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|
--------------------------------------------------------------------
-- |
-- Module : Text.Atom.Feed.Import
-- Copyright : (c) Galois, Inc. 2007-2008,
-- (c) Sigbjorn Finne 2009-
-- License : BSD3
--
-- Maintainer: Sigbjorn Finne <sof@forkIO.com>
-- Stability : provisional
-- Portability:: portable
-- Description: Convert from XML to Atom
--
-- Convert from XML to Atom
--
--------------------------------------------------------------------
module Text.Atom.Feed.Import where
import Data.Maybe (listToMaybe, mapMaybe, isJust)
import Data.List (find)
import Control.Monad (guard,mplus)
import Text.Atom.Feed
import Text.Atom.Feed.Export (atomName, atomThreadName)
import Text.XML.Light as XML
pNodes :: String -> [XML.Element] -> [XML.Element]
pNodes x es = filter ((atomName x ==) . elName) es
pQNodes :: QName -> [XML.Element] -> [XML.Element]
pQNodes x es = filter ((x==) . elName) es
pNode :: String -> [XML.Element] -> Maybe XML.Element
pNode x es = listToMaybe (pNodes x es)
pQNode :: QName -> [XML.Element] -> Maybe XML.Element
pQNode x es = listToMaybe (pQNodes x es)
pLeaf :: String -> [XML.Element] -> Maybe String
pLeaf x es = strContent `fmap` pNode x es
pQLeaf :: QName -> [XML.Element] -> Maybe String
pQLeaf x es = strContent `fmap` pQNode x es
pAttr :: String -> XML.Element -> Maybe String
pAttr x e = fmap snd $ find sameAttr [ (k,v) | Attr k v <- elAttribs e ]
where
ax = atomName x
sameAttr (k,_) = k == ax || (not (isJust (qURI k)) && qName k == x)
pAttrs :: String -> XML.Element -> [String]
pAttrs x e = [ v | Attr k v <- elAttribs e, k == atomName x ]
pQAttr :: QName -> XML.Element -> Maybe String
pQAttr x e = lookup x [ (k,v) | Attr k v <- elAttribs e ]
pMany :: String -> (XML.Element -> Maybe a) -> [XML.Element] -> [a]
pMany p f es = mapMaybe f (pNodes p es)
children :: XML.Element -> [XML.Element]
children e = onlyElems (elContent e)
elementFeed :: XML.Element -> Maybe Feed
elementFeed e =
do guard (elName e == atomName "feed")
let es = children e
i <- pLeaf "id" es
t <- pTextContent "title" es `mplus` return (TextString "<no-title>")
u <- pLeaf "updated" es
return Feed
{ feedId = i
, feedTitle = t
, feedSubtitle = pTextContent "subtitle" es
, feedUpdated = u
, feedAuthors = pMany "author" pPerson es
, feedContributors = pMany "contributor" pPerson es
, feedCategories = pMany "category" pCategory es
, feedGenerator = pGenerator `fmap` pNode "generator" es
, feedIcon = pLeaf "icon" es
, feedLogo = pLeaf "logo" es
, feedRights = pTextContent "rights" es
, feedLinks = pMany "link" pLink es
, feedEntries = pMany "entry" pEntry es
, feedOther = other_es es
, feedAttrs = other_as (elAttribs e)
}
where
other_es es = filter (\ el -> not (elName el `elem` known_elts))
es
other_as as = filter (\ a -> not (attrKey a `elem` known_attrs))
as
-- let's have them all (including xml:base and xml:lang + xmlns: stuff)
known_attrs = []
known_elts = map atomName
[ "author"
, "category"
, "contributor"
, "generator"
, "icon"
, "id"
, "link"
, "logo"
, "rights"
, "subtitle"
, "title"
, "updated"
, "entry"
]
pTextContent :: String -> [XML.Element] -> Maybe TextContent
pTextContent tag es =
do e <- pNode tag es
case pAttr "type" e of
Nothing -> return (TextString (strContent e))
Just "text" -> return (TextString (strContent e))
Just "html" -> return (HTMLString (strContent e))
Just "xhtml" -> case children e of -- hmm...
[c] -> return (XHTMLString c)
_ -> Nothing -- Multiple XHTML children.
_ -> Nothing -- Unknown text content type.
pPerson :: XML.Element -> Maybe Person
pPerson e =
do let es = children e
name <- pLeaf "name" es -- or missing "name"
return Person
{ personName = name
, personURI = pLeaf "uri" es
, personEmail = pLeaf "email" es
, personOther = [] -- XXX?
