Permalink
Fetching contributors…
Cannot retrieve contributors at this time
608 lines (558 sloc) 31 KB
{-# LANGUAGE Arrows #-}
{-
ParseSyntaxFiles.hs processes a directory containing Kate
XML syntax highlighting definitions. For each xml file in
the directory, it creates a syntax highlighting parser
Text/Highlighting/Kate/Syntax/(name).hs.
Finally, it creates a module
Text/Highlighting/Kate/Syntax.hs with a wrapper around
all these modules.
Usage: runghc ParseSyntaxFiles.hs xml
Requires HXT.
-}
module Main where
import Text.XML.HXT.Core
import Control.Monad
import Data.List
import Data.Char (toUpper, toLower, isAlphaNum)
import System.Directory
import System.Environment
import System.FilePath
import Text.PrettyPrint
import Text.Printf (printf)
import Data.Char (ord)
import Text.Highlighting.Kate.Types
import qualified Data.ByteString as B
import Data.ByteString.UTF8 (fromString, toString)
import Text.Regex.Posix ((=~))
data SyntaxDefinition =
SyntaxDefinition { synLanguage :: String
, synAuthor :: String
, synVersion :: String
, synLicense :: String
, synExtensions :: String
, synCaseSensitive :: Bool
, synLists :: [(String, [String])]
, synContexts :: [SyntaxContext]
, synItemDatas :: [(String, String)]
, synKeywordAttr :: SyntaxKeywordAttr
} deriving (Read, Show)
data SyntaxKeywordAttr =
SyntaxKeywordAttr { keywordCaseSensitive :: Bool
, keywordDelims :: [Char]
} deriving (Read, Show)
data SyntaxContext =
SyntaxContext { contName :: String
, contAttribute :: String
, contLineEndContext :: String
, contLineBeginContext :: String
, contFallthrough :: Bool
, contFallthroughContext :: String
, contDynamic :: Bool
, contParsers :: [SyntaxParser]
} deriving (Read, Show)
data SyntaxParser =
SyntaxParser { parserType :: String
, parserAttribute :: String
, parserContext :: String
, parserLookAhead :: Bool
, parserIncludeAttrib :: Bool
, parserFirstNonSpace :: Bool
, parserColumn :: Maybe Int
, parserDynamic :: Bool
, parserString :: String -- could be a regex
, parserChar :: Char
, parserChar1 :: Char
, parserChildren :: [SyntaxParser]
} deriving (Read, Show)
-- | Converts a list of files (ending in .xml) and directories containing
-- .xml files into a list of .xml files.
argFiles :: [String] -> IO [String]
argFiles [] = error "Specify paths of xml files and/or directories."
argFiles args = do
let isXmlFile x = isSuffixOf ".xml" x
let (files, dirs) = partition isXmlFile args
dirContents <- forM dirs $ \dir -> do
dc <- getDirectoryContents dir
return $ map (combine dir) $ filter isXmlFile dc
return $ nub (files ++ concat dirContents)
libraryPath :: FilePath
libraryPath = joinPath ["Text", "Highlighting", "Kate"]
destDir :: FilePath
destDir = joinPath [libraryPath, "Syntax"]
main :: IO ()
main = do
files <- getArgs >>= argFiles
destDirExists <- doesDirectoryExist destDir
unless destDirExists $ createDirectory destDir
mapM_ processOneFile files
names <- (sort . map dropExtension . filter (isSuffixOf ".hs"))
`fmap` (getDirectoryContents destDir)
writeSyntaxFile names
writeCabalFile names
writeSyntaxFile :: [String] -> IO ()
writeSyntaxFile names = do
let syntaxFile = combine libraryPath (addExtension "Syntax" "hs")
putStrLn $ "Writing " ++ syntaxFile
-- Get all syntax files, not only the newly generated ones.
