NLP.GenI.General

This module provides some very generic, non-GenI specific functions on strings, trees and other miscellaneous odds and ends. Whenever possible, one should try to replace these functions with versions that are available in the standard libraries, or the Haskell platform ones, or on hackage.

IO

ePutStr :: String -> IO ()

putStr on stderr

ePutStrLn :: String -> IO ()

eFlush :: IO ()

Strings

isGeniIdentLetter :: Char -> Bool

dropTillIncluding :: Char -> String -> String

Drop all characters up to and including the one in question

trim :: String -> String

toUpperHead :: String -> String

Make the first character of a string upper case

toLowerHead :: String -> String

Make the first character of a string lower case

toAlphaNum :: String -> [AlphaNum]

An alphanumeric sort is one where you treat the numbers in the string as actual numbers. An alphanumeric sort would put x2 before x100, because 2 < 10, wheraeas a naive sort would put it the other way around because the characters 1 < 2. To sort alphanumerically, just 'sortBy (comparing toAlphaNum)'

quoteString :: String -> String

quoteText :: Text -> Text

clumpBy :: (a -> Int) -> Int -> [a] -> [[a]]

break a list of items into sublists of length < the clump size, taking into consideration that each item in the clump will have a single gap of padding interspersed

any item whose length is greater than the clump size is put into a clump by itself

given a length function clumpBy (length.show) 8 [hello, this, is, a, list]

Triples

first3 :: (a -> a2) -> (a, b, c) -> (a2, b, c)

second3 :: (b -> b2) -> (a, b, c) -> (a, b2, c)

third3 :: (c -> c2) -> (a, b, c) -> (a, b, c2)

fst3 :: (a, b, c) -> a

snd3 :: (a, b, c) -> b

thd3 :: (a, b, c) -> c

Lists

map' :: (a -> b) -> [a] -> [b]

A strict version of map

buckets :: Ord b => (a -> b) -> [a] -> [(b, [a])]

isEmptyIntersect :: Eq a => [a] -> [a] -> Bool

True if the intersection of two lists is empty.

groupByFM :: Ord b => (a -> b) -> [a] -> Map b [a]

Serves the same function as groupBy. It groups together items by some property they have in common. The difference is that the property is used as a key to a Map that you can lookup.

insertToListMap :: Ord b => b -> a -> Map b [a] -> Map b [a]

histogram :: Ord a => [a] -> Map a Int

combinations :: [[a]] -> [[a]]

mapMaybeM :: Monad m => (a -> m (Maybe b)) -> [a] -> m [b]

repList :: (a -> Bool) -> (a -> a) -> [a] -> [a]

Return the list, modifying only the first matching item.

Trees

mapTree' :: (a -> b) -> Tree a -> Tree b

Strict version of mapTree (for non-strict, just use fmap)

filterTree :: (a -> Bool) -> Tree a -> [a]

Like filter, except on Trees. Filter might not be a good name, though, because we return a list of nodes, not a tree.

treeLeaves :: Tree a -> [a]

The leaf nodes of a Tree

preTerminals :: Tree a -> [(a, a)]

Return pairs of (parent, terminal)

repNode

Arguments

:: (Tree a -> Tree a)

replacement function

-> (Tree a -> Bool)

filtering function

-> Tree a

-> Maybe (Tree a)

repNode fn filt t returns a version of t in which the first node which filt matches is transformed using fn.

repAllNode :: (Tree a -> Tree a) -> (Tree a -> Bool) -> Tree a -> Tree a

Like repNode except that it performs the operations on all nodes that match and doesn't care if any nodes match or not

listRepNode

Arguments

:: (Tree a -> Tree a)

replacement function

-> (Tree a -> Bool)

filtering function

-> [Tree a]

nodes

-> ([Tree a], Bool)

Like repNode but on a list of tree nodes

repNodeByNode

Arguments

:: (a -> Bool)

which node?

-> a

-> Tree a

-> Tree a

Replace a node in the tree in-place with another node; keep the children the same. If the node is not found in the tree, or if there are multiple instances of the node, this is treated as an error.

Intervals

type Interval = (Int, Int)

(!+!) :: Interval -> Interval -> Interval

Add two intervals

ival :: Int -> Interval

ival x builds a trivial interval from x to x

showInterval :: Interval -> String

Bit vectors

type BitVector = Integer

showBitVector :: Int -> BitVector -> String

displays a bit vector, using a minimum number of bits

Errors, logging and exceptions

geniBug :: String -> a

errors specifically in GenI, which is very likely NOT the user's fault.

prettyException :: IOException -> String

mkLogname :: Typeable a => a -> String

The module name for an arbitrary data type