Text.XML.Light.Cursor

Portability	portable
Stability	provisional
Maintainer	Iavor S. Diatchki <diatchki@galois.com>

Contents

Conversions

Moving around

Searching

Node classification

Updates

Inserting content
Removing content

Description

XML cursors for working XML content withing the context of an XML document. This implementation is based on the general tree zipper written by Krasimir Angelov and Iavor S. Diatchki.

Synopsis

data Tag = Tag {

tagName :: QName

tagAttribs :: [Attr]

tagLine :: Maybe Line

}

getTag :: Element -> Tag

setTag :: Tag -> Element -> Element

fromTag :: Tag -> [Content] -> Element

data Cursor = Cur {

current :: Content

lefts :: [Content]

rights :: [Content]

parents :: Path

}

type Path = [([Content], Tag, [Content])]

fromContent :: Content -> Cursor

fromElement :: Element -> Cursor

fromForest :: [Content] -> Maybe Cursor

toForest :: Cursor -> [Content]

toTree :: Cursor -> Content

parent :: Cursor -> Maybe Cursor

root :: Cursor -> Cursor

getChild :: Int -> Cursor -> Maybe Cursor

firstChild :: Cursor -> Maybe Cursor

lastChild :: Cursor -> Maybe Cursor

left :: Cursor -> Maybe Cursor

right :: Cursor -> Maybe Cursor

nextDF :: Cursor -> Maybe Cursor

findChild :: (Cursor -> Bool) -> Cursor -> Maybe Cursor

findLeft :: (Cursor -> Bool) -> Cursor -> Maybe Cursor

findRight :: (Cursor -> Bool) -> Cursor -> Maybe Cursor

findRec :: (Cursor -> Bool) -> Cursor -> Maybe Cursor

isRoot :: Cursor -> Bool

isFirst :: Cursor -> Bool

isLast :: Cursor -> Bool

isLeaf :: Cursor -> Bool

isChild :: Cursor -> Bool

hasChildren :: Cursor -> Bool

getNodeIndex :: Cursor -> Int

setContent :: Content -> Cursor -> Cursor

modifyContent :: (Content -> Content) -> Cursor -> Cursor

modifyContentM :: Monad m => (Content -> m Content) -> Cursor -> m Cursor

insertLeft :: Content -> Cursor -> Cursor

insertRight :: Content -> Cursor -> Cursor

insertGoLeft :: Content -> Cursor -> Cursor

insertGoRight :: Content -> Cursor -> Cursor

removeLeft :: Cursor -> Maybe (Content, Cursor)

removeRight :: Cursor -> Maybe (Content, Cursor)

removeGoLeft :: Cursor -> Maybe Cursor

removeGoRight :: Cursor -> Maybe Cursor

removeGoUp :: Cursor -> Maybe Cursor

Documentation

data Tag

Constructors

Tag

tagName :: QName
tagAttribs :: [Attr]
tagLine :: Maybe Line

Instances

Show Tag

getTag :: Element -> Tag

setTag :: Tag -> Element -> Element

fromTag :: Tag -> [Content] -> Element

data Cursor

The position of a piece of content in an XML document.

Constructors

Cur

current :: Content	The currently selected content.
lefts :: [Content]	Siblings on the left, closest first.
rights :: [Content]	Siblings on the right, closest first.
parents :: Path	The contexts of the parent elements of this location.

Instances

Show Cursor

type Path = [([Content], Tag, [Content])]

Conversions

fromContent :: Content -> Cursor

A cursor for the given content.

fromElement :: Element -> Cursor

A cursor for the given element.

fromForest :: [Content] -> Maybe Cursor

The location of the first tree in a forest.

toForest :: Cursor -> [Content]

Computes the forest containing this location.

toTree :: Cursor -> Content

Computes the tree containing this location.

Moving around

parent :: Cursor -> Maybe Cursor

The parent of the given location.

root :: Cursor -> Cursor

The top-most parent of the given location.

getChild :: Int -> Cursor -> Maybe Cursor

The child with the given index (starting from 0).

firstChild :: Cursor -> Maybe Cursor

The first child of the given location.

lastChild :: Cursor -> Maybe Cursor

The last child of the given location.

left :: Cursor -> Maybe Cursor

The left sibling of the given location.

right :: Cursor -> Maybe Cursor

The right sibling of the given location.

nextDF :: Cursor -> Maybe Cursor

The next position in a left-to-right depth-first traversal of a document: either the first child, right sibling, or the right sibling of a parent that has one.

Searching

findChild :: (Cursor -> Bool) -> Cursor -> Maybe Cursor

The first child that satisfies a predicate.

findLeft :: (Cursor -> Bool) -> Cursor -> Maybe Cursor

Find the next left sibling that satisfies a predicate.

findRight :: (Cursor -> Bool) -> Cursor -> Maybe Cursor

Find the next right sibling that satisfies a predicate.

findRec :: (Cursor -> Bool) -> Cursor -> Maybe Cursor

Perform a depth first search for a descendant that satisfies the given predicate.

Node classification

isRoot :: Cursor -> Bool

Are we at the top of the document?

isFirst :: Cursor -> Bool

Are we at the left end of the the document?

isLast :: Cursor -> Bool

Are we at the right end of the document?

isLeaf :: Cursor -> Bool

Are we at the bottom of the document?

isChild :: Cursor -> Bool

Do we have a parent?

hasChildren :: Cursor -> Bool

Do we have children?

getNodeIndex :: Cursor -> Int

Get the node index inside the sequence of children

Updates

setContent :: Content -> Cursor -> Cursor

Change the current content.

modifyContent :: (Content -> Content) -> Cursor -> Cursor

Modify the current content.

modifyContentM :: Monad m => (Content -> m Content) -> Cursor -> m Cursor

Modify the current content, allowing for an effect.

Inserting content

insertLeft :: Content -> Cursor -> Cursor

Insert content to the left of the current position.

insertRight :: Content -> Cursor -> Cursor

Insert content to the right of the current position.

insertGoLeft :: Content -> Cursor -> Cursor

Insert content to the left of the current position. The new content becomes the current position.

insertGoRight :: Content -> Cursor -> Cursor

Insert content to the right of the current position. The new content becomes the current position.

Removing content

removeLeft :: Cursor -> Maybe (Content, Cursor)

Remove the content on the left of the current position, if any.

removeRight :: Cursor -> Maybe (Content, Cursor)

Remove the content on the right of the current position, if any.

removeGoLeft :: Cursor -> Maybe Cursor

Remove the current element. The new position is the one on the left.

removeGoRight :: Cursor -> Maybe Cursor

Remove the current element. The new position is the one on the right.

removeGoUp :: Cursor -> Maybe Cursor

Remove the current element. The new position is the parent of the old position.

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