let imports = unlines $ map (\name ->
"import qualified Text.Highlighting.Kate.Syntax." ++ name ++
" as " ++ name) names
let cases = unlines $ map (\name ->
show (map toLower name) ++ " -> " ++ name ++ ".highlight")
names
let languageExtensions = "[" ++ (intercalate ", " $ map (\name ->
"(" ++ show name ++ ", " ++ name ++ ".syntaxExtensions)") names) ++ "]"
let languageFullNames = "[" ++ (intercalate ", " $ map (\name ->
"(" ++ show name ++ ", " ++
name ++ ".syntaxName)") names) ++ "]"
syntaxFileTemplate <- liftM toString $ B.readFile (syntaxFile <.> "in")
let filledTemplate = fillTemplate 0
[("imports",imports),
("languages",show names),
("supportedlanguages", intercalate ", " $ map (\x ->
"@" ++ map toLower x ++ "@") names),
("languageExtensions",languageExtensions),
("languageFullNames",languageFullNames),
("cases",cases)] syntaxFileTemplate
B.writeFile syntaxFile $ fromString filledTemplate
writeCabalFile :: [String] -> IO ()
writeCabalFile names = do
copyFile "highlighting-kate.cabal" "highlighting-kate.cabal.orig"
cabalLines <- lines `fmap` readFile "highlighting-kate.cabal.orig"
let (front,rest) = break (=~ "Text\\.Highlighting\\.Kate\\.Syntax\\.")
cabalLines
let end = dropWhile (=~ "Text\\.Highlighting\\.Kate\\.Syntax\\.") rest
let toMod n = replicate 21 ' ' ++ "Text.Highlighting.Kate.Syntax." ++ n
let newCabalLines = front ++ (map toMod names) ++ end
writeFile "highlighting-kate.cabal" $ unlines newCabalLines
putStrLn "Modified highlighting-kate.cabal."
putStrLn "Backed up original as highlighting-kate.cabal.orig."
isIncludeRules :: SyntaxParser -> Bool
isIncludeRules p =
parserType p == "IncludeRules" && "##" `isInfixOf` parserContext p
includeLangs :: SyntaxDefinition -> [String]
includeLangs syntax =
nub $ map (takeLang . parserContext) $
filter isIncludeRules $ concatMap contParsers $ synContexts syntax
takeLang :: String -> String
takeLang [] = []
takeLang ('#':'#':xs) = xs
takeLang (_:xs) = takeLang xs
processOneFile :: FilePath -> IO ()
processOneFile src = do
[syntax] <- runX $ application src
let name = nameFromPath src
let outFile = joinPath [libraryPath, "Syntax", addExtension name "hs"]
-- let includeLangs = nub $ filter (/= name) $ map (drop 2 . parserContext) $
-- filter isIncludeRules $ concatMap contParsers $ synContexts syntax
let includeImports = map (("import qualified " ++) . langNameToModule)
(filter (/= name) $ includeLangs syntax)
putStrLn $ "Writing " ++ outFile
B.writeFile outFile $ fromString $
"{- This module was generated from data in the Kate syntax\n\
\ highlighting file " ++ (takeFileName src) ++ ", version " ++
synVersion syntax ++ ", by " ++ synAuthor syntax ++ " -}\n\n" ++
"module Text.Highlighting.Kate.Syntax." ++ name ++ "\n " ++
"(highlight, parseExpression, syntaxName, syntaxExtensions)" ++
"\nwhere\n\
\import Text.Highlighting.Kate.Types\n\
\import Text.Highlighting.Kate.Common\n" ++
unlines includeImports ++
"import Text.ParserCombinators.Parsec hiding (State)\n\
\import Control.Monad.State\n\
\import Data.Char (isSpace)\n" ++
(if null (synLists syntax)
then "\n"
else "import qualified Data.Set as Set\n\n") ++
render (mkParser syntax) ++ "\n"
labelFor :: SyntaxDefinition -> String -> TokenType
labelFor syntax attr' =
case lookup attr' (synItemDatas syntax) of
Just "dsKeyword" -> KeywordTok
Just "dsDataType" -> DataTypeTok
Just "dsDecVal" -> DecValTok
Just "dsBaseN" -> BaseNTok
Just "dsFloat" -> FloatTok
Just "dsConstant" -> ConstantTok
Just "dsChar" -> CharTok
Just "dsSpecialChar" -> SpecialCharTok
Just "dsString" -> StringTok
Just "dsVerbatimString" -> VerbatimStringTok
