module Rakka.Wiki.Parser
- ( wikiPage
+ ( CommandTypeOf
+ , wikiPage
)
where
+import Data.Maybe
+import Network.URI
import Rakka.Wiki
import Text.ParserCombinators.Parsec
-wikiPage :: Parser WikiPage
-wikiPage = do xs <- many wikiElement
- eof
- return xs
+type CommandTypeOf = String -> Maybe CommandType
-wikiElement :: Parser WikiElement
-wikiElement = ( try (blockElement >>= return . Block)
- <|>
- try (inlineElement >>= return . Inline)
- )
+wikiPage :: CommandTypeOf -> Parser WikiPage
+wikiPage cmdTypeOf
+ = do xs <- many (blockElement cmdTypeOf)
+ skipMany ( comment
+ <|>
+ (newline >> return ())
+ )
+ eof
+ return xs
-blockElement :: Parser BlockElement
-blockElement = ( try header
- <|>
- try emptyLine
- )
+blockElement :: CommandTypeOf -> Parser BlockElement
+blockElement cmdTypeOf
+ = try $ do skipMany ( comment
+ <|>
+ (newline >> return ())
+ )
+ foldr (<|>) pzero [ heading
+ , horizontalLine
+ , listElement cmdTypeOf
+ , definitionList cmdTypeOf
+ , pdata
+ , leadingSpaced cmdTypeOf
+ , paragraph cmdTypeOf
+ , blockCmd cmdTypeOf
+ ]
+
+
+heading :: Parser BlockElement
+heading = foldr (<|>) pzero (map heading' [1..5])
+ <?>
+ "heading"
+ where
+ heading' :: Int -> Parser BlockElement
+ heading' n = do try $ do count n (char '=')
+ notFollowedBy (char '=')
+ ws
+ x <- notFollowedBy (char '=') >> anyChar
+ xs <- manyTill anyChar (try $ ws >> ( count n (char '=')
+ <?>
+ ("trailing " ++ take n (repeat '='))
+ )
+ )
+ ws
+ eol
+ return (Heading n (x:xs))
+
+
+horizontalLine :: Parser BlockElement
+horizontalLine = try ( do count 4 (char '-')
+ many (char '-')
+ ws
+ eol
+ return HorizontalLine
+ )
+ <?>
+ "horizontal line"
+
+
+listElement :: CommandTypeOf -> Parser BlockElement
+listElement cmdTypeOf = listElement' [] >>= return . List
+ where
+ listElement' :: [Char] -> Parser ListElement
+ listElement' stack
+ = do t <- oneOf "*#"
+ ws
+ xs <- items (stack ++ [t])
+ return (ListElement (toType t) xs)
+
+ -- ListItem の終了條件は、
+ items :: [Char] -> Parser [ListItem]
+ items stack = do xs <- many1 $ inlineElement cmdTypeOf
+ nested <- option Nothing
+ $ try $ do skipMany comment
+ newline
+ string stack
+ listElement' stack >>= return . Just
+ rest <- items stack
+ return $ (map Right xs ++ map Left (catMaybes [nested])) : rest
+ <|>
+ (try $ do skipMany comment
+ newline
+ string stack
+ ws
+ items stack
+ )
+ <|>
+ return []
+
+ toType :: Char -> ListType
+ toType '*' = Bullet
+ toType '#' = Numbered
+
+
+definitionList :: CommandTypeOf -> Parser BlockElement
+definitionList cmdTypeOf = many1 definition >>= return . DefinitionList
+ where
+ definition :: Parser Definition
+ definition = do char ';'
+ ws
+ tHead <- inlineElement cmdTypeOf
+ tRest <- term
+ d <- description
+ return (Definition (tHead:tRest) d)
+ <?>
+ "definition list"
+
+ term :: Parser [InlineElement]
+ term = (char ':' >> ws >> return [])
+ <|>
+ (newline >> char ':' >> ws >> return [])
+ <|>
+ do x <- inlineElement cmdTypeOf
+ xs <- term
+ return (x:xs)
+ <?>
+ "term to be defined"
+
+ description :: Parser [InlineElement]
+ description = do x <- inlineElement cmdTypeOf
+ xs <- description
