-- |
-- Module: Trace.Hpc.Coveralls.Util
-- Copyright: (c) 2014-2015 Guillaume Nargeot
-- License: BSD3
-- Maintainer: Guillaume Nargeot
-- Stability: experimental
--
-- Utility functions.
module Trace.Hpc.Coveralls.Util where
import Data.List
fst3 :: (a, b, c) -> a
fst3 (x, _, _) = x
snd3 :: (a, b, c) -> b
snd3 (_, x, _) = x
trd3 :: (a, b, c) -> c
trd3 (_, _, x) = x
fst4 :: (a, b, c, d) -> a
fst4 (x, _, _, _) = x
toFirstAndRest :: (a, b, c, d) -> (a, (b, c, d))
toFirstAndRest (a, b, c, d) = (a, (b, c, d))
listToMaybe :: [a] -> Maybe [a]
listToMaybe [] = Nothing
listToMaybe xs = Just xs
mcons :: Maybe a -> [a] -> [a]
mcons Nothing xs = xs
mcons (Just x) xs = x : xs
matchAny :: [String] -> String -> Bool
matchAny patterns fileName = any (`isPrefixOf` fileName) patterns
mapFirst :: (a -> a) -> [a] -> [a]
mapFirst f (x : xs) = f x : xs
mapFirst _ [] = []
mapLast :: (a -> a) -> [a] -> [a]
mapLast f [x] = [f x]
mapLast f (x : xs) = x : mapLast f xs
mapLast _ [] = []
subSeq :: Int -> Int -> [a] -> [a]
subSeq start end = drop start . take end
subSubSeq :: Int -> Int -> [[a]] -> [[a]]
subSubSeq start end = mapFirst (drop start) . mapLast (take end)
groupByIndex :: Int -> [(Int, a)] -> [[a]]
groupByIndex size = take size . flip (++) (repeat []) . groupByIndex' 0 []
where groupByIndex' _ ys [] = [ys]
groupByIndex' i ys xx@((xi, x) : xs) = if xi == i
then groupByIndex' i (x : ys) xs
else ys : groupByIndex' (i + 1) [] xx