Just "dsSpecialString" -> SpecialStringTok
Just "dsImport" -> ImportTok
Just "dsComment" -> CommentTok
Just "dsDocumentation" -> DocumentationTok
Just "dsAnnotation" -> AnnotationTok
Just "dsCommentVar" -> CommentVarTok
Just "dsOthers" -> OtherTok
Just "dsFunction" -> FunctionTok
Just "dsVariable" -> VariableTok
Just "dsControlFlow" -> ControlFlowTok
Just "dsOperator" -> OperatorTok
Just "dsBuiltIn" -> BuiltInTok
Just "dsExtension" -> ExtensionTok
Just "dsPreprocessor" -> PreprocessorTok
Just "dsAttribute" -> AttributeTok
Just "dsRegionMarker" -> RegionMarkerTok
Just "dsInformation" -> InformationTok
Just "dsWarning" -> WarningTok
Just "dsAlert" -> AlertTok
Just "dsError" -> ErrorTok
_ -> NormalTok
mkParser :: SyntaxDefinition -> Doc
mkParser syntax =
let name = text "-- | Full name of language." $$
text "syntaxName :: String" $$
text ("syntaxName = " ++ show (synLanguage syntax))
exts = text "-- | Filename extensions for this language." $$
text "syntaxExtensions :: String" $$
text ("syntaxExtensions = " ++ show (synExtensions syntax))
withAttr = text "withAttribute attr txt = do" $$ (nest 2 $
text "when (null txt) $ fail \"Parser matched no text\"" $$
text "updateState $ \\st -> st { synStPrevChar = last txt" $$
text " , synStPrevNonspace = synStPrevNonspace st || not (all isSpace txt) }" $$
text "return (attr, txt)")
parseExpression = text "-- | Parse an expression using appropriate local context." $$
text "parseExpression :: Maybe (String,String)" $$
text " -> KateParser Token" $$
text "parseExpression mbcontext = do" $$ (nest 2 $
text "(lang,cont) <- maybe currentContext return mbcontext" $$
text ("result <- parseRules (lang,cont)") $$
text "optional $ do eof" $$
text " updateState $ \\st -> st{ synStPrevChar = '\\n' }" $$
text " pEndLine" $$
text "return result")
-- defaultAttributes = text $ "defaultAttributes = " ++ (show $ map (\cont -> ((synLanguage syntax, contName cont), labelFor syntax $ contAttribute cont)) $ synContexts syntax)
-- Note: lineBeginContexts seems not to be used in any of the xml files
-- lineBeginContexts =
-- text $ "lineBeginContexts = " ++ (show $ map (\cont -> (contName cont, contLineBeginContext cont)) $ synContexts syntax)
startingContext = head (synContexts syntax)
-- contextNull = text $ "parseRules \"\" = parseRules " ++ show (synLanguage syntax, contName startingContext)
-- includeLangs = nub $ map (drop 2 . parserContext) $
-- filter isIncludeRules $
-- concatMap contParsers $ synContexts syntax
foreignContexts = vcat $ map (\l -> text ("parseRules (" ++ show l ++ ", _) = " ++ langNameToModule l ++ ".parseExpression Nothing")) (includeLangs syntax)
contextCatchAll = text $ "parseRules x = parseRules " ++ show (synLanguage syntax, contName startingContext) ++ " <|> fail (\"Unknown context\" ++ show x)"
contexts = map (mkRules syntax) $ synContexts syntax
initialContextStack = [(synLanguage syntax, contName startingContext)]
initState = text $ "startingState = " ++ show
defaultSyntaxState{
synStContexts = initialContextStack
, synStKeywordCaseSensitive =
keywordCaseSensitive (synKeywordAttr syntax) }
mainFunction = text $ "-- | Highlight source code using this syntax definition.\n\
\highlight :: String -> [SourceLine]\n\
\highlight input = evalState (mapM parseSourceLine $ lines input) startingState"
lineParser = text $ "parseSourceLine :: String -> State SyntaxState SourceLine\n\
\parseSourceLine = mkParseSourceLine (parseExpression Nothing)"
endLineParser = text "pEndLine = do" $$
(nest 2 $ text "updateState $ \\st -> st{ synStPrevNonspace = False }" $$
