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Replace.lhs
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Replace.lhs
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\begin{code}
{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE QuasiQuotes #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE FlexibleInstances #-}
module Text.RE.Types.Replace
( Replace(..)
, ReplaceMethods(..)
, replaceMethods
, Context(..)
, Location(..)
, isTopLocation
, replace
, replaceAll
, replaceAllCaptures
, replaceAllCaptures_
, replaceAllCapturesM
, replaceCaptures
, replaceCaptures_
, replaceCapturesM
, expandMacros
, expandMacros'
) where
import Control.Applicative
import Data.Array
import qualified Data.ByteString.Char8 as B
import qualified Data.ByteString.Lazy.Char8 as LBS
import Data.Char
import qualified Data.Foldable as F
import Data.Functor.Identity
import qualified Data.HashMap.Strict as HM
import Data.Maybe
import Data.Monoid
import qualified Data.Sequence as S
import qualified Data.Text as T
import qualified Data.Text.Encoding as TE
import qualified Data.Text.Lazy as LT
import Prelude.Compat
import Text.Heredoc
import Text.RE.Types.Capture
import Text.RE.Types.CaptureID
import Text.RE.Types.Match
import Text.RE.Types.Matches
import Text.RE.Types.Options
import Text.Read
import Text.Regex.TDFA
import Text.Regex.TDFA.Text()
import Text.Regex.TDFA.Text.Lazy()
\end{code}
\begin{code}
-- | Replace provides the missing methods needed to replace the matched
-- text; lengthE is the minimum implementation
class (Show a,Eq a,Ord a,Extract a,Monoid a) => Replace a where
-- | length function for a
lengthE :: a -> Int
-- | inject String into a
packE :: String -> a
-- | project a onto a String
unpackE :: a -> String
-- | inject into Text
textifyE :: a -> T.Text
-- | project Text onto a
detextifyE :: T.Text -> a
-- | split into lines
linesE :: a -> [a]
-- | concatenate a list of lines
unlinesE :: [a] -> a
-- | append a newline
appendNewlineE :: a -> a
-- | apply a substitution function to a Capture
substE :: (a->a) -> Capture a -> a
-- | convert a template containing $0, $1, etc., in the first
-- argument, into a 'phi' replacement function for use with
-- replaceAllCaptures and replaceCaptures
parseTemplateE :: a -> Match a -> Location -> Capture a -> Maybe a
textifyE = T.pack . unpackE
detextifyE = packE . T.unpack
appendNewlineE = (<> packE "\n")
substE f m@Capture{..} =
capturePrefix m <> f capturedText <> captureSuffix m
\end{code}
\begin{code}
-- | a selction of the Replace methods can be encapsulated with ReplaceMethods
-- for the higher-order replacement functions
data ReplaceMethods a =
ReplaceMethods
{ methodLength :: a -> Int
, methodSubst :: (a->a) -> Capture a -> a
}
-- | replaceMethods encapsulates ReplaceMethods a from a Replace a context
replaceMethods :: Replace a => ReplaceMethods a
replaceMethods =
ReplaceMethods
{ methodLength = lengthE
, methodSubst = substE
}
\end{code}
\begin{code}
-- | @Context@ specifies which contexts the substitutions should be applied
data Context
= TOP -- ^ substitutions should be applied to the top-level only,
-- the text that matched the whole RE
| SUB -- ^ substitutions should only be applied to the text
-- captured by bracketed sub-REs
| ALL -- ^ the substitution function should be applied to all
-- captures, the top level and the sub-expression captures
deriving (Show)
-- | the @Location@ information passed into the substitution function
-- specifies which sub-expression is being substituted
data Location =
Location
{ locationMatch :: Int
-- ^ the zero-based, i-th string to be matched,
-- when matching all strings, zero when only the
-- first string is being matched
, locationCapture :: CaptureOrdinal
-- ^ 0, when matching the top-level string
-- matched by the whole RE, 1 for the top-most,
-- left-most redex captured by bracketed
-- sub-REs, etc.
}
deriving (Show)
\end{code}
\begin{code}
-- | True iff the location references a complete match
-- (i.e., not a bracketed capture)
isTopLocation :: Location -> Bool
isTopLocation = (==0) . locationCapture
\end{code}
\begin{code}
-- | replace all with a template, $0 for whole text, $1 for first
-- capture, etc.
replaceAll :: Replace a
=> a
-> Matches a
-> a
replaceAll tpl ac = replaceAllCaptures TOP (parseTemplateE tpl) ac
\end{code}
\begin{code}
-- | substitutes using a function that takes the full Match
-- context and returns the same replacement text as the _phi_phi
-- context.
