-- Hoogle documentation, generated by Haddock
-- See Hoogle, http://www.haskell.org/hoogle/


-- | Support for reading and writing UTF8 Strings
--   
--   A UTF8 layer for IO and Strings. The utf8-string package provides
--   operations for encoding UTF8 strings to Word8 lists and back, and for
--   reading and writing UTF8 without truncation.
@package utf8-string
@version 0.3.7


-- | Support for encoding UTF8 Strings to and from <tt>[Word8]</tt>
module Codec.Binary.UTF8.String

-- | Encode a Haskell String to a list of Word8 values, in UTF8 format.
encode :: String -> [Word8]

-- | Decode a UTF8 string packed into a list of Word8 values, directly to
--   String
decode :: [Word8] -> String

-- | Encode a string using <a>encode</a> and store the result in a
--   <a>String</a>.
encodeString :: String -> String

-- | Decode a string using <a>decode</a> using a <a>String</a> as input. |
--   This is not safe but it is necessary if UTF-8 encoded text | has been
--   loaded into a <a>String</a> prior to being decoded.
decodeString :: String -> String

-- | Encode a single Haskell Char to a list of Word8 values, in UTF8
--   format.
encodeChar :: Char -> [Word8]

-- | <tt>isUTF8Encoded str</tt> tries to recognize input string as being in
--   UTF-8 form.
isUTF8Encoded :: String -> Bool

-- | <tt>utf8Encode str</tt> is a convenience function; checks to see if
--   <tt>str</tt> isn't UTF-8 encoded before doing so. Sometimes useful,
--   but you are better off keeping track of the encoding so as to avoid
--   the cost of checking.
utf8Encode :: String -> String


module Codec.Binary.UTF8.Generic
class (Num s, Ord s) => UTF8Bytes b s | b -> s
bsplit :: UTF8Bytes b s => s -> b -> (b, b)
bdrop :: UTF8Bytes b s => s -> b -> b
buncons :: UTF8Bytes b s => b -> Maybe (Word8, b)
elemIndex :: UTF8Bytes b s => Word8 -> b -> Maybe s
empty :: UTF8Bytes b s => b
null :: UTF8Bytes b s => b -> Bool
pack :: UTF8Bytes b s => [Word8] -> b
tail :: UTF8Bytes b s => b -> b

-- | Try to extract a character from a byte string. Returns <a>Nothing</a>
--   if there are no more bytes in the byte string. Otherwise, it returns a
--   decoded character and the number of bytes used in its representation.
--   Errors are replaced by character '\0xFFFD'.
decode :: UTF8Bytes b s => b -> Maybe (Char, s)

-- | This character is used to mark errors in a UTF8 encoded string.
replacement_char :: Char

-- | Get the first character of a byte string, if any. Malformed characters
--   are replaced by '\0xFFFD'.
uncons :: UTF8Bytes b s => b -> Maybe (Char, b)

-- | Split after a given number of characters. Negative values are treated
--   as if they are 0.
splitAt :: UTF8Bytes b s => s -> b -> (b, b)

-- | <tt>take n s</tt> returns the first <tt>n</tt> characters of
--   <tt>s</tt>. If <tt>s</tt> has less than <tt>n</tt> characters, then we
--   return the whole of <tt>s</tt>.
take :: UTF8Bytes b s => s -> b -> b

-- | <tt>drop n s</tt> returns the <tt>s</tt> without its first <tt>n</tt>
--   characters. If <tt>s</tt> has less than <tt>n</tt> characters, then we
--   return an empty string.
drop :: UTF8Bytes b s => s -> b -> b

-- | Split a string into two parts: the first is the longest prefix that
--   contains only characters that satisfy the predicate; the second part
--   is the rest of the string. Invalid characters are passed as '\0xFFFD'
--   to the predicate.
span :: UTF8Bytes b s => (Char -> Bool) -> b -> (b, b)

-- | Split a string into two parts: the first is the longest prefix that
--   contains only characters that do not satisfy the predicate; the second
--   part is the rest of the string. Invalid characters are passed as
--   '\0xFFFD' to the predicate.
break :: UTF8Bytes b s => (Char -> Bool) -> b -> (b, b)

-- | Converts a Haskell string into a UTF8 encoded bytestring.
fromString :: UTF8Bytes b s => String -> b

-- | Convert a UTF8 encoded bytestring into a Haskell string. Invalid
--   characters are replaced with '\xFFFD'.
toString :: UTF8Bytes b s => b -> String

-- | Traverse a bytestring (left biased). This function is strict in the
--   accumulator.
foldl :: UTF8Bytes b s => (a -> Char -> a) -> a -> b -> a

-- | Traverse a bytestring (right biased).
foldr :: UTF8Bytes b s => (Char -> a -> a) -> a -> b -> a

