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|
-----------------------------------------------------------------------------
-- |
-- Module : Haddock.Backends.Html.Util
-- 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.Utils (
renderToString,
namedAnchor, linkedAnchor,
spliceURL, spliceURL',
groupId,
(<+>), (<=>), char,
keyword, punctuate,
braces, brackets, pabrackets, parens, parenList, ubxParenList,
arrow, comma, dcolon, dot, darrow, equals, forallSymbol, quote, promoQuote,
hsep, vcat,
collapseSection, collapseToggle, collapseControl,
) where
import Haddock.Utils
import Data.Maybe
import Text.XHtml hiding ( name, title, p, quote )
import qualified Text.XHtml as XHtml
import GHC ( SrcSpan(..), srcSpanStartLine, Name )
import Module ( Module, ModuleName, moduleName, moduleNameString )
import Name ( getOccString, nameOccName, isValOcc )
-- | Replace placeholder string elements with provided values.
--
-- Used to generate URL for customized external paths, usually provided with
-- @--source-module@, @--source-entity@ and related command-line arguments.
--
-- >>> spliceURL Nothing mmod mname Nothing "output/%{MODULE}.hs#%{NAME}"
-- "output/Foo.hs#foo"
spliceURL :: Maybe FilePath -> Maybe Module -> Maybe GHC.Name ->
Maybe SrcSpan -> String -> String
spliceURL mfile mmod = spliceURL' mfile (moduleName <$> mmod)
-- | Same as 'spliceURL' but takes 'ModuleName' instead of 'Module'.
spliceURL' :: Maybe FilePath -> Maybe ModuleName -> Maybe GHC.Name ->
Maybe SrcSpan -> String -> String
spliceURL' maybe_file maybe_mod maybe_name maybe_loc = run
where
file = fromMaybe "" maybe_file
mdl = case maybe_mod of
Nothing -> ""
Just m -> moduleNameString m
(name, kind) =
case maybe_name of
Nothing -> ("","")
Just n | isValOcc (nameOccName n) -> (escapeStr (getOccString n), "v")
| otherwise -> (escapeStr (getOccString n), "t")
line = case maybe_loc of
Nothing -> ""
Just span_ ->
case span_ of
RealSrcSpan span__ ->
show $ srcSpanStartLine span__
UnhelpfulSpan _ ->
error "spliceURL UnhelpfulSpan"
run "" = ""
run ('%':'M':rest) = mdl ++ run rest
run ('%':'F':rest) = file ++ run rest
run ('%':'N':rest) = name ++ run rest
run ('%':'K':rest) = kind ++ run rest
run ('%':'L':rest) = line ++ run rest
run ('%':'%':rest) = '%' : run rest
run ('%':'{':'M':'O':'D':'U':'L':'E':'}':rest) = mdl ++ run rest
run ('%':'{':'F':'I':'L':'E':'}':rest) = file ++ run rest
run ('%':'{':'N':'A':'M':'E':'}':rest) = name ++ run rest
run ('%':'{':'K':'I':'N':'D':'}':rest) = kind ++ run rest
run ('%':'{':'M':'O':'D':'U':'L':'E':'/':'.':'/':c:'}':rest) =
map (\x -> if x == '.' then c else x) mdl ++ run rest
run ('%':'{':'F':'I':'L':'E':'/':'/':'/':c:'}':rest) =
map (\x -> if x == '/' then c else x) file ++ run rest
run ('%':'{':'L':'I':'N':'E':'}':rest) = line ++ run rest
run (c:rest) = c : run rest
renderToString :: Bool -> Html -> String
renderToString debug html
| debug = renderHtml html
| otherwise = showHtml html
hsep :: [Html] -> Html
hsep [] = noHtml
hsep htmls = foldr1 (\a b -> a+++" "+++b) htmls
-- | Concatenate a series of 'Html' values vertically, with linebreaks in between.
vcat :: [Html] -> Html
vcat [] = noHtml
vcat htmls = foldr1 (\a b -> a+++br+++b) htmls
infixr 8 <+>
(<+>) :: Html -> Html -> Html
a <+> b = a +++ sep +++ b
where
sep = if isNoHtml a || isNoHtml b then noHtml else toHtml " "
-- | Join two 'Html' values together with a linebreak in between.
-- Has 'noHtml' as left identity.
infixr 8 <=>
(<=>) :: Html -> Html -> Html
a <=> b = a +++ sep +++ b
where
sep = if isNoHtml a then noHtml else br
keyword :: String -> Html
keyword s = thespan ! [theclass "keyword"] << toHtml s
equals, comma :: Html
equals = char '='
comma = char ','
char :: Char -> Html
char c = toHtml [c]
quote :: Html -> Html
quote h = char '`' +++ h +++ '`'
-- | Promoted type quote (e.g. @'[a, b]@, @'(a, b, c)@).
promoQuote :: Html -> Html
promoQuote h = char '\'' +++ h
parens, brackets, pabrackets, braces :: Html -> Html
parens h = char '(' +++ h +++ char ')'
brackets h = char '[' +++ h +++ char ']'
pabrackets h = toHtml "[:" +++ h +++ toHtml ":]"
braces h = char '{' +++ h +++ char '}'
punctuate :: Html -> [Html] -> [Html]
punctuate _ [] = []
punctuate h (d0:ds) = go d0 ds
where
go d [] = [d]
go d (e:es) = (d +++ h) : go e es
parenList :: [Html] -> Html
parenList = parens . hsep . punctuate comma
ubxParenList :: [Html] -> Html
ubxParenList = ubxparens . hsep . punctuate comma
ubxparens :: Html -> Html
ubxparens h = toHtml "(#" +++ h +++ toHtml "#)"
dcolon, arrow, darrow, forallSymbol :: Bool -> Html
dcolon unicode = toHtml (if unicode then "∷" else "::")
arrow unicode = toHtml (if unicode then "→" else "->")
darrow unicode = toHtml (if unicode then "⇒" else "=>")
forallSymbol unicode = if unicode then toHtml "∀" else keyword "forall"
dot :: Html
dot = toHtml "."
-- | Generate a named anchor
namedAnchor :: String -> Html -> Html
namedAnchor n = anchor ! [XHtml.name n]
linkedAnchor :: String -> Html -> Html
linkedAnchor n = anchor ! [href ('#':n)]
-- | generate an anchor identifier for a group
groupId :: String -> String
groupId g = makeAnchorId ("g:" ++ g)
--
-- A section of HTML which is collapsible.
--
-- | Attributes for an area that can be collapsed
collapseSection :: String -> Bool -> String -> [HtmlAttr]
collapseSection id_ state classes = [ identifier sid, theclass cs ]
where cs = unwords (words classes ++ [pick state "show" "hide"])
sid = "section." ++ id_
-- | Attributes for an area that toggles a collapsed area
collapseToggle :: String -> [HtmlAttr]
collapseToggle id_ = [ strAttr "onclick" js ]
where js = "toggleSection('" ++ id_ ++ "')";
-- | Attributes for an area that toggles a collapsed area,
-- and displays a control.
collapseControl :: String -> Bool -> String -> [HtmlAttr]
collapseControl id_ state classes =
[ identifier cid, theclass cs ] ++ collapseToggle id_
where cs = unwords (words classes ++ [pick state "collapser" "expander"])
cid = "control." ++ id_
pick :: Bool -> a -> a -> a
pick True t _ = t
pick False _ f = f
|