replaceAllCaptures :: Replace a
=> Context
-> (Match a->Location->Capture a->Maybe a)
-> Matches a
-> a
\end{code}
\begin{code}
replaceAllCaptures = replaceAllCaptures_ replaceMethods
\end{code}
\begin{code}
-- | replaceAllCaptures_ is like like replaceAllCaptures but takes the
-- Replace methods through the ReplaceMethods argument
replaceAllCaptures_ :: Extract a
=> ReplaceMethods a
-> Context
-> (Match a->Location->Capture a->Maybe a)
-> Matches a
-> a
replaceAllCaptures_ s ctx phi ac =
runIdentity $ replaceAllCapturesM s ctx (lift_phi phi) ac
\end{code}
\begin{code}
-- | replaceAllCapturesM is just a monadically generalised version of
-- replaceAllCaptures_
replaceAllCapturesM :: (Extract a,Monad m)
=> ReplaceMethods a
-> Context
-> (Match a->Location->Capture a->m (Maybe a))
-> Matches a
-> m a
replaceAllCapturesM r ctx phi_ Matches{..} =
replaceCapturesM r ALL phi $ Match matchesSource cnms arr
where
phi _ (Location _ i) = case arr_c!i of
Just caps -> phi_ caps . uncurry Location $ arr_i ! i
Nothing -> const $ return Nothing
arr_c = listArray bds $
concat $
[ repl (rangeSize $ bounds $ matchArray cs) cs
| cs <- allMatches
]
arr_i = listArray bds j_ks
arr = listArray bds $
[ arr_ ! k
| arr_ <- map matchArray allMatches
, k <- indices arr_
]
bds = (0,CaptureOrdinal $ length j_ks-1)
j_ks =
[ (j,k)
| (j,arr_) <- zip [0..] $ map matchArray allMatches
, k <- indices arr_
]
repl 0 _ = []
repl n x = case ctx of
TOP -> Just x : replicate (n-1) Nothing
SUB -> Nothing : replicate (n-1) (Just x)
ALL -> replicate n $ Just x
cnms = fromMaybe noCaptureNames $ listToMaybe $ map captureNames allMatches
\end{code}
\begin{code}
-- | replace with a template containing $0 for whole text,
-- $1 for first capture, etc.
replace :: Replace a
=> Match a
-> a
-> a
replace c tpl = replaceCaptures TOP (parseTemplateE tpl) c
\end{code}
\begin{code}
-- | substitutes using a function that takes the full Match
-- context and returns the same replacement text as the _phi_phi
-- context.
replaceCaptures :: Replace a
=> Context
-> (Match a->Location->Capture a->Maybe a)
-> Match a
-> a
replaceCaptures = replaceCaptures_ replaceMethods
\end{code}
\begin{code}
-- | replaceCaptures_ is like replaceCaptures but takes the Replace methods
-- through the ReplaceMethods argument
replaceCaptures_ :: Extract a
=> ReplaceMethods a
-> Context
-> (Match a->Location->Capture a->Maybe a)
-> Match a
-> a
replaceCaptures_ s ctx phi caps =
runIdentity $ replaceCapturesM s ctx (lift_phi phi) caps
\end{code}
\begin{code}
-- | replaceCapturesM is just a monadically generalised version of
-- replaceCaptures_
replaceCapturesM :: (Monad m,Extract a)
=> ReplaceMethods a
-> Context
-> (Match a->Location->Capture a->m (Maybe a))
-> Match a
-> m a
replaceCapturesM ReplaceMethods{..} ctx phi_ caps@Match{..} = do
(hay',_) <- foldr sc (return (matchSource,[])) $
zip [0..] $ elems matchArray
return hay'
where
sc (i,cap0) act = do
(hay,ds) <- act
let ndl = capturedText cap
cap = adj hay ds cap0
mb <- phi i cap
case mb of
Nothing -> return (hay,ds)
Just ndl' ->
return
( methodSubst (const ndl') cap
, (captureOffset cap,len'-len) : ds
)
where
len' = methodLength ndl'
len = methodLength ndl
adj hay ds cap =
Capture
{ captureSource = hay
, capturedText = before len $ after off0 hay
, captureOffset = off0
, captureLength = len
}
where
len = len0 + sum
[ delta
| (off,delta) <- ds
, off < off0 + len0
]
len0 = captureLength cap
off0 = captureOffset cap
phi i cap = case ctx of
TOP | i/=0 -> return Nothing
SUB | i==0 ->return Nothing
_ ->
case not $ hasCaptured cap of
True -> return Nothing
False -> phi_ caps (Location 0 i) cap
\end{code}
\begin{code}
-- the Replace instances
