Down package:hxt

similar to processBottomUp, but recursively transforms a whole tree by applying an arrow to all subtrees with a top down depth first traversal strategie. In many cases processBottomUp and processTopDown give same results.

processTopDownUntil :: (ArrowTree a, Tree t) => a (t b) (t b) -> a (t b) (t b)

hxt Control.Arrow.ArrowTree

recursively transforms a whole tree by applying an arrow to all subtrees, but transformation stops when a tree is successfully transformed. the transformation is done top down example: processTopDownUntil (isHtmlTable `guards` tranformTable) transforms all top level table elements into something else, but inner tables remain unchanged

mvDown :: NavigatableTree t => t a -> Maybe (t a)

hxt Data.Tree.NavigatableTree.Class

descend one step to the leftmost child

processTopDownWithAttrl :: ArrowXml a => a XmlTree XmlTree -> a XmlTree XmlTree

hxt Text.XML.HXT.Arrow.XmlArrow

process a whole tree inclusive attribute list of element nodes see also: processTopDown