+ return (x:xs)
+ <|>
+ try ( do newline
+ char ':'
+ ws
+ xs <- description
+ return (Text "\n" : xs)
+ )
+ <|>
+ (newline >> return [])
+ <|>
+ (eof >> return [])
+ <?>
+ "description of term"
-header :: Parser BlockElement
-header = foldr (<|>) pzero (map (try . header') [1..5])
+pdata :: Parser BlockElement
+pdata = do try (string "<![PDATA[")
+ many (oneOf " \t\n")
+ x <- pdata'
+ return (Preformatted [Text x])
where
- header' :: Int -> Parser BlockElement
- header' n = do count n (char '=')
- notFollowedBy (char '=')
- ws
- x <- notFollowedBy (char '=') >> anyChar
- xs <- manyTill anyChar (try $ ws >> (count n (char '=')))
- ws
- eol
- return (Header n (x:xs))
+ pdata' :: Parser String
+ pdata' = do try (many (oneOf " \t\n") >> string "]]>")
+ return []
+ <|>
+ do x <- anyChar
+ xs <- pdata'
+ return (x:xs)
+
+
+leadingSpaced :: CommandTypeOf -> Parser BlockElement
+leadingSpaced cmdTypeOf = (char ' ' >> leadingSpaced' >>= return . Preformatted)
+ <?>
+ "leading space"
+ where
+ leadingSpaced' :: Parser [InlineElement]
+ leadingSpaced' = do x <- inlineElement cmdTypeOf
+ xs <- leadingSpaced'
+ return (x:xs)
+ <|>
+ try ( newline
+ >>
+ char ' '
+ >>
+ leadingSpaced'
+ >>=
+ return . (Text "\n" :)
+ )
+ <|>
+ return []
+
+
+blockCommand :: Parser BlockElement
+blockCommand = pzero -- not implemented
+
+
+paragraph :: CommandTypeOf -> Parser BlockElement
+paragraph cmdTypeOf = paragraph' >>= return . Paragraph
+ where
+ paragraph' :: Parser [InlineElement]
+ paragraph' = do x <- inlineElement cmdTypeOf
+ xs <- try ( do newline
+ eof
+ return []
+ -- \n で文字列が終はってゐたら、ここ
+ -- で終了。
+ )
+ <|>
+ try ( do newline
+ ((oneOf ('\n':blockSymbols) >> pzero) <|> return ())
+ ys <- (paragraph' <|> return [])
+ return (Text "\n" : ys)
+ -- \n があり、その次に \n または
+ -- blockSymbols があれば、fail して
+ -- 最初の newline を讀んだ所まで卷き
+ -- 戻す。
+ )
+ <|>
+ paragraph'
+ -- それ以外の場合は次の inlineElement から
+ -- を讀んで見る。但し一つも無くても良い。
+ <|>
+ return [] -- 全部失敗したらここで終了。
+ return (x:xs)
+
+
+blockCmd :: CommandTypeOf -> Parser BlockElement
+blockCmd cmdTypeOf
+ = (try $ do (tagName, tagAttrs) <- openTag
+ case cmdTypeOf tagName of
+ Just BlockCommandType
+ -> do xs <- contents
+ closeTag tagName
+ return $ BlockCmd $ BlockCommand {
+ bCmdName = tagName
+ , bCmdAttributes = tagAttrs
+ , bCmdContents = xs
+ }
+
+ Just InlineCommandType
+ -> pzero
+
+ _ -> return $ undefinedCmdErr tagName
+ )
+ <|>
+ (try $ do (tagName, tagAttrs) <- emptyTag
+ case cmdTypeOf tagName of
+ Just BlockCommandType
+ -> return $ BlockCmd $ BlockCommand {
+ bCmdName = tagName
+ , bCmdAttributes = tagAttrs
+ , bCmdContents = []
+ }
+
+ Just InlineCommandType
+ -> pzero
+
+ _ -> return $ undefinedCmdErr tagName
+ )
+ <?>
+ "block command"
+ where
+ contents :: Parser [BlockElement]
+ contents = do x <- blockElement cmdTypeOf
+ xs <- contents
+ return (x:xs)
+ <|>
+ (newline >> contents)
+ <|>
+ (comment >> contents)
+ <|>
+ return []
+
+ undefinedCmdErr :: String -> BlockElement
+ undefinedCmdErr name
+ = Div [("class", "error")]
+ [ Paragraph [Text ("The command `" ++ name ++ "' is not defined. " ++
+ "Make sure you haven't mistyped.")
