+{-# LANGUAGE
+ Arrows
+ , OverloadedStrings
+ , TypeOperators
+ , UnicodeSyntax
+ , ViewPatterns
+ #-}
module Rakka.Wiki.Formatter
- ( formatWikiElements
+ ( formatWikiBlocks
)
where
+import Control.Arrow
+import Control.Arrow.ArrowIf
+import Control.Arrow.ArrowList
+import Control.Arrow.ArrowTree
+import Control.Arrow.Unicode
+import qualified Data.CaseInsensitive as CS
+import Data.Maybe
+import Data.Monoid.Unicode
+import Data.Text (Text)
+import qualified Data.Text as T
+import Network.URI hiding (fragment)
+import Prelude.Unicode
+import Rakka.Page
+import Rakka.Wiki
+import Text.XML.HXT.Arrow.XmlArrow
+import Text.XML.HXT.DOM.TypeDefs
-import Control.Arrow
-import Control.Arrow.ArrowList
-import Data.List
-import Rakka.Wiki
-import Text.XML.HXT.Arrow.XmlArrow
-import Text.XML.HXT.DOM.TypeDefs
+formatWikiBlocks :: (ArrowXml a, ArrowChoice a) => a (URI, [BlockElement]) XmlTree
+formatWikiBlocks
+ = proc (baseURI, blocks)
+ -> do block <- arrL id -< blocks
+ tree <- formatBlock -< (baseURI, block)
+ attachXHtmlNS -< tree
--- 複數の Inline を一つに纏める
-packParagraph :: [WikiElement] -> [Either BlockElement [InlineElement]]
-packParagraph elems = map pack grp
+formatElement :: (ArrowXml a, ArrowChoice a) => a (URI, Element) XmlTree
+formatElement
+ = proc (baseURI, e)
+ -> case e of
+ Block b -> formatBlock -< (baseURI, b)
+ Inline i -> formatInline -< (baseURI, i)
+
+formatBlock ∷ (ArrowXml (⇝), ArrowChoice (⇝)) ⇒ (URI, BlockElement) ⇝ XmlTree
+formatBlock
+ = proc (baseURI, block)
+ → case block of
+ Heading level text
+ → formatHeading ⤙ (level, text)
+
+ HorizontalLine
+ -> eelem "hr" -< ()
+
+ list@(List _ _)
+ -> formatListElement -< (baseURI, list)
+
+ DefinitionList list
+ -> formatDefinitionList -< (baseURI, list)
+
+ Preformatted inlines
+ -> formatPreformatted -< (baseURI, inlines)
+
+ Paragraph inlines
+ -> formatParagraph -< (baseURI, inlines)
+
+ Div attrs contents
+ -> formatElem "div" -< (baseURI, attrs, contents)
+
+ EmptyBlock
+ -> none -< ()
+
+ _ -> arr (error . ("formatBlock: unsupported BlockElement: " ++) . show) -< block
where
- grp :: [[WikiElement]]
- grp = groupBy criteria elems
+ formatElem :: (ArrowXml a, ArrowChoice a) =>
+ String
+ -> a (URI, [Attribute], [Element]) XmlTree
+ formatElem name
+ = proc (baseURI, attrs, contents)
+ -> ( eelem name
+ += ( arrL (fst . snd)
+ >>>
+ attrFromPair
+ )
+ += ( (arr fst &&& arrL (snd . snd))
+ >>>
+ formatElement
+ )
+ ) -< (baseURI, (attrs, contents))
- criteria :: WikiElement -> WikiElement -> Bool
- criteria (Inline _) (Inline _) = True
- criteria _ _ = False
- pack :: [WikiElement] -> Either BlockElement [InlineElement]
- pack (Block b : []) = Left b
- pack xs = Right [ case x of
- Inline i -> i | x <- xs ]
-
+formatHeading ∷ ArrowXml (⇝) ⇒ (Int, Text) ⇝ XmlTree
+formatHeading