}
pCategory :: XML.Element -> Maybe Category
pCategory e =
do term <- pAttr "term" e -- or missing "term" attribute
return Category
{ catTerm = term
, catScheme = pAttr "scheme" e
, catLabel = pAttr "label" e
, catOther = [] -- XXX?
}
pGenerator :: XML.Element -> Generator
pGenerator e = Generator
{ genURI = pAttr "href" e
, genVersion = pAttr "version" e
, genText = strContent e
}
pSource :: XML.Element -> Source
pSource e =
let es = children e
in Source
{ sourceAuthors = pMany "author" pPerson es
, sourceCategories = pMany "category" pCategory es
, sourceGenerator = pGenerator `fmap` pNode "generator" es
, sourceIcon = pLeaf "icon" es
, sourceId = pLeaf "id" es
, sourceLinks = pMany "link" pLink es
, sourceLogo = pLeaf "logo" es
, sourceRights = pTextContent "rights" es
, sourceSubtitle = pTextContent "subtitle" es
, sourceTitle = pTextContent "title" es
, sourceUpdated = pLeaf "updated" es
, sourceOther = [] -- XXX ?
}
pLink :: XML.Element -> Maybe Link
pLink e =
do uri <- pAttr "href" e
return Link
{ linkHref = uri
, linkRel = Right `fmap` pAttr "rel" e
, linkType = pAttr "type" e
, linkHrefLang = pAttr "hreflang" e
, linkTitle = pAttr "title" e
, linkLength = pAttr "length" e
, linkAttrs = other_as (elAttribs e)
, linkOther = []
}
where
other_as as = filter (\ a -> not (attrKey a `elem` known_attrs))
as
known_attrs = map atomName
[ "href", "rel", "type", "hreflang", "title", "length"]
pEntry :: XML.Element -> Maybe Entry
pEntry e =
do let es = children e
i <- pLeaf "id" es
t <- pTextContent "title" es
u <- pLeaf "updated" es `mplus` pLeaf "published" es
return Entry
{ entryId = i
, entryTitle = t
, entryUpdated = u
, entryAuthors = pMany "author" pPerson es
, entryContributor = pMany "contributor" pPerson es
, entryCategories = pMany "category" pCategory es
, entryContent = pContent =<< pNode "content" es
, entryLinks = pMany "link" pLink es
, entryPublished = pLeaf "published" es
, entryRights = pTextContent "rights" es
, entrySource = pSource `fmap` pNode "source" es
, entrySummary = pTextContent "summary" es
, entryInReplyTo = pInReplyTo es
, entryInReplyTotal = pInReplyTotal es
, entryAttrs = other_as (elAttribs e)
, entryOther = [] -- ?
}
where
other_as as = filter (\ a -> not (attrKey a `elem` known_attrs))
as
-- let's have them all (including xml:base and xml:lang + xmlns: stuff)
known_attrs = []
pContent :: XML.Element -> Maybe EntryContent
pContent e =
case pAttr "type" e of
Nothing -> return (TextContent (strContent e))
Just "text" -> return (TextContent (strContent e))
Just "html" -> return (HTMLContent (strContent e))
Just "xhtml" ->
case children e of
[] -> return (TextContent "")
[c] -> return (XHTMLContent c)
_ -> Nothing
Just ty ->
case pAttr "src" e of
Nothing -> return (MixedContent (Just ty) (elContent e))
Just uri -> return (ExternalContent (Just ty) uri)
pInReplyTotal :: [XML.Element] -> Maybe InReplyTotal
pInReplyTotal es = do
t <- pQLeaf (atomThreadName "total") es
case reads t of
((x,_):_) -> do
n <- pQNode (atomThreadName "total") es
return InReplyTotal
{ replyToTotal = x
, replyToTotalOther = elAttribs n
}
_ -> fail "no parse"
pInReplyTo :: [XML.Element] -> Maybe InReplyTo
pInReplyTo es = do
t <- pQNode (atomThreadName "reply-to") es
case pQAttr (atomThreadName "ref") t of
Just ref ->
return InReplyTo
{ replyToRef = ref
, replyToHRef = pQAttr (atomThreadName "href") t
, replyToType = pQAttr (atomThreadName "type") t
, replyToSource = pQAttr (atomThreadName "source") t
, replyToOther = elAttribs t -- ToDo: snip out matched ones.
, replyToContent = elContent t
}
_ -> fail "no parse"
|