+ ]
+ ]
-emptyLine :: Parser BlockElement
-emptyLine = newline >> return EmptyLine
+inlineElement :: CommandTypeOf -> Parser InlineElement
+inlineElement cmdTypeOf
+ = try $ do skipMany comment
+ foldr (<|>) pzero [ cdata
+ , apostrophes cmdTypeOf
+ , text
+ , objLink
+ , pageLink
+ , extLink
+ , inlineCmd cmdTypeOf
+ ]
-inlineElement :: Parser InlineElement
-inlineElement = text
+cdata :: Parser InlineElement
+cdata = try (string "<![CDATA[") >> cdata' >>= return . Text
+ where
+ cdata' :: Parser String
+ cdata' = do try (string "]]>")
+ return []
+ <|>
+ do x <- anyChar
+ xs <- cdata'
+ return (x:xs)
text :: Parser InlineElement
-text = do xs <- many1 (noneOf symbols)
- nl <- option "" (count 1 newline)
- return $ Text (xs ++ nl)
+text = ( char ':'
+ >>
+ many (noneOf ('\n':inlineSymbols))
+ >>=
+ return . Text . (':' :)
+ -- 定義リストとの關係上、コロンは先頭にしか來れない。
+ )
+ <|>
+ ( many1 (noneOf ('\n':inlineSymbols))
+ >>=
+ return . Text
+ )
+ <?>
+ "text"
+
+
+apostrophes :: CommandTypeOf -> Parser InlineElement
+apostrophes cmdTypeOf = foldr (<|>) pzero (map try [apos1, apos2, apos3, apos4, apos5])
+ where
+ apos1 = apos 1 >> return (Text "'")
+
+ apos2 = do apos 2
+ xs <- many1 $ inlineElement cmdTypeOf
+ apos 2
+ return (Italic xs)
+
+ apos3 = do apos 3
+ xs <- many1 $ inlineElement cmdTypeOf
+ apos 3
+ return (Bold xs)
+
+ apos4 = apos 4 >> return (Text "'")
+
+ apos5 = do apos 5
+ xs <- many1 $ inlineElement cmdTypeOf
+ apos 5
+ return (Italic [Bold xs])
+
+ apos :: Int -> Parser ()
+ apos n = count n (char '\'') >> notFollowedBy (char '\'')
+
+objLink :: Parser InlineElement
+objLink = do try (string "[[[")
+ page <- many1 (noneOf "|]")
+ text <- option Nothing
+ (char '|' >> many1 (satisfy (/= ']')) >>= return . Just)
+ string "]]]"
+ return $ ObjectLink page text
+ <?>
+ "object link"
-symbols :: [Char]
-symbols = "\n"
+pageLink :: Parser InlineElement
+pageLink = do try (string "[[")
+ page <- option Nothing
+ (many1 (noneOf "#|]") >>= return . Just)
+ fragment <- option Nothing
+ (char '#' >> many1 (noneOf "|]") >>= return . Just)
+ text <- option Nothing
+ (char '|' >> many1 (satisfy (/= ']')) >>= return . Just)
+
+ case (page, fragment) of
+ (Nothing, Nothing) -> pzero
+ (_, _) -> return ()
+
+ string "]]"
+ return $ PageLink page fragment text
+ <?>
+ "page link"
+
+
+extLink :: Parser InlineElement
+extLink = do char '['
+ uriStr <- many1 (noneOf " \t]")
+ skipMany (oneOf " \t")
+ text <- option Nothing
+ (many1 (noneOf "]") >>= return . Just)
