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> Haskell Core Libraries (base package) Parent Contents Index Text.Read Portability portable Stability provisional Maintainer libraries@haskell.org Contents The Read class Haskell 98 functions New parsing functions Description The Text.Read library is the canonical library to import for Read-class facilities. It offers an extended and much improved Read class, which constitutes a proposed alternative to the Haskell98 Read. In particular, writing parsers is easier, and the parsers are much more efficient. Synopsis class Read a where readsPrec :: Int -> ReadS a readList :: ReadS [a] readPrec :: ReadPrec a readListPrec :: ReadPrec [a] type ReadS a = String -> [(a, String)] reads :: (Read a) => ReadS a read :: (Read a) => String -> a readParen :: Bool -> ReadS a -> ReadS a lex :: ReadS String module Text.ParserCombinators.ReadPrec data Lexeme = Char Char | String String | Punc String | Ident String | Symbol String | Int Integer | Rat Rational | EOF lexP :: ReadPrec Lexeme readListDefault :: (Read a) => ReadS [a] readListPrecDefault :: (Read a) => ReadPrec [a] The Read class class Read a where Methods readsPrec :: Int -> ReadS a readList :: ReadS [a] readPrec :: ReadPrec a readListPrec :: ReadPrec [a] Instances 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 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 StdGen 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. Haskell 98 functions reads :: (Read a) => ReadS a read :: (Read a) => String -> a readParen :: Bool -> ReadS a -> ReadS a lex :: ReadS String New parsing functions module Text.ParserCombinators.ReadPrec data Lexeme Constructors Char Char String String Punc String Ident String Symbol String Int Integer Rat Rational EOF Instances Read Lexeme lexP :: ReadPrec Lexeme Parse a single lexeme readListDefault :: (Read a) => ReadS [a] Use this to define the readList method, if you don't want a special case readListPrecDefault :: (Read a) => ReadPrec [a] Use this to define the readListPrec method, if you don't want a special case Produced by Haddock version 0.4