Working on new hand-written parser (because why not?)
Getty Ritter
9 years ago
| 1 | import Data.Char | |
| 2 | ||
| 3 | type Document = [Chunk] | |
| 4 | data Chunk | |
| 5 | = Text String | |
| 6 | | Tag String [Document] | |
| 7 | deriving (Eq, Show) | |
| 8 | ||
| 9 | isSpecial c = c `elem` "\\{}|" | |
| 10 | ||
| 11 | ||
| 12 | pText :: String -> (String, Chunk) | |
| 13 | pText = fmap Text . go | |
| 14 | where go ('\\':x:xs) | |
| 15 | | isSpecial x = fmap (x:) (go xs) | |
| 16 | go i@(x:xs) | |
| 17 | | isSpecial x = (i, "") | |
| 18 | | otherwise = fmap (x:) (go xs) | |
| 19 | go "" = ("", "") | |
| 20 | ||
| 21 | pTagName :: String -> (String, String) | |
| 22 | pTagName i@(x:xs) | |
| 23 | | isAlpha x = fmap (x:) (pTagName xs) | |
| 24 | | elem x "-_" = fmap (x:) (pTagName xs) | |
| 25 | | otherwise = (i, "") | |
| 26 | ||
| 27 | skipSpace :: String -> (String, ()) | |
| 28 | skipSpace i@(x:xs) | |
| 29 | | isSpace x = skipSpace xs | |
| 30 | | otherwise = (i, ()) | |
| 31 | ||
| 32 | pTag :: String -> (String, Chunk) | |
| 33 | pTag i = | |
| 34 | let (i', name) = pTagName i | |
| 35 | in case skipSpace i' of | |
| 36 | ('{':i'') -> fmap (Tag name) (pArgs i'') | |
| 37 | otherwise -> error "expected start of block" | |
| 38 | ||
| 39 | pArgs :: String -> (String, [Document]) | |
| 40 | pArgs ('|') | |
| 41 | ||
| 42 | pChunk :: String -> (String, Chunk) | |
| 43 | pChunk = undefined |