-- | Counts the number of characters encoded in the bytestring. Note that
--   this includes replacement characters.
length :: UTF8Bytes b s => b -> s

-- | Split a string into a list of lines. Lines are terminated by '\n' or
--   the end of the string. Empty lines may not be terminated by the end of
--   the string. See also 'lines\''.
lines :: UTF8Bytes b s => b -> [b]

-- | Split a string into a list of lines. Lines are terminated by '\n' or
--   the end of the string. Empty lines may not be terminated by the end of
--   the string. This function preserves the terminators. See also
--   <a>lines</a>.
lines' :: UTF8Bytes b s => b -> [b]
instance UTF8Bytes [Word8] Int
instance UTF8Bytes ByteString Int64
instance UTF8Bytes ByteString Int


module Data.String.UTF8

-- | The type of strings that are represented using the UTF8 encoding. The
--   parameter is the type of the container for the representation.
data UTF8 string
class (Num s, Ord s) => UTF8Bytes b s | b -> s

-- | Converts a Haskell string into a UTF8 encoded string. Complexity:
--   linear.
fromString :: UTF8Bytes string index => String -> UTF8 string

-- | Convert a UTF8 encoded string into a Haskell string. Invalid
--   characters are replaced by <tt>replacement_char</tt>. Complexity:
--   linear.
toString :: UTF8Bytes string index => UTF8 string -> String
fromRep :: string -> UTF8 string
toRep :: UTF8 string -> string

-- | This character is used to mark errors in a UTF8 encoded string.
replacement_char :: Char

-- | Get the first character of a byte string, if any. Invalid characters
--   are replaced by <tt>replacement_char</tt>.
uncons :: UTF8Bytes string index => UTF8 string -> Maybe (Char, UTF8 string)

-- | Split after a given number of characters. Negative values are treated
--   as if they are 0. See also <tt>bytesSplitAt</tt>.
splitAt :: UTF8Bytes string index => index -> UTF8 string -> (UTF8 string, UTF8 string)

-- | <tt>take n s</tt> returns the first <tt>n</tt> characters of
--   <tt>s</tt>. If <tt>s</tt> has less than <tt>n</tt> characters, then we
--   return the whole of <tt>s</tt>.
take :: UTF8Bytes string index => index -> UTF8 string -> UTF8 string

-- | <tt>drop n s</tt> returns the <tt>s</tt> without its first <tt>n</tt>
--   characters. If <tt>s</tt> has less than <tt>n</tt> characters, then we
--   return an empty string.
drop :: UTF8Bytes string index => index -> UTF8 string -> UTF8 string

-- | Split a string into two parts: the first is the longest prefix that
--   contains only characters that satisfy the predicate; the second part
--   is the rest of the string. Invalid characters are passed as '\0xFFFD'
--   to the predicate.
span :: UTF8Bytes string index => (Char -> Bool) -> UTF8 string -> (UTF8 string, UTF8 string)

-- | Split a string into two parts: the first is the longest prefix that
--   contains only characters that do not satisfy the predicate; the second
--   part is the rest of the string. Invalid characters are passed as
--   <tt>replacement_char</tt> to the predicate.
break :: UTF8Bytes string index => (Char -> Bool) -> UTF8 string -> (UTF8 string, UTF8 string)

-- | Traverse a bytestring (left biased). This function is strict in the
--   accumulator.
foldl :: UTF8Bytes string index => (a -> Char -> a) -> a -> UTF8 string -> a

-- | Traverse a bytestring (right biased).
foldr :: UTF8Bytes string index => (Char -> a -> a) -> a -> UTF8 string -> a

-- | Counts the number of characters encoded in the bytestring. Note that
--   this includes replacement characters. The function is linear in the
--   number of bytes in the representation.
length :: UTF8Bytes string index => UTF8 string -> index

-- | Split a string into a list of lines. Lines are terminated by '\n' or
--   the end of the string. Empty lines may not be terminated by the end of
--   the string. See also 'lines\''.
lines :: UTF8Bytes string index => UTF8 string -> [UTF8 string]

-- | Split a string into a list of lines. Lines are terminated by '\n' or
--   the end of the string. Empty lines may not be terminated by the end of
--   the string. This function preserves the terminators. See also
--   <a>lines</a>.
lines' :: UTF8Bytes string index => UTF8 string -> [UTF8 string]

-- | Checks if there are no more bytes in the underlying representation.
null :: UTF8Bytes string index => UTF8 string -> Bool

-- | Extract the first character for the underlying representation, if one
--   is available. It also returns the number of bytes used in the
--   representation of the character. See also <a>uncons</a>,
--   <tt>dropBytes</tt>.
decode :: UTF8Bytes string index => UTF8 string -> Maybe (Char, index)