+ = proc (level, T.unpack → text)
+ -> mkelem ("h" ⊕ show level)
+ [ sattr "id" text ]
+ [ txt text ] ⤛ ()
-formatWikiElements :: (ArrowXml a, ArrowChoice a) => a [WikiElement] XmlTree
-formatWikiElements
- = proc elems
- -> do chunk <- arrL id -< packParagraph elems
- case chunk of
- Left x -> formatBlock -< x
- Right xs -> formatParagraph -< xs
+formatListElement :: (ArrowXml a, ArrowChoice a) => a (URI, BlockElement) XmlTree
+formatListElement
+ = proc (baseURI, list)
+ -> let tag = case listType list of
+ Bullet -> "ul"
+ Numbered -> "ol"
+ in
+ ( eelem tag
+ += ( (constA baseURI &&& constL (listItems list))
+ >>>
+ formatListItem
+ )
+ ) -<< ()
+ where
+ formatListItem :: (ArrowXml a, ArrowChoice a) => a (URI, ListItem) XmlTree
+ formatListItem
+ = proc (baseURI, item)
+ -> eelem "li"
+ += ( (arr fst &&& arrL snd)
+ >>>
+ formatElement
+ ) -< (baseURI, item)
-formatBlock :: (ArrowXml a, ArrowChoice a) => a BlockElement XmlTree
-formatBlock
- = proc b
- -> do case b of
- Header level text
- -> formatHeader -< (level, text)
- EmptyLine
- -> none -< ()
+formatDefinitionList :: (ArrowXml a, ArrowChoice a) => a (URI, [Definition]) XmlTree
+formatDefinitionList
+ = proc (baseURI, list)
+ -> ( eelem "dl"
+ += ( (arr fst &&& arrL snd)
+ >>>
+ formatDefinition
+ )
+ ) -< (baseURI, list)
+ where
+ formatDefinition :: (ArrowXml a, ArrowChoice a) => a (URI, Definition) XmlTree
+ formatDefinition
+ = proc (baseURI, def)
+ -> ( eelem "dt"
+ += ( (arr fst &&& arrL (defTerm . snd))
+ >>>
+ formatInline
+ )
+ <+>
+ eelem "dd"
+ += ( (arr fst &&& arrL (defDesc . snd))
+ >>>
+ formatInline
+ )
+ ) -< (baseURI, def)
-formatHeader :: ArrowXml a => a (Int, String) XmlTree
-formatHeader
- = proc (level, text)
- -> selem ("h" ++ show level) [txt text] -<< ()
+formatPreformatted :: (ArrowXml a, ArrowChoice a) => a (URI, [InlineElement]) XmlTree
+formatPreformatted
+ = eelem "pre"
+ += ( (arr fst &&& arrL snd)
+ >>>
+ formatInline
+ )
-formatParagraph :: (ArrowXml a, ArrowChoice a) => a [InlineElement] XmlTree
-formatParagraph
- = proc xs
- -> do elem <- arrL id -< xs
- tree <- ( eelem "p"
- += formatInline ) -< elem
- returnA -< tree
+formatParagraph :: (ArrowXml a, ArrowChoice a) => a (URI, [InlineElement]) XmlTree
+formatParagraph
+ = eelem "p"
+ += ( (arr fst &&& arrL snd)
+ >>>
+ formatInline
+ )
-formatInline :: (ArrowXml a, ArrowChoice a) => a InlineElement XmlTree
+formatInline ∷ (ArrowXml (⇝), ArrowChoice (⇝)) ⇒ (URI, InlineElement) ⇝ XmlTree
formatInline
- = proc i
- -> do case i of
- Text text
- -> mkText -< text
+ = proc (baseURI, i)
+ → case i of
+ Text text
+ → mkText ⤙ T.unpack text
+
+ Italic contents
+ -> formatElem "i" -< (baseURI, [], contents)
+
+ Bold contents
+ -> formatElem "b" -< (baseURI, [], contents)
+
+ link@(ObjectLink _ _)