text "context <- currentContext" $$
text "contexts <- synStContexts `fmap` getState" $$
text "st <- getState" $$
text "if length contexts >= 2" $$
text " then case context of" $$
(nest 4 $ text "_ | synStContinuation st -> updateState $ \\st -> st{ synStContinuation = False }") $$
(nest 4 $ (vcat $ map (\cont -> text (show (synLanguage syntax, contName cont)) <> text " -> " <>
switchContext (synLanguage syntax, contLineEndContext cont) (<> text " >> ") <>
if "#pop" `isPrefixOf` (contLineEndContext cont)
then text "pEndLine"
else text "return ()") $ synContexts syntax) $$
(text $ "_ -> return ()")) $$
text " else return ()")
{- text "pushContext (synLanguage syntax, fromMaybe \"#stay\" $ lookup context lineBeginContexts)" $$ -}
-- we use 'words "blah blah2 blah3"' to keep ghc from inlining the list, which makes compiling take a long time
listDef (n, list) = text $ listName n ++ " = Set.fromList $ words $ " ++
show (if keywordCaseSensitive (synKeywordAttr syntax)
then unwords list
else map toLower (unwords list))
lists = vcat $ map listDef $ synLists syntax
regexDef re = text $ compiledRegexName re ++ " = compileRegex " ++ show (synCaseSensitive syntax) ++ " " ++ show re
regexes = vcat $ map regexDef $ nub $ [parserString x | x <- concatMap contParsers (synContexts syntax),
parserType x == "RegExpr", parserDynamic x == False]
in vcat $ intersperse (text "") $ [name, exts, mainFunction, lineParser, parseExpression, initState,
endLineParser, withAttr, lists, regexes
{- ,defaultAttributes , lineBeginContexts -}] ++ contexts ++ [foreignContexts, contextCatchAll]
mkAlternatives :: [Doc] -> Doc
mkAlternatives docs =
let contents = vcat $ intersperse (text "<|>") docs
in if length docs > 1
then char '(' <> contents <> char ')'
else contents
mkRules :: SyntaxDefinition -> SyntaxContext -> Doc
mkRules syntax context =
let ctx = (synLanguage syntax, contName context)
fallthroughParser = if contFallthrough context
then [parens (switchContext (synLanguage syntax, contFallthroughContext context) (<> text " >> ") <>
text "currentContext >>= parseRules")]
else [parens $ text $ "currentContext >>= \\x -> guard (x == " ++ show ctx ++ ") >> pDefault >>= withAttribute " ++ show (labelFor syntax (contAttribute context))]
in text ("parseRules " ++ show ctx ++ " =") $$
if null (contParsers context) && null fallthroughParser
then nest 2 (text "pzero")
else nest 2 $ mkAlternatives $ (map (mkSyntaxParser syntax context) $ contParsers context) ++ fallthroughParser
mkSyntaxParser :: SyntaxDefinition -> SyntaxContext -> SyntaxParser -> Doc
mkSyntaxParser syntax context parser =
let attr' = case parserAttribute parser of
"" -> labelFor syntax $ contAttribute context
x -> labelFor syntax x
mainParser = text $ case parserType parser of
"DetectChar" -> "pDetectChar " ++ show (parserDynamic parser) ++ " " ++ show (parserChar parser)
"Detect2Chars" -> "pDetect2Chars " ++ show (parserDynamic parser) ++ " " ++
show (parserChar parser) ++ " " ++ show (parserChar1 parser)
"AnyChar" -> "pAnyChar " ++ show (parserString parser)
"StringDetect" -> "pString " ++ show (parserDynamic parser) ++ " " ++ show (parserString parser)
"RegExpr" -> if parserDynamic parser
then "pRegExprDynamic " ++ show (parserString parser)
else "pRegExpr " ++ compiledRegexName (parserString parser)
"WordDetect" -> if parserDynamic parser
then "pRegExprDynamic " ++ wordRe
else "pRegExpr (compileRegex " ++ show caseSensitive ++ " " ++ show wordRe ++ ")"
where wordRe = "\\b" ++ concatMap esc (parserString parser) ++ "\\b"
esc c = if c `elem` "[]{}^$\\-*.+?"
