Copyright	(c) 2009 2010 Bryan O'Sullivan
License	BSD-style
Maintainer	bos@serpentine.com
Portability	portable
Safe Haskell	Trustworthy
Language	Haskell2010

Data.Text.Lazy.Encoding

Contents

Decoding ByteStrings to Text
- Catchable failure
- Controllable error handling
Encoding Text to ByteStrings
Encoding Text using ByteString Builders

Description

Functions for converting lazy Text values to and from lazy ByteString, using several standard encodings.

To gain access to a much larger family of encodings, use the text-icu package.

Synopsis

decodeASCII :: ByteString -> Text
decodeLatin1 :: ByteString -> Text
decodeUtf8 :: ByteString -> Text
decodeUtf16LE :: ByteString -> Text
decodeUtf16BE :: ByteString -> Text
decodeUtf32LE :: ByteString -> Text
decodeUtf32BE :: ByteString -> Text
decodeUtf8' :: ByteString -> Either UnicodeException Text
decodeUtf8With :: OnDecodeError -> ByteString -> Text
decodeUtf16LEWith :: OnDecodeError -> ByteString -> Text
decodeUtf16BEWith :: OnDecodeError -> ByteString -> Text
decodeUtf32LEWith :: OnDecodeError -> ByteString -> Text
decodeUtf32BEWith :: OnDecodeError -> ByteString -> Text
encodeUtf8 :: Text -> ByteString
encodeUtf16LE :: Text -> ByteString
encodeUtf16BE :: Text -> ByteString
encodeUtf32LE :: Text -> ByteString
encodeUtf32BE :: Text -> ByteString
encodeUtf8Builder :: Text -> Builder
encodeUtf8BuilderEscaped :: BoundedPrim Word8 -> Text -> Builder

Decoding ByteStrings to Text

All of the single-parameter functions for decoding bytestrings encoded in one of the Unicode Transformation Formats (UTF) operate in a strict mode: each will throw an exception if given invalid input.

Each function has a variant, whose name is suffixed with -With, that gives greater control over the handling of decoding errors. For instance, decodeUtf8 will throw an exception, but decodeUtf8With allows the programmer to determine what to do on a decoding error.

decodeASCII :: ByteString -> Text Source #

Decode a ByteString containing 7-bit ASCII encoded text.

decodeLatin1 :: ByteString -> Text Source #

Decode a ByteString containing Latin-1 (aka ISO-8859-1) encoded text.

decodeUtf8 :: ByteString -> Text Source #

Decode a ByteString containing UTF-8 encoded text that is known to be valid.

If the input contains any invalid UTF-8 data, an exception will be thrown that cannot be caught in pure code. For more control over the handling of invalid data, use decodeUtf8' or decodeUtf8With.

decodeUtf16LE :: ByteString -> Text Source #

Decode text from little endian UTF-16 encoding.

If the input contains any invalid little endian UTF-16 data, an exception will be thrown. For more control over the handling of invalid data, use decodeUtf16LEWith.

decodeUtf16BE :: ByteString -> Text Source #

Decode text from big endian UTF-16 encoding.

If the input contains any invalid big endian UTF-16 data, an exception will be thrown. For more control over the handling of invalid data, use decodeUtf16BEWith.

decodeUtf32LE :: ByteString -> Text Source #

Decode text from little endian UTF-32 encoding.

If the input contains any invalid little endian UTF-32 data, an exception will be thrown. For more control over the handling of invalid data, use decodeUtf32LEWith.

decodeUtf32BE :: ByteString -> Text Source #

Decode text from big endian UTF-32 encoding.

If the input contains any invalid big endian UTF-32 data, an exception will be thrown. For more control over the handling of invalid data, use decodeUtf32BEWith.

Catchable failure

decodeUtf8' :: ByteString -> Either UnicodeException Text Source #

Decode a ByteString containing UTF-8 encoded text..

If the input contains any invalid UTF-8 data, the relevant exception will be returned, otherwise the decoded text.

Note: this function is not lazy, as it must decode its entire input before it can return a result. If you need lazy (streaming) decoding, use decodeUtf8With in lenient mode.