+ -> formatObjectLink -< (baseURI, link)
+
+ link@(PageLink _ _ _)
+ -> formatPageLink -< (baseURI, link)
+
+ link@(ExternalLink _ _)
+ -> formatExternalLink -< link
+
+ LineBreak attrs
+ -> formatElem "br" -< (baseURI, attrs, [])
+
+ Span attrs contents
+ -> formatElem "span" -< (baseURI, attrs, contents)
+
+ img@(Image _ _)
+ -> formatImage -< (baseURI, img)
+
+ Anchor attrs contents
+ -> formatElem "a" -< (baseURI, attrs, contents)
+
+ Input attrs
+ -> formatElem "input" -< (baseURI, attrs, [])
+
+ EmptyInline
+ -> none -< ()
+
+ _ -> arr (error . ("formatInline: unsupported InlineElement: " ++) . show) -< i
+ where
+ formatElem ∷ (ArrowXml (⇝), ArrowChoice (⇝)) ⇒
+ String
+ → (URI, [Attribute], [InlineElement]) ⇝ XmlTree
+ formatElem name
+ = proc (baseURI, attrs, contents)
+ → ( eelem name
+ += ( arrL (fst ∘ snd)
+ ⋙
+ attrFromPair
+ )
+ += ( (arr fst &&& arrL (snd . snd))
+ ⋙
+ formatInline
+ )
+ ) ⤙ (baseURI, (attrs, contents))
+
+attrFromPair ∷ ArrowXml (⇝) ⇒ Attribute ⇝ XmlTree
+attrFromPair = proc (T.unpack ∘ CS.original → name, T.unpack → value)
+ → attr name (txt value) ⤛ ()
+
+formatObjectLink ∷ ArrowXml (⇝) ⇒ (URI, InlineElement) ⇝ XmlTree
+formatObjectLink
+ = proc (baseURI, ObjectLink page text)
+ → let uri = mkObjectURI baseURI page
+ label = fromMaybe ("{" ⊕ page ⊕ "}") text
+ in
+ mkAnchor ⤙ (uri, label)
+
+formatPageLink ∷ ArrowXml (⇝) ⇒ (URI, InlineElement) ⇝ XmlTree
+formatPageLink
+ = proc (baseURI, PageLink page fragment text)
+ → let uri = case (page, fragment) of
+ (Just x, Just y) → mkPageFragmentURI baseURI x y
+ (Just x, Nothing) → mkPageURI baseURI x
+ (Nothing, Just y) → mkFragmentURI y
+ _ → (⊥)
+ dLabel = fromMaybe (∅) page ⊕ maybe (∅) (T.cons '#') fragment
+ label = fromMaybe dLabel text
+ in
+ mkAnchor ⤙ (uri, label)
+
+formatImage ∷ ArrowXml (⇝) ⇒ (URI, InlineElement) ⇝ XmlTree
+formatImage = proc (baseURI, Image src alt)
+ → let uri = case src of
+ Left u → u
+ Right name → mkObjectURI baseURI name
+ href = uriToString id uri ""
+ in
+ ( eelem "img"
+ += sattr "src" href
+ += ( case alt of
+ Just x → sattr "alt" (T.unpack x)
+ Nothing → none
+ )
+ ) ⤛ ()
+
+
+formatExternalLink ∷ ArrowXml (⇝) ⇒ InlineElement ⇝ XmlTree
+formatExternalLink
+ = proc (ExternalLink uri text)
+ → let href = uriToString id uri ""
+ label = fromMaybe (T.pack href) text
+ in
+ mkAnchor -< (uri, label)
+
+mkAnchor ∷ ArrowXml (⇝) ⇒ (URI, Text) ⇝ XmlTree
+mkAnchor = eelem "a"
+ += attr "href" (arr (flip (uriToString id) "" ∘ fst) ⋙ mkText)
+ += (arr (T.unpack ∘ snd) ⋙ mkText)
+
+attachXHtmlNS ∷ ArrowXml (⇝) ⇒ XmlTree ⇝ XmlTree
+attachXHtmlNS = processTopDown (changeQName attach `when` isElem)
+ where
+ attach ∷ QName → QName
+ attach = setNamespaceUri' (newXName "http://www.w3.org/1999/xhtml")
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