instance Replace [Char] where
lengthE = length
packE = id
unpackE = id
textifyE = T.pack
detextifyE = T.unpack
linesE = lines
unlinesE = unlines
appendNewlineE = (<>"\n")
parseTemplateE = parseTemplateE' id
instance Replace B.ByteString where
lengthE = B.length
packE = B.pack
unpackE = B.unpack
textifyE = TE.decodeUtf8
detextifyE = TE.encodeUtf8
linesE = B.lines
unlinesE = B.unlines
appendNewlineE = (<>"\n")
parseTemplateE = parseTemplateE' B.unpack
instance Replace LBS.ByteString where
lengthE = fromEnum . LBS.length
packE = LBS.pack
unpackE = LBS.unpack
textifyE = TE.decodeUtf8 . LBS.toStrict
linesE = LBS.lines
unlinesE = LBS.unlines
detextifyE = LBS.fromStrict . TE.encodeUtf8
appendNewlineE = (<>"\n")
parseTemplateE = parseTemplateE' LBS.unpack
instance Replace (S.Seq Char) where
lengthE = S.length
packE = S.fromList
unpackE = F.toList
linesE = map packE . lines . unpackE
unlinesE = packE . unlines . map unpackE
parseTemplateE = parseTemplateE' F.toList
instance Replace T.Text where
lengthE = T.length
packE = T.pack
unpackE = T.unpack
textifyE = id
detextifyE = id
linesE = T.lines
unlinesE = T.unlines
appendNewlineE = (<>"\n")
parseTemplateE = parseTemplateE' T.unpack
instance Replace LT.Text where
lengthE = fromEnum . LT.length
packE = LT.pack
unpackE = LT.unpack
textifyE = LT.toStrict
detextifyE = LT.fromStrict
linesE = LT.lines
unlinesE = LT.unlines
appendNewlineE = (<>"\n")
parseTemplateE = parseTemplateE' LT.unpack
\end{code}
\begin{code}
-- | expand all of the @{..} macros in the RE in the argument String
-- according to the Macros argument, preprocessing the RE String
-- according to the Mode argument (used internally)
expandMacros :: (r->String) -> Macros r -> String -> String
expandMacros x_src hm s =
case HM.null hm of
True -> s
False -> expandMacros' (fmap x_src . flip HM.lookup hm) s
\end{code}
\begin{code}
-- | expand the @{..} macos in the argument string using the given
-- function
expandMacros' :: (MacroID->Maybe String) -> String -> String
expandMacros' lu = fixpoint e_m
where
e_m re_s = replaceAllCaptures TOP phi $ re_s $=~ [here|@(@|\{([^{}]+)\})|]
where
phi mtch _ cap = case txt == "@@" of
True -> Just "@"
False -> Just $ fromMaybe txt $ lu ide
where
txt = capturedText cap
ide = MacroID $ capturedText $ capture c2 mtch
c2 = IsCaptureOrdinal $ CaptureOrdinal 2
\end{code}
\begin{code}
lift_phi :: Monad m
=> (Match a->Location->Capture a->Maybe a)
-> (Match a->Location->Capture a->m (Maybe a))
lift_phi phi_ = phi
where
phi caps' loc' cap' = return $ phi_ caps' loc' cap'
\end{code}
\begin{code}
parseTemplateE' :: ( Replace a
, RegexContext Regex a (Matches a)
, RegexMaker Regex CompOption ExecOption String
)
=> (a->String)
-> a
-> Match a
-> Location
-> Capture a
-> Maybe a
parseTemplateE' unpack tpl mtch _ _ =
Just $ replaceAllCaptures TOP phi $
tpl $=~ [here|\$(\$|[0-9]|\{([^{}]+)\})|]
where
phi t_mtch _ _ = case t_mtch !$? c2 of
Just cap -> case readMaybe stg of
Nothing -> this $ IsCaptureName $ CaptureName $ T.pack stg
Just cn -> this $ IsCaptureOrdinal $ CaptureOrdinal cn
where
stg = unpack $ capturedText cap
Nothing -> case s == "$" of
True -> Just t
False -> this $ IsCaptureOrdinal $ CaptureOrdinal $ read s
where
s = unpack t
t = capturedText $ capture c1 t_mtch
this cid = capturedText <$> mtch !$? cid
c1 = IsCaptureOrdinal $ CaptureOrdinal 1
c2 = IsCaptureOrdinal $ CaptureOrdinal 2
\end{code}
\begin{code}
fixpoint :: (Eq a) => (a->a) -> a -> a
fixpoint f = chk . iterate f
where
chk (x:x':_) | x==x' = x
chk xs = chk $ tail xs
\end{code}
\begin{code}
($=~) :: ( RegexContext Regex source target
, RegexMaker Regex CompOption ExecOption String
)
=> source -> String -> target
($=~) = (=~)
\end{code}