cont TKrec rest  
-      ("let",rest) -> cont TKlet rest  
-      ("in",rest) -> cont TKin rest    
-      ("case",rest) -> cont TKcase rest        
-      ("of",rest) -> cont TKof rest    
-      ("coerce",rest) -> cont TKcoerce rest    
-      ("note",rest) -> cont TKnote rest        
-      ("external",rest) -> cont TKexternal rest
-      ("_",rest) -> cont TKwild rest
-      _ -> failP "invalid keyword" ('%':cs) 
-
-
-#if __GLASGOW_HASKELL__ >= 504
--- The readFloat in the Numeric library will do the job
-
-readFloat :: (RealFrac a) => ReadS a
-readFloat = Numeric.readFloat
-
-#else
--- Haskell 98's Numeric.readFloat used to have a bogusly restricted signature
--- so it was incapable of reading a rational.  
--- So for GHCs that have that old bogus library, here is the code, written out longhand.
-
-readFloat r    = [(fromRational ((n%1)*10^^(k-d)),t) | (n,d,s) <- readFix r,
-                                                       (k,t)   <- readExp s] ++
-                 [ (0/0, t) | ("NaN",t)      <- lex r] ++
-                 [ (1/0, t) | ("Infinity",t) <- lex r]
-               where 
-                 readFix r = [(read (ds++ds'), length ds', t)
-                             | (ds,d) <- lexDigits r,
-                               (ds',t) <- lexFrac d ]
-               
-                 lexFrac ('.':ds) = lexDigits ds
-                 lexFrac s        = [("",s)]        
-                 
-                 readExp (e:s) | e `elem` "eE" = readExp' s
-                 readExp s                     = [(0,s)]
-                 
-                 readExp' ('-':s) = [(-k,t) | (k,t) <- Numeric.readDec s]
-                 readExp' ('+':s) = Numeric.readDec s
-                 readExp' s       = Numeric.readDec s
-
-lexDigits :: ReadS String 
-lexDigits s =  case span isDigit s of
-                (cs,s') | not (null cs) -> [(cs,s')]
-                otherwise               -> []
-#endif