-- | Split after a given number of bytes in the underlying representation.
--   See also <a>splitAt</a>.
byteSplitAt :: UTF8Bytes string index => index -> UTF8 string -> (UTF8 string, UTF8 string)

-- | Take only the given number of bytes from the underlying
--   representation. See also <a>take</a>.
byteTake :: UTF8Bytes string index => index -> UTF8 string -> UTF8 string

-- | Drop the given number of bytes from the underlying representation. See
--   also <a>drop</a>.
byteDrop :: UTF8Bytes string index => index -> UTF8 string -> UTF8 string
instance Eq string => Eq (UTF8 string)
instance Ord string => Ord (UTF8 string)
instance UTF8Bytes string index => Show (UTF8 string)


-- | String IO preserving UTF8 encoding.
module System.IO.UTF8

-- | The <a>print</a> function outputs a value of any printable type to the
--   standard output device. This function differs from the System.IO.print
--   in that it preserves any UTF8 encoding of the shown value.
print :: Show a => a -> IO ()

-- | Write a UTF8 string to the standard output device
putStr :: String -> IO ()

-- | The same as <a>putStr</a>, but adds a newline character.
putStrLn :: String -> IO ()

-- | Read a UTF8 line from the standard input device
getLine :: IO String

-- | The <a>readLn</a> function combines <a>getLine</a> and
--   <tt>readIO</tt>, preserving UTF8
readLn :: Read a => IO a
openBinaryFile :: FilePath -> IOMode -> IO Handle
withBinaryFile :: FilePath -> IOMode -> (Handle -> IO a) -> IO a

-- | The <a>readFile</a> function reads a file and returns the contents of
--   the file as a UTF8 string. The file is read lazily, on demand, as with
--   <a>getContents</a>.
readFile :: FilePath -> IO String

-- | The computation <a>writeFile</a> <tt>file str</tt> function writes the
--   UTF8 string <tt>str</tt>, to the file <tt>file</tt>.
writeFile :: FilePath -> String -> IO ()

-- | The computation <a>appendFile</a> <tt>file str</tt> function appends
--   the UTF8 string <tt>str</tt>, to the file <tt>file</tt>.
appendFile :: FilePath -> String -> IO ()
interact :: (String -> String) -> IO ()

-- | Lazily read stdin as a UTF8 string.
getContents :: IO String

-- | Read a UTF8 line from a Handle
hGetLine :: Handle -> IO String

-- | Lazily read a UTF8 string from a Handle
hGetContents :: Handle -> IO String

-- | Write a UTF8 string to a Handle.
hPutStr :: Handle -> String -> IO ()

-- | Write a UTF8 string to a Handle, appending a newline.
hPutStrLn :: Handle -> String -> IO ()


-- | Support for UTF-8 based environment manipulation
module System.Environment.UTF8
getArgs :: IO [String]
getProgName :: IO String
getEnv :: String -> IO String
withArgs :: [String] -> IO a -> IO a
withProgName :: String -> IO a -> IO a
getEnvironment :: IO [(String, String)]


module Data.ByteString.UTF8

-- | A space-efficient representation of a Word8 vector, supporting many
--   efficient operations. A <a>ByteString</a> contains 8-bit characters
--   only.
--   
--   Instances of Eq, Ord, Read, Show, Data, Typeable
data ByteString :: *

-- | Try to extract a character from a byte string. Returns <a>Nothing</a>
--   if there are no more bytes in the byte string. Otherwise, it returns a
--   decoded character and the number of bytes used in its representation.
--   Errors are replaced by character '\0xFFFD'.
decode :: ByteString -> Maybe (Char, Int)

-- | This character is used to mark errors in a UTF8 encoded string.
replacement_char :: Char

-- | Get the first character of a byte string, if any. Malformed characters
--   are replaced by '\0xFFFD'.
uncons :: ByteString -> Maybe (Char, ByteString)

-- | Split after a given number of characters. Negative values are treated
--   as if they are 0.
splitAt :: Int -> ByteString -> (ByteString, ByteString)

-- | <tt>take n s</tt> returns the first <tt>n</tt> characters of
--   <tt>s</tt>. If <tt>s</tt> has less than <tt>n</tt> characters, then we
--   return the whole of <tt>s</tt>.
take :: Int -> ByteString -> ByteString

-- | <tt>drop n s</tt> returns the <tt>s</tt> without its first <tt>n</tt>
--   characters. If <tt>s</tt> has less than <tt>n</tt> characters, then we
--   return an empty string.
drop :: Int -> ByteString -> ByteString

-- | Split a string into two parts: the first is the longest prefix that
--   contains only characters that satisfy the predicate; the second part
--   is the rest of the string. Invalid characters are passed as '\0xFFFD'
--   to the predicate.
span :: (Char -> Bool) -> ByteString -> (ByteString, ByteString)

