module Prelude (
- -- List things
- [] (..),
+ -- * Standard types, classes and related functions
- map, (++), filter, concat,
+ -- ** Basic data types
+ Bool(False, True),
+ (&&), (||), not, otherwise,
+
+ Maybe(Nothing, Just),
+ maybe,
+
+ Either(Left, Right),
+ either,
+
+ Ordering(LT, EQ, GT),
+ Char, String,
+
+ -- *** Tuples
+ fst, snd, curry, uncurry,
+
+#if defined(__NHC__)
+ []((:), []), -- Not legal Haskell 98;
+ -- ... available through built-in syntax
+ module Data.Tuple, -- Includes tuple types
+ ()(..), -- Not legal Haskell 98
+ (->), -- ... available through built-in syntax
+#endif
+#ifdef __HUGS__
+ (:), -- Not legal Haskell 98
+#endif
+
+ -- ** Basic type classes
+ Eq((==), (/=)),
+ Ord(compare, (<), (<=), (>=), (>), max, min),
+ Enum(succ, pred, toEnum, fromEnum, enumFrom, enumFromThen,
+ enumFromTo, enumFromThenTo),
+ Bounded(minBound, maxBound),
+
+ -- ** Numbers
+
+ -- *** Numeric types
+ Int, Integer, Float, Double,
+ Rational,
+
+ -- *** Numeric type classes
+ Num((+), (-), (*), negate, abs, signum, fromInteger),
+ Real(toRational),
+ Integral(quot, rem, div, mod, quotRem, divMod, toInteger),
+ Fractional((/), recip, fromRational),
+ Floating(pi, exp, log, sqrt, (**), logBase, sin, cos, tan,
+ asin, acos, atan, sinh, cosh, tanh, asinh, acosh, atanh),
+ RealFrac(properFraction, truncate, round, ceiling, floor),
+ RealFloat(floatRadix, floatDigits, floatRange, decodeFloat,
+ encodeFloat, exponent, significand, scaleFloat, isNaN,
+ isInfinite, isDenormalized, isIEEE, isNegativeZero, atan2),
+
+ -- *** Numeric functions
+ subtract, even, odd, gcd, lcm, (^), (^^),
+ fromIntegral, realToFrac,
+
+ -- ** Monads and functors
+ Monad((>>=), (>>), return, fail),
+ Functor(fmap),
+ mapM, mapM_, sequence, sequence_, (=<<),
+
+ -- ** Miscellaneous functions
+ id, const, (.), flip, ($), until,
+ asTypeOf, error, undefined,
+ seq, ($!),
+
+ -- * List operations
+ map, (++), filter,
head, last, tail, init, null, length, (!!),
- foldl, foldl1, scanl, scanl1, foldr, foldr1, scanr, scanr1,
+ reverse,
+ -- ** Reducing lists (folds)
+ foldl, foldl1, foldr, foldr1,
+ -- *** Special folds
+ and, or, any, all,
+ sum, product,
+ concat, concatMap,
+ maximum, minimum,
+ -- ** Building lists
+ -- *** Scans
+ scanl, scanl1, scanr, scanr1,
+ -- *** Infinite lists
iterate, repeat, replicate, cycle,
+ -- ** Sublists
take, drop, splitAt, takeWhile, dropWhile, span, break,
- reverse, and, or,
- any, all, elem, notElem, lookup,
- maximum, minimum, concatMap,
+ -- ** Searching lists
+ elem, notElem, lookup,
+ -- ** Zipping and unzipping lists
zip, zip3, zipWith, zipWith3, unzip, unzip3,
-
+ -- ** Functions on strings
lines, words, unlines, unwords,
- sum, product,
- -- Everything from Text.Read and Text.Show
+ -- * Converting to and from @String@
ReadS, ShowS,
Read(readsPrec, readList),
Show(showsPrec, showList, show),
reads, shows, read, lex,
showChar, showString, readParen, showParen,
- -- Everything corresponding to the Report's PreludeIO
- ioError, userError, catch,
- FilePath, IOError,
+ -- * Basic Input and output
+ IO,
+ -- ** Simple I\/O operations
+ -- All I/O functions defined here are character oriented. The
+ -- treatment of the newline character will vary on different systems.
+ -- For example, two characters of input, return and linefeed, may
+ -- read as a single newline character. These functions cannot be
+ -- used portably for binary I/O.
+ -- *** Output functions
putChar,
putStr, putStrLn, print,
+ -- *** Input functions
getChar,
getLine, getContents, interact,
+ -- *** Files
+ FilePath,
readFile, writeFile, appendFile, readIO, readLn,
-
- Bool(..),
- Maybe(..),
- Either(..),
- Ordering(..),
- Char, String, Int, Integer, Float, Double, IO,
- Rational,
- []((:), []),
-
- module Data.Tuple,
- -- Includes tuple types + fst, snd, curry, uncurry
- ()(..), -- The unit type
- (->), -- functions
-
- Eq(..),
- Ord(..),
- Enum(..),
- Bounded(..),
- Num(..),
- Real(..),
- Integral(..),
- Fractional(..),
- Floating(..),
- RealFrac(..),
- RealFloat(..),
-
- -- Monad stuff, from GHC.Base, and defined here
- Monad(..),
- Functor(..),
- mapM, mapM_, sequence, sequence_, (=<<),
-
- maybe, either,
- (&&), (||), not, otherwise,
- subtract, even, odd, gcd, lcm, (^), (^^),
- fromIntegral, realToFrac,
- --exported by Data.Tuple: fst, snd, curry, uncurry,
- id, const, (.), flip, ($), until,
- asTypeOf, error, undefined,
- seq, ($!)
+ -- ** Exception handling in the I\/O monad
+ IOError, ioError, userError, catch
) where
+#ifndef __HUGS__
import Control.Monad
import System.IO
import Text.Read
import Data.Maybe
import Data.Bool
import Data.Tuple
+#endif
#ifdef __GLASGOW_HASKELL__
import GHC.Base
import GHC.Real
import GHC.Float
import GHC.Show
-import GHC.Conc
import GHC.Err ( error, undefined )
#endif
+#ifdef __HUGS__
+import Hugs.Prelude
+#endif
+
+#ifndef __HUGS__
infixr 0 $!
($!) :: (a -> b) -> a -> b
f $! x = x `seq` f x
-
+#endif