beautifications
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Armin Friedl
parent
e9aaddc974
commit
77081e3437
1 changed files with 75 additions and 66 deletions
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@ -11,23 +11,41 @@ import qualified Text.Regex.TDFA as Tdfa
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---- Various ----
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import Data.Array
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import Data.String
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import Lens.Micro ((^.), _1, _2)
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import Lens.Micro ((^.), _1, _2)
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{---- Type Definitions ----}
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-- defines an attribute for a text slice
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data Fontification = FT { ftStart :: Int -- start index in string
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, ftEnd :: Int -- end index in string
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, ftAttr :: AttrName -- attribute name
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} deriving (Show)
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data Fontification = FT { ftStart :: Int -- start index in string
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, ftEnd :: Int -- end index in string
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, ftAttr :: AttrName -- attribute name
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} deriving (Show)
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type Fontifications = [Fontification]
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type Fontifier = (CheckString -> Fontifications)
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type Slice = (Int,Int)
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type Slices = [Slice]
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type MatchResult = [Tdfa.MatchArray]
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type CheckString = String
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type Regex = Tdfa.Regex
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{---- Infix Operators ----}
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infixl 9 §:
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(§:) :: (AttrName -> a) -> String -> a
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f §: s = f $ attrName s
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infixl 9 §~
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(§~) :: (Regex -> a) -> String -> a
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f §~ s = f $ Tdfa.makeRegex s
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-- reduces precedence of (.) to work
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-- more "naturally" in combination with
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-- §: / §~
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infixr 8 §.
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(§.) :: (b -> c) -> (a -> b) -> a -> c
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f §. s = f . s
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type Fontifications = [Fontification]
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type Fontifier = (CheckString -> Fontifications)
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type Slice = (Int,Int)
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type Slices = [Slice]
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type MatchResult = [Tdfa.MatchArray]
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type RegexStr = String
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type CheckString = String
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{---- Functions ----}
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@ -60,27 +78,35 @@ concatApply (f:fs) s = f s ++ concatApply fs s
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{--- Fontifier ---}
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{-- Regex-Based Fontifier --}
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-- TODO: most of the .+ don't actually allow any whitespace-like character
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-- maybe we should use \w/(:word:) instead?
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-- :: CheckString -> Fontifications
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assignments = slicesToFT (attrName "assignment") . matchStripCmts "\\**.+=.+;"
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guards = slicesToFT (attrName "guard") . matchStripCmts "\\[.+:.+\\]"
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returns = slicesToFT (attrName "return") . matchStripCmts "\\^.+;"
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strings = slicesToFT (attrName "string") . matchStripCmts "\"[^%]*\""
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comments = slicesToFT (attrName "comment") . matchAll "%.*"
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{- Regex-Based -}
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assignments = slicesToFT §: "assignment" §. matchStripCmts §~ "\\**.+=.+;"
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guards = slicesToFT §: "guard" §. matchStripCmts §~ "\\[.+:.+\\]"
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returns = slicesToFT §: "return" §. matchStripCmts §~ "\\^.+;"
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strings = slicesToFT §: "string" §. matchStripCmts §~ "\"[^%]*\""
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comments = slicesToFT §: "comment" §. matchAll §~ "%.*"
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{- Utility Functions (Regex) -}
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matchAll :: RegexStr -> CheckString -> Slices
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matchAll regexString bs = let regex = Tdfa.makeRegex regexString :: Tdfa.Regex
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in matchesToSlices $ Tdfa.matchAll regex bs
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{- Custom/Function-Based -}
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matchStripCmts :: RegexStr -> CheckString -> Slices
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untermStrings = slicesToFT §: "err_unterm" §. unterm §~ "\"[^%]*\"[^\\;]"
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untermAssignments s = slicesToFT §: "err_unterm" §. prune (assignments s) $ (unterm §~ "\"[^%]*\"[^\\;]") s
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untermReturns s = slicesToFT §: "err_unterm" §. prune (returns s) $ (unterm §~ "\\^[^;%]+[^\\;]") s
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mismatchedBrackets s = concatMap (mismatched §: "err_brackets" $ s) [('(',')'),('[',']'),('{','}')]
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{--- Utility Functions ---}
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{- Regex Utilities -}
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matchAll :: Regex -> CheckString -> Slices
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matchAll r s = matchesToSlices $ Tdfa.matchAll r s
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matchStripCmts :: Regex -> CheckString -> Slices
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matchStripCmts r s = stripComments $ matchAll r s
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where commentsFts = comments s
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stripComments [] = []
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@ -94,50 +120,34 @@ matchesToSlices (m:ms) = let match = m ! 0 -- get 1st elem of match array (this
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in (fst match, (fst match) + (snd match)): matchesToSlices ms
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{-- Custom/Function-Based Fontifier --}
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mismatchedBrackets :: CheckString -> Fontifications
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mismatchedBrackets s = concatMap fontifyMismatched pairs
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where fontifyMismatched = mismatched (attrName "err_brackets") s
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pairs = [('(',')'),('[',']'),('{','}')]
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{- Custom Fontifier Utilities -}
