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| GHC.Read | | Portability | non-portable (GHC Extensions) | | Stability | internal | | Maintainer | cvs-ghc@haskell.org |
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| Description |
| The Read class and instances for basic data types.
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| Synopsis |
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| Documentation |
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| class Read a where |
| | Methods | | readsPrec :: Int -> ReadS a | | | readList :: ReadS [a] | | | readPrec :: ReadPrec a | | Proposed replacement for readsPrec using new-style parsers (GHC only). | | | readListPrec :: ReadPrec [a] | | Proposed replacement for readList using new-style parsers (GHC only). |
| | | Instances | | (RealFloat a, Read a) => Read (Complex a) | | Read CChar | | Read CSChar | | Read CUChar | | Read CShort | | Read CUShort | | Read CInt | | Read CUInt | | Read CLong | | Read CULong | | Read CLLong | | Read CULLong | | Read CFloat | | Read CDouble | | Read CLDouble | | Read CPtrdiff | | Read CSize | | Read CWchar | | Read CSigAtomic | | Read CClock | | Read CTime | | Read SeekMode | | Read BufferMode | | Read ExitCode | | Read IOMode | | Read Int8 | | Read Int16 | | Read Int32 | | Read Int64 | | Read Char | | Read Bool | | Read Ordering | | Read a => Read (Maybe a) | | (Read a, Read b) => Read (Either a b) | | Read a => Read [a] | | (Ix a, Read a, Read b) => Read (Array a b) | | Read Lexeme | | Read Int | | Read Integer | | Read Float | | Read Double | | (Integral a, Read a) => Read (Ratio a) | | Read () | | (Read a, Read b) => Read (a, b) | | (Read a, Read b, Read c) => Read (a, b, c) | | (Read a, Read b, Read c, Read d) => Read (a, b, c, d) | | (Read a, Read b, Read c, Read d, Read e) => Read (a, b, c, d, e) | | Read Word | | Read Word8 | | Read Word16 | | Read Word32 | | Read Word64 | | Read Permissions | | Read CDev | | Read CIno | | Read CMode | | Read COff | | Read CPid | | Read CSsize | | Read CGid | | Read CNlink | | Read CUid | | Read CCc | | Read CSpeed | | Read CTcflag | | Read CRLim | | Read Fd | | Read StdGen | | Read Month | | Read Day | | Read CalendarTime | | Read TimeDiff |
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| type ReadS a = String -> [(a, String)] |
| A parser for a type a, represented as a function that takes a
String and returns a list of possible parses (a,String) pairs. |
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| reads :: Read a => ReadS a |
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| readp :: Read a => ReadP a |
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| readEither :: Read a => String -> Either String a |
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| read :: Read a => String -> a |
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| lex :: ReadS String |
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| lexLitChar :: ReadS String |
Read a string representation of a character, using Haskell
source-language escape conventions. For example:
lexLitChar "\\nHello" = [("\\n", "Hello")]
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| readLitChar :: ReadS Char |
Read a string representation of a character, using Haskell
source-language escape conventions, and convert it to the character
that it encodes. For example:
readLitChar "\\nHello" = [('\n', "Hello")]
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| lexDigits :: ReadS String |
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| lexP :: ReadPrec Lexeme |
| Parse a single lexeme |
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| paren :: ReadPrec a -> ReadPrec a |
| (paren p) parses "(P0)"
where p parses "P0" in precedence context zero |
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| parens :: ReadPrec a -> ReadPrec a |
| (parens p) parses "P", "(P0)", "((P0))", etc,
where p parses "P" in the current precedence context
parses "P0" in precedence context zero |
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| list :: ReadPrec a -> ReadPrec [a] |
| (list p) parses a list of things parsed by p,
using the usual square-bracket syntax. |
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| choose :: [(String, ReadPrec a)] -> ReadPrec a |
| Parse the specified lexeme and continue as specified.
Esp useful for nullary constructors; e.g.
choose [("A", return A), ("B", return B)] |
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| readListDefault :: Read a => ReadS [a] |
| Use this to define the readList method, if you don't want a special
case (GHC only; for other systems the default suffices). |
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| readListPrecDefault :: Read a => ReadPrec [a] |
| Use this to define the readListPrec method, if you
don't want a special case (GHC only). |
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| readParen :: Bool -> ReadS a -> ReadS a |
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| Produced by Haddock version 0.6 |
