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|
-- |
-- Module : Statistics.Internal
-- Copyright : (c) 2009 Bryan O'Sullivan
-- License : BSD3
--
-- Maintainer : bos@serpentine.com
-- Stability : experimental
-- Portability : portable
--
--
module Statistics.Internal (
-- * Default definitions for Show
defaultShow1
, defaultShow2
, defaultShow3
-- * Default definitions for Read
, defaultReadPrecM1
, defaultReadPrecM2
, defaultReadPrecM3
-- * Reexports
, Show(..)
, Read(..)
) where
import Control.Applicative
import Control.Monad
import Text.Read
----------------------------------------------------------------
-- Default show implementations
----------------------------------------------------------------
defaultShow1 :: (Show a) => String -> a -> Int -> ShowS
defaultShow1 con a n
= showParen (n >= 11)
( showString con
. showChar ' '
. showsPrec 11 a
)
defaultShow2 :: (Show a, Show b) => String -> a -> b -> Int -> ShowS
defaultShow2 con a b n
= showParen (n >= 11)
( showString con
. showChar ' '
. showsPrec 11 a
. showChar ' '
. showsPrec 11 b
)
defaultShow3 :: (Show a, Show b, Show c)
=> String -> a -> b -> c -> Int -> ShowS
defaultShow3 con a b c n
= showParen (n >= 11)
( showString con
. showChar ' '
. showsPrec 11 a
. showChar ' '
. showsPrec 11 b
. showChar ' '
. showsPrec 11 c
)
----------------------------------------------------------------
-- Default read implementations
----------------------------------------------------------------
defaultReadPrecM1 :: (Read a) => String -> (a -> Maybe r) -> ReadPrec r
defaultReadPrecM1 con f = parens $ prec 10 $ do
expect con
a <- readPrec
maybe empty return $ f a
defaultReadPrecM2 :: (Read a, Read b) => String -> (a -> b -> Maybe r) -> ReadPrec r
defaultReadPrecM2 con f = parens $ prec 10 $ do
expect con
a <- readPrec
b <- readPrec
maybe empty return $ f a b
defaultReadPrecM3 :: (Read a, Read b, Read c)
=> String -> (a -> b -> c -> Maybe r) -> ReadPrec r
defaultReadPrecM3 con f = parens $ prec 10 $ do
expect con
a <- readPrec
b <- readPrec
c <- readPrec
maybe empty return $ f a b c
expect :: String -> ReadPrec ()
expect str = do
Ident s <- lexP
guard (s == str)
|
