72 lines
1.8 KiB
Haskell
72 lines
1.8 KiB
Haskell
-- standard always-available imports and utilities
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module Ledger.Utils (
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module Ledger.Utils,
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module Char,
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module Data.List,
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module Data.Tree,
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-- module Data.Map,
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module Data.Ord,
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module Data.Maybe,
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module Text.Printf,
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module Text.Regex,
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module Debug.Trace,
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module Test.QuickCheck,
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module Test.HUnit
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)
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where
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import Char
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import Data.List
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import Data.Tree
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import qualified Data.Map
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import Data.Ord
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import Data.Maybe
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import Text.Printf
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import Text.Regex
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import Debug.Trace
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import Test.QuickCheck hiding (test, Testable)
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import Test.HUnit
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-- lists
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splitAtElement :: Eq a => a -> [a] -> [[a]]
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splitAtElement e l =
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case dropWhile (e==) l of
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[] -> []
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l' -> first : splitAtElement e rest
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where
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(first,rest) = break (e==) l'
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-- trees
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-- aliases
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root = rootLabel
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branches = subForest
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-- remove all nodes past a certain depth
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treeprune :: Int -> Tree a -> Tree a
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treeprune 0 t = Node (root t) []
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treeprune d t = Node (root t) (map (treeprune $ d-1) $ branches t)
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-- apply f to all tree nodes
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treemap :: (a -> b) -> Tree a -> Tree b
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treemap f t = Node (f $ root t) (map (treemap f) $ branches t)
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-- remove all subtrees whose nodes do not fulfill predicate
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treefilter :: (a -> Bool) -> Tree a -> Tree a
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treefilter f t = Node
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(root t)
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(map (treefilter f) $ filter (treeany f) $ branches t)
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-- is predicate true in any node of tree ?
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treeany :: (a -> Bool) -> Tree a -> Bool
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treeany f t = (f $ root t) || (any (treeany f) $ branches t)
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-- treedrop -- remove the leaves which do fulfill predicate.
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-- treedropall -- do this repeatedly.
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-- debugging
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strace a = trace (show a) a -- trace a showable expression
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