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mismatched :: AttrName -> CheckString -> (Char, Char) -> Fontifications
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mismatched attrName s (open, close) = slicesToFT attrName $ (fst orphans)++(snd orphans) -- (fst orphans) = open without close,
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mismatched attrName s (open, close) = slicesToFT attrName $ (fst orphans)++(snd orphans) -- (fst orphans) = open without close,
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where orphans = mismatched' s 0 ([],[]) -- (snd orphans) = close without open
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checkFts = strings s ++ comments s
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mismatched' [] _ ophs = ophs
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mismatched' (curChr:restStr) ix ophs
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| isFontified (ix,ix+1) checkFts = mismatched' restStr (ix+1) ophs -- already fontified? -> continue
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| curChr == open = mismatched' restStr (ix+1) ((ix, ix+1):(fst ophs), snd ophs) -- open? -> assume orphan until proven otherwise
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| curChr == close = case null (fst ophs) of
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True -> mismatched' restStr (ix+1) (fst ophs, (ix,ix+1):(snd ophs)) -- close but no orphaned open? -> close is surely an orphan
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False -> mismatched' restStr (ix+1) (tail (fst ophs), snd ophs) -- close and ophaned open exists? -> delete nearest orphaned open
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| otherwise = mismatched' restStr (ix+1) ophs -- neither open nor close? -> continue
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| alreadyFontified = proceedWith ophs
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| curChr == open = proceedWith addOrphanedOpen -- assume orphan until proven otherwise
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| curChr == close = proceedWith $ if orphanedOpenExists then adoptNearestOpen else addOrphanedClose
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| otherwise = proceedWith ophs
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-- try just reading the cases, ignore the where
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where proceedWith = mismatched' restStr (ix+1)
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addOrphanedOpen = ((ix,ix+1):(fst ophs), snd ophs) -- (ix,ix+1) = slice of curChr
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addOrphanedClose = (fst ophs, (ix,ix+1):(snd ophs))
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adoptNearestOpen = (tail (fst ophs), snd ophs) -- delete nearest orphaned open
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orphanedOpenExists = not $ null (fst ophs)
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alreadyFontified = isFontified (ix,ix+1) checkFts
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untermStrings :: CheckString -> Fontifications
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untermStrings = let regex = Tdfa.makeRegex ("\"[^%]*\"[^\\;]"::String) :: Tdfa.Regex
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in slicesToFT (attrName "err_unterm") . unterm regex
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untermAssignments :: CheckString -> Fontifications
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untermAssignments s = let regex = Tdfa.makeRegex ("\\**[^%]+=[^;%]+[^\\;]"::String) :: Tdfa.Regex
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in slicesToFT (attrName "err_unterm") . prune (assignments s) $ unterm regex s
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untermReturns :: CheckString -> Fontifications
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untermReturns s = let regex = Tdfa.makeRegex ("\\^[^;%]+[^\\;]"::String) :: Tdfa.Regex
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in slicesToFT (attrName "err_unterm") . prune (returns s) $ unterm regex s
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unterm :: Tdfa.Regex -> CheckString -> Slices
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unterm :: Regex -> CheckString -> Slices
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unterm regex s = lastChar untermed
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where commentsFts = comments s
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untermed = prune commentsFts $ matchesToSlices $ Tdfa.matchAll regex s
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mismatchedQuotes :: CheckString -> Fontifications
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mismatchedQuotes s = slicesToFT (attrName "err_quotes") $ firstChar untermed
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where regex = Tdfa.makeRegex ("\""::String) :: Tdfa.Regex
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matchedSlices = matchesToSlices $ Tdfa.matchAll regex s
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mismatchedQuotes s = slicesToFT §: "err_quotes" $ firstChar untermed
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where matchedSlices = matchesToSlices $ (Tdfa.matchAll §~ "\"") s
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untermed = let commentsFts = comments s; stringsFts = strings s
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in negPrune (commentsFts++stringsFts) matchedSlices
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negPrune _ [] = []
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@ -145,10 +155,10 @@ mismatchedQuotes s = slicesToFT (attrName "err_quotes") $ firstChar untermed
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| not $ isFontified curSlice checkFts = curSlice: negPrune checkFts slices
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| otherwise = negPrune checkFts slices
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{-- Utility Functions (General) --}
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{- General Fontification Utilities -}
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prune :: Fontifications -> Slices -> Slices
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prune _ [] = []
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@ -168,7 +178,6 @@ firstChar [] = []
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firstChar (curSlice:slices) = let start = fst curSlice
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in (start, start+1): firstChar slices
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slicesToFT :: AttrName -> Slices -> Fontifications
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slicesToFT attrName slices = slicesToFT' slices
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where slicesToFT' [] = []
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@ -180,13 +189,13 @@ isFontified :: Slice -> Fontifications -> Bool
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isFontified _ [] = False
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isFontified slice@(start,end) (f:fs)
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| ftStart f <= start && ftEnd f >= end = True
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| otherwise = isFontified slice fs
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| otherwise = isFontified slice fs
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-- checks if a slice penetrats a fontification
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-- checks if a slice penetrates a fontification
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penetratesFT :: Slice -> Fontifications -> Bool
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penetratesFT _ [] = False
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penetratesFT slice@(start,end) (f:fs)
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| ftStart f <= start && ftEnd f >= end = True -- yummie sandwich
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| ftStart f >= start && ftStart f <= end = True -- applied backstabbing
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| ftEnd f <= end && ftEnd f >= start = True -- Et tu, Brute? :(
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| otherwise = penetratesFT slice fs
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| otherwise = penetratesFT slice fs -- See ya at tha crossroads
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