/usr/lib/hugs/packages/Cabal/Distribution/ParseUtils.hs is in libhugs-cabal-bundled 98.200609.21-5.3.
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-- |
-- Module : Distribution.ParseUtils
-- Copyright : (c) The University of Glasgow 2004
--
-- Maintainer : libraries@haskell.org
-- Stability : alpha
-- Portability : portable
--
-- Utilities for parsing PackageDescription and InstalledPackageInfo.
{- All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following
disclaimer in the documentation and/or other materials provided
with the distribution.
* Neither the name of the University nor the names of other
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. -}
-- This module is meant to be local-only to Distribution...
-- #hide
module Distribution.ParseUtils (
LineNo, PError(..), PWarning,
locatedErrorMsg, showError, syntaxError, warning,
runP, ParseResult(..),
StanzaField(..), splitStanzas, Stanza, singleStanza,
parseFilePathQ, parseTokenQ,
parseModuleNameQ, parseDependency, parseOptVersion,
parsePackageNameQ, parseVersionRangeQ,
parseTestedWithQ, parseLicenseQ, parseExtensionQ, parseCommaList, parseOptCommaList,
showFilePath, showToken, showTestedWith, showDependency, showFreeText,
simpleField, listField, commaListField, optsField,
parseReadS, parseQuoted,
) where
import Text.PrettyPrint.HughesPJ
import Distribution.Compiler (CompilerFlavor)
import Distribution.License
import Distribution.Version
import Distribution.Package ( parsePackageName )
import Distribution.Compat.ReadP as ReadP hiding (get)
import Distribution.Compat.FilePath (platformPath)
import Control.Monad (liftM)
import Data.Char
import Language.Haskell.Extension (Extension)
-- -----------------------------------------------------------------------------
type LineNo = Int
data PError = AmbigousParse String LineNo
| NoParse String LineNo
| FromString String (Maybe LineNo)
deriving Show
type PWarning = String
data ParseResult a = ParseFailed PError | ParseOk [PWarning] a
deriving Show
instance Monad ParseResult where
return x = ParseOk [] x
ParseFailed err >>= _ = ParseFailed err
ParseOk ws x >>= f = case f x of
ParseFailed err -> ParseFailed err
ParseOk ws' x' -> ParseOk (ws'++ws) x'
fail s = ParseFailed (FromString s Nothing)
runP :: LineNo -> String -> ReadP a a -> String -> ParseResult a
runP lineNo field p s =
case [ x | (x,"") <- results ] of
[a] -> ParseOk [] a
[] -> case [ x | (x,ys) <- results, all isSpace ys ] of
[a] -> ParseOk [] a
[] -> ParseFailed (NoParse field lineNo)
_ -> ParseFailed (AmbigousParse field lineNo)
_ -> ParseFailed (AmbigousParse field lineNo)
where results = readP_to_S p s
-- TODO: deprecated
showError :: PError -> String
showError e =
case locatedErrorMsg e of
(Just n, s) -> "Line "++show n++": " ++ s
(Nothing, s) -> s
locatedErrorMsg :: PError -> (Maybe LineNo, String)
locatedErrorMsg (AmbigousParse f n) = (Just n, "Ambigous parse in field '"++f++"'")
locatedErrorMsg (NoParse f n) = (Just n, "Parse of field '"++f++"' failed: ")
locatedErrorMsg (FromString s n) = (n, s)
syntaxError :: LineNo -> String -> ParseResult a
syntaxError n s = ParseFailed $ FromString s (Just n)
warning :: String -> ParseResult ()
warning s = ParseOk [s] ()
data StanzaField a
= StanzaField
{ fieldName :: String
, fieldGet :: a -> Doc
, fieldSet :: LineNo -> String -> a -> ParseResult a
}
simpleField :: String -> (a -> Doc) -> (ReadP a a) -> (b -> a) -> (a -> b -> b) -> StanzaField b
simpleField name showF readF get set = StanzaField name
(\st -> showF (get st))
(\lineNo val st -> do
x <- runP lineNo name readF val
return (set x st))
commaListField :: String -> (a -> Doc) -> (ReadP [a] a) -> (b -> [a]) -> ([a] -> b -> b) -> StanzaField b
commaListField name showF readF get set = StanzaField name
(\st -> fsep (punctuate comma (map showF (get st))))
(\lineNo val st -> do
xs <- runP lineNo name (parseCommaList readF) val
return (set xs st))
listField :: String -> (a -> Doc) -> (ReadP [a] a) -> (b -> [a]) -> ([a] -> b -> b) -> StanzaField b
listField name showF readF get set = StanzaField name
(\st -> fsep (map showF (get st)))
(\lineNo val st -> do
xs <- runP lineNo name (parseOptCommaList readF) val
return (set xs st))
optsField :: String -> CompilerFlavor -> (b -> [(CompilerFlavor,[String])]) -> ([(CompilerFlavor,[String])] -> b -> b) -> StanzaField b
optsField name flavor get set = StanzaField name
(\st -> case lookup flavor (get st) of
Just args -> hsep (map text args)
Nothing -> empty)
(\_ val st ->
let
old_val = get st
old_args = case lookup flavor old_val of
Just args -> args
Nothing -> []
val' = filter (\(f,_) -> f/=flavor) old_val
in return (set ((flavor,words val++old_args) : val') st))
type Stanza = [(LineNo,String,String)]
-- |Split a string into blank line-separated stanzas of
-- "Field: value" groups
splitStanzas :: String -> ParseResult [Stanza]
splitStanzas = mapM mkStanza . map merge . groupStanzas . filter validLine . zip [1..] . lines
where validLine (_,s) = case dropWhile isSpace s of
'-':'-':_ -> False -- Comment
_ -> True
groupStanzas :: [(Int,String)] -> [[(Int,String)]]
groupStanzas [] = []
groupStanzas xs = let (ys,zs) = break allSpaces xs
in ys : groupStanzas (dropWhile allSpaces zs)
allSpaces :: (a, String) -> Bool
allSpaces (_,xs) = all isSpace xs
-- |Split a file into "Field: value" groups, but blank lines have no
-- significance, unlike 'splitStanzas'. A field value may span over blank
-- lines.
