xml-1.3.13: A simple XML library.

Copyright(c) Galois, Inc. 2008
LicenseBSD3
MaintainerIavor S. Diatchki <diatchki@galois.com>
Stabilityprovisional
Portabilityportable
Safe HaskellSafe-Inferred
LanguageHaskell98

Text.XML.Light.Cursor

Contents

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

Documentation

data Tag Source

Constructors

Tag 

Fields

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

Instances

getTag :: Element -> Tag Source

setTag :: Tag -> Element -> Element Source

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

data Cursor Source

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

Constructors

Cur 

Fields

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

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

Conversions

fromContent :: Content -> Cursor Source

A cursor for the given content.

fromElement :: Element -> Cursor Source

A cursor for the given element.

fromForest :: [Content] -> Maybe Cursor Source

The location of the first tree in a forest.

toForest :: Cursor -> [Content] Source

Computes the forest containing this location.

toTree :: Cursor -> Content Source

Computes the tree containing this location.

Moving around

parent :: Cursor -> Maybe Cursor Source

The parent of the given location.

root :: Cursor -> Cursor Source

The top-most parent of the given location.

getChild :: Int -> Cursor -> Maybe Cursor Source

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

firstChild :: Cursor -> Maybe Cursor Source

The first child of the given location.

lastChild :: Cursor -> Maybe Cursor Source

The last child of the given location.

left :: Cursor -> Maybe Cursor Source

The left sibling of the given location.

right :: Cursor -> Maybe Cursor Source

The right sibling of the given location.

nextDF :: Cursor -> Maybe Cursor Source

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 Source

The first child that satisfies a predicate.

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

Find the next left sibling that satisfies a predicate.

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

Find the next right sibling that satisfies a predicate.

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

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

Node classification

isRoot :: Cursor -> Bool Source

Are we at the top of the document?

isFirst :: Cursor -> Bool Source

Are we at the left end of the the document?

isLast :: Cursor -> Bool Source

Are we at the right end of the document?

isLeaf :: Cursor -> Bool Source

Are we at the bottom of the document?

isChild :: Cursor -> Bool Source

Do we have a parent?

hasChildren :: Cursor -> Bool Source

Do we have children?

getNodeIndex :: Cursor -> Int Source

Get the node index inside the sequence of children

Updates

setContent :: Content -> Cursor -> Cursor Source

Change the current content.

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

Modify the current content.

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

Modify the current content, allowing for an effect.

Inserting content

insertLeft :: Content -> Cursor -> Cursor Source

Insert content to the left of the current position.

insertRight :: Content -> Cursor -> Cursor Source

Insert content to the right of the current position.

insertGoLeft :: Content -> Cursor -> Cursor Source

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

insertGoRight :: Content -> Cursor -> Cursor Source

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

Removing content

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

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

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

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

removeGoLeft :: Cursor -> Maybe Cursor Source

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

removeGoRight :: Cursor -> Maybe Cursor Source

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

removeGoUp :: Cursor -> Maybe Cursor Source

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