Text.Regex.TDFA.IntArrTrieSet

This creates a lazy Trie based on a finite range of Ints and is used to memorize a function over the subsets of this range.

To create a Trie you need two supply 2 things * Range of keys to bound * A function or functions used to construct the value for a subset of keys

The Trie uses the Array type internally.

Documentation

data TrieSet v

Constructors

TrieSet

Fields

value :: v

next :: Array Int (TrieSet v)

lookupAsc :: TrieSet v -> [Int] -> v

This is the accessor for the Trie. The list of keys should be sorted.

fromBounds

Arguments

:: (Int, Int)

(lower,upper) range of keys, lower<=upper

-> ([Int] -> v)

Function from list of keys to its value. It must work for distinct ascending lists.

-> TrieSet v

The constructed Trie

This is a Trie constructor for a complete range of keys.

fromSinglesMerge

Arguments

:: v

value for (lookupAsc trie [])

-> (v -> v -> v)

merge operation on values

-> (Int, Int)

(lower,upper) range of keys, lower<=upper

-> (Int -> v)

Function from a single key to its value

-> TrieSet v

The constructed Trie

This is a Trie constructor for a complete range of keys that uses a function from single values and a merge operation on values to fill the Trie.

fromSinglesSum

Arguments

:: ([v] -> v)

summation operation for values

-> (Int, Int)

(lower,upper) range of keys, lower <= upper

-> (Int -> v)

Function from a single key to its value

-> TrieSet v

The constructed Trie

This is a Trie constructor for a complete range of keys that uses a function from single values and a sum operation of values to fill the Trie.