Portability | portable |
---|---|

Stability | experimental |

Maintainer | libraries@haskell.org |

Multi-way trees (*aka* rose trees) and forests.

- data Tree a = Node {}
- type Forest a = [Tree a]
- drawTree :: Tree String -> String
- drawForest :: Forest String -> String
- flatten :: Tree a -> [a]
- levels :: Tree a -> [[a]]
- unfoldTree :: (b -> (a, [b])) -> b -> Tree a
- unfoldForest :: (b -> (a, [b])) -> [b] -> Forest a
- unfoldTreeM :: Monad m => (b -> m (a, [b])) -> b -> m (Tree a)
- unfoldForestM :: Monad m => (b -> m (a, [b])) -> [b] -> m (Forest a)
- unfoldTreeM_BF :: Monad m => (b -> m (a, [b])) -> b -> m (Tree a)
- unfoldForestM_BF :: Monad m => (b -> m (a, [b])) -> [b] -> m (Forest a)

# Documentation

Multi-way trees, also known as *rose trees*.

# Two-dimensional drawing

drawForest :: Forest String -> StringSource

Neat 2-dimensional drawing of a forest.

# Extraction

# Building trees

unfoldTree :: (b -> (a, [b])) -> b -> Tree aSource

Build a tree from a seed value

unfoldForest :: (b -> (a, [b])) -> [b] -> Forest aSource

Build a forest from a list of seed values

unfoldTreeM :: Monad m => (b -> m (a, [b])) -> b -> m (Tree a)Source

Monadic tree builder, in depth-first order

unfoldForestM :: Monad m => (b -> m (a, [b])) -> [b] -> m (Forest a)Source

Monadic forest builder, in depth-first order

unfoldTreeM_BF :: Monad m => (b -> m (a, [b])) -> b -> m (Tree a)Source

Monadic tree builder, in breadth-first order,
using an algorithm adapted from
*Breadth-First Numbering: Lessons from a Small Exercise in Algorithm Design*,
by Chris Okasaki, *ICFP'00*.

unfoldForestM_BF :: Monad m => (b -> m (a, [b])) -> [b] -> m (Forest a)Source

Monadic forest builder, in breadth-first order,
using an algorithm adapted from
*Breadth-First Numbering: Lessons from a Small Exercise in Algorithm Design*,
by Chris Okasaki, *ICFP'00*.