-- -----------------------------------------------------------------------------
--
-- Util.hs, part of Alex
--
-- (c) Simon Marlow 2003
--
-- General utilities used in various parts of Alex
--
-- ----------------------------------------------------------------------------}
module Util
( str
, char
, nl
, paren
, brack
, interleave_shows
, space
, cjustify
, ljustify
, rjustify
, spaces
, hline
) where
-- Pretty-printing utilities
str :: String -> String -> String
str = showString
char :: Char -> String -> String
char c = (c :)
nl :: String -> String
nl = char '\n'
paren :: (String -> String) -> String -> String
paren s = char '(' . s . char ')'
brack :: (String -> String) -> String -> String
brack s = char '[' . s . char ']'
interleave_shows :: (String -> String) -> [String -> String] -> String -> String
interleave_shows _ [] = id
interleave_shows s xs = foldr1 (\a b -> a . s . b) xs
space :: String -> String
space = char ' '
cjustify, ljustify, rjustify :: Int -> String -> String
cjustify n s = spaces halfm ++ s ++ spaces (m - halfm)
where
m = n - length s
halfm = m `div` 2
ljustify n s = s ++ spaces (max 0 (n - length s))
rjustify n s = spaces (n - length s) ++ s
spaces :: Int -> String
spaces n = replicate n ' '
hline :: String
hline = replicate 77 '-'