127 lines
4.6 KiB
Haskell
127 lines
4.6 KiB
Haskell
{-# LANGUAGE TemplateHaskell #-}
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{-# LANGUAGE DeriveDataTypeable #-}
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{-# OPTIONS_GHC -fno-warn-missing-fields #-} -- QuasiQuoter
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module Yesod.Routes.Parse
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( parseRoutes
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, parseRoutesFile
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, parseRoutesNoCheck
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, parseRoutesFileNoCheck
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, parseType
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) where
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import Language.Haskell.TH.Syntax
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import Data.Char (isUpper)
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import Language.Haskell.TH.Quote
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import qualified System.IO as SIO
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import Yesod.Routes.TH
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import Yesod.Routes.Overlap (findOverlapNames)
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-- | A quasi-quoter to parse a string into a list of 'Resource's. Checks for
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-- overlapping routes, failing if present; use 'parseRoutesNoCheck' to skip the
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-- checking. See documentation site for details on syntax.
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parseRoutes :: QuasiQuoter
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parseRoutes = QuasiQuoter { quoteExp = x }
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where
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x s = do
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let res = resourcesFromString s
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case findOverlapNames res of
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[] -> lift res
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z -> error $ "Overlapping routes: " ++ unlines (map show z)
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parseRoutesFile :: FilePath -> Q Exp
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parseRoutesFile = parseRoutesFileWith parseRoutes
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parseRoutesFileNoCheck :: FilePath -> Q Exp
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parseRoutesFileNoCheck = parseRoutesFileWith parseRoutesNoCheck
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parseRoutesFileWith :: QuasiQuoter -> FilePath -> Q Exp
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parseRoutesFileWith qq fp = do
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s <- qRunIO $ readUtf8File fp
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quoteExp qq s
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readUtf8File :: FilePath -> IO String
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readUtf8File fp = do
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h <- SIO.openFile fp SIO.ReadMode
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SIO.hSetEncoding h SIO.utf8_bom
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SIO.hGetContents h
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-- | Same as 'parseRoutes', but performs no overlap checking.
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parseRoutesNoCheck :: QuasiQuoter
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parseRoutesNoCheck = QuasiQuoter
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{ quoteExp = lift . resourcesFromString
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}
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-- | Convert a multi-line string to a set of resources. See documentation for
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-- the format of this string. This is a partial function which calls 'error' on
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-- invalid input.
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resourcesFromString :: String -> [ResourceTree String]
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resourcesFromString =
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fst . parse 0 . lines
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where
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parse _ [] = ([], [])
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parse indent (thisLine:otherLines)
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| length spaces < indent = ([], thisLine : otherLines)
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| otherwise = (this others, remainder)
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where
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spaces = takeWhile (== ' ') thisLine
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(others, remainder) = parse indent otherLines'
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(this, otherLines') =
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case takeWhile (/= "--") $ words thisLine of
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[pattern, constr] | last constr == ':' ->
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let (children, otherLines'') = parse (length spaces + 1) otherLines
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(pieces, Nothing) = piecesFromString $ drop1Slash pattern
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in ((ResourceParent (init constr) pieces children :), otherLines'')
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(pattern:constr:rest) ->
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let (pieces, mmulti) = piecesFromString $ drop1Slash pattern
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(attrs, rest') = takeAttrs rest
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disp = dispatchFromString rest' mmulti
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in ((ResourceLeaf (Resource constr pieces disp attrs):), otherLines)
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[] -> (id, otherLines)
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_ -> error $ "Invalid resource line: " ++ thisLine
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-- | Take attributes out of the list and put them in the first slot in the
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-- result tuple.
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takeAttrs :: [String] -> ([String], [String])
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takeAttrs =
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go id id
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where
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go x y [] = (x [], y [])
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go x y (('!':attr):rest) = go (x . (attr:)) y rest
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go x y (z:rest) = go x (y . (z:)) rest
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dispatchFromString :: [String] -> Maybe String -> Dispatch String
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dispatchFromString rest mmulti
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| null rest = Methods mmulti []
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| all (all isUpper) rest = Methods mmulti rest
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dispatchFromString [subTyp, subFun] Nothing =
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Subsite subTyp subFun
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dispatchFromString [_, _] Just{} =
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error "Subsites cannot have a multipiece"
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dispatchFromString rest _ = error $ "Invalid list of methods: " ++ show rest
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drop1Slash :: String -> String
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drop1Slash ('/':x) = x
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drop1Slash x = x
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piecesFromString :: String -> ([(CheckOverlap, Piece String)], Maybe String)
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piecesFromString "" = ([], Nothing)
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piecesFromString x =
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case (this, rest) of
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(Left typ, ([], Nothing)) -> ([], Just typ)
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(Left _, _) -> error "Multipiece must be last piece"
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(Right piece, (pieces, mtyp)) -> (piece:pieces, mtyp)
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where
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(y, z) = break (== '/') x
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this = pieceFromString y
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rest = piecesFromString $ drop 1 z
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parseType :: String -> Type
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parseType = ConT . mkName -- FIXME handle more complicated stuff
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pieceFromString :: String -> Either String (CheckOverlap, Piece String)
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pieceFromString ('#':'!':x) = Right $ (False, Dynamic x)
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pieceFromString ('#':x) = Right $ (True, Dynamic x)
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pieceFromString ('*':x) = Left x
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pieceFromString ('!':x) = Right $ (False, Static x)
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pieceFromString x = Right $ (True, Static x)
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