[project @ 2003-04-28 09:16:47 by ross]

portability fixes, plus marking these as non-portable (uses forall).

diff --git a/Text/ParserCombinators/ReadP.hs b/Text/ParserCombinators/ReadP.hs
index 32b6cfc..c05b983 100644 (file)
--- a/Text/ParserCombinators/ReadP.hs
+++ b/Text/ParserCombinators/ReadP.hs
@@ -7,7 +7,7 @@
 -- 
 -- Maintainer  :  libraries@haskell.org
 -- Stability   :  provisional
--- Portability :  portable
+-- Portability :  non-portable (local universal quantification)
 --
 -- This is a library of parser combinators, originally written by Koen Claessen.
 -- It parses all alternatives in parallel, so it never keeps hold of 
@@ -49,14 +49,20 @@ module Text.ParserCombinators.ReadP
  where
 
 import Control.Monad( MonadPlus(..) )
+#ifdef __GLASGOW_HASKELL__
 import GHC.Show( isSpace  )
 import GHC.Base
+#else
+import Data.Char( isSpace )
+#endif
 
 infixr 5 +++, <++
 
+#ifdef __GLASGOW_HASKELL__
 -- We define a local version of ReadS here,
 -- because its "real" definition site is in GHC.Read
 type ReadS a = String -> [(a,String)]
+#endif
 
 -- ---------------------------------------------------------------------------
 -- The P type
@@ -170,6 +176,7 @@ R f1 +++ R f2 = R (\k -> f1 k `mplus` f2 k)
 -- ^ Local, exclusive, left-biased choice: If left parser
 --   locally produces any result at all, then right parser is
 --   not used.
+#ifdef __GLASGOW_HASKELL__
 R f <++ q =
   do s <- look
      probe (f return) s 0#
@@ -182,6 +189,20 @@ R f <++ q =
 
   discard 0# = return ()
   discard n  = get >> discard (n-#1#)
+#else
+R f <++ q =
+  do s <- look
+     probe (f return) s 0
+ where
+  probe (Get f)        (c:s) n = probe (f c) s (n+1)
+  probe (Look f)       s     n = probe (f s) s n
+  probe p@(Result _ _) _     n = discard n >> R (p >>=)
+  probe (Final r)      _     _ = R (Final r >>=)
+  probe _              _     _ = q
+
+  discard 0 = return ()
+  discard n  = get >> discard (n-1)
+#endif
 
 gather :: ReadP a -> ReadP (String, a)
 -- ^ Transforms a parser into one that does the same, but

diff --git a/Text/ParserCombinators/ReadPrec.hs b/Text/ParserCombinators/ReadPrec.hs
index 77cd61e..3c33bb1 100644 (file)
--- a/Text/ParserCombinators/ReadPrec.hs
+++ b/Text/ParserCombinators/ReadPrec.hs
@@ -7,7 +7,7 @@
 -- 
 -- Maintainer  :  libraries@haskell.org
 -- Stability   :  provisional
--- Portability :  portable
+-- Portability :  non-portable (uses Text.ParserCombinators.ReadP)
 --
 -- This library defines parser combinators for precedence parsing.
 
@@ -58,8 +58,10 @@ import qualified Text.ParserCombinators.ReadP as ReadP
   )
 
 import Control.Monad( MonadPlus(..) )
+#ifdef __GLASGOW_HASKELL__
 import GHC.Num( Num(..) )
 import GHC.Base
+#endif
 
 -- ---------------------------------------------------------------------------
 -- The readPrec type
@@ -130,9 +132,11 @@ choice ps = foldr (+++) pfail ps
 -- ---------------------------------------------------------------------------
 -- Converting between ReadPrec and Read
 
+#ifdef __GLASGOW_HASKELL__
 -- We define a local version of ReadS here,
 -- because its "real" definition site is in GHC.Read
 type ReadS a = String -> [(a,String)]
+#endif
 
 readPrec_to_P :: ReadPrec a -> (Int -> ReadP a)
 readPrec_to_P (P f) = f

diff --git a/Text/Read/Lex.hs b/Text/Read/Lex.hs
index dd26cb1..9be4220 100644 (file)
--- a/Text/Read/Lex.hs
+++ b/Text/Read/Lex.hs
@@ -7,7 +7,7 @@
 -- 
 -- Maintainer  :  libraries@haskell.org
 -- Stability   :  provisional
--- Portability :  portable
+-- Portability :  non-portable (uses Text.ParserCombinators.ReadP)
 --
 -- The cut-down Haskell lexer, used by Text.Read
 --
@@ -31,6 +31,7 @@ module Text.Read.Lex
 
 import Text.ParserCombinators.ReadP
 
+#ifdef __GLASGOW_HASKELL__
 import GHC.Base
 import GHC.Num( Num(..), Integer )
 import GHC.Show( Show(.. ), isSpace, isAlpha, isAlphaNum )
@@ -38,6 +39,14 @@ import GHC.Real( Ratio(..), Integral, Rational, (%), fromIntegral,
                 toInteger, (^), (^^), infinity, notANumber )
 import GHC.List
 import GHC.Enum( maxBound )
+#else
+import Prelude hiding ( lex )
+import Data.Char( chr, ord, isSpace, isAlpha, isAlphaNum )
+import Data.Ratio( Ratio, (%) )
+#endif
+#ifdef __HUGS__
+import Hugs.Prelude( Ratio(..) )
+#endif
 import Data.Maybe
 import Control.Monad
 
@@ -127,6 +136,12 @@ lexId = lex_nan <++ lex_id
     isIdsChar c = isAlpha c || c == '_'
     isIdfChar c = isAlphaNum c || c `elem` "_'"
 
+#ifndef __GLASGOW_HASKELL__
+infinity, notANumber :: Rational
+infinity   = 1 :% 0
+notANumber = 0 :% 0
+#endif
+
 -- ---------------------------------------------------------------------------
 -- Lexing character literals