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make osp :: QuasiQuoter valid as a pattern #210

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Dec 2, 2023
Merged

make osp :: QuasiQuoter valid as a pattern #210

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25 changes: 16 additions & 9 deletions System/OsPath/Internal.hs
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Original file line number Diff line number Diff line change
@@ -1,6 +1,8 @@
{-# LANGUAGE CPP #-}
{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE UnliftedFFITypes #-}
{-# LANGUAGE TemplateHaskellQuotes #-}
{-# LANGUAGE ViewPatterns #-} -- needed to quote a view pattern

module System.OsPath.Internal where

Expand Down Expand Up @@ -111,32 +113,37 @@ fromBytes = OS.fromBytes

-- | QuasiQuote an 'OsPath'. This accepts Unicode characters
-- and encodes as UTF-8 on unix and UTF-16LE on windows. Runs 'isValid'
-- on the input.
-- on the input. If used as a pattern, requires turning on the @ViewPatterns@
-- extension.
osp :: QuasiQuoter
osp = QuasiQuoter
#if defined(mingw32_HOST_OS) || defined(__MINGW32__)
{ quoteExp = \s -> do
osp' <- either (fail . show) (pure . OsString) . PF.encodeWith (mkUTF16le ErrorOnCodingFailure) $ s
when (not $ isValid osp') $ fail ("filepath not valid: " ++ show osp')
lift osp'
, quotePat = \_ ->
fail "illegal QuasiQuote (allowed as expression only, used as a pattern)"
, quotePat = \s -> do
osp' <- either (fail . show) (pure . OsString) . PF.encodeWith (mkUTF16le ErrorOnCodingFailure) $ s
when (not $ isValid osp') $ fail ("filepath not valid: " ++ show osp')
[p|((==) osp' -> True)|]
, quoteType = \_ ->
fail "illegal QuasiQuote (allowed as expression only, used as a type)"
fail "illegal QuasiQuote (allowed as expression or pattern only, used as a type)"
, quoteDec = \_ ->
fail "illegal QuasiQuote (allowed as expression only, used as a declaration)"
fail "illegal QuasiQuote (allowed as expression or pattern only, used as a declaration)"
}
#else
{ quoteExp = \s -> do
osp' <- either (fail . show) (pure . OsString) . PF.encodeWith (mkUTF8 ErrorOnCodingFailure) $ s
when (not $ isValid osp') $ fail ("filepath not valid: " ++ show osp')
lift osp'
, quotePat = \_ ->
fail "illegal QuasiQuote (allowed as expression only, used as a pattern)"
, quotePat = \s -> do
osp' <- either (fail . show) (pure . OsString) . PF.encodeWith (mkUTF8 ErrorOnCodingFailure) $ s
when (not $ isValid osp') $ fail ("filepath not valid: " ++ show osp')
[p|((==) osp' -> True)|]
, quoteType = \_ ->
fail "illegal QuasiQuote (allowed as expression only, used as a type)"
fail "illegal QuasiQuote (allowed as expression or pattern only, used as a type)"
, quoteDec = \_ ->
fail "illegal QuasiQuote (allowed as expression only, used as a declaration)"
fail "illegal QuasiQuote (allowed as expression or pattern only, used as a declaration)"
}
#endif

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