then ['\\',c]
else [c]
caseSensitive = synCaseSensitive syntax
"keyword" -> "pKeyword " ++ show (keywordDelims $ synKeywordAttr syntax) ++ " " ++ list
where list = case lookup string (synLists syntax) of
Just _ -> listName string
Nothing -> "Set.empty"
string = parserString parser
"Int" -> "pInt"
"Float" -> "pFloat"
"HlCOct" -> "pHlCOct"
"HlCHex" -> "pHlCHex"
"HlCStringChar" -> "pHlCStringChar"
"HlCChar" -> "pHlCChar"
"RangeDetect" -> "pRangeDetect " ++ show (parserChar parser) ++ " " ++ show (parserChar1 parser)
"LineContinue" -> "pLineContinue"
"IncludeRules" ->
case break (=='#') $ parserContext parser of
(cont,'#':'#':lang) ->
langNameToModule lang ++ ".parseExpression (" ++
show (Just (lang, cont)) ++
if parserIncludeAttrib parser || attr' == NormalTok
then ")"
else ") >>= ((withAttribute " ++ show attr' ++ ") . snd)"
(cont,_) -> "parseRules " ++ show (synLanguage syntax, cont)
"DetectSpaces" -> "pDetectSpaces"
"DetectIdentifier" -> "pDetectIdentifier"
_ -> "pUnimplemented"
parserDoc = char '(' <>
(case (parserColumn parser) of
Just c -> text $ "pColumn " ++ show c ++ " >> "
_ -> empty) <>
(if parserFirstNonSpace parser
then text "pFirstNonSpace >> "
else empty) <>
if parserType parser == "IncludeRules"
then mainParser <> char ')'
else if parserLookAhead parser
then text "lookAhead (" <> mainParser <> char ')'
<> switchContext (synLanguage syntax, parserContext parser) (text " >> " <>)
<> text " >> currentContext >>= parseRules)"
else mainParser <> text " >>= withAttribute " <> text (show attr') <> char ')'
<> switchContext (synLanguage syntax, parserContext parser) (text " >>~ " <>)
childParsers = parserChildren parser
in char '(' <>
(if null childParsers
then parserDoc
else text "withChildren " <> parserDoc <> char ' ' <> (mkAlternatives $ map (mkSyntaxParser syntax context) childParsers)) <>
char ')'
switchContext :: Context -> (Doc -> Doc) -> Doc
switchContext (lang,next) finalizer =
case next of
x | "#pop" `isPrefixOf` x -> finalizer $
char '(' <> text (concat $ intersperse " >> "
$ replicate (length (filter (=='#') x)) "popContext") <> char ')'
"#stay" -> empty
"" -> empty
x -> finalizer $ text ("pushContext " ++ show (lang,x))
langNameToModule :: String -> String
langNameToModule str = "Text.Highlighting.Kate.Syntax." ++
case str of
"Alerts" -> "Alert"
"Alerts_indent" -> "Alert_indent"
"C++" -> "Cpp"
"CSS" -> "Css"
"Doxygen" -> "Doxygen"
"HTML" -> "Html"
"Javadoc" -> "Javadoc"
"JavaScript" -> "Javascript"
"LaTeX" -> "Latex"
"SQL (MySQL)" -> "SqlMysql"
"DoxygenLua" -> "Doxygenlua"
"reStructuredText" -> "Restructuredtext"
"ISO C++" -> "Isocpp"
"GCCExtensions" -> "Gcc"
x -> x
listName :: String -> String
listName n = "list_" ++ normalize n
compiledRegexName :: String -> String
compiledRegexName n = "regex_" ++ normalize n
normalize :: String -> String
normalize "" = ""
normalize (x:xs) | isAlphaNum x = x : normalize xs
normalize (' ':xs) = '_':normalize xs
normalize (x:xs) = printf "'%2x" (ord x) ++ normalize xs
capitalize :: String -> String
capitalize (x:xs) = toUpper x : xs
capitalize [] = []
nameFromPath :: FilePath -> String
nameFromPath = concat . map capitalize . words .
