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|
-----------------------------------------------------------------------------
-- |
-- Module : Haddock.Backends.Html.DocMarkup
-- Copyright : (c) Simon Marlow 2003-2006,
-- David Waern 2006-2009,
-- Mark Lentczner 2010
-- License : BSD-like
--
-- Maintainer : haddock@projects.haskell.org
-- Stability : experimental
-- Portability : portable
-----------------------------------------------------------------------------
module Haddock.Backends.Xhtml.DocMarkup (
docToHtml,
rdrDocToHtml,
origDocToHtml,
docToHtmlNoAnchors,
docElement, docSection, docSection_,
) where
import Control.Applicative ((<$>))
import Haddock.Backends.Xhtml.Names
import Haddock.Backends.Xhtml.Utils
import Haddock.Types
import Haddock.Utils
import Haddock.Doc (combineDocumentation)
import Text.XHtml hiding ( name, p, quote )
import Data.Maybe (fromMaybe)
import GHC
import Name
parHtmlMarkup :: Qualification -> Bool
-> (Bool -> a -> Html) -> DocMarkup a Html
parHtmlMarkup qual insertAnchors ppId = Markup {
markupEmpty = noHtml,
markupString = toHtml,
markupParagraph = paragraph,
markupAppend = (+++),
markupIdentifier = thecode . ppId insertAnchors,
markupIdentifierUnchecked = thecode . ppUncheckedLink qual,
markupModule = \m -> let (mdl,ref) = break (=='#') m
-- Accomodate for old style
-- foo\#bar anchors
mdl' = case reverse mdl of
'\\':_ -> init mdl
_ -> mdl
in ppModuleRef (mkModuleName mdl') ref,
markupWarning = thediv ! [theclass "warning"],
markupEmphasis = emphasize,
markupBold = strong,
markupMonospaced = thecode,
markupUnorderedList = unordList,
markupOrderedList = ordList,
markupDefList = defList,
markupCodeBlock = pre,
markupHyperlink = \(Hyperlink url mLabel)
-> if insertAnchors
then anchor ! [href url]
<< fromMaybe url mLabel
else toHtml $ fromMaybe url mLabel,
markupAName = \aname -> namedAnchor aname << "",
markupPic = \(Picture uri t) -> image ! ([src uri] ++ fromMaybe [] (return . title <$> t)),
markupProperty = pre . toHtml,
markupExample = examplesToHtml,
markupHeader = \(Header l t) -> makeHeader l t
}
where
makeHeader :: Int -> Html -> Html
makeHeader 1 mkup = h1 mkup
makeHeader 2 mkup = h2 mkup
makeHeader 3 mkup = h3 mkup
makeHeader 4 mkup = h4 mkup
makeHeader 5 mkup = h5 mkup
makeHeader 6 mkup = h6 mkup
makeHeader l _ = error $ "Somehow got a header level `" ++ show l ++ "' in DocMarkup!"
examplesToHtml l = pre (concatHtml $ map exampleToHtml l) ! [theclass "screen"]
exampleToHtml (Example expression result) = htmlExample
where
htmlExample = htmlPrompt +++ htmlExpression +++ toHtml (unlines result)
htmlPrompt = (thecode . toHtml $ ">>> ") ! [theclass "prompt"]
htmlExpression = (strong . thecode . toHtml $ expression ++ "\n") ! [theclass "userinput"]
-- | We use this intermediate type to transform the input 'Doc' tree
-- in an arbitrary way before rendering, such as grouping some
-- elements. This is effectivelly a hack to prevent the 'Doc' type
-- from changing if it is possible to recover the layout information
-- we won't need after the fact.
data Hack a id =
UntouchedDoc (DocH a id)
| CollapsingHeader (Header (DocH a id)) (DocH a id) Int (Maybe String)
| HackAppend (Hack a id) (Hack a id)
deriving Eq
-- | Group things under bold 'DocHeader's together.
toHack :: Int -- ^ Counter for header IDs which serves to assign
-- unique identifiers within the comment scope
-> Maybe String
-- ^ It is not enough to have unique identifier within the
-- scope of the comment: if two different comments have the
-- same ID for headers, the collapse/expand behaviour will act
-- on them both. This serves to make each header a little bit
-- more unique. As we can't export things with the same names,
-- this should work more or less fine: it is in fact the
-- implicit assumption the collapse/expand mechanism makes for
-- things like ‘Instances’ boxes.