+
+ case parseURI uriStr of
+ Just uri -> char ']' >> return (ExternalLink uri text)
+ Nothing -> pzero <?> "absolute URI"
+ <?>
+ "external link"
+
+
+inlineCmd :: CommandTypeOf -> Parser InlineElement
+inlineCmd cmdTypeOf
+ = (try $ do (tagName, tagAttrs) <- openTag
+ case cmdTypeOf tagName of
+ Just InlineCommandType
+ -> do xs <- contents
+ closeTag tagName
+ return $ InlineCmd $ InlineCommand {
+ iCmdName = tagName
+ , iCmdAttributes = tagAttrs
+ , iCmdContents = xs
+ }
+ _ -> pzero
+ )
+ <|>
+ (try $ do (tagName, tagAttrs) <- emptyTag
+ case cmdTypeOf tagName of
+ Just InlineCommandType
+ -> return $ InlineCmd $ InlineCommand {
+ iCmdName = tagName
+ , iCmdAttributes = tagAttrs
+ , iCmdContents = []
+ }
+ _ -> pzero
+ )
+ <?>
+ "inline command"
+ where
+ contents :: Parser [InlineElement]
+ contents = do x <- inlineElement cmdTypeOf
+ xs <- contents
+ return (x:xs)
+ <|>
+ (comment >> contents)
+ <|>
+ (newline >> contents >>= return . (Text "\n" :))
+ <|>
+ return []
+
+
+openTag :: Parser (String, [Attribute])
+openTag = try $ do char '<'
+ many space
+ name <- many1 letter
+ many space
+ attrs <- many $ do attr <- tagAttr
+ many space
+ return attr
+ char '>'
+ return (name, attrs)
+
+
+emptyTag :: Parser (String, [Attribute])
+emptyTag = try $ do char '<'
+ many space
+ name <- many1 letter
+ many space
+ attrs <- many $ do attr <- tagAttr
+ many space
+ return attr
+ char '/'
+ many space
+ char '>'
+ return (name, attrs)
+
+
+closeTag :: String -> Parser ()
+closeTag name = try $ do char '<'
+ many space
+ char '/'
+ many space
+ string name
+ many space
+ char '>'
+ return ()
+
+
+tagAttr :: Parser (String, String)
+tagAttr = do name <- many1 letter
+ char '='
+ char '"'
+ value <- many (satisfy (/= '"'))
+ char '"'
+ return (name, value)
+
+
+comment :: Parser ()
+comment = (try (string "<!--") >> skipTillEnd 1)
+ <?>
+ "comment"
+ where
+ skipTillEnd :: Int -> Parser ()
+ skipTillEnd level = ( (try (string "<!--") >> skipTillEnd (level + 1))
+ <|>
+ (try (string "-->") >> case level of
+ 1 -> return ()
+ n -> skipTillEnd (n - 1))
+ <|>
+ (anyChar >> skipTillEnd level)
+ )
+
+
+blockSymbols :: [Char]
+blockSymbols = " =-*#;<"
+
+
+inlineSymbols :: [Char]
+inlineSymbols = "<[:'"
-- white space
-ws :: Parser String
-ws = many (oneOf " \t")
+ws :: Parser ()
+ws = skipMany ( (oneOf " \t" >> return ())
+ <|>
+ comment
+ )
-- end of line
eol :: Parser ()
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