(map (\c -> if c == '-' then ' ' else c)) . takeFileName .
dropExtension
application :: String -> IOSArrow b SyntaxDefinition
application src
= readDocument [withValidate no, withInputEncoding utf8] src
>>>
multi (hasName "language")
>>>
extractSyntaxDefinition
extractSyntaxDefinition :: IOSArrow XmlTree SyntaxDefinition
extractSyntaxDefinition = proc x -> do
lang <- getAttrValue "name" -< x
author <- getAttrValue "author" -< x
version <- getAttrValue "version" -< x
license <- getAttrValue "license" -< x
sources <- getAttrValue "extensions" -< x
caseSensitive <- getAttrValue "casesensitive" -< x
itemdatas <- getItemDatas -< x
lists <- getLists -< x
contexts <- getContexts -< x
keywordAttr <- getKeywordAttrs -< x
returnA -< SyntaxDefinition { synLanguage = lang
, synAuthor = author
, synVersion = version
, synLicense = license
, synExtensions = sources
, synCaseSensitive = vBool True caseSensitive
, synLists = lists
, synContexts = contexts
, synItemDatas = itemdatas
, synKeywordAttr = if null keywordAttr
then defaultKeywordAttr
else head keywordAttr }
getItemDatas :: IOSArrow XmlTree [(String,String)]
getItemDatas = multi (hasName "itemDatas")
>>>
(listA $ getChildren
>>>
hasName "itemData"
>>>
getAttrValue "name" &&& getAttrValue "defStyleNum")
getLists :: IOSArrow XmlTree [(String, [String])]
getLists = listA $ multi (hasName "list")
>>>
getAttrValue "name" &&& getListContents
getListContents :: IOSArrow XmlTree [String]
getListContents = listA $ getChildren
>>>
hasName "item"
>>>
getChildren
>>>
getText
>>>
arr stripWhitespace
getContexts :: IOSArrow XmlTree [SyntaxContext]
getContexts = listA $ multi (hasName "context")
>>>
proc x -> do
name <- getAttrValue "name" -< x
attribute <- getAttrValue "attribute" -< x
lineEndContext <- getAttrValue "lineEndContext" -< x
lineBeginContext <- getAttrValue "lineBeginContext" -< x
fallthrough <- getAttrValue "fallthrough" -< x
fallthroughContext <- getAttrValue "fallthroughContext" -< x
dynamic <- getAttrValue "dynamic" -< x
parsers <- getParsers -< x
returnA -< SyntaxContext
{ contName = name
, contAttribute = attribute
, contLineEndContext = if null lineEndContext then "#stay" else lineEndContext
, contLineBeginContext = if null lineBeginContext then "#stay" else lineBeginContext
, contFallthrough = vBool False fallthrough
, contFallthroughContext = if null fallthroughContext then "#pop" else fallthroughContext
, contDynamic = vBool False dynamic
, contParsers = parsers }
getParsers :: IOSArrow XmlTree [SyntaxParser]
getParsers = listA $ getChildren
>>>
proc x -> do
name <- getName -< x
attribute <- getAttrValue "attribute" -< x
context <- getAttrValue "context" -< x
char0 <- getAttrValue "char" -< x
char1 <- getAttrValue "char1" -< x
str <- getAttrValue "String" -< x