-- | Split a string into two parts: the first is the longest prefix that
--   contains only characters that do not satisfy the predicate; the second
--   part is the rest of the string. Invalid characters are passed as
--   '\0xFFFD' to the predicate.
break :: (Char -> Bool) -> ByteString -> (ByteString, ByteString)

-- | Converts a Haskell string into a UTF8 encoded bytestring.
fromString :: String -> ByteString

-- | Convert a UTF8 encoded bytestring into a Haskell string. Invalid
--   characters are replaced with '\xFFFD'.
toString :: ByteString -> String

-- | Traverse a bytestring (left biased). This function is strict in the
--   accumulator.
foldl :: (a -> Char -> a) -> a -> ByteString -> a

-- | Traverse a bytestring (right biased).
foldr :: (Char -> a -> a) -> a -> ByteString -> a

-- | Counts the number of characters encoded in the bytestring. Note that
--   this includes replacement characters.
length :: ByteString -> Int

-- | Split a string into a list of lines. Lines are terminated by '\n' or
--   the end of the string. Empty lines may not be terminated by the end of
--   the string. See also 'lines\''.
lines :: ByteString -> [ByteString]

-- | Split a string into a list of lines. Lines are terminated by '\n' or
--   the end of the string. Empty lines may not be terminated by the end of
--   the string. This function preserves the terminators. See also
--   <a>lines</a>.
lines' :: ByteString -> [ByteString]


module Data.ByteString.Lazy.UTF8

-- | A space-efficient representation of a Word8 vector, supporting many
--   efficient operations. A <a>ByteString</a> contains 8-bit characters
--   only.
--   
--   Instances of Eq, Ord, Read, Show, Data, Typeable
data ByteString :: *

-- | Try to extract a character from a byte string. Returns <a>Nothing</a>
--   if there are no more bytes in the byte string. Otherwise, it returns a
--   decoded character and the number of bytes used in its representation.
--   Errors are replaced by character '\0xFFFD'.
decode :: ByteString -> Maybe (Char, Int64)

-- | This character is used to mark errors in a UTF8 encoded string.
replacement_char :: Char

-- | Get the first character of a byte string, if any. Malformed characters
--   are replaced by '\0xFFFD'.
uncons :: ByteString -> Maybe (Char, ByteString)

-- | Split after a given number of characters. Negative values are treated
--   as if they are 0.
splitAt :: Int64 -> ByteString -> (ByteString, ByteString)

-- | <tt>take n s</tt> returns the first <tt>n</tt> characters of
--   <tt>s</tt>. If <tt>s</tt> has less than <tt>n</tt> characters, then we
--   return the whole of <tt>s</tt>.
take :: Int64 -> ByteString -> ByteString

-- | <tt>drop n s</tt> returns the <tt>s</tt> without its first <tt>n</tt>
--   characters. If <tt>s</tt> has less than <tt>n</tt> characters, then we
--   return an empty string.
drop :: Int64 -> ByteString -> ByteString

-- | Split a string into two parts: the first is the longest prefix that
--   contains only characters that satisfy the predicate; the second part
--   is the rest of the string. Invalid characters are passed as '\0xFFFD'
--   to the predicate.
span :: (Char -> Bool) -> ByteString -> (ByteString, ByteString)

-- | Split a string into two parts: the first is the longest prefix that
--   contains only characters that do not satisfy the predicate; the second
--   part is the rest of the string. Invalid characters are passed as
--   '\0xFFFD' to the predicate.
break :: (Char -> Bool) -> ByteString -> (ByteString, ByteString)

-- | Converts a Haskell string into a UTF8 encoded bytestring.
fromString :: String -> ByteString

-- | Convert a UTF8 encoded bytestring into a Haskell string. Invalid
--   characters are replaced with '\xFFFD'.
toString :: ByteString -> String

-- | Traverse a bytestring (left biased). This function is strict in the
--   accumulator.
foldl :: (a -> Char -> a) -> a -> ByteString -> a

-- | Traverse a bytestring (right biased).
foldr :: (Char -> a -> a) -> a -> ByteString -> a

-- | Counts the number of characters encoded in the bytestring. Note that
--   this includes replacement characters.
length :: ByteString -> Int

-- | Split a string into a list of lines. Lines are terminated by '\n' or
--   the end of the string. Empty lines may not be terminated by the end of
--   the string. See also 'lines\''.
lines :: ByteString -> [ByteString]

-- | Split a string into a list of lines. Lines are terminated by '\n' or
--   the end of the string. Empty lines may not be terminated by the end of
--   the string. This function preserves the terminators. See also
--   <a>lines</a>.
lines' :: ByteString -> [ByteString]