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|
{-# LANGUAGE FlexibleInstances #-}
{- |
Module : Text.Pandoc.XML.Light.Proc
Copyright : Copyright (C) 2007 Galois, Inc., 2021 John MacFarlane
License : GNU GPL, version 2 or above
Maintainer : John MacFarlane <jgm@berkeley.edu>
Stability : alpha
Portability : portable
This code is taken from xml-light, released under the BSD3 license.
-}
module Text.Pandoc.XML.Light.Proc
(
-- * Replacement for xml-light's Text.XML.Proc
strContent
, onlyElems
, elChildren
, onlyText
, findChildren
, filterChildren
, filterChildrenName
, findChild
, filterChild
, filterChildName
, findElement
, filterElement
, filterElementName
, findElements
, filterElements
, filterElementsName
, findAttr
, lookupAttr
, lookupAttrBy
, findAttrBy
) where
import Data.Text (Text)
import Data.Maybe (listToMaybe)
import Data.List(find)
import Text.Pandoc.XML.Light.Types
--
-- copied from xml-light Text.XML.Proc
--
-- | Get the text value of an XML element. This function
-- ignores non-text elements, and concatenates all text elements.
strContent :: Element -> Text
strContent = mconcat . map cdData . onlyText . elContent
-- | Select only the elements from a list of XML content.
onlyElems :: [Content] -> [Element]
onlyElems xs = [ x | Elem x <- xs ]
-- | Select only the elements from a parent.
elChildren :: Element -> [Element]
elChildren e = [ x | Elem x <- elContent e ]
-- | Select only the text from a list of XML content.
onlyText :: [Content] -> [CData]
onlyText xs = [ x | Text x <- xs ]
-- | Find all immediate children with the given name.
findChildren :: QName -> Element -> [Element]
findChildren q e = filterChildren ((q ==) . elName) e
-- | Filter all immediate children wrt a given predicate.
filterChildren :: (Element -> Bool) -> Element -> [Element]
filterChildren p e = filter p (onlyElems (elContent e))
-- | Filter all immediate children wrt a given predicate over their names.
filterChildrenName :: (QName -> Bool) -> Element -> [Element]
filterChildrenName p e = filter (p.elName) (onlyElems (elContent e))
-- | Find an immediate child with the given name.
findChild :: QName -> Element -> Maybe Element
findChild q e = listToMaybe (findChildren q e)
-- | Find an immediate child with the given name.
filterChild :: (Element -> Bool) -> Element -> Maybe Element
filterChild p e = listToMaybe (filterChildren p e)
-- | Find an immediate child with name matching a predicate.
filterChildName :: (QName -> Bool) -> Element -> Maybe Element
filterChildName p e = listToMaybe (filterChildrenName p e)
-- | Find the left-most occurrence of an element matching given name.
findElement :: QName -> Element -> Maybe Element
findElement q e = listToMaybe (findElements q e)
-- | Filter the left-most occurrence of an element wrt. given predicate.
filterElement :: (Element -> Bool) -> Element -> Maybe Element
filterElement p e = listToMaybe (filterElements p e)
-- | Filter the left-most occurrence of an element wrt. given predicate.
filterElementName :: (QName -> Bool) -> Element -> Maybe Element
filterElementName p e = listToMaybe (filterElementsName p e)
-- | Find all non-nested occurances of an element.
-- (i.e., once we have found an element, we do not search
-- for more occurances among the element's children).
findElements :: QName -> Element -> [Element]
findElements qn e = filterElementsName (qn==) e
-- | Find all non-nested occurrences of an element wrt. given predicate.
-- (i.e., once we have found an element, we do not search
-- for more occurances among the element's children).
filterElements :: (Element -> Bool) -> Element -> [Element]
filterElements p e
| p e = [e]
| otherwise = concatMap (filterElements p) $ onlyElems $ elContent e
-- | Find all non-nested occurences of an element wrt a predicate over element names.
-- (i.e., once we have found an element, we do not search
-- for more occurances among the element's children).
filterElementsName :: (QName -> Bool) -> Element -> [Element]
filterElementsName p e = filterElements (p.elName) e
-- | Lookup the value of an attribute.
findAttr :: QName -> Element -> Maybe Text
findAttr x e = lookupAttr x (elAttribs e)
-- | Lookup attribute name from list.
lookupAttr :: QName -> [Attr] -> Maybe Text
lookupAttr x = lookupAttrBy (x ==)
-- | Lookup the first attribute whose name satisfies the given predicate.
lookupAttrBy :: (QName -> Bool) -> [Attr] -> Maybe Text
lookupAttrBy p as = attrVal `fmap` find (p . attrKey) as
-- | Lookup the value of the first attribute whose name
-- satisfies the given predicate.
findAttrBy :: (QName -> Bool) -> Element -> Maybe Text
findAttrBy p e = lookupAttrBy p (elAttribs e)
|
