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{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE StandaloneDeriving #-}
module Test.Haddock.Xhtml
( Xhtml(..)
, parseXhtml, dumpXhtml
, stripLinks, stripLinksWhen, stripAnchorsWhen, stripFooter
) where
import Data.Generics.Aliases
import Data.Generics.Schemes
import Text.XML.Light
import Text.XHtml
newtype Xhtml = Xhtml
{ xhtmlElement :: Element
} deriving Eq
-- TODO: Find a way to avoid warning about orphan instances.
deriving instance Eq Element
deriving instance Eq Content
deriving instance Eq CData
parseXhtml :: String -> Maybe Xhtml
parseXhtml = fmap Xhtml . parseXMLDoc
dumpXhtml :: Xhtml -> String
dumpXhtml = ppElement . xhtmlElement
stripLinks :: Xhtml -> Xhtml
stripLinks = stripLinksWhen (const True)
stripLinksWhen :: (String -> Bool) -> Xhtml -> Xhtml
stripLinksWhen p =
processAnchors unlink
where
unlink attr@(Attr { attrKey = key, attrVal = val })
| qName key == "href" && p val = attr { attrVal = "#" }
| otherwise = attr
stripAnchorsWhen :: (String -> Bool) -> Xhtml -> Xhtml
stripAnchorsWhen p =
processAnchors unname
where
unname attr@(Attr { attrKey = key, attrVal = val })
| qName key == "name" && p val = attr { attrVal = "" }
| otherwise = attr
processAnchors :: (Attr -> Attr) -> Xhtml -> Xhtml
processAnchors f = Xhtml . everywhere (mkT f) . xhtmlElement
stripFooter :: Xhtml -> Xhtml
stripFooter =
Xhtml . everywhere (mkT defoot) . xhtmlElement
where
defoot el
| isFooter el = el { elContent = [] }
| otherwise = el
isFooter el = any isFooterAttr $ elAttribs el
isFooterAttr (Attr { .. }) = and
[ qName attrKey == "id"
, attrVal == "footer"
]
xmlElementToXhtml :: Element -> Html
xmlElementToXhtml (Element { .. }) =
tag (qName elName) contents ! attrs
where
contents = mconcat $ map xmlContentToXhtml elContent
attrs = map xmlAttrToXhtml elAttribs
xmlContentToXhtml :: Content -> Html
xmlContentToXhtml (Elem el) = xmlElementToXhtml el
xmlContentToXhtml (Text text) = toHtml $ cdData text
xmlContentToXhtml (CRef cref) = noHtml
xmlAttrToXhtml :: Attr -> HtmlAttr
xmlAttrToXhtml (Attr { .. }) = strAttr (qName attrKey) attrVal
|
