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|
--------------------------------------------------------------------
-- |
-- Module : Text.RSS1.Import
-- Copyright : (c) Galois, Inc. 2008
-- License : BSD3
--
-- Maintainer: Sigbjorn Finne <sof@galois.com>
-- Stability : provisional
-- Portability:
--
--------------------------------------------------------------------
module Text.RSS1.Import
( elementToFeed
) where
import Text.RSS1.Syntax
import Text.RSS1.Utils
import Text.XML.Light as XML
import Text.XML.Light.Proc as XML
import Text.DublinCore.Types
import Data.Maybe (mapMaybe, fromMaybe)
import Control.Monad (guard,mplus)
---
elementToFeed :: XML.Element -> Maybe Feed
elementToFeed e = do
guard (elName e == rdfName "RDF")
ver <- pAttr (Nothing,Nothing) "xmlns" e `mplus` rss10NS
ch <- pNode "channel" e >>= elementToChannel
let mbImg = pNode "image" e >>= elementToImage
let is = fromMaybe [] $ fmap elementToItems $ pNode "items" e
let mbTI = pNode "textinput" e >>= elementToTextInput
let ch1 = ch{channelItemURIs = is}
let its = pMany (rss10NS,Nothing) "item" elementToItem e
let es_rest = removeKnownElts e
let as_rest = removeKnownAttrs e
return Feed
{ feedVersion = ver
, feedChannel = ch1
, feedImage = mbImg
, feedItems = its
, feedTextInput = mbTI
, feedTopics = mapMaybe elementToTaxonomyTopic $ pQNodes (qualName (taxNS,taxPrefix) "topic") e
, feedOther = es_rest
, feedAttrs = as_rest
}
elementToItems :: XML.Element -> [URIString]
elementToItems e = seqLeaves e
elementToTextInput :: XML.Element -> Maybe TextInputInfo
elementToTextInput e = do
let es = children e
uri <- pAttr (rdfNS,rdfPrefix) "about" e
ti <- pQLeaf (rss10NS,Nothing) "title" e
desc <- pQLeaf (rss10NS,Nothing) "description" e
na <- pQLeaf (rss10NS,Nothing) "name" e
li <- pQLeaf (rss10NS,Nothing) "link" e
let dcs = mapMaybe elementToDC es
return $ TextInputInfo
{ textInputURI = uri
, textInputTitle = ti
, textInputDesc = desc
, textInputName = na
, textInputLink = li
, textInputDC = dcs
, textInputOther = es
, textInputAttrs = elAttribs e
}
elementToItem :: XML.Element -> Maybe Item
elementToItem e = do
guard (elName e == qualName (rss10NS,Nothing) "item")
let es = children e
uri <- pAttr (rdfNS,rdfPrefix) "about" e
ti <- pQLeaf (rss10NS,Nothing) "title" e
li <- pQLeaf (rss10NS,Nothing) "link" e
let desc= pQLeaf (rss10NS,Nothing) "description" e
let dcs = mapMaybe elementToDC es
let tos = fromMaybe [] (fmap bagLeaves $ pQNode (qualName (taxNS,taxPrefix) "topics") e)
let cs = mapMaybe elementToContent es
let es_other = removeKnownElts e
let as_other = removeKnownAttrs e
return Item
{ itemURI = uri
, itemTitle = ti
, itemLink = li
, itemDesc = desc
, itemDC = dcs
, itemTopics = tos
, itemContent = cs
, itemOther = es_other
, itemAttrs = as_other
}
elementToImage :: XML.Element -> Maybe Image
elementToImage e = do
let es = children e
let as = elAttribs e
uri <- pAttr (rdfNS,rdfPrefix) "about" e
ti <- pLeaf "title" e
ur <- pLeaf "url" e
li <- pLeaf "link" e
let dcs = mapMaybe elementToDC es
return Image
{ imageURI = uri
, imageTitle = ti
, imageURL = ur
, imageLink = li
, imageDC = dcs
, imageOther = es
, imageAttrs = as
}
elementToChannel :: XML.Element -> Maybe Channel
elementToChannel e = do
let es = children e
uri <- pAttr (rdfNS,rdfPrefix) "about" e
ti <- pLeaf "title" e
li <- pLeaf "link" e
de <- pLeaf "description" e
let mbImg = pLeaf "image" e
let is =
case fmap seqLeaves $ pNode "items" e of