-> [DocH a id] -> Hack a id
toHack _ _ [] = UntouchedDoc DocEmpty
toHack _ _ [x] = UntouchedDoc x
toHack n nm (DocHeader (Header l (DocBold x)):xs) =
let -- Header with dropped bold
h = Header l x
-- Predicate for takeWhile, grab everything including ‘smaller’
-- headers
p (DocHeader (Header l' _)) = l' > l
p _ = True
-- Stuff ‘under’ this header
r = takeWhile p xs
-- Everything else that didn't make it under
r' = drop (length r) xs
app y [] = y
app y ys = HackAppend y (toHack (n + 1) nm ys)
in case r of
-- No content under this header
[] -> CollapsingHeader h DocEmpty n nm `app` r'
-- We got something out, stitch it back together into one chunk
y:ys -> CollapsingHeader h (foldl DocAppend y ys) n nm `app` r'
toHack n nm (x:xs) = HackAppend (UntouchedDoc x) (toHack n nm xs)
-- | Remove ‘top-level’ 'DocAppend's turning them into a flat list.
-- This lends itself much better to processing things in order user
-- might look at them, such as in 'toHack'.
flatten :: DocH a id -> [DocH a id]
flatten (DocAppend x y) = flatten x ++ flatten y
flatten x = [x]
-- | Generate the markup needed for collapse to happen. For
-- 'UntouchedDoc' and 'HackAppend' we do nothing more but
-- extract/append the underlying 'Doc' and convert it to 'Html'. For
-- 'CollapsingHeader', we attach extra info to the generated 'Html'
-- that allows us to expand/collapse the content.
hackMarkup :: DocMarkup id Html -> Hack (ModuleName, OccName) id -> Html
hackMarkup fmt h = case h of
UntouchedDoc d -> markup fmt d
CollapsingHeader (Header lvl titl) par n nm ->
let id_ = makeAnchorId $ "ch:" ++ fromMaybe "noid:" nm ++ show n
col' = collapseControl id_ False "caption"
instTable = (thediv ! collapseSection id_ False [] <<)
lvs = zip [1 .. ] [h1, h2, h3, h4, h5, h6]
getHeader = fromMaybe caption (lookup lvl lvs)
subCation = getHeader ! col' << markup fmt titl
in (subCation +++) . instTable $ markup fmt par
HackAppend d d' -> markupAppend fmt (hackMarkup fmt d) (hackMarkup fmt d')
-- | Goes through 'hackMarkup' to generate the 'Html' rather than
-- skipping straight to 'markup': this allows us to employ XHtml
-- specific hacks to the tree before first.
markupHacked :: DocMarkup id Html
-> Maybe String
-> Doc id
-> Html
markupHacked fmt n = hackMarkup fmt . toHack 0 n . flatten
-- If the doc is a single paragraph, don't surround it with <P> (this causes
-- ugly extra whitespace with some browsers). FIXME: Does this still apply?
docToHtml :: Maybe String -- ^ Name of the thing this doc is for. See
-- comments on 'toHack' for details.
-> Qualification -> Doc DocName -> Html
docToHtml n qual = markupHacked fmt n . cleanup
where fmt = parHtmlMarkup qual True (ppDocName qual Raw)
-- | Same as 'docToHtml' but it doesn't insert the 'anchor' element
-- in links. This is used to generate the Contents box elements.
docToHtmlNoAnchors :: Maybe String -- ^ See 'toHack'
-> Qualification -> Doc DocName -> Html
docToHtmlNoAnchors n qual = markupHacked fmt n . cleanup
where fmt = parHtmlMarkup qual False (ppDocName qual Raw)
origDocToHtml :: Qualification -> Doc Name -> Html
origDocToHtml qual = markupHacked fmt Nothing . cleanup
where fmt = parHtmlMarkup qual True (const $ ppName Raw)
rdrDocToHtml :: Qualification -> Doc RdrName -> Html
rdrDocToHtml qual = markupHacked fmt Nothing . cleanup
where fmt = parHtmlMarkup qual True (const ppRdrName)
docElement :: (Html -> Html) -> Html -> Html
docElement el content_ =
if isNoHtml content_
then el ! [theclass "doc empty"] << spaceHtml
else el ! [theclass "doc"] << content_
docSection :: Maybe Name -- ^ Name of the thing this doc is for
-> Qualification -> Documentation DocName -> Html
docSection n qual = maybe noHtml (docSection_ n qual) . combineDocumentation
docSection_ :: Maybe Name -- ^ Name of the thing this doc is for
-> Qualification -> Doc DocName -> Html
docSection_ n qual =
(docElement thediv <<) . docToHtml (getOccString <$> n) qual
cleanup :: Doc a -> Doc a
cleanup = markup fmtUnParagraphLists
where
-- If there is a single paragraph, then surrounding it with <P>..</P>
-- can add too much whitespace in some browsers (eg. IE). However if
-- we have multiple paragraphs, then we want the extra whitespace to
-- separate them. So we catch the single paragraph case and transform it
-- here. We don't do this in code blocks as it eliminates line breaks.
unParagraph :: Doc a -> Doc a
unParagraph (DocParagraph d) = d
unParagraph doc = doc
fmtUnParagraphLists :: DocMarkup a (Doc a)
fmtUnParagraphLists = idMarkup {
markupUnorderedList = DocUnorderedList . map unParagraph,
markupOrderedList = DocOrderedList . map unParagraph
}
|
