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{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE StandaloneDeriving #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE GADTs #-}
{-# OPTIONS_GHC -fno-warn-orphans #-}
module Test.Haddock.Xhtml
( Xml(..)
, parseXml, dumpXml
, stripLinks, stripLinksWhen, stripAnchorsWhen, stripFooter
) where
import Data.Data ( Data(..), Typeable, eqT, (:~:)(..) )
import Text.XML.Light
import Text.XHtml (Html, HtmlAttr, (!))
import qualified Text.XHtml as Xhtml
newtype Xml = Xml
{ xmlElement :: Element
} deriving Eq
deriving instance Eq Element
deriving instance Eq Content
deriving instance Eq CData
-- | Similar to @everywhere (mkT f) x@ from SYB.
gmapEverywhere :: forall a b. (Data a, Typeable b) => (b -> b) -> a -> a
gmapEverywhere f x = gmapT (gmapEverywhere f) $ case eqT @a @b of
Nothing -> x
Just Refl -> f x
parseXml :: String -> Maybe Xml
parseXml = fmap Xml . parseXMLDoc
dumpXml :: Xml -> String
dumpXml = Xhtml.renderHtmlFragment. xmlElementToXhtml . xmlElement
stripLinks :: Xml -> Xml
stripLinks = stripLinksWhen (const True)
stripLinksWhen :: (String -> Bool) -> Xml -> Xml
stripLinksWhen p =
processAnchors unlink
where
unlink attr@(Attr { attrKey = key, attrVal = val })
| qName key == "href" && p val = attr { attrVal = "#" }
| otherwise = attr
stripAnchorsWhen :: (String -> Bool) -> Xml -> Xml
stripAnchorsWhen p =
processAnchors unname
where
unname attr@(Attr { attrKey = key, attrVal = val })
| qName key == "name" && p val = attr { attrVal = "" }
| otherwise = attr
processAnchors :: (Attr -> Attr) -> Xml -> Xml
processAnchors f = Xml . gmapEverywhere f . xmlElement
stripFooter :: Xml -> Xml
stripFooter =
Xml . gmapEverywhere defoot . xmlElement
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 { .. }) =
Xhtml.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) = Xhtml.toHtml $ cdData text
xmlContentToXhtml (CRef _) = Xhtml.noHtml
xmlAttrToXhtml :: Attr -> HtmlAttr
xmlAttrToXhtml (Attr { .. }) = Xhtml.strAttr (qName attrKey) attrVal
|