Nothing -> []
Just ss -> ss
let tinp = pLeaf "textinput" e
let dcs = mapMaybe elementToDC es
let tos = fromMaybe [] (fmap bagLeaves $ pQNode (qualName (taxNS,taxPrefix) "topics") e)
let cs = mapMaybe elementToContent es
let es_other = removeKnownElts e
let as_other = removeKnownAttrs e
let def_chan =
Channel
{ channelURI = uri
, channelTitle = ti
, channelLink = li
, channelDesc = de
, channelImageURI = mbImg
, channelItemURIs = is
, channelTextInputURI = tinp
, channelDC = dcs
, channelUpdatePeriod = Nothing
, channelUpdateFreq = Nothing
, channelUpdateBase = Nothing
, channelContent = cs
, channelTopics = tos
, channelOther = es_other
, channelAttrs = as_other
}
return (addSyndication e def_chan)
addSyndication :: XML.Element -> Channel -> Channel
addSyndication e ch =
ch{ channelUpdatePeriod = fmap toUpdatePeriod $ pQLeaf (synNS,synPrefix) "updatePeriod" e
, channelUpdateFreq = fmap read $ pQLeaf (synNS,synPrefix) "updateFrequency" e
, channelUpdateBase = pQLeaf (synNS,synPrefix) "updateBase" e
}
where
toUpdatePeriod x =
case x of
"hourly" -> Update_Hourly
"daily" -> Update_Daily
"weekly" -> Update_Weekly
"monthly" -> Update_Monthly
"yearly" -> Update_Yearly
_ -> Update_Hourly -- ToDo: whine
elementToDC :: XML.Element -> Maybe DCItem
elementToDC e = do
guard (qURI (elName e) == dcNS)
let dcItem x = DCItem{dcElt=x,dcText=strContent e}
return $ dcItem $
case qName $ elName e of
"title" -> DC_Title
"creator" -> DC_Creator
"subject" -> DC_Subject
"description" -> DC_Description
"publisher" -> DC_Publisher
"contributor" -> DC_Contributor
"date" -> DC_Date
"type" -> DC_Type
"format" -> DC_Format
"identifier" -> DC_Identifier
"source" -> DC_Source
"language" -> DC_Language
"relation" -> DC_Relation
"coverage" -> DC_Coverage
"rights" -> DC_Rights
oth -> DC_Other oth
elementToTaxonomyTopic :: XML.Element -> Maybe TaxonomyTopic
elementToTaxonomyTopic e = do
guard (elName e == qualName (taxNS,taxPrefix) "topic")
let es = children e
uri <- pAttr (rdfNS,rdfPrefix) "about" e
li <- pQLeaf (taxNS,taxPrefix) "link" e
return TaxonomyTopic
{ taxonomyURI = uri
, taxonomyLink = li
, taxonomyTitle = pLeaf "title" e
, taxonomyDesc = pLeaf "description" e
, taxonomyTopics = fromMaybe [] (fmap bagLeaves $ pQNode (qualName (taxNS,taxPrefix) "topics") e)
, taxonomyDC = mapMaybe elementToDC es
, taxonomyOther = es
}
elementToContent :: XML.Element -> Maybe ContentInfo
elementToContent e = do
guard (elName e == qualName (conNS,conPrefix) "items")
return ContentInfo
{ contentURI = pAttr (rdfNS,rdfPrefix) "about" e
, contentFormat = pQLeaf (conNS,conPrefix) "format" e
, contentEncoding = pQLeaf (conNS,conPrefix) "encoding" e
, contentValue = pQLeaf (rdfNS,rdfPrefix) "value" e
}
bagLeaves :: XML.Element -> [URIString]
bagLeaves be =
mapMaybe
(\ e -> do
guard (elName e == qualName (rdfNS,rdfPrefix) "li")
pAttr (rdfNS,rdfPrefix) "resource" e `mplus`
fmap strContent (pQNode (qualName (rdfNS,rdfPrefix) "li") e))
(fromMaybe [] $ fmap children $ pQNode (qualName (rdfNS,rdfPrefix) "Bag") be)
{-
bagElements :: XML.Element -> [XML.Element]
bagElements be =
mapMaybe
(\ e -> do
guard (elName e == rdfName "li")
return e)
(fromMaybe [] $ fmap children $ pQNode (rdfName "Bag") be)
-}
seqLeaves :: XML.Element -> [URIString]
seqLeaves se =
mapMaybe
(\ e -> do
guard (elName e == rdfName "li")
return (strContent e))
(fromMaybe [] $ fmap children $ pQNode (rdfName "Seq") se)
|
