Safe Haskell	None
Language	Haskell2010

Data.BufferBuilder.Utf8

Contents

The Utf8Builder Monad
Text encoding
ASCII-7
Printing numbers
Escaped JSON
Unsafe append operations

Description

A library for efficiently building up a buffer of UTF-8-encoded text. If only safe functions are used, the resulting ByteString is guaranteed to be valid UTF-8.

To run a sequence of Utf8Builder actions and retrieve the resulting buffer, use runUtf8Builder.

In special situations, for maximum performance, unsafe functions are also provided. The unsafe functions do not guarantee the buffer is correct UTF-8.

This module is built on top of Data.BufferBuilder.

Synopsis

The Utf8Builder Monad

data Utf8Builder a Source #

Instances

Monad Utf8Builder Source #
Methods (>>=) :: Utf8Builder a -> (a -> Utf8Builder b) -> Utf8Builder b # (>>) :: Utf8Builder a -> Utf8Builder b -> Utf8Builder b # return :: a -> Utf8Builder a # fail :: String -> Utf8Builder a #
Functor Utf8Builder Source #
Methods fmap :: (a -> b) -> Utf8Builder a -> Utf8Builder b # (<$) :: a -> Utf8Builder b -> Utf8Builder a #
Applicative Utf8Builder Source #
Methods pure :: a -> Utf8Builder a # (<>) :: Utf8Builder (a -> b) -> Utf8Builder a -> Utf8Builder b # (>) :: Utf8Builder a -> Utf8Builder b -> Utf8Builder b # (<*) :: Utf8Builder a -> Utf8Builder b -> Utf8Builder a #

runUtf8Builder :: Utf8Builder () -> ByteString Source #

Run a sequence of Utf8Builder actions and extracting the resulting buffer as a ByteString.

Text encoding

appendText :: Text -> Utf8Builder () Source #

Encodes the given Text in UTF-8, appending it to the buffer.

appendString :: String -> Utf8Builder () Source #

Encodes the given String in UTF-8, appending it to the buffer.

appendChar :: Char -> Utf8Builder () Source #

Encodes a single Char in UTF-8, appending it to the buffer.

ASCII-7

appendByte7 :: Word8 -> Utf8Builder () Source #

Appends the bottom 7 bits of a byte to the buffer.

appendChar7 :: Char -> Utf8Builder () Source #

Appends the bottom 7 bits of a Char to the buffer.

appendBS7 :: ByteString -> Utf8Builder () Source #

Appends the given ByteString to the buffer, taking the bottom 7 bits of each byte.

appendLiteral7 :: Addr# -> Utf8Builder () Source #

Appends the zero-terminated byte string at the given address to the buffer, taking the bottom 7 bits of each byte.

Printing numbers

appendDecimalSignedInt :: Int -> Utf8Builder () Source #

appendDecimalDouble :: Double -> Utf8Builder () Source #

Escaped JSON

appendEscapedJson :: ByteString -> Utf8Builder () Source #

appendEscapedJsonLiteral :: Addr# -> Utf8Builder () Source #

appendEscapedJsonText :: Text -> Utf8Builder () Source #

Unsafe append operations

unsafeAppendByte :: Word8 -> Utf8Builder () Source #

Directly append a byte into the UTF-8 code stream. Incorrect use of this function can result in invalid UTF-8.

unsafeAppendChar8 :: Char -> Utf8Builder () Source #

Directly append the bottom 8 bits of the given character to the UTF-8 code stream. Incorrect use of this function can result in invalid UTF-8.

unsafeAppendLiteral :: Addr# -> Utf8Builder () Source #

Directly append the zero-terminated byte sequence pointed to by the given address. Be careful that the referenced byte sequence contains valid UTF-8.

unsafeAppendLiteralN :: Int -> Addr# -> Utf8Builder () Source #

Directly append the given byte sequence pointed to by the given address. Be careful that the referenced byte sequence contains valid UTF-8.

WARNING: passing an incorrect length value is likely to cause an access violation or worse.

unsafeAppendBS :: ByteString -> Utf8Builder () Source #

Directly append the given ByteString to the output buffer. Be careful that the referenced ByteString contains valid UTF-8.