includeAttrib <- getAttrValue "includeAttrib" -< x
lookahead <- getAttrValue "lookAhead" -< x
firstNonSpace <- getAttrValue "firstNonSpace" -< x
column <- getAttrValue "column" -< x
dynamic <- getAttrValue "dynamic" -< x
children <- getParsers -< x
let tildeRegex = name == "RegExpr" && length str > 0 && head str == '^'
returnA -< SyntaxParser
{ parserType = name
, parserAttribute = attribute
, parserContext = context
, parserLookAhead = vBool False lookahead
, parserIncludeAttrib = vBool False includeAttrib
, parserFirstNonSpace = vBool False firstNonSpace
, parserColumn = if tildeRegex
then Just 0
else if null column
then Nothing
else Just (read column)
, parserDynamic = vBool False dynamic
, parserString = if tildeRegex then drop 1 str else str
-- Note, some xml files have "\\" for a backslash,
-- others have "\". Not sure what the rules are, but
-- this covers both bases:
, parserChar = case char0 of
[c] -> c
_ -> read $ "'" ++ char0 ++ "'"
, parserChar1 = case char1 of
[c] -> c
_ -> read $ "'" ++ char1 ++ "'"
, parserChildren = children }
getKeywordAttrs :: IOSArrow XmlTree [SyntaxKeywordAttr]
getKeywordAttrs = listA $ multi $ hasName "keywords"
>>>
proc x -> do
caseSensitive <- getAttrValue "casesensitive" -< x
weakDelim <- getAttrValue "weakDeliminator" -< x
additionalDelim <- getAttrValue "additionalDeliminator" -< x
returnA -< SyntaxKeywordAttr
{ keywordCaseSensitive = vBool True caseSensitive
, keywordDelims = (standardDelims ++ additionalDelim) \\ weakDelim }
standardDelims :: [Char]
standardDelims = " \n\t.():!+,-<=>%&*/;?[]^{|}~\\"
defaultKeywordAttr :: SyntaxKeywordAttr
defaultKeywordAttr = SyntaxKeywordAttr { keywordCaseSensitive = True
, keywordDelims = standardDelims }
stripWhitespace :: String -> String
stripWhitespace = reverse . stripWhitespaceLeft . reverse . stripWhitespaceLeft
where stripWhitespaceLeft = dropWhile isWhitespace
isWhitespace x = x `elem` [' ', '\t', '\n']
vBool :: Bool -> String -> Bool
vBool defaultVal value = case value of
z | z `elem` ["true","yes","1"] -> True
z | z `elem` ["false","no","0"] -> False
_ -> defaultVal
-- | Fill template. The template variables in the source text are
-- surrounded by @'s: e.g., @myvar@.
fillTemplate :: Int -> [(String,String)] -> String -> String
fillTemplate _ _ [] = []
fillTemplate _ [] lst = lst
fillTemplate _ subs ('\n':xs) = '\n' : fillTemplate 0 subs xs
fillTemplate n subs ('@':xs) =
let (pref, suff) = break (=='@') xs
in if length pref > 0 && all isAlphaNum pref && length suff > 0
then case lookup pref subs of
Just v -> intercalate ('\n':replicate n ' ') (lines v) ++
fillTemplate (n + length v) subs (tail suff)
Nothing -> '@' : fillTemplate (n+1) subs xs
else '@' : fillTemplate (n+1) subs xs
fillTemplate n subs (x:xs) = x : fillTemplate (n+1) subs xs