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Make osstr :: QuasiQuoter valid as a pattern #2

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Merged
merged 1 commit into from
Dec 2, 2023
Merged

Make osstr :: QuasiQuoter valid as a pattern #2

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21 changes: 13 additions & 8 deletions System/OsString/Internal.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,8 @@
{-# LANGUAGE UnliftedFFITypes #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TemplateHaskellQuotes #-}
{-# LANGUAGE ViewPatterns #-} -- needed to quote a view pattern

module System.OsString.Internal where

Expand Down Expand Up @@ -122,30 +124,33 @@ fromBytes = fmap OsString . PF.fromBytes

-- | QuasiQuote an 'OsString'. This accepts Unicode characters
-- and encodes as UTF-8 on unix and UTF-16 on windows.
-- If used as pattern, requires turning on the @ViewPatterns@ extension.
osstr :: QuasiQuoter
osstr =
QuasiQuoter
#if defined(mingw32_HOST_OS) || defined(__MINGW32__)
{ quoteExp = \s -> do
osp <- either (fail . show) (pure . OsString) . PF.encodeWith (mkUTF16le ErrorOnCodingFailure) $ s
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
[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
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
[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

Expand Down