singleStanza :: String -> ParseResult Stanza
singleStanza = mkStanza . merge . filter validLine . zip [1..] . lines
where validLine (_,s) = case dropWhile isSpace s of
'-':'-':_ -> False -- Comment
[] -> False -- blank line
_ -> True
merge :: [(a, [Char])] -> [(a, [Char])]
merge ((n,x):(_,c:s):ys)
| c == ' ' || c == '\t' = case dropWhile isSpace s of
('.':s') -> merge ((n,x++"\n"++s'):ys)
s' -> merge ((n,x++"\n"++s'):ys)
merge ((n,x):ys) = (n,x) : merge ys
merge [] = []
mkStanza :: [(Int,String)] -> ParseResult Stanza
mkStanza [] = return []
mkStanza ((n,xs):ys) =
case break (==':') xs of
(fld', ':':val) -> do
let fld'' = map toLower fld'
fld <- case () of
_ | fld'' == "hs-source-dir"
-> do warning "The field \"hs-source-dir\" is deprecated, please use hs-source-dirs."
return "hs-source-dirs"
| fld'' == "other-files"
-> do warning "The field \"other-files\" is deprecated, please use extra-source-files."
return "extra-source-files"
| otherwise -> return fld''
ss <- mkStanza ys
checkDuplField fld ss
return ((n, fld, dropWhile isSpace val):ss)
(_, _) -> syntaxError n "Invalid syntax (no colon after field name)"
where
checkDuplField _ [] = return ()
checkDuplField fld ((n',fld',_):xs')
| fld' == fld = syntaxError (max n n') $ "The field "++fld++" was already defined on line " ++ show (min n n')
| otherwise = checkDuplField fld xs'
-- |parse a module name
parseModuleNameQ :: ReadP r String
parseModuleNameQ = parseQuoted modu <++ modu
where modu = do
c <- satisfy isUpper
cs <- munch (\x -> isAlphaNum x || x `elem` "_'.")
return (c:cs)
parseFilePathQ :: ReadP r FilePath
parseFilePathQ = liftM platformPath parseTokenQ
parseReadS :: Read a => ReadP r a
parseReadS = readS_to_P reads
parseDependency :: ReadP r Dependency
parseDependency = do name <- parsePackageNameQ
skipSpaces
ver <- parseVersionRangeQ <++ return AnyVersion
skipSpaces
return $ Dependency name ver
parsePackageNameQ :: ReadP r String
parsePackageNameQ = parseQuoted parsePackageName <++ parsePackageName
parseVersionRangeQ :: ReadP r VersionRange
parseVersionRangeQ = parseQuoted parseVersionRange <++ parseVersionRange
parseOptVersion :: ReadP r Version
parseOptVersion = parseQuoted ver <++ ver
where ver = parseVersion <++ return noVersion
noVersion = Version{ versionBranch=[], versionTags=[] }
parseTestedWithQ :: ReadP r (CompilerFlavor,VersionRange)
parseTestedWithQ = parseQuoted tw <++ tw
where tw = do compiler <- parseReadS
skipSpaces
version <- parseVersionRange <++ return AnyVersion
skipSpaces
return (compiler,version)
parseLicenseQ :: ReadP r License
parseLicenseQ = parseQuoted parseReadS <++ parseReadS
-- urgh, we can't define optQuotes :: ReadP r a -> ReadP r a
-- because the "compat" version of ReadP isn't quite powerful enough. In
-- particular, the type of <++ is ReadP r r -> ReadP r a -> ReadP r a
-- Hence the trick above to make 'lic' polymorphic.
parseExtensionQ :: ReadP r Extension
parseExtensionQ = parseQuoted parseReadS <++ parseReadS
parseTokenQ :: ReadP r String
parseTokenQ = parseReadS <++ munch1 (\x -> not (isSpace x) && x /= ',')
parseCommaList :: ReadP r a -- ^The parser for the stuff between commas
-> ReadP r [a]
parseCommaList p = sepBy p separator
where separator = skipSpaces >> ReadP.char ',' >> skipSpaces
parseOptCommaList :: ReadP r a -- ^The parser for the stuff between commas
-> ReadP r [a]
parseOptCommaList p = sepBy p separator
where separator = skipSpaces >> optional (ReadP.char ',') >> skipSpaces
parseQuoted :: ReadP r a -> ReadP r a
parseQuoted p = between (ReadP.char '"') (ReadP.char '"') p
-- --------------------------------------------
-- ** Pretty printing
showFilePath :: FilePath -> Doc
showFilePath = showToken
showToken :: String -> Doc
showToken str
| not (any dodgy str) &&
not (null str) = text str
| otherwise = text (show str)
where dodgy c = isSpace c || c == ','
showTestedWith :: (CompilerFlavor,VersionRange) -> Doc
showTestedWith (compiler,version) = text (show compiler ++ " " ++ showVersionRange version)
showDependency :: Dependency -> Doc
showDependency (Dependency name ver) = text name <+> text (showVersionRange ver)
-- | Pretty-print free-format text, ensuring that it is vertically aligned,
-- and with blank lines replaced by dots for correct re-parsing.
showFreeText :: String -> Doc
showFreeText s = vcat [text (if null l then "." else l) | l <- lines s]
|